A switching unit, disconnector and power supply system

Abstract

The application discloses a switch unit, an isolating switch and a power supply system, and relates to the technical field of electrical components. The switch unit comprises a shell, a moving contact support, a moving contact and a static contact which cooperate with each other, the moving contact is rotationally arranged in the shell through the moving contact support, the static contact is fixed in the shell, an arc extinguishing area is divided in the shell, the arc extinguishing area extends from a closing position to an opening position, a first air channel and a second air channel are arranged in the shell, an air channel inlet of the first air channel is communicated with the arc extinguishing area and is located at a side wall of the arc extinguishing area close to the closing position, an air channel inlet of the second air channel is communicated with the arc extinguishing area and is located at a side wall of the arc extinguishing area close to the opening position, and an air channel outlet of the first air channel and an air channel outlet of the second air channel are located on an arc spraying side wall of the shell. The switch unit provided by the application has good arc extinguishing performance by arranging the first air channel and the second air channel, and the speed of arc roots entering the arc extinguishing area is accelerated.

Description

Technical Field

[0001] This invention relates to the field of electrical component technology, and more specifically, to a switching unit, a disconnecting switch, and a power supply system. Background Technology

[0002] Disconnecting switches, as an essential electrical component in control circuits, play a role in control and protection in power systems and are widely used in many production processes and technical equipment. A disconnecting switch comprises multiple stacked switching units. The housing of each switching unit contains an arcing space that communicates with the outside. The electric arc generated when the moving and stationary contacts open exits the housing through this arcing space.

[0003] Existing switching units typically have multiple permanent magnets arranged sequentially on the outside of the arc extinguishing space of the housing to guide the arc into the arc extinguishing space and move within it. However, permanent magnet arc extinguishing technology can often only be applied to low-voltage, low-current disconnecting switches. For high-voltage, high-current disconnecting switches, grid arc extinguishing technology is required. The grid will generate resistance to the arc, and existing conventional air passage designs make it difficult to quickly introduce the arc roots at both ends of the arc into the arc extinguishing area, thus preventing the advantages of grid arc extinguishing from being fully utilized. Summary of the Invention

[0004] The purpose of this invention is to provide a switching unit, a disconnecting switch, and a power supply system that can introduce the arc root at the closed and open positions into the arc extinguishing area, thus having good arc extinguishing performance.

[0005] The embodiments of the present invention are implemented as follows:

[0006] A switching unit includes a housing, a moving contact bracket, and a moving contact and a stationary contact that cooperate with each other. The moving contact is rotatably mounted inside the housing via the moving contact bracket, and the stationary contact is fixed inside the housing. The housing is divided into an arc-extinguishing region that extends from the closed position to the open position. The housing is provided with a first air passage and a second air passage. The air passage inlet of the first air passage is connected to the arc-extinguishing region and is located on the side wall of the arc-extinguishing region near the closed position. The air passage inlet of the second air passage is connected to the arc-extinguishing region and is located on the side wall of the arc-extinguishing region near the open position. The air passage outlets of the first air passage and the second air passage are located on the arc-extinguishing side wall of the housing.

[0007] Optionally, the first and second air passages converge within the arc-extinguishing region and extend to the jet arc sidewall, with the air passage outlet of the second air passage reusing the air passage outlet of the first air passage.

[0008] Optionally, a Tesla valve is provided on the side wall of the first airway and / or the second airway near the confluence location. The Tesla valve is used to drive the electric arc in the first airway and / or the second airway to move from the airway inlet to the airway outlet.

[0009] Optionally, the sidewalls of the first and / or second air passages near the air passage inlet are provided with arc-shaped protrusions, which are used to allow arc particles and / or fluid leaving the arc extinguishing area to enter the first or second air passage.

[0010] Optionally, the inlet cross-sectional area of ​​the first airway is larger than the outlet cross-sectional area of ​​the first airway, and the inlet cross-sectional area of ​​the second airway is larger than the outlet cross-sectional area of ​​the second airway.

[0011] Optionally, the Tesla valve includes multiple Tesla valves, which are distributed sequentially and at intervals from the converging position to the airway inlet of the first airway or the second airway, and are staggered on two opposite side walls of the first airway or the second airway.

[0012] Optionally, an arc-extinguishing chamber is provided within the arc-extinguishing area. The inlet of the arc-extinguishing chamber extends from the closed position to the open position, and the outlet of the arc-extinguishing chamber is connected to the inlet of the first and second air passages.

[0013] Optionally, the closed and open positions are also equipped with arc-inducing plates. The arc-inducing plate located in the closed position extends towards the air inlet of the first air passage, and the arc-inducing plate located in the open position extends towards the air inlet of the second air passage.

[0014] Optionally, there are two moving contacts and two stationary contacts. The two stationary contacts are symmetrically arranged with respect to the rotation axis of the moving contact support and cooperate with the two moving contacts respectively. The arc extinguishing area includes a first arc extinguishing area and a second arc extinguishing area. The first arc extinguishing area corresponds to one set of moving contacts and stationary contacts, and the second arc extinguishing area corresponds to another set of moving contacts and stationary contacts.

