Switching device

Abstract

The utility model belongs to the technical field of low-voltage apparatuses, and discloses a switching apparatus. The switching device comprises a static contact, a moving contact, an operating mechanism, a contact support and an opening distance locking device, the operating mechanism drives the moving contact and the static contact to be opened and closed through the contact support, and the distance between the moving contact and the static contact is a first opening distance K1 when the moving contact and the static contact are driven by the operating mechanism to be opened. The opening distance locking device is used for locking the moving contact which is repelled by the short-circuit current, the opening distance locking device 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 the position where the distance between the moving contact and the static contact is a second opening distance K2, and the second opening distance K2 is larger than the first opening distance K1. According to the switching device, the opening distance of the contacts when short-circuit current occurs is increased, lengthening and breaking of an electric arc are facilitated, and meanwhile, the situation that the moving contact is reset and the distance between the moving contact and the static contact is too close to cause electric arc reignition can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a switch electrical appliance. Background Art

[0002] Control and protection switches, contactors, circuit breakers, motor protectors and other switching devices are important electrical devices used to control circuits, and have high requirements for electrical life and short-circuit breaking capacity. The damage caused to the contacts by the arc generated during breaking directly affects the electrical life of the product. In the process of breaking the rated current, a faster breaking speed and efficient arc extinguishing ability are required to achieve frequent operation and higher reliability. However, when breaking the short-circuit current, a sufficiently large contact opening distance is required to pull the arc longer, which is convenient for arc extinguishing.

[0003] With the development trend of increasingly miniaturized switching electrical appliances, the reduction in product structure and volume has led to a reduction in the distance between the moving contact and the static contact. The arc generated when the contact breaks the short-circuit current is difficult to be elongated and broken, and the arc stays between the moving contact and the static contact for a long time, causing contact ablation damage. At the same time, during the short-circuit breaking and arc extinguishing process, the time for the electromagnet to release and the operating mechanism to move to a sufficient distance position (generally 10ms) is much longer than the time for the moving contact to leave the static contact to the maximum distance under the action of the electric repulsion force (generally 1ms). The moving contact is reset under the action of the spring and is too close to the static contact, which is prone to reignition, resulting in insufficient short-circuit breaking reliability.

[0004] Therefore, it is urgent to improve the switch electrical equipment to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a switch electrical appliance, which increases the contact opening distance when a short-circuit current occurs, is conducive to the elongation and breaking of the arc, and can prevent the moving contact from resetting and being too close to the static contact to cause the arc to reignite.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Switchgear, including:

[0008] Stationary contact and moving contact;

[0009] An operating mechanism and a contact support, wherein the operating mechanism drives the moving contact and the static contact to open via the contact support, and the distance between the moving contact and the static contact when the moving contact and the static contact are opened by the operating mechanism is a first opening distance K1;

[0010] An opening distance locking device is used to lock the moving contact that is repelled by the short-circuit current. The opening distance locking device includes a locking part. The moving contact moves to the locking part after being repelled. The locking part is used to lock the moving contact at a position where the distance from the static contact is a second opening distance K2, and the second opening distance K2 is greater than the first opening distance K1.

[0011] As an optional solution, the opening distance locking device also includes a locking body, the locking part is arranged on the locking body, one end of the locking body is rotatably arranged, and the moving contact presses against one side of the locking part to cause the locking body to rotate, so that the moving contact can continue to move toward the other side of the locking part, and the locking body can rotate and reset so that the moving contact presses against the other side of the locking part.

[0012] As an optional solution, the locking portion is provided with a pressing inclined surface, and when the moving contact presses against the locking portion, it slides along the pressing inclined surface to drive the locking body to rotate.

[0013] As an optional solution, the distance locking device further includes:

[0014] The first reset member is arranged on one side of the locking body where the locking portion is arranged, and is used to apply a pulling force to the locking body so as to make the locking body rotate and reset.

[0015] As an optional solution, two locking bodies are provided, the two locking bodies are arranged along the extension direction of the moving contact, the locking portion is provided on the side of the locking body facing the moving contact, and the two ends of the first reset member are respectively connected to the two locking bodies.

[0016] As an optional solution, the contact support is arranged between the two locking bodies, and one end of the locking body away from its rotation center is bent toward the contact support to form an unlocking portion. When the switch is opened, the operating mechanism drives the contact support to be inserted between the two unlocking portions to drive the locking body to rotate so that the locking portion and the moving contact are offset.

