Photovoltaic inverter and disconnector

Abstract

A photovoltaic inverter and an isolating switch. The isolating switch comprises a transmission shaft, an output shaft, and a driving assembly, a plurality of first switch units and a plurality of second switch units which are sequentially stacked. The current-carrying capacity of the first switch units is greater than that of the second switch units. The driving assembly is connected with the output shaft and is used to drive the output shaft to rotate. Each first switch unit comprises a first moving contact, a first stationary contact and a first support structure. The first moving contact is fixed to the first support structure, and the first moving contacts of two adjacent first switch units are fixedly connected through the respective first support structures. The first support structure closest to the driving assembly is connected with the output shaft. The output shaft is used to drive each first moving contact to rotate through the first support structure. The transmission shaft passes through a plurality of second moving contacts and is connected with the first support structure closest to the second switch units. The transmission shaft is used to drive each second moving contact to rotate under the driving of the first support structure closest to the second switch units.

Description

Technical Field

[0001] This application relates to the field of power distribution technology, and in particular to a photovoltaic inverter and a disconnecting switch. Background Technology

[0002] Rotary disconnect switches are widely used in photovoltaic power supply systems. A typical rotary disconnect switch consists of a front-mounted operating mechanism layer and multiple stacked switching units at the rear. The rotating center of the switching unit housing houses a rotating moving contact, surrounded by stationary contacts and arc-extinguishing chambers arranged around the rotating periphery of the moving contact. The arc-extinguishing chambers are used for interruption and arc extinguishing. The operating mechanism layer drives the rotation of the moving contact to engage and disengage with the stationary contact, thereby enabling the switching unit to connect and disconnect. In photovoltaic power supply systems, rotary disconnect switches are core components ensuring the safe operation of the system. Their opening and closing synchronization and high current carrying capacity are particularly important. However, existing rotary disconnect switch designs struggle to simultaneously address both high current carrying capacity and the synchronization of opening and closing among the switching units. Utility Model Content

[0003] This application provides a photovoltaic inverter and disconnecting switch that can carry large currents while achieving better synchronization when each switching unit is opened and closed.

[0004] In a first aspect, this application provides a photovoltaic inverter, which includes an isolating switch and a DC-DC conversion circuit. The isolating switch connects a photovoltaic string and the DC-DC conversion circuit. The isolating switch includes a drive mechanism, multiple first switching units, multiple second switching units, and a drive shaft. The current-carrying capacity of the first switching units is greater than that of the second switching units. The drive mechanism includes a drive assembly and an output shaft. The drive assembly, multiple first switching units, and multiple second switching units are stacked sequentially. The drive assembly is connected to the output shaft and is used to drive the output shaft to rotate. Each first switching unit includes a first moving contact, a first stationary contact, and a first support structure. The first moving contact is fixed to the first support structure. The first moving contacts of two adjacent first switching units are fixedly connected through their respective first support structures. The first support structure of the first switching unit closest to the drive assembly is connected to the output shaft. The output shaft is used to drive each first moving contact to rotate through the first support structure, so that the first moving contact of each first switching unit contacts or separates from the first stationary contact. Each second switching unit includes a second moving contact and a second stationary contact. The drive shaft passes through the second moving contacts of multiple second switching units and is connected to the first support structure closest to the second switching unit. The drive shaft is used to drive each second moving contact to rotate under the drive of the first support structure closest to the second switch unit, so that the second moving contact of each second switch unit contacts or separates from the second stationary contact.

[0005] In the disconnecting switch of this application, the output shaft indirectly drives the first moving contact to rotate through the first support structure closest to the driving component. This eliminates the need for a shaft hole in the first moving contact for the output shaft to pass through, ensuring the integrity of the first moving contact structure. This allows the current-carrying components (first moving contact and first stationary contact) of the first switching unit to remain structurally intact, enabling the first switching unit to carry large currents. In the second switching unit, a drive shaft passes through multiple second moving contacts. Driven by the first support structure closest to the second switching unit, the drive shaft directly drives the second moving contacts to rotate. That is, the operating force transmitted from the first support structure does not decrease layer by layer under the drive of the drive shaft, improving the synchronization of the second switching units. In summary, the disconnecting switch, combining indirect drive of the first moving contact and direct drive of the second moving contact, achieves better synchronization while meeting the requirements of high-current applications.

[0006] In conjunction with the first aspect, in one possible implementation, each first support structure includes a first base and a first top cover interconnected. The first base houses a first moving contact and a portion of a first stationary contact, and the first moving contact is disposed between the first base and the first top cover. In two adjacent first support structures, the first base of one first support structure is connected to the first top cover of the other first support structure. The first top cover closest to the drive assembly along the output shaft axis is mated with the output shaft, and the first base furthest from the drive assembly along the output shaft axis is connected to the transmission shaft.

[0007] The first switching unit closest to the drive component along the output shaft axis is the top-level first switching unit, and the first switching unit furthest from the drive component along the output shaft axis is the bottom-level first switching unit. The remaining first switching units are intermediate-level first switching units. The top cover of the top-level first switching unit rotates its first base under the operating force transmitted from the output shaft. The operating force transmitted from the top-level first base then rotates the top cover and first base of the next layer of first switching units. The intermediate-level first switching units achieve layer-by-layer linkage through the first bases and top covers of adjacent layers. Each first moving contact rotates along with its corresponding first base. The first moving contact does not need to be directly connected to the output shaft, ensuring the structural integrity of the first moving contact of each first switching unit. This guarantees the current-carrying capacity of each first switching unit, thus giving the disconnecting switch a good high-current-carrying capacity.

[0008] In conjunction with the first aspect, in one possible implementation, each first base includes a first substrate, a first movable contact is provided between the first substrate and the first top cover, and the first base furthest from the drive assembly is provided with a first limiting portion, which is located on the side of the first substrate facing the second switching unit and is connected to the end of the drive shaft facing the first switching unit.

[0009] The transmission between the first switching unit and the drive shaft is directly connected through the first limiting part, which is located on the side of the first base plate furthest from the drive component and facing the second switching unit. The drive shaft does not pass through the first moving contact. When the first moving contact and the first base rotate, the operating force can be transmitted to the drive shaft through the first base furthest from the drive component. The drive shaft can drive the second moving contacts of multiple second switching units to rotate. While ensuring the structural integrity of the first moving contact, the operating force transmitted from the first base furthest from the drive component will not be attenuated layer by layer in the second switching unit. The opening and closing synchronism of multiple second switching units is consistent, so that the overall disconnecting switch has good synchronism.

[0010] In conjunction with the first aspect, in one possible implementation, the drive shaft includes a connecting rod and a protrusion. The end of the connecting rod facing the first switching unit is connected to the protrusion, and the connecting rod passes through multiple second switching units. A portion of the protrusion protrudes relative to the connecting rod in a direction perpendicular to the axial direction of the drive shaft, and the protrusion engages with a first limiting portion.

[0011] The protrusions strengthen the connection between the drive shaft and the first limiting part of the bottom first switch unit, thereby effectively improving the transmission reliability between the first switch unit and the second switch unit.

