Contact unit with arc extinguishing function and switching device

Abstract

The utility model discloses a contact unit with an arc extinguishing function and a switch device, the contact unit comprises a moving contact, a static contact, an execution member and an arc extinguishing assembly, and the moving contact is contacted with or separated from the static contact under the driving of the execution member; the arc extinguishing assembly comprises an arc extinguishing main body and an arc isolating piece linked with the executing piece, the arc isolating piece is located at an avoiding position or a separating position along with contact or separation of the moving contact and the static contact, and the moving contact and the static contact are physically separated by the arc isolating piece at the separating position; the arc isolating piece is used for avoiding the moving contact at the avoiding position; the arc extinguishing body is located on the side, away from the avoiding position, of the arc isolating piece at the separating position, and when the arc isolating piece moves towards the separating position, the arc is pushed to move towards the arc extinguishing body. According to the utility model, the electrical gap of the switch can be increased by using the arc-isolating piece, so that the overvoltage borne by the contacts is improved, active arc extinguishing can be realized, and the arc extinguishing effect is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, and in particular to a contact unit and switch device with arc extinguishing function. Background Technology

[0002] Switchgear is an electrical appliance used to connect or disconnect one or more circuits. Specific components can take the form of relays, disconnecting switches, contactors, circuit breakers, etc. The contact parts of these switchgear include moving contacts and stationary contacts. The moving contact and stationary contact make or separate, thus closing or opening the switch. When switches are used in high-voltage environments, they are required to have an arc-extinguishing structure to promptly extinguish the arc generated when the moving contact and stationary contact are separated. Existing arc-extinguishing structures typically employ passive arc-extinguishing methods, which have relatively poor arc-extinguishing effectiveness. Utility Model Content

[0003] This invention addresses the technical problems existing in the prior art by providing a contact unit and switching device with arc extinguishing function, which can achieve active arc extinguishing and greatly improve the arc extinguishing effect.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a contact unit with arc extinguishing function, including a moving contact, a stationary contact, an actuator, and an arc extinguishing assembly, wherein the moving contact contacts or separates from the stationary contact under the drive of the actuator; characterized in that: the arc extinguishing assembly includes an arc extinguishing body and an arc-isolating member linked to the actuator; as the moving contact contacts or separates from the stationary contact, the arc-isolating member is located in a clearance position or a separation position, and the arc-isolating member physically separates the moving contact from the stationary contact in the separation position, and avoids the moving contact in the clearance position; the arc extinguishing body is located on the side of the arc-isolating member away from the clearance position in the separation position, and when the arc-isolating member moves towards the separation position, it pushes the arc towards the arc extinguishing body.

[0005] In a preferred embodiment, the actuator and the arc-isolating member are rotatably disposed, and the arc-isolating member is driven to rotate by the actuator.

[0006] In a preferred embodiment, the arc-extinguishing body includes a plurality of arc-extinguishing grids spaced apart along the rotation direction of the arc-isolating member, and the side of the arc-extinguishing body facing the arc-isolating member is arranged in an arc shape along the rotation direction of the arc-isolating member.

[0007] In a preferred embodiment, a first permanent magnet is provided on the side of the arc-extinguishing body facing away from the arc-isolating member, a second permanent magnet is provided on one side of the arc-isolating member in the axial direction, and a third permanent magnet is provided on the other side of the arc-isolating member in the axial direction. The magnetic poles of the first permanent magnet facing the interior of the arc-extinguishing body and the magnetic poles of the second permanent magnet facing the interior of the arc-extinguishing body are opposite magnetic poles, and the magnetic poles of the third permanent magnet facing the interior of the arc-extinguishing body and the magnetic poles of the second permanent magnet facing the interior of the arc-extinguishing body are the same magnetic poles.

[0008] In a preferred embodiment, the actuator is connected to the arc-isolating member via a toothed transmission structure; the toothed transmission structure includes a first gear disposed on the actuator and a second gear disposed on the arc-isolating member, the first gear meshing with the second gear.