[0017] As an optional solution, a driving inclined surface is provided on a side of the unlocking portion facing the contact support, and the driving inclined surface gradually inclines toward the moving contact from one end close to the contact support to the other end.

[0018] As an optional solution, the operating mechanism includes:

[0019] Bracket;

[0020] A gear, rotatably disposed on the bracket;

[0021] A connecting rod assembly, one end of which is connected to the gear;

[0022] A push rod, the push rod is rotatably arranged on the bracket, the other end of the connecting rod assembly is connected to the push rod, the rotation of the gear can drive the push rod to rotate through the connecting rod assembly, when the switch is in the closed state, the push rod releases the pressure on the contact support, and the side of the push rod facing the contact support is set to a plane, and a preset angle α is maintained between the plane and the moving direction of the contact support.

[0023] As an optional solution, the preset angle α is set to 83°-97°.

[0024] As an optional solution, the operating mechanism further includes:

[0025] A third reset member, one end of the third reset member is arranged on the bracket, and the other end is rotatably connected to the push rod. When the switch is in the open state, the third reset member applies a rebound force to the push rod, so that the push rod rotates in the opposite direction to press the contact support. The connection point between the third reset member and the push rod is located at a side edge of the push rod facing the contact support.

[0026] As an optional solution, in the closed state, the end of the push rod facing the third reset member is set as a pressing end, the pressing end is used to press the contact support, and the pressing end extends toward the third reset member until a preset gap is maintained between the pressing end and the third reset member.

[0027] As an optional solution, the pressing end is provided with a rounded corner.

[0028] As an optional solution, the switch electrical device further includes:

[0029] Electromagnetic systems;

[0030] A top plate, wherein the top plate is rotatably arranged, one end of the top plate is arranged opposite to the contact support, and the other end of the top plate is connected to the electromagnetic system, and the electromagnetic system can drive the top plate to rotate so that one end of the top plate presses against the contact support, so that the contact support presses against the moving contact, so that the distance between the moving contact and the static 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 on the top plate, the top plate rotates in the opposite direction to release the pressure on the contact support.

[0031] Beneficial effects:

[0032] The switch electrical appliance proposed by the utility model is provided with an opening distance locking device. When a short-circuit current appears in the circuit and the moving contact is repelled, the locking part locks the moving contact that is repelled to a long distance to prevent the moving contact from rebounding and resetting, so that the moving-static bridge and the static contact maintain a second opening distance K2. The second opening distance K2 is greater than the first opening distance K1 when the moving contact and the static contact are driven to open by the operating mechanism, thereby ensuring that the arc between the moving contact and the static contact is elongated and disconnected, thereby avoiding the reignition of the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a switch electrical appliance provided by an embodiment of the utility model;

[0034] Figure 2 This is a schematic diagram of the structure of the switch provided by the embodiment of the utility model with the base removed;

[0035] Figure 3 It is a structural schematic diagram of a contact assembly and a distance locking device provided in an embodiment of the utility model;

[0036] Figure 4 It is a partial structural schematic diagram of the contact assembly and the distance locking device provided by the embodiment of the utility model;

[0037] Figure 5 yes Figure 4 Schematic diagram of the structure after the support is removed from the middle structure;

[0038] Figure 6 yes Figure 4 Schematic diagram of the disassembled structure of the medium structure;

[0039] Figure 7 This is a schematic diagram of the partial structure of the switch provided by the embodiment of the utility model after the base is removed;

[0040] Figure 8 It is a structural schematic diagram of the operating mechanism provided by the embodiment of the utility model in the open state;

[0041] Fig. 9 It is a structural schematic diagram of the operating mechanism provided by the embodiment of the utility model in the closed state;

[0042] Fig.10 This is a schematic diagram of the structure of the switch provided by the embodiment of the utility model in the normal open state. Figure 1 ;

[0043] Fig.11 This is a schematic diagram of the structure of the switch provided by the embodiment of the utility model in the normal open state. Figure 2 ;

[0044] Fig.12This is a schematic diagram of the structure of the switch provided by the embodiment of the utility model in the normal open state. Figure 1 ;

[0045] Fig.13 This is a schematic diagram of the structure of the switch provided by the embodiment of the utility model in the normal open state. Figure 2 ;

[0046] Fig.14 It is a schematic diagram of the structure of the switch provided by the embodiment of the utility model in the short-circuit opening state;

[0047] Fig.15 This is a schematic diagram of the structure of the switch provided by the embodiment of the utility model when the operating mechanism is disconnected. Figure 1 ;

[0048] Fig.16 This is a schematic diagram of the structure of the switch provided by the embodiment of the utility model when the operating mechanism is disconnected. Figure 2 .

