Rotary isolating switch and power converter

Abstract

The utility model provides a rotary disconnecting switch and a power converter. The rotary disconnecting switch comprises a driving mechanism and a plurality of switch units which are sequentially arranged along a first direction. Each switch unit comprises a moving contact assembly, and the driving mechanism drives the moving contact assembly to rotate. The moving contact assembly adjacent to the driving mechanism is a first moving contact assembly, the driving mechanism is connected with the first moving contact assembly and used for applying rotating force to the first moving contact assembly, and every two adjacent moving contact assemblies are connected in an inserted mode. The switch unit farthest from the driving mechanism is a second switch unit, the second switch unit comprises an isolation cover plate, the isolation cover plate comprises an observation hole and a reference mark, the rotation angle of the second moving contact assembly can be visualized, and the connection condition of the rotary isolation switch can be judged according to the position of the second moving contact assembly. The reference mark is located on the peripheral side of the observation hole, a pointer is arranged on the side, facing the isolation cover plate, of the second moving contact assembly, and rotation of the second moving contact assembly is achieved based on the mode that the pointer aligns with the reference mark.

Description

[0001] Cross - Reference to Related Applications

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on October 24, 2023, with application number 202322863929.4 and application name “A Rotary Isolating Switch and Power Converter”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of switchgear, and in particular to a rotary disconnector and a power converter. Background Art

[0004] In photovoltaic systems, rotary isolating switches are often used to achieve the purpose of individually isolating, protecting, and disconnecting photovoltaic panels. Rotary isolating switches are usually composed of several stacked contact assemblies. Each contact assembly includes a housing, a moving contact, and a static contact that cooperates with the moving contact. When the moving contact rotates, it engages or disconnects with the static contact. The synchronous rotation of the moving contacts in two adjacent layers of contact assemblies requires the cooperation of the moving contacts and the connecting mechanism of the two adjacent layers, thereby ensuring the synchronous rotation of the moving and static contacts inside the multi-layer housing. Since the connecting mechanisms of the two adjacent layers are often connected by plug-in connection, the rotation angle of each static contact has deviations due to the influence of the processing tolerance and assembly clearance of the connecting parts. Under the influence of this deviation, it cannot be guaranteed that the moving contacts of each layer are in full contact with their mating static contacts. Moreover, as the number of contact assembly layers increases, this deviation will increase, resulting in poor contact of the rotary isolating switch. Summary of the Invention

[0005] The present application provides a rotary isolating switch and a power converter. The internal operation of the rotary isolating switch is visualized, thereby reducing the situation of poor contact of the rotary isolating switch.

[0006] In a first aspect, the present application provides a rotary disconnector, which includes a driving mechanism and a plurality of switch units. The driving mechanism and the plurality of switch units are sequentially arranged and installed along a first direction. Each switch unit includes a moving contact assembly. Among them, the moving contact assembly adjacent to the driving mechanism is the first moving contact assembly. The driving mechanism is connected to the first moving contact assembly to apply a rotational force to the first moving contact assembly. Two adjacent moving contact assemblies are inserted into each other to sequentially transmit the rotational force, so that the driving mechanism drives the moving contact assemblies of the plurality of switch units to rotate around the axis respectively. The axis direction is the same as the first direction. The switch unit farthest from the driving mechanism is the second switch unit. The moving contact assembly in the second switch unit is the second moving contact assembly. The second switch unit further includes an isolation cover plate, and the isolation cover plate is located on the side of the second moving contact assembly away from the driving mechanism. The isolation cover plate includes an observation hole and a reference mark. The reference mark is located on the periphery of the observation hole. The vertical projections of the observation hole and the second moving contact assembly along the first direction partially overlap. A pointer is provided on the side of the second moving contact assembly facing the isolation cover plate. The rotation of the second moving contact assembly around the axis is realized based on the alignment of the pointer with the reference mark. The observation hole is used to observe the working condition inside the rotary disconnector from the outside of the rotary disconnector. By providing the observation hole and the reference mark on the isolation cover plate, the rotation angle of the second moving contact assembly can be visualized, so as to achieve the effect of observing the position of the second moving contact assembly in real time. Furthermore, the engagement condition of the rotary disconnector can be judged according to the position of the second contact assembly. The situation of poor contact of the rotary disconnector is reduced.

