Switch unit

Abstract

The utility model relates to the field of low-voltage electric appliances, in particular to a switch unit, which is characterized in that two groups of flash barriers are oppositely arranged at intervals along a first direction, two groups of arc passages respectively arranged on two radial sides of a support are formed between the flash barriers, and two groups of arc extinguishing devices are respectively arranged on two sides of the two groups of arc passages along the radial direction of the support; one end of each arc passage is relatively communicated with the corresponding contact groove, and the other end of each arc passage is relatively communicated with the arc inlet of the corresponding arc extinguishing device; the switch unit further comprises communicating air passages which are arranged side by side with the arc passage at intervals in the first direction, and when the moving contact mechanism is in the off position, each contact groove is communicated with the arc inlet of the corresponding arc extinguishing device through at least one group of communicating air passages; the switch unit is good in arc extinguishing performance.

Description

Technical Field

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

[0002] A rotary disconnector typically consists of an operating handle, an operating mechanism, and a switch body. The switch body comprises multiple stacked switch units, each of which includes a unit housing, a contact system, and an arc-extinguishing device. The contact system comprises a rotatable movable contact mechanism and a pair of stationary contacts. The operating mechanism is transmission-connected to the movable contact mechanism. External force applied to the operating handle drives each movable contact mechanism to close and open with its corresponding stationary contact. The arc-extinguishing device extinguishes arcs generated by the contact system. In existing rotary disconnectors, the arc generated by the disconnection of the movable and stationary contacts cannot be promptly diverted, resulting in burn damage to the movable and stationary contacts, shortening their service life. Utility Model Content

[0003] The purpose of the present utility model is to overcome at least one defect of the prior art and provide a switch unit with good arc extinguishing performance.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A switch unit, comprising a unit housing and a moving contact mechanism, a static contact, an arc extinguishing device, and an arc isolation plate respectively arranged in the unit housing; the moving contact mechanism comprises a rotatable support and a moving contact arranged on the support, the rotation axis of the support is a first direction, the moving contact comprises a moving contact portion, two groups of moving contact portions respectively cooperate with the static contact portions of the two groups of static contacts to form two groups of contact pairs, the support comprises a contact slot, the two groups of contact slots respectively cooperate with the two groups of contact pairs and are located in the axial middle and radial ends of the support, at least part of each moving contact portion is located in the corresponding contact slot, and each static contact portion is inserted into the corresponding contact slot for closing and disconnecting with the corresponding moving contact portion; the two groups of arc isolation plates are relatively spaced along the first direction and form two groups of arc passages respectively arranged on the radial sides of the support, the two groups of arc extinguishing devices are respectively arranged on the radial sides of the two groups of arc passages along the radial direction of the support, one end of each arc passage is relatively connected to the corresponding contact slot and the other end is relatively connected to the arc inlet of the corresponding arc extinguishing device;

[0006] The switch unit further includes a communication air channel arranged side by side with the arc passage along the first direction. When the moving contact mechanism is in the disconnected position, each contact slot is connected to the arc inlet of the corresponding arc extinguishing device through at least one group of communication air channels.

[0007] Furthermore, the communication air channel includes an inner port communicating with the corresponding contact slot and an outer port communicating with the arc inlet of the corresponding arc extinguishing device, and the diameter of the outer port is greater than or equal to the inner port.

[0008] Further, when the moving contact mechanism is in the open position, in the rotation direction of the moving contact mechanism, the two ends of each contact groove respectively accommodate the moving contact part and the static contact part of the corresponding contact pair, and one end of the communication air passage connected to the contact groove is located between the moving contact part and the static contact part in the contact groove.

[0009] Further, each of the contact grooves is connected to the arc inlet of the corresponding arc extinguishing device through a set of communication air passages, and one end of the communication air passage connected to the arc inlet of the arc extinguishing device is arranged close to the corresponding static contact part.

[0010] Further, the communication air passage and the corresponding arc passage are respectively located on both sides of the corresponding arc partition plate.

[0011] Further, the two groups of arc partition plates are respectively an upper arc partition plate and a lower arc partition plate, and both include two arc partition parts respectively arranged on the radial two sides of the support, namely a first arc partition part and a second arc partition part. The two first arc partition parts face each other in the first direction and form an arc passage therebetween, and the two second arc partition parts face each other in the first direction and form another arc passage therebetween; the two bottom walls of the unit housing arranged at intervals relative to each other in the first direction are respectively an upper bottom wall and a lower bottom wall, and the moving contact mechanism, the two groups of static contacts, the two groups of arc partition plates and the two groups of arc extinguishing devices are all located between the upper bottom wall and the lower bottom wall; the two arc partition parts of the upper arc partition plate are stacked with the upper bottom wall in the first direction, and the two arc partition parts of the lower arc partition plate are stacked with the lower bottom wall in the first direction.

