Integrated isolating switch suitable for large-current distribution box

Abstract

The invention relates to the technical field of distribution box disconnecting switches, and discloses an integrated disconnecting switch suitable for a large-current distribution box, a static contact located above an isolation chamber is arranged on a long-arc-shaped upper conducting strip, a static contact located below the isolation chamber is arranged on a short-arc-shaped lower conducting strip, the length of the upper conducting strip is larger than that of the lower conducting strip, and the length of the upper conducting strip is larger than that of the lower conducting strip. When the split shaft section drives the moving contact to rotate and break, the lower moving contact is separated from the static contact on the lower conducting strip preferentially; an isolation plate is arranged in each isolation chamber, the split shaft section is attached to one end of the isolation plate to rotate, the isolation chamber is divided into a sealing cavity and an arc extinguishing cavity by the isolation plate, and an arc extinguishing mechanism is arranged in the arc extinguishing cavity. The problems that contact asynchronous abrasion and arc extinguishing difficulty are large due to bilateral arcs of an existing disconnecting switch, open type layout of conductive parts is prone to dust erosion and poor in heat dissipation, bilateral arc extinguishing mechanisms are high in cost and bloated in layout, fault positioning is difficult, and arc extinguishing reliability is low during large-current high-frequency operation are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of distribution box isolation switch, in particular to an integrated isolation switch suitable for large-current distribution box. BACKGROUND

[0002] With the development of new power systems, the performance requirements of large-current distribution box isolation switches in the field of new energy such as photovoltaic are increasingly stringent. Not only do they need to adapt to high-frequency operation scenarios, but they also need to consider compactness, reliability and cost-effectiveness. The existing integrated isolation switches on the market still have the following technical problems to be solved in the application process: Firstly, the upper and lower conductive sheets of the existing isolation switch are designed with equal length, and the moving contact and the upper and lower static contacts are disconnected synchronously, which causes arc to occur on both sides during disconnection. The arc on both sides not only causes asynchronous wear of the upper and lower contacts, but also makes it difficult to concentrate the arc, increasing the difficulty of arc extinction. Especially in the large-current scenario, residual arc is easy to cause contact ablation, shortening the service life of the equipment. At the same time, the double effects of arc erosion and mechanical wear on the double contacts cannot be targeted to select a special material suitable for a single loss type, limiting the optimization of contact performance.

[0003] Secondly, the internal conductive components of the existing isolation switch are mostly open layout, lacking effective isolation and protection structure. During long-term operation of the distribution box, dust and impurities are easy to accumulate on the top. After these pollutants fall on the surface of the conductive components, they will exacerbate the poor contact of the contacts, increase the contact resistance, and cause local overheating when large current passes through. Not only does it affect the stability of conduction, but it may also cause safety hazards. The open structure is not conducive to the concentrated dissipation of heat, and heat accumulation is easy to occur in sealed distribution boxes, further affecting the reliability of equipment operation.

[0004] Thirdly, to deal with the problem of bilateral arc, the existing technology mostly adopts a double-sided arc extinguishing mechanism design, which not only increases the structural complexity and manufacturing cost of the equipment, but also causes the internal layout of the isolation chamber to be bloated, making it difficult to meet the installation requirements of small and compact distribution boxes. At the same time, the dispersion of bilateral arc makes it difficult to detect fault arc, and it is difficult to accurately locate the fault position, which brings inconvenience to operation and maintenance, especially not suitable for scenes such as photovoltaic systems that require high operation and maintenance efficiency.

[0005] Finally, when the existing isolation switch adapts to large-current high-frequency operation, arc control is often poor, causing arc extinction to fail, and the continuous burning of arc can cause the pressure in the arc-extinguishing chamber to rise suddenly, which may cause safety risks such as cabinet damage. The design of synchronous disconnection on both sides causes the dispersion of arc energy, making it difficult for the arc-extinguishing mechanism to work efficiently, further reducing the reliability of large-current disconnection, and failing to meet the high-performance requirements of new power systems for isolation switches.

[0006] In summary, there is an urgent need for an integrated isolation switch suitable for a large current distribution box, which can realize arc centralized control, optimize contact wear, simplify structure layout and improve protection performance, to solve the above problems existing in the prior art. SUMMARY

[0007] (I) Technical problems solved In view of the shortcomings of the prior art, the present application provides an integrated isolation switch suitable for a large current distribution box, which has the advantages of realizing arc centralized control, contact material targeted adaptation, conductive component isolation protection, compact structure and precise fault positioning, and adapting to photovoltaic high-frequency operation requirements, solving the problems of contact asynchronous wear and difficult arc extinction caused by double-sided arc of the existing isolation switch, open layout of conductive components vulnerable to dust erosion and poor heat dissipation, high cost and bulky layout of double-sided arc extinction mechanism, and low arc extinction reliability during high-frequency operation of large current.