[0012] In conjunction with the first aspect, in one possible implementation, each second switch unit further includes a second top cover. Each second top cover includes a cover plate sleeved on the drive shaft. The cover plate is located on the side of the second moving contact facing the first switch unit and is connected and fixed to the second moving contact. The cover plate closest to the first switch unit has a first limiting protrusion. The first limiting protrusion is located on the side of the cover plate opposite to the second moving contact. The first limiting protrusion is sleeved on the drive shaft, and a first limiting portion engages with the first limiting protrusion.

[0013] By cooperating with the first limiting protrusion and the first limiting part, the limiting between the connected second switch unit and the first switch unit can be realized. At the same time, the first limiting protrusion is sleeved on the outside of the drive shaft, and the drive shaft can be connected with the first limiting part through the cooperation of the first limiting protrusion, which helps to improve the reliability of the connection between the drive shaft and the first limiting part.

[0014] In conjunction with the first aspect, in one possible implementation, each cover plate has a plug-in portion on the side facing the second moving contact, the plug-in portion passes through the second moving contact and is sleeved on the drive shaft, and the plug-in portion is located between the second moving contact and the drive shaft in a direction perpendicular to the axial direction of the drive shaft.

[0015] The insertion part is located on the side of the cover plate facing the second moving contact, and is sleeved on the outside of the drive shaft. The insertion part can limit the portion of the drive shaft located on the side of the cover plate facing the second moving contact, making the drive shaft more reliable during transmission. In addition, in the direction perpendicular to the axial direction of the drive shaft, the insertion part is located between the second moving contact and the drive shaft, and is sleeved on the outside of the drive shaft. The second moving contact is then sleeved on the outside of the insertion part. In this way, the insertion part can also limit and fix the second moving contact, while isolating the drive shaft and the second moving contact, thus providing insulation and protection for the second moving contact and the drive shaft.

[0016] In conjunction with the first aspect, in one possible implementation, the cover plates of the remaining second switch units are provided with second limiting protrusions, which are located on the side of their respective cover plates facing the first switch unit, and the second limiting protrusions are sleeved on the drive shaft; between two adjacent second switch units, the insertion part of one second switch unit is engaged with the second limiting protrusion of the other second switch unit.

[0017] Since both the plug and the second limiting protrusion are sleeved on the drive shaft, in two adjacent second switch units, the plug and the second limiting protrusion are connected and fixed by a nested fit, which can strengthen the connection between two adjacent second top covers.

[0018] In conjunction with the first aspect, in one possible implementation, the cover plate is located between two adjacent second moving contacts along the axial direction of the drive shaft.

[0019] The cover plate is usually made of insulating material. The cover plate can provide insulation protection for two adjacent second moving contacts, reducing the possibility of accidental conduction of the moving contact parts of the two adjacent second switch units.

[0020] In conjunction with the first aspect, in one possible implementation, each cover plate has a second mating portion on the side facing away from the second moving contact. Each second switching unit also includes a second base, which is located on the side of the second moving contact facing away from the cover plate. The second base includes a second base plate and a second limiting portion. The second base plate is sleeved on the insertion portion, and the second moving contact is located between the second base plate and the cover plate. The second limiting portion is located on the side of the second base plate facing away from the second moving contact. In two adjacent second switching units, the second limiting portion of the second switching unit closer to the first switching unit is mated and connected with the second mating portion of the other second switching unit.

[0021] In two adjacent second switch units, the plug portion of the second switch unit closer to the first switch unit passes through the second base of the same second switch unit and connects with the second limiting protrusion of the other second switch unit. In this way, the second top cover of the two adjacent second switch units is interconnected. The second base of the second switch unit closer to the first switch unit and the second top cover of the other second switch unit are limited and fixed by the second limiting part and the second mating part, which makes the connection between the second base and the two adjacent second top covers, as well as the connection between the two adjacent second top covers, more reliable, ensuring reliable interlayer limiting and linkage of each second switch unit.

[0022] Secondly, this application provides a disconnecting switch applied to a photovoltaic inverter. The photovoltaic inverter includes a disconnecting switch and a DC-DC conversion circuit. The disconnecting switch is used to connect the photovoltaic string and the DC-DC conversion circuit. The disconnecting switch includes a drive mechanism, multiple first switching units, multiple second switching units, and a drive shaft. The current-carrying capacity of the first switching units is greater than that of the second switching units. The drive mechanism includes a drive assembly and an output shaft. The drive assembly, multiple first switching units, and multiple second switching units are stacked sequentially. The drive assembly is connected to the output shaft and is used to drive the output shaft to rotate. Each first switching unit includes a first moving contact, a first stationary contact, and a first support structure. The first moving contact is fixed to the first support structure. The first moving contacts of two adjacent first switching units are fixedly connected through their respective first support structures. The first support structure of the first switching unit closest to the drive assembly is connected to the output shaft. The output shaft is used to drive each first moving contact to rotate through the first support structure, so that the first moving contact of each first switching unit contacts or separates from the first stationary contact. Each second switching unit includes a second moving contact and a second stationary contact. The drive shaft passes through the second moving contacts of multiple second switch units and is connected to the first support structure closest to the second switch unit. The drive shaft is used to drive each second moving contact to rotate under the drive of the first support structure closest to the second switch unit, so that the second moving contact of each second switch unit contacts or separates from the second stationary contact. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0024] Figure 1 This application provides a schematic diagram of a photovoltaic power supply system network according to one embodiment.

[0025] Figure 2 This is a simplified structural diagram of a photovoltaic inverter provided in one embodiment of this application;

[0026] Figure 3This is a schematic diagram of the structure of a disconnecting switch provided in an embodiment of this application;

[0027] Figure 4 A cross-sectional structural schematic diagram of a disconnecting switch provided in an embodiment of this application;

[0028] Figure 5 An exploded view of the first switching unit provided in an embodiment of this application;

[0029] Figure 6 An exploded view of the underlying first switch unit and an adjacent first switch unit provided in an embodiment of this application;

[0030] Figure 7 A three-dimensional structural schematic diagram of a transmission shaft provided in an embodiment of this application;

[0031] Figure 8 This is a schematic diagram of the structure of a first base of a bottom-layer first switching unit provided in an embodiment of this application;

[0032] Figure 9 A cross-sectional structural schematic diagram of another disconnecting switch provided in an embodiment of this application;

[0033] Figure 10 A three-dimensional structural schematic diagram of another transmission shaft provided in an embodiment of this application;

[0034] Figure 11 A three-dimensional structural schematic diagram of another first base for a bottom first switching unit provided in an embodiment of this application;

[0035] Figure 12 An exploded view of a top-level second switching unit provided in an embodiment of this application;

[0036] Figure 13 This is a partial cross-sectional schematic diagram of a disconnecting switch provided in an embodiment of this application;

[0037] Figure 14 An exploded view of another top-level second switch unit provided in an embodiment of this application;

[0038] Figure 15 This is a partial cross-sectional view of another disconnecting switch provided in an embodiment of this application;

