CN118053706A - Switching device - Google Patents

Abstract

The invention belongs to the technical field of piezoelectric devices, and discloses a switching device. The switch electrical appliance comprises a fixed contact, a moving contact, an operating mechanism, a contact support and an opening locking device, wherein the operating mechanism drives the moving contact to be opened or closed with the fixed contact through the contact support, and the distance between the moving contact and the fixed contact when the moving contact is opened or closed by the operating mechanism is a first opening distance K1. The open-distance locking device is used for locking the moving contact which is repelled by the short-circuit current, and comprises a locking part, the moving contact moves to the locking part after being repelled, the locking part is used for locking the moving contact at a position with a second open distance K2 from the fixed contact, and the second open distance K2 is larger than the first open distance K1. The switch electrical appliance increases the contact opening distance when short-circuit current occurs, is favorable for the elongation and breaking of the electric arc, and can prevent the moving contact from resetting and being too close to the fixed contact to cause the re-burning of the electric arc.

Description

Switching device

Technical Field

The invention relates to the technical field of piezoelectric devices, in particular to a switching device.

Background

The control and protection switch, contactor, breaker and motor protector are important electric appliances for controlling circuit, and have high requirements for electric life and short-circuit breaking capacity. The damage of the arc generated during breaking to the contact directly affects the electric life of the product, and the rapid breaking speed and the high-efficiency arc extinguishing capability are required in the process of breaking rated current so as to achieve the purposes of frequent operation and high reliability. However, when the short-circuit current is cut off, a contact opening distance needs to be large enough to pull the arc longer, so that arc extinction is convenient.

With the development trend of increasingly miniaturized switching appliances, the reduction of product structure and volume leads to the reduction of the opening distance between a moving contact and a fixed contact, and the electric arc generated when the contact breaks short-circuit current is difficult to be elongated and broken, and the electric arc stays between the moving contact and the fixed contact for a long time, so that the contact is ablated and damaged. Meanwhile, in the short-circuit breaking arc extinguishing process, the time (generally 10 ms) from the release of the electromagnet and the action of the operating mechanism to a sufficient opening position is far longer than the time (generally 1 ms) from the moving contact to the maximum distance from the fixed contact under the action of electric repulsive force, and the moving contact is reset under the action of a spring and is too close to the fixed contact, so that the condition of re-burning is easy to happen, and the short-circuit breaking reliability is insufficient.

Accordingly, there is a need for improvements in switching devices to address the above issues.

Disclosure of Invention

The invention aims to provide a switching electric appliance, which increases the contact opening distance when short-circuit current occurs, is favorable for the elongation and breaking of an electric arc, and can prevent the moving contact from resetting and being too close to a fixed contact to cause the re-burning of the electric arc.

To achieve the purpose, the invention adopts the following technical scheme:

A switching device, comprising:

A fixed contact and a moving contact;

the operating mechanism drives the moving contact to be separated from the fixed contact through the contact support, and the distance between the moving contact and the fixed contact when the moving contact is driven by the operating mechanism to be separated is a first opening distance K1;

The open-distance locking device is used for locking the moving contact which is repelled by short-circuit current, and comprises a locking part, wherein the moving contact moves to the locking part after being repelled, the locking part is used for locking the moving contact at a position with a second open distance K2 from the fixed contact, and the second open distance K2 is larger than the first open distance K1.

As an alternative, the opening locking device further includes a locking body, the locking portion is disposed on the locking body, one end of the locking body is rotatably disposed, the moving contact abuts against one side of the locking portion to enable the locking body to rotate, so that the moving contact can move continuously to the other side of the locking portion, and the locking body can rotate and reset, so that the moving contact abuts against the other side of the locking portion.

As an alternative, the locking portion is provided with an abutment inclined plane, and the moving contact slides along the abutment inclined plane when abutting against the locking portion, so as to drive the locking body to rotate.

As an alternative, the distance locking device further comprises:

the first reset piece is arranged on one side of the locking body, where the locking part is arranged, and is used for applying a pulling force to the locking body so as to enable the locking body to rotate and reset.

As an alternative, two locking bodies are arranged along the extending direction of the moving contact, the locking parts are arranged on one side of the locking bodies facing the moving contact, and two ends of the first reset piece are respectively connected with the two locking bodies.

As an alternative, the contact support is disposed between the two locking bodies, one end of the locking body far away from the rotation center of the locking body is bent towards the contact support to form an unlocking portion, and the operating mechanism drives the contact support to be inserted between the two unlocking portions during opening the switch, so as to drive the locking bodies to rotate, and the locking portions and the moving contact are staggered.

