Switching device

Abstract

A switch device comprises a shell, an operating mechanism and at least one switch unit, the operating mechanism and the switch unit are arranged in the shell, each switch unit comprises a contact mechanism and an arc extinguishing mechanism, the contact mechanism comprises a moving contact, a static contact and a contact support, the moving contact is arranged on the contact support, and the operating mechanism can drive the contact support to rotate. The moving contact and the static contact are driven by the contact support to be contacted and separated, the first protective cover is rotationally arranged, the first spring is connected with the first protective cover, the first spring is used for driving the first protective cover to shield the static contact, and when the contact support drives the moving contact to move close to the static contact, the first protective cover is connected with the first spring. The first protective cover can be pushed to be away from the static contact and the first spring is locked in the energy storage state, when the contact support drives the moving contact to be separated from the static contact, the first spring drives the first protective cover to shield the static contact, the structure is simple, the number of parts is small, and the fixed static contact makes more reliable contact with the moving contact.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a switching device. Background Technology

[0002] Modern power systems place higher demands on the breaking capacity and safety protection of switchgear. In DC applications, because the current lacks a natural zero-crossing characteristic, the arc cannot be extinguished instantaneously at the zero-crossing point like AC current; instead, it must rely on rapid elongation and cooling of the arc. The arc generated during DC current interruption is characterized by its high persistence and high energy density. Furthermore, due to the limited opening distance, breakdown between the moving and stationary contacts is prone to occur, leading to arc extinguishing failure. This poses a severe challenge to the design of arc extinguishing systems.

[0003] Traditional switchgear typically uses an independent drive mechanism to control the protective cover to shield the moving and stationary contacts. This not only results in a large number of parts and poor motion coordination, but also the drive mechanism and the contact operating mechanism are separate motion systems, which can easily lead to the contact shielding timing being out of sync with the opening and closing operations. In switchgear equipped with main contacts and arc contacts, traditional protective covers cannot dynamically adapt to the action sequence of the main contacts and arc contacts during disconnection, and cannot accurately isolate the moving and stationary contacts during disconnection. Utility Model Content

[0004] The purpose of this utility model is to overcome at least one defect of the prior art and provide a switching device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A switching device includes a housing, an operating mechanism, and at least one switching unit disposed within the housing. The switching unit includes a contact mechanism and an arc-extinguishing mechanism. The contact mechanism includes a moving contact, a stationary contact, and a contact support. The moving contact is disposed on the contact support. The operating mechanism can drive the contact support to rotate, thereby causing the moving contact to contact and separate from the stationary contact.

[0007] It also includes a first protective cover that is rotatably mounted, and a first spring connected to the first protective cover. The first spring is used to drive the first protective cover to block the stationary contact. When the contact supports moving the moving contact closer to the stationary contact, it can push the first protective cover away from the stationary contact and lock the first spring in an energy storage state. When the contact supports moving the moving contact and separating from the stationary contact, the first spring drives the first protective cover to block the stationary contact.

[0008] Preferably, the contact support is provided with a second protective cover, which is located on the side of the moving contact near the stationary contact. When the contact support moves the moving contact closer to the stationary contact, the second protective cover pushes the first protective cover away from the stationary contact and locks the first spring in an energy storage state. When the contact support moves the moving contact away from the stationary contact, it moves the second protective cover away from the first protective cover.

[0009] Preferably, the second protective cover is fixedly mounted on the contact support. The second protective cover has an arc-shaped protective surface, and the middle part of the protective surface protrudes to the side away from the contact support. When the moving contact moves close to the stationary contact, the second protective cover pushes the first protective cover through the protective surface.

[0010] Preferably, the second protective cover is rotatably mounted on the contact support. The second protective cover has a guide protrusion and a guide groove that mates with the guide protrusion inside the housing. When the second protective cover moves with the contact support, it drives the guide protrusion to slide in the guide groove and pushes the guide protrusion through the guide groove, so that the second protective cover rotates relative to the contact support. When the moving contact contacts the stationary contact, the second protective cover moves away from the moving contact, and when the moving contact separates from the stationary contact, the second protective cover blocks the moving contact.

[0011] Preferably, the first protective cover includes two rotatably mounted shielding side plates and a shielding top plate connected between the two shielding side plates. The shielding top plate rotates around the rotation centerline of the shielding side plates, and shields and exposes the stationary contact through the shielding top plate.

[0012] Preferably, the arc extinguishing mechanism includes a first arc extinguishing chamber and a second arc extinguishing chamber. The first arc extinguishing chamber is disposed on the side of the moving contact and the stationary contact along the length direction of the switchgear. The second arc extinguishing chamber is disposed on the side of the stationary contact away from the moving contact along the height direction of the switchgear. The first arc extinguishing chamber is provided with a plurality of first grid plates arranged along the height direction of the switchgear, and the second arc extinguishing chamber is provided with a plurality of second grid plates arranged along the length direction of the switchgear.

[0013] Preferably, the second arc-extinguishing chamber includes an arc-extinguishing shell, a second grid plate is disposed in the arc-extinguishing shell, and the first protective cover has two shielding side plates disposed opposite to each other on both sides of the arc-extinguishing shell, and a shielding top plate connected between the two shielding side plates. The two shielding side plates are respectively rotatably connected to the arc-extinguishing shell.

[0014] Preferably, each of the two shielding side plates is provided with a spring shaft connected to a first spring. The first spring includes two spring helical portions corresponding to the two shielding side plates respectively, and a spring connecting portion connected between the two spring helical portions. The ends of the two spring helical portions away from the spring connecting portion are respectively provided with spring action portions. The arc extinguishing housing is provided with a connecting hole. The two shielding side plates are provided with connecting shafts. The connecting shafts are inserted into the corresponding connecting holes for rotatable connection. The two spring helical portions are respectively sleeved on the connecting shafts of the corresponding shielding side plates. The spring connecting portions abut against the arc extinguishing housing. The two spring action portions abut against the spring shafts of the corresponding shielding side plates respectively.