[0039] Figure 16 An exploded view of the top-level second switch unit and an adjacent second switch unit provided in an embodiment of this application;

[0040] Figure 17 An exploded view of the second switching unit provided in an embodiment of this application;

[0041] Figure 18 This is an exploded view of the second switching unit from another perspective, as provided in an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10-Drive mechanism; 11-Drive assembly; 12-Output shaft; 20-First switching unit; 21-First housing; 211-First protrusion; 22-First moving contact; 23-First stationary contact; 231-First inlet stationary contact; 232-First outlet stationary contact; 24-First support structure; 241-First base; 2411-Mounting space; 2412-First slot; 2413-First substrate; 2414a-First limiting part; 2414b-Third limiting part; 2415-Second protrusion; 242-First top cover; 2421-First snap-fit ​​part; 2422-First mating part; 2423-Mounting hole; 30-Second switching unit; 31-Second housing; 311-Guide groove; 32- 33-Second moving contact; 331-Second incoming stationary contact; 332-Second outgoing stationary contact; 34-Second support structure; 341-Second top cover; 3411-Cover plate; 3412a-First limiting protrusion; 3412b-Second limiting protrusion; 3413-Plug-in part; 3414-Second mating part; 3415-Second snap-fit ​​part; 342-Second base; 3421-Second substrate; 3422-Second limiting part; 3423-Second slot; 3424-Guide protrusion; 40-Drive shaft; 41-Connecting rod; 42-Protrusion; 100-Isolating switch; 200-Controller; 300-Circuit board; 400-Housing shell; 1000-Photovoltaic inverter; 2000-Photovoltaic string. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0045] Please see Figure 1 , Figure 1This is a schematic diagram of a photovoltaic power supply system according to an embodiment of this application. The photovoltaic power supply system includes a photovoltaic inverter 1000 and a photovoltaic string 2000. The photovoltaic inverter 1000 is used to convert the direct current (DC) from the photovoltaic string 2000 into alternating current (AC) and supply the AC to the grid or a load (not shown). Specifically, the photovoltaic inverter 1000 includes multiple DC terminals, a disconnect switch 100, a DC / DC circuit, DC buses BUS+ and BUS-, a DC / AC circuit, a grid-connected switch, and a controller 200. The DC / DC circuit and the DC / AC circuit can be collectively referred to as a DC-DC converter circuit. The disconnect switch 100 is used to connect the photovoltaic string 2000 and the DC-DC converter circuit. In practical applications, the isolating switch 100 is a DC switch. The photovoltaic string 2000 is connected to the DC terminal, thus transmitting DC power to the DC / DC circuit through the isolating switch 100. The DC / DC circuit transforms the DC power and transmits it to the DC / AC circuit through the DC bus. Subsequently, the DC / AC circuit converts the DC power into AC power and transmits it to the grid or load through the grid-connected switch. Further, the isolating switch 100 includes a first switching unit 20, a second switching unit 30, and a trip unit. One end of the first switching unit 20 and one end of the second switching unit 30 are used to connect one or more parallel photovoltaic strings 2000. One photovoltaic string 2000 includes multiple photovoltaic modules connected in series. The other end of the first switching unit 20 and the other end of the second switching unit 30 are used to connect to the DC / DC circuit. The trip unit receives the trip signal from the controller 200, and thus, when the current flowing through the switching unit is abnormal, it promptly trips the isolating switch 100 to eliminate the fault. In this configuration, the current-carrying capacity of the first switching unit 20 is greater than that of the second switching unit 30. For example, when the DC current of each photovoltaic string 2000 is the same, the number of photovoltaic strings 2000 connected to one end of the first switching unit 20 is greater than the number of photovoltaic strings 2000 connected to one end of the second switching unit 30. For instance, when the current flowing through at least one switching unit (first switching unit 20 or second switching unit 30) of the disconnector 100 exceeds a set threshold, or when the current flowing through at least one switching unit (first switching unit 20 or second switching unit 30) of the disconnector 100 is a reverse current, the controller 200 sends a trip signal to the trip unit, thereby causing the trip unit to release the corresponding linkage structure in a timely manner, achieving reliable disconnection of the aforementioned at least one switching unit.It is worth mentioning that when the photovoltaic power supply system is working normally, the current between the photovoltaic string 2000 and the photovoltaic inverter 1000 is a forward current. The direction of the forward current is from the photovoltaic string 2000 to the DC / DC circuit. When the photovoltaic string 2000 is reverse-connected or a short-circuit fault occurs, the photovoltaic power supply system will have a reverse current. The direction of the reverse current is from the DC / DC circuit to the photovoltaic panel, or from other photovoltaic strings 2000 connected in parallel with the reverse-connected or short-circuited photovoltaic string 2000 to the reverse-connected or short-circuited photovoltaic string 2000. For example, when the positive terminal of the photovoltaic string 2000 is connected to the negative terminal of the DC terminal and the negative terminal of the photovoltaic string 2000 is connected to the positive terminal of the DC terminal, i.e. when the photovoltaic string 2000 is reverse-connected, or when one photovoltaic string 2000 is short-circuited, the equivalent impedance of either of the two photovoltaic strings 2000 will be much lower than the equivalent impedance of the photovoltaic inverter 1000. Therefore, the current of other photovoltaic strings 2000 connected in parallel with the two photovoltaic strings 2000 will be directly injected into the two photovoltaic strings 2000. At this time, the current on the switching unit connected to either of the two photovoltaic strings 2000 is the reverse current.

[0046] Please see Figure 2 , Figure 2 This is a simplified structural diagram of a photovoltaic inverter 1000 provided in one embodiment of this application. The photovoltaic inverter 1000 includes a disconnect switch 100, a controller 200, a circuit board 300, and a housing 400. The circuit board 300 and the controller 200 fixed to the circuit board 300 are housed within the housing 400. The disconnect switch 100 is also fixed to the circuit board 300 and partially housed within the housing 400. Specifically, the disconnect switch 100 includes a drive mechanism 10, a first switch unit 20, a second switch unit 30, and a drive shaft. The drive mechanism 10, the first switch unit 20, the second switch unit 30, and the drive shaft are all located within the housing 400. The drive mechanism 10 may include a drive assembly 11 and an output shaft 12. The drive assembly 11 may include a trip unit and a linkage structure. The drive assembly 11 can be operated under the drive of a motor or a handle to release the corresponding linkage structure, thereby causing the linkage structure to operate to drive the first switch unit 20 and the second switch unit 30 to close or open. In practical applications, users can rotate the handle to drive the drive assembly 11 and the transmission shaft 40 to move, thereby driving the first switch unit 20 and the second switch unit 30 to close or open.

[0047] Please see Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of a disconnector switch 100 provided in an embodiment of this application. Figure 4This is a cross-sectional view of a disconnector 100 according to an embodiment of this application. The disconnector 100 includes a drive mechanism 10, a plurality of first switch units 20, a plurality of second switch units 30, and a drive shaft 40, wherein the current carrying capacity of the first switch units 20 is greater than that of the second switch units 30.