[0007] In a technical solution, the second moving contact assembly includes a connecting mechanism and a moving contact. The connecting mechanism includes a first housing and a second housing. The first housing and the second housing are snap-connected to form a receiving cavity, and the moving contact is fixedly installed in the receiving cavity. The moving contact is fixedly connected to the connecting mechanism and can rotate around the axis together with the connecting mechanism. The connecting mechanism, as a transmission component, acts on the static contact with the rotational force of the driving mechanism, making the transmission of the rotational force reliable.

[0008] In a technical solution, the second housing is located between the first housing and the isolation cover plate. The pointer is provided on the surface of the second housing facing the isolation cover plate. The pointer is perpendicular to the axis, and the extension line of the pointer passes through the axis. The pointer can rotate together with the second housing of the connecting mechanism, and it shows the real-time position of the second moving contact assembly. By observing the positional relationship between the pointer and the reference mark, the rotation condition of the moving contact in the second moving contact assembly can be obtained.

[0009] In a technical solution, the switch unit further includes a static contact. The static contact is installed on the periphery of the moving contact assembly, and the moving contact assembly includes a moving contact. When the driving mechanism drives the moving contact assembly to rotate, the moving contact in the moving contact assembly contacts or separates from the static contact, thereby realizing the engagement or disconnection of the switch unit.

[0010] In a technical solution, the static contact includes a first surface, and the moving contact includes a contact portion. When the contact portion is in contact with the first surface, the switch unit is in a conducting state. The contact portion can slide along the first surface during rotation, and the sliding range is relatively large, so that the moving contact has a certain adjustment space while maintaining the engaged state, improving the reliability of the contact between the moving contact and the static contact.

[0011] In a technical solution, the reference mark is a sector ring, and the center of the sector ring is located on the axis. When the contact portion of the second moving contact assembly contacts the first surface, the perpendicular projection of the pointer in the first direction points to the sector ring. Using the sector ring as a reference mark can intuitively show whether the pointer is in the area range where the switch unit is engaged.

[0012] In a technical solution, the central angle of the above-mentioned sector ring is α. After multiple experimental tests, when α = 7°, the pointer points to the sector ring area, and all the switch units are in the engaged state.

[0013] In a technical solution, the observation hole is coaxially arranged with the moving contact assembly, or the observation hole is located on the periphery of the axis of the moving contact assembly. When the observation hole is in the above position, the working condition inside the rotary disconnector can be observed more clearly.

[0014] In a technical solution, the rotary disconnector further includes an isolation sheet covering the observation hole, and the isolation sheet is made of a transparent insulating material. The isolation sheet seals the isolation cover, improving the insulation performance of the isolation cover.

[0015] In a technical solution, when the rotary disconnector needs to connect 14 strings of photovoltaic panel strings, the number of the above-mentioned switch units is 12, and a better power generation effect can be achieved.

[0016] On the other hand, the present application also provides a power converter, which includes the above-mentioned rotary disconnector, a power conversion circuit, and a housing. The rotary disconnector is fixed to the housing, and the power conversion circuit is located inside the housing. The rotary disconnector is used to connect to a DC source and the power conversion circuit. When the rotary disconnector is closed, the DC source supplies power to the power converter. When the rotary disconnector is opened, the DC source stops supplying power to the power converter. Since the internal components of the above-mentioned rotary disconnector are visually operable, the situation of poor contact is reduced, thereby making the operation of the power converter reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a networking schematic diagram of a photovoltaic power generation system;

[0018] Figure 2 It is a structural schematic diagram of a rotary disconnector in an embodiment of the present application;

[0019] Figure 3 Schematic top view structure of the rotary disconnector in an embodiment of the present application;