[0049] In the figure:

[0050] 1. contact assembly; 11. static contact; 12. moving contact; 121. pressing protrusion; 13. support; 131. mounting groove; 14. fourth reset member;

[0051] 2. Top plate; 21. Top pressure plate; 22. Connecting plate;

[0052] 3. operating mechanism; 31. bracket; 32. gear; 33. connecting rod assembly; 331. first connecting rod; 332. jump buckle; 333. second connecting rod; 34. push rod; 341. pressing end; 342. spring mounting hole; 35. third reset member;

[0053] 4. Contact support; 41. Contact pressure groove; 42. Matching slope;

[0054] 5. Distance locking device; 51. Locking body; 511. Rotating shaft; 512. Avoidance hole; 513. Hook; 52. Locking part; 521. Pressing inclined surface; 53. First reset member; 54. Unlocking part; 541. Driving inclined surface;

[0055] 6. Electromagnetic system; 61. Electromagnet; 62. Coil; 63. Second reset member;

[0056] 8. Base;

[0057] 9. Lock. DETAILED DESCRIPTION

[0058] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0059] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0061] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0062] like Figure 1 and Figure 2As shown, this embodiment provides a switch electrical appliance, including a base 8 and a contact assembly 1, a top plate 2, an operating mechanism 3 and an electromagnetic system 6 arranged in the base 8. The contact assembly 1 includes a moving contact 12 and a stationary contact 11, and the operating mechanism 3 has a higher control force on the moving contact 12 than the electromagnetic system 6. During normal operation, the operating mechanism 3 drives the top plate 2 to press the contact support 4 downward, driving the moving contact 12 to separate from the stationary contact 11, and realizing the disconnection of the switch electrical appliance; or the operating mechanism 3 avoids the space for the top plate 2 to move upward, so that the contact support 4 can move upward, so that the moving contact 12 can move upward and contact with the stationary contact 11, and realize the preparatory closing of the switch electrical appliance. When the operating mechanism 3 is in the preparatory closing state, the electromagnetic system 6 can drive the top plate 2 to press the contact support 4 downward to separate the moving contact 12 from the stationary contact 11, or drive the top plate 2 to move upward to avoid the contact support 4 so that the moving contact 12 moves upward to contact with the stationary contact 11 for closing. The specific structures and working principles of the operating mechanism 3, the electromagnetic system 6 and the contact assembly 1 will be described in detail later.

[0063] When a short circuit current occurs in the circuit, the moving contact 12 will be pushed apart. Only when the contact distance is large enough can the arc be elongated and extinguished. In order to prevent the moving contact 12 from rebounding, the moving contact 12 is kept at a large distance after being pushed apart, such as Figure 3 As shown, the switch in this embodiment further includes an opening distance locking device 5, which is used to lock the moving contact 12 that is repelled by the short-circuit current. The opening distance locking device 5 includes a locking portion 52. After being repelled, the moving contact 12 moves to the locking portion 52. The locking portion 52 is used to lock the moving contact 12 at a position where the distance from the static contact 11 is the second opening distance K2. The operating mechanism 3 drives the moving contact 12 and the static contact 11 to open and close through the contact support 4, and the distance between the moving contact 12 and the static contact 11 when being driven to open by the operating mechanism 3 is the first opening distance K1, and the second opening distance K2 is greater than the first opening distance K1.

[0064] By providing the opening distance locking device 5, when a short circuit current occurs in the circuit and the moving contact 12 is repelled, the moving contact 12 that is repelled to a longer distance is locked by the locking portion 52 to prevent the moving contact 12 from rebounding and resetting, so that the moving contact 12 and the static contact 11 maintain a second opening distance K2, and the second opening distance K2 is greater than the first opening distance K1 when the moving contact 12 and the static contact 11 are driven to open by the operating mechanism 3, thereby ensuring that the arc between the moving contact 12 and the static contact 11 is elongated and disconnected, thereby avoiding the reignition of the arc.

[0065] Alternatively, if Figure 3 and Figure 4 As shown, the contact assembly 1 further comprises a support 13, which is fixed to the base 8 by a plurality of screws. A mounting groove 131 is provided on the support 13, and the contact support 4 is disposed in the mounting groove 131 and can slide up and down in the mounting groove 131.