[0015] Optionally, the distance between the outlet of the first air passage connected to the first arc-extinguishing region and the first side of the arc-spraying sidewall is equal to the distance between the outlet of the first air passage connected to the second arc-extinguishing region and the first side of the arc-spraying sidewall. The distance between the outlet of the second air passage connected to the first arc-extinguishing region and the first side of the arc-spraying sidewall is equal to the distance between the outlet of the second air passage connected to the second arc-extinguishing region and the first side of the arc-spraying sidewall. The outlets of the first and second air passages are both located on the side of the centerline of the arc-spraying sidewall, and the first side is parallel to the rotation axis of the moving contact support.

[0016] Optionally, the first air passage communicating with the first arc-extinguishing region and the first air passage communicating with the fluid in the second arc-extinguishing region are symmetrically arranged with respect to the rotation axis of the moving contact support, and the second air passage communicating with the first arc-extinguishing region and the second air passage communicating with the fluid in the second arc-extinguishing region are symmetrically arranged with respect to the rotation axis of the moving contact support.

[0017] Optionally, the air outlets of the first airway and the second airway are both located on the centerline of the jet arc sidewall.

[0018] Optionally, the arc-spraying sidewall has a first side and a second side parallel to the rotation axis of the moving contact support. The distance between the outlet of the first air passage and the second air passage connected to the first arc-extinguishing region and the first side is greater than the distance between the outlet of the first air passage and the second air passage connected to the first arc-extinguishing region and the second side.

[0019] Optionally, the arc-spraying sidewall has a first side and a second side parallel to the rotation axis of the moving contact support. The distance between the outlet of the first air passage and the second air passage connected to the first arc-extinguishing region and the first side is smaller than the distance between the outlet of the first air passage and the second air passage connected to the first arc-extinguishing region and the second side.

[0020] A disconnect switch includes a handle, an operating mechanism, and multiple stacked switch units as described above. The handle is driven to the operating mechanism, and the operating mechanism is driven to the moving contact in each layer of switch units.

[0021] Optionally, the bottom of the housing of the switch unit is provided with a first protrusion and a second protrusion, which extend into the first air passage and the second air passage of another housing adjacent to the housing, respectively, to seal the top of the first air passage and the second air passage in the other housing.

[0022] The beneficial effects of the embodiments of the present invention include:

[0023] The switching unit provided by this invention includes a housing, a moving contact support, and cooperating moving and stationary contacts. The moving contact is rotatably mounted inside the housing via the moving contact support, while the stationary contact is fixed inside the housing. The housing is divided into an arc-extinguishing region extending from the closed position to the open position. The housing contains a first air passage and a second air passage. The inlet of the first air passage communicates with the arc-extinguishing region and is located on the side wall of the arc-extinguishing region near the closed position. The inlet of the second air passage also communicates with the arc-extinguishing region and is located on the side wall of the arc-extinguishing region near the open position. The outlets of the first and second air passages are located on the arc-extinguishing side wall of the housing. This switching unit, by providing the first and second air passages at positions corresponding to the closed and open positions outside the arc-extinguishing region, increases the air blowing effect of the arc-extinguishing inlet at the closed and open positions, accelerating the speed at which the arc root enters the arc-extinguishing region, thus exhibiting better arc-extinguishing performance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is one of the structural schematic diagrams of the switching unit provided in the embodiments of the present invention;

[0026] Figure 2 This is a second schematic diagram of the structure of the switching unit provided in an embodiment of the present invention;

[0027] Figure 3 for Figure 1 A magnified view of a portion of point A in the middle;

[0028] Figure 4 for Figure 1 A magnified view of a portion of point B in the middle;

[0029] Figure 5 This is one of the structural schematic diagrams of the housing in the switching unit provided in the embodiments of the present invention;

[0030] Figure 6 This is the third schematic diagram of the structure of the switching unit provided in the embodiment of the present invention;

[0031] Figure 7 This is the fourth schematic diagram of the structure of the switching unit provided in the embodiment of the present invention;

[0032] Figure 8 This is the fifth schematic diagram of the structure of the switching unit provided in the embodiment of the present invention;

[0033] Figure 9 This is the sixth schematic diagram of the structure of the switching unit provided in the embodiment of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of the disconnecting switch provided in an embodiment of the present invention;

[0035] Figure 11 This is the second schematic diagram of the housing structure in the switching unit provided in the embodiment of the present invention.

[0036] Icons: 100-Switch unit; 110-Housing; 1112-First arc-extinguishing area; 1113-Second arc-extinguishing area; 112-Closed position; 113-Open position; 114-First air passage; 1141-Air passage outlet; 115-Second air passage; 116-Arc-spraying sidewall; 1161-First side; 1162-Second side; 117-Converging position; 118-First boss; 119-Second boss; 120-Stationary contact; 130-Tesla valve; 140-Arc-shaped protrusion; 150-Grid plate; 160-Arc-initiating plate; 170-Arc-extinguishing chamber; 180-First fixing plate; 200-Disconnecting switch; 220-Handle; 230-Operating mechanism. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this invention, it should be noted that the terms "center," "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Existing DC disconnect switches often employ permanent magnet arc extinguishing technology. While this technology is simple in structure and has a short arcing time, it offers high arcing energy and a long arcing distance. However, permanent magnet arc extinguishing technology is generally only applicable to low-voltage, low-current disconnect switches. For high-voltage, high-current disconnect switches, grid arc extinguishing can rapidly weaken the arc energy and is more advantageous. However, high-voltage, high-current disconnect switches require a large number of grids, and the resistance to the arc entering the grids is significant. Existing conventional air duct designs struggle to quickly introduce the arc roots at both ends of the arc into the arc extinguishing area, preventing the advantages of grid arc extinguishing from being fully realized. Therefore, this application is hereby submitted.

