Switch unit

Abstract

The invention 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 structure 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] This invention relates to the field of low-voltage electrical appliances, and more specifically to a switching unit. Background Technology

[0002] A rotary disconnector typically includes an operating handle, an operating mechanism, and a switch body. The switch body comprises multiple stacked switch units. Each switch unit includes a unit housing and a contact system and an arc-extinguishing device respectively housed within the unit housing. The contact system includes a rotatably mounted moving contact mechanism and a pair of stationary contacts. The operating mechanism is kinetically connected to the moving contact mechanism. External force rotates the operating handle, which in turn drives each moving contact mechanism to close and open with its corresponding stationary contact. The arc-extinguishing device is used to extinguish the arc generated by the contact system. In existing rotary disconnectors, the arc generated by the breaking of the moving / stationary contacts cannot be transferred in a timely manner, leading to burn-in of the moving and stationary contacts and affecting their service life. Summary of the Invention

[0003] The purpose of this invention is to overcome at least one defect of the prior art and provide a switching unit with good arc extinguishing performance.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A switching unit includes a unit housing and a moving contact mechanism, a stationary contact, an arc-extinguishing device, and an arc-blocking plate respectively disposed within the unit housing. The moving contact mechanism includes a rotatably mounted support and moving contacts disposed on the support. The rotation axis of the support is a first direction. The moving contacts include moving contact portions. Two sets of moving contact portions respectively cooperate with the stationary contact portions of two sets of stationary contacts to form two sets of contact pairs. The support includes contact grooves. Two sets of contact grooves respectively cooperate with the two sets of contact pairs and are located at the axial center and radial ends of the support. At least a portion of each moving contact portion is located in the corresponding contact groove. Each stationary contact portion is inserted into the corresponding contact groove for closing and opening with the corresponding moving contact portion. The two sets of arc-blocking plates are arranged relatively spaced apart along the first direction and form two sets of arc passages respectively arranged on both radial sides of the support. Two sets of arc-extinguishing devices are arranged on both sides of the two sets of arc passages along the radial direction of the support. One end of each arc passage is relatively connected to the corresponding contact groove and the other end is relatively connected to the arc inlet of the corresponding arc-extinguishing device.

[0006] The switching unit also includes connecting air channels arranged parallel to and spaced apart from the arc passage along the first direction. When the moving contact structure is in the open position, each contact groove is connected to the arc inlet of the corresponding arc extinguishing device through at least one set of connecting air channels.

[0007] Furthermore, the connecting air passage includes an inner port connected to the corresponding contact groove and an outer port connected to the arc inlet of the corresponding arc extinguishing device, wherein the diameter of the outer port is greater than or equal to that of the inner port.

[0008] Furthermore, when the moving contact mechanism is in the disconnected position, in the rotation direction of the moving contact mechanism, each contact groove has a moving contact part and a stationary contact part of the corresponding contact pair at both ends, and the end of the connecting air passage that is connected to the contact groove is located between the moving contact part and the stationary contact part in the contact groove.

[0009] Furthermore, each of the contact grooves is connected to the arc inlet of the corresponding arc extinguishing device through a set of connecting air passages, with one end of the connecting air passage connected to the arc inlet of the arc extinguishing device located close to the corresponding static contact portion.

[0010] Furthermore, the connecting air passage and the corresponding arc passage are located on both sides of the corresponding arc-blocking plate.

[0011] Furthermore, the two sets of arc-blocking plates are an upper arc-blocking plate and a lower arc-blocking plate, each including two arc-blocking parts arranged on the radial sides of the support, namely a first arc-blocking part and a second arc-blocking part. The two first arc-blocking parts are opposite to each other along a first direction and form an arc passage between them, and the two second arc-blocking parts are opposite to each other along the first direction and form another arc passage between them. The two bottom walls of the unit shell are arranged at intervals along the first direction, namely an upper bottom wall and a lower bottom wall. The moving contact mechanism, two sets of stationary contacts, two sets of arc-blocking plates, and two sets of arc-extinguishing devices are all located between the upper bottom wall and the lower bottom wall. The two arc-blocking parts of the upper arc-blocking plate are stacked together with the upper bottom wall along the first direction, and the two arc-blocking parts of the lower arc-blocking plate are stacked together with the lower bottom wall along the first direction.

