Gas-insulated metal-enclosed switchgear

Abstract

The utility model discloses a gas-insulated metal-enclosed switchgear, which is characterized in that two protective shells at the same height are respectively provided with a sliding hole, and a first rack is slidably mounted in the sliding holes at the opposite sides of the two protective shells; wherein one first rack is fixedly provided with a first contact, the other first rack is provided with a second contact matched with the first contact, a fixing frame provided with a gear in a rotating mode is installed in the protective shell in a sliding mode, and the gear is connected with the first racks in an engaged mode. A second rack connected with the gear in a meshed mode is fixedly installed on the bottom plate in the protection shell, a second magnet is installed at the end, close to the sliding hole, in the protection shell, a first electromagnet matched with the second magnet is installed on the fixing frame, and an insulating elastic piece is arranged between the fixing frame and the inner wall of the protection shell. The gas-insulated metal-enclosed switchgear provided by the utility model is beneficial to shortening the time of current disconnection, reducing the chance of arc generation, and improving the safety and reliability of a circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of gas-insulated switchgear, in particular to a gas-insulated metal-enclosed switchgear. Background Art

[0002] Gas-insulated metal-enclosed switchgear is a switchgear that uses gas as the insulating medium. Its shell is filled with SF6 insulating gas at a certain pressure. It has the advantages of small footprint, high operating reliability, small maintenance workload, long maintenance cycle, no influence from external environmental conditions, no electrostatic induction and corona interference, etc. It is widely used in power systems.

[0003] After searching, the patent publication number CN109830911A discloses a "new type of environmentally friendly gas-insulated fully enclosed fully insulated ring network switchgear", including a stainless steel welded sealed box and an isolating switch assembly installed in the stainless steel welded sealed box. The cavity inside the stainless steel welded sealed box forms a gas box filled with insulating gas. The upper part of the stainless steel welded sealed box is connected to the insulating busbar, and the lower part is connected to the cable connection plug. The isolating switch assembly is installed in the stainless steel welded sealed box through a grounding frame. The closing button and the opening button for controlling the isolating switch assembly are installed on the outside of the stainless steel welded sealed box. The insulation performance of the device meets the requirements of power frequency withstand voltage and impulse withstand voltage. The oxygen content of its insulating gas is reduced by half compared with dry and purified air, which can not only improve the heat capacity of the mixed gas, but also reduce oxygen corrosion of equipment parts.

[0004] In the prior art, a three-position isolating switch of closing, isolating and grounding is formed by rotating a double-headed isolating movable blade plate, and utilizing the two blade plates to contact the isolating upper contact, the isolating lower contact and the grounding electrostatic contact respectively. However, an arc is generated when the double-headed isolating movable blade plate contacts the contact to realize opening and closing, and when the opening and closing speed is slow, the gap between the contacts will continue to exist for a period of time when the circuit is disconnected or connected, resulting in a prolonged arc duration. Long-term arcing will generate high temperature and energy loss, increasing the risk of wear and damage to the equipment. Utility Model Content

[0005] The utility model aims to solve the shortcomings of the prior art and proposes a gas-insulated metal-enclosed switchgear which is beneficial to shorten the time of current disconnection, reduce the chance of arc generation, and improve the safety and reliability of the circuit.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a gas-insulated metal-enclosed switchgear, comprising: a box body, a sealing door rotatably mounted on one side of the box body, a plurality of protective shells symmetrically arranged inside the box body, two protective shells located at the same height each having a sliding hole, a first rack slidably mounted inside the sliding holes located on opposite sides of the two protective shells, one of the first racks having a first contact fixedly mounted thereon, and the other first rack having a second contact matched with the first contact mounted thereon;

[0007] A fixed frame rotatably mounted with a gear is slidably mounted inside the protective shell, the gear is meshed with the first rack, a second rack meshed with the gear is fixedly mounted on the inner bottom plate of the protective shell, a second magnet is mounted on one end of the protective shell near the sliding hole, a first electromagnet matched with the second magnet is mounted on the fixed frame, and an insulating elastic part is arranged between the fixed frame and the inner wall of the protective shell, when the first electromagnet and the second magnet are energized, the first electromagnet and the second magnet repel each other with the same polarity so that the insulating elastic part is in a stretched state.