[0066] like Figure 5 As shown, a contact pressing groove 41 is provided at the lower end of the contact support 4, and the moving contact 12 is provided in the contact pressing groove 41, and the two ends of the moving contact 12 extend left and right to form two contact points respectively opposite to the two stationary contacts 11. When the contact support 4 moves downward, it presses the moving contact 12 downward to separate the moving contact 12 from the stationary contact 11.

[0067] like Figure 5 and Figure 6 As shown, in order for the movable contact 12 to automatically move upward and contact with the static contact 11 to close the switch after the operating mechanism 3 or the electromagnetic system 6 releases the pressure on the contact support 4, a fourth reset member 14 is provided between the movable contact 12 and the support 13, and the fourth reset member 14 can be specifically a compression spring. The compression spring applies an upward elastic force to the movable contact 12, and the elastic force is less than the pressure applied by the operating mechanism 3 and the electromagnetic system 6 to the contact support 4, so the movable contact 12 can overcome the elastic force of the fourth reset member 14 to open the switch; when the operating mechanism 3 or the electromagnetic system 6 releases the pressure on the contact support 4, the movable contact 12 moves upward under the elastic force of the fourth reset member 14 to contact with the static contact 11 to close the switch.

[0068] Combine the following Figure 5-Figure 7 The structure of the spacing locking device 5 is described in detail.

[0069] Optionally, the opening distance locking device 5 also includes a locking body 51, and a locking portion 52 is arranged on the locking body 51. One end of the locking body 51 is rotatably arranged, and the moving contact 12 presses against one side of the locking portion 52 to rotate the locking body 51, 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 presses against the other side of the locking portion 52, thereby achieving locking of the moving contact 12.

[0070] Specifically, the upper end of the locking body 51 is rotatably disposed on the support 13, and a rotation shaft 511 is disposed on the front side and the rear side of the locking body 51, and the locking body 51 is rotatably connected to the support 13 through the rotation shaft 511. The locking body 51 is provided with an avoidance hole 512, and the moving contact 12 passes through the avoidance hole 512 and can move up and down in the avoidance hole 512.

[0071] Optionally, the locking portion 52 is provided with a pressing inclined surface 521 , and when the moving contact 12 presses against the locking portion 52 , it slides along the pressing inclined surface 521 to drive the locking body 51 to rotate.

[0072] The locking portion 52 is configured as a locking protrusion, and the locking protrusion is provided with the above-mentioned pressing inclined surface 521, and a pressing protrusion 121 is correspondingly provided on the moving contact 12. When the moving contact 12 is repelled, the pressing protrusion 121 will abut against the pressing inclined surface 521, and the moving contact 12 will continue to move downward under the action of the repulsive force and slide along the pressing inclined surface 521, and push the locking body 51 to rotate until the pressing protrusion 121 moves to the lower side of the locking portion 52. The locking body 51 loses the pressing of the moving contact 12 and will rotate and reset, so that the locking portion 52 moves to the upper side of the locking protrusion, and the moving contact 12 is limited to prevent the moving contact 12 from rebounding and resetting under the action of the fourth reset member 14.

[0073] In order to realize the rotational reset of the locking body 51, Figure 5 As shown, the distance locking device 5 further includes a first reset member 53, which is disposed on one side of the locking body 51 where the locking portion 52 is disposed, and is used to apply a pulling force to the locking body 51 to rotate and reset the locking body 51. The first reset member 53 can be specifically an elastic band.

[0074] When only one locking body 51 is provided, one end of the first restoring member 53 can be fixed to the support 13 , and the other end can be connected to the locking body 51 , so that the first restoring member 53 can apply a pulling force to the locking body 51 .

[0075] In this embodiment, two locking bodies 51 are provided, and the two locking bodies 51 are arranged along the extension direction of the moving contact 12, that is, arranged along the left and right directions. The locking portion 52 is provided on the side of the locking body 51 facing the moving contact 12, and the two 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 locking portion 52, the first reset member 53 pulls the two locking bodies 51 at the same time, so that the two locking bodies 51 rotate in a direction close to each other. The locking body 51 is provided on the outer side of the support 13. When the locking body 51 abuts against the support 13 during the rotation process, it will stop rotating to prevent the locking body 51 from interfering with the contact support 4 during the rotation transition to the contact support 4, so that the contact support 4 cannot push the locking body 51 outward.

[0076] like Figure 5 As shown, in order to facilitate the installation of the first reset member 53, the locking body 51 is provided with a hook 513, and the first reset member 53 is hung on the hook 513. Specifically, the hook 513 is provided on the side of the locking body 51 away from the contact support 4, so as to facilitate the hanging installation of the first reset member 53.