[0015] Preferably, the arc extinguishing mechanism further includes a first arc-initiating plate and a second arc-initiating plate. The first arc-initiating plate is connected between the first arc-extinguishing chamber and the second arc-extinguishing chamber. The two ends of the first arc-initiating plate are respectively provided with a first front arc-initiating portion and a first rear arc-initiating portion, which are located in the first arc-extinguishing chamber and the second arc-extinguishing chamber, respectively. The second arc-initiating plate is connected to the stationary contact and is bent and extended into the second arc-extinguishing chamber. The two ends of the second arc-initiating plate are respectively provided with a second front arc-initiating portion and a second rear arc-initiating portion. The first rear arc-initiating portion and the second rear arc-initiating portion are arranged opposite to each other at both ends of the second arc-extinguishing chamber. The first front arc-initiating portion and the second front arc-initiating portion are arranged in the first arc-extinguishing chamber at one end closer to the second arc-extinguishing chamber. The second front arc-initiating portion cooperates with the stationary contact. The second front arc-initiating portion and the first front arc-initiating portion are spaced apart and form a second arc-initiating channel communicating with the second arc-extinguishing chamber.

[0016] Preferably, the stationary contact includes a stationary conductive plate and a first stationary contact portion and a second stationary contact portion respectively disposed on the side of the stationary conductive plate. The stationary contact is fixedly mounted on the arc-extinguishing housing. The stationary conductive plate has an arc-starting through hole in the middle. The arc-extinguishing housing has an arc-extinguishing housing through hole corresponding to the arc-starting through hole. The second stationary contact portion is located between the first stationary contact portion and the arc-starting through hole. The first arc-starting piece and the second arc-starting piece pass through the arc-starting through hole and the arc-extinguishing housing through hole. The second front arc-starting portion of the first arc-starting piece cooperates with the second stationary contact portion. When the moving contact and the stationary contact are separated, the first protective cover at least blocks the first stationary contact portion.

[0017] Preferably, the second front arc-leading part cooperates with the second static contact part. The second front arc-leading part includes two arc-leading mounting parts spaced apart, and arc-leading connecting parts respectively connected to the two arc-leading mounting parts. The two arc-leading mounting parts are respectively connected to the static conductive plate by screws, and the second static contact part is located between the two arc-leading mounting parts.

[0018] Preferably, the static conductive plate is provided with a third protective cover. The third protective cover, the first static contact portion, and the second static contact portion are arranged on the same plane. The third protective cover is located on one side of the first static contact portion. A first protective through hole and a second protective through hole are provided in the middle of the third protective cover. The first protective through hole corresponds to the second static contact portion and is used to fit around the second static contact portion and the outside of the first front arc-starting portion of the first arc-starting piece. The second protective through hole corresponds to the arc-starting through hole on the static conductive plate and is used to pass through the first arc-starting piece and the second arc-starting piece.

[0019] Preferably, the second protective through hole of the third protective cover is provided with a protective insert plate, which is used to be inserted into the arc-starting through hole of the static conductive plate, and the side of the third protective cover is provided with a raised third rib.

[0020] Preferably, the moving contact includes a first moving contact corresponding to the first stationary contact and a second moving contact corresponding to the second stationary contact. The distance from the second moving contact to the contact support rotation center is greater than the distance from the first moving contact to the contact support rotation center. When the switchgear is closed, the second moving contact can contact the second stationary contact before the first moving contact and the first stationary contact, and the second moving contact can separate from the second stationary contact after the first moving contact and the first stationary contact have made contact. When the switchgear is opened, the second moving contact separates from the second stationary contact after the first moving contact and the first stationary contact have separated, and pulls the arc toward the first arc-extinguishing chamber of the arc-extinguishing mechanism.

[0021] Preferably, the contact support is provided with multiple movable conductive plates, each of which is provided with a movable contact. A contact partition is provided between two adjacent movable conductive plates. The contact partition is connected to the contact support, and the protective surface of the second protective cover is fixedly connected to the multiple contact partitions.

[0022] Preferably, the top shielding plate and the side shielding plate are inclined, the top shielding plate is arc-shaped, and the middle part of the top shielding plate protrudes towards the side near the contact support. The second protective cover pushes the top shielding plate to rotate around the rotation centerline of the side shielding plate, thereby shielding and exposing the stationary contact.

[0023] Preferably, the top shielding plate is provided with a shielding groove recessed towards the side away from the contact support, the shielding groove is provided with a first rib, the first rib is arranged parallel to the rotation axis of the shielding side plate, and the shielding side plate is provided with a second rib.

[0024] Preferably, the two sides of the shielding side plates are respectively provided with a first extension and a second extension. One end of the shielding top plate is connected between the first extensions of the two shielding side plates, and the end of the shielding top plate away from the first extension is connected between the second extensions of the two shielding side plates, so that the shielding top plate and the shielding side plates are inclined. The shielding top plate includes a first shielding surface, a second shielding surface, a third shielding surface and a fourth shielding surface. One end of the second shielding surface and one end of the third shielding surface are connected to form a shielding groove. The end of the second shielding surface away from the third shielding surface is connected to the first shielding surface. The first shielding surface is connected between the first extensions of the two shielding side plates. The end of the third shielding surface away from the second shielding surface is connected to the fourth shielding surface. The fourth shielding surface is connected between the second extensions of the two shielding side plates. During the process of the contact support driving the moving contact to contact the stationary contact, the second protective cover first pushes the fourth shielding surface to make the first protective cover rotate. Then the second protective cover separates from the fourth shielding surface and pushes the first shielding surface to make the first protective cover rotate.

[0025] In this embodiment of the switching device, when the circuit is open, the first protective cover is driven by the first spring to block and shield the stationary contact, preventing air breakdown between the moving contact and the stationary contact. When the circuit is closed, the moving contact pushes the first protective cover away from the stationary contact, overcoming the force of the first spring, so that the moving contact and the stationary contact can make full contact. Only one first spring is needed for the first protective cover to block the stationary contact. It is not only simple in structure and has fewer parts, but also the stationary contact is fixed, and the contact between the fixed stationary contact and the moving contact is more reliable.

[0026] In addition, the arc extinguishing mechanism includes a first arc extinguishing chamber and a second arc extinguishing chamber, which can extinguish the electric arc more quickly.