[0012] Furthermore, the connecting air passages are arranged on the arc-blocking part, and each connecting air passage includes an outer port, a channel groove and an inner port arranged on the corresponding arc-blocking part and connected in sequence. The outer port is connected to the arc inlet of the corresponding arc-extinguishing device, the inner port is connected to the corresponding contact groove, and the channel groove is arranged on the bottom wall side of the corresponding arc-blocking part facing the corresponding unit shell.

[0013] Furthermore, the sidewall of the contact groove is provided with a support inlet that is connected to the corresponding connecting air passage. The two sets of support inlets are respectively located at the radial ends of the support and are connected to the two sets of arc extinguishing devices through the connecting air passage.

[0014] Furthermore, both the upper and lower arc-blocking plates are provided with arc-blocking plate mounting grooves, each arc-blocking plate mounting groove being formed between two corresponding arc-blocking portions; the support includes a cover plate and a seat plate arranged at relative intervals along a first direction, a moving contact being sandwiched between the cover plate and the seat plate, two contact grooves being formed between the cover plate and the seat plate, and the cover plate and the seat plate being rotatably disposed in the two arc-blocking plate mounting grooves respectively; the connecting air passage is provided on the arc-blocking portion corresponding to the arc-blocking plate mounting groove, one end of which is used to communicate with the corresponding support inlet.

[0015] Furthermore, the upper arc-blocking plate is a one-piece structure; and / or, the lower arc-blocking plate is a one-piece structure.

[0016] Furthermore, when the moving contact mechanism is in the disconnected position, each contact groove is connected to the arc inlet of the corresponding arc extinguishing device through a set of connecting air channels. The two sets of connecting air channels are mutually symmetrical about the rotation axis of the moving contact mechanism.

[0017] Furthermore, in the first direction, the height of each contact groove is less than or equal to 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 of the corresponding arc-extinguishing device.

[0018] In the switching unit of the present invention, the arc generated by the separation of the moving contact mechanism and the stationary contact generates a hot airflow in the arc extinguishing device. Part of the hot airflow is discharged from the switching unit u, while part of the hot airflow enters the corresponding contact groove through the connecting air passage. This facilitates the movement of the arc in the contact groove and the arc passage towards the arc extinguishing device and into the arc extinguishing device, thereby improving the arc transfer rate and avoiding or significantly reducing the burn damage of the moving / stationary contacts caused by the arc.

[0019] Furthermore, the connecting air passage is a funnel-shaped air passage, which facilitates the entry of hot air into the connecting air passage. When the hot air flows through the connecting air passage and is ejected from the small end, the airflow velocity is greater, which is more conducive to pushing the electric arc in the contact groove and the electric arc passage towards the corresponding arc extinguishing device, thereby improving the arc extinguishing efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the disconnecting switch of the present invention;

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the switching unit of the present invention;

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

[0023] Figure 4 This is a schematic diagram of the arc-blocking plate of the present invention from one perspective;

[0024] Figure 5 This is a schematic diagram of the arc-blocking plate of the present invention from another perspective;

[0025] Figure 6 This is a projected view of the switching unit of the present invention;

[0026] Figure 7 This is a cross-sectional view of the switching unit of the present invention, showing the flow path of the hot gas flow.

[0027] Explanation of reference numerals in the attached figures

[0028] operating handle 1;

[0029] Operating mechanism 2;

[0030] Switch body b;

[0031] Switch unit u; unit housing 1u; contact system c, moving contact mechanism 2u, support 2-1u, support cover 2-11u, cover plate 2-110u, support seat 2-12u, seat plate 2-120u, support inlet 2-121u, contact groove 2-122u, moving contact 2-2u, first stationary contact 3-1u, second stationary contact 3-2u; first arc extinguishing device 4-1u, second arc extinguishing device 4-2u; arc extinguishing grid 4-30u, lower arc diaphragm 5-2u, arc diaphragm mounting groove 51u, first arc diaphragm part 52u, second arc diaphragm part 53u, arc diaphragm part shaft hole 54u, connecting air passage 55u, inner port 55-1u, channel groove 55-2u, outer port 55-3u. Detailed Implementation

[0032] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the disconnecting switch of the present invention. The disconnecting switch of the present invention is not limited to the descriptions in the following embodiments.