[0008] The further improved scheme in the above technical scheme is as follows:

[0009] 1. In the above solution, a guide groove is provided on both sides of the fixing frame and on the inner wall of the protective shell, and the fixing frame is provided with a fixing shaft embedded in the guide groove.

[0010] 2. In the above solution, the insulating elastic parts are respectively arranged on both sides of the fixing frame and between the fixing shaft and the inner wall of the protective shell.

[0011] 3. In the above solution, when the first electromagnet and the second magnet are powered off, the insulating elastic member is in a contracted state.

[0012] 4. In the above scheme, two protective shells located at the same height constitute a protective shell group, and a plurality of protective shell groups are arranged at equal intervals along the length direction of the box body.

[0013] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0014] The utility model discloses a gas-insulated metal-enclosed switchgear, in which a first rack is slidably installed inside a sliding hole respectively located at opposite sides of two protective shells, wherein a first contact is fixedly installed on one of the first racks, and a second contact cooperating with the first contact is installed on the other first rack, a second magnet is installed at one end of the interior of the protective shell close to the sliding hole, and a first electromagnet cooperating with the second magnet is installed on a fixing frame, and an insulating elastic member is arranged between the fixing frame and the inner wall of the protective shell, when the first electromagnet and the second electromagnet are energized, the first electromagnet is repelled by the second electromagnet and drives the fixing frame to slide along the inner wall of the protective shell, and the fixed shaft drives the gear to roll along the second rack, so that the two first racks are moved away from each other, and the first contact and the second contact are quickly separated, which is beneficial to shorten the time of current disconnection, reduce the chance of arc generation, and improve the safety and reliability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 This is a schematic diagram of the overall structure of the gas-insulated metal-enclosed switchgear of the utility model;

[0016] Attached Figure 2 This is a schematic diagram of the internal structure of the gas-insulated metal-enclosed switchgear of the utility model;

[0017] Attached Figure 3 It is a schematic diagram of the partial structure of the gas-insulated metal-enclosed switchgear of the utility model.

[0018] In the above drawings: 1, box body; 2, sealing door; 3, guide groove; 4, insulating elastic member; 5, fixed shaft; 6, second rack; 7, sliding hole; 8, protective shell; 9, first electromagnet; 10, second electromagnet; 11, first contact; 12, second contact; 13, first rack; 14, fixed frame; 15, gear. DETAILED DESCRIPTION

[0019] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0020] Embodiment 1: A gas-insulated metal-enclosed switchgear comprises: a box body 1, a sealing door 2 rotatably mounted on one side of the box body 1, a plurality of protective shells 8 are symmetrically arranged inside the box body 1, two protective shells 8 located at the same height are respectively provided with a sliding hole 7, and a first rack 13 is slidably mounted inside the sliding hole 7 located on opposite sides of the two protective shells 8, wherein a first contact 11 is fixedly mounted on one of the first racks 13, and a second contact 12 matching the first contact 11 is mounted on the other first rack 13;

[0021] When the first electromagnet and the second electromagnet are energized, since the two electromagnets repel each other in the same direction, the two first electromagnets are subjected to the repulsive force to drive the two fixing frames to move in opposite directions, the insulating elastic member is stretched, and the fixing frame pushes the gear to rotate along the second rack through the fixed shaft. At the same time, the first rack also slides toward the inside of the protective shell driven by the gear, thereby separating the first contact and the second contact, so that the circuit of the device is cut off;

