CN218585903U - Moving contact mechanism and direct-acting circuit breaker - Google Patents

Abstract

The utility model discloses a moving contact mechanism and direct action type circuit breaker relates to low-voltage apparatus technical field. The moving contact mechanism comprises a transmission part, a moving contact support and a moving contact, wherein the transmission part is arranged in the shell in a sliding mode, the moving contact support is arranged in the shell in a rotating mode, the moving contact is arranged on the moving contact support, the transmission part is movably connected with the moving contact support, the transmission part is driven to move relative to the shell, and the moving contact is driven by the moving contact support to rotate relative to the shell so as to be switched on and off with a static contact in the shell. The moving contact mechanism can simplify the whole structure, improve the response speed and enhance the reliability of products.

Description

Moving contact mechanism and direct-acting circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus technical field particularly, relates to a moving contact mechanism and direct action type circuit breaker.

Background

Along with the rapid development of social economy and urban construction, the living standard and the living standard of people are remarkably improved, and the electricity safety is more comprehensively known. In order to increase the safety of the electricity consumption, a circuit breaker is usually connected to the electricity consumption circuit. The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time.

At present, traditional bayonet circuit breaker of taking automatic divide-shut brake function adopts motor + gear reduction structure mostly, realizes the electrical operation through electronic control board control, wherein, divide-shut brake operating device transmission to adopt four-bar linkage between the moving contact mechanism, belongs to traditional mechanical type circuit breaker + motor reduction mechanism's technical scheme, and its overall structure is comparatively complicated, and manufacturing cost is higher, and response speed is not fast enough, leads to the product reliability high inadequately.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a moving contact mechanism and direct action type circuit breaker can simplify overall structure, improves response speed, reinforcing product reliability.

The embodiment of the utility model is realized like this:

the utility model discloses an aspect provides a moving contact mechanism, set up including sliding driving medium, rotation in the casing set up in moving contact support in the casing and set up in moving contact on the moving contact support, the driving medium with moving contact support swing joint, the driving medium is driven relatively the casing removes and passes through moving contact support drives the moving contact is relative the casing rotate with static contact divide-shut brake in the casing. The moving contact mechanism can simplify the whole structure, improve the response speed and enhance the reliability of products.

Optionally, the driving mechanism further comprises a linkage shaft, a connecting hole is formed in one side, close to the moving contact support, of the driving member, a waist-shaped hole is formed in the moving contact support, and the linkage shaft is arranged in the connecting hole and the waist-shaped hole in a penetrating mode so that the driving member is movably connected with the moving contact support.

Optionally, when the moving contact and the fixed contact are separated, the linkage shaft abuts against one side of the kidney-shaped hole, which is far away from the rotation center of the moving contact support; when the moving contact and the static contact are switched on, the linkage shaft is abutted against one side of the kidney-shaped hole close to the rotating center of the moving contact support.

Optionally, the driving member includes a connecting plate and two connecting lugs parallel to and spaced apart from each other on a side of the connecting plate close to the movable contact support, each connecting lug is provided with a connecting hole, the two connecting holes correspond to each other, the movable contact support is accommodated between the two connecting lugs in a limiting manner, and the linkage shaft sequentially penetrates through one connecting hole, the waist-shaped hole and the other connecting hole.

Optionally, the driving member further includes a first elastic member, the driving member further includes a guide post disposed on one side of the connecting plate close to the moving contact support, the first elastic member is sleeved on the guide post, one end of the first elastic member abuts against the driving member, the other end of the first elastic member abuts against the housing, and the first elastic member is used for providing a restoring force for the movement of the driving member relative to the moving contact support.

Optionally, the number of the first elastic element and the number of the guide posts are two, the first elastic element and the guide posts correspond to each other one by one, and the two guide posts are arranged in parallel and at intervals outside the two connecting lugs.

Optionally, the movable contact mechanism further comprises a main shaft, a mounting hole is further formed in the movable contact support, the main shaft penetrates through the mounting hole so that the movable contact support is rotatably connected with the shell, and a track line of the transmission piece moving relative to the shell and an extension line of the guide column are parallel to each other and are both located between the main shaft and the linkage shaft.

Optionally, the moving contact further includes a rotating shaft and a second elastic member, a rotating hole is formed in the moving contact, an assembling hole is further formed in the moving contact support, the rotating shaft penetrates through the rotating hole and the assembling hole, so that the moving contact is rotatably connected with the moving contact support, the second elastic member is sleeved on the rotating shaft, one end of the second elastic member abuts against the moving contact support, and the other end of the second elastic member abuts against the moving contact, so that the moving contact abuts against the moving contact support.