[0048] The drive mechanism 10 includes a drive assembly 11 and an output shaft 12. The drive assembly 11, a plurality of first switching units 20, and a plurality of second switching units 30 are stacked along the axial direction of the output shaft 12, wherein the drive assembly 11 is further away from the plurality of second switching units 30 in the axial direction of the output shaft 12 relative to the plurality of first switching units 20. The drive assembly 11 is connected to the output shaft 12 and is used to drive the output shaft 12 to rotate. The axial direction of the output shaft 12 is parallel to the axial direction of the transmission shaft 40.

[0049] Each first switching unit 20 includes a first housing 21, a first moving contact 22, a first stationary contact 23, and a first support structure 24. The first housing 21 houses the first moving contact 22, a portion of the first stationary contact 23, and the first support structure 24. The first moving contact 22 is fixed to the first support structure 24. A portion of the first stationary contact 23 is housed within the first housing 21, while a portion of the first stationary contact 23 protrudes from the first housing 21. The first moving contacts 22 of two adjacent first switching units 20 are fixedly connected via their respective first support structures 24. The first support structure 24 of the first switching unit 20 closest to the drive assembly 11 is connected to the output shaft 12. The output shaft 12 drives each first moving contact 22 to rotate via the first support structure 24, causing the first moving contact 22 of each first switching unit 20 to contact or separate from the first stationary contact 23. When the first moving contact 22 contacts the first stationary contact 23, the first switching unit 20 is closed; when the first moving contact 22 separates from the first stationary contact 23, the first switching unit 20 is open.

[0050] Each second switching unit 30 includes a second housing 31, a second moving contact 32, and a second stationary contact 33. The second housing 31 houses the second moving contact 32 and a portion of the second stationary contact 33. A drive shaft 40 passes through the second moving contacts 32 of the multiple second switching units 30 and is connected to a first support structure 24 that is closest to the second switching unit 30 in the axial direction of the drive shaft 40. A first moving contact 22 is provided between the drive shaft 40 and the output shaft 12 along the axial direction of the drive shaft 40. That is, the drive shaft 40 and the first moving contact 22 are spaced apart in the axial direction of the drive shaft 40, and the output shaft 12 and the first moving contact 22 are spaced apart in the axial direction of the drive shaft 40. Neither the drive shaft 40 nor the output shaft 12 directly contacts the first moving contact 22. The axial direction of the drive shaft 40 is parallel to the axial direction of the output shaft 12. The drive shaft 40 is used to drive each second moving contact 32 to rotate under the drive of the first support structure 24 closest to the second switch unit 30 in its axial direction, so that the second moving contact 32 of each second switch unit 30 contacts or separates from the second stationary contact 33. When the second moving contact 32 contacts the second stationary contact 33, the second switch unit 30 is closed; when the second moving contact 32 separates from the second stationary contact 33, the second switch unit 30 is open.

[0051] In the disconnector switch 100 of this application, neither the output shaft 12 nor the drive shaft 40 directly contacts the first moving contact 22. The output shaft 12 indirectly drives the first moving contact 22 to rotate through the first support structure 24 closest to the drive assembly 11 in its axial direction. This eliminates the need to open a shaft hole in the first moving contact 22 for the output shaft 12 to pass through, ensuring the integrity of the structure of the first moving contact 22. This makes the current-carrying part (first moving contact 22 and first stationary contact 23) in the first switch unit 20 structurally complete, and the first switch unit 20 can be used to carry large currents. In the second switch unit 30, the drive shaft 40 passes through multiple second moving contacts 32 of the second switch unit 30. The drive shaft 40 can directly drive the second moving contact 32 to rotate under the drive of the first support structure 24 closest to the second switch unit 30 in its axial direction. That is, the operating force transmitted from the first support structure 24 will not decrease layer by layer under the drive of the drive shaft 40, improving the synchronization of the second switch unit 30. In summary, the disconnector switch 100 combines the indirect drive of the first moving contact 22 with the direct drive of the second moving contact 32, achieving better synchronization while meeting the requirements of high-current applications.

[0052] In one embodiment, the first moving contact 22 includes at least two stacked metal sheets, and each end of the first moving contact 22 includes a bayonet. The output shaft 12 and the drive shaft 40 do not pass through the metal sheets of the first moving contact 22. Therefore, the metal sheets constituting the first moving contact 22 do not require shaft holes for the output shaft 12 or the drive shaft 40 to pass through, ensuring the structural integrity of the metal sheets constituting the first moving contact 22 and resulting in better current-carrying capacity of the first switching unit 20.

[0053] The first stationary contact 23 includes a first incoming stationary contact 231 and a first outgoing stationary contact 232. The first incoming stationary contact 231 is used to connect to the photovoltaic string, and the first outgoing stationary contact 232 is electrically connected to the circuit board. When the output shaft 12 drives each first moving contact 22 to rotate through the first support structure 24, when the first moving contact 22 rotates to a suitable angle (for example, 90°), the two ends of the first moving contact 22 clamp the first incoming stationary contact 231 and the first outgoing stationary contact 232 through a bayonet, thereby realizing the conductive contact between the first moving contact 22 and the first incoming stationary contact 231, as well as the conductive contact between the first moving contact 22 and the first outgoing stationary contact 232.

[0054] In one embodiment, each first support structure 24 includes a first base 241 and a first top cover 242 connected to each other. The first base 241 is mounted on the first housing 21 and houses a first moving contact 22 and a portion of a first stationary contact 23. The first moving contact 22 is disposed between the first top cover 242 and the first base 241. The first top cover 242 and the first base 241 can be connected and fixed by a snap-fit ​​mechanism. The first top cover 242 and the first base 241 can be used to limit the first moving contact 22 in the axial direction of the output shaft 12, reducing the possibility of the first moving contact 22 shifting in the axial direction of the output shaft 12 during rotation.

[0055] Please combine them together Figure 4 and Figure 5 , Figure 5 This is an exploded view of the first switching unit 20 from one perspective, according to an embodiment of this application. Each first base 241 is provided with a mounting space 2411 and a first slot 2412. The mounting space 2411 is used to accommodate a first moving contact 22 and part of a first stationary contact 23. The first moving contact 22 is fixed within the mounting space 2411. The two side walls surrounding the mounting space 2411 can limit the movement of the first moving contact 22 in a direction perpendicular to the axial direction of the output shaft 12. The first slot 2412 is located outside the mounting space 2411. The first top cover 242 may be provided with a first engaging portion 2421 that engages with the first slot 2412. The first engaging portion 2421 extends into the first slot 2412 and engages with the side wall of the first slot 2412, thereby achieving the connection and fixation between the first base 241 and the first top cover 242 in the same first support structure 24.

