Arc-blocking supercharging device of direct-current isolating switch contact system

Abstract

The utility model relates to the field of disconnecting switches, and discloses a direct current disconnecting switch contact system arc blocking supercharging device, which comprises a mounting seat, a first gas blocking cover, a second gas blocking cover, a plurality of pressure springs, a spring piece and a limiting pin, a mounting groove is formed in the inner wall, close to the static contact, of the shell of the direct-current isolating switch; a sliding groove is formed in the side face, close to the static contact, of the mounting base, and pin shaft holes are formed in the two sides of the sliding groove of the mounting base; a waist-shaped hole is formed in the first gas blocking cover; according to the utility model, through the arrangement of the first gas blocking cover and the second gas blocking cover which are elastically telescopic, electric arcs ejected away from the arc extinguish chamber during opening can be blocked, and the arc extinguishing effect is improved.

Description

DC disconnect switch contact system arc-blocking booster device Technical Field

[0001] This utility model relates to the field of disconnecting switches, and in particular to an arc-blocking booster device for DC disconnecting switch contact systems. Background Technology

[0002] A DC disconnect switch is a switching device used in DC circuits to isolate power supplies and switch circuits. It is mainly used in power systems, rail transportation, and new energy fields. Its core functions include completely disconnecting the parts to be isolated from the power supply during equipment maintenance or fault handling, creating a clear disconnection point to ensure the safety of personnel and equipment. Through opening and closing operations, it realizes the switching or changing of DC circuits to meet the needs of adjusting system operation modes.

[0003] Publication number CN210722914U discloses an electronic residual current circuit breaker, including a housing with terminals at both ends. The housing includes a base and a top cover. The base is provided with a moving contact, a stationary contact, a swing rod, a traction rod, and a moving contact operating mechanism. Rotation of the traction rod can drive the moving contact operating mechanism to work. The base is also provided with A-phase current transformers, B-phase current transformers, and C-phase current transformers. The base is provided with mounting slots for installing the current transformers at the corresponding positions of each phase current transformer. The mounting slots are arranged side by side and separated by a partition. Each mounting slot is also provided with a guide groove for the iron core of each phase current transformer to slide into during installation. The top cover is provided with a circuit board. The output terminals of each phase current transformer are electrically connected to the circuit board. The circuit board is connected to an electronic display screen and a control switch for setting the rated current value. The base is also provided with an electromagnetic trip unit that can drive the circuit breaker to trip. However, the above-mentioned circuit breakers still have the following shortcomings: when the circuit is tripped, they cannot block the arc that is ejected in the direction away from the arc-extinguishing chamber, which can easily cause the arc to damage the internal equipment of the circuit breaker. Summary of the Invention

[0004] The purpose of this invention is to provide an arc-blocking booster device for a DC disconnector switch contact system to solve the problems existing in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a DC disconnect switch contact system arc-blocking and pressure-boosting device, including a mounting base, a first gas-blocking cover, a second gas-blocking cover, several compression springs, spring plates, and limit pins; the inner wall of the DC disconnect switch housing near the stationary contact is provided with a mounting groove; the mounting base is provided with a sliding groove on the side near the stationary contact, and the mounting base is provided with pin holes on both sides of the sliding groove; the first gas-blocking cover is provided with an oblong hole; the inner end of the second gas-blocking cover is provided with a sliding part and several receiving grooves.

[0006] The mounting base is fixed on the rotating bracket. The first air baffle is slidably set in the sliding groove. The limiting pin passes through two pin holes and the waist-shaped hole. When the first air baffle slides outward a certain distance, it will be limited by the limiting pin, thereby limiting its sliding range and preventing it from leaving the sliding groove. The spring plate is set in the sliding groove and abuts against the inner end of the first air baffle. The second air baffle is slidably set in the mounting groove. Several compression springs correspond to several receiving grooves. One end of the spring is located in the corresponding receiving groove and abuts against the inner wall of the receiving groove, and the other end abuts against the inner wall of the mounting groove.