[0020] Figure 4 Schematic structure of a switch unit in an embodiment of the present application;

[0021] Figure 5 Partial schematic diagram of the moving contact assembly and the static contact in an embodiment of the present application;

[0022] Figure 6 Front view of the rotary disconnector in an embodiment of the present application;

[0023] Figure 7 Schematic diagram of the isolation cover plate in an embodiment of the present application;

[0024] Figure 8 Schematic structure of the rotary disconnector from another angle in an embodiment of the present application;

[0025] Figure 9 Schematic structure of the insertion connection between the first housing and the second housing of two adjacent connection mechanisms in an embodiment of the present application;

[0026] Figure 10 Schematic structure of the power converter in an embodiment of the present application.

[0027] Reference signs:

[0028] 1 - driving mechanism; 2 - switch unit; 3 - isolation cover plate; 4 - moving contact assembly; 21 - first switch unit; 41 - first moving contact assembly; 22 - second switch unit; 42 - second moving contact assembly; 43 - moving contact; 23 - switch housing; 24 - static contact; 241 - first surface; 431 - contact part; 5 - observation hole; 6 - reference mark; 7 - pointer; 8 - isolation sheet; 11 - operating member; 12 - core shaft; 44 - connection mechanism; 441 - first housing; 442 - second housing; 4411 - second surface; 4421 - third surface; 45 - slot; 46 - pin; 100 - rotary disconnector; 200 - power conversion circuit; 300 - housing; 400 - DC source. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following will further describe this application in detail in conjunction with the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. Identical reference numerals in the figures represent identical or similar structures, and thus their repeated description will be omitted. The words expressing positions and directions described in the embodiments of this application are illustrative with reference to the accompanying drawings, but can be changed as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings in the embodiments of this application are only used to illustrate the relative positional relationship and do not represent the true proportions.

[0030] It should be noted that specific details are set forth in the following description for the purpose of facilitating an understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0031] To facilitate an understanding of the rotary disconnector provided in the embodiments of this application, the following first introduces its application scenario. A photovoltaic power generation system is a system that uses solar energy to generate electricity. It converts solar energy into electrical energy to provide clean and renewable energy for people. Figure 1 is a schematic diagram of the networking of a photovoltaic power generation system, as Figure 1 shown. The photovoltaic power generation system includes an energy storage system and photovoltaic modules. The photovoltaic panels in the photovoltaic modules convert solar energy into direct current through the photovoltaic effect, and the inverter converts the direct current output by the photovoltaic modules into alternating current and further delivers the alternating current to the box-type substation. After the box-type substation converts the low-voltage alternating current output by the inverter into medium-voltage alternating current, it further delivers the alternating current to the step-up substation, the power grid, or the box-type substation corresponding to the energy storage system. The energy storage system is used to store the unstable electrical energy from the photovoltaic modules. The energy storage system includes a plurality of battery clusters connected in parallel, and the battery clusters output stable electrical energy to the power grid through the energy storage converter and the corresponding box-type substation.

[0032] The rotary disconnector is usually connected to the battery cluster or the photovoltaic panel string. When maintenance, repair, or replacement of the battery cluster or the photovoltaic panel string is required, the disconnector needs to be opened to disconnect the circuit. This can ensure that no danger will be caused to personnel and equipment during the maintenance and repair of the photovoltaic power generation system. The disconnector can also be used for the regulation and control of the photovoltaic power generation system.