[0012] Further, the communication air passage is arranged on the arc partition part, and each communication air passage includes an outer port, a channel groove and an inner port which are arranged on the corresponding arc partition part and are connected in sequence. The outer port is relatively communicated with the arc inlet of the corresponding arc extinguishing device, the inner port is relatively communicated with the corresponding contact groove, and the channel groove is arranged on the side of the corresponding arc partition part facing the bottom wall of the corresponding unit housing.

[0013] Further, a support inlet relatively communicated with the corresponding communication air passage is arranged on the side wall of the contact groove, and the two groups of support inlets are respectively arranged at the two radial ends of the support and are respectively communicated with the two groups of arc extinguishing devices through the communication air passages.

[0014] Further, the upper arc partition plate and the lower arc partition plate are both provided with arc partition plate installation grooves, and each arc partition plate installation groove is formed between the corresponding two arc partition parts; the support includes a cover plate and a seat plate arranged at intervals relative to each other in the first direction, the moving contact is clamped between the cover plate and the seat plate, two contact grooves are formed between the cover plate and the seat plate, and the cover plate and the seat plate are respectively rotatably arranged in the two arc partition plate installation grooves; the communication air passage is arranged on the arc partition part corresponding to the arc partition plate installation groove, and one end is used for being relatively communicated with the corresponding support inlet.

[0015] Further, the upper arc partition plate is of an integral structure; and / or, the lower arc partition plate is of an integral structure.

[0016] Further, when the moving contact mechanism is in the open position, each contact groove is communicated with the arc inlet of the corresponding arc extinguishing device through a set of communication air channels, and the two sets of communication air channels are centrosymmetric structures with the rotation axis of the moving contact mechanism as the central symmetry axis.

[0017] Further, in the first direction, the height of each contact groove ≤ the height of the corresponding arc passage, and the height of each arc passage is less than the width of the arc extinguishing grids of the corresponding arc extinguishing device.

[0018] For the switch unit of the present utility model, when the moving contact mechanism is disconnected from the static contact, the arc generated forms a hot air flow in the arc extinguishing device. Part of the hot air flow is discharged from the switch unit u, and part of the hot air flow enters the corresponding contact groove through the communication air channel, which is beneficial to boosting the arc in the contact groove and the arc passage to move towards the arc extinguishing device and enter the arc extinguishing device, thereby improving the arc transfer rate and avoiding or significantly reducing the burning of the moving / static contacts by the arc.

[0019] In addition, the communication air channel is a trumpet-shaped air channel, which is beneficial to the hot air flow entering the communication air channel. When the hot air flow flows through the communication air channel and sprays out from the small end, the air flow velocity is greater, which is more beneficial to pushing the arc in the contact groove and the arc passage towards the corresponding arc extinguishing device, thereby improving the arc extinguishing efficiency. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the disconnector of the present utility model;

[0021] Figure 2 is a three-dimensional structural diagram of the switch unit of the present utility model;

[0022] Figure 3 is an exploded view of the moving contact mechanism of the present utility model;

[0023] Figure 4 is a schematic structural diagram of the arc partition plate of the present utility model from one perspective;

[0024] Figure 5 is a schematic structural diagram of the arc partition plate of the present utility model from another perspective;

[0025] Figure 6 is a projection view of the switch unit of the present utility model;

[0026] Figure 7 is a sectional view of the switch unit of the present utility model, showing the flow path of the hot air flow.

[0027] Description of the Reference Numerals

[0028] operating handle 1;

[0029] Operating mechanism 2;

[0030] Switch body b;

[0031] Switch unit u; unit shell 1u; contact system c, moving contact mechanism 2u, support 2-1u, supporting upper cover 2-11u, cover plate 2-110u, support base 2-12u, base plate 2-120u, supporting inlet 2-121u, contact slot 2-122u, moving contact 2-2u, first static contact 3-1u, second static contact 3-2u; first arc extinguishing device 4-1u, second arc extinguishing device 4-2u; arc extinguishing grid 4-30u, lower arc extinguishing plate 5-2u, arc extinguishing plate mounting groove 51u, first arc extinguishing part 52u, second arc extinguishing part 53u, arc extinguishing part axial hole 54u, connecting air duct 55u, inner port 55-1u, channel groove 55-2u, outer port 55-3u. DETAILED DESCRIPTION

[0032] The specific implementation of the isolating switch of the present invention will be further described below with reference to the embodiments given in the accompanying drawings. The isolating switch of the present invention is not limited to the description of the following embodiments.

