Ring main unit

Abstract

The utility model provides a ring main unit, and relates to the field of ring main units. The ring main unit comprises a cabinet body, and the lower part of the inner side of the cabinet body is fixedly connected with a switch; the switch comprises a shell, fixing seats are symmetrically arranged in the shell, a plurality of wiring terminals are arranged on one end face of each fixing seat, first contacts electrically connected with the corresponding wiring terminals are arranged on the other end face of each fixing seat, the wiring terminals extend out of the shell, the upper ends of the first contacts are cambered surfaces, and the lower ends of the first contacts are arc surfaces. A movable seat capable of moving left and right is arranged between the two fixed seats, and second contacts are arranged at the upper end and the lower end of the movable seat in an exposed mode. And by arranging the fixed seat and the movable seat, the generation of electric arc can be avoided in the on-off process of the switch.

Description

Technical Field

[0001] The utility model relates to the technical field of ring network cabinets, in particular to a ring network cabinet. Background Art

[0002] A ring main unit is a group of electrical equipment (high voltage switchgear) installed in a metal or non-metallic insulating cabinet or made into an assembled interval ring main unit. Its core parts use load switches and fuses.

[0003] The load switches used in the ring main unit are mostly in the form of knife switches, which are prone to arcing during the on-off process. Although a simple arc extinguishing structure is provided, there are still safety accidents caused by arcing. At the same time, the exposed knife switch structure occupies a large space in the ring main unit, which is prone to accidental contact during maintenance, which is highly dangerous. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a ring network cabinet, which solves the problem that the switch used in the prior ring network cabinet is prone to arcing.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions: a ring main unit, including a cabinet, a switch is fixedly connected to the lower inner part of the cabinet, the space on the upper part of the cabinet is used to install electric secondary equipment, the cabinet is a rectangular parallelepiped structure, and a wiring hole is provided at the bottom of the cabinet, and a cabinet door is rotatably connected to the front of the cabinet;

[0008] The switch comprises a housing, a fixing seat is symmetrically arranged inside the housing, a plurality of wiring terminals are arranged on one end surface of the fixing seat, and a first contact electrically connected to the corresponding wiring terminal is arranged on the other end surface, the wiring terminals are all extended from the housing, the upper end of the first contact is an arc surface, the structure of the arc surface makes the first contact protrude upward, which is convenient for contacting with other contacts, and the material of the first contact is preferably a silver contact, one of the two fixing seats is used for connecting the input cable, and the other is used for connecting the output cable, and the cable is connected to the wiring terminal;

[0009] A movable seat that moves left and right is arranged between the two fixed seats, and the upper and lower ends of the movable seat are exposed to be provided with a second contact. The movable seat has two working positions, and one of the working positions realizes the contact and electrical connection of the first contact and the second contact, and the other working position realizes the separation of the first contact and the second contact, that is, the switching on and off of the switch, and the first contact and the second contact of the arc surface are in more complete contact to ensure the electrical performance.

[0010] Preferably, the upper end surface of the movable seat is also provided with a plurality of groups of insulating rubber blocks. When the first contact and the second contact are separated, each insulating rubber block slides correspondingly onto the first contact, i.e., covers the first contact, for insulating setting. At the same time, the insulating rubber block can wipe the first contact to remove the oxide and covering generated by the contact, so that the first contact and the second contact can contact more fully next time.

[0011] Preferably, a fuse is arranged inside the movable seat, and two ends of the fuse are electrically connected to second contacts located above and below respectively, that is, two second contacts are arranged, and the fuse is clamped in the middle, and the second contact is movably arranged, so that when the protruding arc surface of the first contact contacts the second contact, the fuse is clamped more tightly.

[0012] Preferably, the front of the movable seat is covered with a cover plate, and the cover plate covers the front of the fuse. The upper and lower parts of the cover plate are fixed with screws, and the cover plate can be opened to replace the fuse. The front of the shell is rotatably connected to a maintenance door, and the maintenance door is rotated open to expose the fixed seat and the movable seat.

