A pneumatic disconnector

Abstract

The utility model discloses a kind of pneumatic disconnecting switch, including base and switch unit;Transmission shaft is installed on base, transmission arm is equipped on transmission shaft;Switch unit includes incoming line insulator, outgoing line insulator, incoming line terminal, outgoing line terminal, conducting rod and transmission insulator, incoming line insulator and outgoing line insulator are respectively fixed on base, incoming line terminal is fixed on incoming line insulator, incoming line terminal is equipped with conducting rod mounting piece, outgoing line terminal is fixed on outgoing line insulator, outgoing line terminal is equipped with static contact conducting sheet, the upper end of static contact conducting sheet is equipped with low friction resistance guide head, conducting rod includes two moving contact conducting sheets, one end of two moving contact conducting sheets is hinged in the two sides of conducting rod mounting piece, the other end of two moving contact conducting sheets can be clamped in the two sides of static contact conducting sheet, transmission insulator is hinged between transmission arm and two moving contact conducting sheets. The utility model can reduce the wear between moving contact and static contact, improve service life.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, specifically to a pneumatic disconnect switch. Background Technology

[0002] Pneumatic disconnect switches utilize the connection between the cylinder output shaft and the transmission shaft to convert the cylinder's opening and closing motions into a 90° rotational motion of the transmission shaft, thereby enabling the conductive rod mounted on the transmission shaft to perform opening and closing motions.

[0003] When existing pneumatic disconnect switches are closed, the moving contact of the conductive rod and the stationary contact of the outgoing terminal need to be clamped together to ensure good conductivity. However, the moving and stationary contacts are generally made of metal, and the direct contact and clamping between the metals leads to greater wear between the moving and stationary contacts during the closing process, which affects the service life of the pneumatic disconnect switch. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pneumatic disconnect switch to reduce wear between the moving and stationary contacts and improve service life.

[0005] This utility model provides a pneumatic disconnect switch, including a base and at least one set of switch units mounted on the base;

[0006] The base is equipped with a drive shaft and a pneumatic unit for driving the drive shaft to rotate. The drive shaft is provided with a drive arm corresponding to each of the switch units.

[0007] The switching unit includes an inlet insulator, an outlet insulator, an inlet terminal, an outlet terminal, a conductive rod, and a transmission insulator. The inlet insulator and the outlet insulator are respectively fixed on the base. The inlet terminal is fixed on the inlet insulator and has a conductive rod mounting plate. The outlet terminal is fixed on the outlet insulator and has a stationary contact conductive plate. The upper end of the stationary contact conductive plate has a low-friction guide head protruding from both sides of the stationary contact conductive plate. The conductive rod includes two opposing moving contact conductive plates. One end of the two moving contact conductive plates is hinged to both sides of the conductive rod mounting plate, and the other end of the two moving contact conductive plates can pass through the low-friction guide head and be clamped to both sides of the stationary contact conductive plate. One end of the transmission insulator is hinged to the transmission arm, and the other end of the transmission insulator is hinged between the middle of the two moving contact conductive plates.

[0008] Furthermore, the upper end of the stationary contact conductive sheet is provided with a T-shaped locking head extending along its width direction, and the low friction guide head is provided with a T-shaped locking groove penetrating both ends therethrough, and the T-shaped locking head engages with the T-shaped locking groove.

[0009] Furthermore, the low-friction guide head is made of impregnated modified graphite.

[0010] Furthermore, the two moving contact conductive sheets are provided with guide portions on the lower side of the end near the output terminal, and a guide opening that gradually expands from top to bottom is formed between the two guide portions.

[0011] Furthermore, the conductive rod also includes an elastic clamping element, which includes a screw, two nuts, and two springs;

[0012] The two moving contact conductive plates have openings near the output terminals. The screw passes through the openings on the two moving contact conductive plates. The two nuts are threaded to both ends of the screw. The two springs are respectively sleeved on both ends of the screw and supported between the moving contact conductive plates and nuts at the corresponding ends.