[0033] like Figure 1 As shown, the isolating switch of the present invention is preferably a rotary isolating switch, which includes an operating mechanism 2 and a switch body b stacked together along a first direction, the switch body b includes at least one switch unit u, the switch unit u includes a unit shell 1u and a contact system c and an arc extinguishing device respectively arranged in the unit shell 1u, the contact system c includes a moving contact mechanism 2u and two groups of static contacts used in conjunction with each other, the moving contact mechanism 2u includes a support 2-1u rotatably arranged on the unit shell 1u and a moving contact 2-2u arranged on the support 2-1u, the moving contact mechanism 2u is rotatably arranged through the support 2-1u and its rotation axis is the same as the first direction, the moving contact 2-2u includes two groups of moving contact parts, the two groups of moving contact parts respectively cooperate with the static contact parts of the two groups of static contacts to form two groups of contact pairs, the operating mechanism 2 is transmission-connected to the support 2-1u, driving each moving contact mechanism 2u to rotate so that it closes and disconnects with the corresponding two groups of static contacts (that is, the corresponding two groups of contact pairs are closed and disconnected), that is, driving each switch unit u to close and disconnect. The operating mechanism 2 can be realized by existing technology and will not be described in detail here. The isolating switch of the present invention also includes an operating handle 1, which is connected to the main shaft of the operating mechanism 2. External force turning the operating handle 1 can drive each switch unit u to close or open through the operating mechanism 2.

[0034] like Figure 2 、 6 The figure shows an embodiment of the switch unit u.

[0035] The switch unit u further includes two arc extinguishing devices and two arc separating plates disposed in the unit housing 1u. The two arc extinguishing devices are respectively disposed on the radial two sides of the moving contact mechanism 2u and respectively cooperate with the two contact pairs, and are respectively used for extinguishing the arcs generated when the two contact pairs are closed and disconnected. The two arc separating plates are relatively spaced along the first direction, and two arc channels are formed therebetween. The two arc channels are respectively located on the radial two sides of the moving contact mechanism 2u and are located between the two arc extinguishing devices along the radial direction of the moving contact mechanism 2u. One end of each arc channel is relatively communicated with the arc inlet of the corresponding arc extinguishing device, and the other end cooperates with the corresponding contact pair. In the moving contact mechanism 2u, the support 2-1u includes contact grooves 2-122u. The two contact grooves 2-122u respectively cooperate with the two contact pairs, are located in the middle of the axis and at the two radial ends of the support 2-1u, that is, the contact grooves 2-122u cooperate with the contact pairs one by one. The two contact grooves 2-122u are both located in the middle of the support 2-1u in the axial direction (i.e., the first direction) of the support 2-1u, and the two contact grooves 2-122u are respectively located at the two ends of the support 2-1u in the radial direction of the support 2-1u (the radial direction of the support 2-1u is perpendicular to the first direction). At least a part of each moving contact part is located in the corresponding contact groove 2-122u, and each static contact part is inserted into the corresponding contact groove 2-122u and is closed and disconnected from the corresponding moving contact part. That is, during the rotation of the moving contact mechanism 2u, the static contact part is always inserted into the corresponding contact groove 2-122u, and the moving contact part is closed and disconnected from the corresponding static contact part as the moving contact mechanism 2u rotates. The contact groove 2-122u is preferably a slit structure, and this slit structure is beneficial to the rapid transfer of the arc generated by the contact pair, thereby reducing the damage to the moving contact and the static contact. The two arc channels are respectively disposed on the two sides of the two contact grooves 2-122u along the radial direction of the moving contact mechanism 2u. The contact groove 2-122u, the arc channel, and the arc extinguishing device cooperate one by one. One end of each arc channel is relatively communicated with the corresponding contact groove 2-122u, and the other end is relatively communicated with the arc inlet of the corresponding arc extinguishing device; in the first direction, the height of each contact groove 2-122u ≤ the height of the corresponding arc channel, and the height of each arc channel is less than the width of the arc extinguishing grid 4-30u of the corresponding arc extinguishing device, that is, the height of each arc channel is less than the height of the gap between the adjacent arc extinguishing grids 4-30u of the corresponding arc extinguishing device, which is beneficial to the transfer of the arc from the moving contact mechanism 2u to the arc extinguishing device, prompting the arc to enter the arc extinguishing device faster and improving the arc extinguishing efficiency.