[0027] In addition, the first protective cover is provided with a shielding groove, which can increase the creepage distance and improve the insulation effect. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the switching equipment when it is tripped;

[0029] Figure 2 It is a switchgear made of Figure 1 Towards Figure 2 Cross-sectional view of the motion process;

[0030] Figure 3 This is a cross-sectional view of the switchgear when it is closed;

[0031] Figure 4 This is a schematic diagram showing the coordination of the stationary contact, the second arc-extinguishing chamber, the first protective cover, and the third protective cover;

[0032] Figure 5 This is a schematic diagram of the stationary contact.

[0033] Figure 6 This is a schematic diagram of the third protective shield;

[0034] Figure 7 This is a schematic diagram of the contact support and moving contact structure;

[0035] Figure 8 This is the frontal view of the second protective shield in the first embodiment;

[0036] Figure 9 This is the rear view of the second protective cover in the first embodiment;

[0037] Figure 10 This is a second embodiment of the second protective cover;

[0038] Figure 11 This is a schematic diagram of the structure of the first protective cover;

[0039] Figure 12 This is a structural schematic diagram of the first protective shield from another perspective;

[0040] Figure 13 This is a schematic diagram of the arc-extinguishing shell;

[0041] Figure 14 This is a schematic diagram of the first spring;

[0042] Figure 15 This is a schematic diagram of the structure of the first arc-extinguishing chamber and the first arc-starting plate;

[0043] Figure 16 This is a schematic diagram of the structure of the second arc-starting plate;

[0044] In the picture:

[0045] 1. Switching unit 32 Second moving contact

[0046] 2. Operating mechanism 33. Contact partition

[0047] 3 moving contacts, 34 mounting holes

[0048] 4 stationary contacts, 40 stationary conductive plates

[0049] 5-contact support 41-first stationary contact

[0050] 6 First protective cover 42 Second static contact part

[0051] 7 First Spring 43 Arc-starting Through Hole

[0052] 8 Second protective cover 44 Third protective cover

[0053] 21 spindle, 51 support plate

[0054] 30 moving conductive plates 52 support bases

[0055] 31 First moving contact part 61 Side plate shielding

[0056] 62 shielding top plate 614 spring shaft

[0057] 63 shielding groove 621 first shielding surface

[0058] 64 First protruding rib 622 Second shielding surface

[0059] 65 Second rib 623 Third shielding surface

[0060] 71 Spring helical part 624 Fourth shielding surface

[0061] 72 Spring Connector 911 First Grid Plate

[0062] 73 Spring action part 921 Second grid plate

[0063] 81 Protective Surface 922 Arc-Extinguishing Shell

[0064] 82 guide protrusion 923 connecting hole

[0065] 91 First Arc Extinguishing Chamber; 931 First Leading Arc Section

[0066] 92 Second Arc Extinguishing Chamber; 932 First Rear Arc Drawing Section

[0067] 93 First arc-starting plate; 941 Second front arc-starting section

[0068] 94 Second arc-starting piece; 942 Second rear arc-starting part

[0069] 441 First protective through hole; 943 Second intermediate arc section

[0070] 442 Second protective through hole; 944 Arc-starting connection part

[0071] 443 Protective Insert Plate 945 Arc Striking Mounting Part

[0072] 444 Third protruding rib

[0073] 611 First Extension

[0074] 612 Second Extension

[0075] 613 Connecting Shaft Detailed Implementation

[0076] The specific embodiments of the switching device of this utility model are further described below with reference to the accompanying drawings. The switching device of this utility model is not limited to the description of the following embodiments.

[0077] like Figure 1-3As shown, in this embodiment, the switching device has mutually perpendicular height, width, and length directions. Figure 1 The vertical direction represents the height of the switchgear, and the horizontal direction represents its length. The perpendicular direction is... Figure 1 The orientation of the paper is the width direction of the switching device. For example... Figure 1 As shown, the switching device of this embodiment includes a housing and an operating mechanism, a protection mechanism, a drive mechanism, and at least one switching unit 1 respectively disposed in the housing. Multiple switching units 1 are arranged side by side along the width direction of the switching device. The operating mechanism 2 is disposed above the switching unit 1 in the height direction of the switching device. The switching unit 1 includes a contact mechanism, an arc extinguishing mechanism, and two wiring mechanisms (not shown in the figure). The contact mechanism includes a moving contact 3, a stationary contact 4, and a contact support 5. The moving contact 3 is disposed on the contact support 5. The moving contact 3 and the stationary contact 4 are respectively connected to the line through the corresponding wiring mechanism. The operating mechanism is connected to the contact support 5. The operating mechanism drives the moving contact 3 to contact and separate from the stationary contact 4 through the contact support 5, so as to respectively connect and disconnect the connected line.

[0078] The operating mechanism 2 in this embodiment includes a main shaft 21, a linkage mechanism, a drive shaft, a cam mechanism, and an energy storage mechanism. The main shaft 21 and the drive shaft are rotatably mounted on two operating mechanism side plates. The linkage mechanism, the cam mechanism, and the energy storage mechanism are mounted between the two operating mechanism side plates. The linkage mechanism is connected to the main shaft 21. The main shaft 21 is provided with a cantilever connected to the contact support 5, which is used to drive the moving contact 3 to contact and separate from the stationary contact 4. The drive mechanism drives the cam mechanism through the drive shaft to drive the energy storage mechanism to store energy, so that the operating mechanism 2 is in a stable energy storage state. The drive mechanism can be a manually operated handle or an electric motor. When the switchgear is in the open state and the operating mechanism 2 is in the energy storage state, the energy storage mechanism can be driven to release energy through the closing button. The released energy storage mechanism drives the linkage mechanism to drive the main shaft 21 to rotate in the closing direction, thereby driving the contact support 5 to drive the moving contact 3 to contact the stationary contact 4, thus realizing the closing. The linkage mechanism typically includes a rotatably connected transmission component and a trip latch, as well as a latch for locking the trip latch. When the latch locks the trip latch, the linkage mechanism can drive the drive spindle 21 to rotate the drive contact 3 support 5, causing the moving contact 3 to contact and separate from the stationary contact 4, and storing energy in the trip spring when the moving contact 3 contacts the stationary contact 4. When the latch unlocks the trip latch, it releases the trip spring. The released energy of the trip spring drives the spindle 21 to rotate the drive contact 3 support 5 through the linkage mechanism, causing the moving contact 3 to separate from the stationary contact 4. For example, the latch can be unlocked by triggering the trip latch with a trip button. The operating mechanism 2 is prior art in this field and will not be described in detail.