[0033] like Figure 1 As shown, the disconnecting switch of the present invention is preferably a rotary disconnecting 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 disposed within the unit shell 1. The contact system c includes a moving contact mechanism 2u and two sets of stationary contacts that cooperate with each other. The moving contact mechanism 2u includes a support 2-1u rotatably disposed on the unit shell 1u and a moving contact 2-2u disposed on the support 2-1u. The moving contact mechanism 2u is rotatably disposed through the support 2-1u and its rotation axis is the same as the first direction. The moving contact 2-2u includes two sets of moving contact portions. The two sets of moving contact portions cooperate with the stationary contact portions of the two sets of stationary contacts to form two sets of contact pairs. The operating mechanism 2 is throttle-connected to the support 2-1u and drives each moving contact mechanism 2u to rotate so that it closes and opens with the corresponding two sets of stationary contacts (that is, it closes and opens the corresponding two sets of contact pairs), that is, it drives each switch unit u to close and open. The operating mechanism 2 can be implemented by existing technology and will not be described in detail here. The disconnect 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 can turn the operating handle 1 to drive each switch unit u to close and open through the operating mechanism 2.

[0034] like Figure 2 , 6 The image shows one embodiment of the switching unit u.

[0035] The switching unit u also includes two sets of arc extinguishing devices and two sets of arc-isolating plates respectively disposed within the unit housing 1u. The two sets of arc extinguishing devices are respectively disposed on both radial sides of the moving contact mechanism 2u and respectively cooperate with the two sets of contact pairs, and are used to extinguish the electric arc generated by the closing and opening of the two sets of contact pairs. The two sets of arc-isolating plates are arranged relatively spaced apart along the first direction, forming two sets of electric arc passages between them. The two sets of electric arc passages are respectively located on both radial sides of the moving contact mechanism 2u and are located between the two sets of arc extinguishing devices along the radial direction of the moving contact mechanism 2u. One end of each set of electric arc passages is relatively connected to 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. Two sets of contact grooves 2-122u respectively mate with two sets of contact pairs and are located at the axial center and radial ends of the support 2-1u. That is, the contact grooves 2-122u mate one-to-one with the contact pairs. Both sets of contact grooves 2-122u are located at the center of the support 2-1u in the axial direction (i.e., the first direction), and are located at the radial ends of the support 2-1u (the radial direction of the support 2-1u is perpendicular to the first direction). At least a portion of each moving contact is located within the corresponding contact groove 2-122u, and each stationary contact is inserted into the corresponding contact groove 2-122u and closes and opens with the corresponding moving contact. That is, during the rotation of the moving contact mechanism 2u, the stationary contact is always inserted into the corresponding contact groove 2-122u, and the moving contact closes and opens with the corresponding stationary contact as the moving contact mechanism 2u rotates. The contact groove 2-122u is preferably a slit structure, which facilitates the rapid transfer of the electric arc generated by the contact pair, thereby reducing damage to the moving and stationary contacts. The two sets of arc channels are respectively arranged on both sides of the two sets of contact grooves 2-122u along the radial direction of the moving contact mechanism 2u. The contact grooves 2-122u, the arc channels, and the arc extinguishing devices are matched one-to-one. One end of each arc channel is relatively connected to the corresponding contact groove 2-122u and the other end is relatively connected to the arc inlet of the corresponding arc extinguishing device. In the first direction, the height of each contact groove 2-122u is less than or equal to the height of the corresponding arc channel, and the height of each arc channel is less than the width of the arc extinguishing grid plate 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 adjacent arc extinguishing grid plates 4-30u of the corresponding arc extinguishing device. This is conducive to the transfer of the arc from the moving contact mechanism 2u to the arc extinguishing device, and promotes the arc to enter the arc extinguishing device more quickly, thereby improving the arc extinguishing efficiency.