[0033] The rotary disconnector includes multiple layers of contact assemblies. For example, 14 strings of photovoltaic panel strings are connected to the rotary disconnector, and the rotary disconnector needs to include at least 12 layers of contact assemblies. The above-mentioned multiple layers of contact assemblies usually include a connecting mechanism and a moving contact. The static contacts are stacked and installed in a form of being inserted into each other through the connecting mechanism. When the screwing drive mechanism is rotated, the rotational actions and kinetic energies of the moving contacts closing and disconnecting in each layer of the contact assembly are transmitted layer by layer by the connecting mechanism to achieve the effect of synchronous rotation. Due to the factors of clearance fit, machining tolerance or material deformation existing in the insertion of two adjacent connecting mechanisms, and since the multiple layers of contact assemblies are enclosed and installed inside the housing of the rotary disconnector, the rotation conditions of each layer of the connecting mechanism and the moving contact are not visible from the outside. After rotating the drive mechanism, it cannot be guaranteed that the moving contacts of each layer of the contact assembly are in complete contact with the static contacts that cooperate with them. Especially when the number of layers of the contact assembly is relatively large, the fitting clearances or deformations between the above-mentioned connecting mechanisms will accumulate significantly, and the moving contacts in the contact assembly at the farthest end will have a relatively obvious lack of kinetic energy, resulting in poor contact between the moving contacts and the static contacts of this layer. When the moving contacts of the contact assembly at the far end are in contact with the static contacts, it can be ensured that all the contact assemblies are in a joined state.

[0034] Figure 2 FIG. 4 is a schematic structural view of a rotary disconnector in an embodiment of the present application. Figure 3 FIG. 5 is a top view structural schematic view of a rotary disconnector in an embodiment of the present application. Figure 4 FIG. 8 is a schematic structural view of a switch unit in an embodiment of the present application. As Figures 2 - 4As shown in the figure, to solve the above problems, an embodiment of the present application provides a rotary disconnector, which includes a driving mechanism 1 and a plurality of switch units 2. The driving mechanism 1 and the plurality of switch units 2 are sequentially arranged and installed along the first direction M. Each switch unit 2 includes a moving contact assembly 4. The moving contact assemblies 4 of the plurality of switch units 2 are sequentially arranged along the first direction M. Among them, the switch unit 2 adjacent to the driving mechanism 1 is the first switch unit 21, and correspondingly, the moving contact assembly of the first switch unit 21 is the first moving contact assembly 41. The switch unit 2 farthest from the driving mechanism 1 is the second switch unit 22, and correspondingly, the moving contact assembly 4 of the second switch unit 22 is the second moving contact assembly 42. The driving mechanism 1 is connected to the first moving contact assembly 41 to apply a rotational force to the first moving contact assembly 41. Every two adjacent moving contact assemblies 4 are inserted into each other along the first direction M to enable the driving mechanism 1 to drive the moving contact assemblies 4 of the plurality of switch units 2 to rotate around the axis A respectively, and the direction of the axis A is the same as the first direction M. The above rotational force is sequentially transmitted from the first moving contact assembly 41 at the nearest end close to the driving mechanism 1 to the second moving contact assembly 42 at the farthest end away from the driving mechanism 1. That is to say, the driving mechanism 1 applies the rotational force to the first moving contact assembly 41, and then through the sequential transmission of multiple moving contact assemblies 4, finally transmits the rotational force to the second moving contact assembly 42 at the farthest end away from the driving mechanism 1.

[0035] Figure 5 It is a partial schematic diagram of the moving contact assembly and the static contact in an embodiment of the present application. Combining Figure 4 and Figure 5 , each of the above switch units 2 further includes a switch housing 23 and a static contact 24. The switch housing 23 has an accommodating space, and both the static contact 24 and the moving contact assembly 4 are located in the accommodating space. Among them, the static contact 24 is fixedly installed on the inner wall of the switch housing 23, and the static contact 24 is located on the periphery of the moving contact assembly 4. The moving contact assembly 4 includes a moving contact 43. When the driving mechanism 1 drives the moving contact assembly 4 to rotate counterclockwise around the axis A and the moving contact 43 rotates counterclockwise around the axis A and contacts the static contact 24, the switch unit 2 is in a closed state. When the driving mechanism 1 drives the moving contact assembly 4 to rotate clockwise, the moving contact 43 rotates clockwise around the axis A and separates from the static contact 24, so that the switch unit 2 is in an open state.