[0079] The protection mechanism is used to release the latch of the operating mechanism 2 from the trip latch when a line fault occurs, causing the operating mechanism 2 to disengage and release the trip spring. The trip spring drives the contact support 5 to separate the moving contact 3 from the stationary contact 4, thereby disconnecting the line and achieving the protection function. The arc extinguishing mechanism is used to extinguish the arc generated by the contact system. The protection mechanism typically includes an overload protection mechanism and a short-circuit protection mechanism. In this embodiment, the protection mechanism of the switchgear is an intelligent protection mechanism, which has both overload and short-circuit protection functions.

[0080] like Figure 1-4 As shown, an improvement in this embodiment is that it also includes a first protective cover 6 that is rotatably configured, and a first spring 7 connected to the first protective cover 6. The first spring 7 is used to drive the first protective cover 6 to block the stationary contact 4. When the contact support 5 drives the moving contact 3 to move closer to the stationary contact 4, it can push the first protective cover 6 away from the stationary contact 4 and lock the first spring 7 in an energy storage state. When the contact support 5 drives the moving contact 3 to separate from the stationary contact 4, it can move away from the first protective cover 6 and release the first spring 7. The first protective cover 6 is driven by the first spring 7 to block the stationary contact 4.

[0081] In this embodiment of the switching device, when the circuit is open, the first protective cover 6 is driven by the first spring 7 to block and shield the stationary contact 4, preventing air breakdown between the moving contact 3 and the stationary contact 4. When the circuit is closed, the moving contact 3 pushes the first protective cover 6 away from the stationary contact 4 by overcoming the force of the first spring 7, so that the moving contact 3 and the stationary contact 4 can make full contact. Only one first spring 7 is needed to enable the first protective cover 6 to block the stationary contact 4. This not only has a simple structure and fewer parts, but also the stationary contact 4 is fixed, and the contact between the fixed stationary contact 4 and the moving contact 3 is more reliable.

[0082] like Figure 7-9 As shown, the contact support 5 is provided with a second protective cover 8 for protecting the moving contact 3. As a first embodiment of the second protective cover 8, the second protective cover 8 is disposed on the contact support 5. The second protective cover 8 is located on the side of the moving contact 3 near the stationary contact 4. When the contact support 5 drives the moving contact 3 to move closer to the stationary contact 4, the second protective cover 8 pushes the first protective cover 6 away from the stationary contact 4. When the moving contact 3 contacts the stationary contact 4, the second protective cover 8 locks the first spring 7 in an energy storage state. When the contact support 5 drives the moving contact 3 to separate from the stationary contact 4, it drives the second protective cover 8 away from the first protective cover 6 and releases the first spring 7. The first spring 7 drives the first protective cover 6 to block the stationary contact 4.

[0083] In this embodiment, the contact support 5 is provided with multiple movable conductive plates 30, each of which has a movable contact 3. The second protective cover 8 includes a contact partition 33 for inserting between two adjacent movable conductive plates 30, and an arc-shaped protective surface 81 integrally formed and connected with the multiple contact partitions 33. Both the contact partitions 33 and the movable conductive plates 30 are provided with coaxially arranged mounting holes 34, through which a mounting shaft passes. The contact partitions 33 and the movable conductive plates 30 are rotatably mounted on the contact support via the mounting shaft. The protective surface 81 protrudes to the side away from the contact support 5. When the movable contact 3 moves closer to the stationary contact 4, the second protective cover 8 pushes the first protective cover 6 away from the stationary contact 4 through the middle of the protective surface 81. Of course, the protective surface 81 can also be separately provided from the contact partitions 33, and then connected to the contact partitions 33 by welding or riveting. It is understood that the contact support 5 may also push the first protective cover 6 through other integrally formed protruding structures or other structures connected to the contact support 5, without the second protective cover 8.

[0084] like Figure 10 As shown, in a second embodiment of the second protective cover 8, the second protective cover 8 is rotatably mounted on the contact support 5. The second protective cover 8 is provided with a guide protrusion 82, and a guide groove (not shown in the figure) that cooperates with the guide protrusion 82 is provided inside the housing. When the second protective cover 8 moves with the contact support 5, it drives the guide protrusion 82 to slide in the guide groove and pushes the guide protrusion 82 through the side wall of the guide groove, so that the second protective cover 8 rotates relative to the contact support 5. When the moving contact 3 contacts the stationary contact 4, the second protective cover 8 blocks the moving contact 3, and when the moving contact 3 separates from the stationary contact 4, the second protective cover 8 moves away from the moving contact 3.

[0085] In this embodiment, the second protective cover 8, when the contact support 5 rotates, drives the guide protrusion 82 to slide along the guide groove. The guide protrusion 82 drives the second protective cover 8 to rotate and quickly cover the silver point, preventing back-side breakdown. It does not require lengthening the opening distance to improve arc extinguishing performance, and has the characteristics of small size. Moreover, it does not require gravity or spring to drive the contact cover to rotate, which allows the second protective cover 8 to rotate more quickly. Before the contact support 5 moves to the fully open position, the second protective cover 8 can move into position to block the moving contact 3, and the first protective cover 6 blocks the stationary contact 4. Both the second protective cover 8 and the first protective cover 6 block between the moving contact 3 and the stationary contact 4.

[0086] It is understood that, as other embodiments of the second protective cover 8, the second protective cover 8 can be driven in other ways, such as when the moving contact 3 and the stationary contact 4 are separated, the second protective cover 8 rotates relative to the contact support 5 by gravity and blocks the moving contact 3; or, when the moving contact 3 and the stationary contact 4 are separated, the second protective cover 8 rotates relative to the contact support 5 by spring and blocks the moving contact 3. All of these fall within the protection scope of this utility model.

[0087] like Figure 11-12 As shown, the first protective cover 6 includes two rotatably mounted shielding side plates 61 and a shielding top plate 62 connected between the two shielding side plates 61. The shielding top plate 62 is arc-shaped, and the middle part of the shielding top plate 62 protrudes towards the side close to the contact support 5. The second protective cover 8 pushes the shielding top plate 62 to rotate around the rotation centerline of the shielding side plates 61, so that the stationary contact 4 is shielded and exposed through the shielding top plate 62.