Alternatively, a driving inclined plane is arranged on one side of the unlocking part, which faces the contact support, and the driving inclined plane gradually inclines towards the direction of the moving contact from one end, which is close to the contact support, to the other end.

Alternatively, the operating mechanism includes:

A bracket;

The gear is rotationally arranged on the bracket;

The connecting rod assembly is connected with the gear at one end;

The ejector rod is rotatably arranged on the support, the other end of the connecting rod assembly is connected with the ejector rod, the gear can rotate to drive the ejector rod to rotate through the connecting rod assembly, when in a closing state, the ejector rod releases the supporting pressure to the contact, the side surface of the ejector rod, which faces the contact, is set to be a plane, and a preset included angle alpha is kept between the plane and the moving direction supported by the contact.

Alternatively, the preset included angle alpha is set to 83-97 degrees.

Alternatively, the operating mechanism further includes:

And one end of the third reset piece is arranged on the support, the other end of the third reset piece is rotationally connected with the ejector rod, when the contact is in a switching-off state, the third reset piece applies resilience force to the ejector rod, so that the ejector rod reversely rotates to prop against the contact to support, and the connection point of the third reset piece and the ejector rod is positioned at the edge of one side of the ejector rod, which faces the contact to support.

Alternatively, in the closing state, the end of the ejector rod facing the third reset piece is set to be a pressing end, the pressing end is used for pressing the contact support, and the pressing end extends to the third reset piece to keep a preset gap with the third reset piece.

As an alternative, the pressing end is provided with a rounded corner.

As an alternative, the switching device further includes:

An electromagnetic system;

The top plate is arranged in a rotating mode, one end of the top plate is arranged opposite to the contact support, the other end of the top plate is connected to the electromagnetic system, the electromagnetic system can drive the top plate to rotate, so that one end of the top plate is propped against the contact support, the contact support is propped against the moving contact, the distance between the moving contact and the fixed contact is a third opening distance K3, and the third opening distance K3 is smaller than the second opening distance K2; when the electromagnetic system releases the force applied to the top plate, the top plate reversely rotates to release the supporting pressure to the contact.

The beneficial effects are that:

According to the switch electrical appliance provided by the invention, the opening-distance locking device is arranged, when short-circuit current occurs in the circuit and the moving contact is repelled, the moving contact which is repelled to a far distance is locked through the locking part, so that the moving contact is prevented from rebound and resetting, the moving bridge and the fixed contact keep a second opening distance K2, and the second opening distance K2 is larger than the first opening distance K1 when the moving contact and the fixed contact are driven to open by the operating mechanism, so that the arc between the moving contact and the fixed contact can be ensured to be lengthened and broken, and the arc reignition is avoided.

Drawings

Fig. 1 is a schematic structural diagram of a switching apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a switching apparatus according to an embodiment of the present invention after a base is removed;

FIG. 3 is a schematic view of a contact assembly and an open-pitch locking device according to an embodiment of the present invention;

FIG. 4 is a schematic view of a part of the structure of a contact assembly and an opening locking device according to an embodiment of the present invention;

FIG. 5 is a schematic view of the structure of FIG. 4 with the support removed;

FIG. 6 is a schematic illustration of the structure of FIG. 4 in a disassembled configuration;

Fig. 7 is a schematic diagram of a partial structure of a switching apparatus according to an embodiment of the present invention with a base removed;

FIG. 8 is a schematic structural view of an operating mechanism in a brake-off state according to an embodiment of the present invention;

fig. 9 is a schematic structural view of an operating mechanism in a closing state according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a structure of a switching device provided in an embodiment of the present invention in a normal switching-off state;

Fig. 11 is a schematic diagram II of a structure of a switching device in a normal switching-off state according to an embodiment of the present invention;

Fig. 12 is a schematic diagram of a structure of a switching device provided in an embodiment of the present invention in a normal switching-off state;

fig. 13 is a schematic diagram II of a structure of a switching device in a normal switching-off state according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a switching apparatus in a short-circuit switching-off state according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of a switching apparatus in an off state of an operating mechanism according to an embodiment of the present invention;

Fig. 16 is a schematic diagram II of a switch apparatus in an off state of an operating mechanism according to an embodiment of the present invention.