[0077] Furthermore, the contact support 4 is arranged between the two locking bodies 51, and 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. When the switch is opened, the operating mechanism 3 drives the contact support 4 to be inserted between the two unlocking portions 54 to drive the locking body 51 to rotate so that the locking portion 52 is staggered with the moving contact 12. When the contact support 4 moves downward under the drive of the operating mechanism 3, it will be inserted between the unlocking portions 54 of the two locking bodies 51 to drive the locking body 51 to rotate so that the locking portion 52 avoids the pressing protrusion 121 on the moving contact 12, thereby releasing the limit on the moving contact 12, so that the moving contact 12 rebounds upward under the action of the fourth reset member 14 to abut against the contact support 4. The opening distance between the moving contact 12 and the static contact 11 is restored to the first opening distance K1.

[0078] Specifically, Figure 5 As shown, a driving inclined surface 541 is provided on one side of the unlocking portion 54 facing the contact support 4, and the driving inclined surface 541 gradually tilts toward the moving contact 12 from one end close to the contact support 4 to the other end, so that the contact support 4 can move downward along the driving inclined surface 541 to push the two locking bodies 51 outward. Optionally, matching 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, when the matching inclined surface 42 abuts against the driving inclined surface 541, the contact support 4 can drive the unlocking portion 54 more smoothly through surface-to-surface contact.

[0079] like Figure 8 and Fig. 9 As shown, the operating mechanism 3 includes a bracket 31, a gear 32, a connecting rod assembly 33 and a push rod 34. The gear 32 and the push rod 34 are rotatably arranged on the bracket 31. The gear 32 is connected to a handle (not shown in the figure) extending out of the base 8. The gear 32 can be driven to rotate by rotating the handle. One end of the connecting rod assembly 33 is connected to the gear 32, and the other end of the connecting rod assembly 33 is connected to the push rod 34. The rotation of the gear 32 can drive the push rod 34 to rotate through the connecting rod assembly 33. In the closed state, the push rod 34 releases the pressure on the top plate 2, that is, releases the pressure on the contact support 4, and the side of the push rod 34 facing the top plate 2 and the contact support 4 is set as a plane, and the plane maintains a preset angle α with the moving direction of the contact support 4.

[0080] When it is necessary to adjust the opening and closing of the switch through the operating mechanism 3, Figure 8 The figure shows a schematic diagram of the operating mechanism 3 in the off state. The handle is turned to drive the gear 32 to rotate, and the connecting rod assembly 33 drives the push rod 34 to rotate, so that the push rod 34 presses the top plate 2 downward, and the top plate 2 presses the contact support 4 to move downward, thereby driving the moving contact 12 to separate from the static contact 11. Fig. 9The figure shows a schematic diagram of the operating mechanism 3 in the closed state. When the handle is rotated in the reverse direction, the push rod 34 will be driven to rotate in the reverse direction to avoid the top plate 2, providing a space for the contact support 4 to move upward, so that the moving contact 12 can move upward to contact the static contact 11 to close the switch. In the closed state, by maintaining the lower side of the push rod 34 and the upper side of the contact support 4 at a preset angle α, the space that the push rod 34 can avoid can be optimized by designing the preset angle α, so that the layout of the operating mechanism 3, the top plate 2, the contact support 4 and other structures is more compact, which is more conducive to the miniaturization development trend of the switch electrical appliance.

[0081] Optionally, the preset angle α is set to 83°-97°, preferably 90°. In the closed state, the top rod 34 and the top plate 2 are substantially parallel, and such a setting can reserve a larger space for the top plate 2 to move upward.

[0082] Alternatively, if Fig. 9 As shown, the connecting rod assembly 33 includes a first connecting rod 331, a jumper 332, and a second connecting rod 333 that are rotatably connected in sequence, the first connecting rod 331 connects the gear 32 and the jumper 332, the second connecting rod 333 connects the jumper 332 and the top rod 34, and the jumper 332 selectively engages with the lock 9 of the switch. The connecting rod assembly 33 and the lock 9 can adopt various conventional structures of the switch in the prior art, which are not limited here.