[0088] Furthermore, the two sides of the shielding side plate 61 are respectively provided with a first extension 611 and a second extension 612. One end of the shielding top plate 62 is connected between the first extensions 611 of the two shielding side plates 61, and the end of the shielding top plate 62 away from the first extensions 611 is connected between the second extensions 612 of the two shielding side plates 61, so that the shielding top plate 62 is inclined.

[0089] Furthermore, the shielding top plate 62 is provided with a shielding groove 63 recessed towards the side away from the contact support 5. The shielding groove 63 increases the surface area of ​​the shielding top plate 62, thereby increasing the creepage distance between the stationary contact 4 and the moving contact 3 and improving the insulation effect. The shielding groove 63 is provided with a first protruding rib 64, which is parallel to the rotation axis of the shielding top plate 62. The shielding side plate 61 is provided with a second protruding rib 65, which is perpendicular to the first protruding rib 64. The first protruding rib 64 and the second protruding rib 65 can further increase the creepage distance and improve safety. In this embodiment, two first protruding ribs 64 and seven second protruding ribs 65 are provided, and the number of first protruding ribs 64 and second protruding ribs 65 can be adjusted. Of course, the shielding groove 63 can also be omitted, and the first protruding ribs 64 can be directly provided on the shielding top plate 62.

[0090] like Figure 1-3As shown, the shielding top plate 62 includes a first shielding surface 621, a second shielding surface 622, a third shielding surface 623, and a fourth shielding surface 624. One end of the second shielding surface 622 and one end of the third shielding surface 623 are connected to form a shielding groove 63. The end of the second shielding surface 622 away from the third shielding surface 623 is connected to the first shielding surface 621. The first shielding surface 621 is connected between the first extensions 611 of the two shielding side plates 61. The end of the third shielding surface 623 away from the second shielding surface 622 is connected to the fourth shielding surface 624. The fourth shielding surface 624 is connected between the second extensions 612 of the two shielding side plates 61. During the process of the contact support 5 driving the moving contact 3 to contact the stationary contact 4, the second protective cover 8 first follows... Figure 1 The position is shown to contact the end of the fourth shielding surface 624 away from the third shielding surface 623, and pushes the fourth shielding surface 624 to rotate the first protective cover 6 to Figure 2 The position is indicated, then the second protective cover 8 separates from the fourth shielding surface 624 and contacts the end of the first shielding surface 621 near the second shielding surface 622, pushing the first shielding surface 621 to rotate the first protective cover 6 to... Figure 3 The position shown prevents the second protective cover 8 from contacting the second shielding surface 622 and the third shielding surface 623.

[0091] like Figure 1-3 As shown, the arc extinguishing mechanism includes a first arc extinguishing chamber 91 and a second arc extinguishing chamber 92. The first arc extinguishing chamber 91 is disposed on the side of the moving contact 3 and the stationary contact 4 along the length direction of the switchgear. The second arc extinguishing chamber 92 is disposed on the side of the stationary contact 4 away from the moving contact 3 along the height direction of the switchgear. The first arc extinguishing chamber 91 is provided with a plurality of first grid plates 911 arranged along the height direction of the switchgear. The first grid plates 911 extend along the length direction of the switchgear and are parallel to or slightly inclined to the length direction of the switchgear. The second arc extinguishing chamber 92 is provided with a plurality of second grid plates 921 arranged along the length direction of the switchgear. The second grid plates 921 extend along the height direction of the switchgear and are parallel to or slightly inclined to the height direction of the switchgear. The first arc extinguishing chamber 91 and the second arc extinguishing chamber 92 cut the arc through the first grid plates 911 and the second grid plates 921 respectively, which can extinguish the arc more quickly.

[0092] like Figure 4 , 13As shown in Figure -14, the second arc-extinguishing chamber 92 includes an arc-extinguishing housing 922, a second grid plate 921 disposed in the arc-extinguishing housing 922, a stationary contact 4 disposed above the arc-extinguishing housing 922, and two shielding side plates 61 of the first protective cover 6 disposed opposite to each other on both sides of the arc-extinguishing housing 922. The two shielding side plates 61 are rotatably connected to the arc-extinguishing housing 922 respectively. The side of the arc-extinguishing housing 922 away from the stationary contact 4 is provided with two connecting holes 923. The two shielding side plates 61 are disposed opposite to each other on both sides of the arc-extinguishing housing 922. The two shielding side plates 61 are provided with two connecting shafts 613 corresponding to the two connecting holes 923 respectively. The two connecting shafts 613 are respectively inserted into the corresponding connecting holes 923 and rotatably connected.

[0093] The two shielding side plates 61 are each provided with a spring shaft 614 connected to the first spring 7. The first spring 7 includes two spring helical portions 71 corresponding to the two shielding side plates 61, and a spring connecting portion 72 connecting the two spring helical portions 71. The ends of the two spring helical portions 71 away from the spring connecting portion 72 are each provided with a spring actuating portion 73. The two spring helical portions 71 are respectively sleeved on the connecting shaft 613 of the corresponding shielding side plate 61. The spring connecting portion 72 abuts against the arc-extinguishing housing 922, and the two spring actuating portions 73 abut against the spring shaft 614 of the corresponding shielding side plate 61. The edge of the connecting hole 923 is provided with a raised protective boss for protecting the spring helical portions 71. It is understood that the first protective cover 6 can also be directly rotatably mounted on the housing, or a corresponding boss structure can be provided on the housing and the first protective cover 6 can be rotatably mounted on the boss structure; both fall within the protection scope of this utility model.