Optionally, the moving contact support is provided with two connecting pieces in parallel and at intervals, each connecting piece is provided with the assembling hole, the two assembling holes correspond to each other, the moving contact is accommodated between the two assembling holes in a limiting manner, and the rotating shaft sequentially penetrates through one assembling hole, the rotating hole and the other assembling hole.

The embodiment of the utility model provides a on the other hand provides a direct action type circuit breaker, including the casing, and set up in manual operation mechanism, electric operating mechanism, static contact and foretell moving contact mechanism in the casing, manual operation mechanism with the transmission of electric operating mechanism is connected, electric operating mechanism includes two-way magnetic retaining device, two-way magnetic retaining device's transmission shaft can drive moving contact mechanism's driving medium is relative the casing removes. The moving contact mechanism can simplify the whole structure, improve the response speed and enhance the reliability of products.

The utility model discloses beneficial effect includes:

the moving contact mechanism comprises a transmission part, a moving contact support and a moving contact, wherein the transmission part is arranged in the shell in a sliding mode, the moving contact support is arranged in the shell in a rotating mode, the moving contact is arranged on the moving contact support, the transmission part is movably connected with the moving contact support, the transmission part is driven to move relative to the shell, and the moving contact is driven by the moving contact support to rotate relative to the shell so as to be switched on and off with a static contact in the shell. The driving part is movably connected with the moving contact support, so that the linear motion of the driving part can be converted into the circular motion of the moving contact support, the moving contact support is driven to rotate relative to the shell by driving the driving part to move relative to the shell, and the moving contact and the fixed contact are synchronously driven to be separated (namely, opening) or contacted (namely, closing). Compared with the technical scheme that the traditional motor drives the gear, the gear drives the inner handle, the inner handle drives the four-bar mechanism, and the four-bar mechanism drives the moving contact, the moving contact mechanism can simplify the whole structure, improve the response speed and enhance the product reliability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a direct acting circuit breaker according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a movable contact mechanism provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a moving contact mechanism according to an embodiment of the present invention during opening;

fig. 4 is a schematic structural diagram of the moving contact mechanism provided in the embodiment of the present invention when switching on;

fig. 5 is a schematic structural diagram of a movable contact support and a movable contact according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a transmission member according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a movable contact support provided in an embodiment of the present invention.

Icon: 100-direct acting circuit breaker; 10-a housing; 20-a manual operating mechanism; 30-an electric operating mechanism; 40-a static contact; 50-moving contact mechanism; 51-a transmission member; 511-connecting plate; 512-connecting lugs; 512 a-connection hole; 513-guide posts; 514-top rod; 52-moving contact support; 521-kidney-shaped holes; 522-mounting holes; 523-connecting sheet; 523 a-Assembly hole; 53-moving contact; 54-linkage shaft; 55-a first elastic member; 56-main shaft; 57-rotating shaft; 58-a second elastic member; 60-a snap-action protection mechanism; 70-an arc extinguishing mechanism; 81-incoming line terminal; 82-outlet terminal; 90-an electronic control and human-computer interaction unit; 91-mechanism action monitor; 92-a contact position monitor; 921-flexible connecting lines; 93-circuit breaker status indicator.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

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 invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather 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 invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 7, an embodiment of the present invention provides a direct-acting circuit breaker 100, which includes a housing 10, and a manual operating mechanism 20, an electric operating mechanism 30, a fixed contact 40, and a movable contact mechanism 50 disposed in the housing 10, wherein the manual operating mechanism 20 is in transmission connection with the electric operating mechanism 30, the electric operating mechanism 30 includes a bidirectional magnetic retaining device, and a transmission shaft of the bidirectional magnetic retaining device can drive a transmission member 51 of the movable contact mechanism 50 to move relative to the housing 10. Generally, the direct acting circuit breaker 100 further includes an incoming terminal 81 for connecting the main circuit and the control signal, and an outgoing terminal 82 for connecting the user main circuit quickly, so that the direct acting circuit breaker 100 is connected to the electric circuit through the incoming terminal 81 and the outgoing terminal 82 for on-off control.