[0022] A fixing frame 14 rotatably mounted with a gear 15 is slidably mounted inside the protective shell 8, the gear 15 is meshedly connected with the first rack 13, a second rack 6 meshedly connected with the gear 15 is fixedly mounted on the inner bottom plate of the protective shell 8, a second magnet 10 is mounted on one end of the protective shell 8 near the sliding hole 7, and a first electromagnet 9 matched with the second magnet 10 is mounted on the fixing frame 14, and an insulating elastic member 4 is arranged between the fixing frame 14 and the inner wall of the protective shell 8, when the first electromagnet 9 and the second magnet 10 are energized, the first electromagnet 9 and the second magnet 10 repel each other with the same polarity so that the insulating elastic member 4 is in a stretched state;

[0023] In the process of separating the first contact and the second contact, the gear moves with the second rack, and since the gear meshes with the first rack and the second rack, the movement speed of the first rack is accelerated, thereby achieving rapid separation of the first contact and the second contact.

[0024] A guide groove 3 is provided on both sides of the fixing frame 14 and on the inner wall of the protective shell 8 , and a fixing shaft 5 is provided on the fixing frame 14 and embedded in the guide groove 3 .

[0025] The insulating elastic member 4 is disposed on both sides of the fixing frame 14 and between the fixing shaft 5 and the inner wall of the protective shell 8;

[0026] When the first electromagnet and the second electromagnet are not energized, the insulating elastic member uses its own elasticity to pull the first contact and the second contact closer to each other and make contact, so that the device circuit is connected.

[0027] When the first electromagnet 9 and the second magnet 10 are powered off, the insulating elastic member 4 is in a contracted state.

[0028] The fixing frame 14 is in a C-shape.

[0029] Embodiment 2: A gas-insulated metal-enclosed switchgear, comprising: a box body 1, a sealing door 2 rotatably mounted on one side of the box body 1, a plurality of protective shells 8 symmetrically arranged inside the box body 1, two protective shells 8 located at the same height each having a sliding hole 7, a first rack 13 slidably mounted inside the sliding holes 7 located on opposite sides of the two protective shells 8, one of the first racks 13 having a first contact 11 fixedly mounted thereon, and the other first rack 13 having a second contact 12 matched with the first contact 11 mounted thereon;

[0030] A fixing frame 14 rotatably mounted with a gear 15 is slidably mounted inside the protective shell 8, the gear 15 is meshedly connected with the first rack 13, a second rack 6 meshedly connected with the gear 15 is fixedly mounted on the inner bottom plate of the protective shell 8, a second magnet 10 is mounted on one end of the protective shell 8 near the sliding hole 7, and a first electromagnet 9 matched with the second magnet 10 is mounted on the fixing frame 14, and an insulating elastic member 4 is arranged between the fixing frame 14 and the inner wall of the protective shell 8, when the first electromagnet 9 and the second magnet 10 are energized, the first electromagnet 9 and the second magnet 10 repel each other with the same polarity so that the insulating elastic member 4 is in a stretched state;

[0031] When the first electromagnet and the second electromagnet are energized, the first electromagnet is repelled by the second electromagnet and drives the fixed frame to slide along the inner wall of the protective shell, and the fixed shaft drives the gear to roll along the second rack, so that the two first racks move away from each other, realizing the rapid separation of the first contact and the second contact, which is beneficial to shorten the current disconnection time, reduce the chance of arc generation, and improve the safety and reliability of the circuit.

[0032] A guide groove 3 is provided on both sides of the fixing frame 14 and on the inner wall of the protective shell 8 , and a fixing shaft 5 is provided on the fixing frame 14 and embedded in the guide groove 3 .

[0033] The insulating elastic members 4 are respectively disposed on both sides of the fixing frame 14 and between the fixing shaft 5 and the inner wall of the protective shell 8 .

[0034] When the first electromagnet 9 and the second magnet 10 are powered off, the insulating elastic member 4 is in a contracted state.