In the figure:

1. A contact assembly; 11. a stationary contact; 12. a moving contact; 121. pressing the bulge; 13. a support; 131. a mounting groove; 14. a fourth reset member;

2. A top plate; 21. a top pressing plate; 22. a connecting plate;

3. An operating mechanism; 31. a bracket; 32. a gear; 33. a connecting rod assembly; 331. a first link; 332. jumping buckle; 333. a second link; 34. a push rod; 341. a pressing end; 342. a spring mounting hole; 35. a third reset member;

4. A contact support; 41. a contact pressing groove; 42. matching with the inclined plane;

5. an opening distance locking device; 51. a locking body; 511. a rotating shaft; 512. avoidance holes; 513. a hook; 52. a locking part; 521. pressing the inclined plane; 53. a first reset member; 54. an unlocking part; 541. a driving inclined plane;

6. an electromagnetic system; 61. an electromagnet; 62. a coil; 63. a second reset member;

8. A base;

9. And (5) locking.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 and 2, the present embodiment provides a switching device including a base 8, and a contact assembly 1, a top plate 2, an operating mechanism 3, and an electromagnetic system 6 disposed in the base 8. The contact assembly 1 comprises a moving contact 12 and a fixed contact 11, and the control force of the operating mechanism 3 on the moving contact 12 is higher than that of the electromagnetic system 6. During normal operation, the operating mechanism 3 drives the top plate 2 to downwards press the contact support 4 to drive the moving contact 12 to be separated from the fixed contact 11, so that the switching-off of the switching device is realized; or the operating mechanism 3 avoids the space for upward movement for the top plate 2, so that the contact support 4 can move upward, and the moving contact 12 can move upward to be in contact with the fixed contact 11, thereby realizing the preliminary closing of the switching device. When the operating mechanism 3 is in a pre-closing state, the electromagnetic system 6 can drive the top plate 2 to press the contact support 4 downwards so as to separate the moving contact 12 from the fixed contact 11, or drive the top plate 2 to move upwards to avoid the contact support 4 so as to enable the moving contact 12 to move upwards to contact and close with the fixed contact 11. The specific construction and operation of the operating mechanism 3, the electromagnetic system 6 and the contact assembly 1 will be described in detail later.

When short-circuit current occurs in the circuit, the movable contact 12 is repelled, and the arc can be lengthened and extinguished only when the contact distance is large enough. In order to prevent the moving contact 12 from rebounding, the moving contact 12 is kept at a larger opening distance after being repelled, as shown in fig. 3, the switching apparatus in this embodiment further includes an opening distance locking device 5 for locking the moving contact 12 repelled by the short-circuit current, the opening distance locking device 5 includes a locking portion 52, the moving contact 12 moves to the locking portion 52 after being repelled, and the locking portion 52 is used for locking the moving contact 12 at a position at a second opening distance K2 from the fixed contact 11. The operating mechanism 3 drives the moving contact 12 to be switched on or off with the fixed contact 11 through the contact support 4, and the distance between the moving contact 12 and the fixed contact 11 when the moving contact 12 is switched on or off by the operating mechanism 3 is a first opening distance K1, and a second opening distance K2 is larger than the first opening distance K1.

Through setting up the opening locking device 5, when short circuit current appears in the circuit, the moving contact 12 is by the repulsion, will repel the moving contact 12 of remote distance through locking part 52 and lock, prevent that moving contact 12 from taking place to rebound and reset, make moving contact 12 and static contact 11 keep second opening K2, second opening K2 is greater than moving contact 12 and the first opening K1 when static contact 11 is driven the separating brake by operating device 3 to can guarantee that the electric arc between moving contact 12 and the static contact 11 is elongated to break, avoid electric arc reignition.

Optionally, as shown in fig. 3 and 4, the contact assembly 1 further comprises a support 13, the support 13 being fixed to the base 8 by means of a plurality of screws. The holder 13 is provided with a mounting groove 131, and the contact holder 4 is provided in the mounting groove 131 and is slidable up and down in the mounting groove 131.

As shown in fig. 5, a contact pressing groove 41 is provided at the lower end of the contact support 4, the moving contact 12 is provided in the contact pressing groove 41, and two contacts opposite to the two fixed contacts 11 are formed at two ends of the moving contact 12 extending left and right. When the contact support 4 moves downward, it will move downward against the moving contact 12, separating the moving contact 12 from the stationary contact 11.

As shown in fig. 5 and 6, in order that the moving contact 12 can automatically move upward to contact with the fixed contact 11 to close after the operating mechanism 3 or the electromagnetic system 6 releases the contact support 4, a fourth reset element 14 is provided between the moving contact 12 and the support 13, and the fourth reset element 14 may specifically employ a compression spring. The compression spring applies an upward elastic force to the movable contact 12, which is smaller than the pressure applied to the contact support 4 by the operating mechanism 3 and the electromagnetic system 6, so that the movable contact 12 can be opened against the elastic force of the fourth reset piece 14; when the operating mechanism 3 or the electromagnetic system 6 releases the pressing of the contact support 4, the moving contact 12 moves upwards under the elasticity of the fourth reset piece 14 to contact with the fixed contact 11 for closing.