[0036] Specifically, such as Figure 2 、 6As shown, the two sets of arc separating plates are respectively a first arc separating plate (not shown in the figure) and a second arc separating plate 5-2u arranged side by side and spaced apart in the first direction. Each arc separating plate includes two arc separating parts respectively arranged on the radial two sides of the support 2-1u, namely a first arc separating part 52u and a second arc separating part 53u. The two first arc separating parts 52u are arranged relatively and spaced apart in the first direction to form an arc passage, and the two second arc separating parts 53u are arranged relatively and spaced apart in the first direction to form another arc passage; the unit housing 1u includes two bottom walls arranged relatively and spaced apart in the first direction, namely an upper bottom wall (not shown in the figure) and a lower bottom wall; the two arc separating parts of the upper arc separating plate are stacked with the upper bottom wall in the first direction, and the two arc separating parts of the lower arc separating plate 5-2u are stacked with the lower bottom wall in the first direction, that is, the upper arc separating plate and the lower arc separating plate 5-2u are located between the upper bottom wall and the lower bottom wall; the two arc extinguishing devices are respectively a first arc extinguishing device 4-1u and a second arc extinguishing device 4-2u arranged on the radial two sides of the moving contact mechanism 2u, and the two static contacts are respectively a first static contact 3-1u and a second static contact 3-2u arranged on the radial two sides of the moving contact mechanism 2u. A contact pair formed by a moving contact part cooperating with the static contact part of the first static contact 3-1u is a first contact pair, and the first contact pair corresponds to and cooperates with the first arc extinguishing device 4-1u. Another contact pair formed by a moving contact part cooperating with the static contact part of the second static contact 3-2u is a second contact pair. The two contact grooves 2-122u are respectively a first contact groove and a second contact groove cooperating with the first contact pair and the second contact pair. The second contact pair corresponds to and cooperates with the second arc extinguishing device 4-2u. The two arc passages are respectively a first arc passage and a second arc passage. The two ends of the first arc passage are respectively in relative communication with the first contact groove and the arc inlet of the first arc extinguishing device 4-1u. The two ends of the second arc passage are respectively in relative communication with the second contact groove and the arc inlet of the second arc extinguishing device 4-2u; the support 2-1u cooperates with the unit housing 1u to divide the internal space of the unit housing 1u into two parts, namely a first sub-space and a second sub-space; the first contact pair, the first arc passage, and the first arc extinguishing device 4-1u are always located in the first sub-space, and the second contact pair, the second arc passage, and the second arc extinguishing device 4-2u are always located in the second sub-space.

[0037] Specifically, both sets of the arc extinguishing devices are in a C-shaped structure. The two sets of arc extinguishing devices are arranged around the moving contact mechanism 2u along the rotation direction of the moving contact mechanism 2u, and the openings of the C-shaped structures of the two sets of arc extinguishing devices face each other. When the moving contact mechanism 2u is in the open position, in the rotation direction of the moving contact mechanism 2u, the moving contact part and the static contact part of each pair of contacts are respectively in relative cooperation with the two ends of the corresponding arc extinguishing device. Further, the arc extinguishing device can be realized by the prior art. For example, the arc extinguishing device includes arc extinguishing partitions and arc extinguishing grid sheets. The two sets of arc extinguishing partitions are arranged at intervals relative to each other in the first direction, and multiple arc extinguishing grid sheets are arranged around the moving contact mechanism 2u side by side at intervals. Further, the arc extinguishing device includes at least two arc extinguishing chambers arranged around the moving contact mechanism 2u along the rotation direction of the moving contact mechanism 2u. Each arc extinguishing chamber includes two sets of arc extinguishing chamber partitions arranged at intervals relative to each other in the first direction and multiple arc extinguishing grid sheets arranged side by side at intervals between the two sets of arc extinguishing chamber partitions. The arc extinguishing chamber partitions of each arc extinguishing chamber form the arc extinguishing partitions of the arc extinguishing device.

[0038] Specifically, as Figure 2-3 shown, the support 2-1u includes a bearing column arranged in the middle thereof and an annular groove surrounding the bearing column. The moving contact 2-2u is inserted into the bearing column, and both ends protrude from both sides of the bearing column respectively. Each end of the moving contact 2-2u has a moving contact part, and at least part of each moving contact part is located in the annular groove. The two bearing parts divide the annular groove into two arc-shaped grooves, namely two contact grooves 2-122u. Further, the support 2-1u includes a support cover 2-11u and a support seat 2-12u that are relatively assembled. The support cover 2-11u includes a cover plate 2-110u, and the support seat 2-12u includes a bearing column and a seat plate 2-120u. The cover plate 2-110u and the seat plate 2-120u are arranged at intervals relative to each other, and the bearing column is located between the cover plate 2-110u and the seat plate 2-120u in the first direction. The support 2-1u further includes a plug head and a jack portion respectively arranged at both circumferential ends thereof. The plug head includes a main plug and a sub-plug. The main plug is arranged on the side of the cover plate 2-110u facing away from the seat plate 2-120u, and the sub-plug is arranged at one end of the bearing column facing the cover plate 2-110u. The sub-plug passes through the support cover hole of the cover plate 2-110u and is arranged side by side with the main plug. The jack portion is arranged at one end of the support seat 2-12u facing away from the support cover 2-11u and is adapted to the plug head. The plug head is composed of the main plug and the sub-plug, which ensures the structural strength of the plug head. Moreover, the main plug and the sub-plug are respectively arranged on the support cover 2-11u and the support seat 2-12u, which ensures the action synchronization of the support cover 2-11u and the support seat 2-12u during the rotation of the support 2-1u.