[0043] Please refer to Figure 1 and Figure 2 This embodiment provides a switching unit 100, including a housing 110, a moving contact bracket, and a moving contact and a stationary contact 120 that cooperate with each other. The moving contact is rotatably disposed in the housing 110 through the moving contact bracket, and the stationary contact 120 is fixed in the housing 110. The housing 110 is divided into an arc-extinguishing area, which extends from the closed position 112 to the open position 113. The housing 110 is provided with a first air passage 114 and a second air passage 115. The air passage inlet of the first air passage 114 is connected to the arc-extinguishing area and is located on the side wall of the arc-extinguishing area near the closed position 112. The air passage inlet of the second air passage 115 is connected to the arc-extinguishing area and is located on the side wall of the arc-extinguishing area near the open position 113. The air passage outlet 1141 of the first air passage 114 and the air passage outlet 1141 of the second air passage 115 are located on the arc-extinguishing side wall 116 of the housing 110.

[0044] The switching unit 100 includes a housing 110, a moving contact bracket, a moving contact, and a stationary contact 120. The stationary contact 120 is fixed inside the housing 110, and the moving contact is rotatably disposed inside the housing 110 via the moving contact bracket to make contact with the stationary contact 120 for closing or opening. During the opening process, an electric arc is generated between the moving and stationary contacts 120. To extinguish the arc, an arc-extinguishing area is provided inside the housing 110, extending from the closed position 112 to the open position 113, so that the electric arc generated during the opening process can smoothly enter the arc-extinguishing area. It should be understood that the closed position 112 of the housing 110 is the position of the moving contact when the switching unit 100 is in the closed state; the open position 113 is the position of the moving contact when the switching unit 100 is in the open state.

[0045] To facilitate the introduction of the arc root at the closed position 112 and the open position 113 into the arc-extinguishing zone, the housing 110 is further provided with a first air passage 114 and a second air passage 115. The first air passage 114 guides the arc root at the closed position 112, and the second air passage 115 guides the arc root at the open position 113. Specifically, the first air passage 114 is located beside the side wall of the arc-extinguishing zone near the closed position 112, and the second air passage 115 is located beside the side wall of the arc-extinguishing zone near the open position 113. The air passage inlets of the first air passage 114 and the second air passage 115 are respectively connected to the arc-extinguishing zone, and the air passage outlets 1141 of the first air passage 114 and the second air passage 115 are located on the arc-spraying side wall 116 of the housing 110. The arrangement of the first air passage 114 and the second air passage 115 increases the air blowing effect in the arc-extinguishing zone at the closed position 112 and the open position 113, accelerating the speed at which the arc root enters the arc-extinguishing zone.

[0046] In this embodiment, the positions of the air outlets 1141 of the first air passage 114 and the second air passage 115 on the arc spray sidewall 116 of the housing 110 are not limited, and the air outlets 1141 of the first air passage 114 and the second air passage 115 can be arranged at intervals and are independent of each other; for example Figure 1 As shown, the airway outlet 1141 of the first airway 114 and the second airway 115 can also be the same outlet, that is, the second airway 115 reuses the airway outlet 1141 of the first airway 114.

[0047] The aforementioned switch unit 100 has a first air passage 114 and a second air passage 115 respectively provided at the positions corresponding to the closed position 112 and the open position 113 outside the arc extinguishing area, so as to increase the air blowing effect of the arc extinguishing area at the closed position 112 and the open position 113, accelerate the speed at which the arc root enters the arc extinguishing area, and has better arc extinguishing performance.

[0048] Optionally, in one possible embodiment of the present invention, the first air passage 114 and the second air passage 115 converge in the arc extinguishing region and extend to the arc spraying sidewall 116. The air passage outlet 1141 of the second air passage 115 reuses the air passage outlet 1141 of the first air passage 114 to reduce the number of openings on the arc spraying sidewall 116 of the housing 110, so that the arc particles and / or high-temperature fluid are ejected from the same position on the arc spraying sidewall 116, which facilitates the guidance and collection of the ejected arc particles and / or high-temperature fluid.

[0049] Please refer to Figure 1 and Figure 3 Optionally, in one possible embodiment of the present invention, a Tesla valve 130 is provided on the side wall of the first air passage 114 and / or the second air passage 115 near the converging position 117. The Tesla valve 130 is used to drive the electric arc in the first air passage 114 and / or the second air passage 115 to move from the air passage inlet to the air passage outlet 1141.

[0050] The first air passage 114 and the second air passage 115 converge within the housing 110 and then extend to the arc spray sidewall 116. The first air passage 114 and the second air passage 115 share the same outlet. When arc particles and / or high-temperature fluid move to the converging position 117, the arc particles and / or high-temperature fluid in the first air passage 114 may continue to move towards the air passage outlet 1141 or may backflow into the second air passage 115. Similarly, the arc particles and / or high-temperature fluid in the second air passage 115 may continue to move towards the air passage outlet 1141 or backflow into the first air passage 114. To reduce the backflow of arc particles and / or high-temperature fluid after reaching the converging position 117, a Tesla valve 130 is provided on the sidewall of the first air passage 114 and / or the second air passage 115 near the converging position 117. The Tesla valve 130 has a fixed geometry that allows for unidirectional fluid flow.