[0036] Specifically, such as Figure 2 , 6As shown, the two sets of arc-blocking plates are a first arc-blocking plate (not shown in the figure) and a second arc-blocking plate 5-2u arranged side by side along the first direction. Each arc-blocking plate includes two arc-blocking parts arranged on the radial sides of the support 2-1u, namely a first arc-blocking part 52u and a second arc-blocking part 53u. The two first arc-blocking parts 52u are arranged relatively apart along the first direction to form an arc passage, and the two second arc-blocking parts 53u are arranged relatively apart along the first direction to form another arc passage. The unit shell 1 includes two bottom walls arranged relatively apart along the first direction, namely... The upper bottom wall (not shown in the figure) and the lower bottom wall; the two arc-blocking portions of the upper arc-blocking plate are stacked together with the upper bottom wall along the first direction, and the two arc-blocking portions of the lower arc-blocking plate 5-2u are stacked together with the lower bottom wall along the first direction, that is, the upper arc-blocking plate and the lower arc-blocking plate 5-2u are located between the upper bottom wall and the lower bottom wall; the two sets of arc-extinguishing devices are the first arc-extinguishing device 4-1u and the second arc-extinguishing device 4-2u respectively arranged on the radial sides of the moving contact mechanism 2u, and the two sets of stationary contacts are the first stationary contact 3-1u and the second stationary contact respectively arranged on the radial sides of the moving contact mechanism 2u. 3-2u, a first contact pair is formed by the mating of a moving contact portion with the stationary contact portion of the first stationary contact 3-1u. This first contact pair corresponds to the first arc-extinguishing device 4-1u. A second contact pair is formed by the mating of another moving contact portion with the stationary contact portion of the second stationary contact 3-2u. Two contact grooves 2-122u are respectively the first contact groove and the second contact groove that mate with the first and second contact pairs. The second contact pair corresponds to the second arc-extinguishing device 4-2u. Two arc channels are the first arc channel and the second arc channel, respectively. The first arc... The two ends of the passage are respectively connected to the arc inlet of the first contact groove and the first arc extinguishing device 4-1u, and the two ends of the second arc passage are respectively connected to the arc inlet of the second contact groove and the second arc extinguishing device 4-2u; the support 2-1u cooperates with the unit shell 1u to divide the internal space of the unit shell 1u into two parts, namely the first subspace and the second subspace; the first contact pair, the first arc passage, and the first arc extinguishing device 4-1u are always located in the first subspace, and the second contact pair, the second arc passage, and the second arc extinguishing device 4-2u are always located in the second subspace.

[0037] Specifically, both sets of arc-extinguishing devices are C-shaped structures, arranged around the moving contact mechanism 2u along its rotation direction, with the openings of the C-shaped structures facing each other. When the moving contact mechanism 2u is in the open position, the moving and stationary contact portions of each contact pair respectively mate with the two ends of the corresponding arc-extinguishing device along its rotation direction. Furthermore, the arc-extinguishing devices can be implemented using existing technology, for example: the arc-extinguishing device includes arc-extinguishing baffles and arc-extinguishing grids, with two sets of arc-extinguishing baffles spaced apart relative to each other along a first direction, and multiple arc-extinguishing grids arranged side-by-side and spaced apart around the moving contact mechanism 2u. Furthermore, 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 relative intervals along a first direction and multiple arc extinguishing grid plates 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 constitute the arc extinguishing partitions of the arc extinguishing device.

[0038] Specifically, such as Figure 2-3 As shown, the support 2-1u includes a support column disposed in the middle and an annular groove surrounding the support column. The moving contact 2-2u is inserted into the support column and its two ends protrude from both sides of the support column. Each end of the moving contact 2-2u has a moving contact portion. At least part of each moving contact portion is located in the annular groove. The two support portions divide the annular groove into two arc-shaped grooves, which are two contact grooves 2-122u. Furthermore, the support 2-1u includes a support cover 2-11u and a support base 2-12u that are assembled relative to each other. The support cover 2-11u includes a cover plate 2-110u, and the support base 2-12u includes a support column and a base plate 2-120u. The cover plate 2-110u and the base plate 2-120u are arranged at intervals relative to each other, and the support column is located between the cover plate 2-110u and the base plate 2-120u along a first direction. The support 2-1u also includes a plug portion and a socket portion respectively disposed at its two circumferential ends. The plug portion includes a main plug and a secondary plug, and the main plug is disposed on the cover plate 2-110u opposite to the base plate 2-110u. On one side of 20u, the auxiliary plug is located on the end of the bearing column facing the cover plate 2-110u. The auxiliary plug passes through the support cover hole of the cover plate 2-110u and is parallel to the main plug. The insertion hole is located on the end of the support seat 2-12u away from the support cover 2-11u and is adapted to the plug part. The plug part is composed of the main plug and the auxiliary plug, which ensures the structural strength of the plug part. Moreover, the main plug and the auxiliary plug are respectively located on the support cover 2-11u and the support seat 2-12u, which ensures the synchronization of the movement of the support cover 2-11u and the support seat 2-12u during the rotation of the support 2-12u.