[0039] As Figure 2-7As shown, the switch unit u further includes a communication air duct 55u arranged side by side and spaced apart from the arc passage along the first direction. When the moving contact mechanism 2u is in the open position, each contact groove 2-122u is connected to the arc inlet of the corresponding arc extinguishing device through at least one group of communication air ducts 55u; that is, the communication air duct 55u and the arc passage are arranged side by side and spaced apart in the first direction, and the two are two independent channels, which means that each contact groove 2-122u can not only be connected to the arc inlet of the corresponding arc extinguishing device through the corresponding arc passage, but also be connected to the arc inlet of the corresponding arc extinguishing device through the corresponding communication air duct 55u; the first contact groove is connected to the arc inlet of the first arc extinguishing device 4-1u through at least one group of communication air ducts 55u, and the second contact groove is connected to the arc inlet of the second arc extinguishing device 4-2u through at least one group of communication air ducts 55u. As Figure 7 As shown, a part of the hot air flow generated by the arc at the arc extinguishing device is discharged from the switch unit u, and a part of the hot air flow enters the corresponding contact groove 2-122u through the communication air duct 55u, which is beneficial to boosting the movement of the arc in the contact groove 2-122u and the arc passage towards the arc extinguishing device and entering the arc extinguishing device, thereby improving the transfer rate of the arc and avoiding or significantly reducing the burning of the moving / static contacts by the arc; in particular, when the rotary disconnector of the present invention is applied to a photovoltaic power generation system for interrupting high-voltage direct current, the cooperation relationship between the communication air duct 55u, the contact groove 2-122u and the arc extinguishing device can significantly improve the arc extinguishing performance. Further, the communication air duct 55u and the corresponding arc passage are located on both sides of the corresponding arc dividing plate; that is, the communication air duct 55u and the arc passage for connecting the same contact groove 2-122u and the arc extinguishing device are located on both sides of the corresponding arc dividing plate, the communication air duct 55u and the first arc passage for connecting the first contact groove and the first arc extinguishing device 4-1u are located on both sides of the corresponding arc dividing plate, and the communication air duct 55u and the second arc passage for connecting the second contact groove and the second arc extinguishing device 4-2u are located on both sides of the corresponding arc dividing plate. Further, when the moving contact mechanism 2u is in the open position, each contact groove 2-122u is connected to the arc inlet of the corresponding arc extinguishing device through a group of communication air ducts 55u.

[0040] Specifically, the switch unit u of this embodiment includes two groups of connected air channels 55u, namely a first connected air channel and a second connected air channel respectively arranged on the radial two sides of the moving contact mechanism 2u; in the radial direction of the moving contact mechanism 2u, both the first connected air channel and the first arc passage are located between the moving contact mechanism 2u and the first arc extinguishing device 4-1u, the first connected air channel and the first arc passage are arranged side by side and spaced apart along a first direction, both the second connected air channel and the second arc passage are located between the moving contact mechanism 2u and the second arc extinguishing device 4-2u, the second connected air channel and the second arc passage are arranged side by side and spaced apart along the first direction; when the moving contact mechanism 2u is in the open position, one end of the first connected air channel is communicated with the first contact groove and the other end is communicated with the arc inlet of the first arc extinguishing device, one end of the second connected air channel is communicated with the second contact groove and the other end is communicated with the arc inlet of the second arc extinguishing device. Further, the two groups of the connected air channels 55u are centrosymmetric structures with the rotation axis of the moving contact mechanism 2u as the central symmetry axis.

[0041] Further, the connected air channel 55u includes an inner port 55-1u communicated with the corresponding contact groove 2-122u and an outer port 55-3u communicated with the arc inlet of the corresponding arc extinguishing device, and the caliber of the outer port 55-3u is greater than or equal to that of the inner port 55-1u. Further, in this embodiment, the caliber of the outer port 55-3u is preferably greater than that of the inner port 55-1u, which is beneficial to the hot air flow generated by the arc at the arc extinguishing device to enter the connected air channel 55u, and when the hot air flow flows through the connected air channel 55u and sprays out from the small port end, the air flow velocity is greater, which is more beneficial to push the arc in the contact groove 2-122u and the arc passage towards the corresponding arc extinguishing device, thereby improving the arc extinguishing efficiency.

[0042] Specifically, as Figure 5 shown, the connected air channel 55u is a trumpet-shaped air channel, and the caliber of its outer port 55-3u (large port end) is greater than that of the inner port 55-1u (small port end).

