阅读说明：本技术 高压开关柜 (High-voltage switch cabinet ) 是由 姚飞 盛智会 关惠珊 李钊泉 林婉祯 于 2019-11-11 设计创作，主要内容包括：本发明属于电力开关柜技术领域,尤其涉及一种高压开关柜,高压开关柜包括：电气箱,内部形成有隔离室和电缆室,所述隔离室的一侧具有开口,所述电缆室对应所述隔离室设有开口的一侧设有下门；密封罩,穿设有隔离操作轴和接地操作轴；航空插头,设于所述密封罩上,以用于二次接线；联锁机构和指示板,所述联锁机构设于所述电气箱对应所述电缆室的一侧且与所述下门联动,所述指示板分别与所述隔离操作轴和接地操作轴连接并形成联动结构。将操作机构密封在封闭的密封罩内部,内部接线通过航空插头的形式引出,可以起到防水、防尘的作用,机柜具有良好的密封性能,同时实现了模块化安装,方便接线；开关柜符合五防联锁要求,符合安全操作规程。(The invention belongs to the technical field of power switch cabinets, and particularly relates to a high-voltage switch cabinet, which comprises: the electric box is internally provided with an isolation chamber and a cable chamber, one side of the isolation chamber is provided with an opening, and one side of the cable chamber, which corresponds to the isolation chamber and is provided with the opening, is provided with a lower door; the sealing cover is provided with an isolation operation shaft and a grounding operation shaft in a penetrating way; the aviation plug is arranged on the sealing cover and used for secondary wiring; the interlocking mechanism is arranged on one side, corresponding to the cable chamber, of the electric box and is in linkage with the lower door, and the indicating plate is connected with the isolation operating shaft and the grounding operating shaft respectively and forms a linkage structure. The operating mechanism is sealed in the sealed sealing cover, the internal wiring is led out in the form of an aviation plug, so that waterproof and dustproof effects can be achieved, the cabinet has good sealing performance, and meanwhile, modularized installation is realized, and wiring is convenient; the switch cabinet meets the five-prevention interlocking requirement and meets the safe operation regulation.)

1. A high tension switchgear which characterized in that: the method comprises the following steps:

the electric box is internally provided with an isolation chamber and a cable chamber, one side of the isolation chamber is provided with an opening, and one side of the cable chamber, which corresponds to the isolation chamber and is provided with the opening, is provided with a lower door;

the sealing cover is connected to the opening of the isolation chamber in a sealing mode, and an isolation operation shaft and a grounding operation shaft penetrate through the sealing cover;

the aviation plug is arranged on the sealing cover and used for secondary wiring;

interlocking device and indicator board, interlocking device locates the electric box corresponds one side of cable chamber and with the lower door linkage, the indicator board respectively with keep apart operating axis and ground connection operating axis and connect and form linkage structure, when keeping apart the operating axis and rotating to the isolation position, the indicator board shelters from the ground connection operating axis, interlocking device will the lower door lock in the electric box, the ground connection operating axis rotate extremely during the ground connection position, the indicator board shelters from the isolation operating axis, interlocking device loosens the lower door makes the lower door can be opened.

2. The high-voltage switchgear cabinet according to claim 1, characterized in that: the isolation operation shaft and the grounding operation shaft are respectively sleeved with a first sealing element and a second sealing element, the first sealing element and the second sealing element are respectively sleeved on the isolation operation shaft or the grounding operation shaft, the first sealing element and the second sealing element are respectively arranged on the isolation operation shaft or the grounding operation shaft in a sleeved mode, the sealing ring pressing plate is fixedly connected with the inner wall of the sealing cover and presses the sealing ring on the inner wall of the sealing cover, and therefore the isolation operation shaft or the grounding operation shaft penetrates through a gap at the sealing cover.

3. The high-voltage switchgear cabinet according to claim 1, characterized in that: sealing boot welded fastening in on the electric box, the electric box corresponds one side of cable chamber is connected with the extension shell, lower door movable mounting in on the extension shell, the top surface of extending the shell with the sealing boot welding just is formed with for the exposed installation department of sealing boot, interlocking device locates the installation department.

4. The high-voltage switchgear cabinet according to claim 3, characterized in that: the interlocking mechanism comprises an interlocking support, an interlocking plate and a push plate, the interlocking support is mounted on the mounting portion, the interlocking plate and the push plate are connected to the interlocking support in a sliding mode, and the interlocking plate drives the lower door to close when the push plate moves towards the inner side of the extension shell and is separated from the interlocking plate.