[0013] Preferably, a first spring is provided on the left side of the movable seat, and the other end of the first spring abuts against the side wall of the shell, and a push plate is fixedly connected to the other side of the movable seat. An inclined block is provided inside the shell for sliding up and down, and the other side of the push plate abuts against the inclined surface of the inclined block, that is, the first spring is used to keep the movable seat moving to the right, and pushes the inclined block downward, and the push plate in contact with the inclined surface pushes the movable seat to move forward, thereby realizing the switching between two different workstations.

[0014] Preferably, a fixed shaft is fixedly connected to the bottom of the push plate, a rotating sleeve is rotatably connected to the fixed shaft, a hook rod is fixedly connected to the side wall of the rotating sleeve, and the front end of the hook rod hooks the preset through hole of the push plate. When the front end of the hook rod is separated from the push plate, the first spring is released, and the movable seat moves to the right, changing the working position, that is, changing the state of the switch.

[0015] Preferably, a torsion spring is sleeved on the fixed shaft, one end of the torsion spring is fixed on the fixed shaft, and the other end is fixed on the rotating sleeve, so that the hook rod rotates toward the push plate to ensure that the hook rod can hook the push plate when the push plate moves to the left.

[0016] Preferably, a push rod is fixedly connected to the side wall of the rotating sleeve, an electric cylinder is arranged inside the outer shell, and a telescopic rod is fixedly connected to the output end of the electric cylinder. The telescopic rod is extended to press against the push rod, and the rotating sleeve is subjected to force to make the hook rod rotate away from the push plate. The action of the electric cylinder can realize the rotation of the rotating sleeve, and the hook rod releases the push plate.

[0017] Preferably, a second spring is provided at the lower end of the ramp block, the lower end of the second spring abuts against the inner wall of the shell, and the second spring is used to keep the ramp block at the upper side so that there is enough space on the right side when the push plate is released.

[0018] Preferably, a handle is fixedly connected to the side wall of the inclined plane block, and the handle extends out of the shell, the handle is used to pull down the inclined plane block so that the movable seat moves to the left, and the shell is provided with an opening for the handle to move up and down.

[0019] Preferably, both side walls of the lower part of the cabinet are fixedly connected with fixing plates, the slots arranged on the upper parts of both sides of the switch cooperate with the fixing plates, fixing bolts are threadedly connected on both sides of the upper end of the switch, and the lower ends of the fixing bolts are against the fixing plates. The switch can be slid out by loosening the fixing bolts.

[0020] (III) Beneficial effects

[0021] The utility model provides a ring network cabinet. It has the following beneficial effects:

[0022] 1. The switch used in the utility model is provided with a fixed seat and a movable seat, and the movable seat is clamped between two fixed seats, the gap is small, arc is not easy to be generated, and the first contact and the second contact are shielded, so the safety is high.

[0023] 2. The utility model is provided with components such as an inclined surface block, a first spring, a hook rod, etc., which can facilitate the opening and closing operation of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0025] Figure 2 This is a schematic diagram of the internal structure of the switch of the utility model;

[0026] Figure 3 It is a front view schematic diagram of the fixing seat of the utility model;

[0027] Figure 4 It is a partial cross-sectional schematic diagram of the movable seat of the utility model;

[0028] Figure 5 for Figure 2 Enlarged view of point A in the middle.

[0029] Among them, 1. cabinet body; 2. cabinet door; 3. switch; 4. fixing bolts;

[0030] 11. Wiring hole; 12. Fixed plate; 31. Maintenance door; 32. Housing; 33. First spring; 34. Fixed seat; 35. Wiring terminal; 36. Movable seat; 37. Cover plate; 38. Push plate; 39. Second spring; 310. Handle; 311. Inclined block; 312. First contact; 313. Insulating rubber block; 314. Second contact; 315. Fuse; 316. Push rod; 317. Telescopic rod; 318. Electric cylinder; 319. Hook rod; 320. Fixed shaft; 321. Torsion spring; 322. Rotating sleeve. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Example:

[0033] like Figure 1-5 As shown, the embodiment of the utility model provides a ring network cabinet, including a cabinet 1, a switch 3 is fixedly connected to the lower inner side of the cabinet 1, and the switch 3 here is the main switch of the ring network cabinet. The switch 3 of the traditional ring network cabinet is mostly in the form of a knife switch, which is easy to generate an arc and cause a safety accident. The space on the upper part of the cabinet 1 is used to install electric secondary equipment. The cabinet 1 is a rectangular parallelepiped structure, which is a conventional structure and more necessary. A heat dissipation window can be opened on the upper part of the cabinet 1, but waterproof and moisture-proof measures need to be taken, and a wiring hole 11 is provided at the bottom of the cabinet 1 for the entry and exit of cables. According to actual needs, a base is set up at the bottom of the cabinet 1, such as a cement base, etc., and a cabinet door 2 is also rotatably connected to the front of the cabinet 1. The cabinet door 2 can be opened to operate the internal equipment of the ring network cabinet;

[0034] The switch 3 includes a housing 32, and a fixing seat 34 is symmetrically arranged inside the housing 32, which is fixed to the upper top wall and the lower bottom wall of the housing 32 respectively. According to actual needs, wear-resistant insulating materials such as ceramics can be used, and a shock-absorbing rubber pad can be arranged between the fixing seat 34 and the housing 32. One end face of the fixing seat 34 is provided with a plurality of wiring terminals 35, and the wiring terminals 35 are used for connecting cables. The other end face is provided with a first contact 312 electrically connected to the corresponding wiring terminal 35. The wiring terminals 35 all extend from the housing 32. The upper end of the first contact 312 is an arc surface. The structure of the arc surface makes the first contact 312 protrude upward, which is conducive to contact with other contacts. The material of the first contact 312 is preferably a silver contact. Silver has a soft texture, good conductivity, and excellent electrical conductivity. One of the two fixing seats 34 is used for connecting the input cable, and the other is used for connecting the output cable. The cable is connected to the wiring terminal 35, and a through hole is provided on the wiring terminal 35, which is convenient for connecting with components such as bolts.

[0035] A movable seat 36 that moves left and right is arranged between the two fixed seats 34. When the movable seat 36 is preferably arranged, it is clamped between the two fixed seats 34, which is conducive to the full contact of the first contact 312. The upper and lower ends of the movable seat 36 are exposed and provided with the second contact 314. The movable seat 36 has two workstations, and one of the workstations realizes the contact and electrical connection between the first contact 312 and the second contact 314, and the other workstation realizes the separation of the first contact 312 and the second contact 314, that is, the conduction and disconnection of the switch 3, and the arc surface of the first contact 312 and the second contact 314 is more fully in contact, ensuring the electrical performance. At the same time, the gap between the fixed seat 34 and the movable seat 36 is small, which avoids the generation of electric arc and improves the safety of the ring network cabinet.

[0036] The upper end surface of the movable seat 36 is still provided with a plurality of groups of insulating rubber blocks 313. When the first contact 312 and the second contact 314 are separated, each insulating rubber block 313 slides onto the first contact 312 correspondingly, that is, covers the first contact 312 for insulation. Even if an arc is generated during the operation of the switch 3, the insulating rubber block 313 can extinguish the arc. At the same time, the insulating rubber block 313 can wipe the first contact 312 to remove the oxide and covering generated by the contact, so that the first contact 312 and the second contact 314 can contact more fully next time.

[0037] A fuse 315 is arranged inside the movable seat 36 to improve the safety of the installation. In addition, most of the existing fuses 315 are separated from the switch 3, but they are combined here, which is beneficial to reducing the volume of the entire power supply system. The two ends of the fuse 315 are electrically connected to the second contacts 314 located above and below, respectively, that is, two second contacts 314 are provided, and the fuse 315 is clamped in the middle. The second contact 314 is movably arranged, so that when the protruding arc surface of the first contact 312 contacts the second contact 314, the fuse 315 is clamped more tightly.