[0008] (II) Technical solutions To achieve the above purpose, the present application provides the following technical solutions: An integrated isolation switch suitable for a large current distribution box, comprising a shell and a rotating handle, the shell comprising a plurality of transversely arranged isolation chambers, the rotating handle being in transmission connection with a main shaft, the main shaft transversely penetrating through each isolation chamber, each isolation chamber having a static contact arranged on its upper and lower sides, the main shaft forming a sub-shaft section in the corresponding area of the isolation chamber, each sub-shaft section having a dynamic contact arranged on both sides, the static contact above the isolation chamber being arranged on a long arc-shaped upper conductive sheet, and the static contact below the isolation chamber being arranged on a short arc-shaped lower conductive sheet, the length of the upper conductive sheet being greater than the length of the lower conductive sheet, so that when the sub-shaft section drives the dynamic contact to rotate and break, the lower dynamic contact separates from the static contact on the lower conductive sheet first, and the upper dynamic contact separates from the static contact on the upper conductive sheet later; each isolation chamber has an isolation plate arranged therein, the sub-shaft section being rotatable on one end of the isolation plate, the isolation plate dividing the isolation chamber into a sealed cavity and an arc extinction cavity, the upper conductive sheet and the dynamic contact corresponding thereto being located in the sealed cavity, and the lower conductive sheet and the dynamic contact corresponding thereto being located in the arc extinction cavity, the arc extinction cavity having an arc extinction mechanism arranged therein.

[0009] Preferably, the arc extinction mechanism comprises an arc extinction grid, and the arc extinction grid is provided with an arc detection sensing unit.

[0010] Preferably, the upper conductive sheet is provided with a sliding sheet, the static contact is arranged on the sliding sheet, and the sliding sheet is slidingly connected to the upper conductive sheet near one side of the split shaft section; the sliding sheet is provided with a one-way locking mechanism and a reset mechanism; the one-way locking mechanism is used to lock the sliding sheet on the moving contact when the switch is fully closed, so that the sliding sheet slides upward to the end of the upper conductive sheet when the switch is opened, and the one-way locking mechanism is unlocked when the sliding sheet slides to the end of the upper conductive sheet, so that the sliding sheet is separated from the moving contact; the reset mechanism is used to push the sliding sheet to slide to the beginning of the upper conductive sheet after the sliding sheet is separated from the moving contact.

[0011] Preferably, the upper conductive sheet is rotatably connected in the isolation chamber, the rotation axis of the upper conductive sheet is arranged near the beginning of the upper conductive sheet, the end of the upper conductive sheet is provided with a elastic abutting mechanism, the elastic abutting mechanism provides an inward, i.e. toward the main shaft, elastic force for the upper conductive sheet, and the upper conductive sheet is further provided with a rotation limiting structure for limiting the angle of the inward rotation of the upper conductive sheet.

[0012] Preferably, the sliding sheet is provided in a C-shaped structure, the sliding sheet is composed of a C-shaped lower plate and a C-shaped upper plate, the C-shaped upper plate is provided in a wave-shaped elastic conductive sheet structure, the contact surface of the C-shaped upper plate that is attached to the moving contact is a continuous arc-shaped wave, the amplitude of the wave of the sliding sheet gradually decreases from the beginning to the end, the sliding sheet is integrally stamped from beryllium bronze, and the C-shaped upper plate is attached to the upper conductive sheet and slides therein.

[0013] Preferably, the main shaft is further provided with an energy storage mechanism, the mechanical energy generated by the rotation of the main shaft when the switch is closed is stored as elastic potential energy, and the elastic potential energy is released when the switch is opened, so as to quickly achieve the opening of the switch.

[0014] Preferably, the rotating handle is further provided with a locking mechanism, the locking mechanism is locked when the rotating handle is rotated to fully close or fully open, is manually unlocked when the switch needs to be opened or closed, or is automatically unlocked when an abnormality occurs, and the quick opening of the switch is completed under the action of the energy storage mechanism.

[0015] Preferably, the arc extinguishing mechanism further comprises an arc-shaped flow guide plate and a directional pressure relief channel; the opening of the arc extinguishing grid faces the moving contact, the grid sheet is made of copper-tungsten alloy, and the distance between the grid sheets gradually decreases from the opening end to the end; the arc-shaped flow guide plate is arranged on both sides of the arc extinguishing grid to guide the electric arc to converge to the center of the arc extinguishing grid; the directional pressure relief channel is arranged on the side wall of the arc extinguishing chamber away from the isolation plate, and a metal mesh arc filter and a one-way valve are arranged in the channel in sequence, and the one-way valve only allows the gas in the arc extinguishing chamber to be discharged outward.

[0016] Preferably, the one-way locking mechanism is arranged in the sliding piece, the C-shaped lower plate and the C-shaped upper plate are provided with through holes penetrated by a plurality of straight lines, the one-way locking mechanism comprises a sliding column slidingly arranged in the through hole, a sliding column spring is arranged between the C-shaped lower plate and the C-shaped upper plate, a boss is arranged on the outer side of the sliding column, the boss is fixedly connected with the sliding column spring, the sliding column spring provides the sliding column with an elastic force for sliding inward, that is, toward the side of the C-shaped lower plate, the end of the sliding column protrudes from the inner side of the C-shaped lower plate, the end of the sliding column is provided with an inclined chamfer toward one side, the inclined chamfer of the end of the sliding column is toward the side from which the moving contact comes when the switch is closed, and the end of the upper conductive sheet is provided with a magnetic attraction mechanism at a position corresponding to the sliding column.