[0036] The above-mentioned stationary contact 24 has a first surface 241, and the moving contact 43 includes a contact portion 431. The moving contact 43 rotates counterclockwise relative to the stationary contact 24, so that the contact portion 431 rotates relative to the first surface 241. When the moving contact 43 continues to rotate after contacting the stationary contact 24, the contact portion 431 slides along the first surface 241, and the switch unit 2 is always in the engaged state during this process. When the moving contact 43 continues to rotate counterclockwise and separates from the stationary contact 24, the switch unit 2 is in the break-and-close state. That is to say, when the moving contact 43 rotates counterclockwise around the axis A, within a certain angular range (the first angular range, for example, the first angular range is 7°), from the start of contact to complete separation between the contact portion 431 and the first surface 241, the switch unit 2 is in the engaged state. The contact portion slides on the first surface, and the sliding range is relatively large, so that the moving contact 43 has a certain adjustment space while maintaining the engaged state, improving the reliability of the contact between the moving contact 43 and the stationary contact 24.

[0037] Under the influence of the deviation caused by the clearance fit between the moving contact assemblies 4, when the first moving contact assembly 41 is in the engaged position, the second moving contact assembly 42 located at the farthest end from the drive mechanism 1 may still be in a state where its moving contact 43 and the stationary contact 24 are not in contact. Therefore, the drive mechanism 1 needs to continue to rotate a certain angle to make the moving contact 43 of the second moving contact assembly 42 located at the farthest end contact the stationary contact 24, so that the moving contacts 43 in all the moving contact assemblies 4 are in contact with the stationary contact 24.

[0038] Combined Figure 2 and Figure 3, the switch housing 23 of the second switch unit 22 described above is the second switch housing. The second switch housing includes an isolation cover plate 3. The isolation cover plate 3 is located on the side of the second switch housing away from the drive mechanism 1. That is to say, the isolation cover plate 3 is located on the side of the second moving contact assembly 42 away from the drive mechanism 1. An observation hole 5 and a reference mark 6 are provided on the isolation cover plate 3, which can make the rotation angle of the second moving contact assembly 42 visible, so as to achieve the effect of observing the position of the second moving contact assembly 42 in real time, and further be able to judge the engagement situation of the rotary disconnector according to the position of the second contact assembly 42. When preparing the isolation cover plate 3, a through hole can be opened in the isolation cover plate 3 as the observation hole 5. The observation hole 5 is used to observe the working condition inside the rotary disconnector from the outside of the rotary disconnector. Through the observation hole 5, the second moving contact assembly 42 adjacent to the isolation cover plate 3 can be observed. Specifically, when setting the reference mark 6, the reference mark 6 can be located on the periphery of the observation hole 5, and the perpendicular projections of the observation hole 5 and the second moving contact assembly 42 along the first direction M partially overlap, so that the rotation of the second moving contact assembly 42 can be seen through the observation hole 5. A pointer 7 is provided on the side of the second moving contact assembly 42 facing the isolation cover plate 3. The pointer 7 is perpendicular to the axis A, and the extension line of the pointer 7 passes through the axis A. The pointer 7 can be installed on the surface of the second moving contact assembly 42 facing the isolation cover plate 3, or can be embedded in the side of the second moving contact assembly 42 facing the isolation cover plate 3. The rotation of the second moving contact assembly 42 around the axis A is realized based on the alignment of the pointer 7 with the reference mark 6. When the drive mechanism 1 drives the first moving contact assembly 41 to rotate, with the step-by-step transmission of the plurality of moving contact assemblies 4 between the first moving contact assembly 41 and the second moving contact assembly 42, the pointer 7 rotates relative to the reference mark 6 along with the second moving contact assembly 42. When the pointer 7 points to the reference mark 6, all the switch units 2 are in the engaged state. When the pointer 7 deviates from the reference mark 6, there is a situation of under-engagement or over-engagement in the switch unit 2. In the case of under-engagement and over-engagement, the moving contact 43 does not contact the static contact 24.

[0039] The above rotary disconnector further includes an isolation piece 8 covering the observation hole 5. The isolation piece 8 is made of a transparent insulating material. The isolation piece 8 seals the isolation cover plate 3 and improves the insulation performance of the isolation cover plate 3.