[0007] When the circuit is opened, the first and second air baffles extend under the elastic force of the spring plate and the compression spring, respectively. The extended first and second air baffles block the downward arc that is ejected when the moving contact separates from the stationary contact.

[0008] Furthermore, the waist-shaped hole is set along the sliding direction of the first air baffle, thereby limiting its range of movement.

[0009] Furthermore, the outer end of the first air baffle is provided with an arc-shaped contact surface, and the outer end of the second air baffle is provided with a pressure-bearing surface. The pressure-bearing surface is a plane and is perpendicular to the sliding direction of the second air baffle. When the circuit is closed, the contact surface of the first air baffle presses the pressure-bearing surface of the second air baffle. Through bidirectional force, the first air baffle and the second air baffle retract, accumulating elastic potential energy for the subsequent circuit opening process, which helps to improve the circuit opening rate.

[0010] Furthermore, the cross-section of the mounting groove is T-shaped.

[0011] Furthermore, the sliding part and the second air deflector together form a T-shape, and the sliding part is used to prevent the second air deflector from disengaging from the mounting groove.

[0012] Furthermore, the second air baffle is positioned opposite to the first air baffle, and their sliding directions are parallel, so that the second air baffle and the first air baffle can come into contact when the circuit is closed.

[0013] The beneficial effects of this utility model are:

[0014] 1. During opening, the rotating bracket rotates forward, causing the moving contact to separate from the stationary contact. The rotating bracket also moves the mounting base, limit pin, and first air baffle away from the second air baffle. This causes the first and second air baffles to extend under the elastic force of the spring plate and compression spring, respectively. The extended first and second air baffles block the downward-spraying arc when the moving contact separates from the stationary contact. Furthermore, the elastic force of the spring plate and compression spring increases the pressure between the rotating bracket and the housing, allowing the moving contact to separate from the stationary contact more quickly during opening, thus breaking the arc and facilitating its extinguishing, reducing burn damage to the moving and stationary contacts.

[0015] 2. When closing the circuit breaker, the rotating bracket rotates in the opposite direction, causing the moving contact to contact the stationary contact. The rotating bracket also causes the mounting base, limit pin, and first air baffle to approach the second air baffle. The contact surface of the first air baffle presses against the pressure surface of the second air baffle. Through bidirectional force, the first and second air baffles retract, compressing the spring sheet and compression spring. This accumulates elastic potential energy for the subsequent opening process, which helps to improve the opening speed of the opening process. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 is a schematic diagram of the exploded structure of this utility model;

[0018] Figure 3 is an enlarged structural schematic diagram of A in Figure 2 of this utility model;

[0019] Figure 4 is a cross-sectional structural diagram of this utility model;

[0020] Figure 5 is an enlarged structural schematic diagram of B in Figure 4 of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Mounting groove; 2. Arc extinguishing chamber; 3. Contact system; 31. Rotating bracket; 32. Stationary contact; 33. Moving contact; 4. Current transformer; 5. Mounting base; 51. Sliding groove; 52. Pin hole; 6. First gas baffle; 61. Waist-shaped hole; 62. Contact surface; 7. Second gas baffle; 71. Sliding part; 72. Pressure-bearing surface; 73. Receiving groove; 8. Compression spring; 9. Spring plate; 10. Limit pin. Detailed Implementation

[0022] The following will describe the concept and technical effects of this utility model clearly and completely with reference to the embodiments, so as to fully understand the purpose, features and effects of this utility model.

[0023] As shown in Figures 1-5, the arc-extinguishing and pressure-boosting device for the DC disconnector contact system includes a mounting base 5, a first gas-blocking cover 6, a second gas-blocking cover 7, several compression springs 8, spring plates 9, and a limiting pin 10. This utility model is installed inside the housing 1 of the DC disconnector. Inside the housing 1, along its length, are sequentially arranged an arc-extinguishing chamber 2, a contact system 3, and a current transformer 4. The contact system 3 includes a rotating bracket 31, a stationary contact 32, and a moving contact 33. The housing 1 is composed of two half-shells joined together.