The construction of the distance locking means 5 is described in detail below in connection with fig. 5-7.

Optionally, the opening locking device 5 further includes a locking body 51, the locking portion 52 is disposed on the locking body 51), one end of the locking body 51 is rotatably disposed, the moving contact 12 abuts against one side of the locking portion 52 to enable the locking body 51 to rotate, so that the moving contact 12 can continue to move towards the other side of the locking portion 52, and the locking body 51 can rotate and reset, so that the moving contact 12 abuts against the other side of the locking portion 52, and locking of the moving contact 12 is achieved.

Specifically, the upper end of the locking body 51 is rotatably provided to the support 13, and both the front side and the rear side of the locking body 51 are provided with a rotation shaft 511, which is rotatably coupled to the support 13 through the rotation shaft 511. The lock body 51 is provided with a dodging hole 512, and the moving contact 12 passes through the dodging hole 512 and can move up and down in the dodging hole 512.

Alternatively, the locking portion 52 is provided with an abutment inclined surface 521, and the movable contact 12 slides along the abutment inclined surface 521 when abutting against the locking portion 52 to drive the locking body 51 to rotate.

The locking portion 52 is provided as a locking protrusion, the pressing inclined surface 521 is provided on the locking protrusion, and the pressing protrusion 121 is provided on the movable contact 12. When the moving contact 12 is repelled, the pressing protrusion 121 will abut against the pressing inclined plane 521, the moving contact 12 will continue to move downwards under the action of repulsive force and slide along the pressing inclined plane 521, and the locking body 51 will be pushed to rotate until the pressing protrusion 121 moves to the lower side of the locking portion 52, the locking body 51 will return to reset after losing the pressing of the moving contact 12, so that the locking portion 52 moves to the upper side of the locking protrusion, limiting the moving contact 12, and preventing the moving contact 12 from rebound and resetting under the action of the fourth resetting piece 14.

In order to achieve the turning reset of the locking body 51, as shown in fig. 5, the open-distance locking device 5 further includes a first reset member 53, the first reset member 53 is disposed on the side of the locking body 51 where the locking portion 52 is disposed, and the first reset member 53 is used to apply a pulling force to the locking body 51 to turn the locking body 51 back. The first restoring member 53 may be an elastic band.

When the locking body 51 is provided with one, one end of the first restoring member 53 may be fixed to the support 13, and the other end may be connected to the locking body 51, so that the first restoring member 53 may apply a tensile force to the locking body 51.

In the present embodiment, two locking bodies 51 are provided, the two locking bodies 51 are arranged along the extending direction of the moving contact 12, that is, along the left-right direction, the locking portion 52 is provided at a side of the locking body 51 facing the moving contact 12, and both ends of the first reset member 53 are respectively connected to the two locking bodies 51. After the moving contact 12 moves to the lower side of the lock portion 52, the first restoring member 53 simultaneously pulls the two lock bodies 51, and rotates the two lock bodies 51 in the direction approaching each other. The locking body 51 is disposed at the outer side of the support 13, and the locking body 51 stops rotating when abutting against the support 13 during rotation, so as to prevent the locking body 51 from rotating to the contact support 4 and interfering with the contact support 4, so that the contact support 4 cannot outwardly abut against the locking body 51.

As shown in fig. 5, in order to facilitate the installation of the first restoring member 53, a hook 513 is provided on the locking body 51, and the first restoring member 53 is hung on the hook 513. Specifically, the hook 513 is provided on the side of the lock body 51 facing away from the contact support 4 to facilitate the hooking installation of the first restoring member 53.

Further, the contact support 4 is disposed between the two lock bodies 51, and one end of the lock body 51 away from the rotation center thereof is bent toward the contact support 4 to form an unlocking portion 54. When the switch is opened, the operating mechanism 3 drives the contact support 4 to be inserted between the two unlocking parts 54 so as to drive the locking body 51 to rotate and enable the locking part 52 to be staggered with the moving contact 12. When the contact support 4 moves downwards under the drive of the operating mechanism 3, the contact support 4 is inserted between the unlocking parts 54 of the two locking bodies 51 to drive the locking bodies 51 to rotate, so that the locking parts 52 avoid the pressing protrusions 121 on the moving contact 12, and the limit on the moving contact 12 is released, and the moving contact 12 rebounds upwards to be abutted against the contact support 4 under the action of the fourth reset piece 14. The opening distance between the moving contact 12 and the fixed contact 11 is restored to the first opening distance K1.

