Compact air insulation disconnecting switch

Abstract

The utility model relates to the technical field of switches, and discloses a compact air-insulated isolating switch, which comprises a support, a ground knife assembly, a moving knife assembly, an isolating rotating shaft assembly and a static contact isolating assembly, and is characterized in that the isolating rotating shaft assembly and the ground knife assembly are both mounted at the lower end of the support; the static contact isolation assembly is installed at the upper end of the support, the corner end of the moving knife assembly is rotationally connected with the isolation rotating shaft assembly, one end of the moving knife assembly is rotationally connected with the support, and the other end of the moving knife assembly is matched with the static contact isolation assembly and the grounding knife assembly. According to the utility model, the insulation performance between the isolation moving contacts of the moving knife assembly is improved, the insulation performance of the isolation upper static contact of the static contact isolation assembly is improved, the size of the isolation switch can be effectively reduced, the test effect of short-time withstand current and peak current of the isolation switch is improved, and the isolation switch can meet the 10KV interphase insulation requirement in the air.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a compact air-insulated isolating switch. Background Art

[0002] The isolating switch has a closed position, an open position, and an earthing position. Therefore, the isolating switch integrates the functions of both an isolating switch and an earthing switch. The isolating switch can be mechanically locked to prevent the earthing switch from closing when the main circuit is energized, thus avoiding misoperation.

[0003] A certain distance needs to be maintained between the isolating moving contacts of the isolating switch to achieve air insulation. However, due to the certain distance between the isolating moving contacts, the isolating switch cannot be compressed after reaching a certain volume. At present, the isolating switches on the market use open-mold plastic support beams for the isolation base plate of the upper static contact, with embedded metal to increase strength. Plastic parts are prone to cracking, and embedded metal parts reduce insulation. Plastic covers are used between phases to increase phase insulation. Plastic parts are prone to deformation at high temperatures, and are prone to brittleness or cracking due to weathering over a long period of time. If air insulation is used, the size of the isolating switch will also be too large. The engineering plastics used in the isolating knife switch connecting rod have certain risks during short-term current withstand tests. Plastic parts are prone to deformation at high temperatures, resulting in the knife switch being unable to reset normally after the test. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the above prior art and to provide a compact air-insulated disconnect switch.

[0005] The purpose of the present utility model is achieved through the following technical solutions: A compact air-insulated isolating switch includes a bracket, a ground knife assembly, a moving knife assembly, an isolating shaft assembly and a static contact isolation assembly, the moving knife assembly includes a pressure equalizing cover, a bolt, a spring assembly, an isolating moving contact, a triangular connector and a support sleeve, the isolating shaft assembly and the ground knife assembly are both installed at the lower end of the bracket, the static contact isolation assembly is installed at the upper end of the bracket, the angle end of the triangular connector is rotatably connected to the isolating shaft assembly, the straight side ends of the triangular connector are respectively connected to the isolating moving contact through a fixed shaft, the support sleeve is installed between the two isolating moving contacts through a bolt, the support sleeve at one end of the isolating moving contact is rotatably connected to the bracket, both ends of the bolt pass through the spring assembly to be connected to the pressure equalizing cover, and the other end of the isolating moving contact is respectively matched with the static contact isolation assembly and the ground knife assembly.

[0006] More preferably, the other end of the isolating movable contact is provided with a protrusion, and the protrusion matches the static contact isolation assembly and the ground knife assembly respectively.

[0007] A better choice is that the static contact isolation assembly includes an isolation plate, an isolation base plate, a top expansion connector and an isolation upper static contact, the two ends of the isolation base plate are installed on the upper end of the bracket, the isolation plate is installed on the top of the isolation base plate, the isolation upper static contact is installed between two adjacent isolation plates, the isolation upper static contact passes through the isolation base plate and matches the other end of the isolation moving contact, and the top expansion connector is installed on the isolation upper static contact.

[0008] More preferably, the thickness of the isolation plate ranges from 7 to 9 mm.

[0009] More preferably, the isolation plate is made of epoxy resin.

[0010] More preferably, the thickness of the isolation bottom plate ranges from 11 to 13 mm.

[0011] More preferably, the isolation plate is higher than the top expansion connector, and the height difference between the isolation plate and the top expansion connector ranges from 81 to 85 mm.

[0012] A better choice is that the ground knife assembly includes a ground knife frame, a grounding contact and a grounding connection plate, the grounding contact is installed on the grounding connection plate, the grounding connection plate is installed on the ground knife frame, the two ends of the ground knife frame are connected to the lower end of the bracket, and the grounding contact is matched with the isolating moving contact.