[0024] The rotating bracket 31 is rotatably connected to the inner wall of the outer casing 1. The moving contact 33 is fixed to the end of the rotating bracket 31 near the arc-extinguishing chamber 2, and the stationary contact 32 is fixed to the inner wall of the outer casing 1. When the rotating bracket 31 rotates in the forward direction, it causes the moving contact 33 to separate from the stationary contact 32; when it rotates in the reverse direction, it causes the moving contact 33 to contact the stationary contact 32, thereby realizing the opening and closing of the circuit. This utility model is located on the side of the moving contact 33 and the stationary contact 32 away from the arc-extinguishing chamber 2, and close to the moving contact 33 and the stationary contact 32.

[0025] The inner wall of the outer casing 1 near the stationary contact 32 is provided with a mounting groove 11. The side of the mounting base 5 near the stationary contact 32 is provided with a sliding groove 51, and the mounting base 5 is provided with pin holes 52 on both sides of the sliding groove 51. The first air baffle 6 is provided with an oblong hole 61. The inner end of the second air baffle 7 is provided with a sliding part 71 and several receiving grooves 73.

[0026] Mounting base 5 is fixed to rotating bracket 31. First air deflector 6 is slidably disposed in sliding groove 51. Limiting pin 10 passes through two pin holes 52 and oblong hole 61. When first air deflector 6 slides outward a certain distance, it is limited by limiting pin 10, thereby restricting its sliding range and preventing it from dislodging from sliding groove 51. Spring plate 9 is disposed in sliding groove 51 and abuts against the inner end of first air deflector 6. Second air deflector 7 is slidably disposed in mounting groove 11. Several compression springs 8 correspond to several receiving grooves 73, one end of which is located in the corresponding receiving groove 73 and abuts against the inner wall of receiving groove 73, and the other end abuts against the inner wall of mounting groove 11.

[0027] When the circuit is opened, the first air baffle 6 and the second air baffle 7 extend under the elastic force of the spring plate 9 and the compression spring 8, respectively. The extended first air baffle 6 and the second air baffle 7 block the downward arc that is ejected when the moving contact 33 separates from the stationary contact 32.

[0028] The waist-shaped hole 61 is set along the sliding direction of the first air baffle 6, thereby limiting its range of movement.

[0029] The outer end of the first air baffle 6 is provided with an arc-shaped contact surface 62. The outer end of the second air baffle 7 is provided with a pressure-bearing surface 72, which is planar and perpendicular to the sliding direction of the second air baffle 7. When closing the circuit, the contact surface 62 of the first air baffle 6 presses against the pressure-bearing surface 72 of the second air baffle 7. Through bidirectional force, the first air baffle 6 and the second air baffle 7 retract, accumulating elastic potential energy for the subsequent opening process, which helps to improve the opening rate of the opening process.

[0030] The mounting groove 11 has a T-shaped cross section. The sliding part 71 and the second air deflector 7 together form the T-shape. The sliding part 71 is used to prevent the second air deflector 7 from disengaging from the mounting groove 11.

[0031] The second air baffle 7 is arranged opposite to the first air baffle 6, and their sliding directions are parallel, so that the second air baffle 7 and the first air baffle 6 can come into contact when the circuit is closed.