[0094] like Figure 1-3As shown in Figures 15-16, the arc-extinguishing mechanism further includes a first arc-initiating plate 93 and a second arc-initiating plate 94. The first arc-initiating plate 93 is connected between the first arc-extinguishing chamber 91 and the second arc-extinguishing chamber 92. The two ends of the first arc-initiating plate 93 are respectively provided with a first front arc-initiating portion 931 and a first rear arc-initiating portion 932, which are located in the first arc-extinguishing chamber 91 and the second arc-extinguishing chamber 92, respectively. The first front arc-initiating portion 931 and the first rear arc-initiating portion 932 are bent and connected. The first front arc-initiating portion 931 is basically parallel to the first grid plate 911, and the first rear arc-initiating portion 932 is basically parallel to the second grid plate 921. The second arc-initiating plate 94 is connected to the stationary contact 4 and is bent... The second arc-starting plate 94 extends into the second arc-extinguishing chamber 92. It includes a second front arc-starting portion 941 and a second rear arc-starting portion 942, and a second middle arc-starting portion 943 connecting the second front arc-starting portion 941 and the second rear arc-starting portion 942. The first rear arc-starting portion 932 and the second rear arc-starting portion 942 are disposed opposite to each other at both ends of the second arc-extinguishing chamber 92. The first front arc-starting portion 931 and the second front arc-starting portion 941 are disposed in the first arc-extinguishing chamber 91 at one end near the second arc-extinguishing chamber 92. The second front arc-starting portion 941 cooperates with the stationary contact 4. The second front arc-starting portion 941 and the first front arc-starting portion 931 are spaced apart and form a second arc-starting channel communicating with the second arc-extinguishing chamber 92.

[0095] like Figure 3-5 As shown, the stationary contact 4 includes a stationary conductive plate 40, and a first stationary contact portion 41 and a second stationary contact portion 42 respectively disposed on the side of the stationary conductive plate 40. The stationary contact 4 is fixedly mounted on the arc-extinguishing housing 922. The stationary conductive plate 40 has an arc-starting through hole 43 in the middle. The arc-extinguishing housing 922 has an arc-extinguishing housing through hole corresponding to the arc-starting through hole 43. The second stationary contact portion 42 is located between the first stationary contact portion 41 and the arc-starting through hole 43. The first arc-starting piece 93 and the second arc-starting piece 94 pass through the arc-starting through hole 43 and the arc-extinguishing housing through hole. The second front arc-starting portion 941 of the second arc-starting piece 94 cooperates with the second stationary contact portion 42. The second front arc-starting portion 941 is Y-shaped and includes two arc-starting mounting portions 945 spaced apart, and arc-starting connecting portions 944 respectively connected to the two arc-starting mounting portions 945. The two arc-starting mounting portions 945 are respectively connected to the stationary conductive plate 40 by screws. The second stationary contact portion 42 is located between the two arc-starting mounting portions 945.

[0096] like Figure 7As shown, the moving contact 3 includes a first moving contact 31 corresponding to the first stationary contact 41, and a second moving contact 32 corresponding to the second stationary contact 42. The distance from the second moving contact 32 to the rotation center of the contact support 5 is greater than the distance from the rotation center of the first moving contact 31 to the contact support 5. When the switchgear is closed, the second moving contact 32 can contact the second stationary contact 42 before the first moving contact 31 contacts the first stationary contact 41. After the first moving contact 31 contacts the first stationary contact 41, the second moving contact 32 is supported and lifted by the first moving contact 31 and the first stationary contact 41, and can separate from the second stationary contact 42. When the switchgear is opened, the second moving contact 32 contacts the first moving contact 31 when the first moving contact 31 is about to separate from the first stationary contact 41. After the first moving contact 31 separates from the first stationary contact 41, the second moving contact 32 separates from the second stationary contact 42 and pulls the arc toward the first arc-extinguishing chamber 91. The first moving contact 31 and the first stationary contact 41 are mainly responsible for carrying current. The second moving contact 32 and the second stationary contact 42 play the role of arc initiation and protect the first moving contact 31 and the first stationary contact 41, reducing the burning of the first moving contact 31 and the first stationary contact 41 by the electric arc.

[0097] In this embodiment, the second protective cover 8 is used to protect the first stationary contact 41 and the first moving contact 31. This allows the second protective cover 8 to rotate at a smaller angle and at a faster speed. When the first stationary contact 41 and the first moving contact 31 separate, the second protective cover 8 rotates at least to block the first moving contact 31, and the first protective cover 6 at least blocks the first stationary contact 41. When the first stationary contact 41 contacts the first moving contact 31, the first protective cover 6 and the second protective cover 8 separate from the first stationary contact 41 and the first moving contact 31. Alternatively, the first protective cover 6 and the second protective cover 8 can be made larger to isolate more of the moving contact 3 and the stationary contact 4, including isolating the second moving contact 32 and the second stationary contact 42. However, this would slow down the rotation and increase the space required.

[0098] like Figure 4-6As shown, the static conductive plate 40 is provided with a flat plate-shaped third protective cover 44. The third protective cover 44, the first static contact portion 41, and the second static contact portion 42 are arranged on the same plane. The third protective cover 44 is located on one side of the first static contact portion 41. The third protective cover 44 has a connected first protective through hole 441 and a second protective through hole 442 in the middle. The first protective through hole 441 corresponds to the second static contact portion 42 and is used to fit outside the second static contact portion 42 and the first front arc-leading portion 931 of the first arc-leading piece 93. The second protective through hole 442 corresponds to the arc-leading through hole 43 on the static conductive plate 40 and is used to pass through the first arc-leading piece 93 and the second arc-leading piece 94. The third protective cover 44 can protect the side of the static conductive plate 40.

[0099] Furthermore, the third protective cover 44 is provided with a protective insert plate 443 in the second protective through hole 442. The protective insert plate 443 is used to insert into the arc-starting through hole 43 of the static conductive plate 40 to protect the arc-starting through hole 43. The side of the third protective cover 44 is provided with a raised third rib 444, which can improve the creepage distance.

[0100] like Figure 7 As shown, the contact support 5 includes two support plates 51 rotatably connected to the housing, and a support seat 52 disposed between the two support plates 51. The moving contact 3 is rotatably disposed on the support plate 51. A contact spring is provided between the moving contact 3 and the support seat 52. The contact spring pre-tightens the moving contact 3 on the contact support 5 to provide overtravel and increase the contact force between the moving contact 3 and the stationary contact 4. The contact support 5 is provided with multiple moving conductive plates 30. Each moving conductive plate 30 is provided with a first moving contact portion 31. The three moving conductive plates 30 located in the middle are provided with second moving contact portions 32 extending into the first arc-extinguishing chamber 91. When the first moving contact portion 31 contacts and separates from the first stationary contact portion 41, it can simultaneously drive the three second moving contact portions 32 to contact and separate from the second stationary contact portion 42. Of course, the number of second moving contact portions 32 can also be one, two, or more, and the number of first moving contact portions 31 can also be adjusted, all of which fall within the protection scope of this utility model. It should also be noted that, as in other conventional embodiments, the moving contact 3 may not have a second moving contact portion 32, but only a first moving contact portion 31, and the corresponding stationary contact 4 may not have a second stationary contact portion 42.