[0013] A better choice is that the isolation shaft assembly includes a hexagonal shaft, a hexagonal arm and a transmission rod, both ends of the hexagonal shaft are installed on the lower end of the bracket, one end of the hexagonal arm is fixedly connected to the hexagonal shaft, the other end of the hexagonal arm is rotatably connected to one end of the transmission rod, and the other end of the transmission rod is rotatably connected to the triangular connector.

[0014] A better choice is that the bracket includes a first support plate, an isolation support frame, a second support plate and an isolation lower static contact, the first support plate and the second support plate are installed at both ends of the isolation support frame, the upper end of the isolation lower static contact matches the isolation moving contact, and the lower end of the isolation lower static contact passes through the isolation support frame.

[0015] A better choice is that the spring assembly includes multiple disc springs and contact pressure springs, both ends of the bolt pass through the contact pressure springs, both ends of the contact pressure springs respectively abut against the isolating moving contact and the pressure equalizing cover, multiple disc springs are sleeved on the contact pressure springs, and multiple disc springs are stacked in sequence to form a disc spring assembly, and both ends of the disc spring assembly respectively abut against the isolating moving contact and the pressure equalizing cover.

[0016] The present invention has the following advantages and beneficial effects compared to the prior art:

[0017] The utility model improves the insulation performance between the isolated moving contacts of the movable knife assembly and the insulation performance of the isolated static contacts of the static contact isolation assembly through the bracket, the ground knife assembly, the movable knife assembly, the isolation shaft assembly and the static contact isolation assembly, can effectively reduce the volume of the isolating switch, and improve the short-time withstand current and peak current test results of the isolating switch, and can meet the 10KV phase-to-phase insulation requirements in the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a compact air-insulated disconnector of the utility model;

[0019] Figure 2 It is a schematic diagram of a compact air-insulated disconnector of the utility model;

[0020] Figure 3 This is a schematic diagram of a bracket of a compact air-insulated disconnector of the present invention;

[0021] Figure 4 This is a schematic diagram of a grounding knife assembly of a compact air-insulated disconnector of the present invention;

[0022] Figure 5 This is a schematic diagram of a movable blade assembly of a compact air-insulated disconnector of the present utility model;

[0023] Figure 6 This is a side view of a movable blade assembly of a compact air-insulated disconnector of the present utility model;

[0024] Figure 7 yes Figure 6 A cross-sectional view at point A;

[0025] Figure 8 This is a schematic diagram of an isolating movable contact of a compact air-insulated isolating switch of the present utility model;

[0026] Figure 9 This is a schematic diagram of an isolation shaft assembly of a compact air-insulated disconnector switch of the present invention;

[0027] Components in the drawings are marked as follows: 1-bracket; 101-first support plate; 102-isolating support frame; 103-second support plate; 104-isolating lower static contact; 2-ground knife assembly; 201-ground knife frame; 202-ground contact; 203-ground connection plate; 3-moving knife assembly; 301-voltage grading cover; 302-bolt; 303-isolating moving contact; 303a-groove; 303b-bump; 304-disc Spring; 305-triangular connector; 306-fixed shaft; 307-contact pressure spring; 308-support sleeve; 4-isolation shaft assembly; 401-hexagonal shaft; 402-hexagonal arm; 403-first insulating pin; 404-transmission rod; 405-second insulating pin; 5-static contact isolation assembly; 501-isolation plate; 502-isolation bottom plate; 503-top expansion connector; 504-isolation upper static contact. DETAILED DESCRIPTION

[0028] The utility model object of the utility model is further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the implementation methods of the utility model are not limited to the following embodiments.

[0029] like Figure 1 and 2 As shown, a compact air-insulated disconnect switch includes a bracket 1, a grounding knife assembly 2, three sets of movable knife assemblies 3, an isolating shaft assembly 4, and a static contact isolating assembly 5. The static contact isolating assembly 5 is mounted on the top of the bracket 1, the isolating shaft assembly 4 is mounted on the lower front end of the bracket 1, and the grounding knife assembly 2 is mounted on the lower rear end of the bracket 1. The middle portion of the movable knife assembly 3 is hinged to the static contact isolating assembly 5, and the lower end of the movable knife assembly 3 is hinged to the bracket 1. When the middle portion of the movable knife assembly 3 is driven inward by the isolating shaft assembly 4, the lower end of the movable knife assembly 3 rotates around the bracket 1, and the upper end of the static contact isolating assembly 5 is connected to the movable knife assembly 3. When the middle portion of the movable knife assembly 3 is driven outward by the isolating shaft assembly 4, the lower end of the movable knife assembly 3 rotates around the bracket 1, and the upper end of the movable knife assembly 3 is connected to the grounding knife assembly 2. The bracket 1 provides support and is used to connect to external circuits. The grounding knife assembly 2 is used to connect to external circuits and can be connected to the movable knife assembly 3. The movable knife assembly 3 is used to connect to one of the static contact isolation assembly 5 and the ground knife assembly 2. The isolation shaft assembly 4 is used to drive the movable knife assembly 3 to rotate outward or inward. The static contact isolation assembly 5 is used to connect to the external circuit.