It should be noted that the manual operating mechanism 20 may include an operating handle, a linkage, a locking and unlocking member, an intermediate transmission member, a trip button, a return spring, a cam transmission member, and the like, so as to perform manual opening and closing and emergency tripping through the manual operating mechanism 20; the electric operating mechanism 30 can be set as a bidirectional magnetic holding device, and the direct-acting circuit breaker 100 can be further configured with a transient-action protection mechanism 60, a shunt detection system, an arc extinguishing mechanism 70 and the like, so that the moving contact 53 and the static contact 40 of the moving contact mechanism 50 can be rapidly switched on and off, and an arc generated when the moving contact 53 and the static contact 40 are switched off can be rapidly extinguished through the arc extinguishing mechanism 70; in addition, the direct-acting circuit breaker 100 may further include an electric control and human-machine interaction unit 90, so as to detect a current circuit breaker state (for example, detection is performed by the mechanism motion monitor 91 and/or the contact position monitor 92, and indication is performed by the circuit breaker state indicator 93) and receive a control signal (for example, remote control is active control, and overload protection is passive control) through the electric control and human-machine interaction unit 90, and when receiving a closing instruction, the electric control and human-machine interaction unit 90 triggers a closing motion of the bidirectional magnetic holding device; when the electronic control and human-computer interaction unit 90 receives a brake-separating or tripping command, the brake-separating action of the bidirectional magnetic holding device is triggered.

The above-mentioned each mechanism and main components, and those skilled in the art should be able to refer to the circuit breaker in the prior art and make reasonable selection and design according to the actual situation, and no specific limitation is made here, and the moving contact 53 and the static contact 40 of the moving contact mechanism 50 provided in the embodiment of the present application can rapidly open and close the switch through the bidirectional magnetic retention device, and can also perform tripping and opening protection through the snap protection mechanism 60 when the circuit breaker and the distribution line have overload or short-circuit fault. The following mainly describes the specific mechanism of the movable contact mechanism 50, and the manual operation and the electric operation in detail.

(I) concrete Structure

As shown in fig. 2 to 7, the movable contact mechanism 50 includes a transmission member 51 slidably disposed in the housing 10, a movable contact support 52 rotatably disposed in the housing 10, and a movable contact 53 disposed on the movable contact support 52, wherein the transmission member 51 is movably connected to the movable contact support 52, and the transmission member 51 is driven to move relative to the housing 10, and the movable contact 53 is driven by the movable contact support 52 to rotate relative to the housing 10 so as to be switched on and off with the fixed contact 40 in the housing 10. The transmission member 51 is movably connected to the movable contact support 52, so that the linear motion of the transmission member 51 can be converted into a circular motion of the movable contact support 52, and the transmission member 51 is driven to move relative to the housing 10, so as to drive the movable contact support 52 to rotate relative to the housing 10, and synchronously drive the movable contact 53 to be separated from (i.e., open) or contacted with (i.e., close) the stationary contact 40. Compared with the technical scheme that the traditional motor drives the gear, the gear drives the inner handle, the inner handle drives the four-bar mechanism, and the four-bar mechanism drives the moving contact 53, the moving contact mechanism 50 can simplify the whole structure, improve the response speed and enhance the product reliability.

As to the specific form of the movable connection between the transmission member 51 and the movable contact support 52, as shown in fig. 2 to fig. 7, in this embodiment, the movable contact mechanism 50 further includes a linkage shaft 54, a connection hole 512a is disposed on one side of the transmission member 51 close to the movable contact support 52, a kidney-shaped hole 521 is disposed on the movable contact support 52, and the linkage shaft 54 is inserted into the connection hole 512a and the kidney-shaped hole 521, so as to movably connect the transmission member 51 and the movable contact support 52. The linkage shaft 54 can rotate in the connection hole 512a and can also slide in the kidney-shaped hole 521, so that the track difference between the linear motion of the transmission element 51 and the circular motion of the movable contact support 52 is compensated through the kidney-shaped hole 521, thereby ensuring that the linear motion of the transmission element 51 can be smoothly converted into the circular motion of the movable contact support 52, and simplifying the overall structure.

Regarding the specific length of the kidney-shaped hole 521, for example, as shown in fig. 3, in the present embodiment, when the moving contact 53 is separated from the stationary contact 40, the linkage shaft 54 abuts against a side of the kidney-shaped hole 521 away from the rotation center of the moving contact bracket 52; as shown in fig. 4, in the present embodiment, when the movable contact 53 and the fixed contact 40 are closed, the linkage shaft 54 abuts against a side of the kidney-shaped hole 521 close to the rotation center of the movable contact support 52. The rotation of the moving contact support 52 can be limited by the mutual abutting between the kidney-shaped hole 521 and the linkage shaft 54, so that the rotation stroke of the moving contact support 52 is prevented from exceeding a preset range. Of course, in the actual production process, considering the manufacturing tolerance, the assembly tolerance, and the like, the actual length of the kidney-shaped hole 521 may be further increased, that is, when the moving contact 53 and the static contact 40 are opened or closed, the linkage shaft 54 only slides to a position of the kidney-shaped hole 521 near one end, and does not abut against the end of the kidney-shaped hole 521 correspondingly.