[0083] Alternatively, if Fig. 9 As shown, the operating mechanism 3 also includes a third reset member 35, one end of which is arranged on the bracket 31, and the other end is rotatably connected to the top rod 34. In the open state, the third reset member 35 applies a rebound force to the top rod 34, so that the top rod 34 rotates in the opposite direction to press the top plate 2. The connection point between the third reset member 35 and the top rod 34 is located at the edge of one side of the top rod 34 facing the contact support 4 and the top plate 2. The third reset member 35 can be a torsion spring. In order to facilitate the installation of the third reset member 35, a spring installation hole 342 is provided on the top rod 34, and the end of the third reset member 35 is inserted into the spring installation hole 342 for connection and installation.

[0084] When closing the circuit breaker, the operating handle drives the gear 32 to rotate clockwise. The gear 32 carries the first connecting rod 331. The first connecting rod 331 drives the jumper 332 to deflect to the left. The top of the jumper 332 contacts and is restricted by the lock buckle 9. The jumper 332 rotates around the contact point with the lock buckle 9 under the push of the first connecting rod 331, pulling the second connecting rod 333 to move to the left. The second connecting rod 333 overcomes the force of the third reset member 35 to pull the push rod 34 to rotate upward, passing the dead point until the circuit breaker is closed. Fig. 9The state after the switch is closed, at this time, the lower side of the push rod 34 appears as a horizontal straight line, and is basically flush with the lower side of the bracket 31. When the operating mechanism 3 is disconnected, the handle pushes the gear 32 to rotate counterclockwise, driving the first connecting rod 331, the jumper 332, and the second connecting rod 333 to reset, and the push rod 34 moves downward under the action of the third reset member 35, pushing the top plate 2 to achieve the disconnection action. When a fault such as overload or short circuit occurs, the lock buckle 9 rotates to unlock the jumper 332, and the push rod 34 moves downward under the action of the third reset member 35 to achieve the disconnection action, while the second connecting rod 333 is driven by the push rod 34 to move, and the gear 32 rotates. When the lock buckle 9 is reset, the gear 32 is operated to perform the reset operation to achieve the reset, and the next step can be the normal connection and disconnection operation.

[0085] In the closed state, if Fig. 9 As shown, the end of the push rod 34 facing the third reset member 35 is set as a pressing end 341, and the pressing end 341 is used to press the top plate 2, and the pressing end 341 extends toward the third reset member 35 until a preset gap is maintained between the pressing end 341 and the third reset member 35 to prevent interference between the pressing end 341 and the third reset member 35, thereby ensuring that the push rod 34 can rotate normally.

[0086] Alternatively, if Fig. 9 As shown, the pressing end 341 is provided with a rounded corner to increase the structural strength and force-bearing surface of the pressing end 341 , thereby preventing the tip of the pressing end 341 from causing destructive damage to the top plate 2 .

[0087] Specifically, Fig. 9 As shown, the top rod 34 is set to a triangular structure. Taking the position of the top rod 34 in the closed state as an example, the lower left corner of the top rod 34 is rotatably connected to the bracket 31, the upper end corner of the top rod 34 is rotatably connected to the second connecting rod 333, and the third reset member 35 is connected to the lower right corner of the top rod 34. Under the premise of ensuring sufficient structural strength, the connection point between the third reset member 35 and the top rod 34 is as close as possible to the lower edge of the top rod 34, so that the top rod 34 has as large a clearance stroke as possible. At the same time, under the premise that the top rod 34 does not interfere with the third reset member 35, the length of the lower side of the top rod 34 is as large as possible, so that the pressing end 341 has as large an operating stroke as possible. In other words, the preset gap between the pressing end 341 and the third reset member 35 is set to a small gap to ensure that the two do not interfere with each other during operation.

[0088] Alternatively, if Fig.10 and Fig.11As shown, the top plate 2 is rotatably arranged, one end of the top plate 2 is arranged opposite to the contact support 4, and 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 against the contact support 4, so that the contact support 4 presses against the moving contact 12, so that the distance between the moving contact 12 and the static contact 11 is the third opening distance K3, and the third opening distance K3 is smaller than the second opening distance K2 by designing the stroke of the electromagnetic system 6. When the electromagnetic system 6 releases the force on the top plate 2, the top plate 2 rotates in the opposite direction, and the pressure on the contact support 4 is released, so that the contact support 4 can move upward, thereby causing the moving contact 12 to move upward and contact the static contact 11.