[0039] like Figure 2-7As shown, the switching unit u also includes connecting air channels 55u arranged parallel to 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 set of connecting air channels 55u; that is, the connecting air channels 55u and the arc passage are arranged parallel to and spaced apart along the first direction, and they are two sets of independent channels. This means that each contact groove 2-122u can be connected not only to the arc inlet of the corresponding arc extinguishing device through the corresponding arc passage, but also to the arc inlet of the corresponding arc extinguishing device through the corresponding connecting air channel 55u; the first contact groove is connected to the arc inlet of the first arc extinguishing device 4-1u through at least one set of connecting air channels 55u, and the second contact groove is connected to the arc inlet of the second arc extinguishing device 4-2u through at least one set of connecting air channels 55u. Figure 7 As shown, part of the hot airflow generated by the arc at the arc extinguishing device is discharged from the switch unit u, while part of the hot airflow enters the corresponding contact groove 2-122u through the connecting air passage 55u. This facilitates the movement of the arc in the contact groove 2-122u and the arc passage towards the arc extinguishing device and into the arc extinguishing device, thereby improving the arc transfer rate and avoiding or significantly reducing the burn damage of the moving / stationary contacts to the arc. In particular, when the rotary disconnecting switch of the present invention is applied to a photovoltaic power generation system for interrupting high-voltage direct current, the coordination between the connecting air passage 55u, the contact groove 2-122u and the arc extinguishing device can significantly improve the arc extinguishing performance. Furthermore, the connecting air passage 55u and the corresponding arc passage are located on both sides of the corresponding arc-blocking plate. That is, the connecting air passage 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-blocking plate; the connecting air passage 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-blocking plate; and the connecting air passage 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-blocking plate. Furthermore, 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 set of connecting air passages 55u.

[0040] Specifically, the switching unit u in this embodiment includes two sets of connecting air channels 55u, namely a first connecting air channel and a second connecting air channel respectively disposed on both radial sides of the moving contact mechanism 2u; in the radial direction of the moving contact mechanism 2u, the first connecting air channel and the first arc passage are both located between the moving contact mechanism 2u and the first arc extinguishing device 4-1u, and the first connecting air channel and the first arc passage are arranged side by side with intervals along a first direction; the second connecting air channel and the second arc passage are both located between the moving contact mechanism 2u and the second arc extinguishing device 4-2u, and the second connecting air channel and the second arc passage are arranged side by side with intervals along the first direction; when the moving contact mechanism 2u is in the open position, one end of the first connecting air channel is connected to the first contact groove and the other end is connected to the arc inlet of the first arc extinguishing device, and one end of the second connecting air channel is connected to the second contact groove and the other end is connected to the arc inlet of the second arc extinguishing device. Furthermore, the two sets of connecting air channels 55u are centrally symmetrical about the rotation axis of the moving contact mechanism 2u.

[0041] Furthermore, the connecting air passage 55u includes an inner port 55-1u communicating with the corresponding contact groove 2-122u and an outer port 55-3u communicating with the arc inlet of the corresponding arc extinguishing device. The diameter of the outer port 55-3u is greater than or equal to the diameter of the inner port 55-1u. Further, in this embodiment, the diameter of the outer port 55-3u is preferably larger than the diameter of the inner port 55-1u. This facilitates the entry of the hot airflow generated by the arc at the arc extinguishing device into the connecting air passage 55u. Moreover, when the hot airflow exits from the small opening of the connecting air passage 55u, the airflow velocity is greater, which is more conducive to pushing 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, such as Figure 5 As shown, the connecting airway 55u is a horn-shaped airway, and the diameter of its outer port 55-3u (large port end) is larger than the diameter of its inner port 55-1u (small port end).