[0040] Figure 6 is the front view of the rotary disconnector in an embodiment of the present application. Combining Figure 5 and Figure 6 , in one embodiment, the above reference mark 6 can be a fan ring, the center of the fan ring is located on the axis A, and the central angle of the fan ring is α. When the contact portion 431 contacts the first surface 241, the perpendicular projection of the pointer 7 along the first direction M points to any position in the area where the fan ring is located. At this time, all the switch units 2 where the moving contact assemblies 4 are located are in the engaged state.

[0041] Figure 7 Schematic diagram of the isolation cover plate in an embodiment of the present application. In combination with Figure 5 and Figure 7 , in another embodiment, the above reference numeral 6 may also be an arc, the reference numeral 6 is arranged on the isolation sheet 8, the central angle of the arc is α, and a plurality of reference points may be arranged on the arc. When the contact portion 431 contacts the first surface 241, the vertical projection of the pointer 7 along the first direction M points to any position in the area where the arc is located. At this time, all the switch units 2 where the moving contact assemblies 4 are located are in the engaged state.

[0042] The central angle α of the above reference numeral is equal to the central angle β of the arc where the sliding track of the contact portion 431 along the first surface 241 is located. The central angle β is in the first angle range.

[0043] Such as Figure 2 or Figure 6 , the shape of the above observation hole 5 can be various shapes. In a specific embodiment, the above observation hole 5 can be a circular hole, located at the center of the isolation cover plate 3, and the observation hole 5 is coaxially arranged with the moving contact assembly 4.

[0044] In another specific embodiment, the above observation hole 5 can be an annular hole (not shown in the figure), located at the center of the isolation cover plate 3, and the observation hole 5 is coaxially arranged with the moving contact assembly 4.

[0045] Such as Figure 7 , in yet another specific embodiment, the above observation hole 5 can be a waist-shaped hole or an oval hole, and can be located on the circumferential side of the center of the isolation cover plate 3, for example, at the three o'clock or nine o'clock direction of the longitudinal section of the isolation cover plate 3.

[0046] When the observation hole is in the position in the above-mentioned some embodiments, the working condition inside the rotary disconnector can be monitored more clearly through the observation hole 5. When adjusting the second moving contact assembly 42, the rotation track of the above pointer 7 can be seen from the observation hole 5 in any of the above embodiments.

[0047] Figure 8 Another perspective structural schematic diagram of the rotary disconnector in an embodiment of the present application. As Figure 8 shown, in one embodiment, the above driving mechanism 1 includes an operating member 11 and a core shaft 12. The extending direction of the core shaft 12 is the first direction M, the operating member 11 is installed at one end of the core shaft 12, and the first moving contact assembly (not shown in the figure) is installed at the other end of the core shaft 12. By screwing the operating member 11, the core shaft 12 can be driven to rotate around the axis A, so that the above-mentioned plurality of moving contact assemblies 4 also rotate around the axis A. The above operating member 11 can be a knob, a handle or other operating elements.

[0048] In a specific embodiment, the movable contact assembly 4 includes a connection mechanism 44. The connection mechanism 44 includes a first housing 441 and a second housing 442. The first housing 441 and the second housing 442 are snap-connected to form a receiving cavity, and the movable contact 43 is fixedly installed in the receiving cavity. When preparing the first housing 441 and the second housing 442, an installation groove can be provided on the surface of the first housing 441 or the second housing 442 facing the receiving cavity, and the movable contact 43 is installed in the installation groove.

[0049] The connection mechanisms of every two adjacent movable contact assemblies are inserted into each other to form a transmission shaft, and the driving mechanism drives the transmission shaft to rotate so as to rotate the movable contact.

[0050] The specific structure of the connection mechanism 44 will be described below.