[0051] Taking the backflow of arc particles and / or high-temperature fluid from the first airway 114 into the second airway 115 as an example, Figure 3 As indicated by the arrow, the Tesla valve 130 in the second airway 115 guides the backflow of arc particles and / or high-temperature fluid in the second airway 115 toward the airway outlet 1141.

[0052] It should be understood that the Tesla valve 130 can be installed in either the first air passage 114 or the second air passage 115, or it can be installed in both the first air passage 114 and the second air passage 115. The specific selection can be made based on parameters such as the shape and size of the first air passage 114 and the second air passage 115.

[0053] Optionally, in one possible embodiment of the present invention, the Tesla valve 130 includes a plurality of Tesla valves 130, which are distributed sequentially and at intervals from the converging position 117 to the airway inlet of the first airway 114 or the second airway 115, and are staggered on two opposite sidewalls of the first airway 114 or the second airway 115.

[0054] To improve the extraction effect of recoil arc particles and / or high-temperature fluids, multiple Tesla valves 130 can be installed in a single air passage. Taking the installation of multiple Tesla valves 130 in a first air passage 114 as an example, the first air passage 114 has opposing first and second sidewalls perpendicular to the bottom of the housing 110. Multiple Tesla valves 130 are sequentially and alternately arranged on the first and second sidewalls, and are distributed at intervals along the converging point 117 towards the air passage inlet of the first air passage 114. It should be understood that the multiple Tesla valves 130 should guide the arc particles and / or high-temperature fluids in the same direction, i.e., guide the arc particles and / or high-temperature fluids towards the air passage outlet 1141. The arrangement of multiple Tesla valves 130 in the second air passage 115 is the same as in the first air passage 114, and will not be repeated here.

[0055] Please continue to refer to Figure 1 Optionally, in one possible embodiment of the present invention, the inlet cross-sectional area of ​​the first air passage 114 is larger than the outlet cross-sectional area of ​​the first air passage 114, and the inlet cross-sectional area of ​​the second air passage 115 is larger than the outlet cross-sectional area of ​​the second air passage 115, so as to accelerate the movement of arc particles and / or high-temperature fluid to the outlet 1141 and improve the arc extinguishing effect of the switching unit 100.

[0056] Please refer to Figure 1 and Figure 4 Optionally, in one possible embodiment of the present invention, an arc-shaped protrusion 140 is provided on the side wall of the first air passage 114 and / or the second air passage 115 near the air passage inlet. The arc-shaped protrusion 140 is used to allow arc particles and / or fluid leaving the arc extinguishing area to smoothly enter the first air passage 114 or the second air passage 115.

[0057] Turbulence easily forms at the inlets of the first air passage 114 and the second air passage 115. The arc-shaped protrusion 140 can reduce the generation of turbulence and accelerate the entry of the electric arc into the first air passage 114 or the second air passage 115. It should be understood that the arc-shaped protrusion 140 can be provided only in the first air passage 114 or the second air passage 115, or it can be provided in both the first air passage 114 and the second air passage 115. The specific selection can be made according to the shape, size, and other parameters of the first air passage 114 and the second air passage 115.

[0058] Please refer to Figure 1 and Figure 2 Optionally, in one possible embodiment of the present invention, an arc-extinguishing chamber 170 is provided within the arc-extinguishing area. The inlet of the arc-extinguishing chamber 170 extends from the closed position 112 to the open position 113, and the outlet of the arc-extinguishing chamber 170 is connected to the inlets of the first air passage 114 and the second air passage 115. The electric arc entering the arc-extinguishing area will be extinguished within the arc-extinguishing chamber 170, and the remaining arc particles and / or high-temperature fluid will exit the casing via the first air passage 114 or the second air passage 115.

[0059] Optionally, in one possible embodiment of the present invention, the arc-extinguishing chamber 170 includes a first fixing plate 180 and a second fixing plate disposed opposite to each other, and a plurality of spaced grid plates 150 disposed between the first fixing plate 180 and the second fixing plate, the plurality of grid plates 150 extending from the entrance of the arc-extinguishing region into the interior of the arc-extinguishing region.

[0060] The first fixing plate 180 and the second fixing plate are parallel to the bottom surface of the housing 110. Multiple grid plates 150 are clamped and fixed between the first fixing plate 180 and the second fixing plate. The multiple grid plates 150 are spaced apart, with one end of each grid plate 150 facing the entrance to the arc-extinguishing area and the other end facing either the first air passage 114 or the second air passage 115. During the opening process, the electric arc first enters the area where the grid plate 150 is located and is divided into multiple arc segments. The arc particles and / or high-temperature fluid generated by the arc combustion are then diverted to the first air passage 114 and the second air passage 115. Adjacent grid plates 150 are spaced apart so that the air passage entrances of the first air passage 114 and the second air passage 115 communicate with the arc-extinguishing area through the gap between adjacent grid plates 110. The first air passage 114 and the second air passage 115, in conjunction with the grid plates 150, improve the arc-extinguishing effect of the switching unit 100.

[0061] It should be understood that the extension paths of the multiple grid plates 150 can be parallel to each other or have a preset angle. The lengths of the multiple grid plates 150 can be the same or different. Those skilled in the art can make reasonable designs according to the shape of the arc extinguishing region.