[0038] The front of the movable seat 36 is covered with a cover plate 37, which covers the front of the fuse 315. A sealing ring and an elastic insulating block that resists the fuse 315 can be provided at the edge of the cover plate 37 to ensure the stable operation of the fuse 315. The upper and lower parts of the cover plate 37 are fixed with screws. The cover plate 37 can be opened to replace the fuse 315. The front of the housing 32 is rotatably connected to a maintenance door 31, which is rotated open to expose the fixed seat 34 and the movable seat 36.

[0039] A first spring 33 is provided on the left side of the movable seat 36, and the other end of the first spring 33 presses against the side wall of the shell 32. A push plate 38 is fixedly connected to the other side of the movable seat 36. A ramp block 311 is provided inside the shell 32 for sliding up and down. The ramp block 311 is a block that is wide at the top and narrow at the bottom, and the ramp is arranged opposite to the movable seat 36. The distance of movement can extend the ramp block 311 upward out of the shell 32, and the other side of the push plate 38 presses against the ramp of the ramp block 311, that is, the first spring 33 is used to keep the movable seat 36 moving to the right, and push the ramp block 311 downward, and the push plate 38 in contact with the ramp pushes the movable seat 36 to move left, thereby realizing the switching between two different workstations.

[0040] A fixed shaft 320 is fixedly connected to the bottom of the push plate 38, and the end of the fixed shaft 320 is fixed to the inner wall of the shell 32. A rotating sleeve 322 is rotatably connected to the fixed shaft 320, and a hook rod 319 is fixedly connected to the side wall of the rotating sleeve 322, that is, the front end of the hook rod 319 has a hook structure, and the front end of the hook rod 319 hooks the preset through hole of the push plate 38 to limit the position of the push plate 38. When the front end of the hook rod 319 is separated from the push plate 38, the first spring 33 is released, and the movable seat 36 moves to the right to change the working position, that is, change the state of the switch 3.

[0041] A torsion spring 321 is sleeved on the fixed shaft 320, one end of the torsion spring 321 is fixed on the fixed shaft 320, and the other end is fixed on the rotating sleeve 322, so as to maintain the torsion spring 321 with a preload and enable the hook rod 319 to rotate toward the push plate 38, thereby ensuring that the hook rod 319 can hook the push plate 38 during the movement of the push plate 38 to the left, so as to limit the position of the push plate 38.

[0042] The side wall of the rotating sleeve 322 is fixedly connected with the push rod 316, the interior of the outer shell 32 is provided with an electric cylinder 318, and the output end of the electric cylinder 318 is fixedly connected with the telescopic rod 317, the telescopic rod 317 is extended to resist the push rod 316, the rotating sleeve 322 is subjected to force so that the hook rod 319 rotates away from the push plate 38, the action of the electric cylinder 318 can realize the rotation of the rotating sleeve 322, and the hook rod 319 releases the push plate 38.

[0043] The above-mentioned fixed shaft 320, hook rod 319, electric cylinder 318 and other components can be arranged above the push plate 38 with respect to the push plate 38.

[0044] A second spring 39 is disposed at the lower end of the ramp block 311 , and the lower end of the second spring 39 abuts against the inner wall of the housing 32 . The second spring 39 is used to keep the ramp block 311 at the upper side so that there is enough space on the right side when the push plate 38 is released.

[0045] The side wall of the inclined plane block 311 is fixedly connected with a handle 310, and the handle 310 extends out of the shell 32. The handle 310 is used to pull down the inclined plane block 311 so that the movable seat 36 moves to the left, and the shell 32 is provided with an opening for the handle 310 to move up and down.

[0046] The lower side walls of the cabinet 1 are fixedly connected with fixing plates 12, and the slots arranged on the upper parts of the two sides of the switch 3 cooperate with the fixing plates 12. The upper sides of the switch 3 are threadedly connected with fixing bolts 4, and the lower ends of the fixing bolts 4 are against the fixing plates 12. Loosen the fixing bolts 4 and the switch 3 can be slid out.