[0035] Two protective shells 8 located at the same height constitute a protective shell group, and a plurality of protective shell groups are arranged at equal intervals along the length direction of the box body 1;

[0036] The protective shell is made of magnetic insulation materials commonly used by technicians in this field, and can be made of ceramic, polyethylene, carbon fiber, glass fiber composite materials, etc., without specific limitation, to avoid affecting the normal operation of the first electromagnet and the second electromagnet.

[0037] The fixed shaft 5 is slidably connected to the guide groove 3 .

[0038] The working principle is:

[0039] During use, when the first electromagnet and the second electromagnet are energized, since the two repel each other in the same direction, the two first electromagnets are subjected to the repulsive force and drive the two fixing frames to move in opposite directions respectively, the insulating elastic member is stretched, and the fixing frame pushes the gear to rotate along the second rack through the fixed shaft, and at the same time, the first rack also slides toward the inside of the protective shell driven by the gear, thereby separating the first contact and the second contact, so that the device circuit is cut off, and in the process of separating the first contact and the second contact, the gear moves with the second rack, and since the gear is meshed with the first rack and the second rack, the movement speed of the first rack is accelerated, thereby realizing the rapid separation of the first contact and the second contact;

[0040] When the first electromagnet and the second electromagnet are not energized, the insulating elastic member uses its own elasticity to pull the first contact and the second contact closer to each other and make contact, so that the device circuit is connected.

[0041] When the above-mentioned gas-insulated metal-enclosed switchgear is used, after the first electromagnet and the second electromagnet are energized, the first electromagnet is repelled by the second electromagnet and drives the fixed frame to slide along the inner wall of the protective shell, and the fixed shaft drives the gear to roll along the second rack, so that the two first racks move away from each other, realizing the rapid separation of the first contact and the second contact, which is beneficial to shorten the current disconnection time, reduce the chance of arc generation, and improve the safety and reliability of the circuit.

[0042] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A gas-insulated metal-enclosed switchgear, comprising: A box body (1), a sealing door (2) rotatably mounted on one side of the box body (1), characterized in that: a plurality of protective shells (8) are symmetrically arranged inside the box body (1), two protective shells (8) located at the same height each have a sliding hole (7), and a first rack (13) is slidably mounted inside the sliding hole (7) located on opposite sides of the two protective shells (8), one of the first racks (13) is fixedly mounted with a first contact (11), and the other first rack (13) is mounted with a second contact (12) that matches the first contact (11); A fixing frame (14) rotatably mounted with a gear (15) is slidably mounted inside the protective shell (8), the gear (15) being meshingly connected to the first rack (13), a second rack (6) meshingly connected to the gear (15) is fixedly mounted on the inner bottom plate of the protective shell (8), a second magnet (10) is mounted on one end of the protective shell (8) near the sliding hole (7), a first electromagnet (9) cooperating with the second magnet (10) is mounted on the fixing frame (14), and an insulating elastic member (4) is arranged between the fixing frame (14) and the inner wall of the protective shell (8), when the first electromagnet (9) and the second magnet (10) are energized, the first electromagnet (9) and the second magnet (10) repel each other with the same polarity so that the insulating elastic member (4) is in a stretched state.

2. The gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: A guide groove (3) is provided on both sides of the fixing frame (14) and on the inner wall of the protective shell (8), and a fixing shaft (5) embedded in the guide groove (3) is provided on the fixing frame (14).

3. The gas-insulated metal-enclosed switchgear according to claim 2, characterized in that: The insulating elastic parts (4) are respectively arranged on both sides of the fixing frame (14) and between the fixing shaft (5) and the inner wall of the protective shell (8).

4. The gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: When the first electromagnet (9) and the second magnet (10) are powered off, the insulating elastic member (4) is in a contracted state.

5. The gas-insulated metal-enclosed switchgear according to claim 1, characterized in that: Two protective shells (8) located at the same height form a protective shell group, and a plurality of protective shell groups are arranged at equal intervals along the length direction of the box body (1).

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