[0062] Optionally, in one possible embodiment of the present invention, the closed position 112 and the open position 113 are respectively provided with arc-inducing plates 160. The arc-inducing plate 160 located at the closed position 112 extends towards the air inlet of the first air passage 114, and the arc-inducing plate 160 located at the open position 113 extends towards the air inlet of the second air passage 115. The arc-inducing plate 160 cooperates with the first air passage 114 and the second air passage 115 to guide the arc root at the closed position 112 and the open position 113 to accelerate into the arc-extinguishing region.

[0063] For example, in the closed position 112, the portion of the arc-starting piece 160 outside the arc-extinguishing area is in contact with the stationary contact 120, while the portion within the arc-extinguishing area extends along the side of the arc-extinguishing chamber 170 to the air inlet of the first air passage 114. In the open position 113, the portion of the arc-starting piece 160 outside the arc-extinguishing area extends along the inner wall of the housing 110, while the portion within the arc-extinguishing area extends along the side of the arc-extinguishing chamber 170 to the air inlet of the second air passage 115. Optionally, the arc-starting piece 160 comprises multiple segments connected in sequence, with at least one segment extending towards the air inlet of either the first air passage 114 or the second air passage 115.

[0064] Please refer to Figure 1Optionally, in one possible embodiment of the present invention, both the moving contact and the stationary contact 120 include two, the two stationary contacts 120 are symmetrically arranged with respect to the rotation axis of the moving contact support, and cooperate with the two moving contacts respectively. The arc extinguishing region includes a first arc extinguishing region 1112 and a second arc extinguishing region 1113. The first arc extinguishing region 1112 corresponds to one set of moving contacts and stationary contacts 120, and the second arc extinguishing region 1113 corresponds to another set of moving contacts and stationary contacts 120.

[0065] In this embodiment, there are two sets of moving contacts and stationary contacts 120, with each moving contact simultaneously contacting or separating from the other two stationary contacts 120. A first arc-extinguishing region 1112 and a second arc-extinguishing region 1113 are respectively provided along the opening and closing paths of the two sets of moving contacts and stationary contacts 120 to extinguish the arc generated during opening.

[0066] It should be understood that the shell 110 has a first air passage 114 and a second air passage 115 on both sides, which are connected to the first arc extinguishing region 1112 and the second arc extinguishing region 1113, respectively. At this time, the shell 110 has two opposing arc-spraying sidewalls 116. The air passage outlets 1141 of the first air passage 114 and the second air passage 115 connected to the first arc extinguishing region 1112 are located on one arc-spraying sidewall 116, and the air passage outlets 1141 of the first air passage 114 and the second air passage 115 connected to the second arc extinguishing region 1113 are located on the other arc-spraying sidewall 116.

[0067] For example, please refer to the reference. Figure 5 The first air passage 114 and the second air passage 115, which are connected to the same arc-extinguishing area, share the same outlet. The air passage outlets 1141 on the two arc-extinguishing sidewalls 116 are at the same height, and the top of the air passage outlets 1141 extends to the upper edge of the housing 110. That is, the distance between the bottom and the top of the air passage outlet 1141 on one arc-extinguishing sidewall 116 is H1, and the distance between the bottom and the top of the air passage outlet 1141 on the other arc-extinguishing sidewall 116 is H2, where H1 = H2.

[0068] Please refer to Figure 6Optionally, in one possible embodiment of the present invention, the distance D1 between the air outlet 1141 of the first air passage 114 communicating with the first arc-extinguishing region 1112 and the first side 1161 of the arc-spraying sidewall 116 where it is located is equal to the distance D2 between the air outlet 1141 of the first air passage 114 communicating with the second arc-extinguishing region 1113 and the first side 1161 of the arc-spraying sidewall 116 where it is located, and the distance D1 between the second air passage 115 communicating with the first arc-extinguishing region 1112 and the second air passage 115 communicating with the first arc-extinguishing region 1112 is equal to the distance D2 between the air outlet 1141 of the first air passage 114 communicating with the second arc-extinguishing region 1113 and the second air passage 115 communicating with the first arc-extinguishing region 1112 is equal to the distance D2 between the air outlet 1141 of the first air passage 114 communicating with the second arc-extinguishing region 1113 and the second air passage 115 communicating with the first arc-extinguishing region 1112 is equal to the distance D2 between the air outlet 1141 of the first air passage 114 communicating with the second arc-spraying sidewall 114 ... The distance between the air outlet 1141 and the first side 1161 of the arc-spraying sidewall 116 is equal to the distance between the air outlet 1141 of the second airway 115, which is connected to the second arc-extinguishing region 1113, and the first side 1161 of the arc-spraying sidewall 116. The air outlet 1141 of the first airway 114 and the air outlet 1141 of the second airway 115 are both located on the side of the centerline of the arc-spraying sidewall 116. The first side 1161 is parallel to the rotation axis of the moving contact bracket.

[0069] In this embodiment, the first air passage 114 communicating with the first arc-extinguishing region 1112 and the first air passage 114 communicating with the second arc-extinguishing region 1113 are asymmetrical, as are the second air passages 115 communicating with the first arc-extinguishing region 1112 and the second air passage 115 communicating with the second arc-extinguishing region 1113. However, the air passage outlets 1141 of the two first air passages 114 and the air passage outlets 1141 of the two second air passages 115 are respectively located on a straight line perpendicular to the arc-spraying sidewall 116, and this straight line does not pass through the centerline of the arc-spraying sidewall 116. This layout scheme facilitates the customer's design to avoid the air passage outlets 1141 when the disconnect switch 200 is installed in the customer's system, and also facilitates the installation and fixation of the disconnect switch 200 by means of side rails.