[0013] Furthermore, the base includes two longitudinal beams arranged opposite each other on the left and right, and two crossbeams arranged opposite each other in front and behind and fixed between the two longitudinal beams. The drive shaft is located between the two crossbeams, and both ends of the drive shaft are rotatably connected to the longitudinal beams on both sides. Each of the inlet insulators and outlet insulators is fixed on the two crossbeams, and each of the two longitudinal beams is provided with mounting holes.

[0014] Furthermore, the pneumatic unit is a telescopic cylinder, and a drive arm is provided on the transmission shaft. One end of the telescopic cylinder is hinged to a crossbeam on one side of the base, and the other end of the telescopic cylinder is hinged to the drive arm.

[0015] Furthermore, the switching unit is provided with three sets.

[0016] The beneficial effects of this utility model are reflected in:

[0017] This invention uses a pneumatic unit to drive a transmission shaft to rotate, which in turn drives a transmission insulator via a transmission arm to rotate a conductive rod, thus achieving opening and closing. During closing, the conductive rod moves towards the stationary contact conductive plate. The two moving contact conductive plates first contact the low-friction guide head at the upper end of the stationary contact conductive plate. The low-friction guide head spreads the two moving contact conductive plates apart. After passing the low-friction guide head, the two moving contact conductive plates are clamped to both sides of the stationary contact conductive plate under the action of elastic force. Because the low-friction guide head protrudes from both sides of the stationary contact conductive plate, there is no contact between the two moving contact conductive plates and the stationary contact conductive plate during the process of the low-friction guide head guiding the two moving contact conductive plates. There is virtually no wear between the two moving contact conductive plates and the stationary contact conductive plate. Simultaneously, the low-friction guide head has low friction, resulting in minimal wear between the low-friction guide head and the two moving contact conductive plates during this process. This design reduces wear between the moving and stationary contacts, improving service life. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is an isometric view of the upper part of an embodiment of the present utility model;

[0020] Figure 2 This is a lower isometric schematic diagram of an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the base in an embodiment of the present utility model;

[0022] Figure 4 This is a schematic diagram of the switching unit in an embodiment of the present invention;

[0023] Figure 5 This is an exploded view of the switching unit according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the output terminal in an embodiment of this utility model.

[0025] In the attached diagram, 100-base; 110-longitudinal beam; 111-mounting hole; 120-crossbeam; 200-switch unit; 210-inlet insulator; 220-outlet insulator; 230-inlet terminal; 231-conductive rod mounting plate; 240-outlet terminal; 241-stationary contact conductive plate; 2411-T-type clamp; 242-low friction guide head; 2421-T-type slot; 250-conductive rod; 251-moving contact conductive plate; 2511-guide part; 252-elastic clamping element; 2521-screw; 2522-nut; 2523-spring; 260-transmission insulator; 300-transmission shaft; 310-transmission arm; 320-drive arm; 400-telescopic cylinder. Detailed Implementation

[0026] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0027] like Figures 1-6 As shown, this utility model embodiment provides a pneumatic disconnect switch, including a base 100 and at least one set of switch units 200 mounted on the base 100.

[0028] In this embodiment, the switch unit 200 is provided with three sets, which correspond to the A-phase, B-phase, and C-phase lines in the three-phase circuit, respectively.

[0029] A drive shaft 300 and a pneumatic unit for driving the drive shaft 300 to rotate are mounted on the base 100. A drive arm 310 is provided on the drive shaft 300 corresponding to each switch unit 200.