[0043] In another embodiment, the connecting airway 55u is an airway with a basically constant diameter, and the diameter of the outer port 55-3u is basically the same as the diameter of the inner port 55-1u.

[0044] Furthermore, the end of the connecting air passage 55u that connects to the arc inlet of the arc extinguishing device (that is, the outer port 55-3u of the connecting air passage 55u) is located close to the corresponding static contact part (that is, the static contact part of the contact pair that cooperates with the corresponding arc extinguishing device). This facilitates the flow of hot air through the connecting air passage 55u into the contact groove 2-122u when the arc initially generates hot air, thereby more efficiently pushing 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 horn-shaped groove, with its small end connected to the inner port 55-1u and its large end connected to the outer port 55-3u. Further, the side wall of the contact groove 2-122u is provided with a support inlet 2-121u that communicates with the corresponding connecting air passage 55u. Two sets of support inlets 2-121u are respectively located at the radial ends of the support 2-1u and are respectively connected to two sets of arc-extinguishing devices through the connecting air passage 55u.

[0046] In another embodiment of the channel groove 55-2u, the channel groove 55-2u is a groove of equal width throughout its entire length.

[0047] like Figure 2 , 4 As shown in Figure -5, one implementation of the connecting air passage 55u is as follows: The connecting air passage 55u is disposed on the arc-blocking part. Each connecting air passage 55u includes an outer port 55-3u, a channel groove 55-2u, and an inner port 55-1u, which are disposed on the corresponding arc-blocking part and connected in sequence. The outer port 55-3u is in relative communication with the arc inlet of the corresponding arc-extinguishing device, and the inner port 55-1u is in relative communication with the corresponding contact groove 2-122u. The channel groove 55-2u is disposed on the side of the corresponding arc-blocking part facing the bottom wall (upper bottom wall or lower bottom wall) of the corresponding unit shell 1u. The arc-blocking portion with channel groove 55-2u is stacked together with the bottom wall of the corresponding unit shell 1u along the first direction. The bottom wall of the unit shell 1u encloses the channel groove 55-2u into a connecting air passage 55u. The connecting air passage 55u for connecting the first contact groove and the arc inlet of the first arc extinguishing device 4-1u is provided on the first arc-blocking portion 52u of the upper arc-blocking plate or the lower arc-blocking plate 5-2u. The connecting air passage 55u for connecting the second contact groove and the arc inlet of the second arc extinguishing device 4-2u is provided on the second arc-blocking portion 53u of the upper arc-blocking plate or the lower arc-blocking plate 5-2u.

[0048] Furthermore, both the upper and lower arc-blocking plates 5-2u are provided with arc-blocking plate mounting grooves 51u, which are formed between corresponding two arc-blocking portions. That is, the arc-blocking plate mounting groove 51u of the upper arc-blocking plate is formed between the two arc-blocking portions of the upper arc-blocking plate, and the arc-blocking plate mounting groove 51u of the lower arc-blocking plate 5-2u is formed between the two arc-blocking portions of the lower arc-blocking plate 5-2u. The support 2-1u includes a cover plate 2-110u and a seat plate 2-120u that are relatively spaced apart along the first direction, and the moving contact 2-2u is clamped in the cover plate. Two contact grooves 2-122u are formed between the cover plate 2-110u and the seat plate 2-120u, and 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 disposed in two arc-blocking plate mounting grooves 51u (that is, the arc-blocking plate mounting groove 51u of the upper arc-blocking plate and the arc-blocking plate mounting groove 51u of the lower arc-blocking plate 5-2u). The connecting air passage 55u is disposed on the arc-blocking part corresponding to the arc-blocking plate mounting groove 51u, and one end is used to communicate with the corresponding support inlet 2-121u. Further, the inner port 55-1u of the connecting air passage 55u is disposed on the side wall of the corresponding arc-blocking plate mounting groove 51u and is used to communicate with the corresponding support inlet 2-121u. Furthermore, both the cover plate 2-110u and the seat plate 2-120u are circular plate structures, and the arc-blocking plate mounting groove 51u is a circular groove. The outer diameter of the cover plate 2-110u and the seat plate 2-120u is adapted to the inner diameter of the arc-blocking plate mounting groove 51u. That is, there is a reasonable gap between the circumferential sidewall of the cover plate 2-110u and the seat plate 2-120u and the circumferential sidewall of their respective corresponding arc-blocking plate mounting grooves 51u, so as to ensure the smooth sliding of the cover plate 2-110u and the seat plate 2-120u. During assembly, the two arc-blocking plate mounting grooves 51u will support 2-1u to be basically accurately limited in the working position.