[0043] As another embodiment, the connected air channel 55u is an air channel with a substantially constant pipe diameter, and the caliber of the outer port 55-3u is substantially the same as that of the inner port 55-1u.

[0044] Further, one end of the connected air channel 55u communicated with the arc inlet of the arc extinguishing device (that is, the outer port 55-3u of the connected air channel 55u) is arranged close to the corresponding static contact part (that is, the static contact part of the contact pair cooperating with the corresponding arc extinguishing device), which is beneficial to the hot air flow generated by the arc at the initial stage to enter the contact groove 2-122u through the connected air channel 55u, so as to more efficiently push the arc in the contact groove 2-122u and the arc passage towards the arc extinguishing device.

[0045] Specifically, the channel groove 55-2u is a trumpet-shaped groove, whose small end is connected to the inner port 55-1u and whose large end is connected to the outer port 55-3u. Further, on the side wall of the contact groove 2-122u, there are support inlets 2-121u that are relatively communicated with the corresponding communication air channels 55u. The two groups of support inlets 2-121u are respectively arranged at the radial two ends of the support 2-1u and are respectively communicated with the two groups of arc extinguishing devices through the communication air channels 55u.

[0046] As another embodiment of the channel groove 55-2u, the channel groove 55-2u is a groove with a uniform width throughout.

[0047] Such as Figure 2 , 4 -5 shows an implementation manner of the communication air channel 55u: The communication air channel 55u is arranged on the arc separating part. Each communication air channel 55u includes an outer port 55-3u, a channel groove 55-2u, and an inner port 55-1u that are arranged on the corresponding arc separating part and are connected in sequence. The outer port 55-3u is relatively communicated with the arc inlet of the corresponding arc extinguishing device. The inner port 55-1u is relatively communicated with the corresponding contact groove 2-122u. The channel groove 55-2u is arranged on one side of the corresponding arc separating part facing the bottom wall (upper bottom wall or lower bottom wall) of the corresponding unit housing 1u. Then, the arc separating part provided with the channel groove 55-2u and the bottom wall of the corresponding unit housing 1u are stacked together in the first direction, and the bottom wall of the unit housing 1u encloses the channel groove 55-2u into a communication air channel 55u; The communication air channel 55u for connecting the arc inlet of the first contact groove and the first arc extinguishing device 4-1u is arranged on the first arc separating part 52u of the upper arc separating plate or the lower arc separating plate 5-2u, and the communication air channel 55u for connecting the arc inlet of the second contact groove and the second arc extinguishing device 4-2u is arranged on the second arc separating part 53u of the upper arc separating plate or the lower arc separating plate 5-2u.

[0048] Further, both the upper arc partition plate and the lower arc partition plate 5-2u are provided with arc partition plate mounting grooves 51u, and the arc partition plate mounting grooves 51u are formed between two corresponding arc partition parts. That is, the arc partition plate mounting groove 51u of the upper arc partition plate is formed between the two arc partition parts of the upper arc partition plate, and the arc partition plate mounting groove 51u of the lower arc partition plate 5-2u is formed between the two arc partition parts of the lower arc partition plate 5-2u; the support 2-1u includes a cover plate 2-110u and a seat plate 2-120u that are relatively spaced apart in the first direction, and the moving contact 2-2u is clamped between the cover plate 2-110u and the seat plate 2-120u. Two contact grooves 2-122u are formed between the cover plate 2-110u and the seat plate 2-120u. The cover plate 2-110u and the seat plate 2-120u are respectively rotatably arranged in the two arc partition plate mounting grooves 51u (that is, the arc partition plate mounting groove 51u of the upper arc partition plate and the arc partition plate mounting groove 51u of the lower arc partition plate 5-2u); the communication air duct 55u is arranged on the arc partition part corresponding to the arc partition plate mounting groove 51u, and one end is used for relatively communicating with the corresponding support inlet 2-121u. Further, the inner port 55-1u of the communication air duct 55u is arranged on the side wall of the corresponding arc partition plate mounting groove 51u and is used for relatively communicating with the corresponding support inlet 2-121u. Further, both the cover plate 2-110u and the seat plate 2-120u are circular plate structures, the arc partition plate mounting groove 51u is a circular groove, and the outer diameters of the cover plate 2-110u and the seat plate 2-120u are adapted to the inner diameter of the arc partition plate mounting groove 51u. That is, a reasonable gap is provided between the circumferential side walls of the cover plate 2-110u and the seat plate 2-120u and the circumferential side walls of their respective corresponding arc partition plate mounting grooves 51u to ensure the smooth sliding of the cover plate 2-110u and the seat plate 2-120u. During assembly, the two arc partition plate mounting grooves 51u basically accurately limit the support 2-1u in the working position.