[0030] Reference Figure 1 and Figure 4 The switch unit 200 includes an inlet insulator 210, an outlet insulator 220, an inlet terminal 230, an outlet terminal 240, a conductive rod 250, and a transmission insulator 260. The inlet insulator 210 and the outlet insulator 220 are respectively fixed on the base 100. The inlet terminal 230 is fixed on the inlet insulator 210 and has a conductive rod mounting plate 231. The outlet terminal 240 is fixed on the outlet insulator 220 and has a stationary contact conductive plate 241. The upper end of the stationary contact conductive plate 241... The conductive rod 250 is provided with low-friction guide heads 242 protruding from both sides of the stationary contact conductive sheet 241. The conductive rod 250 includes two oppositely arranged moving contact conductive sheets 251. One end of the two moving contact conductive sheets 251 is hinged to both sides of the conductive rod mounting plate 231. The other end of the two moving contact conductive sheets 251 can pass through the low-friction guide heads 242 and be clamped on both sides of the stationary contact conductive sheet 241. One end of the transmission insulator 260 is hinged to the transmission arm 310, and the other end of the transmission insulator 260 is hinged between the middle parts of the two moving contact conductive sheets 251.

[0031] In this embodiment, refer to Figure 2 and Figure 3 The base 100 includes two longitudinal beams 110 arranged opposite each other on the left and right, and two cross beams 120 arranged opposite each other in front and behind and fixed between the two longitudinal beams 110. The drive shaft 300 is located between the two cross beams 120, and the two ends of the drive shaft 300 are rotatably connected to the longitudinal beams 110 on both sides respectively. Each inlet insulator 210 and outlet insulator 220 is fixed on the two cross beams 120 respectively. Both longitudinal beams 110 are provided with mounting holes 111 to facilitate fixing the base 100 to the mounting base.

[0032] The pneumatic unit is a telescopic cylinder 400. A drive arm 320 is provided on the drive shaft 300. One end of the telescopic cylinder 400 is hinged to the crossbeam 120 on one side of the base 100, and the other end of the telescopic cylinder 400 is hinged to the drive arm 320. In this way, the rotation of the drive shaft 300 can be controlled by controlling the extension and retraction of the telescopic cylinder 400.

[0033] It is understood that in other embodiments, the pneumatic unit may also be a rotary cylinder.

[0034] The low-friction guide head 242 is prone to wear, see reference. Figure 6 In order to facilitate the replacement of the worn low-friction guide head 242, the upper end of the stationary contact conductive sheet 241 is provided with a T-shaped clip 2411 extending along its width direction, and the low-friction guide head 242 is provided with a T-shaped slot 2421 passing through both ends of it, and the T-shaped clip 2411 and the T-shaped slot 2421 are engaged and matched.

[0035] In this embodiment, the low-friction guide head 242 is made of impregnated modified graphite. Impregnated modified graphite not only has low friction but also high compressive strength, flexural strength, and tensile strength.

[0036] To ensure that the stationary contact conductive piece 241 can smoothly engage between the two moving contact conductive pieces 251 when the circuit is closed, a guide portion 2511 is provided on the lower side of the two moving contact conductive pieces 251 near the end of the outgoing terminal 240, and a guide opening that gradually expands from top to bottom is formed between the two guide portions 2511.

[0037] Reference Figure 5 The conductive rod 250 also includes an elastic clamping member 252, which includes a screw 2521, two nuts 2522 and two springs 2523.

[0038] Two moving contact conductive plates 251 have openings near the output terminal 240. A screw 2521 passes through the openings on the two moving contact conductive plates 251. Two nuts 2522 are threaded to both ends of the screw 2521. Two springs 2523 are respectively sleeved on both ends of the screw 2521 and supported between the moving contact conductive plates 251 and the nuts 2522 at the corresponding ends. In this way, the springs 2523 on both sides can provide a clamping force towards the middle for the two moving contact conductive plates 251, ensuring that the two moving contact conductive plates 251 can be clamped on both sides of the stationary contact conductive plate 241 after the circuit is closed.