[0049] Furthermore, both the upper and lower arc-blocking plates 5-2u include an arc-blocking plate connecting portion and an arc-blocking portion. The arc-blocking plate connecting portion is connected to two arc-blocking portions respectively. The two arc-blocking portions are arranged opposite to each other and cooperate with the arc-blocking plate connecting portion to form an arc-blocking plate mounting groove 51u. The arc-blocking plate connecting portion is also provided with an arc-blocking portion shaft hole 54u, which supports the axial ends of 2-1u to be rotatably disposed in the two arc-blocking portion shaft holes 54u respectively. Furthermore, the arc-blocking plate mounting groove 51u is located in a circular groove and is coaxially arranged with the arc-blocking portion shaft hole 54u. Furthermore, the upper arc-blocking plate is an integral structure; the lower arc-blocking plate 5-2u is an integral structure; the upper and lower arc-blocking plates are preferably symmetrical structures.

[0050] Furthermore, the outer edge of each arc-blocking part (i.e., the side edge of the arc-blocking part away from the moving contact mechanism 2u) abuts against the inner edge of the arc-extinguishing baffle of the corresponding arc-extinguishing device (i.e., the side edge of the arc-extinguishing baffle near the moving contact mechanism 2u), and the outer port 55-3u of the connecting air passage 55u is provided on the outer edge of the corresponding arc-blocking part; in the first direction, the thickness of the arc-blocking part is greater than the thickness of the corresponding arc-extinguishing baffle, and the depth of the outer port 55-3u is greater than the thickness of the arc-extinguishing baffle.

[0051] Specifically, such as Figure 3 As shown, each of the aforementioned support inlets 2-121u is disposed 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 disposed on the outer edge of the cover plate 2-110u or the seat plate 2-120u. Further, in the switching unit u of this embodiment, the two support inlets 2-121u are respectively disposed on the radial ends of the seat plate 2-120u, and the two sets of connecting air passages 55u are respectively disposed on the two arc-blocking parts (i.e., the first arc-blocking part 52u and the second arc-blocking part 53u) of the lower arc-blocking plate 5-2u. Alternatively, the two sets of connecting air passages 55u can be respectively set on the two arc-blocking parts of the upper arc-blocking plate, and the two supporting inlets 2-121u can be set on the cover plate 2-110u supporting 2-1u; or, each arc-blocking part of the upper arc-blocking plate and the lower arc-blocking plate is provided with connecting air passages 55u, and the cover plate 2-110u supporting 2-1 and the seat plate 2-120u are also provided with supporting inlets 2-121u.

[0052] As another embodiment of the connecting air passage 55u, the connecting air passage 55u is a pipe structure installed in the corresponding arc-blocking part, that is, the connecting air passage 55u is a closed structure except for the openings at both ends.

[0053] In another embodiment of the connecting air passage 55u, the connecting air passage 55u is disposed on the bottom wall of the unit housing 1u.

[0054] It should be noted that in the description of this invention, 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 conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0055] 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 scope of protection of the present invention.

Claims

1. A switching unit, comprising a unit housing (1u) and a moving contact mechanism (2u), a stationary contact, an arc-extinguishing device, and an arc-blocking plate respectively disposed within the unit housing (1u); the moving contact mechanism (2u) includes a rotatably disposed support (2-1u) and moving contacts (2-2u) disposed on the support (2-1u), the rotation axis of the support (2-1u) being a first direction, the moving contacts (2-2u) including moving contact portions, two sets of moving contact portions respectively cooperating with the stationary contact portions of two sets of stationary contacts to form two sets of contact pairs, the support (2-1) including contact grooves (2-122u), the two sets of contact grooves (2-122u) respectively cooperating with the two sets of contact pairs. The two sets of arc-blocking plates are arranged at intervals along the first direction and form two sets of arc passages arranged on the radial sides of the support (2-1u). The two sets of arc-extinguishing devices are arranged on both sides of the two sets of arc passages along the radial side of the support (2-1u). One end of each arc passage is connected to the corresponding contact groove (2-122u) and the other end is connected to the arc inlet of the corresponding arc-extinguishing device. Its features are: The switching unit also includes connecting air channels (55u) arranged parallel to and spaced apart from the arc passage along the first direction. When the moving contact structure (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 set of connecting air channels (55u).