[0049] Further, both the upper arc partition plate and the lower arc partition plate 5-2u include arc partition plate connecting parts and arc partition parts. The arc partition plate connecting parts are respectively connected to the two arc partition parts. The two arc partition parts are relatively arranged and cooperate with the arc partition plate connecting parts to enclose the arc partition plate mounting groove 51u. The arc partition plate connecting parts are also provided with arc partition part shaft holes 54u, and the axial two ends of the support 2-1u are respectively rotatably arranged in the two arc partition part shaft holes 54u. Further, the arc partition plate mounting groove 51u is a circular groove and is coaxially arranged with the arc partition part shaft hole 54u. Further, the upper arc partition plate is an integral structure; the lower arc partition plate 5-2u is an integral structure; the upper arc partition plate and the lower arc partition plate are preferably symmetric structures.

[0050] Further, the outer edge of each of the arc separating portions (i.e., the edge of the arc separating portion away from the moving contact mechanism 2u) abuts against the inner edge of the arc extinguishing partition of the corresponding arc extinguishing device (i.e., the edge of the arc extinguishing partition close to the moving contact mechanism 2u), and the outer port 55-3u of the air communication channel 55u is arranged on the outer edge of the corresponding arc separating portion; in the first direction, the thickness of the arc separating portion is greater than the thickness of the corresponding arc extinguishing partition, and the depth of the outer port 55-3u is greater than the thickness of the arc extinguishing partition.

[0051] Specifically, as Figure 3 shown, each of the support inlets 2-121u is arranged on the outer edge of the cover plate 2-110u or the seat plate 2-120u, and the support inlet 2-121u is a notch arranged on the outer edge of the cover plate 2-110u or the seat plate 2-120u. Further, in the switch unit u of this embodiment, the two support inlets 2-121u are respectively arranged at the radial two ends of the seat plate 2-120u, and the two groups of air communication channels 55u are respectively arranged on the two arc separating portions (i.e., the first arc separating portion 52u and the second arc separating portion 53u) of the lower arc separating plate 5-2u. Alternatively, the two groups of air communication channels 55u can also be respectively arranged on the two arc separating portions of the upper arc separating plate, and then the two support inlets 2-121u are arranged on the cover plate 2-110u of the support 2-1u; or, the air communication channels 55u are arranged on each arc separating portion of the upper arc separating plate and the lower arc separating plate, and the cover plate 2-110u and the seat plate 2-120u of the support 2-1u are also provided with support inlets 2-121u.

[0052] As another embodiment of the air communication channel 55u, the air communication channel 55u is a pipe structure arranged inside the corresponding arc separating portion, that is, except for the two ends being provided with openings, the other parts of the air communication channel 55u are all closed structures.

[0053] As another embodiment of the air communication channel 55u, the air communication channel 55u is arranged on the bottom wall of the unit housing 1u.

[0054] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use, and is only for the convenience of description, rather than indicating that the device or element referred to must have a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0055] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present utility model.

Claims

1. A switching unit, which comprises a unit housing (1u), a moving contact mechanism (2u), a static contact, an arc extinguishing device, and an arc separating plate respectively arranged in the unit housing (1u); the moving contact mechanism (2u) comprises a rotatably arranged support (2-1u) and a moving contact (2-2u) arranged on the support (2-1u), the rotation axis direction of the support (2-1u) is the first direction, the moving contact (2-2u) comprises a moving contact part, and two groups of moving contact parts cooperate with the static contact parts of two groups of static contacts respectively to form two groups of contact pairs; the support (2-1u) comprises contact grooves (2-122u), the two groups of contact grooves (2-122u) respectively cooperate with the two groups of contact pairs, are located in the middle of the axis direction and at both radial ends of the support (2-1u), at least part of each moving contact part is located in the corresponding contact groove (2-122u), and each static contact part is inserted into the corresponding contact groove (2-122u) for closing and disconnecting with the corresponding moving contact part; the two groups of arc separating plates are arranged at intervals relative to each other along the first direction, and two groups of arc passageways respectively arranged on both radial sides of the support (2-1u) are formed therebetween; the two groups of arc extinguishing devices are respectively arranged on both sides of the two groups of arc passageways along the radial direction of the support (2-1u), one end of each arc passageway is communicated with the corresponding contact groove (2-122u) relatively, and the other end is communicated with the arc inlet of the corresponding arc extinguishing device relatively; It is characterized in that: The switching unit further comprises a communication air passage (55u) arranged side by side and at intervals with the arc passageway along the first direction. When the moving contact mechanism (2u) is in the open position, each contact groove (2-122u) is communicated with the arc inlet of the corresponding arc extinguishing device through at least one group of communication air passages (55u).