[0032] Working process: During circuit breaking, the rotating bracket 31 rotates forward, causing the moving contact 33 to separate from the stationary contact 32. The rotating bracket 31 also causes the mounting base 5, the limit pin 10, and the first air baffle 6 to move away from the second air baffle 7. This causes the first air baffle 6 and the second air baffle 7 to extend under the elastic force of the spring plate 9 and the compression spring 8, respectively. The extended first air baffle 6 and the second air baffle 7 block the downward arc ejected when the moving contact 33 separates from the stationary contact 32. Furthermore, the elastic force of the spring plate 9 and the compression spring 8 increases the pressure between the rotating bracket 31 and the outer casing 1, allowing the moving contact 33 and the stationary contact 32 to separate more quickly during circuit breaking, thereby breaking the arc and facilitating its extinguishing. This reduces the burn damage to the moving contact 33 and the stationary contact 32.

[0033] When the circuit is closed, the rotating bracket 31 rotates in the opposite direction, causing the moving contact 33 to contact the stationary contact 32. The rotating bracket 31 causes the mounting base 5, the limit pin 10, and the first air baffle 6 to approach the second air baffle 7. The contact surface 62 of the first air baffle 6 presses against the pressure surface 72 of the second air baffle 7. Through bidirectional force, the first air baffle 6 and the second air baffle 7 retract, compressing the spring plate 9 and the compression spring 8.

[0034] The above embodiments are only some embodiments of this utility model, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the protection scope of this utility model.

Claims

1. A DC disconnector contact system arc-blocking booster device, comprising a mounting base (5), characterized in that, It also includes a first air baffle (6), a second air baffle (7), several compression springs (8), spring plates (9), and a limiting pin (10); the housing (1) of the DC disconnect switch has an installation groove (11) on the inner wall near the stationary contact (32); the mounting base (5) has a sliding groove (51) on the side near the stationary contact (32), and the mounting base (5) has pin holes (52) on both sides of the sliding groove (51); the first air baffle (6) has a waist-shaped hole (61); the inner end of the second air baffle (7) has a sliding part (71) and several receiving grooves (73); the mounting base (5) is fixed on the rotating bracket (31), the first air baffle (6) is slidably set in the sliding groove (51), and the limiting pin (10) passes through the two pin holes (52) and the waist-shaped hole (61) in the first air baffle. When the gas shield (6) slides outward a certain distance, it will be limited by the limit pin (10), thereby limiting its sliding range. The spring plate (9) is set in the sliding groove (51) and abuts against the inner end of the first gas shield (6). The second gas shield (7) is slidably set in the mounting groove (11). Several compression springs (8) correspond to several receiving grooves (73). One end of the spring is located in the corresponding receiving groove (73) and abuts against the inner wall of the receiving groove (73), and the other end abuts against the inner wall of the mounting groove (11). When the circuit is opened, the first gas shield (6) and the second gas shield (7) are extended under the elastic force of the spring plate (9) and the compression spring (8), respectively. The extended first gas shield (6) and the second gas shield (7) block the downward arc when the moving contact (33) separates from the stationary contact (32).

2. The arc-blocking booster device for the DC disconnector switch contact system according to claim 1, characterized in that: The waist-shaped hole (61) is set along the sliding direction of the first air baffle (6).

3. The arc-blocking booster device for the DC disconnector switch contact system according to claim 1, characterized in that: The outer end of the first air baffle (6) is provided with an arc-shaped contact surface (62), and the outer end of the second air baffle (7) is provided with a pressure surface (72). The pressure surface (72) is a plane and is perpendicular to the sliding direction of the second air baffle (7). When the circuit is closed, the contact surface (62) of the first air baffle (6) presses the pressure surface (72) of the second air baffle (7), and the first air baffle (6) and the second air baffle (7) retract through the bidirectional force.

4. The arc-blocking booster device for the DC disconnector switch contact system according to claim 1, characterized in that: The cross-section of the mounting groove (11) is T-shaped.

5. The arc-blocking booster device for the DC disconnector contact system according to claim 1, characterized in that: The sliding part (71) and the second air deflector (7) together form a T-shape.

6. The arc-blocking booster device for the DC disconnector switch contact system according to claim 1, characterized in that: The second air deflector (7) is positioned opposite to the first air deflector (6), and their sliding directions are parallel.

Images