[0017] Preferably, the inner wall of the sealed cavity is provided with a silica gel sealing gasket, the sealing gasket is attached to the gap between the isolation plate and the upper conductive sheet, the sliding fit position of the upper conductive sheet and the sliding piece is provided with a T-shaped sliding groove, the sliding piece is provided with a sliding block matched with the T-shaped sliding groove, and the T-shaped sliding groove is pre-coated with high-temperature conductive lubricating grease.

[0018] (Three) beneficial effects Compared with the prior art, the application provides an integrated isolation switch suitable for a large-current distribution box, which has the following beneficial effects: 1. The integrated isolation switch suitable for a large-current distribution box, by arranging the upper conductive sheet as a long arc, the lower conductive sheet as a short arc, and the length of the upper conductive sheet being greater than that of the lower conductive sheet, and by arranging an isolation plate to divide the isolation chamber into a sealed cavity and an arc-extinguishing cavity, firstly, the lower moving contact and the static contact on the lower conductive sheet are preferentially disconnected, and the upper moving contact and the static contact on the upper conductive sheet are disconnected later, so that the electric arc is generated only in the arc-extinguishing cavity, the asynchronous wear of the double-sided contacts is avoided, and the contacts on the two sides can be replaced with different materials resistant to electric arc and wear; secondly, the sealed cavity isolates and protects the upper conductive sheet and the corresponding static contact and moving contact, reduces the erosion of the upper conductive components by the dust falling from the top of the distribution box, and prolongs the service life of the contacts; and thirdly, the arc-extinguishing mechanism arranged on one side of the arc-extinguishing cavity realizes unilateral arc-extinguishing, reduces the cost of bilateral arc-extinguishing, and the unilateral arc-extinguishing can also facilitate positioning of the fault position through arc detection on the arc-extinguishing mechanism; finally, the concentrated control of the electric arc not only meets the high-frequency operation requirements of the photovoltaic system, but also makes the internal layout of the isolation chamber more compact.

[0019] 2. The integrated isolation switch suitable for a large-current distribution box, by arranging an arc detection sensing unit on the arc-extinguishing mechanism close to the source of the electric arc, the pure signal can be quickly captured, the fault arc can be accurately distinguished from the normal arc, the response is timely, the misjudgment rate is low, no additional space is occupied, and the integrated operation and maintenance are facilitated, thereby improving the safety and convenience of the switch operation.

[0020] 3、The integrated isolation switch suitable for high-current distribution box, by setting the slidable slide on the upper conductive sheet, and the slide is equipped with a one-way locking mechanism, the breaking time of the upper conductive sheet and the moving contact is prolonged when opening, and the communication time of the upper conductive sheet and the moving contact is consistent with the communication time of the lower conductive sheet and the moving contact through the reset mechanism when closing, firstly, the sliding slide can reduce the wear of the upper contact, and the protective effect of the sealing cavity is matched, which further prolongs the service life of the overall contact; secondly, the timing difference of the lower contact preferential breaking is further strengthened, which ensures that the arc is completely concentrated in the arc extinguishing chamber, avoids the residual arc on the upper side; and, the slide is quickly reset when closing, which reduces the wear of the upper conductive sheet and the slide when closing; finally, the slide is quickly reset when closing to ensure that the upper and lower contacts are connected synchronously, avoid uneven current distribution caused by the difference in communication time, ensure the stability of the switch current, and the automatic operation of the one-way locking and reset mechanism does not require additional operation, which takes into account the structural functionality and use convenience.

[0021] 4、The integrated isolation switch suitable for high-current distribution box, by rotating the upper conductive sheet in the isolation chamber, the rotating shaft is close to the initial end, the end is equipped with a elastic reset mechanism, and a rotating limiting structure is added, firstly, the inward elastic force of the elastic reset mechanism can press the slide and the moving contact in real time when opening, which ensures that the two are tightly attached and stably conductive, and avoids local overheating or residual arc caused by poor contact when large current passes; secondly, the rotating limiting structure accurately limits the inward rotation angle of the upper conductive sheet when closing, effectively avoids the collision interference between the moving contact and the upper conductive sheet, ensures smooth closing action, and maintains the normal communication timing of the upper and lower contacts; finally, the rotating design of the upper conductive sheet combined with the elastic compensation of the elastic reset mechanism can adapt to the movement track and slight wear of the moving contact, prolong the adaptation life of the upper conductive part, and the overall structure does not require additional operation, which takes into account the conductive reliability and mechanical operation stability.

[0022] 5、The integrated isolation switch suitable for high-current distribution box, by designing the slide as a wave-shaped elastic conductive sheet, firstly, the multi-point elastic attachment with the moving contact when opening is realized, the contact area is increased, the contact resistance is reduced, and local overheating when large current passes is avoided; unexpectedly, the elastic deformation of the wave-shaped structure can absorb the high-frequency vibration of the arc generated when opening, inhibit the bouncing phenomenon of the moving contact, further reduce the generation of residual arc, and the gradual design of the corrugated amplitude from the initial end to the end can guide the slide to slide smoothly along the upper conductive sheet, reduce the sliding friction loss, and cooperate with the elastic compensation of the elastic reset mechanism to make the wear of the slide uniform, prolong its service life. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure of the present application is shown in the figure.

[0024] Figure 2It is a structure schematic diagram of the inside of the isolation chamber of the application.