Specifically, as shown in fig. 5, the unlocking portion 54 is provided with a driving inclined surface 541 on a side facing the contact support 4, and the driving inclined surface 541 is gradually inclined from one end near the contact support 4 to the other end toward the moving contact 12, so that the contact support 4 can move downward along the driving inclined surface 541 to spread the two locking bodies 51 outward. Optionally, the mating inclined surfaces 42 are provided on the left and right sides of the lower end of the contact support 4 toward the two unlocking portions 54, and when the contact support 4 moves downward, the mating inclined surfaces 42 abut against the driving inclined surfaces 541, so that the contact support 4 can drive the unlocking portions 54 more smoothly through surface-to-surface contact.

As shown in fig. 8 and 9, the operating mechanism 3 includes a bracket 31, a gear 32, a link assembly 33 and a jack 34, the gear 32 and the jack 34 are rotatably provided on the bracket 31, the gear 32 is connected with a handle (not shown) extending out of the base 8, and the gear 32 is driven to rotate by rotating the handle. One end of the connecting rod assembly 33 is connected to the gear 32, the other end of the connecting rod assembly 33 is connected to the ejector rod 34, the gear 32 can drive the ejector rod 34 to rotate through the connecting rod assembly 33, in the closing state, the ejector rod 34 releases the pressing of the top plate 2, namely the pressing of the contact support 4 is released, the side surfaces of the ejector rod 34, facing the top plate 2 and the contact support 4, are set to be planes, and a preset included angle alpha is kept between the planes and the moving direction of the contact support 4.

When the switching on/off of the switching device needs to be regulated by the operating mechanism 3, as shown in fig. 8, the operating mechanism 3 is in a switching-off state, the handle is turned to drive the gear 32 to rotate, the link assembly 33 drives the ejector rod 34 to rotate, so that the ejector rod 34 is pressed against the top plate 2 downwards, the top plate 2 is pressed against the contact support 4 to move downwards, and the moving contact 12 is driven to be separated from the fixed contact 11; fig. 9 is a schematic diagram of the operating mechanism 3 in a closing state, when the handle is reversely rotated, the ejector rod 34 is driven to reversely rotate to avoid the top plate 2, and an avoidance space is provided for upward movement of the contact support 4, so that contact closing between the upward movement of the moving contact 12 and the fixed contact 11 can be realized. In the closing state, the lower side surface of the ejector rod 34 and the upper side surface of the contact support 4 are kept at a preset angle alpha, and the space which can be avoided by the ejector rod 34 can be optimally set through the design of the preset angle alpha, so that the layout of the structures such as the operating mechanism 3, the top plate 2, the contact support 4 and the like is more compact, and the miniaturization development trend of the switching electric appliance is facilitated.

Optionally, the preset angle α is set to 83 ° to 97 °, preferably 90 °. In the closed state, the ejector rod 34 and the top plate 2 are basically kept parallel, and a large space can be reserved for upward movement of the top plate 2 by the arrangement.

Alternatively, as shown in fig. 9, the link assembly 33 includes a first link 331, a trip 332 and a second link 333 that are sequentially rotatably connected, the first link 331 connects the gear 32 and the trip 332, the second link 333 connects the trip 332 and the jack 34, and the trip 332 is selectively fastened to the latch 9 of the switching device. The link assembly 33 and the latch 9 may be of various conventional structures of switching devices in the prior art, and are not limited thereto.

Optionally, as shown in fig. 9, the operating mechanism 3 further includes a third reset element 35, one end of the third reset element 35 is disposed on the support 31, and the other end of the third reset element 35 is rotatably connected to the ejector rod 34, in the opening state, the third reset element 35 applies a resilience force to the ejector rod 34, so that the ejector rod 34 reversely rotates to press against the top plate 2, and a connection point between the third reset element 35 and the ejector rod 34 is located at an edge of the ejector rod 34 facing the contact support 4 and the top plate 2. The third restoring member 35 may employ a torsion spring. In order to facilitate the installation of the third restoring member 35, a spring installation hole 342 is provided on the ejector rod 34, and the end portion of the third restoring member 35 is inserted into the spring installation hole 342 for connection installation.