[0030] like Figure 3As shown, the bracket 1 includes a first support plate 101, an isolation support frame 102, a second support plate 103, and three isolation lower static contacts 104. The isolation support frame 102 is perpendicularly connected to the first and second support plates 101, 103 at both ends. The first and second support plates 101, 103 are parallel to each other. The three isolation lower static contacts 104 are mounted on the isolation support frame 102 and pass through the isolation support frame 102. The upper ends of the three isolation lower static contacts 104 are hinged to one end of the three isolation movable contacts 303 of the movable blade assembly 3.

[0031] The first support plate 101 and the second support plate 103 provide support. The isolation support frame 102 is used to strengthen the first support plate 101 and the second support plate 103 and to secure three isolation lower static contacts 104. The isolation lower static contacts 104 are used to connect to external circuits and achieve electrical connection with the isolation movable contact 303.

[0032] like Figure 3 As shown, the static contact isolation assembly 5 includes four isolation plates 501, an isolation base plate 502, three top expansion connectors 503 and three isolation upper static contacts 504. One end of the isolation base plate 502 is mounted on the upper end of the first support plate 101 of the bracket 1, and the other end of the isolation base plate 502 is mounted on the upper end of the second support plate 103. The three isolation upper static contacts 504 are mounted on the isolation base plate 502 and pass through the isolation base plate 502. The lower ends of the three isolation upper static contacts 504 correspond to the three groups of isolation moving contacts 303 of the movable knife assembly 3 respectively. The three top expansion connectors 503 are mounted on the top of the three isolation upper static contacts 504. The four isolation plates 501 separate the three isolation upper static contacts 504.

[0033] The isolation base plate 502 is made of epoxy board, with dimensions of 594mm (length) * 220mm (width) and a thickness of 12±1mm. It serves as an insulator and can meet not only the strength requirements of the isolating switch, but also the insulation requirements of a 10KV switch. The isolation plate 501 is also made of epoxy board, which serves as an insulator. Its dimensions are 135mm (length) * 130mm (width) and a thickness of 8±1mm. It increases the creepage distance between phases. The height of the isolation plate 501 is 83±2mm higher than the isolation upper static contact 504, so that it meets the insulation requirements of a 10KV switch when the phase distance is 150mm. The top expansion connector 503 is used to increase the connection method of the isolation upper static contact 504. The isolation upper static contact 504 is used to connect to the isolation moving contact 303 of the moving knife assembly 3.

[0034] like Figure 4As shown, the ground knife assembly 2 includes a ground knife frame 201, three grounding contacts 202, and a ground connection plate 203. The three grounding contacts 202 are mounted on the ground connection plate 203, which is mounted on the ground knife frame 201. The two ends of the ground knife frame 201 are connected to the lower end of the bracket 1. The ground knife frame 201 is located on the rear side of the bracket 1. The three grounding contacts 202 face the inside of the bracket 1 and correspond one-to-one with the three isolating movable contacts 303 of the movable knife assembly 3.

[0035] The grounding plate 201 is used to enhance the connection strength between the first support plate 101 and the second support plate 103 and to install the grounding connection plate 203 ; the grounding contacts 202 are used to connect to external circuits; and the grounding connection plate 203 is used to evenly distribute the grounding contacts 202 .