[0070] It should be noted that the centerline of the arc spraying sidewall 116 is the line connecting the midpoints of the upper and lower sides of the arc spraying sidewall 116, and the centerline of the arc spraying sidewall 116 is parallel to the rotation axis of the moving contact bracket.

[0071] Figure 6 The embodiment shown is one in which the second air passage 115 reuses the air passage outlet 1141 of the first air passage 114. In some other embodiments, when the second air passage 115 does not reuse the air passage outlet 1141 of the first air passage 114, the two first air passages 114 are located on a straight line perpendicular to the jet arc sidewall 116, and the two second air passages 115 are located on another straight line perpendicular to the jet arc sidewall 116.

[0072] Please refer to Figure 7Optionally, in one possible embodiment of the present invention, the first air passage 114 communicating with the first arc-extinguishing region 1112 and the first air passage 114 communicating with the second arc-extinguishing region 1113 are symmetrically arranged with respect to the rotation axis of the moving contact support, and the second air passage 115 communicating with the first arc-extinguishing region 1112 and the second air passage 115 communicating with the second arc-extinguishing region 1113 are symmetrically arranged with respect to the rotation axis of the moving contact support.

[0073] In this embodiment, the two first air passages 114 and the two second air passages 115 are symmetrically distributed with respect to the rotation axis of the moving contact support. Therefore, the air passage outlets 1141 of the two first air passages 114 and the air passage outlets 1141 of the two second air passages 115 are also symmetrically distributed with respect to the rotation axis of the moving contact support. This layout scheme can ensure that the arc-extinguishing performance of the first arc-extinguishing region 1112 and the second arc-extinguishing region 1113 remains consistent.

[0074] Figure 7 The embodiment shown is an example where the second airway 115 reuses the airway outlet 1141 of the first airway 114. In some other embodiments, when the second airway 115 does not reuse the airway outlet 1141 of the first airway 114, the two first airways 114 are located on a straight line with an acute angle between the rotation center of an overmoving contact support and the arc spray sidewall 116, and the two second airways 115 are located on a straight line with an acute angle between the rotation center of another overmoving contact support and the arc spray sidewall 116.

[0075] Optionally, in one possible embodiment of the present invention, the air outlet 1141 of the first airway 114 and the air outlet 1141 of the second airway 115 are both located on the centerline of the jet arc sidewall 116.

[0076] In this embodiment, the air outlets 1141 of the two first air passages 114 and the air outlets 1141 of the two second air passages 115 are respectively located on a straight line perpendicular to the spray arc sidewall 116, and this straight line passes through the centerline of the spray arc sidewall 116. That is, the distance D3 between the air outlet 1141 of the first air passage 114 and the first side 1161 of the spray arc sidewall 116 is equal to the distance D4 between the air outlet 1141 of the first air passage 114 and the second side 1162 of the spray arc sidewall 116; the distance between the air outlet 1141 of the second air passage 115 and the first side 1161 of the spray arc sidewall 116 is equal to the distance between the air outlet 1141 of the second air passage 115 and the second side 1162 of the spray arc sidewall 116. Preferably, the second air passage 115 reuses the air passage outlet 1141 of the first air passage 114 to save the dimensions of the housing 110 in the height direction and increase the cross-sectional area of ​​the air passage outlet 1141.

[0077] Please refer to Figure 8Optionally, in one possible embodiment of the present invention, the arc-spraying sidewall 116 has a first side 1161 and a second side 1162 parallel to the rotation axis of the moving contact support. The distance between the air outlet of the first air passage 114 and the second air passage 115 communicating with the first arc-extinguishing region 1112 and the first side 1161 is greater than the distance between the air outlet of the first air passage 114 and the second air passage 115 communicating with the first arc-extinguishing region 1112 and the second side 1162.

[0078] That is, the distance between the air outlet of the first airway 114, which is connected to the first arc-extinguishing region 1112, and the first side 1161 is greater than the distance between the air outlet and the second side 1162; the distance between the air outlet of the second airway 115, which is connected to the first arc-extinguishing region 1112, and the first side 1161 is greater than the distance between the air outlet and the second side 1162.

[0079] Since the air outlets 1141 on the two arc-extinguishing sidewalls 116 are symmetrically distributed with respect to the rotation axis of the moving contact support, the distances between the air outlets of the first airway 114 and the second airway 115, which are connected to the second arc-extinguishing region 1113, and the first side 1161 are respectively smaller than the distances between the air outlets of the first airway 114 and the second airway 115, which are connected to the second arc-extinguishing region 1113, and the second side 1162.

[0080] Please refer to Figure 9 Optionally, in one possible embodiment of the present invention, the arc-spraying sidewall 116 has a first side 1161 and a second side 1162 parallel to the rotation axis of the moving contact support. The distance between the air outlet of the first air passage 114 and the second air passage 115 communicating with the first arc-extinguishing region 1112 and the first side 1161 is smaller than the distance between the air outlet of the first air passage 114 and the second air passage 115 communicating with the first arc-extinguishing region 1112 and the second side 1162.