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

3. The switching unit according to claim 1, characterized in that: When the moving contact mechanism (2u) is in the disconnected position, in the rotation direction of the moving contact mechanism (2u), each end of the contact groove (2-122u) respectively accommodates the moving contact part and the stationary contact part of the corresponding contact pair, and the end of the connecting air passage (55u) connected to the contact groove (2-122u) is located between the moving contact part and the stationary contact part in the contact groove (2-122u).

4. The switching unit according to claim 3, characterized in that: Each of the contact grooves (2-122u) is connected to the arc inlet of the corresponding arc extinguishing device through a set of connecting air passages (55u), and the end of the connecting air passage (55u) connected to the arc inlet of the arc extinguishing device is located close to the corresponding static contact part.

5. The switching unit according to claim 1, characterized in that: The connecting air passage (55u) and the corresponding arc passage are located on both sides of the corresponding arc-blocking plate.

6. The switching unit according to claim 1, characterized in that: The two sets of arc-blocking plates are an upper arc-blocking plate and a lower arc-blocking plate (5-2u), each including two arc-blocking parts arranged on the radial sides of the support (2-1u), namely a first arc-blocking part (52u) and a second arc-blocking part (53u). The two first arc-blocking parts (52u) are opposite to each other along the first direction and form an arc passage between them. The two second arc-blocking parts (53) are opposite to each other along the first direction and form another arc passage between them. The two bottom walls of the unit shell (1u) are arranged at intervals along the first direction, namely an upper bottom wall and a lower bottom wall. The moving contact mechanism (2u), two sets of stationary contacts, two sets of arc-blocking plates and two sets of arc-extinguishing devices are all located between the upper bottom wall and the lower bottom wall. The two arc-blocking parts of the upper arc-blocking plate are stacked together with the upper bottom wall along the first direction, and the two arc-blocking parts of the lower arc-blocking plate (5-2u) are stacked together with the lower bottom wall along the first direction.

7. The switching unit according to claim 6, characterized in that: The connecting air passage (55u) is provided on the arc-blocking part. Each connecting air passage (55u) includes an outer port (55-3u), a channel groove (55-2u) and an inner port (55-1u) that are provided on the corresponding arc-blocking part and connected in sequence. The outer port (55-3u) is in relative communication with the arc inlet of the corresponding arc-extinguishing device, and the inner port (55-1u) is in relative communication with the corresponding contact groove (2-122u). The channel groove (55-2u) is provided on the bottom wall side of the corresponding arc-blocking part facing the corresponding unit shell (1).

8. The switching unit according to claim 6, characterized in that: The side wall of the contact groove (2-122u) is provided with a support inlet (2-121u) that is connected to the corresponding connecting air passage (55u). The two sets of support inlets (2-121u) are respectively located at the radial ends of the support (2-1u) and are connected to the two sets of arc extinguishing devices through the connecting air passage (55u).

9. The switching unit according to claim 8, characterized in that: Both the upper and lower arc-blocking plates (5-2u) are provided with arc-blocking plate mounting grooves (51u), and each arc-blocking plate mounting groove (51u) is formed between two corresponding arc-blocking parts; the support (2-1u) includes a cover plate (2-110u) and a seat plate (2-120u) arranged relatively spaced along a first direction, and a moving contact (2-2u) is sandwiched 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-blocking plate mounting grooves (51u); the connecting air passage (55u) is provided on the arc-blocking part corresponding to the arc-blocking plate mounting groove (51u), and one end is used to communicate with the corresponding support inlet (2-121u).

10. The switching unit according to claim 9, characterized in that: The upper arc-blocking plate is a one-piece structure; and / or, the lower arc-blocking plate (5-2u) is a one-piece structure; 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 set of connecting air passages (55u). The two sets of connecting air passages (55u) are mutually symmetrical about the rotation axis of the moving contact mechanism (2u). In the first direction, the height of each contact groove (2-122u) is less than or equal to 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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