[0036] like Figure 5-8 As shown, each movable blade assembly 3 includes four pressure-equalizing covers 301, two bolts 302, four spring assemblies, two isolating movable contacts 303, two fixed shafts 306, a triangular connector 305, and two support sleeves 308. Each spring assembly includes a contact pressure spring 307 and four disc springs 304. The triangular connector 305 has an angle end and a straight end. The angle end is rotatably connected to one end of the transmission rod 404 of the isolating rotating shaft assembly 4 via a second insulating pin 405. The two fixed shafts 306 are mounted on the straight end. The two ends of the two fixed shafts 306 are respectively connected to the two isolating movable contacts 303. The two ends of the two isolating movable contacts 303 protrude from the straight ends of the triangular connector 305. The two support sleeves 308 are respectively mounted on the two ends of the isolating movable contacts 303 via two bolts 302. The lower isolating static contact 104 of the bracket 1 is sleeved onto one of the support sleeves 308 and can rotate relative to the support sleeve 308. A groove 303a is formed at the end of the isolating movable contact 303 away from the lower isolating static contact 104, with a protrusion 303b on either side of the groove 303a. Both ends of the bolt 302 pass through the isolating movable contact 303 and through the contact pressure spring 307 to connect to the voltage grading cover 301. Four disc springs 304 are sleeved onto the contact pressure spring 307. The four disc springs 304 are stacked in sequence to form a disc spring assembly. The ends of the disc spring assembly abut against the isolating movable contact 303 and the voltage grading cover 301, respectively. The ends of the contact pressure spring 307 abut against the isolating movable contact 303 and the voltage grading cover 301, respectively. One end of the isolating movable contact 303 provided with a protrusion 303 b corresponds to the isolating upper static contact 504 of the static contact isolation assembly 5 and the grounding contact 202 of the ground knife assembly 2 respectively.

[0037] The voltage-equalizing cover 301 solves the problem of insufficient phase distance by adjusting the electric field distribution, effectively preventing arc discharge and insulation breakdown. Bolts 302 are used to install the spring assembly, support sleeve 308 and voltage-equalizing cover 301 on the isolating moving contact 303. The spring assembly allows the voltage-equalizing cover 301 to maintain a certain distance from the isolating moving contact 303, thereby improving the insulation performance of the isolating moving contact 303. The isolating moving contact 303 is used to electrically connect to the grounding contact 202 of the ground knife assembly 2 and the isolating upper static contact 504 of the static contact isolation assembly 5. The fixed shaft 306 is used to install the isolating moving contact 303 on the triangular connector 305. The triangular connector 305 plays a connecting and transmission role. The support sleeve 308 is used to ensure that the two isolating moving contacts 303 maintain a certain distance, allowing the grounding contact 202 and the isolating upper static contact 504 to be clamped between the two isolating moving contacts 303. The contact pressure spring 307 is used to ensure that the isolation movable contact 303 maintains a certain distance from the voltage grading cover 301. The disc spring 304 is used to ensure that the isolation movable contact 303 is parallel to the voltage grading cover 301, thereby improving the insulation performance of the isolation movable contact 303.

[0038] like Figure 9 As shown, the isolated shaft assembly 4 includes a hexagonal shaft 401, three hexagonal arms 402, three transmission rods 404, three first insulating pins 403, and three second insulating pins 405. One end of the hexagonal shaft 401 is rotatably connected to the first support plate 101 of the bracket 1, while the other end of the hexagonal shaft 401 is rotatably connected to the second support plate 103 of the bracket 1. One end of the three hexagonal arms 402 is fixedly connected to the hexagonal shaft 401, while the other ends of the three hexagonal arms 402 are hingedly connected to one end of the transmission rod 404 via the first insulating pin 403. The other ends of the three transmission rods 404 are hingedly connected to the triangular connector 305 via the second insulating pin 405.

[0039] The hexagonal shaft 401 plays a transmission role, and after receiving power, it will drive the hexagonal arm 402 to rotate around the hexagonal shaft 401. The hexagonal arm 402 and the transmission rod 404 both play a transmission role and change the transmission direction of the power.

[0040] The compact air-insulated disconnector operates as follows: When the hexagonal rotating shaft 401 is driven clockwise, it in turn drives the hexagonal rotating arm 402 and the transmission rod 404 to rotate outward. The transmission rod 404 pulls the central portion of the movable blade assembly 3 outward. Because the lower end of the movable blade assembly 3 is hinged to the bracket 1, the movable blade assembly 3 can only rotate about the isolation support frame 102 of the bracket 1, thereby allowing the upper end of the movable blade assembly 3 to move upward. The upper end of the isolating movable contact 303 of the movable blade assembly 3 connects to the upper isolating static contact 504 of the static contact isolation assembly 5, thereby establishing communication between the circuit connected to the upper isolating static contact 504 and the circuit connected to the lower isolating static contact 104. When the hexagonal shaft 401 is driven counterclockwise, it sequentially drives the hexagonal arm 402 and the transmission rod 404 inward. The transmission rod 404 pulls the middle portion of the movable knife assembly 3 inward. Because the lower end of the movable knife assembly 3 is hinged to the bracket 1, the movable knife assembly 3 can only rotate about the isolation support frame 102 of the bracket 1, thereby allowing the upper end of the movable knife assembly 3 to move downward. The upper end of the isolation movable contact 303 of the movable knife assembly 3 is connected to the grounding contact 202 of the ground knife assembly 2, thereby establishing communication between the circuit connected to the isolation upper static contact 504 and the circuit connected to the isolation lower static contact 104.