[0009] In a preferred embodiment, the actuator includes a contact support, a movable contact disposed on the contact support, and two stationary contacts. The movable contact rotates together with the contact support, such that both ends of the movable contact contact or separate from the two stationary contacts respectively. Two arc-extinguishing components are provided, and the arc-isolating elements of the two arc-extinguishing components correspond one-to-one with the two stationary contacts. The arc-isolating elements of the two arc-extinguishing components are driven by the contact support respectively.

[0010] In a preferred embodiment, the pivot point of the arc-isolating member is located on the side of the stationary contact opposite to the corresponding end of the moving contact; the stationary contact is provided with a cover plate, which separates the unextinguished arc from the stationary contact when the arc-isolating member is rotated to the separated position.

[0011] In a preferred embodiment, the arc-blocking member is a hollow cover structure, which covers the part of the stationary contact that mates with the moving contact at the spaced-out position; the arc-blocking member is fan-shaped, and one of the two sides where the central angle of the arc-blocking member is located is closed, while the other side is provided with an opening to allow the part of the stationary contact that mates with the moving contact to enter and exit.

[0012] In a preferred embodiment, the arc-blocking element is made of a gas-generating material, which includes one of nylon and POM plastic.

[0013] This utility model also provides a switching device, including at least one contact unit with arc extinguishing function as described above.

[0014] In a preferred embodiment, the device further includes a housing component, the arc extinguishing assembly and the switch are located inside the housing component, and the housing component is provided with an exhaust port leading to the outside, the exhaust port being located on the side of the arc extinguishing body opposite to the arc isolation member.

[0015] In a preferred embodiment, the device further includes a drive mechanism comprising a motor and a drive shaft, the drive shaft being driven to rotate by the motor and rotating in conjunction with the actuator.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The arc extinguishing assembly of this utility model includes an arc extinguishing body and an arc-isolating component linked to the actuator. As the moving contact and stationary contact come into contact or separate, the arc-isolating component is located in a clearance position or a separation position. In the separation position, the arc-isolating component physically separates the moving contact and the stationary contact. In the clearance position, the arc-isolating component avoids the moving contact. The arc extinguishing body is located on the side of the arc-isolating component away from the clearance position in the separation position. When the arc-isolating component moves towards the separation position, it pushes the arc towards the arc extinguishing body. This allows the utility model to increase the electrical clearance between the moving contact and the stationary contact using the arc-isolating component, thereby increasing the overvoltage that the contacts can withstand and greatly improving safety. On the other hand, it can also push the arc into the arc extinguishing body for arc extinguishing, thereby achieving active arc extinguishing and greatly improving the arc extinguishing effect.

[0018] 2. The arrangement of the first permanent magnet, the second permanent magnet, and the third permanent magnet enables this invention to achieve non-polar magnetic blow-by.

[0019] 3. The housing component is provided with the exhaust port, which can increase the pressure gradient and form high-pressure air blowing, thereby further improving the arc extinguishing effect.

[0020] 4. The drive mechanism includes a motor, which can utilize the motor's large stroke characteristics to achieve the large operating stroke requirements of the switch, thereby ensuring that the electrical distance of the contact unit in the open state meets the specified safe isolation distance.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the present invention is not limited to the embodiments provided. Attached Figure Description

[0022] Figure 1 This is an exploded view of the switching device of this utility model;

[0023] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0024] Figure 3 This is a three-dimensional structural diagram of the switching device of this utility model. Figure 1 (Reflecting on a local aspect)

[0025] Figure 4 This is a three-dimensional structural diagram of the switching device of this utility model. Figure 2 (Reflecting on a local aspect);

[0026] Figure 5 This is a three-dimensional structural diagram of the switching device of this utility model. Figure 3 (Reflecting on a local aspect);

[0027] Figure 6 This is a three-dimensional structural diagram of the first switch and the first energy storage component of this utility model in their combined state. Figure 1 ;

[0028] Figure 7 This is a three-dimensional structural diagram of the first switch and the first energy storage component of this utility model in their combined state. Figure 2 ;

[0029] Figure 8 This is a three-dimensional structural diagram of the switching device of this utility model. Figure 4 (Reflecting on a local aspect);

[0030] Figure 9 This is a three-dimensional structural schematic diagram of the arc-blocking component of this utility model;