5. The high-voltage switchgear cabinet according to claim 4, characterized in that: the interlocking mechanism further comprises a return spring, two free ends of the return spring are respectively connected to the push plate and the interlocking plate, when the push plate moves towards the inner side of the extension shell and is separated from the interlocking plate, the interlocking plate moves downwards under the combined action of the gravity of the interlocking plate and the elastic force of the return spring, and therefore the lower door is driven to move downwards.

6. The high-voltage switchgear cabinet according to claim 4, characterized in that: the extension shell is close to one side of the lower door and is provided with a plurality of guide rail grooves, the periphery of the lower door is provided with a surrounding edge, the inner wall of the surrounding edge is provided with a plurality of limiting columns, and the interlocking plate drives the limiting columns to slide into the corresponding guide rail grooves when the lower door moves to a preset position, so that the lower door is closed.

7. The high-voltage switchgear cabinet according to claim 4, characterized in that: keep apart the epaxial cover of operation and have first transmission piece, the epaxial cover of ground connection operation has the second transmission piece, the indicator panel is fixed with the driving plate through the connecting plate, the driving plate is located the indicator panel with between the sealed cowling, the driving plate with the interval has between the indicator panel, the driving plate with first transmission piece and the linkage of second transmission piece, keep apart the operation axle and drive can drive when first transmission piece rotates the driving plate downstream, the ground connection operation axle drives can drive when the second transmission piece rotates the driving plate upward movement.

8. The high voltage switchgear of claim 7, wherein: the grounding operation shaft is sleeved with a cam, when the cam rotates to a grounding position along with the grounding operation shaft, the indicating plate shields the isolation operation shaft, the interlocking plate can move upwards, and the lower door can be opened; when the cam rotates to an isolation position along with the grounding operation shaft, the indicating plate shields the grounding operation shaft, the interlocking plate is propped against the cam, and the lower door cannot be opened.

9. The high voltage switchgear of claim 7, wherein: keep apart the operating axis and be located directly over the ground connection operating axis, the adaptation has been seted up to one side of driving plate keep apart the first location breach of operating axis, and the adaptation has been seted up to the opposite side the second location breach of ground connection operating axis, during the driving plate up-and-down motion keep apart the operating axis and follow first location breach slides, the ground connection operating axis is followed the second location breach slides.

10. The high voltage switchgear of claim 7, wherein: first driving plate with the second driving plate is the fan-shaped piece that has the breach, the one end of driving plate is formed with first limit of bending, and the other end is formed with the second limit of bending, first limit of bending stretches into in the breach of first driving plate, the second limit of bending stretches into in the breach of second driving plate, first driving plate passes through first limit of bending drives driving plate upward movement, the second driving plate passes through the second limit of bending drives the driving plate downstream.

Technical Field

The invention belongs to the technical field of power switch cabinets, and particularly relates to a high-voltage switch cabinet.

Background

High tension switchgear is the equipment that electric power distribution field commonly used, because high tension switchgear has higher voltage at the during operation, has very big potential safety hazard to operating personnel, consequently, improves high tension switchgear's security performance and is very important. Although some existing high-voltage switch cabinets have a five-prevention function, the protection level of the existing high-voltage switch cabinets is low, IP4X can only be achieved, and the sealing performance of the existing high-voltage switch cabinets cannot meet the use requirement easily.

Disclosure of Invention

The invention aims to provide a high-voltage switch cabinet, and aims to solve the technical problem that the high-voltage switch cabinet in the prior art is low in protection level.

In order to achieve the purpose, the invention adopts the technical scheme that: a high voltage switchgear comprising:

the electric box is internally provided with an isolation chamber and a cable chamber, one side of the isolation chamber is provided with an opening, and one side of the cable chamber, which corresponds to the isolation chamber and is provided with the opening, is provided with a lower door;

the sealing cover is connected to the opening of the isolation chamber in a sealing mode, and an isolation operation shaft and a grounding operation shaft penetrate through the sealing cover;

the aviation plug is arranged on the sealing cover and used for secondary wiring;

interlocking device and indicator board, interlocking device locates the electric box corresponds one side of cable chamber and with the lower door linkage, the indicator board respectively with keep apart operating axis and ground connection operating axis and connect and form linkage structure, when keeping apart the operating axis and rotating to the isolation position, the indicator board shelters from the ground connection operating axis, interlocking device will the lower door lock in the electric box, the ground connection operating axis rotate extremely during the ground connection position, the indicator board shelters from the isolation operating axis, interlocking device loosens the lower door makes the lower door can be opened.