[0081] That is, the distance between the air outlet of the first airway 114, which is connected to the first arc-extinguishing region 1112, and the first side 1161 is less than the distance between the airway outlet and the second side 1162; the distance between the air outlet of the second airway 115, which is connected to the first arc-extinguishing region 1112, and the first side 1161 is less than the distance between the airway outlet and the second side 1162.

[0082] Since the air outlets 1141 on the two arc-extinguishing sidewalls 116 are symmetrically distributed with respect to the rotation axis of the moving contact support, the distances between the air outlets of the first airway 114 and the second airway 115, which are connected to the second arc-extinguishing region 1113, and the first side 1161 are respectively greater than the distances between the air outlets of the first airway 114 and the second airway 115, which are connected to the second arc-extinguishing region 1113, and the second side 1162.

[0083] Please refer to Figure 10 This embodiment also provides a disconnecting switch 200, including a handle 220, an operating mechanism 230, and multiple stacked switch units 100 as described above. The handle 220 is driven to the operating mechanism 230, and the operating mechanism 230 is driven to the moving contact in each layer of switch unit 100. Thus, the handle 220 controls the operating mechanism 230 to perform closing and opening operations on each layer of switch unit 100.

[0084] The disconnector switch 200 has the same structure and beneficial effects as the switch unit 100 in the foregoing embodiments. The structure and beneficial effects of the switch unit 100 have been described in detail in the foregoing embodiments and will not be repeated here.

[0085] Please refer to the reference. Figure 1 and Figure 11 Optionally, in one possible embodiment of the present invention, the bottom of the housing 110 of the switch unit 100 is provided with a first protrusion 118 and a second protrusion 119. The first protrusion 118 and the second protrusion 119 extend into the first air passage 114 and the second air passage 115 of another housing 110 adjacent to the housing 110, so as to seal the top of the first air passage 114 and the second air passage 115 in the other housing 110.

[0086] In the disconnector switch 200, multiple switch units 100 are stacked together via a housing 110. The bottom of the housing 110 has a first protrusion 118 and a second protrusion 119. The cross-sectional shape and dimensions of the first protrusion 118 are the same as those of the first air passage 114, but its thickness is less than that of the first air passage 114. Its position corresponds to the position of the first air passage 114 along the height direction of the housing 110. The cross-sectional shape and dimensions of the second protrusion 119 are the same as those of the second air passage 115, but its thickness is less than that of the second air passage 115. Its position corresponds to the position of the second air passage 115 along the height direction of the housing 110. When two adjacent housing layers 110 are stacked, the first protrusion 118 extends into the first air passage 114, and the second protrusion 119 extends into the second air passage 115, sealing the tops of the first and second air passages 114 and 115, so that the electric arc can only be ejected from the air passage outlets 1141 of the first and second air passages 114 and 115.

[0087] This embodiment also provides a power supply system, including a DC source, a power conversion device, and the aforementioned disconnect switch 200. The disconnect switch 200 is connected between the DC source and the power conversion device, and is used to trip the power supply system. In the event of a fault in the DC source and / or the power conversion unit, the power supply system can be tripped by operating the disconnect switch 200.

[0088] This power supply system also includes the same structure and beneficial effects as the switching unit 100 in the foregoing embodiments. The structure and beneficial effects of the switching unit 100 have been described in detail in the foregoing embodiments and will not be repeated here.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switching unit (100), characterized in that, The device includes a housing (110), a moving contact support, and a moving contact and a stationary contact (120) that cooperate with each other. The moving contact is rotatably mounted inside the housing (110) via the moving contact support, and the stationary contact (120) is fixed inside the housing (110). The housing (110) is divided into an arc-extinguishing area that extends from the closed position (112) to the open position (113). The housing (110) is provided with a first air passage (114) and a second air passage (115). The inlet of the first air passage (114) is connected to the arc extinguishing area and is located on the side wall of the arc extinguishing area near the closed position (112). The inlet of the second air passage (115) is connected to the arc extinguishing area and is located on the side wall of the arc extinguishing area near the open position (113). The outlet of the first air passage (114) and the outlet (1141) of the second air passage (115) are located on the arc-spraying side wall (116) of the housing (110). An arc-extinguishing chamber (170) is provided in the arc-extinguishing area. The inlet of the arc-extinguishing chamber (170) extends from the closed position (112) to the open position (113). The outlet of the arc-extinguishing chamber (170) is connected to the inlet of the first air passage (114) and the second air passage (115). An air-blocking member is provided on the side of the arc-extinguishing chamber (170) away from the moving contact. The extension length of the air-blocking member is less than the extension length of the arc-extinguishing chamber (170). The grid plates at the head and tail of the arc-extinguishing chamber (170) are not blocked by the air-blocking member. The first air passage (114) and the second air passage (115) are located on both sides of the air-blocking member.

2. The switching unit (100) according to claim 1, characterized in that, The first air passage (114) and the second air passage (115) converge in the arc extinguishing area and extend to the arc spray sidewall (116). The air passage outlet (1141) of the second air passage (115) reuses the air passage outlet (1141) of the first air passage (114).

3. The switching unit (100) according to claim 2, characterized in that, The first airway (114) and / or the second airway (115) are provided with a Tesla valve (130) on the side wall near the converging position (117). The Tesla valve (130) is used to drive the electric arc in the first airway (114) and / or the second airway (115) to move from the airway inlet to the airway outlet (1141).