[0031] Figure 10 This is a three-dimensional structural diagram of the switching device of this utility model. Figure 5 (Reflecting on a local aspect);

[0032] Figure 11 This is a schematic diagram of the first switch and the second switch of this utility model in the open state;

[0033] Figure 12 This is a schematic diagram of the drive mechanism of this utility model in the state of the first switch and the second switch being open;

[0034] Figure 13 This is a schematic diagram of the drive mechanism of this utility model during the closing process. Figure 1 ;

[0035] Figure 14 This is a schematic diagram of the drive mechanism of this utility model during the closing process. Figure 2 ;

[0036] Figure 15 This is a schematic diagram of the drive mechanism of this utility model during the closing process. Figure 3 ;

[0037] Figure 16 This is a schematic diagram of the drive mechanism of this utility model during the closing process. Figure 4 ;

[0038] Figure 17 This is a schematic diagram of the drive mechanism of this utility model in the state when the circuit is closed;

[0039] Figure 18This is a schematic diagram of the first switch and the second switch of this utility model in the closed state;

[0040] Figure 19 This is a schematic diagram of the drive mechanism of this utility model during the opening process. Figure 1 ;

[0041] Figure 20 This is a schematic diagram of the drive mechanism of this utility model during the opening process. Figure 2 ;

[0042] Figure 21 This is a schematic diagram of the drive mechanism of this utility model during the opening process. Figure 3 ;

[0043] Figure 22 This is a schematic diagram of the drive mechanism of this utility model during the opening process. Figure 4 ;

[0044] In the diagram, 1. First switch; 11. First moving contact portion; 111. First contact support; 112. First moving contact; 113. First gear; 13. First cam; 131. Second arc-shaped hole; 14. Cover plate; 12. First stationary contact; 2. Second switch; 21. Second moving contact portion; 211. First contact support; 212. Second moving contact; 23. Second cam; 24. Precharge pin; 3. Drive mechanism; 31. Motor; 32. Drive shaft; 321. Limiting protrusion; 322. First operating hole; 33. First drive wheel; 4. Second driving wheel; 341. Stroke groove; 35. First driven wheel; 351. First arc-shaped hole; 36. Second driven wheel; 37. First energy storage component; 371. Energy storage drive wheel; 372. Energy storage spring; 373. Movable rod; 374. Push rod; 375. Support; 38. Second energy storage component; 39. Gear transmission component; 4. Arc extinguishing body; 41. Arc extinguishing grid plate; 42. First permanent magnet; 43. Second permanent magnet; 44. Third permanent magnet; 5. Arc isolation component; 51. Second gear; 10. Housing component; 106. Exhaust port. Detailed Implementation

[0045] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. In this invention, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] Please see Figures 1-22 As shown, a switching device of this utility model includes at least one contact unit with arc-extinguishing function. The contact unit includes a moving contact, a stationary contact, an actuator, and an arc-extinguishing assembly. The moving contact contacts or separates from the stationary contact under the action of the actuator. The arc-extinguishing assembly includes an arc-extinguishing body 4 and an arc-isolating member 5 linked to the actuator. As the moving contact contacts or separates from the stationary contact, the arc-isolating member 5 is located in a clearance position or a separation position. In the separation position, the arc-isolating member 5 physically separates the moving contact from the stationary contact; in the clearance position, the arc-isolating member 5 avoids the moving contact. The arc-extinguishing body 4 is located on the side of the arc-isolating member 5 away from the clearance position in the separation position, and when the arc-isolating member 5 moves to the separation position, it pushes the arc towards the arc-extinguishing body 4. Therefore, this utility model can, on the one hand, increase the electrical gap between the moving contact and the stationary contact by using the arc-isolating component 5, thereby increasing the overvoltage that the contacts can withstand and thus greatly improving safety; on the other hand, it can use the arc-isolating component 5 to push the arc into the arc-extinguishing body 4 for arc extinguishing, thereby achieving active arc extinguishing and greatly improving the arc extinguishing effect.