When the switch-on is performed, the operating handle drives the gear 32 to rotate clockwise, the gear 32 is provided with the first connecting rod 331, the first connecting rod 331 drives the jump button 332 to deflect leftwards, the upper part of the jump button 332 is contacted with the lock catch 9 and limited by the jump button, the jump button 332 rotates around the contact point with the lock catch 9 under the pushing of the first connecting rod 331, the second connecting rod 333 is pulled to move leftwards, the second connecting rod 333 overcomes the force of the third reset piece 35 to pull the ejector rod 34 to rotate upwards, and the dead point position is crossed until the switch-on is in place. Fig. 9 shows a closed state, in which the lower side of the jack 34 is horizontally straight and is substantially flush with the lower side of the bracket 31. When the operating mechanism 3 is disconnected, the handle pushes the gear 32 to rotate anticlockwise, drives the first connecting rod 331, the jump buckle 332 and the second connecting rod 333 to reset, and the ejector rod 34 moves downwards under the action of the third reset piece 35 to push the top plate 2 to realize the disconnection action. When faults such as overload or short circuit occur, the lock catch 9 rotates to unlock the jump button 332, the ejector rod 34 moves downwards under the action of the third reset piece 35 to realize the disconnection action, meanwhile, the second connecting rod 333 is driven by the ejector rod 34 to act, the gear 32 rotates, after the lock catch 9 resets, the gear 32 is operated to reset, the reset operation is realized, and the normal connection and disconnection operation can be carried out in the next step.

In the closing state, as shown in fig. 9, the end of the ejector rod 34 facing the third reset member 35 is set as a pressing end 341, the pressing end 341 is used for pressing the top plate 2, and the pressing end 341 extends to the third reset member 35 to keep a preset gap with the third reset member 35, so as to prevent interference between the pressing end 341 and the third reset member 35, and ensure that the ejector rod 34 can rotate normally.

Optionally, as shown in fig. 9, the pressing end 341 is provided with a rounded corner to increase the structural strength and the stress surface of the pressing end 341, so as to avoid damaging the top plate 2 by the tip of the pressing end 341.

Specifically, as shown in fig. 9, the ejector rod 34 is configured in a triangle structure, taking the position of the ejector rod 34 as an example in the closing state, the lower left vertex angle of the ejector rod 34 is rotationally connected to the bracket 31, the upper vertex angle of the ejector rod 34 is rotationally connected to the second connecting rod 333, and the third reset member 35 is connected to the lower right vertex angle of the ejector rod 34. On the premise of ensuring enough structural strength, the connection point of the third reset piece 35 and the ejector rod 34 is as close to the lower side edge of the ejector rod 34 as possible, so that the ejector rod 34 has a yielding stroke as large as possible. Meanwhile, on the premise that the ejector rod 34 does not interfere with the third reset piece 35, the length of the lower side surface of the ejector rod 34 is as large as possible, so that the pressing end 341 has as large an operation stroke as possible. That is, the preset gap between the pressing end 341 and the third restoring member 35 is set to be a small gap, so as to ensure that the pressing end 341 and the third restoring member do not interfere with each other during operation.

Alternatively, as shown in fig. 10 and 11, the top plate 2 is rotatably disposed, one end of the top plate 2 is disposed opposite to the contact support 4, the other end of the top plate 2 is connected to the electromagnetic system 6, the electromagnetic system 6 can drive the top plate 2 to rotate, so that one end of the top plate 2 presses the contact support 4 against the moving contact 12, so that the contact support 4 presses the moving contact 12 and the fixed contact 11 at a third distance K3, and the third distance K3 is smaller than the second distance K2 through the design of the stroke of the electromagnetic system 6. When the electromagnetic system 6 releases the force applied to the top plate 2, the top plate 2 rotates reversely, and the contact support 4 is released from being pressed, so that the contact support 4 can move upwards, and the movable contact 12 moves upwards to be in contact with the fixed contact 11.

Specifically, the electromagnetic system 6 includes an electromagnet 61, a coil 62, and a second restoring member 63, and the second restoring member 63 may specifically be a spring, and the top plate 2 is rotatably connected to the electromagnet 61. The top plate 2 comprises a top pressing plate 21 and two connecting plates 22, wherein the top pressing plate 21 extends along the arrangement direction of the three contact supports 4 and is used for pressing the contact supports 4. The two connecting plates 22 are respectively arranged at two ends of the top pressing plate 21 in the length direction, the connecting plates 22 are rotationally connected with the electromagnets 61, the middle positions of the connecting plates 22 are rotationally arranged on the shell of the electromagnetic system 6, and the connecting plates 22 are driven to rotate by the electromagnets 61 so as to drive the top pressing plate 21 to move up and down.