[0051] In one embodiment, the surface of the first housing 441 facing away from the receiving cavity is a second surface 4411, and a slot 45 is provided in the middle of the second surface 4411. The surface of the second housing 442 facing away from the receiving cavity is a third surface 4421, and a plug 46 is provided in the middle of the third surface 4421. The slot 45 and the plug 46 are adapted to each other. Two adjacent connection mechanisms 44 are connected by inserting the plug 46 into the slot 45.

[0052] The cross-section of the plug can be square, triangular, rectangular, etc. The cross-section adopts a polygon, and the polygon has corners, so that edges for transmission can be formed, improving the transmission effect of the plug.

[0053] Figure 9 It is a schematic structural diagram of the connection between the first housing and the second housing of two adjacent connection mechanisms in an embodiment of the present application. As Figure 9 shown, in another embodiment, the surface of the first housing 441 facing away from the receiving cavity is a second surface 4411, and three plugs 46 are provided on the second surface 4411. The plugs 46 are located on the circumference of the axis A of the first housing 441. Correspondingly, the surface of the second housing 442 facing away from the receiving cavity is a third surface 4421, and three slots 45 adapted to the plugs 46 are provided on the third surface 4421. The slots 45 are located on the circumference of the axis A of the second housing 442. The three slots 45 are inserted into the plugs 46, improving the connection reliability of two adjacent connection mechanisms 44.

[0054] Please continue to refer to Figure 4 , the second housing 442 of the second movable contact assembly 42 is located between the first housing 441 and the isolation cover plate 3, and the pointer 7 is provided on the surface of the second housing 442 facing the isolation cover plate 3.

[0055] Please continue to refer to Figure 2, in a specific embodiment, the above-mentioned rotary disconnector includes 12 switch units 2, a sector ring is used as a reference mark 6, and the central angle α of the sector ring is 7°. When the driving mechanism 1 drives the moving contact assembly 4 to rotate around the axis A and the pointer 7 points to the sector ring area, the moving contact 43 of the second contact assembly 42 contacts the static contact 24. At this time, all the switch units 2 of the rotary disconnector are in the engaged state.

[0056] Figure 10 Schematic diagram of the structure of the power converter in an embodiment of the present application. As Figure 10 shown, on the other hand, the embodiment of the present application also provides a power converter, which includes the rotary disconnector 100, the power conversion circuit 200 and the housing 300 in any of the above embodiments. Among them, the rotary disconnector 100 is fixedly installed on the housing 300, and the power conversion circuit 200 is installed inside the housing 300. The rotary disconnector 100 is used to connect to the DC source 400 and the power conversion circuit 200. Specifically, the above-mentioned DC source 400 may include a plurality of photovoltaic panel strings connected in parallel (not shown in the figure), and each photovoltaic panel string is connected to the switch unit 2 of the corresponding rotary disconnector 100; or, the DC source 400 may include a plurality of battery clusters connected in parallel (not shown in the figure), and each battery cluster is connected to the switch unit 2 of the corresponding rotary disconnector 100. When the rotary disconnector 100 is closed, the DC source 400 supplies power to the power converter; when the rotary disconnector 100 is opened, the DC source 400 stops supplying power to the power converter. The photovoltaic panel string or the battery cluster is connected to the switch unit 2 of the above-mentioned rotary disconnector. Due to the observation hole 5 and the reference mark 6 of the above-mentioned rotary disconnector 100, the rotation angle of the second moving contact assembly 42 can be visualized, so as to achieve the effect of observing the position of the second contact assembly 42 in real time, and then the engagement situation of the rotary disconnector 100 can be judged according to the position of the second contact assembly 42. The working condition of the rotary disconnector 100 can be observed, and the user can adjust the driving component 2 in time according to the observation situation so that each switch unit 2 is in the engaged state, improving the reliability of the operation of the power converter.

[0057] It should be noted that, to achieve the above visualization, an image acquisition device can be used to collect the relative position image of the pointer 7 and the reference mark 6, and observe it after output. Or, the user directly observes it with the naked eye.

[0058] The terms used in the following embodiments are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the", "above-mentioned", "said", and "this" are also intended to include, for example, the expression "one or more", unless the context clearly indicates otherwise.