[0047] In this embodiment, the actuator and the arc-blocking component 5 are rotatably arranged, and the arc-blocking component 5 is driven to rotate by the actuator. Specifically, the actuator is connected to the arc-blocking component 5 through a toothed transmission structure. The actuator specifically includes a contact support and a cam fixed coaxially. The moving contact is disposed on the contact support, and there are two stationary contacts. The moving contact rotates together with the contact support, so that the two ends of the moving contact contact or separate from the two stationary contacts respectively. There are two arc-extinguishing components, and the arc-blocking components 5 of the two arc-extinguishing components correspond one-to-one with the two stationary contacts, and the arc-blocking components 5 of the two arc-extinguishing components are respectively driven by the contact support. This utility model also includes a drive mechanism 3, which includes a motor 31 and a drive shaft 32. The drive shaft 32 is driven to rotate by the motor 31 and rotates in conjunction with the actuator to close or open the switch.

[0048] like Figure 3 As shown, the arc-extinguishing body 4 includes multiple arc-extinguishing grid plates 41 spaced apart along the rotation direction of the arc-isolating member 5. The side of the arc-extinguishing body 4 facing the arc-isolating member 5 is arranged in an arc shape along the rotation direction of the arc-isolating member 5. On the side of the arc-extinguishing body 4 facing away from the arc-isolating member 5, and on both sides of the arc-isolating member 5 in the axial direction, positions for optional permanent magnets are respectively provided to achieve non-polar magnetic blowout. Specifically, a first permanent magnet 42 is provided on the side of the arc-extinguishing body 4 facing away from the arc-isolating member 5, a second permanent magnet 43 is provided on one side of the arc-isolating body 4 in the axial direction of the arc-isolating member 5, and a third permanent magnet 44 is provided on the other side of the arc-isolating body 4 in the axial direction of the arc-isolating member 5. The magnetic poles of the first permanent magnet 42 facing into the arc-extinguishing body 4 and the magnetic poles of the second permanent magnet 43 facing into the arc-extinguishing body 4 are opposite magnetic poles, while the magnetic poles of the third permanent magnet 44 facing into the arc-extinguishing body 4 and the magnetic poles of the second permanent magnet 43 facing into the arc-extinguishing body 4 are the same magnetic poles.

[0049] This utility model also includes a housing component 10, with the contact unit and drive mechanism 3 disposed inside the housing component 10. The housing component 10 has an exhaust port 106 leading to the outside, which is located on the side of the arc-extinguishing body 4 opposite to the arc-isolating member 5. Figure 10 As shown, this is used to increase the pressure gradient and create high-pressure airflow.

[0050] In this embodiment, multiple contact units are provided, including contact units with arc-extinguishing function and contact units without arc-extinguishing function. For ease of distinction, the contact unit with arc-extinguishing function is referred to as the first contact unit, and the contact unit without arc-extinguishing function is referred to as the second contact unit. The first contact unit 1 and the second contact unit 2 are arranged side by side and connected in series. In this embodiment, there are two first contact units 1, which are linked together to open and close synchronously. For ease of distinction, the components of the first contact unit 1 are referred to as the first moving contact 112, the first stationary contact 12, the first contact support 111, and the first cam 13; the components of the second contact unit 2 are referred to as the second moving contact 212, the second stationary contact 22, the second contact support 111, and the second cam 23. The first moving contact 112 and the actuator of the first contact unit 1 are collectively referred to as the first moving contact part 11, and the second moving contact 212 and the actuator of the second contact unit 2 are collectively referred to as the second moving contact part 21. The two second stationary contacts 22 of the second contact unit 2 are each provided with a pre-charge pin 24. One of the second stationary contacts 22 of the second contact unit 2 is integrally formed or electrically connected to one of the first stationary contacts 12 of the first contact unit 1, forming a common part. In this way, the first contact unit 1 and the second contact unit 2 are connected in series. The first contact unit 1 and the second contact unit 2 are controlled by the drive mechanism 3 to realize synchronous opening and closing or sequential opening and closing.

[0051] In this embodiment, the toothed transmission structure includes a first gear 113 disposed on the first contact support 111 and a second gear 51 disposed on the arc-isolating member 5, wherein the first gear 113 meshes with the second gear 51.