4. The switching unit (100) according to claim 1, characterized in that, The first air passage (114) and / or the second air passage (115) have an arc-shaped protrusion (140) on the side wall near the air passage inlet. The arc-shaped protrusion (140) is used to allow arc particles and / or fluid leaving the arc extinguishing area to enter the first air passage (114) or the second air passage (115).

5. The switching unit (100) according to claim 1, characterized in that, The inlet cross-sectional area of ​​the first airway (114) is larger than the outlet cross-sectional area of ​​the first airway (1141), and the inlet cross-sectional area of ​​the second airway (115) is larger than the outlet cross-sectional area of ​​the second airway (115) (1141).

6. The switching unit (100) according to claim 3, characterized in that, The Tesla valve (130) includes a plurality of Tesla valves (130), which are distributed sequentially and at intervals from the converging position (117) to the airway inlet of the first airway (114) or the second airway (115), and are staggered on two opposite sidewalls of the first airway (114) or the second airway (115).

7. The switching unit (100) according to claim 1, characterized in that, The closed position (112) and the open position (113) are also provided with arc-drawing plates (160). The arc-drawing plate (160) located at the closed position (112) extends to the air inlet of the first air passage (114), and the arc-drawing plate (160) located at the open position (113) extends to the air inlet of the second air passage (115).

8. The switching unit (100) according to any one of claims 1 to 7, characterized in that, Both the moving contact and the stationary contact (120) include two. The two stationary contacts (120) are symmetrically arranged with respect to the rotation axis of the moving contact support and cooperate with the two moving contacts respectively. The arc extinguishing area includes a first arc extinguishing area (1112) and a second arc extinguishing area (1113). The first arc extinguishing area (1112) corresponds to one set of the moving contact and the stationary contact (120), and the second arc extinguishing area (1113) corresponds to another set of the moving contact and the stationary contact (120).

9. The switching unit (100) according to claim 8, characterized in that, The distance between the outlet (1141) of the first air passage (114) connected to the first arc-extinguishing region and the first side (1161) of the arc-spraying sidewall (116) where it is located is equal to the distance between the outlet (1141) of the first air passage (114) connected to the second arc-extinguishing region (1113) and the first side (1161) of the arc-spraying sidewall (116) where it is located. The distance between the first side (1161) of 16) is equal to the distance between the air outlet (1141) of the second air passage (115) connected to the second arc extinguishing area (1113) and the first side (1161) of the arc spraying sidewall (116) where it is located. The air outlet (1141) of the first air passage (114) and the air outlet (1141) of the second air passage (115) are both located on the side of the center line of the arc spraying sidewall (116). The first side (1161) is parallel to the rotation axis of the moving contact bracket.

10. The switching unit (100) according to claim 8, characterized in that, The first air passage (114) communicating with the first arc-extinguishing region (1112) and the second air passage (114) communicating with the second arc-extinguishing region (1113) are symmetrically arranged with respect to the rotation axis of the moving contact support. The second air passage (115) communicating with the first arc-extinguishing region (1112) and the second air passage (115) communicating with the second arc-extinguishing region (1113) are symmetrically arranged with respect to the rotation axis of the moving contact support.

11. The switching unit (100) according to claim 10, characterized in that, The air outlet (1141) of the first air passage (114) and the air outlet (1141) of the second air passage (115) are both located on the centerline of the jet arc sidewall (116).

12. The switching unit (100) according to claim 10, characterized in that, The arc-spraying sidewall (116) has a first side (1161) and a second side (1162) parallel to the rotation axis of the moving contact bracket. The distance between the outlet of the first air passage (114) and the second air passage (115) connected to the first arc-extinguishing region (1112) and the first side (1161) is greater than the distance between the outlet of the first air passage (114) and the second air passage (115) connected to the first arc-extinguishing region (1112) and the second side (1162).

13. The switching unit (100) according to claim 10, characterized in that, The arc-spraying sidewall (116) has a first side (1161) and a second side (1162) parallel to the rotation axis of the moving contact support. The distance between the outlet of the first air passage (114) and the second air passage (115) connected to the first arc-extinguishing region (1112) and the first side (1161) is smaller than the distance between the outlet of the first air passage (114) and the second air passage (115) connected to the first arc-extinguishing region (1112) and the second side (1162).

14. A disconnecting switch (200), characterized in that, The switch includes a handle (220), an operating mechanism (230), and a plurality of stacked switch units (100) as described in any one of claims 1 to 13, wherein the handle (220) is driven to the operating mechanism (230), and the operating mechanism (230) is driven to the moving contact support in each layer of the switch unit (100).

15. The disconnector (200) according to claim 14, characterized in that, The bottom of the housing (110) of the switch unit (100) is provided with a first boss (118) and a second boss (119). The first boss (118) and the second boss (119) extend into the first air passage (114) and the second air passage (115) of another housing (110) adjacent to the housing (110) to seal the top of the first air passage (114) and the second air passage (115) in the other housing (110).

16. A power supply system, characterized in that, It includes a DC source, a power conversion device, and a disconnecting switch (200) as described in claim 14 or 15, the disconnecting switch (200) being connected between the DC source and the power conversion device, and the disconnecting switch (200) being used to disconnect the power supply system.

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