Furthermore, a first sealing element and a second sealing element are sleeved on the isolation operation shaft and the grounding operation shaft respectively, the first sealing element and the second sealing element respectively comprise a sealing ring and a sealing ring pressing plate which are sleeved on the isolation operation shaft or the grounding operation shaft, the sealing ring pressing plate is connected and fixed with the inner wall of the sealing cover and presses the sealing ring on the inner wall of the sealing cover so as to seal a gap where the isolation operation shaft or the grounding operation shaft penetrates through the sealing cover.

Further, the sealed cowling welded fastening be in on the electric box, the electric box corresponds one side of cable chamber is connected with the extension shell, lower door movable mounting in on the extension shell, extend the top surface of shell with the sealed cowling welding just is formed with for the exposed installation department of sealed cowling, interlocking device locates the installation department.

Further, the interlocking mechanism comprises an interlocking support, an interlocking plate and a push plate, the interlocking support is mounted on the mounting portion, the interlocking plate and the push plate are connected to the interlocking support in a sliding mode, and the interlocking plate drives the lower door to close when the push plate moves towards the inner side of the extension shell to be separated from the interlocking plate.

Furthermore, the interlocking mechanism further comprises a return spring, two free ends of the return spring are respectively connected to the push plate and the interlocking plate, when the push plate moves towards the inner side of the extension shell and is separated from the interlocking plate, the interlocking plate moves downwards under the combined action of the gravity of the interlocking plate and the elastic force of the return spring, and therefore the lower door is driven to move downwards.

Furthermore, a plurality of guide rail grooves are formed in one side, close to the lower door, of the extension shell, surrounding edges are arranged on the periphery of the lower door, a plurality of limiting columns are arranged on the inner wall of the surrounding edges, and the interlocking plates drive the limiting columns to slide into the corresponding guide rail grooves when the lower door moves to a preset position, so that the lower door is closed.

Further, keep apart the epaxial cover of operation and have joined in marriage first transmission piece, the epaxial cover of ground connection operation has joined in second transmission piece, the indicator panel is fixed with the driving plate through the connecting plate, the driving plate is located the indicator panel with between the sealed cowling, the driving plate with the interval has between the indicator panel, the driving plate with first transmission piece and the linkage of second transmission piece, keep apart the operation axle and drive can drive when first transmission piece rotates the driving plate downstream, the ground connection operation axle drives can drive when the second transmission piece rotates the driving plate upward movement.

Furthermore, a cam is sleeved on the grounding operation shaft, when the cam rotates to a grounding position along with the grounding operation shaft, the indicating plate shields the isolation operation shaft, the interlocking plate can move upwards, and the lower door can be opened; when the cam rotates to an isolation position along with the grounding operation shaft, the indicating plate shields the grounding operation shaft, the interlocking plate is propped against the cam, and the lower door cannot be opened.

Furthermore, keep apart the operating axis and be located directly over the ground connection operating axis, the adaptation has been seted up to one side of driving plate keep apart the first location breach of operating axis, and the adaptation has been seted up to the opposite side the second location breach of ground connection operating axis, during the driving plate up-and-down motion the operation axis is kept apart along first location breach slides, the ground connection operating axis is followed the second location breach slides.

Further, first driving plate with the second driving plate is the fan-shaped piece that has the breach, the one end of driving plate is formed with first limit of bending, and the other end is formed with the second limit of bending, first limit of bending stretches into in the breach of first driving plate, the second limit of bending stretches into in the breach of second driving plate, first driving plate passes through first limit of bending drives driving plate upward movement, the second driving plate passes through the second limit of bending drives the driving plate downstream.