[0056] The first top cover 242, which is closest to the drive assembly 11 along the axial direction of the output shaft 12, is connected to the output shaft 12. The first base 241, which is furthest from the drive assembly 11 along the axial direction of the output shaft 12, is connected to the transmission shaft 40. In two adjacent first support structures 24, the first base 241 of one first support structure 24 is connected to the first top cover 242 of the other first support structure 24. For ease of description, the first switching unit 20 closest to the drive assembly 11 along the axial direction of the output shaft 12 is referred to as the top-level first switching unit 20, the first switching unit 20 furthest from the drive assembly 11 along the axial direction of the output shaft 12 is referred to as the bottom-level first switching unit 20, and the remaining first switching units 20 are referred to as the intermediate-level first switching units 20. Thus, the first top cover 242 of the top-layer first switch unit 20 drives the first base 241 of the top-layer first switch unit 20 to rotate under the operating force transmitted from the output shaft 12. The operating force transmitted from the top-layer first base 241 then drives the first top cover 242 and the first base 241 of the next layer first switch unit 20 to rotate. The intermediate layer first switch unit 20 achieves layer-by-layer linkage through the first base 241 and the first top cover 242 of the adjacent two layers. Each first moving contact 22 rotates together with its corresponding first base 241. The first moving contact 22 does not need to be directly connected to the output shaft 12, ensuring the structural integrity of the first moving contact 22 of each first switch unit 20, so that the current carrying capacity of each first switch unit 20 is guaranteed, thereby enabling the isolating switch 100 to have a good large current carrying capacity.

[0057] Please combine them together Figure 4 and Figure 6 , Figure 6This is an exploded structural diagram of a bottom first switching unit 20 and an adjacent first switching unit 20 provided in an embodiment of this application. In one embodiment, each first base 241 includes a first substrate 2413, and a first moving contact 22 is provided between the first substrate 2413 and the first top cover 242. The first substrate 2413 furthest from the driving component 11 is provided with a first limiting portion 2414a, which is located on the side of the first substrate 2413 facing the second switching unit 30. The first substrate 2413 furthest from the driving component 11 and the first limiting portion 2414a can be an integral structure or a separate structure, and there is no specific limitation. The first limiting part 2414a is connected to the end of the transmission shaft 40 facing the first switching unit 20. The transmission between the first switching unit 20 and the transmission shaft 40 is directly connected through the first limiting part 2414a. The first limiting part 2414a is located on the side of the first base plate 2413 furthest from the drive assembly 11 facing the second switching unit 30. The transmission shaft 40 does not pass through the first moving contact 22. When the first moving contact 22 and the first base 241 rotate, the operating force can be transmitted to the transmission shaft 40 through the first base 241 furthest from the drive assembly 11. The transmission shaft 40 can drive the second moving contacts 32 of multiple second switching units 30 to rotate. While ensuring the structural integrity of the first moving contact 22, the operating force transmitted from the first base 241 furthest from the drive assembly 11 will not be attenuated layer by layer in the second switching unit 30. The opening and closing synchronism of multiple second switching units 30 is consistent, so that the disconnecting switch 100 as a whole has good synchronism.

[0058] For example, the first limiting part 2414a can be a groove provided on the first base 241 facing the second switch unit 30. The outline shape of the first limiting part 2414a is adapted to the end of the drive shaft 40 facing the first switch unit 20. The first limiting part 2414a and the end of the drive shaft 40 facing the first switch unit 20 are fitted together, simplifying the connection method between the two. When the first limiting part 2414a with the groove structure is fitted with the drive shaft 40, there is no need to cut a groove in the drive shaft 40, ensuring the structural strength of the drive shaft 40.

[0059] The first substrate 2413 of the remaining first switching units 20 is provided with a third limiting portion 2414b, that is, the first substrate 2413 of the top layer first switching unit 20 and the first substrate 2413 of the middle layer first switching unit 20 are both provided with a third limiting portion 2414b.

[0060] The first top cover 242 is provided with a first mating part 2422. The first mating part 2422 of the top first switch unit 20 is used to connect with the output shaft 12. The first mating parts 2422 of the remaining first switch units 20 are used to connect with the third limiting part 2414b of an adjacent first switch unit 20. The cross-sectional outer contour shape of the third limiting part 2414b is rectangular, and the cross-sectional outer contour shape of the first mating part 2422 is also rectangular. The cross-sections of the third limiting part 2414b and the first mating part 2422 are both perpendicular to the axial direction of the transmission shaft 40. The first mating part 2422 is one of the groove or protrusion structures, and the third limiting part 2414b is the other of the groove or protrusion structure, realizing the limiting between the layers of the first switch units 20 and improving the linkage reliability between the layers of the first switch units 20. For example, the third limiting part 2414b is a groove, and the first mating part 2422 is a protruding structure. The protruding structure is provided with a mounting hole 2423 (the mounting hole 2423 is a blind hole or a through hole) that mates with the output shaft 12. This eliminates the need to slot the output shaft 12, ensuring the structural strength of the output shaft 12. It also facilitates the mating connection between the first mating part 2422, which has a protruding structure, and the third limiting part 2414b, which has a groove. Furthermore, it facilitates the insertion of the output shaft 12 into the mounting hole 2423 of the protruding structure.

[0061] Please combine Figure 7 , Figure 7 This is a three-dimensional structural diagram of a drive shaft 40 according to an embodiment of this application. In one embodiment, the drive shaft 40 is a square shaft, in which case the cross-sectional shape of the drive shaft 40 is rectangular. Figure 6 As shown, the cross-sectional shape of the first limiting part 2414a is rectangular. The drive shaft 40 is embedded in the first limiting part 2414a of the bottom first switch unit 20, so as to realize the connection between the drive shaft 40 and the first base 241 of the bottom first switch unit 20. At the same time, when the drive shaft 40 with the rectangular cross-sectional shape and the first limiting part 2414a are in contact, it can also play a limiting role.

[0062] In one embodiment, the cross-sectional outer contour shape of the first limiting portion 2414a is different from the cross-sectional outer contour shape of the third limiting portion 2414b.

[0063] Please combine Figure 5 , Figure 6 and Figure 8 , Figure 8 This is a schematic diagram of the structure of a first base 241 of a bottom first switch unit 20 provided in an embodiment of this application. The cross-sectional outer contour shape of the first limiting part 2414a is rectangular (e.g., Figure 8 As shown), the cross-sectional outer contour shape of the third limiting part 2414b is a cross shape (as shown). Figure 6As shown), correspondingly, the cross-sectional outer contour shape of all first mating parts 2422 is also "+" shaped, which facilitates the opening of mounting holes 2423 in the first mating parts 2422 of the top-layer first switch unit 20 (such as...). Figure 5 As shown in the figure, this ensures the overall structural strength of the first mating part 2422, thereby effectively improving the reliability of the interlayer transmission of the first switching unit 20.

[0064] Please see Figure 9 and Figure 10 , Figure 9 This is a cross-sectional view of another disconnector switch 100 provided in an embodiment of this application. Figure 10 This is a three-dimensional structural diagram of another drive shaft 40 provided in one embodiment of this application. In one embodiment, the drive shaft 40 includes a connecting rod 41 and a protrusion 42. The end of the connecting rod 41 facing the first switch unit 20 is connected and fixed to the protrusion 42. The connecting rod 41 and the protrusion 42 can be an integrally formed structure, or they can be separate structures, connected and fixed by welding or snap-fitting. The connecting rod 41 passes through multiple second switch units 30, and the connecting rod 41 can be a square shaft. A portion of the protrusion 42 protrudes relative to the connecting rod 41 in a direction perpendicular to the axial direction of the drive shaft 40. The protrusion 42 is engaged with a first limiting portion 2414a. For example, the first limiting portion 2414a is a groove, and the protrusion 42 is embedded in the first limiting portion 2414a of the bottom first switch unit 20.