[0025] Figure 3 It is a structure schematic diagram of the split shaft section of the application.

[0026] Figure 4 It is a structure schematic diagram of the cooperation of the upper conductive sheet and the split shaft section of the application.

[0027] Figure 5 It is a structure schematic diagram of the upper conductive sheet of the application.

[0028] Figure 6 It is a sectional view of the upper conductive sheet of the application.

[0029] Figure 7 It is a structure schematic diagram of the arc extinguishing mechanism of the application.

[0030] In the figure: 1, housing; 11, isolation chamber; 111, static contact; 112, isolation plate; 101, sealing cavity; 102, arc extinguishing cavity; 2, rotating handle; 3, main shaft; 31, split shaft section; 311, moving contact; 4, upper conductive sheet; 41, sliding sheet; 42, one-way locking mechanism; 43, reset mechanism; 411, C-shaped lower plate; 412, C-shaped upper plate; 421, sliding column; 422, sliding column spring; 5, lower conductive sheet; 6, arc extinguishing mechanism; 61, arc extinguishing grid. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0032] In the description of the application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0033] In addition, fixed connection refers to the connection of parts or components after being fixed without any relative movement; transmission connection refers to a connection mode in which mechanical movement or torque is transmitted to other working components through a transmission member; sliding connection refers to a connection mode in which two objects are in contact but not fixed, and can slide relative to each other; and rotary connection refers to a connection mode in which two objects are in contact but not fixed, and can rotate relative to each other.

[0034] In addition, the terms "first", "second", "third", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or an ordered sequence. Thus, features defined with "first", "second" or "third" can include, explicitly or implicitly, one or more of such features. In the description of the application, the meaning of "a plurality" is two or more, unless otherwise expressly and specifically defined.

[0035] Embodiment one: The embodiment provides an integrated isolation switch suitable for a large-current distribution box, which has the following technical features.

[0036] Please refer to Figures 1-7 An integrated isolation switch suitable for a large-current distribution box, comprising a shell 1 and a rotating handle 2, the shell 1 comprises a plurality of transversely arranged isolation chambers 11, the rotating handle 2 is in transmission connection with a main shaft 3, the main shaft 3 transversely penetrates through each isolation chamber 11, a static contact 111 is arranged on the upper and lower sides of each isolation chamber 11, the main shaft 3 forms a sub-shaft section 31 in the corresponding area of the isolation chamber 11, a dynamic contact 311 is arranged on both sides of each sub-shaft section 31, the static contact 111 located above the isolation chamber 11 is arranged on a long-arc-shaped upper conductive sheet 4, and the static contact 111 located below the isolation chamber 11 is arranged on a short-arc-shaped lower conductive sheet 5, the length of the upper conductive sheet 4 is greater than that of the lower conductive sheet 5, so that when the sub-shaft section 31 drives the dynamic contact 311 to rotate and break, the lower dynamic contact 311 is separated from the static contact 111 on the lower conductive sheet 5 first, and the upper dynamic contact 311 is separated from the static contact 111 on the upper conductive sheet 4 later; an isolation plate 112 is arranged in each isolation chamber 11, the sub-shaft section 31 is attached to one end of the isolation plate 112 and rotates, the isolation plate 112 divides the isolation chamber 11 into a sealed cavity 101 and an arc-extinguishing cavity 102, the upper conductive sheet 4 and the dynamic contact 311 corresponding thereto are located in the sealed cavity 101, and the lower conductive sheet 5 and the dynamic contact 311 corresponding thereto are located in the arc-extinguishing cavity 102, and an arc-extinguishing mechanism 6 is arranged in the arc-extinguishing cavity 102.

[0037] It should be noted that the main shaft 3 is composed of a plurality of sub-shaft sections 31, and adjacent two sub-shaft sections 31 are fixed through the form of clamping grooves and clamping keys.

[0038] Further, the transmission mechanism between the rotating handle 2 and the main shaft 3 is a bevel gear meshing mechanism, the bevel gear meshing mechanism comprises a driving bevel gear fixed to the end of the rotating handle 2 and a driven bevel gear fixed to one end of the main shaft 3, the transmission ratio of the driving bevel gear and the driven bevel gear is 1:2, and the tooth surface of the driving bevel gear is provided with a spiral oil groove, and the oil groove is pre-coated with high-temperature lubricating grease.

[0039] It should be noted that the lateral rotation of the rotating handle 2 is converted into the longitudinal rotation of the main shaft 3 through the bevel gear meshing mechanism, and the transmission ratio is designed to make the closing / opening operation more labor-saving.

[0040] In an optional embodiment, the arc extinguishing mechanism 6 comprises an arc extinguishing grid 61, and an arc detection sensing unit is arranged on the arc extinguishing grid 61.

[0041] In an optional embodiment, the upper conducting sheet 4 is provided with a sliding sheet 41, the stationary contact 111 is arranged on the sliding sheet 41, and the sliding sheet 41 is slidingly connected to one side of the upper conducting sheet 4 close to the split shaft segment 31; the sliding sheet 41 is provided with a one-way locking mechanism 42 and a reset mechanism 43; the one-way locking mechanism 42 is used to lock the sliding sheet 41 on the moving contact 311 when the closing is completed, so that the sliding sheet 41 slides upward to the end of the upper conducting sheet 4 following the rotation of the moving contact 311 when the opening is performed, and the one-way locking mechanism 42 is unlocked when the sliding sheet 41 slides to the end of the upper conducting sheet 4, so that the sliding sheet 41 is separated from the moving contact 311; the reset mechanism 43 is used to push the sliding sheet 41 to slide to the beginning end of the upper conducting sheet 4 after the sliding sheet 41 is separated from the moving contact 311.