[0052] like Figure 9As shown, the arc-blocking component 5 is a hollow cover structure that encloses the portion of the first stationary contact 12 that mates with the first moving contact 112 at a separated position. The rotation fulcrum of the arc-blocking component 5 is located on the side of the first stationary contact 12 opposite to the corresponding end of the first moving contact, and its appearance is roughly fan-shaped. One side of the two sides containing the central angle is closed, while the other side has an opening 52 to facilitate the entry and exit of the first stationary contact 12 into and out of the arc-blocking component 5. During the disconnection process between the first moving contact 112 and the first stationary contact 12 in the first contact unit 1, the arc-blocking component 5 rotates synchronously, gradually separating the first moving contact 112 from the first stationary contact 12, and simultaneously pushing the arc between the contacts toward the arc-extinguishing body 4, cutting the arc into short arcs, which helps to extinguish the arc quickly. The arc-blocking component 5 can use a gas-generating material, including one of nylon, POM plastic, etc., and the generated gas can more easily propel the arc to move quickly. In order to prevent the unextinguished arc from conducting with the adjacent first stationary contact 12 after the first moving contact 112 of the first contact unit 1 has disconnected from the first stationary contact 12, a cover plate 14 has been added to the first stationary contact 12, thereby increasing the arc path.

[0053] In this embodiment, the drive mechanism 3 further includes a first drive wheel 33 for linking the opening and closing of the first contact unit 1 and a second drive wheel 34 for linking the opening and closing of the second contact unit 2. The first drive wheel 33 is coaxially fixed together with the drive shaft 32, and the second drive wheel 34 is sleeved outside the drive shaft 32, with a free stroke between it and the first drive wheel 33 and / or the drive shaft 32, so that the second drive wheel 34 rotates later than the first drive wheel 33, thereby realizing the sequential closing or sequential opening of the first contact unit 1 and the second contact unit 2. Specifically, the inner hole of the second drive wheel 34 is provided with a stroke groove 341, and the first drive wheel 33 and / or the drive shaft 32 are provided with a limiting protrusion 321 corresponding to the stroke groove 341. The limiting protrusion 321 rotatably engages within the stroke groove 341, and the free stroke is realized by the movement of the limiting protrusion 321 between the two ends of the circumferential direction of the stroke groove 341. In this embodiment, there are two stroke grooves 341, which are arranged opposite to each other, but it is not limited to this.

[0054] The drive mechanism 3 also includes a first driven wheel 35 and a second driven wheel 36. The first driving wheel 33 is drive-connected to the first driven wheel 35, causing the first driven wheel 35 to rotate and drive the first contact unit 1 to close or open. The second driving wheel 34 is drive-connected to the second driven wheel 36, causing the second driven wheel 36 to rotate and drive the second contact unit 2 to close or open. Specifically, in this embodiment, the first driving wheel 33, the second driving wheel 34, the first driven wheel 35, and the second driven wheel 36 are gears. The first driving wheel 33 meshes with the first driven wheel 35, and the second driving wheel 34 meshes with the second driven wheel 36.

[0055] The drive mechanism 3 also includes a first energy storage component 37 and a second energy storage component 38. The first driven wheel 35 stores energy by rotating in conjunction with the first energy storage component 37, and the first energy storage component 37 drives the first contact unit 1 to close or open by releasing the stored energy. The second driven wheel 36 stores energy by rotating in conjunction with the second energy storage component 38, and the second energy storage component 38 drives the second contact unit 2 to close or open by releasing the stored energy. This achieves instantaneous connection and disconnection of the first contact unit 1 and the second contact unit 2, avoiding the adverse effects of long contact arc burning time caused by the slow operating speed of the motor 31.

[0056] The first energy storage component 37 is disposed between the first driven wheel 35 and the first cam 13 of the first moving contact portion 11, and has a free stroke between the first driven wheel 35 and the first cam 13 respectively; the second energy storage component 38 is disposed between the second driven wheel 36 and the second cam 13 of the second moving contact portion 21, and has a free stroke between the second driven wheel 36 and the second moving contact portion 21 respectively.