[0065] Please combine Figure 11 , Figure 11 This is a three-dimensional structural schematic diagram of another first base 241 of the bottom first switch unit 20 provided in an embodiment of this application. The outer contour shape of the cross-section of the protrusion 42 is adapted to the outer contour shape of the cross-section of the first limiting portion 2414a, for example, as... Figure 10 As shown, the cross-sectional outer contour of protrusion 42 is a cross shape. Figure 11 As shown, the cross-sectional outer contour shape of the first limiting part 2414a of the bottom first switch unit 20 is also "+" shaped. The setting of the protrusion 42 strengthens the connection strength between the transmission shaft 40 and the first base 241 of the bottom first switch unit 20, thereby effectively improving the transmission reliability between the first switch unit 20 and the second switch unit 30. In this example, the third limiting part 2414b and the first limiting part 2414a can have the same structure, that is, the outer contour shapes of the third limiting part 2414b and the first limiting part 2414a are exactly the same. For example, the cross-sectional outer contour shapes of the third limiting part 2414b and the first limiting part 2414a are both "+". In this way, the first top cover 242 can be injection molded using the same mold, which is beneficial to saving costs.

[0066] Please combine Figure 9 and Figure 11In one embodiment, the first housing 21 is provided with a first protrusion 211, which faces the first base 241 in the axial direction of the transmission shaft 40. The first substrate 2413 is provided with a second protrusion 2415 on the side facing the second switch unit 30. The second protrusion 2415 of the bottom first switch unit 20 is arranged around the first limiting part 2414a, and the second protrusion 2415 of the remaining first switch units 20 is arranged around the third limiting part 2414b. The second protrusion 2415 is sleeved on the outer periphery of the first protrusion 211. When the first base 241 rotates relative to the first housing 21, the cooperation of the first protrusion 211 and the second protrusion 2415 can limit the first base 241.

[0067] For ease of description, the second switch unit 30 closest to the first switch unit 20 along the axial direction of the drive shaft 40 is referred to as the top layer second switch unit 30, the second switch unit 30 furthest from the first switch unit 20 along the axial direction of the drive shaft 40 is referred to as the bottom layer second switch unit 30, and the remaining second switch units 30 are referred to as the middle layer second switch units 30.

[0068] Please see Figure 12 and Figure 13 , Figure 12 This is an exploded view of a top-level second switch unit 30 provided in an embodiment of this application. Figure 13 This is a partial cross-sectional view of a disconnector 100 provided in an embodiment of this application. The second moving contact 32 includes at least two stacked metal sheets, and each of the two ends of the second moving contact 32 includes a bayonet. The drive shaft 40 passes through the metal sheets of the second moving contact 32. The second stationary contact 33 includes a second incoming stationary contact 331 and a second outgoing stationary contact 332. The second incoming stationary contact 331 is used to connect to a photovoltaic string, and the second outgoing stationary contact 332 is electrically connected to the circuit board. When the first support structure 24 of the bottom first switch unit 20 drives the drive shaft 40 to rotate, each of the second moving contacts 32 rotates simultaneously by a suitable angle (e.g., 90°). The two ends of the second moving contact 32 clamp the second incoming stationary contact 331 and the second outgoing stationary contact 332 through the bayonet, thereby achieving conductive contact between the second moving contact 32 and the second incoming stationary contact 331, and between the second moving contact 32 and the second outgoing stationary contact 332.

[0069] Each second switch unit 30 includes a second support structure 34, which is mounted on the second housing 31. A drive shaft 40 passes through the second support structure 34 and the second moving contact 32 to drive the second support structure 34 and the second moving contact 32 to rotate relative to the second housing 31.

[0070] In one embodiment, each second support structure 34 includes a second top cover 341, which is disposed on the side of the second moving contact 32 facing the first switching unit 20 and is connected and fixed to the second moving contact 32. The drive shaft 40 passes through the second top cover 341 and the second housing 31. The second top cover 341 includes a cover plate 3411 sleeved on the drive shaft 40. In each second switching unit 30, the cover plate 3411 is disposed on the side of the second moving contact 32 facing the first switching unit 20 and is connected and fixed to the second moving contact 32. The cover plate 3411 is located between two adjacent second moving contacts 32 along the axial direction of the drive shaft 40. Thus, when the cover plate 3411 is made of insulating material, it can provide insulation protection for the two adjacent second moving contacts 32, reducing the possibility of accidental conduction of the moving contact portions of two adjacent second switching units 30. The cover plate 3411 closest to the first switch unit 20 (i.e., the top-level second switch unit 30) is provided with a first limiting protrusion 3412a. The first limiting protrusion 3412a is located on the side of the cover plate 3411 of the top-level second switch unit 30 facing away from the second moving contact 32. The first limiting protrusion 3412a is sleeved on the drive shaft 40 and is engaged with the first limiting part 2414a. Through the engagement of the first limiting protrusion 3412a and the first limiting part 2414a, the limiting between the connected second switch unit 30 and the first switch unit 20 can be achieved. At the same time, the first limiting protrusion 3412a is sleeved on the outside of the drive shaft 40, and the drive shaft 40 can be engaged with the first limiting part 2414a through the first limiting protrusion 3412a, which helps to improve the reliability of the connection between the drive shaft 40 and the first limiting part 2414a.

[0071] The first limiting protrusion 3412a is connected to the first limiting part 2414a, and the outer contour shape of the cross-section of the first limiting protrusion 3412a is adapted to the outer contour shape of the cross-section of the first limiting part 2414a. For example, when the drive shaft 40 is a square shaft, the outer contour shape of the cross-section of the first limiting protrusion 3412a is rectangular, such as... Figure 12 As shown. The first limiting protrusion 3412a is connected to the first limiting part 2414a, which has a rectangular cross-sectional outer contour. For example, when the first limiting protrusion 3412a and the first limiting part 2414a are fitted together... Figure 13 As shown. The drive shaft 40 is fixed to the first limiting part 2414a by the first limiting protrusion 3412a. When the first limiting protrusion 3412a is made of insulating material, the first limiting protrusion 3412a can also provide insulation protection for the drive shaft 40, reducing the interference between the drive shaft 40 and the first moving contact 22, or between the drive shaft 40 and the second moving contact 32.

[0072] Please combine Figure 14 and Figure 15 , Figure 14An exploded view of another top-level second switch unit 30 provided in an embodiment of this application. Figure 15 This is a partial cross-sectional view of another disconnector switch 100 provided in one embodiment of this application. For example, when the drive shaft 40 includes a connecting rod 41 and a protrusion 42, the outer contour of the first limiting protrusion 3412a is a cross shape, such as... Figure 14 As shown. The first limiting protrusion 3412a is located on the side of the protrusion 42 facing the second moving contact 32 and is connected to the first limiting portion 2414a. At this time, the protrusion 42 and the first limiting protrusion 3412a are located within the first limiting portion 2414a, as shown. Figure 15 As shown, the two can work together to limit and fix the protrusion 42, making the connection between the drive shaft 40 and the first limiting part 2414a more reliable.