[0042] In an optional embodiment, the upper conducting sheet 4 is rotationally connected in the isolation chamber 11, the rotation axis of the upper conducting sheet 4 is arranged at a position close to the beginning end of the upper conducting sheet 4, an elastic abutting mechanism is arranged at the end position of the upper conducting sheet 4, the elastic abutting mechanism provides an elastic force for the upper conducting sheet 4 to rotate inward, i.e., toward the main shaft 3, and a rotation limiting structure is further arranged on the upper conducting sheet 4, which is used to limit the angle of the inward rotation of the upper conducting sheet 4.

[0043] It should be noted that the elastic abutting mechanism provides an elastic force for the upper conducting sheet 4 to rotate inward when the opening is performed, so as to improve the adhesion of the sliding sheet 41 and the moving contact 311; when the closing is performed, the upper conducting sheet 4 rotates inward, and the rotation angle of the upper conducting sheet 4 is limited through the rotation limiting structure, so as to avoid the contact between the split shaft segment 31 and the upper conducting sheet 4 during the closing process.

[0044] Further, the elastic abutting mechanism is a butterfly spring, one end of the butterfly spring abuts against the end of the upper conducting sheet 4, the other end of the butterfly spring abuts against the inner wall of the isolation chamber 11, and the elastic force direction of the butterfly spring is consistent with the rotation direction of the upper conducting sheet 4.

[0045] Further, a self-lubricating bearing is arranged at the rotation connection position of the upper conducting sheet 4 and the isolation chamber 11, the outer ring of the self-lubricating bearing is fixed to the isolation chamber 11, and the inner ring of the self-lubricating bearing is in interference fit with the rotation axis of the upper conducting sheet 4.

[0046] It should be noted that by adopting a combination structure of self-lubricating bearing and butterfly spring, smooth rotation and stable elastic clamping of the upper conductive plate 4 are first achieved, reducing mechanical wear. Unexpectedly, the non-linear elastic force characteristics of the butterfly spring can adapt to different wear stages of the moving contact 311. It provides moderate elastic force in the early stage of wear and automatically increases the elastic force in the later stage of wear, always maintaining effective contact pressure. At the same time, the self-lubricating bearing can reduce rotational resistance, reduce the operating torque of the rotating handle 2, and improve the ease of operation.

[0047] Furthermore, the rotation limiting structure is a limiting post fixed inside the housing 1, which is used to limit the angle of inward rotation of the upper conductive sheet 4.

[0048] In an optional embodiment, the slider 41 is configured as a C-shaped structure, consisting of a C-shaped lower plate 411 and a C-shaped upper plate 412. The C-shaped upper plate 412 is configured as a wave-shaped elastic conductive sheet structure. The contact surface between the C-shaped upper plate 412 and the moving contact 311 is a continuous arc-shaped wave, and the wave amplitude of the slider 41 gradually decreases from the beginning to the end. The slider 41 is integrally stamped from beryllium bronze material, and the C-shaped upper plate 412 slides within the upper conductive sheet 4.

[0049] Furthermore, the reset mechanism 43 is an arc spring, used to push the slider 41, which has slid to the end, to the beginning of the upper conductive plate 4.

[0050] In an optional embodiment, the main shaft 3 is also provided with an energy storage mechanism to store the mechanical energy generated by the rotation of the main shaft 3 when it is closed as elastic potential energy, and release the elastic potential energy when it is opened to quickly realize the opening.

[0051] Specifically, the energy storage mechanism includes a torsion spring and a positioning sleeve mounted on the main shaft 3. The positioning sleeve is fixedly connected to the housing 1. One end of the torsion spring is engaged in the slot of the positioning sleeve, and the other end is fixed to the protrusion on the main shaft 3. When the circuit is closed, the main shaft 3 rotates, causing the protrusion to torsion the torsion spring, so that the torsion spring stores elastic potential energy. When the circuit is opened, the torsion spring releases the elastic potential energy to drive the main shaft 3 to rotate rapidly.

[0052] In an optional embodiment, the rotary handle 2 is also provided with a locking mechanism, which locks when the rotary handle 2 is rotated to fully closed and fully open, and unlocks manually when it is necessary to open or close, or automatically unlocks when an abnormality occurs, and completes rapid opening under the action of the energy storage mechanism.

[0053] Specifically, the locking mechanism includes a locking pin located on the side wall of the rotary handle 2, an electromagnet that drives the locking pin to extend and retract, and two locking holes fixed on the housing 1, corresponding to the fully closed and fully open positions respectively. The electromagnet is electrically connected to the arc detection sensor unit. Under normal conditions, the electromagnet is energized to attract the locking pin and insert it into the locking hole to achieve locking. In case of an abnormality, the arc detection sensor unit sends a signal to cut off the power supply to the electromagnet, and the locking pin disengages from the locking hole under the action of the return spring. The energy storage mechanism releases potential energy to drive the main shaft 3 to quickly open the circuit. During manual operation, pressing the unlock button on the rotary handle 2 will cut off the power supply to the electromagnet and achieve unlocking.