[0057] like Figure 6 , Figure 7 As shown, the first energy storage component 37 specifically includes an energy storage drive wheel 371 and at least one movable component. The movable component includes a movable rod 373, a push rod 374, and an energy storage spring 372. The energy storage drive wheel 371 is located between the first driven wheel 35 and the first cam, and the energy storage drive wheel 371, the first driven wheel 35, and the first cam 13 are all on the same axis. The first driven wheel 35 has a first arc-shaped hole 351 concentrically arranged with the movable component corresponding to the first driven wheel 35. The first cam 13 has a first arc-shaped hole 351 concentrically arranged with the movable component corresponding to the first cam 13. A second arc-shaped hole 131 is provided, and a push rod 374 is provided on the energy storage drive wheel 371. One end of the push rod 374 is adapted to slide into the first arc-shaped hole 351 of the first driven wheel 35, and the other end of the push rod 374 is adapted to slide into the second arc-shaped hole 131 of the first cam 13. A movable rod 373 is rotatably and slidably provided on a support 375 located outside the energy storage drive wheel 371, and one end of the movable rod 373 is movably connected to the push rod 374. An energy storage spring 372 is fitted onto the movable rod 373 and cooperates between the push rod 374 and the support 375. In this embodiment, there are two movable parts, which are located on opposite sides of the energy storage drive wheel 371. Correspondingly, there are two first arc-shaped holes 351 and two second arc-shaped holes 131. Therefore, when the first driven wheel 35 rotates, it drives the energy storage drive wheel 371 to rotate, causing the energy storage spring 372 to store energy. When the energy storage spring 372 releases the stored energy, it drives the first cam 13 to rotate, thereby causing the first contact unit 1 to close or open, that is, to make the first moving contact part 11 contact or separate from the stationary contact part. The structure of the second energy storage component 38 is the same as or basically the same as the structure of the first energy storage component 37, and will not be described again here.

[0058] This invention discloses a switching device applicable to an energy storage system. The charging and discharging circuit of the energy storage system includes a main circuit and a pre-charging circuit. The main circuit includes a main positive branch and a main negative branch. In application, the other first stationary contact 12 of one of the first contact units 1 and the other second stationary contact 22 of the second contact unit 2 are connected to the main positive branch. The two first stationary contacts 12 of the other first contact unit 1 are connected to the main negative branch. The two pre-charging pins 24 of the second contact unit 2 are respectively connected to the two ends of the pre-charging circuit.

[0059] The initial state of this utility model is as follows: Figure 11 , Figure 12 As shown, at this time, the first moving contact 112 is separated from the two first stationary contacts 12, the second moving contact 212 is separated from the two second stationary contacts 22, and the arc blocking member 5 is blocked between the first moving contact 112 and the first stationary contact 12.

[0060] When the main circuit needs to be closed, motor 31 is started. Motor 31 drives the drive shaft 32 and the first drive wheel 33 to rotate in the direction that closes the first contact unit 1 through gear transmission assembly 39. The first drive wheel 33 drives the first driven wheel 35 to rotate in the direction that closes the first contact unit 1, so that the first energy storage component 37 gradually stores energy. Figure 13 As shown; during this process, since there is a free stroke between the second driving wheel 34 and the first driving wheel 33, the second driving wheel 34 does not rotate.

[0061] When the energy storage spring 372 of the first energy storage component 37 reaches the dead point position (i.e., the position where the energy storage spring 372 is about to release the stored energy), the first drive wheel 33 also completes its idle stroke relative to the second drive wheel 34, causing its limiting protrusion 321 to abut against one end of the stroke groove 341 of the second drive wheel 34 in the circumferential direction. Figure 14 As shown, as the first driving wheel 33 continues to rotate, the energy storage spring 372 of the first energy storage component 37 releases its stored energy, causing the first moving contact portion 11 to rotate rapidly until both ends of the first moving contact 112 contact the two first stationary contacts 12 respectively, thus closing the first contact unit 1. During the rotation of the first moving contact portion 11, the arc-blocking member 5 rotates in the opposite direction, exposing the portion of the first stationary contact 12 that is used to cooperate with the first moving contact 112, so as to facilitate contact with the first moving contact 112. Figure 15 As shown. During this process, the second drive wheel 34 also rotates under the drive of the first drive wheel 33, causing the second energy storage component 38 to gradually store energy. However, the rotation of the second drive wheel 34 is insufficient to make the energy storage spring of the second energy storage component 38 reach the dead point position. After the first contact unit 1 closes, the motor 31 stops running, causing the drive shaft 32 and its first drive wheel 33 and second drive wheel 34 to stop rotating.