[0059] Reference to "an embodiment" or "a specific embodiment" described in this specification means that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. The terms "comprising", "including", "having", and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

Claims

1. A power converter, characterized in that, The invention comprises a rotary isolating switch, a power conversion circuit and a housing, wherein the rotary isolating switch is fixed to the housing, the power conversion circuit is located inside the housing, the rotary isolating switch is used to connect to the photovoltaic module and the power conversion circuit, when the rotary isolating switch is closed, the photovoltaic module supplies power to the power converter, and when the rotary isolating switch is opened, the photovoltaic module stops supplying power to the power converter; The rotary isolating switch comprises a driving mechanism and a plurality of switch units, wherein the driving mechanism and the plurality of switch units are sequentially arranged and installed along a first direction, and each of the switch units comprises a moving contact assembly; The switch unit adjacent to the driving mechanism is a first switch unit, the movable contact assembly in the first switch unit is a first movable contact assembly, the driving mechanism is connected to the first movable contact assembly to apply a rotational force to the first movable contact assembly, and two adjacent movable contact assemblies are plugged into each other to sequentially transmit the rotational force, so that the driving mechanism drives the movable contact assemblies of the plurality of switch units to rotate around an axis respectively, and the direction of the axis is the same as the first direction; The switch unit farthest from the driving mechanism is the second switch unit, the moving contact assembly in the second switch unit is the second moving contact assembly, the second switch unit also includes an isolation cover, the isolation cover is located on the side of the second moving contact assembly away from the driving mechanism, the isolation cover includes an observation hole and a reference mark, the observation hole and the second moving contact assembly respectively overlap in their vertical projections along the first direction, and the observation hole is used to observe the position of the second moving contact relative to the reference mark from outside the rotary isolating switch.

2. The power converter according to claim 1, wherein The reference mark is arranged on the periphery of the observation hole.

3. The power converter according to claim 1, characterized in that, The rotary isolating switch further includes an isolation sheet covering the observation hole, and the isolation sheet is made of a transparent insulating material.

4. The power converter according to claim 3, wherein The reference mark is provided on the isolation sheet.

5. The power converter according to any one of claims 1-4, characterized in that, The observation hole is located at the center of the isolation cover plate, and the observation hole and the second moving contact are coaxially arranged.

6. The power converter according to any one of claims 1 to 4, wherein: A pointer is provided on a side of the second moving contact assembly facing the isolation cover, and the pointer is perpendicular to the axis.

7. The power converter according to claim 6, characterized in that, The second moving contact assembly includes a connecting mechanism and a moving contact. The connecting mechanism includes a first shell and a second shell. The first shell and the second shell are snap-fitted together to form an accommodating cavity. The moving contact is fixedly installed in the accommodating cavity.

8. The power converter according to claim 7, wherein, The second shell is located between the first shell and the isolation cover. The pointer is provided on a surface of the second shell facing the isolation cover. An extension line of the pointer passes through the axis.

9. The power converter according to claim 8, wherein: The switch unit further includes a static contact, which is installed on the peripheral side of the moving contact assembly, and the moving contact assembly includes a moving contact; when the driving mechanism drives the moving contact assembly to rotate, the moving contact in the moving contact assembly and the static contact contact or separate from each other.

10. The power converter according to claim 9, wherein: The stationary contact includes a first surface, and the movable contact includes a contact portion. When the contact portion and the first surface are in contact with each other, the switch unit is in a conducting state.

11. The power converter according to claim 10, wherein, The reference mark is a sector ring, and the center of the sector ring is located on the axis; when the contact part of the second moving contact assembly contacts the first surface, the vertical projection of the pointer in the first direction points to the sector ring.

12. The power converter according to claim 11, wherein: When the second moving contact assembly rotates around the axis within a first angular range, the contact part of the second moving contact assembly remains in contact with the first surface.

13. The power converter according to claim 12, wherein: The first angular range is equal to the central angle of the sector ring.

14. The power converter according to claim 13, wherein The central angle of the sector ring is 7°.

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