The invention has the beneficial effects that: according to the high-voltage switch cabinet, the operating mechanism is sealed in the sealed sealing cover, the internal wiring is led out in the form of the aviation plug, the waterproof and dustproof effects can be achieved, the cabinet protection grade can be improved to IP65, meanwhile, the modularized installation is realized, and the wiring is convenient; the indicator board is linked with the isolation operation shaft and the grounding operation shaft, and the interlocking mechanism is linked with the lower door, so that the interlocking operation among the isolation switch, the grounding switch and the cabinet door is realized, the misoperation is prevented, the safety of electric power people is ensured, the five-prevention interlocking requirement is met, the safety operation regulation is met, and the interlocking part is installed on the outer side of the cabinet, so that the installation and the maintenance are convenient.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic perspective view of a high-voltage switch cabinet according to an embodiment of the present invention;

FIG. 2 is a schematic side view of the high voltage switchgear of FIG. 1;

fig. 3 is an exploded view of the high-voltage switchgear cabinet shown in fig. 1;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic perspective view of the lower door of FIG. 1;

FIG. 6 is an exploded view of the cover plate on the enclosure of FIG. 1;

FIG. 7 is a first diagram illustrating a portion of the high voltage switchgear of FIG. 1;

fig. 8 is a schematic perspective view of an interlocking mechanism in the high voltage switch cabinet shown in fig. 1;

FIG. 9 is a schematic side view of the interlock mechanism of the high voltage switch cabinet of FIG. 1;

FIG. 10 is an exploded view of the interlock mechanism of the high voltage switchgear of FIG. 1;

fig. 11 is a schematic diagram of a partial structure of the high voltage switch cabinet shown in fig. 1;

fig. 12 is a partially enlarged schematic view one of the two rotating shafts of the high voltage switch cabinet shown in fig. 1 in the initial position;

fig. 13 is a second partially enlarged schematic view of the high voltage switch cabinet shown in fig. 1, wherein two rotating shafts are located at initial positions;

fig. 14 is a partially enlarged schematic view three of the high voltage switch cabinet shown in fig. 1, wherein two rotating shafts are located at initial positions;

fig. 15 is a partially enlarged first schematic view of the grounding operation shaft of the high voltage switch cabinet shown in fig. 1 rotated to a grounding position;

fig. 16 is a partially enlarged schematic view two of the grounding operation shaft of the high voltage switch cabinet shown in fig. 1 rotated to a grounding position;

fig. 17 is a partially enlarged first schematic view of the isolating operation shaft of the high voltage switch cabinet shown in fig. 1 rotating to an isolating position;

fig. 18 is a partially enlarged schematic view of the second isolation operation shaft of the high voltage switch cabinet shown in fig. 1 rotating to the isolation position.

Wherein, in the figures, the respective reference numerals:

10-an electrical box; 11-an extension shell; 12-isolating the operating shaft; 13-a grounded operating shaft; 20-sealing cover; 30-an interlock mechanism; 40-an indicator panel; 110-side plate; 120-lower door; 121-surrounding edge; 122-a guide post; 123-a clamping and connecting plate; 130-a mounting portion; 140-protective plate; 111-a locating edge; 112-guide rail groove; 21-an aviation plug; 22-a cover plate; 221-a sealing ring; 222-a seal ring platen; 223-a stud; 31-an interlocking bracket; 32-interlocking plates; 33-a push plate; 34-a return spring; 310-a fixed plate; 311-limiting hole; 312-flanging; 313-a guide post; 321-a guide hole; 322-card slot; 323-limit gap; 324-a first receptacle; 331-a chute; 332-anti-drop holes; 333-top holding part; 334-a pushing part; 335-a second receptacle; 410-a drive plate; 420-a connecting plate; 430-a press plate; 441-a first driving plate; 442-a second drive strap; 450-a cam; 411 — first folded edge; 412-second folded edge; 413-first alignment notch; 414-second alignment notches.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 3, the high-voltage switch cabinet provided by the embodiment of the invention forms an instrument room and a cable room inside, and includes an electrical box 10, a sealing cover 20, an aviation plug 21, an interlocking mechanism 30 and an indicator board 40. The electrical box 10 can be made of stainless steel, an isolation chamber and a cable chamber are formed inside the electrical box 10, an opening is formed in one side of the isolation chamber, and a lower door 120 is arranged on one side, corresponding to the isolation chamber, of the cable chamber, where the opening is formed; the sealing cover 20 is hermetically connected to the opening of the isolation chamber, and the sealing cover 20 may be made of stainless steel and fixed on the electrical box 10 by welding. The seal cover 20 is provided with an isolation operation shaft 12 and a grounding operation shaft 13, the isolation operation shaft 12 and the grounding operation shaft 13 penetrate through the side surface of the seal cover 20, as shown in fig. 1, a cover plate 22 is arranged on the right side of the seal cover 20, and the isolation operation shaft 12 and the grounding operation shaft 13 can rotate relative to the cover plate 22. Aviation plug 21 locates on sealed cowling 20 for the secondary wiring, aviation plug 21's quantity can set up according to the actual wiring demand, sealed cowling 20 can be formed with the step in the one side that is close to the electric box 10 front end, aviation plug 21 mountable is fixed in on this step, add sealed cowling 20 in one side of electric box 10, be equipped with the aviation plug 21 that is used for the secondary wiring on the sealed cowling 20, make high tension switchgear have waterproof leak protection gas's function, sealing performance is good. The interlocking mechanism 30 is arranged on one side of the electric box 10 corresponding to the cable chamber and is in linkage with the lower door 120, the indicating plate 40 is respectively connected with the isolating operation shaft 12 and the grounding operation shaft 13 to form a linkage structure, when the isolating operation shaft 12 rotates to an isolating position, the indicating plate 40 shields the grounding operation shaft 13, the interlocking mechanism 30 locks the lower door 120 on the electric box 10, when the grounding operation shaft 13 rotates to a grounding position, the indicating plate 40 shields the isolating operation shaft 12, and the interlocking mechanism 30 loosens the lower door 120 to enable the lower door 120 to be opened. The interlocking electrical box 10 is positioned on the outer side of the electrical box 10, so that the installation and the maintenance are convenient; the linkage structure formed by the indicator plate 40, the isolation operation shaft 12 and the grounding operation shaft 13 and the linkage between the interlocking mechanism 30 and the lower door 120 can meet the requirement of five-prevention interlocking, so that the operation is safe and reliable.