[0041] The above specific implementation methods are preferred embodiments of the present invention and cannot limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the scope of protection of the present invention.

Claims

1. A compact air-insulated disconnector, characterized in that: It includes a bracket, a ground knife assembly, a moving knife assembly, an isolation shaft assembly and a static contact isolation assembly. The moving knife assembly includes a pressure equalizing cover, a bolt, a spring assembly, an isolation moving contact, a triangular connector and a support sleeve. The isolation shaft assembly and the ground knife assembly are both installed at the lower end of the bracket, and the static contact isolation assembly is installed at the upper end of the bracket. The angle end of the triangular connector is rotatably connected to the isolation shaft assembly, and the straight side ends of the triangular connector are respectively connected to the isolation moving contact through a fixed shaft. The support sleeve is installed at both ends of the isolation moving contact through a bolt. The support sleeve at one end of the isolation moving contact is rotatably connected to the bracket, and the other end of the isolation moving contact is provided with a bump. Both ends of the bolt pass through the spring assembly to be connected to the pressure equalizing cover, and the other end of the isolation moving contact is matched with the static contact isolation assembly and the ground knife assembly respectively.

2. A compact air-insulated disconnector according to claim 1, characterized in that: The static contact isolation assembly includes an isolation plate, an isolation base plate, a top expansion connector and an isolation upper static contact. The two ends of the isolation base plate are installed on the upper end of the bracket, the isolation plate is installed on the top of the isolation base plate, the isolation upper static contact is installed between two adjacent isolation plates, the isolation upper static contact passes through the isolation base plate and matches the other end of the isolation moving contact, and the top expansion connector is installed on the isolation upper static contact.

3. The compact air-insulated disconnector according to claim 2, characterized in that: The isolation plate and the isolation plate are both made of epoxy resin.

4. The compact air-insulated disconnector according to claim 3, characterized in that: The thickness of the isolation plate ranges from 7 to 9 mm.

5. The compact air-insulated disconnector according to claim 3, characterized in that: The thickness of the isolation bottom plate ranges from 11 to 13 mm.

6. The compact air-insulated disconnector according to claim 2, characterized in that: The isolation plate is higher than the top expansion connector, and the height difference between the isolation plate and the top expansion connector is in the range of 81 to 85 mm.

7. The compact air-insulated disconnector according to claim 1, characterized in that: The ground knife assembly includes a ground knife frame, a grounding contact and a grounding connection plate. The grounding contact is installed on the grounding connection plate, and the grounding connection plate is installed on the ground knife frame. The two ends of the ground knife frame are connected to the lower end of the bracket, and the grounding contact matches the other end of the isolating moving contact.

8. The compact air-insulated disconnector according to claim 1, characterized in that: The isolation shaft assembly includes a hexagonal shaft, a hexagonal arm and a transmission rod. The two ends of the hexagonal shaft are rotatably mounted on the lower end of the bracket. One end of the hexagonal arm is fixedly connected to the hexagonal shaft, the other end of the hexagonal arm is rotatably connected to one end of the transmission rod, and the other end of the transmission rod is rotatably connected to the triangular connector.

9. The compact air-insulated disconnector according to claim 1, characterized in that: The bracket includes a first support plate, an isolation support frame, a second support plate and an isolation lower static contact. The first support plate and the second support plate are respectively installed at both ends of the isolation support frame. The upper end of the isolation lower static contact matches the other end of the isolation moving contact, and the lower end of the isolation lower static contact passes through the isolation support frame.

10. The compact air-insulated disconnector according to claim 1, characterized in that: The spring assembly includes multiple disc springs and contact pressure springs, both ends of the bolt pass through the contact pressure springs, and both ends of the contact pressure springs respectively abut against the isolating moving contact and the pressure equalizing cover, and multiple disc springs are sleeved on the contact pressure springs. Multiple disc springs are stacked in sequence to form a disc spring assembly, and both ends of the disc spring assembly respectively abut against the isolating moving contact and the pressure equalizing cover.

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