As shown in fig. 12 and 13, a schematic diagram of a state in which the electromagnetic system 6 controls the switching device to switch on is shown, in a normal on state of the switching device, the operating mechanism 3 switches on, the ejector rod 34 is lifted, and a space for the top pressing plate 21 to move upwards is reserved; the electromagnet 61 is attracted to compress the second reset piece 63, the pressing plate 21 is lifted, the moving contact 12 moves upwards under the action of the fourth reset piece 14, the moving contact 12 is communicated with the fixed contact 11, and the product is electrified.

As shown in fig. 10 and 11, a schematic diagram of a state in which the electromagnetic system 6 controls the switching device to switch off is shown, in a normal off state of the switching device, the operating mechanism 3 is switched on, and the ejector rod 34 is lifted to leave a space for moving the top pressing plate 21. The electromagnet 61 releases the second reset piece 63, the top plate 2 rotates clockwise, the pressing plate 21 presses the contact support 4, the contact support 4 overcomes the force of the fourth reset piece 14 to move downwards, the moving contact 12 leaves the fixed contact 11, the moving contact 12 and the fixed contact 11 are isolated by air to disconnect products, at the moment, the distance between the moving contact 12 and the fixed contact 11 is a third distance K3, the distance is influenced by the stroke of the electromagnet 61, at the moment, the moving contact 12 is positioned above the locking part 52, and the distance locking device 5 has no influence on the third distance K3.

Fig. 14 shows a schematic diagram of the switching device opening when a short circuit occurs in the circuit, and when a short circuit occurs at a high current, an electric repulsive force is generated, so that the moving contact 12 is pushed to move away from the fixed contact 11, and the movement stroke exceeds the locking part 52 of the opening locking device 5. As the short-circuit current decreases, the electric repulsive force decreases, the moving contact 12 moves upward under the action of the fourth reset element 14, is locked at the lower side of the locking portion 52, cannot continue to move upward, and the moving contact 12 and the fixed contact 11 are maintained at the second opening distance K2, so that the decrease of the distance between the moving contact 12 and the fixed contact 11 is avoided. At this time, the operating mechanism 3 is in the tripping movement, the electromagnetic system 6 is also in the opening movement, and the contact support 4 remains in the closing position. When the ejector rod 34 of the operating mechanism 3 moves downwards to the bottom, namely, in the limit position process, the contact support 4 is driven to push the locking body 51 to swing outwards, the locking part 52 on the locking body simultaneously moves outwards, unlocking of the moving contact 12 is achieved, the moving contact 12 moves upwards and is kept at the opening position by the contact support 4, and the moving contact 12 and the fixed contact 11 are kept at the second opening distance K2.

As shown in fig. 15 and 16, the schematic diagrams of the operation mechanism is opened after the operation mechanism is tripped or separated, the operation mechanism 1 is tripped or separated, the ejector rod 34 is rotated to press down, the ejector rod 34 presses the pressing plate 21, the pressing plate 21 presses the contact support 4, so that the contact support 4 presses the moving contact 12, and the distance between the moving contact 12 and the fixed contact 11 reaches the second opening distance K2. Since the stroke of the operating mechanism 3 is larger than the operation stroke of the electromagnet 61, the first opening K1 is larger than the third opening K3, and the moving contact 12 is located at the middle part of the locking part 52 and is in the unlocked state. When the operating mechanism 3 is disconnected or separated, a release action signal is sent to the electromagnetic system 6, so that the electromagnetic system 6 also starts the separation action, and the coordination of the actions of the operating mechanism 3 and the electromagnetic system 6 is ensured. In addition, the tripping action of the operating mechanism 3 has priority over the action of the electromagnetic system 6, even if the electromagnetic system 6 does not act, the top plate 3 can move downwards freely without being influenced by the electromagnet 61, and the action can be reflected immediately under the action of the downward force of the ejector rod 2.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (13)

1. Switching device, its characterized in that includes:

A fixed contact (11) and a movable contact (12);

The control device comprises an operating mechanism (3) and a contact support (4), wherein the operating mechanism (3) drives the movable contact (12) to be separated from the fixed contact (11) through the contact support (4), and the distance between the movable contact (12) and the fixed contact (11) when the movable contact and the fixed contact (11) are driven to be separated by the operating mechanism (3) is a first opening distance K1;

the open-distance locking device (5) is used for locking the moving contact (12) which is repelled by short-circuit current, the open-distance locking device (5) comprises a locking part (52), the moving contact (12) moves to the locking part (52) after being repelled, the locking part (52) is used for locking the moving contact (12) at a position which is away from the fixed contact (11) by a second open distance K2, and the second open distance K2 is larger than the first open distance K1.