According to the high-voltage switch cabinet provided by the embodiment, the operating mechanism is sealed in the sealed sealing cover 20, the internal wiring is led out in the form of the aviation plug 21, the waterproof and dustproof effects can be achieved, the cabinet protection grade can be improved to IP65, meanwhile, the modularized installation is realized, and the wiring is convenient; the indicator board 40 is linked with the isolation operation shaft 12 and the grounding operation shaft 13, and the interlocking mechanism 30 is linked with the lower door 120, so that the interlocking operation among the isolation switch, the grounding switch and the cabinet door is realized, the misoperation is prevented, the safety of electric power people is ensured, the five-prevention interlocking requirement is met, the safety operation regulation is met, and the interlocking part is installed on the outer side of the cabinet, so that the installation and the maintenance are convenient.

In an embodiment, as shown in fig. 1 and 6, a first sealing element and a second sealing element are respectively sleeved on the isolation operation shaft 12 and the ground operation shaft 13, each of the first sealing element and the second sealing element includes a sealing ring 221 and a sealing ring pressing plate 222, which are sleeved on the isolation operation shaft 12 or the ground operation shaft 13, and the sealing ring pressing plate 222 is fixedly connected to an inner wall of the seal cover 20 and presses the sealing ring 221 against the inner wall of the seal cover 20 to seal a gap where the isolation operation shaft 12 or the ground operation shaft 13 penetrates through the seal cover 20. A plurality of studs 223 are welded to the inner wall of the cover plate 22 along the peripheral sides of the isolation operation shaft 12 and the ground operation shaft 13, respectively, and a seal pressing plate 222 is inserted into each stud 223 and presses the seal 221 against the inner wall of the cover plate 22. By providing the seal ring 221 and the seal ring pressure plate 222, the isolation operation shaft 12 and the grounding operation shaft 13 can be ensured to operate normally while water resistance is ensured.

A positioning and mounting structure can be arranged between the sealing cover 20 and the cover plate 22, for example, a plurality of mounting columns are arranged on one side of the sealing cover 20, a plurality of positioning holes are correspondingly formed in the cover plate 22, and after the cover plate 22 is covered, waterproof adhesive tapes can be adhered to the periphery of the cover plate 22, so that water can be prevented from being immersed. The operating mechanism is sealed inside the sealed sealing cover 20, the internal wiring is led out in a mode of the aviation plug 21, the waterproof and dustproof effects can be achieved, meanwhile, the modularized installation is achieved, and the wiring is convenient.