[0054] In an optional embodiment, the arc-extinguishing mechanism 6 further includes an arc-shaped guide plate and a directional pressure relief channel; the opening of the arc-extinguishing grid 61 faces the moving contact 311, the grid plates are made of copper-tungsten alloy, and the grid plate spacing gradually decreases from the opening end to the end end; the arc-shaped guide plate is located on both sides of the arc-extinguishing grid 61, guiding the arc to converge towards the center of the arc-extinguishing grid 61; the directional pressure relief channel is opened on the side wall of the arc-extinguishing chamber 102 away from the isolation plate 112, and a metal mesh arc filter and a one-way valve are sequentially arranged in the channel, the one-way valve only allows the gas in the arc-extinguishing chamber 102 to be discharged outward.

[0055] In an optional embodiment, a one-way locking mechanism 42 is disposed within a slide plate 41. A plurality of through holes are provided on the C-shaped lower plate 411 and the C-shaped upper plate 412. The one-way locking mechanism 42 includes a slide post 421 slidably disposed within the through holes. A slide post spring 422 is disposed between the C-shaped lower plate 411 and the C-shaped upper plate 412. A boss is provided on the outer side of the slide post 421. The boss is fixedly connected to the slide post spring 422. The slide post spring 422 provides elastic force for the slide post 421 to slide inward, i.e. towards the side of the C-shaped lower plate 411. The end of the slide post 421 protrudes from the inner side of the C-shaped lower plate 411. The end of the slide post 421 is provided with an inclined chamfer facing one side. The inclined chamfer at the end of the slide post 421 faces the side from which the moving contact 311 comes when the circuit is closed. A magnetic attraction mechanism is provided at the end of the upper conductive plate 4 at the position corresponding to the slide post 421.

[0056] It should be noted that when closing, as the moving contact 311 passes the end of the sliding column 421, the inclined chamfer at the end of the sliding column 421 pushes the sliding column 421 outward, thus allowing the moving contact 311 to pass smoothly through the sliding column 421. When opening, under the action of the sliding column spring 422, the moving contact 311, along with the sliding plate 41, rotates. When the sliding plate 41 slides to the end of the upper conductive plate 4, the sliding column 421 is attracted by the magnetic attraction mechanism, causing the sliding column 421 to slide outward, thus disengaging the sliding plate 41 from the moving contact 311.

[0057] In an optional embodiment, the inner wall of the sealing cavity 101 is provided with a silicone sealing gasket, which is attached to the gap between the isolation plate 112 and the upper conductive sheet 4; a T-shaped groove is provided at the sliding engagement point between the upper conductive sheet 4 and the slide plate 41, and a slider adapted to the T-shaped groove is provided on the slide plate 41, and high-temperature conductive grease is pre-coated in the T-shaped groove.

[0058] It should be noted that by adding a silicone sealing gasket and a T-shaped sliding groove structure, the IP54 protection level of the sealing cavity 101 is first achieved, effectively blocking the intrusion of dust and moisture. At the same time, the T-shaped structure ensures that the sliding plate 41 slides smoothly and does not fall off. Unexpectedly, the T-shaped sliding groove not only plays a guiding role, but its groove wall can also assist in heat dissipation, conducting the heat generated by the contact between the sliding plate 41 and the upper conductive plate 4 to the inner wall of the sealing cavity 101. Combined with the thermal conductivity of the grease, it avoids local overheating in the contact area and further extends the service life of the upper conductive component.

[0059] In summary, this integrated disconnecting switch suitable for high-current distribution boxes, by setting the upper conductive plate 4 as a long arc shape and the lower conductive plate 5 as a short arc shape, with the upper conductive plate 4 being longer than the lower conductive plate 5, and by dividing the isolation chamber 11 into a sealed cavity 101 and an arc-extinguishing cavity 102 through the isolation plate 112, firstly, achieves the priority separation of the lower moving contact 311 from the stationary contact 111 on the lower conductive plate 5, and subsequently separates the upper moving contact 311 from the stationary contact 111 on the upper conductive plate 4, so that the arc is concentrated only in the arc-extinguishing cavity 102, avoiding asynchronous wear of the contacts on both sides, and can separately disconnect the contacts on both sides. The materials used are replaced with materials that are resistant to arcing and wear. Secondly, the sealing cavity 101 isolates and protects the upper conductive sheet 4 and the corresponding stationary contact 111 and moving contact 311, reducing the erosion of the upper conductive components by dust falling from the top of the distribution box and extending the service life of the contacts. Furthermore, an arc extinguishing mechanism 6 is set on one side of the arc extinguishing cavity 102 to achieve single-sided arc extinguishing, reducing the cost of double-sided arc extinguishing. Single-sided arc extinguishing also allows for easy location of faults by detecting arcs on the arc extinguishing mechanism 6. Finally, centralized arc control not only meets the high-frequency operation requirements of photovoltaic systems but also makes the internal layout of the isolation chamber more compact.