[0039] This utility model can drive the transmission shaft 300 to rotate via a pneumatic unit, and the transmission shaft 300 then drives the transmission insulator 260 to rotate via the transmission arm 310, thereby realizing the opening and closing of the circuit breaker. When the circuit is closed, the conductive rod 250 moves toward the stationary contact conductive piece 241. The two moving contact conductive pieces 251 of the conductive rod 250 first contact the low-friction guide head 242 at the upper end of the stationary contact conductive piece 241. The low-friction guide head 242 spreads the two moving contact conductive pieces 251 apart. After passing the low-friction guide head 242, the two moving contact conductive pieces 251 are clamped on both sides of the stationary contact conductive piece 241 under the action of elasticity. Since the low-friction guide head 242 protrudes from both sides of the stationary contact conductive piece 241, there is no contact between the two moving contact conductive pieces 251 and the stationary contact conductive piece 241 during the process of the low-friction guide head 242 guiding the two moving contact conductive pieces 251. There is basically no wear between the two moving contact conductive pieces 251 and the stationary contact conductive piece 241. At the same time, the friction of the low-friction guide head 242 is low, and the wear between the low-friction guide head 242 and the two moving contact conductive pieces 251 is also relatively low during this process. This design reduces wear between the moving and stationary contacts, thus extending their service life.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A pneumatic disconnect switch, characterized in that: Includes a base and at least one set of switch units mounted on the base; The base is equipped with a drive shaft and a pneumatic unit for driving the drive shaft to rotate. The drive shaft is provided with a drive arm corresponding to each of the switch units. The switching unit includes an inlet insulator, an outlet insulator, an inlet terminal, an outlet terminal, a conductive rod, and a transmission insulator. The inlet insulator and the outlet insulator are respectively fixed on the base. The inlet terminal is fixed on the inlet insulator and has a conductive rod mounting plate. The outlet terminal is fixed on the outlet insulator and has a stationary contact conductive plate. The upper end of the stationary contact conductive plate has a low-friction guide head protruding from both sides of the stationary contact conductive plate. The conductive rod includes two opposing moving contact conductive plates. One end of the two moving contact conductive plates is hinged to both sides of the conductive rod mounting plate, and the other end of the two moving contact conductive plates can pass through the low-friction guide head and be clamped to both sides of the stationary contact conductive plate. One end of the transmission insulator is hinged to the transmission arm, and the other end of the transmission insulator is hinged between the middle of the two moving contact conductive plates.

2. The pneumatic disconnect switch according to claim 1, characterized in that: The upper end of the stationary contact conductive sheet is provided with a T-shaped locking head extending along its width direction, and the low friction guide head is provided with a T-shaped locking groove penetrating both ends thereto, and the T-shaped locking head and the T-shaped locking groove are engaged and matched.

3. The pneumatic disconnect switch according to claim 1, characterized in that: The low-friction guide head is made of impregnated modified graphite.

4. The pneumatic disconnect switch according to claim 1, characterized in that: The two moving contact conductive sheets are provided with guide portions on the lower side of the end near the output terminal, and a guide opening that gradually expands from top to bottom is formed between the two guide portions.

5. The pneumatic disconnect switch according to claim 1, characterized in that: The conductive rod also includes an elastic clamping component, which includes a screw, two nuts, and two springs. The two moving contact conductive plates have openings near the output terminals. The screw passes through the openings on the two moving contact conductive plates. The two nuts are threaded to both ends of the screw. The two springs are respectively sleeved on both ends of the screw and supported between the moving contact conductive plates and nuts at the corresponding ends.

6. The pneumatic disconnect switch according to claim 1, characterized in that: The base includes two longitudinal beams arranged opposite each other on the left and right, and two cross beams arranged opposite each other in front and behind and fixed between the two longitudinal beams. The drive shaft is located between the two cross beams, and both ends of the drive shaft are rotatably connected to the longitudinal beams on both sides. Each of the inlet insulators and outlet insulators is fixed on the two cross beams. Mounting holes are provided on both longitudinal beams.

7. The pneumatic disconnect switch according to claim 6, characterized in that: The pneumatic unit is a telescopic cylinder, and a drive arm is provided on the drive shaft. One end of the telescopic cylinder is hinged to a crossbeam on one side of the base, and the other end of the telescopic cylinder is hinged to the drive arm.

8. The pneumatic disconnect switch according to any one of claims 1-7, characterized in that: The switch unit has three sets.

Images