In an embodiment, as shown in fig. 1 and 3, the sealing cover 20 is welded and fixed to the electrical box 10, one side of the electrical box 10 corresponding to the cable chamber is connected with the extension shell 11, the electrical box 10, the sealing cover 20 and the extension shell 11 together form a cabinet, the lower door 120 is movably mounted on the extension shell 11, a mounting portion 130 exposed to the sealing cover 20 is formed on the top surface of the extension shell 11 and the sealing cover 20 by welding, the interlocking mechanism 30 is disposed on the mounting portion 130, the interlocking mechanism 30 is located below the two operating shafts, and the mounting portion 130 is provided with an avoiding hole, so that a movable part of the interlocking electrical box 10 can move in the avoiding hole.

In one embodiment, as shown in fig. 7 and 8, the interlocking mechanism 30 includes an interlocking bracket 31, an interlocking plate 32 and a push plate 33, the interlocking bracket 31 is mounted on the electrical box 10, and can be fixed to the mounting portion 130 of the extension housing 11, the interlocking plate 32 and the push plate 33 are both slidably connected to the interlocking bracket 31, the interlocking plate 32 drives the lower door 120 to close when the push plate 33 moves backwards to be separated from the interlocking plate 32, and the backward movement refers to the push plate 33 moving towards the inner side of the extension housing 11; the interlocking plate 32 moves upward to be clamped with the push plate 33 to drive the lower door 120 to move, so that the limiting column of the lower door 120 is separated from the guide rail groove 112, and the lower door 120 can be opened.

In an embodiment, as shown in fig. 1 and fig. 3 to 5, a plurality of guide rail grooves 112 are formed on one side of the extension shell 11 close to the lower door 120, a surrounding edge 121 is formed on the periphery of the lower door 120, the surrounding edges 121 on the left and right sides are respectively adapted to be sleeved on the positioning edges 111 of the side plates 110, a plurality of guide posts 122 are formed on the inner wall of the surrounding edge 121, and when the interlocking plate 32 drives the lower door 120 to move to a predetermined position, each guide post 122 slides into each corresponding guide rail groove 112, so that the lower door 120 is closed. The extension case 11 includes a top plate and two side plates 110, the sealing cover 20 is fixed on the top plate, a protection plate 140 is upwardly disposed on one side of the top plate close to the lower door 120, and the protection plate 140 can protect the interlocking mechanism 30; the side plates 110 on two sides are respectively provided with positioning edges 111 in an extending mode, a plurality of guide rail grooves 112 are symmetrically formed in each positioning edge 111 at intervals, the guide rail grooves 112 are special-shaped grooves, each guide rail groove 112 comprises a horizontal section and a vertical section which are communicated, the vertical sections are located below the horizontal plane, when the lower door 120 is pushed inwards, the guide columns 122 firstly pass through the horizontal sections and then slide into the vertical sections, so that the lower door 120 is installed on the extending shell 11, and the process of opening the lower door 120 is opposite.

In an embodiment, as shown in fig. 9, the interlocking mechanism 30 further includes a return spring 34, two free ends of the return spring 34 are respectively connected to the push plate 33 and the interlocking plate 32, when the push plate 33 moves backward to be separated from the interlocking plate 32, the interlocking plate 32 moves downward under the combined action of its own weight and the elastic force of the return spring 34, so as to drive the lower door 120 to move downward, so that the lower door 120 is locked to the electrical box 10, and at this time, the lower door 120 cannot be opened.

As shown in fig. 3 and 8 to 10, the interlocking bracket 31 includes a fixing plate 310 and a flange 312, the fixing plate 310 is horizontally fixed to the mounting portion 130 of the extension housing 11 by screws, a limit hole 311 is formed in the fixing plate 310, an equal-diameter portion and a variable-diameter portion of the limit hole 311 are formed, the width of the equal-diameter portion is adapted to the width of the interlocking plate 32, the interlocking plate 32 is vertically inserted into the equal-diameter portion of the limit hole 311, the width of the variable-diameter portion is gradually reduced from the equal-diameter portion to a position far away from the equal-diameter portion, the width of the variable-diameter portion close to the equal-diameter portion is equal to the width of the equal-diameter portion, the length of the equal-diameter portion is smaller than the length of the variable-diameter portion, the flange 312 is formed by turning up the fixing plate 310 from the limit hole 311, the flange 312 is perpendicular to the fixing plate 310, two guide.