[0089] Specifically, the electromagnetic system 6 includes an electromagnet 61, a coil 62 and a second reset member 63. The second reset member 63 can be a spring. The top plate 2 is rotatably connected to the electromagnet 61. The top plate 2 includes a top pressure plate 21 and two connecting plates 22. The top pressure plate 21 is extended along the arrangement direction of the three contact supports 4 and is used to press the contact supports 4. The two connecting plates 22 are respectively arranged at both ends of the length direction of the top pressure plate 21. The connecting plates 22 are rotatably connected to the electromagnet 61, and the middle position of the connecting plates 22 is rotatably arranged on the housing of the electromagnetic system 6. The electromagnet 61 drives the connecting plates 22 to rotate and drives the top pressure plate 21 to move up and down.

[0090] like Fig.12 and Fig.13 The schematic diagram shows the state of the electromagnetic system 6 controlling the closing of the switch. When the switch is normally connected, the operating mechanism 3 is closed, the top rod 34 is lifted, and space is opened for the top pressure plate 21 to move upward; the electromagnet 61 is attracted to compress the second reset member 63, the top pressure plate 21 is lifted, and the moving contact 12 moves upward under the action of the fourth reset member 14, the moving contact 12 is connected with the static contact 11, and the product is energized.

[0091] like Fig.10 and Fig.11 The schematic diagram shows the state of the electromagnetic system 6 controlling the opening of the switch. When the switch is normally disconnected, the operating mechanism 3 is closed, and the top rod 34 is lifted to make room for the top pressure plate 21 to move. The electromagnet 61 releases the second reset member 63, the top plate 2 rotates clockwise, the top pressure plate 21 presses down the contact support 4, and the contact support 4 moves downward against the force of the fourth reset member 14, and the moving contact 12 leaves the static contact 11. The moving contact 12 and the static contact 11 are air-isolated to disconnect the product. At this time, the opening distance between the moving contact 12 and the static contact 11 is the third opening distance K3. Affected by the stroke of the electromagnet 61, the moving contact 12 is located above the locking portion 52 at this time, and the opening distance locking device 5 has no effect on the third opening distance K3.

[0092] Fig.14The schematic diagram of the switch opening when a short circuit occurs in the circuit is shown. When a large short circuit current occurs, a large electric repulsive force is generated, which will push the moving contact 12 to move away from the static contact 11, and the movement stroke exceeds the locking portion 52 of the opening distance locking device 5. As the short circuit current decreases, the electric repulsive force decreases, and the moving contact 12 moves upward under the action of the fourth reset member 14, and is locked at the lower side of the locking portion 52, and cannot continue to move upward. The moving contact 12 and the static contact 11 are maintained at the second opening distance K2, avoiding the distance between the moving contact 12 and the static contact 11 from decreasing. At this time, the operating mechanism 3 is in the process of tripping movement, the electromagnetic system 6 is also in the process of disconnecting movement, and the contact support 4 remains in the closed position. When the top rod 34 of the operating mechanism 3 moves downward to the bottom, i.e., the extreme position, it drives the contact support 4 to push the locking body 51 to swing outward, and the locking portion 52 on the locking body moves outward at the same time to unlock the moving contact 12. The moving contact 12 moves upward and is held in the disconnected position by the contact support 4, and the moving contact 12 and the static contact 11 are maintained at the second opening distance K2.

[0093] like Fig.15 and Fig.16 The schematic diagram of the operating mechanism disconnecting after tripping or opening is shown. When the operating mechanism 1 is tripped or opened, the top rod 34 rotates and presses down, and the top rod 34 presses the top pressure plate 21, so that the top pressure 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 static contact 11 reaches the second opening distance K2. Since the stroke of the operating mechanism 3 is greater than the action stroke of the electromagnet 61, the first opening distance K1 is greater than the third opening distance K3. At this time, the moving contact 12 is located in the middle part of the locking part 52 and is in an unlocked state. When the operating mechanism 3 is disconnected or opened, a release action signal will be sent to the electromagnetic system 6, so that the electromagnetic system 6 also starts the opening action to ensure the coordination of the actions of the operating mechanism 3 and the electromagnetic system 6. 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 downward freely without being affected by the electromagnet 61, and the action can be reflected immediately under the action of the downward force of the top rod 2.

[0094] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A switch device, characterized in that: include: A stationary contact (11) and a moving contact (12); An operating mechanism (3) and a contact support (4), wherein the operating mechanism (3) drives the moving contact (12) and the stationary contact (11) to open via the contact support (4), and the distance between the moving contact (12) and the stationary contact (11) when the moving contact (12) and the stationary contact (11) are driven to open by the operating mechanism (3) is a first opening distance K1; The opening distance locking device (5) is used to lock the moving contact (12) that is repelled by the short-circuit current. The opening distance locking device (5) comprises a locking portion (52). After being repelled, the moving contact (12) moves to the locking portion (52). The locking portion (52) is used to lock the moving contact (12) at a position where the distance from the stationary contact (11) is a second opening distance K2, and the second opening distance K2 is greater than the first opening distance K1.