As to the specific structure of the transmission element 51, for example, as shown in fig. 2 and fig. 6, in the present embodiment, the transmission element 51 includes a connection plate 511 and two connection lugs 512 arranged in parallel and at an interval on one side of the connection plate 511 close to the movable contact support 52, each connection lug 512 is provided with a connection hole 512a, the two connection holes 512a correspond to each other, the movable contact support 52 is accommodated between the two connection lugs 512 in a limited manner, and the linkage shaft 54 sequentially penetrates through one connection hole 512a, the kidney-shaped hole 521 and the other connection hole 512 a. Compared with the technical scheme of one connecting lug 512, the technical scheme of two connecting lugs 512 provided in the embodiment of the present application can limit the axial movement of the moving contact support 52 along the linkage shaft 54 through two connecting lugs 512, thereby preventing the moving contact support 52 from shaking along the axial direction of the linkage shaft 54 and enhancing the reliability of the product.

Further, as shown in fig. 2 to 4 and 6, in this embodiment, the movable contact mechanism 50 further includes a first elastic element 55, the transmission element 51 further includes a guiding post 513 disposed on one side of the connecting plate 511 close to the movable contact support 52, the first elastic element 55 is sleeved on the guiding post 513 to provide a guiding function for deformation of the first elastic element 55 through the guiding post 513, one end of the first elastic element 55 abuts against the transmission element 51, and the other end abuts against the housing 10, the first elastic element 55 is configured to provide a resetting force for movement of the transmission element 51 relative to the housing 10, so that when the movable contact 53 is separated from the stationary contact 40, the transmission element 51 and the housing 10 can be quickly reset, and the response speed is increased. In addition, the transmission component 51 may further include a push rod 514 disposed on a side of the connection plate 511 away from the movable contact support 52, so as to contact or separate from a trip shaft of the instantaneous trip mechanism through the push rod 514, thereby implementing manual or electric switching on, switching off or switching off.

For example, as shown in fig. 6, in the present embodiment, the number of the first elastic members 55 and the number of the guide posts 513 are two, the first elastic members 55 and the guide posts 513 correspond to each other one by one, and the two guide posts 513 are disposed in parallel and spaced apart from each other outside the two engaging lugs 512. Compared with the technical scheme that the number of the first elastic element 55 and the number of the guide columns 513 are both one, the technical scheme that the number of the first elastic element 55 and the number of the guide columns 513 are both two provided in the embodiment of the present application can increase the elastic potential energy stored by the first elastic element 55 due to extrusion when the moving contact 53 and the static contact 40 are switched on, so that the elastic potential energy released by the first elastic element 55 due to extrusion and disappearance is increased when the moving contact 53 and the static contact 40 are switched off, further, the transmission element 51 and the moving contact support 52 can be reset more quickly, and the response speed is further increased.

As shown in fig. 2 to 5 and 7, in the present embodiment, the movable contact mechanism 50 further includes a main shaft 56, the movable contact support 52 is further provided with a mounting hole 522, and the main shaft 56 is inserted into the mounting hole 522 to rotatably connect the movable contact support 52 and the housing 10. It should be noted that the track line of the movement of the transmission member 51 relative to the housing 10 and the extension line of the guide post 513 should be parallel to each other (preferably coincide with each other), so that when the first elastic member 55 is sleeved on the guide post 513 and provides a guiding effect for the deformation of the first elastic member 55 through the guide post 513, the first elastic member 55 is convenient for providing a restoring force for the movement of the transmission member 51 relative to the housing 10, and in addition, the track line of the movement of the transmission member 51 relative to the housing 10 and the extension line of the guide post 513 should be located between the main shaft 56 and the linkage shaft 54 to ensure that the transmission member 51 can smoothly drive the movable contact support 52 to rotate relative to the housing 10, and conversely, if the track line of the movement of the transmission member 51 relative to the housing 10 and the connecting line of the main shaft 56 and the linkage shaft 54 coincide with each other, the linear movement of the transmission member 51 is difficult to be converted into the circular movement of the movable contact support 52.