The interlocking plate 32 is vertically provided with a strip-shaped guide hole 321, the two guide posts 313 are slidably inserted into the guide hole 321, one end, close to the bottom, of the interlocking plate 32 is provided with a horizontally extending clamping groove 322, the opening of the clamping groove 322 faces one side of the lower door 120, the clamping groove 322 is arranged in a diameter-variable mode, the width of the clamping groove 322 is gradually increased from the position far away from the lower door 120 to the position close to the lower door 120, a clamping plate 123 is horizontally extended at the position, close to the top, inside the lower door 120, and the clamping plate 123 is slidably inserted into the clamping groove 322 of the interlocking plate 32, so that the interlocking plate 32 drives the lower door 120 to move correspondingly by means of the matching of the clamping plate 123 and the clamping groove 322.

The push plate 33 is vertically arranged, a sliding groove 331 which is horizontally arranged is formed in one side of the push plate 33, the fixing plate 310 of the interlocking support 31 is slidably inserted into the sliding groove 331, a horizontal jacking portion 333 is formed at the top of the push plate 33 in a bending mode, one side of the push plate 33 is located between the flanging 312 and the interlocking plate 32, an anti-falling hole 332 is formed in the position, corresponding to the guide column 313 at the top, of the push plate 33, and a pushing portion 334 which is abutted against the lower door 120 is formed in one side of the push plate 33, which is close to the lower door 120. A limit notch 323 is formed in one side of the interlocking plate 32, which is far away from the lower door 120, when the interlocking plate 32 moves upwards to a preset position, the interlocking plate 32 drives the lower door 120 to move upwards, each limit column of the lower door 120 is separated from the corresponding guide rail groove 112 on two sides of the extension shell 11, at this time, the lower door 120 can be opened, and in the process, the supporting part 333 of the push plate 33 is always separated from the limit notch 323 of the interlocking plate 32; a first jack 324 is arranged at a position, close to the guide post 313 at the top, of the interlocking plate 32, a second jack 335 is arranged at a position, close to the top supporting part 333, of the push plate 33, the reset spring 34 is a torsion spring, the torsion spring comprises a spiral body, a first torsion arm and a second torsion arm, the spiral body is sleeved on the guide post 313 at the top, the two torsion arms are arranged at two sides of the spiral body, the two torsion springs are approximately parallel and are arranged in a staggered manner in space, the free end of the first torsion arm is hooked on the interlocking plate 32 through the first jack 324, and the free end of the second torsion arm is hooked on the push plate 33 through the second jack 335; the lower door 120 is pressed inwardly by the pressing portion 334 of the pressing plate 33 due to an external force, so that the pressing plate 33 moves inwardly until the supporting portion 333 is completely separated from the limiting notch 323 of the interlocking plate 32, the interlocking plate 32 moves downwardly under the action of the return spring 34 and its own gravity, the lower door 120 also moves downwardly, and therefore, each limiting post on the lower door 120 enters the corresponding guide rail groove 112 on both sides of the extension housing 11, and at this time, the lower door 120 is closed and cannot be opened.

In one embodiment, as shown in fig. 7, 11 and 14, the isolating operation shaft 12 is sleeved with a first transmission piece 441, and the grounding operation shaft 13 is sleeved with a second transmission piece 442; indicator 40 is fixed with driving plate 410 through connecting plate 420, and driving plate 410 is located between indicator 40 and the sealed cowling 20, and indicator 40 is vertical to be laid, and connecting plate 420 is perpendicular with indicator 40 and driving plate 410 respectively, but indicator 40, connecting plate 420 and driving plate 410 three set up as an organic whole, also can pass through screw fastening. The interval is arranged between the transmission plate 410 and the indication plate 40, the interval is arranged between the indication plate 40 and the isolation operation shaft 12 and between the indication plate 40 and the grounding operation shaft 13, the transmission plate 410 is linked with the first transmission piece 441 and the second transmission piece 442, the transmission plate 410 can be driven to move downwards when the isolation operation shaft 12 drives the first transmission piece 441 to rotate, and the transmission plate 410 can be driven to move upwards when the grounding operation shaft 13 drives the second transmission piece 442 to rotate.