2. The switch device according to claim 1, characterized in that: The opening distance locking device (5) also includes a locking body (51), the locking portion (52) is arranged on the locking body (51), one end of the locking body (51) is rotatably arranged, and the moving contact (12) presses against one side of the locking portion (52) to rotate the locking body (51), so that the moving contact (12) can continue to move toward the other side of the locking portion (52), and the locking body (51) can be rotated and reset to make the moving contact (12) press against the other side of the locking portion (52).

3. The switch device according to claim 2, characterized in that: The locking portion (52) is provided with a pressing inclined surface (521), and when the moving contact (12) presses against the locking portion (52), it slides along the pressing inclined surface (521) to drive the locking body (51) to rotate.

4. The switch device according to claim 2, characterized in that: The distance locking device (5) further comprises: A first restoring member (53) is arranged on a side of the locking body (51) where the locking portion (52) is arranged, and the first restoring member (53) is used to apply a pulling force to the locking body (51) so as to rotate and restore the locking body (51).

5. The switch device according to claim 4, characterized in that: Two locking bodies (51) are provided, and the two locking bodies (51) are arranged along the extension direction of the moving contact (12); the locking portion (52) is provided on a side of the locking body (51) facing the moving contact (12); and the two ends of the first reset member (53) are respectively connected to the two locking bodies (51).

6. The switch device according to claim 5, characterized in that: The contact support (4) is arranged between the two locking bodies (51); one end of the locking body (51) away from its rotation center 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 portions (54) to drive the locking body (51) to rotate so that the locking portion (52) and the moving contact (12) are offset.

7. The switch device according to claim 6, characterized in that: A driving inclined surface (541) is provided on one side of the unlocking portion (54) facing the contact support (4), and the driving inclined surface (541) gradually inclines towards the moving contact (12) from one end close to the contact support (4) to the other end.

8. The switch device according to any one of claims 1 to 7, characterized in that: The operating mechanism (3) comprises: Bracket (31); A gear (32) rotatably mounted on the bracket (31); A connecting rod assembly (33), one end of the connecting rod assembly (33) being connected to the gear (32); A push rod (34), wherein the push rod (34) is rotatably arranged on the bracket (31), the other end of the connecting rod assembly (33) is connected to the push rod (34), the rotation of the gear (32) can drive the push rod (34) to rotate through the connecting rod assembly (33), when in a closed state, the push rod (34) releases the pressure on the contact support (4), and the side of the push rod (34) facing the contact support (4) is arranged as a plane, and a preset angle α is maintained between the plane and the moving direction of the contact support (4).

9. The switch device according to claim 8, characterized in that: The preset angle α is set to 83°-97°.

10. The switch device according to claim 8, characterized in that: The operating mechanism (3) further comprises: A third reset member (35), one end of the third reset member (35) is arranged on the bracket (31), and the other end is rotatably connected to the push rod (34). In the open state, the third reset member (35) applies a rebound force to the push rod (34), so that the push rod (34) rotates in the opposite direction to press against the contact support (4). The connection point between the third reset member (35) and the push rod (34) is located at a side edge of the push rod (34) facing the contact support (4).

11. The switch device according to claim 10, characterized in that: In the closed state, the end of the push rod (34) facing the third reset member (35) is arranged as a pressing end (341), the pressing end (341) is used to press the contact support (4), and the pressing end (341) extends toward the third reset member (35) until a preset gap is maintained between the pressing end and the third reset member (35).

12. The switch device according to claim 11, characterized in that: The pressing end (341) is provided with a rounded corner.

13. The switch device according to any one of claims 1 to 7, characterized in that: The switch device also includes: Electromagnetic systems (6); A top plate (2), wherein the top plate (2) is rotatably arranged, one end of the top plate (2) is arranged opposite to the contact support (4), and the other end of the top plate (2) is connected to the electromagnetic system (6), and the electromagnetic system (6) can drive the top plate (2) to rotate so that one end of the top plate (2) presses against the contact support (4), so that the contact support (4) presses against the moving contact (12), so that the distance between the moving contact (12) and the static 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 in the opposite direction to release the pressure on the contact support (4).

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