2. The switching device according to claim 1, wherein the opening locking device (5) further comprises a locking body (51), the locking portion (52) is disposed on the locking body (51), one end of the locking body (51) is rotatably disposed, the moving contact (12) is pressed against one side of the locking portion (52) to enable the locking body (51) to rotate, so that the moving contact (12) can continue to move to the other side of the locking portion (52), and the locking body (51) can rotate and reset, so that the moving contact (12) is pressed against the other side of the locking portion (52).

3. The switching device according to claim 2, wherein the locking portion (52) is provided with a pressing inclined surface (521), and the moving contact (12) slides along the pressing inclined surface (521) when pressing the locking portion (52) to drive the locking body (51) to rotate.

4. Switching device according to claim 2, characterized in that the opening locking means (5) further comprise:

The first reset piece (53) is arranged on one side of the locking body (51) where the locking part (52) is arranged, and the first reset piece (53) is used for applying a pulling force to the locking body (51) so as to enable the locking body (51) to rotate and reset.

5. The switching device according to claim 4, wherein two locking bodies (51) are provided, the two locking bodies (51) are arranged along the extending direction of the moving contact (12), the locking portion (52) is provided at a side of the locking body (51) facing the moving contact (12), and both ends of the first reset member (53) are respectively connected to the two locking bodies (51).

6. The switching device according to claim 5, wherein the contact support (4) is disposed between the two locking bodies (51), one end of the locking body (51) away from the rotation center thereof is bent toward the contact support (4) to form an unlocking portion (54), and the operating mechanism (3) drives the contact support (4) to be inserted between the two unlocking portions (54) when opening the switch, so as to drive the locking body (51) to rotate to stagger the locking portion (52) and the moving contact (12).

7. The switching device according to claim 6, wherein the unlocking portion (54) is provided with a driving inclined surface (541) toward one side of the contact support (4), and the driving inclined surface (541) is gradually inclined toward the moving contact (12) from one end toward the other end near the contact support (4).

8. Switching device according to any one of claims 1-7, characterized in that the operating mechanism (3) comprises:

A bracket (31);

A gear (32) rotatably provided on the bracket (31);

-a connecting rod assembly (33), one end of the connecting rod assembly (33) being connected to the gear (32);

Ejector rod (34), ejector rod (34) rotate set up in on support (31), link assembly (33) the other end connect in ejector rod (34), gear (32) rotate can pass through link assembly (33) drive ejector rod (34) rotate, when closing a floodgate state, ejector rod (34) is released to contact support (4) support the pressure, just ejector rod (34) orientation contact support (4) side sets up to the plane, the plane with contact support (4) removal direction between keep predetermineeing contained angle alpha.

9. A switching device according to claim 8, wherein the preset angle α is set to 83 ° -97 °.

10. Switching device according to claim 8, characterized in that the operating mechanism (3) further comprises:

And one end of the third reset piece (35) is arranged on the support (31), the other end of the third reset piece is rotationally connected with the ejector rod (34), when the switch-off state is carried out, the third reset piece (35) applies resilience force to the ejector rod (34) to enable the ejector rod (34) to reversely rotate so as to resist the contact support (4), and a connecting point of the third reset piece (35) and the ejector rod (34) is positioned at one side edge of the ejector rod (34) towards the contact support (4).

11. Switching device according to claim 10, characterized in that in the closed state the end of the plunger (34) facing the third return element (35) is provided as a pressing end (341), the pressing end (341) being adapted to press the contact support (4), and the pressing end (341) extending towards the third return element (35) to maintain a preset gap with the third return element (35).

12. Switching device according to claim 11, characterized in that the abutment end (341) is provided with rounded corners.

13. The switching device according to any one of claims 1 to 7, further comprising:

An electromagnetic system (6);

The top plate (2) is rotatably arranged, one end of the top plate (2) is opposite to the contact support (4), the other end of the top plate (2) is connected to the electromagnetic system (6), the electromagnetic system (6) can drive the top plate (2) to rotate, so that one end of the top plate (2) is propped against the contact support (4), the contact support (4) is propped against the moving contact (12), the distance between the moving contact (12) and the fixed contact (11) is a third opening distance K3, and the third opening distance K3 is smaller than the second opening distance K2; when the electromagnetic system (6) releases the force applied to the top plate (2), the top plate (2) rotates reversely to release the pressing of the contact support (4).