[0062] After the first contact unit 1 closes, the pre-charging circuit is activated. The pre-charging circuit charges the capacitive or near-capacitive load through the pre-charging resistor R1. When the current drops to a certain level, the battery management system detects that the voltage difference of the battery pack has reached equilibrium. The motor 31 then runs again, driving the drive wheel and its first drive wheel 33 and second drive wheel 34 to continue rotating in the direction that caused the first contact unit 1 to close, until the energy storage spring of the second energy storage component 38 reaches its dead position. Figure 16 As shown, as the second driving wheel 34 continues to rotate, the energy storage spring of the second energy storage component 38 releases its stored energy, causing the second moving contact 212 portion 21 to rotate rapidly until both ends of the second moving contact 212 contact the two second stationary contacts 22 respectively, thus closing the second contact unit 2. Figure 17 , Figure 18 As shown, this causes the pre-charging circuit to short-circuit, and the main circuit enters the normal operating state. During this process, since there is a free stroke between the first drive wheel 33 and the first energy storage component 37, the rotation of the first drive wheel 33 will not affect the state of the first contact unit 1, that is, the first contact unit 1 remains in the closed state.

[0063] When the main circuit needs to be disconnected, motor 31 is started. Motor 31 drives the drive shaft 32 and the first drive wheel 33 to rotate in the direction that disconnects the first contact unit 1 through gear transmission assembly 39. The first drive wheel 33 drives the first driven wheel 35 to rotate in the direction that disconnects the first contact unit 1, so that the first energy storage component 37 gradually stores energy. Figure 19 As shown; during this process, since there is a free stroke between the second driving wheel 34 and the first driving wheel 33, the second driving wheel 34 does not rotate.

[0064] When the energy storage spring 372 of the first energy storage component 37 reaches its dead position, the first drive wheel 33 also completes its idle stroke relative to the second drive wheel 34, causing its limiting protrusion 321 to abut against one end of the circumferential stroke groove 341 of the second drive wheel 34. Figure 20 As shown, as the first driving wheel 33 continues to rotate, the energy storage spring 372 of the first energy storage component 37 releases its stored energy, causing the first moving contact portion 11 to rotate rapidly until both ends of the first moving contact 112 separate from the two first stationary contacts 12, thus disconnecting the first contact unit 1 and thereby disconnecting the main circuit. During the rotation of the first moving contact portion 11, the arc-blocking member 5 rotates in the opposite direction until it separates the first stationary contact 12 from the first moving contact 112, as shown. Figure 21 As shown. During this process, the second drive wheel 34 also rotates under the drive of the first drive wheel 33, causing the second energy storage component 38 to gradually store energy. However, the rotation of the second drive wheel 34 is insufficient to make the energy storage spring of the second energy storage component 38 reach the dead point position.

[0065] When the energy storage spring of the second energy storage component 38 reaches the dead point position (e.g.) Figure 22 As shown, as the second driving wheel 34 continues to rotate, the second energy storage component 38 releases stored energy, causing the second moving contact 212 portion 21 to rotate rapidly until both ends of the second moving contact 212 separate from the two second stationary contacts 22, thus disconnecting the second contact unit 2 and canceling the short-circuit pre-charge circuit. At this time, the entire switching device returns to normal. Figure 11 , Figure 12 The initial state is shown. During this process, since there is no idle stroke between the first drive wheel 33 and the first energy storage component 37, the rotation of the first drive wheel 33 will not affect the state of the first contact unit 1, that is, the first contact unit 1 remains in the open state.

[0066] The present invention relates to a contact unit and a switch device with arc extinguishing function. The parts not described herein are the same as or can be implemented using existing technology.