As shown in fig. 2 to 5, in this embodiment, the movable contact mechanism 50 further includes a rotating shaft 57 and a second elastic member 58, the movable contact 53 is provided with a rotating hole, the movable contact support 52 is further provided with an assembling hole 523a, the rotating shaft 57 penetrates through the rotating hole and the assembling hole 523a to rotatably connect the movable contact 53 and the movable contact support 52, the second elastic member 58 is sleeved on the rotating shaft 57, one end of the second elastic member 58 abuts against the movable contact support 52, and the other end abuts against the movable contact 53, so that the movable contact 53 abuts against the movable contact support 52, and in a closing process, after the movable contact 53 and the fixed contact 40 are in contact, the movable contact 53 can further rotate towards a side close to the fixed contact 40 by a certain angle to form an over travel, and meanwhile, the second elastic member 58 can further deform to store energy.

As for a specific structure of the movable contact support 52, for example, as shown in fig. 7, in the present embodiment, two connecting sheets 523 are arranged in parallel and at intervals on the movable contact support 52, each connecting sheet 523 is provided with an assembling hole 523a, the two assembling holes 523a correspond to each other, the movable contact 53 is accommodated between the two assembling holes 523a in a limited manner, and the rotating shaft 57 sequentially penetrates through one assembling hole 523a, the rotating hole and the other assembling hole 523 a. Compared with the technical scheme of one connecting sheet 523, the technical scheme of two connecting sheets 523 provided in the embodiment of the present application can limit the axial movement of the moving contact 53 along the rotating shaft 57 through the two connecting sheets 523, thereby avoiding the moving contact 53 from shaking along the axial direction of the rotating shaft 57, and enhancing the reliability of the product.

(II) Manual operation

The manual operating mechanism 20 and the electric operating mechanism 30 (or the bidirectional magnetic holding device) are in a series transmission relationship, the manual operating mechanism 20 moves forward (i.e. in a closing direction close to the static contact 40) to drive a transmission shaft of the bidirectional magnetic holding device to move forward, so as to push the transmission member 51 to move forward, and under the action of the linkage shaft 54, the movable contact support 52, the movable contact 53, the rotating shaft 57 and the second elastic member 58 of the movable contact mechanism 50 form a whole, and the whole can rotate around the main shaft 56 to realize the closing and holding of the movable contact 53 and the static contact 40, i.e. the connection of the circuit breaker; the manual operating mechanism 20 moves backward (i.e. away from the opening direction of the static contact 40), and drives the transmission shaft of the bidirectional magnetic holding device to move backward together, and the movable contact support 52 and the movable contact 53 rotate under the action of the second elastic element 58 and the first elastic element 55, so as to separate and hold the movable contact 53 from the static contact 40, that is, to disconnect the circuit breaker.

When the moving contact 53 and the static contact 40 are closed, the magnetic holding force is provided by the closing magnetic circuit of the bidirectional magnetic holding device, and the contact pressure is provided by the second elastic element 58 in the moving contact mechanism 50, so that reliable connection is ensured; when the moving contact 53 is disconnected from the static contact 40, the closing magnetic circuit of the bidirectional magnetic holding device moves backwards due to manual pulling, so as to generate an air gap, further, the second elastic member 58 and the first elastic member 55 provide a counter force, so that the moving contact 53 is quickly separated from the static contact 40, meanwhile, the trip shaft moves backwards under the action of the ejector rod 514 of the transmission member 51, and the opening magnetic circuit of the bidirectional magnetic holding device provides a magnetic holding force, so as to ensure reliable disconnection.

(III) electric operation

The electric control and human-computer interaction unit 90 takes electricity from the incoming line terminal 81, detects the current breaker state (for example, detection is performed by a mechanism action monitor 91 and/or a contact position monitor 92, the contact position detector can be electrically connected with the moving contact 53 through a flexible connecting line 921), receives a control signal (for example, remote control is active control, and overload protection is passive control), and when the electric control and human-computer interaction unit 90 receives a closing instruction, triggers the closing action of the bidirectional magnetic holding device, namely, the transmission shaft moves forwards to realize closing; when the electric control and human-computer interaction unit 90 receives a brake-separating or tripping command, the brake-separating action of the bidirectional magnetic holding device is triggered, that is, the transmission shaft moves backwards to realize brake separation. When the switch is switched on and off, the logic relation is the same as that of manual operation, and the description is omitted here.