[0073] In one embodiment, each cover plate 3411 has a plug-in portion 3413 on the side facing the second moving contact 32. The plug-in portion 3413 passes through the second moving contact 32 and is sleeved on the drive shaft 40. The plug-in portion 3413 can limit the portion of the drive shaft 40 located on the side of the cover plate 3411 facing the second moving contact 32, making the drive shaft 40 more reliable during transmission. The plug-in portion 3413 is a protruding ring structure relative to the cover plate 3411. The plug-in portion 3413 is located between the second moving contact 32 and the drive shaft 40 in a direction perpendicular to the axial direction of the drive shaft 40. That is, the plug-in portion 3413 is sleeved outside the drive shaft 40, and the second moving contact 32 is sleeved outside the plug-in portion 3413. In this way, the plug-in portion 3413 can also limit and fix the second moving contact 32, while isolating the drive shaft 40 and the second moving contact 32, providing insulation and protection for the second moving contact 32 and the drive shaft 40.

[0074] Furthermore, the cover plates 3411 of the remaining second switch units 30 are provided with second limiting protrusions 3412b, that is, the cover plates 3411 of the middle layer second switch units 30 and the cover plates 3411 of the bottom layer second switch units 30 are both provided with second limiting protrusions 3412b. The second limiting protrusions 3412b are provided on the side of their respective cover plates 3411 facing the first switch unit 20, and the second limiting protrusions 3412b are sleeved on the drive shaft 40. Between two adjacent second switch units 30, the insertion part 3413 of one second switch unit 30 is engaged with the second limiting protrusion 3412b of the other second switch unit 30. Specifically, since both the insertion part 3413 and the second limiting protrusion 3412b are sleeved on the drive shaft 40. In two adjacent second switch units 30, the plug portion 3413 of the second switch unit 30 closer to the first switch unit 20 and the second limiting protrusion 3412b of the other second switch unit 30 are connected and fixed by a nested engagement, which can strengthen the connection between the two adjacent second top covers 341.

[0075] Please combine Figure 16 , Figure 16 This is an exploded structural diagram of the top-level second switch unit 30 and an adjacent second switch unit 30 provided in an embodiment of this application. In one embodiment, the outer contour shape of the cross-section of the second limiting protrusion 3412b is rectangular, adapted to a drive shaft 40 or connecting rod 41 that is a square shaft. When the outer contour shape of the cross-section of the first limiting protrusion 3412a is rectangular (e.g., ... Figure 12 As shown, the structure of the second limiting protrusion 3412b is the same as that of the first limiting protrusion 3412a.

[0076] Please combine Figure 15 and Figure 16 In one embodiment, each second support structure 34 further includes a second base 342, which is fixed inside the second housing 31. The second base 342 can be used to support the second moving contact 32. The second base 342 is located on the side of the second moving contact 32 away from the cover plate 3411, that is, the second moving contact 32 is provided between the second base 342 and the cover plate 3411.

[0077] Please combine them together Figure 17 and Figure 18 , Figure 17 This is an exploded view of the second switching unit 30 from one perspective, provided in an embodiment of this application. Figure 18 This is an exploded view of the second switching unit 30 from another perspective, provided in an embodiment of this application. For example, the second base 342 includes a second substrate 3421 and a second limiting portion 3422. The second substrate 3421 is sleeved on the insertion portion 3413. A second moving contact 32 is provided between the second substrate 3421 and the cover plate 3411. The second limiting portion 3422 is located on the side of the second substrate 3421 facing away from the second moving contact 32. When the second base 342 and the second top cover 341 are assembled, the second limiting portion 3422 surrounds the insertion portion 3413. Specifically, in the same second switching unit 30, the second substrate 3421 and the second limiting portion 3422 are sleeved on the insertion portion 3413 of the second top cover 341, which is connected and fixed to the second base 342.

[0078] The cover plate 3411 has a second mating portion 3414 on the side opposite to the second moving contact 32. The second mating portion 3414 of the top-level second switching unit 30 is arranged around the first limiting protrusion 3412a and located on the periphery of the first limiting protrusion 3412a. That is, the second mating portion 3414 is further away from the first limiting protrusion 3412a in the direction perpendicular to the axial direction of the transmission shaft 40. The second mating portions 3414 of the other second switching units 30 are arranged around the second limiting protrusion 3412b and located on the periphery of the second limiting protrusion 3412b. The structure of the second mating portion 3414 of the top-level second switching unit 30 can be the same as or different from the structure of the second mating portions 3414 of the other second switching units 30, and is not specifically limited.

[0079] Since the second limiting part 3422 is provided on the side of the second substrate 3421 opposite to the second moving contact 32, in two adjacent second switching units 30, the second limiting part 3422 of the second switching unit 30 further away from the first switching unit 20 is connected to the second mating part 3414 of the other second switching unit 30. For example, both the second limiting part 3422 and the second mating part 3414 are convex ring structures, and the second limiting part 3422 is sleeved on the periphery of the second mating part 3414. In two adjacent second top covers 341, the insertion part 3413 of the second switching unit 30 closer to the first switching unit 20 is connected to the second top cover 341 of the other second switching unit 30. Therefore, after the insertion part 3413 of the second switching unit 30 closer to the first switching unit 20 passes through the second base 342 of the same second switching unit 30, it is connected to the second limiting protrusion 3412b of the other second switching unit 30. In this way, the mutual connection between the second top covers 341 of the two adjacent second switching units 30 is realized. In summary, the arrangement of the second top cover 341 and the second base 342 makes the connection between the second base 342 and the two adjacent second top covers 341, as well as the connection between the two adjacent second top covers 341, more reliable, ensuring reliable inter-layer limiting and linkage of each second switch unit 30.

[0080] For example, in the direction perpendicular to the axial direction of the drive shaft 40, a portion of the insertion part 3413 is located between the second limiting protrusion 3412b and the second mating part 3414. In other words, the groove formed between the second limiting protrusion 3412b and the second mating part 3414 is used for a portion of the insertion part 3413. Thus, both the second limiting protrusion 3412b and the second mating part 3414 can limit and fix the insertion part 3413.

[0081] For example, the second base 342 and the second cover 341 in the same second support structure 34 are connected and fixed to each other. For example, the second base 342 is provided with a second slot 3423, and the cover plate 3411 is provided with a second snap-fit ​​part 3415 on the side facing the second base 342. The second snap-fit ​​part 3415 extends into the second slot 3423 and engages with the side wall of the second slot 3423. The connection between the second base 342 and the cover plate 3411 is simple and easy to implement.