[0101] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0102] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A switch device comprising a housing and an operating mechanism (2) and at least one switch unit (1) arranged in the housing respectively, the switch unit (1) comprising a contact mechanism and an arc extinguishing mechanism, the contact mechanism comprising a moving contact (3), a stationary contact (4) and a contact support (5), the moving contact (3) being arranged on the contact support (5), the operating mechanism (2) being capable of driving the contact support (5) to rotate, the moving contact (3) being driven by the contact support (5) to contact and separate from the stationary contact (4), characterized in that: a first protective cover (6) is arranged rotatably, and a first spring (7) is connected with the first protective cover (6), the first spring (7) being used to drive the first protective cover (6) to shield the stationary contact (4), when the moving contact (3) is driven by the contact support (5) to move close to the stationary contact (4), the first protective cover (6) is pushed away from the stationary contact (4) and the first spring (7) is locked in an energy storage state, when the moving contact (3) is driven by the contact support (5) to separate from the stationary contact (4), the first spring (7) drives the first protective cover (6) to shield the stationary contact (4). A second protective cover (8) is arranged on the contact support (5), the second protective cover (8) being located on the side of the moving contact (3) close to the stationary contact (4), when the moving contact (3) is driven by the contact support (5) to move close to the stationary contact (4), the first protective cover (6) is pushed away from the stationary contact (4) by the second protective cover (8) and the first spring (7) is locked in an energy storage state, when the moving contact (3) is driven by the contact support (5) to separate from the stationary contact (4), the second protective cover (8) is driven away from the first protective cover (6).

2. The switching device of claim 1, wherein: The second protective cover (8) is fixedly arranged on the contact support (5), the second protective cover (8) being provided with an arc-shaped protective surface (81), the middle part of the protective surface (81) being protruded to the side away from the contact support (5), when the moving contact (3) is driven to move close to the stationary contact (4), the first protective cover (6) is pushed by the second protective cover (8) through the protective surface (81).

3. The switching device of claim 2, wherein: The second protective cover (8) is rotatably arranged on the contact support (5), the second protective cover (8) being provided with a guide protrusion (82), a guide groove matched with the guide protrusion (82) being arranged in the housing, when the second protective cover (8) moves with the contact support (5), the guide protrusion (82) is slid in the guide groove and pushed by the guide groove, so that the second protective cover (8) rotates relative to the contact support (5), when the moving contact (3) contacts the stationary contact (4), the second protective cover (8) is driven away from the moving contact (3), and when the moving contact (3) separates from the stationary contact (4), the second protective cover (8) shields the moving contact (3).

4. The switching device of claim 2, wherein: The first protective cover (6) comprises two shielding side plates (61) arranged rotatably and a shielding top plate (62) connected between the two shielding side plates (61), the shielding top plate (62) rotating around the rotational center line of the shielding side plates (61), the shielding top plate (62) shielding and exposing the stationary contact (4).

5. The switching device of claim 2, wherein: ​ 6. The switching device of claim 1, wherein: The arc extinguishing mechanism comprises a first arc extinguishing chamber (91) and a second arc extinguishing chamber (92), the first arc extinguishing chamber (91) is arranged on the side of the moving contact (3) and the static contact (4) along the length direction of the switch device, the second arc extinguishing chamber (92) is arranged on the side of the static contact (4) away from the moving contact (3) along the height direction of the switch device, the first arc extinguishing chamber (91) is provided with a plurality of first fins (911) arranged along the height direction of the switch device, and the second arc extinguishing chamber (92) is provided with a plurality of second fins (921) arranged along the length direction of the switch device.

7. The switching device of claim 6, wherein: The second arc extinguishing chamber (92) comprises an arc extinguishing shell (922), the second fins (921) are arranged in the arc extinguishing shell (922), the first protective cover (6) is provided with two shielding side plates (61) arranged on the two sides of the arc extinguishing shell (922) and a shielding top plate (62) connected between the two shielding side plates (61), and the two shielding side plates (61) are rotationally connected with the arc extinguishing shell (922) respectively.

8. The switching device of claim 7, wherein: The two shielding side plates (61) are respectively provided with spring shafts (614) connected with the first springs (7), the first spring (7) comprises two spring spiral parts (71) corresponding to the two shielding side plates (61) respectively and a spring connecting part (72) connected between the two spring spiral parts (71), one end of each of the two spring spiral parts (71) away from the spring connecting part (72) is provided with a spring acting part (73), the arc extinguishing shell (922) is provided with a connecting hole (923), the two shielding side plates (61) are provided with connecting shafts (613), the connecting shafts (613) are inserted into the corresponding connecting holes (923) to be rotationally connected, the two spring spiral parts (71) are respectively sleeved on the connecting shafts (613) of the corresponding shielding side plates (61), the spring connecting part (72) abuts against the arc extinguishing shell (922), and the two spring acting parts (73) respectively abut against the spring shafts (614) of the corresponding shielding side plates (61).

9. The switching device of claim 6, wherein: The arc extinguishing mechanism further comprises a first arc striking sheet (93) and a second arc striking sheet (94), the first arc striking sheet (93) is connected between the first arc extinguishing chamber (91) and the second arc extinguishing chamber (92), two ends of the first arc striking sheet (93) are respectively provided with a first front arc striking part (931) and a first rear arc striking part (932), the first front arc striking part (931) and the first rear arc striking part (932) are respectively located in the first arc extinguishing chamber (91) and the second arc extinguishing chamber (92), the second arc striking sheet (94) is connected with the static contact (4) and is bent to extend into the second arc extinguishing chamber (92), two ends of the second arc striking sheet (94) are respectively provided with a second front arc striking part (941) and a second rear arc striking part (942), the first rear arc striking part (932) and the second rear arc striking part (942) are oppositely arranged at two ends of the second arc extinguishing chamber (92), the first front arc striking part (931) and the second front arc striking part (941) are arranged at one end of the first arc extinguishing chamber (91) close to the second arc extinguishing chamber (92), the second front arc striking part (941) cooperates with the static contact (4), and the second front arc striking part (941) is arranged in a spaced mode from the first front arc striking part (931) and forms a second arc striking channel communicating with the second arc extinguishing chamber (92).