It should be noted that, when the switch is switched on and off manually or electrically, the default circuit breaker and the distribution line are in a non-fault state, so as to ensure that the tripping shaft of the instantaneous tripping mechanism is transmitted between the transmission shaft of the bidirectional magnetic holding device and the ejector rod 514 of the transmission member 51. For example, the snap-action protection mechanism 60 is activated, and the overload or short-circuit protection is activated in the same logic as the electrically operated opening, and will not be described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A moving contact mechanism is characterized by comprising a transmission part, a moving contact support and a moving contact, wherein the transmission part is arranged in a shell in a sliding mode, the moving contact support is arranged in the shell in a rotating mode, the moving contact is arranged on the moving contact support, the transmission part is movably connected with the moving contact support, the transmission part is driven to move relative to the shell, and the moving contact is driven by the moving contact support to rotate relative to the shell so as to be switched on and off with a static contact in the shell.

2. The movable contact mechanism according to claim 1 further comprising a linkage shaft, wherein a connecting hole is disposed on a side of the driving member adjacent to the movable contact support, a kidney-shaped hole is disposed on the movable contact support, and the linkage shaft is disposed through the connecting hole and the kidney-shaped hole to movably connect the driving member to the movable contact support.

3. The movable contact mechanism according to claim 2, wherein when the movable contact is separated from the fixed contact, the linkage shaft abuts against a side of the kidney-shaped hole away from the rotation center of the movable contact support; when the moving contact and the static contact are switched on, the linkage shaft is abutted against one side of the kidney-shaped hole close to the rotating center of the moving contact support.

4. The movable contact mechanism according to claim 2, wherein the transmission member includes a connecting plate and two connecting lugs arranged in parallel and at an interval on a side of the connecting plate close to the movable contact support, each connecting lug is provided with the connecting hole, the two connecting holes correspond to each other, the movable contact support is accommodated between the two connecting lugs in a limited manner, and the linkage shaft is sequentially inserted into one connecting hole, the kidney-shaped hole and the other connecting hole.

5. The movable contact mechanism according to claim 4 further comprising a first elastic element, wherein the transmission element further comprises a guide post disposed on a side of the connecting plate close to the movable contact support, the first elastic element is sleeved on the guide post, one end of the first elastic element abuts against the transmission element, and the other end abuts against the housing, and the first elastic element is configured to provide a restoring force for a movement of the transmission element relative to the movable contact support.

6. The movable contact mechanism according to claim 5, wherein the number of the first elastic element and the number of the guide posts are two, the first elastic element and the guide posts are in one-to-one correspondence, and the two guide posts are disposed in parallel and at an interval outside the two connecting lugs.

7. The movable contact mechanism according to claim 5 further comprising a main shaft, wherein the movable contact support is further provided with a mounting hole, the main shaft is inserted into the mounting hole so as to rotatably connect the movable contact support to the housing, and a trajectory line of the driving member moving relative to the housing and an extension line of the guide post are parallel to each other and are both located between the main shaft and the linkage shaft.

8. The movable contact mechanism according to claim 1, further comprising a rotation shaft and a second elastic member, wherein the movable contact is provided with a rotation hole, the movable contact support is further provided with an assembly hole, the rotation shaft penetrates through the rotation hole and the assembly hole, so that the movable contact is rotatably connected with the movable contact support, the second elastic member is sleeved on the rotation shaft, and one end of the second elastic member abuts against the movable contact support while the other end abuts against the movable contact, so that the movable contact abuts against the movable contact support.

9. The movable contact mechanism according to claim 8, wherein the movable contact support has two connecting pieces disposed thereon in parallel and at an interval, each of the connecting pieces has the assembling hole, the two assembling holes correspond to each other, the movable contact is received between the two assembling holes in a limited manner, and the rotating shaft is sequentially inserted through one of the assembling holes, the rotating hole, and the other assembling hole.

10. A direct-acting circuit breaker is characterized by comprising a shell, a manual operating mechanism, an electric operating mechanism, a fixed contact and the moving contact mechanism as claimed in any one of claims 1 to 9, wherein the manual operating mechanism, the electric operating mechanism and the fixed contact are arranged in the shell, the manual operating mechanism is in transmission connection with the electric operating mechanism, the electric operating mechanism comprises a bidirectional magnetic retaining device, and a transmission shaft of the bidirectional magnetic retaining device can drive a transmission part of the moving contact mechanism to move relative to the shell.

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