[0082] In this application, the cover plate 3411, the first limiting protrusion 3412a, the insertion part 3413, the second mating part 3414, and the second snap-fit ​​part 3415 can be integrally molded structures. The cover plate 3411, the second limiting protrusion 3412b, the insertion part 3413, the second mating part 3414, and the second snap-fit ​​part 3415 can be integrally molded structures, such as forming an integral structure by injection molding, thereby reducing the connection between components.

[0083] In one embodiment, the second housing 31 is provided with one of a guide groove 311 and a guide protrusion 3424, and the second base plate 3421 is provided with the other of a guide groove 311 and a guide protrusion 3424 on the side opposite to the second moving contact 32. The guide protrusion 3424 extends into the guide groove 311 to realize the guide connection between the second base 342 and the second housing 31. In this way, when the transmission shaft 40 drives the second support structure 34 and the second moving contact 32 to rotate, the second base 342 is less likely to deviate from the second housing 31 when rotating relative to the second housing 31 with the cooperation of the guide groove 311 and the guide protrusion 3424.

[0084] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A photovoltaic inverter, characterized in that, The photovoltaic inverter includes an isolation switch and a DC-DC conversion circuit, wherein the isolation switch is used to connect the photovoltaic string and the DC-DC conversion circuit. The disconnecting switch includes a drive mechanism, multiple first switching units, multiple second switching units, and a drive shaft; the current carrying capacity of the first switching units is greater than that of the second switching units. The driving mechanism includes a driving component and an output shaft, wherein the driving component, the plurality of first switching units, and the plurality of second switching units are stacked sequentially; the driving component is connected to the output shaft and is used to drive the output shaft to rotate. Each of the first switching units includes a first moving contact, a first stationary contact, and a first support structure, wherein the first moving contact is fixed to the first support structure; wherein the first moving contacts of two adjacent first switching units are fixedly connected to each other through their respective first support structures, and the first support structure of the first switching unit closest to the driving assembly is connected to the output shaft; the output shaft is used to drive each of the first moving contacts to rotate through the first support structure, so that the first moving contact of each of the first switching units contacts or separates from the first stationary contact; Each of the second switching units includes a second moving contact and a second stationary contact; The drive shaft passes through the second moving contact of the plurality of second switch units and is connected to the first support structure closest to the second switch unit. The drive shaft is used to drive each second moving contact to rotate under the drive of the first support structure closest to the second switch unit, so that the second moving contact of each second switch unit contacts or separates from the second stationary contact.

2. The photovoltaic inverter according to claim 1, characterized in that, Each of the first support structures includes a first base and a first top cover that are interconnected. The first base houses the first moving contact and a portion of the first stationary contact, and the first moving contact is disposed between the first base and the first top cover. In two adjacent first support structures, the first base of one first support structure is connected to the first top cover of the other first support structure, the first top cover closest to the drive assembly along the axial direction of the output shaft is connected to the output shaft, and the first base furthest from the drive assembly along the axial direction of the output shaft is connected to the transmission shaft.

3. The photovoltaic inverter according to claim 2, characterized in that, Each of the first bases includes a first substrate, and a first movable contact is provided between the first substrate and the first top cover. The first substrate furthest from the drive assembly is provided with a first limiting portion, which is located on the side of the first substrate facing the second switching unit. The first limiting portion is engaged with the end of the drive shaft facing the first switching unit.

4. The photovoltaic inverter according to claim 3, characterized in that, The drive shaft includes a connecting rod and a protrusion. The end of the connecting rod facing the first switch unit is connected to the protrusion, and the connecting rod passes through the plurality of second switch units. The portion of the protrusion protrudes relative to the connecting rod in a direction perpendicular to the axial direction of the drive shaft, and the protrusion is connected to the first limiting portion.

5. The photovoltaic inverter according to any one of claims 3 or 4, characterized in that, Each second switch unit further includes a second top cover, each second top cover including a cover plate sleeved on the drive shaft. The cover plate is located on the side of the second moving contact facing the first switch unit and is connected and fixed to the second moving contact. The cover plate closest to the first switch unit is provided with a first limiting protrusion. The first limiting protrusion is located on the side of the cover plate away from the second moving contact. The first limiting protrusion is sleeved on the drive shaft, and the first limiting portion is engaged with the first limiting protrusion.

6. The photovoltaic inverter according to claim 5, characterized in that, Each of the cover plates has a plug-in portion on the side facing the second moving contact. The plug-in portion passes through the second moving contact and is sleeved on the drive shaft. The plug-in portion is located between the second moving contact and the drive shaft in a direction perpendicular to the axial direction of the drive shaft.

7. The photovoltaic inverter according to claim 6, characterized in that, Except for the second switch unit closest to the first switch unit, the cover plates of the other second switch units are provided with second limiting protrusions. The second limiting protrusions are provided on the side of the cover plate facing the first switch unit, and the second limiting protrusions are sleeved on the drive shaft. Between two adjacent second switch units, the plug-in portion of one second switch unit is engaged with the second limiting protrusion of the other second switch unit.

8. The photovoltaic inverter according to any one of claims 6 or 7, characterized in that, The cover plate is located between two adjacent second moving contacts along the axial direction of the drive shaft.

9. The photovoltaic inverter according to any one of claims 6 or 7, characterized in that, Each of the cover plates has a second mating portion on the side facing away from the second moving contact; each of the second switching units also includes a second base, the second base being disposed on the side of the second moving contact facing away from the cover plate, the second base including a second base plate and a second limiting portion, the second base plate being sleeved on the insertion portion, the second moving contact being disposed between the second base plate and the cover plate, the second limiting portion being disposed on the side of the second base plate facing away from the second moving contact, in two adjacent second switching units, the second limiting portion of the second switching unit closer to the first switching unit is mated and connected with the second mating portion of the other second switching unit.

10. A disconnecting switch, characterized in that, The isolating switch is applied to a photovoltaic inverter, which includes the isolating switch and a DC-DC converter circuit. The isolating switch is used to connect the photovoltaic string and the DC-DC converter circuit. The disconnecting switch includes a drive mechanism, multiple first switching units, multiple second switching units, and a drive shaft. The current carrying capacity of the first switching units is greater than that of the second switching units. The driving mechanism includes a driving component and an output shaft. The driving component, the plurality of first switch units, and the plurality of second switch units are stacked sequentially. The driving component is connected to the output shaft and is used to drive the output shaft to rotate. Each of the first switching units includes a first moving contact, a first stationary contact, and a first support structure, wherein the first moving contact is fixed to the first support structure; wherein the first moving contacts of two adjacent first switching units are fixedly connected to each other through their respective first support structures, and the first support structure of the first switching unit closest to the driving assembly is connected to the output shaft; the output shaft is used to drive each of the first moving contacts to rotate through the first support structure, so that the first moving contact of each of the first switching units contacts or separates from the first stationary contact; Each of the second switching units includes a second moving contact and a second stationary contact; The drive shaft passes through the second moving contact of the plurality of second switch units and is connected to the first support structure closest to the second switch unit. The drive shaft is used to drive each second moving contact to rotate under the drive of the first support structure closest to the second switch unit, so that the second moving contact of each second switch unit contacts or separates from the second stationary contact.

Images