2. The switching unit according to claim 1, characterized in that: The communication air passage (55u) comprises an inner port (55-1u) communicated with the corresponding contact groove (2-122u) and an outer port (55-3u) communicated with the arc inlet of the corresponding arc extinguishing device, and the diameter of the outer port (55-3u) is greater than or equal to that of the inner port (55-1u).

3. The switch unit according to claim 1, characterized in that: When the moving contact mechanism (2u) is in the open position, in the rotation direction of the moving contact mechanism (2u), the two ends of each contact groove (2-122u) respectively accommodate the moving contact part and the static contact part of the corresponding contact pair, and one end of the communication air passage (55u) connected with the contact groove (2-122u) is located between the moving contact part and the static contact part in the contact groove (2-122u).

4. The switch unit according to claim 3, wherein: Each contact groove (2-122u) is communicated with the arc inlet of the corresponding arc extinguishing device through one group of communication air passages (55u), and one end of the communication air passage (55u) connected with the arc inlet of the arc extinguishing device is arranged close to the corresponding static contact part.

5. The switch unit according to claim 1, characterized in that: The communication air passage (55u) and the corresponding arc passageway are respectively located on both sides of the corresponding arc separating plate.

6. The switch unit according to claim 1, characterized in that: The two sets of arc separating plates are respectively an upper arc separating plate and a lower arc separating plate (5-2u), and both include two arc separating parts respectively arranged on the radial two sides of the support (2-1u), namely a first arc separating part (52u) and a second arc separating part (53u). The two first arc separating parts (52u) face each other in the first direction and form an arc passage therebetween. The two second arc separating parts (53u) face each other in the first direction and form another arc passage therebetween. The two bottom walls of the unit housing (1u) arranged at intervals relative to each other in the first direction are respectively an upper bottom wall and a lower bottom wall. The moving contact mechanism (2u), two sets of static contacts, two sets of arc separating plates and two sets of arc extinguishing devices are all located between the upper bottom wall and the lower bottom wall. The two arc separating parts of the upper arc separating plate are stacked with the upper bottom wall in the first direction, and the two arc separating parts of the lower arc separating plate (5-2u) are stacked with the lower bottom wall in the first direction.

7. The switching unit according to claim 6, characterized in that: The communication air channels (55u) are arranged on the arc separating parts. Each communication air channel (55u) includes an outer port (55-3u), a channel groove (55-2u) and an inner port (55-1u) which are arranged on the corresponding arc separating part and are connected in sequence. The outer port (55-3u) is relatively communicated with the arc inlet of the corresponding arc extinguishing device, the inner port (55-1u) is relatively communicated with the corresponding contact groove (2-122u), and the channel groove (55-2u) is arranged on the side of the corresponding arc separating part facing the bottom wall of the corresponding unit housing (1u).

8. The switch unit according to claim 6, characterized in that: Support inlets (2-121u) which are relatively communicated with the corresponding communication air channels (55u) are arranged on the side walls of the contact grooves (2-122u). The two sets of support inlets (2-121u) are respectively arranged at the two radial ends of the support (2-1u) and are communicated with the two sets of arc extinguishing devices respectively through the communication air channels (55u).

9. The switch unit according to claim 8, wherein: The upper arc separating plate and the lower arc separating plate (5-2u) are both provided with arc separating plate mounting grooves (51u). Each arc separating plate mounting groove (51u) is formed between the corresponding two arc separating parts. The support (2-1u) includes a cover plate (2-110u) and a seat plate (2-120u) arranged at intervals relative to each other in the first direction. The moving contact (2-2u) is clamped between the cover plate (2-110u) and the seat plate (2-120u). Two contact grooves (2-122u) are formed between the cover plate (2-110u) and the seat plate (2-120u). The cover plate (2-110u) and the seat plate (2-120u) are respectively rotatably arranged in the two arc separating plate mounting grooves (51u). The communication air channels (55u) are arranged on the arc separating parts corresponding to the arc separating plate mounting grooves (51u), and one end is used for being relatively communicated with the corresponding support inlet (2-121u).

10. The switch unit according to claim 9, characterized in that: The upper arc separating plate is of an integral structure; and / or, the lower arc separating plate (5-2u) is of an integral structure.

11. The switch unit according to claim 6, characterized in that: When the moving contact mechanism (2u) is in the open position, each contact groove (2-122u) is communicated with the arc inlet of the corresponding arc extinguishing device through a set of communication air channels (55u), and the two sets of communication air channels (55u) are of a central symmetry structure with the rotation axis of the moving contact mechanism (2u) as the central symmetry axis.

12. The switch unit according to claim 1, wherein: In the first direction, the height of each contact groove (2-122u) ≤ the height of the corresponding arc passage, and the height of each arc passage is less than the width of the arc extinguishing grid plate (4-30u) of the corresponding arc extinguishing device.

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