[0060] This integrated disconnect switch, suitable for high-current distribution boxes, uses an arc detection sensing unit on the arc extinguishing mechanism 6 to quickly capture a clean signal close to the arc source, accurately distinguishing between faulty arcs and normal arcs. It responds promptly, has a low false alarm rate, requires no additional space, facilitates accurate fault location and integrated operation and maintenance, and improves the safety and convenience of switch operation.

[0061] This integrated disconnecting switch, suitable for high-current distribution boxes, utilizes a sliding contact 41 on the upper conductive plate 4, equipped with a one-way locking mechanism 42. This extends the breaking time between the upper conductive plate 4 and the moving contact 311 during opening, and ensures that the connection time between the upper conductive plate 4 and the moving contact 311 is consistent with that between the lower conductive plate 5 and the moving contact 311 during closing via a reset mechanism 43. Firstly, the sliding contact 41 reduces wear on the upper contact, and combined with the protective function of the sealing cavity 101, further extends the overall contact life. Lifespan; secondly, the timing difference of the lower contact's priority breakage is further enhanced to ensure that the arc is completely concentrated in the arc-extinguishing cavity 102, avoiding residual arc on the upper side; furthermore, the slider 41 quickly resets when closing, reducing wear on the upper conductive plate 4 and the slider 41 during closing; finally, the rapid reset of the slider 41 when closing ensures synchronous connection of the upper and lower contacts, avoiding uneven current distribution caused by differences in connection timing, ensuring the stability of the switch's current carrying capacity, while the automatic operation of the one-way locking and reset mechanism 43 requires no additional operation, balancing structural functionality and ease of use.

[0062] This integrated disconnecting switch, suitable for high-current distribution boxes, connects the upper conductive plate 4 to the isolation chamber 11 by rotation. Its rotation axis is positioned near the beginning, and the end is equipped with a spring-loaded mechanism and a rotation limit structure. First, during opening, the inward spring force of the spring-loaded mechanism can press the sliding plate 41 and the moving contact 311 in real time, ensuring a tight fit and stable conductive contact, preventing local overheating or residual arcing due to poor contact when a large current passes through. Second, during closing, the rotation limit structure precisely limits the inward rotation angle of the upper conductive plate 4, effectively avoiding collision interference between the moving contact 311 and the upper conductive plate 4, ensuring smooth closing action, and maintaining the normal connection sequence of the upper and lower contacts. Finally, the rotational design of the upper conductive plate 4 combined with the elastic compensation of the spring-loaded mechanism can adapt to the movement trajectory and slight wear of the moving contact 311, extending the service life of the upper conductive components. Furthermore, the overall structure requires no additional operation, balancing conductive reliability and mechanical operational stability.

[0063] This integrated disconnect switch, suitable for high-current distribution boxes, achieves multi-point elastic contact between the slider 41 and the moving contact 311 during opening by designing the slider 41 as a wave-shaped elastic conductive sheet. This increases the conductive contact area, reduces contact resistance, and avoids local overheating when a large current passes through. Unexpectedly, the elastic deformation of the wave-shaped structure can absorb the high-frequency vibration generated by the arc during opening, suppressing the bouncing phenomenon of the moving contact 311 and further reducing the generation of residual arc. At the same time, the gradual change in the wave amplitude from the beginning to the end can guide the slider 41 to slide smoothly along the upper conductive sheet 4, reducing sliding friction loss. Combined with the elastic compensation of the spring-loaded mechanism, the wear of the slider 41 is made uniform, extending its service life.

[0064] As a further improvement, a dust cover is added to the outside of the one-way valve in the directional pressure relief channel.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated disconnect switch suitable for high-current distribution boxes, comprising a housing (1) and a rotary handle (2), wherein the housing (1) includes a plurality of transversely arranged isolation chambers (11), the rotary handle (2) is connected to a main shaft (3) for transmission, the main shaft (3) passes transversely through each isolation chamber (11), and each isolation chamber (11) is provided with stationary contacts (111) on its upper and lower sides respectively, the main shaft (3) forms a sub-shaft segment (31) in the corresponding area of ​​the isolation chamber (11), and each sub-shaft segment (31) is provided with moving contacts (311) on both sides, characterized in that: The stationary contact (111) located above the isolation chamber (11) is set on the long arc-shaped upper conductive plate (4), and the stationary contact (111) located below the isolation chamber (11) is set on the short arc-shaped lower conductive plate (5). The length of the upper conductive plate (4) is greater than the length of the lower conductive plate (5). When the split shaft segment (31) drives the moving contact (311) to rotate and break, the lower moving contact (311) and the stationary contact (111) on the lower conductive plate (5) are separated first. Each isolation chamber (11) is equipped with an isolation plate (112). The split shaft section (31) is attached to one end of the isolation plate (112) and rotates. The isolation plate (112) divides the isolation chamber (11) into a sealed cavity (101) and an arc-extinguishing cavity (102). The upper conductive plate (4) and its corresponding moving contact (311) are located in the sealed cavity (101), and the lower conductive plate (5) and its corresponding moving contact (311) are located in the arc-extinguishing cavity (102). An arc-extinguishing mechanism (6) is provided in the arc-extinguishing cavity (102).

2. The integrated disconnecting switch suitable for high-current distribution boxes according to claim 1, characterized in that, The arc extinguishing mechanism (6) includes an arc extinguishing grid (61), on which an arc detection sensing unit is provided.