In one embodiment, as shown in fig. 3, 7 and 11, the grounding operating shaft 13 is sleeved with a cam 450, the cam 450 is generally fan-shaped as a whole and has a large diameter end and a small diameter end, when the cam 450 rotates to the grounding position along with the grounding operating shaft 13, the indicating plate 40 shields the isolating operating shaft 12, the interlocking plate 32 can move upward, and the lower door 120 can be opened; when the cam 450 rotates to the isolation position along with the isolation operation shaft 12, the indication plate 40 shields the grounding operation shaft 13, the interlocking plate 32 is pressed by the cam 450 and cannot move upwards, and the lower door 120 cannot be opened.

In an embodiment, as shown in fig. 7 and 11, the isolating operation shaft 12 is located right above the grounding operation shaft 13, a first positioning notch 413 adapted to the isolating operation shaft 12 is disposed on one side of the transmission plate 410, a second positioning notch 414 adapted to the grounding operation shaft 13 is disposed on the other side of the transmission plate 410, the first positioning notch 413 and the second positioning notch 414 are both vertically disposed, the first positioning notch 413 is disposed at the upper end of the transmission plate 410, the second positioning notch 414 is disposed at the lower end of the transmission plate 410, the isolating operation shaft 12 slides along the first positioning notch 413 when the transmission plate 410 moves up and down, and the grounding operation shaft 13 slides along the second positioning notch 414.

A pressing plate 430 is further arranged between the indicating plate 40 and the transmission plate 410, through holes are respectively formed in positions of the pressing plate 430 corresponding to the isolating operation shaft 12 and the grounding operation shaft 13, the isolating operation shaft 12 and the grounding operation shaft 13 respectively penetrate through the through holes corresponding to the pressing plate 430, and the pressing plate 430 plays a role in auxiliary positioning, so that the transmission plate 410 is kept parallel to the vertical direction in the up-and-down movement process.

In an embodiment, as shown in fig. 11 and 12, the first driving plate 441 and the second driving plate 442 are both fan-shaped plates, a first bending edge 411 is formed at one end of the driving plate 410, a second bending edge 412 is formed at the other end of the driving plate, the first bending edge 411 extends into a notch of the first driving plate 441, the second bending edge 412 extends into a notch of the second driving plate 442, the first driving plate 441 drives the driving plate 410 to move upwards through the first bending edge 411, and the second driving plate 442 drives the driving plate 410 to move downwards through the second bending edge 412.

As shown in fig. 12 to 14, the first driving plate 441 is a sector plate with a 90-degree notch, the second driving plate 442 is a sector plate with a 180-degree notch, and the first bending edge 411 and the second bending edge 412 are located on opposite corners of the driving plate. When the isolating operation shaft 12 and the grounding operation shaft 13 are located at the initial positions, the notch of the first transmission piece 441 faces the right side and inclines upwards, the notch of the second transmission piece 442 faces downwards, the indicating plate 40 is located at the middle position, the large-diameter end of the cam 450 faces downwards and the small-diameter end of the cam 450 faces upwards, the isolating operation shaft 12 and the grounding operation shaft 13 are both exposed out of the indicating plate 40, the large-diameter end of the cam 450 abuts against the interlocking plate 32, the interlocking plate 32 cannot move upwards, and the lower door 120 cannot be opened.

As shown in fig. 15 and 16, when the grounding operation shaft 13 rotates counterclockwise to the grounding position, the switch is grounded and switched on, the second driving strap 442 drives the driving plate 410 to move upward through the second bent edge, the indicating plate 40 blocks the upper isolating operation shaft 12, the isolating operation shaft 12 cannot be operated, and the large-diameter end of the cam 450 rotates to the upward direction, the interlocking plate 32 can move upward, and at this time, the lower door 120 can be opened.

As shown in fig. 17 and 18, when the isolating operation shaft 12 rotates clockwise to the isolating position, the first transmission piece 441 drives the transmission plate 410 to move downward through the first bent edge 411, the indicating plate 40 blocks the grounding operation shaft 13 below, the grounding operation shaft 13 cannot be operated, and at this time, the large-diameter end of the cam 450 rotates to the downward direction, the interlocking plate 32 cannot move upward, and therefore the lower door 120 cannot be opened.

The lower problem of high tension switchgear protection level has been solved to this application, and the protection level can reach IP65, sets up the problem of drawing forth that aviation plug 21 can solve the internal wiring on sealed cowling 20, with the interlocking design of switch in the sealed cowling 20 outside, can easy to assemble and overhaul, simultaneously, adopts the interlocking of the hard mode realization lower door 120 of interlocking of machinery, designs safe and reliable more.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.