[0047] Working principle: When the switch 3 is turned on, the inclined surface block 311 is pulled down by the handle 310, and under the action of the inclined surface and the push plate 38, the movable seat 36 moves to the left. When the first contact 312 and the second contact 314 are in contact, the hook rod 319 just hooks the through hole on the push plate 38, which is used to limit the position of the push plate 38;

[0048] When the switch 3 is disconnected, the electric cylinder 318 is started, the rotating sleeve 322 rotates, the hook rod 319 and the push plate 38 are separated, and the movable seat 36 moves to the right under the action of the first spring 33, that is, the first contact 312 and the second contact 314 are separated.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ring main unit, comprising a cabinet body (1), characterized in that: A switch (3) is fixedly connected to the lower inner portion of the cabinet (1); The switch (3) comprises a housing (32), a fixing seat (34) is symmetrically arranged inside the housing (32), a plurality of wiring terminals (35) are arranged on one end surface of the fixing seat (34), and a first contact (312) electrically connected to the corresponding wiring terminals (35) is arranged on the other end surface, the wiring terminals (35) all extend from the housing (32), and the upper end of the first contact (312) is an arc surface; A movable seat (36) that moves leftward and rightward is arranged between the two fixed seats (34), and a second contact point (314) is exposed at the upper end and the lower end of the movable seat (36).

2. A ring main unit according to claim 1, characterized in that: A fuse (315) is disposed inside the movable seat (36), and two ends of the fuse (315) are electrically connected to second contacts (314) located above and below, respectively.

3. A ring main unit according to claim 2, characterized in that: The front of the movable seat (36) is covered with a cover plate (37), which covers the front of the fuse (315). The upper and lower parts of the cover plate (37) are fixed with screws.

4. The ring main unit according to claim 1, characterized in that: A first spring (33) is arranged on the left side of the movable seat (36), and the other end of the first spring (33) abuts against the side wall of the outer shell (32). A push plate (38) is fixedly connected to the other side of the movable seat (36). An inclined surface block (311) is arranged inside the outer shell (32) so as to slide up and down, and the other side of the push plate (38) abuts against the inclined surface of the inclined surface block (311).

5. A ring main unit according to claim 4, characterized in that: A fixed shaft (320) is fixedly connected below the push plate (38), a rotating sleeve (322) is rotatably connected to the fixed shaft (320), a hook rod (319) is fixedly connected to the side wall of the rotating sleeve (322), and the front end of the hook rod (319) hooks a preset through hole of the push plate (38).

6. A ring main unit according to claim 5, characterized in that: A torsion spring (321) is sleeved on the fixed shaft (320), one end of the torsion spring (321) is fixed on the fixed shaft (320), and the other end is fixed on the rotating sleeve (322), so that the hook rod (319) rotates toward the push plate (38).

7. The ring main unit according to claim 5, characterized in that: The side wall of the rotating sleeve (322) is fixedly connected to a push rod (316), an electric cylinder (318) is arranged inside the housing (32), and an output end of the electric cylinder (318) is fixedly connected to a telescopic rod (317), the telescopic rod (317) extends out to press against the push rod (316), and the rotating sleeve (322) is subjected to force so that the hook rod (319) rotates away from the push plate (38).

8. The ring main unit according to claim 4, characterized in that: A second spring (39) is disposed at the lower end of the inclined surface block (311), and the lower end of the second spring (39) abuts against the inner wall of the outer shell (32).

9. The ring main unit according to claim 4, characterized in that: A handle (310) is fixedly connected to the side wall of the inclined surface block (311), and the handle (310) extends out of the housing (32).

10. The ring main unit according to claim 1, characterized in that: The lower side walls of the cabinet (1) are fixedly connected with a fixing plate (12), the slots provided on the upper sides of the switch (3) are matched with the fixing plate (12), the upper sides of the switch (3) are threadedly connected with fixing bolts (4), and the lower ends of the fixing bolts (4) are against the fixing plate (12).

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