3. An integrated disconnecting switch suitable for high-current distribution boxes according to claim 2, characterized in that, A slider (41) is provided on the upper conductive sheet (4), and a stationary contact (111) is provided on the slider (41). The slider (41) is slidably connected to the side of the upper conductive sheet (4) near the split shaft section (31). A one-way locking mechanism (42) and a reset mechanism (43) are provided on the slider (41). The one-way locking mechanism (42) is used to lock the slider (41) on the moving contact (311) when the circuit is fully closed, so that when the circuit is opened, the slider (41) slides to the end of the upper conductive plate (4) as the moving contact (311) rotates. When the slider (41) slides to the end of the upper conductive plate (4), the one-way locking mechanism (42) unlocks, so that the slider (41) disengages from the moving contact (311). The reset mechanism (43) is used to push the slider (41) to slide to the beginning of the upper conductive sheet (4) after the slider (41) is disengaged from the moving contact (311).

4. An integrated disconnecting switch suitable for high-current distribution boxes according to claim 3, characterized in that, The upper conductive sheet (4) is rotatably connected inside the isolation chamber (11). The rotation axis of the upper conductive sheet (4) is located near the beginning of the upper conductive sheet (4). A spring-loaded mechanism is provided at the end of the upper conductive sheet (4). The spring-loaded mechanism provides the upper conductive sheet (4) with a spring force to rotate inward, that is, towards the main shaft (3). The upper conductive sheet (4) is also provided with a rotation limiting structure to limit the angle of inward rotation of the upper conductive sheet (4).

5. An integrated disconnecting switch suitable for high-current distribution boxes according to claim 4, characterized in that, The slider (41) is configured as a C-shaped structure. The slider (41) is composed of a C-shaped lower plate (411) and a C-shaped upper plate (412). The C-shaped upper plate (412) is configured as a wave-shaped elastic conductive sheet structure. The contact surface of the C-shaped upper plate (412) and the moving contact (311) is in continuous arc-shaped ripples. The ripple amplitude of the slider (41) gradually decreases from the beginning to the end. The slider (41) is integrally stamped from beryllium bronze material. The C-shaped upper plate (412) slides inside the upper conductive sheet (4).

6. An integrated disconnecting switch suitable for high-current distribution boxes according to claim 1, characterized in that, The main shaft (3) is also provided with an energy storage mechanism, which stores the mechanical energy generated by the rotation of the main shaft (3) when it is closed as elastic potential energy, and releases the elastic potential energy when it is opened, so as to quickly realize the opening.

7. An integrated disconnecting switch suitable for high-current distribution boxes according to claim 1, characterized in that, The rotary handle (2) is also equipped with a locking mechanism, which locks when the rotary handle (2) is rotated to fully closed and fully open, and unlocks manually when it is necessary to open or close, or automatically unlocks when an abnormality occurs, and completes rapid opening under the action of the energy storage mechanism.

8. An integrated disconnecting switch suitable for high-current distribution boxes according to claim 2, characterized in that, The arc extinguishing mechanism (6) also includes an arc-shaped guide plate and a directional pressure relief channel; the opening of the arc extinguishing grid (61) faces the moving contact (311), the grid plate is made of copper-tungsten alloy, and the grid plate spacing gradually decreases from the opening end to the end end; the arc-shaped guide plate is located on both sides of the arc extinguishing grid (61) to guide the electric arc to converge towards the center of the arc extinguishing grid (61); the directional pressure relief channel is opened on the side wall of the arc extinguishing chamber (102) away from the isolation plate (112), and a metal mesh arc filter and a one-way valve are arranged in sequence in the channel. The one-way valve only allows the gas in the arc extinguishing chamber (102) to be discharged outward.

9. An integrated disconnecting switch suitable for high-current distribution boxes according to claim 5, characterized in that, The one-way locking mechanism (42) is disposed within the slide plate (41). Multiple through holes with straight lines are provided on the C-shaped lower plate (411) and C-shaped upper plate (412). The one-way locking mechanism (42) includes a sliding column (421) slidably disposed within the through holes. A sliding column spring (422) is disposed between the C-shaped lower plate (411) and C-shaped upper plate (412). A boss is provided on the outer side of the sliding column (421), and the boss is fixedly connected to the sliding column spring (422). The column spring (422) provides the sliding column (421) with an elastic force that allows it to slide inward toward the side of the C-shaped lower plate (411). The end of the sliding column (421) protrudes from the inside of the C-shaped lower plate (411). The end of the sliding column (421) is provided with an inclined chamfer facing one side. The inclined chamfer at the end of the sliding column (421) faces the side from which the moving contact (311) comes when the circuit is closed. The end of the upper conductive plate (4) is provided with a magnetic attraction mechanism at the position corresponding to the sliding column (421).

10. An integrated disconnecting switch suitable for high-current distribution boxes according to claim 4, characterized in that, The inner wall of the sealed cavity (101) is provided with a silicone sealing gasket, which is attached to the gap between the isolation plate (112) and the upper conductive sheet (4); the upper conductive sheet (4) and the sliding plate (41) are provided with a T-shaped groove, and the sliding plate (41) is provided with a slider that is adapted to the T-shaped groove. The T-shaped groove is pre-coated with high-temperature conductive grease.

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