[0067] The above embodiments are only used to further illustrate a contact unit and switching device with arc extinguishing function of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A contact unit with arc extinguishing function, comprising a moving contact, a stationary contact, an actuator and an arc extinguishing assembly, the moving contact is contacted or separated with the stationary contact under the driving of the actuator; characterized in that: The arc extinguishing assembly comprises an arc extinguishing main body and an arc separating piece arranged in linkage with the actuator, the arc separating piece being in a avoiding position or a separating position as the moving contact and the stationary contact are in contact or separated, the arc separating piece physically separating the moving contact and the stationary contact in the separating position, the arc separating piece avoiding the moving contact in the avoiding position; the arc extinguishing main body is located on the side of the arc separating piece away from the avoiding position in the separating position, and the arc separating piece pushes the electric arc to move towards the arc extinguishing main body when moving to the separating position.

2. The contact unit with arc extinguishing function according to claim 1, characterized in that: The actuator and the arc separating piece are respectively arranged in rotation, and the arc separating piece is driven to rotate by the actuator.

3. The contact unit with arc extinguishing function according to claim 2, characterized in that: The arc extinguishing main body comprises a plurality of arc extinguishing fins distributed at intervals along the rotation direction of the arc separating piece, and the side of the arc extinguishing main body facing the arc separating piece is arranged in an arc shape along the rotation direction of the arc separating piece.

4. The contact unit with arc extinguishing function according to claim 2 or 3, characterized in that: The side of the arc extinguishing main body opposite to the arc separating piece is provided with a first permanent magnet, one side of the arc extinguishing main body in the axial direction of the arc separating piece is provided with a second permanent magnet, and the other side of the arc extinguishing main body in the axial direction of the arc separating piece is provided with a third permanent magnet, the magnetic pole of the first permanent magnet towards the inside of the arc extinguishing main body and the magnetic pole of the second permanent magnet towards the inside of the arc extinguishing main body are opposite poles, and the magnetic pole of the third permanent magnet towards the inside of the arc extinguishing main body and the magnetic pole of the second permanent magnet towards the inside of the arc extinguishing main body are same poles.

5. The contact unit with arc extinguishing function according to claim 2, characterized in that: The actuator is in transmission connection with the arc separating piece through a toothed transmission structure; the toothed transmission structure comprises a first gear arranged on the actuator and a second gear arranged on the arc separating piece, and the first gear is in meshing connection with the second gear.

6. The contact unit with arc extinguishing function according to claim 2 or 5, characterized in that: The actuator comprises a contact support, the moving contact is arranged on the contact support, the stationary contact is provided with two, the moving contact rotates with the contact support, and the two ends of the moving contact are respectively in contact or separated from the two stationary contacts; the arc extinguishing assembly is provided with two, the arc separating pieces of the two arc extinguishing assemblies correspond to the two stationary contacts one by one, and the arc separating pieces of the two arc extinguishing assemblies are respectively driven by the contact support.

7. The contact unit with arc extinguishing function according to claim 2, characterized in that: The rotation fulcrum of the arc separating piece is located on the side of the corresponding end of the stationary contact opposite to the moving contact; the stationary contact is provided with a cover plate, and the cover plate separates the unextinguished electric arc from the stationary contact when the arc separating piece rotates to the separating position.

8. The contact unit with arc extinguishing function according to claim 2 or 7, characterized in that: The arc separating piece is a hollow cover structure, and the arc separating piece surrounds the stationary contact in the separating position for cooperation with the moving contact; the arc separating piece is in the shape of a sector, and one of the two sides of the central angle of the arc separating piece is in a closed form, and the other side is provided with an opening for the part of the stationary contact for the moving contact to enter and exit.

9. The contact unit with arc extinguishing function according to claim 1, characterized in that: The arc separating piece is made of a gas generating material, and the gas generating material comprises one of nylon and POM plastic.

10. A switching device characterized by: The contact unit with arc extinguishing function comprises at least one contact unit with arc extinguishing function according to any one of claims 1-9.

11. The switching device of claim 10, wherein: The arc extinguishing assembly and the switch are located in the housing component, and the housing component is provided with an exhaust hole leading to the outside, and the exhaust hole is located on the side of the arc extinguishing main body opposite to the arc separating piece.

12. The switching device of claim 10, wherein: The driving mechanism comprises a motor and a driving shaft, the driving shaft is driven to rotate by the motor, and the driving shaft drives the actuator to rotate.

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