10. The switching device of claim 9, wherein: The static contact (4) comprises a static conductive plate (40) and first and second static contact parts (41) and (42) arranged on side surfaces of the static conductive plate (40), the static contact (4) is fixedly installed on the arc extinguishing shell (922), a middle part of the static conductive plate (40) is provided with an arc striking through hole (43), the arc extinguishing shell (922) is provided with an arc extinguishing shell through hole corresponding to the arc striking through hole (43), the second static contact part (42) is located between the first static contact part (41) and the arc striking through hole (43), the first arc striking sheet (93) and the second arc striking sheet (94) pass through the arc striking through hole (43) and the arc extinguishing shell through hole, the second front arc striking part (941) of the second arc striking sheet (94) cooperates with the second static contact part (42), and when the moving contact (3) is separated from the static contact (4), the first protective cover (6) at least shields the first static contact part (41).

11. The switching device of claim 10, wherein: The second front arc striking part (941) cooperates with the second static contact part (42), the second front arc striking part (941) comprises two arc striking mounting parts (945) arranged in a spaced mode and an arc striking connecting part (944) connected with the two arc striking mounting parts (945) respectively, the two arc striking mounting parts (945) are connected with the static conductive plate (40) through screws respectively, and the second static contact part (42) is located between the two arc striking mounting parts (945).

12. The switching device of claim 10, wherein: The third protective cover (44) is provided on the static conducting plate (40), the third protective cover (44), the first static contact part (41) and the second static contact part (42) are arranged on the same plane, the third protective cover (44) is located on one side of the first static contact part (41), a first protection through hole (441) and a second protection through hole (442) are arranged in the middle of the third protective cover (44) and are connected, the first protection through hole (441) corresponds to the second static contact part (42), the first protection through hole (441) is used for being sleeved outside the second static contact part (42) and the first front arc guide part (931) of the first arc guide sheet (93), the second protection through hole (442) corresponds to the arc guide through hole (43) on the static conducting plate (40) and is used for penetrating through the first arc guide sheet (93) and the second arc guide sheet (94).

13. The switching device of claim 12, wherein: The second protection through hole (442) of the third protective cover (44) is provided with a protection plug-in plate (443), the protection plug-in plate (443) is used for being inserted into the arc guide through hole (43) of the static conducting plate (40), and the side surface of the third protective cover (44) is provided with a third convex rib (444).

14. The switching device of claim 10, wherein: The moving contact (3) comprises a first moving contact part (31) corresponding to the first static contact part (41) and a second moving contact part (32) corresponding to the second static contact part (42), the distance from the second moving contact part (32) to the rotation center of the contact support (5) is greater than the distance from the first moving contact part (31) to the rotation center of the contact support (5), when the switch device is closed, the second moving contact part (32) can be in contact with the second static contact part (42) before the first moving contact part (31) is in contact with the first static contact part (41), and the second moving contact part (32) can be separated from the second static contact part (42) after the first moving contact part (31) is in contact with the first static contact part (41); When the switch device is opened, the second moving contact part (32) is separated from the second static contact part (42) after the first moving contact part (31) is separated from the first static contact part (41), and the arc is pulled to the first arc extinguishing chamber (91) of the arc extinguishing mechanism.

15. The switching device of claim 3, wherein: A plurality of dynamic conducting plates (30) are arranged on the contact support (5), the dynamic conducting plates (30) are respectively provided with moving contacts (3), a contact partition plate (33) is arranged between adjacent two dynamic conducting plates (30), the contact partition plate (33) is connected with the contact support (5), and the protection surface (81) of the second protective cover (8) is fixedly connected with the plurality of contact partition plates (33).

16. The switching device of claim 5, wherein: The shielding top plate (62) and the shielding side plate (61) are arranged in an inclined mode, the shielding top plate (62) is in an arc surface shape, the middle part of the shielding top plate (62) is protruded towards one side close to the contact support (5), the second protective cover (8) drives the shielding top plate (62) to rotate around the rotation center line of the shielding side plate (61), and the shielding top plate (62) is used for shielding and exposing the static contact (4).

17. The switching device of claim 16, wherein: The shielding top plate (62) is provided with a shielding groove (63) recessed away from the contact support (5) side, the shielding groove (63) is provided with a first convex rib (64), the first convex rib (64) is arranged parallel to the rotation axis of the shielding side plate (61), and the shielding side plate (61) is provided with a second convex rib (65).

18. The switching device of claim 17, wherein: The two opposite sides of the shielding side plate (61) are respectively provided with a first extension part (611) and a second extension part (612), one end of the shielding top plate (62) is connected between the first extension parts (611) of the two shielding side plates (61), and the end of the shielding top plate (62) away from the first extension part (611) is connected between the second extension parts (612) of the two shielding side plates (61), so that the shielding top plate (62) is arranged inclined to the shielding side plate (61); the shielding top plate (62) comprises a first shielding surface (621), a second shielding surface (622), a third shielding surface (623) and a fourth shielding surface (624), one end of the second shielding surface (622) and one end of the third shielding surface (623) are connected and form a shielding groove (63), the end of the second shielding surface (622) away from the third shielding surface (623) is connected with the first shielding surface (621), the first shielding surface (621) is connected between the first extension parts (611) of the two shielding side plates (61), the end of the third shielding surface (623) away from the second shielding surface (622) is connected with the fourth shielding surface (624), and the fourth shielding surface (624) is connected between the second extension parts (612) of the two shielding side plates (61); in the process that the contact support (5) drives the moving contact (3) to contact the static contact (4), the second protection cover (8) first pushes the fourth shielding surface (624) to make the first protection cover (6) rotate, then the second protection cover (8) is separated from the fourth shielding surface (624) and pushes the first shielding surface (621) to make the first protection cover (6) rotate.

Images