Protective main knife switch structure of double-column horizontal telescopic disconnecting switch

Abstract

A protective main knife switch structure of a double-column horizontal telescopic disconnecting switch is characterized in that a moving contact is connected with one end of a front rod, and the other end of the front rod is connected with one end of a rear support rod and one end of a rear transmission rod through a joint mechanism; the other end of the rear supporting rod and the other end of the rear transmission rod are connected with the internal structure of the transmission box; and the other end of the transmission shaft is connected with the internal structure of the transmission box. A crank arm mechanism connected with the transmission shaft is arranged in the transmission box, the action output end of the crank arm mechanism is connected with one end of a connecting rod, and the connecting rod is driven to move back and forth through the transmission shaft; the other end of the connecting rod is connected with the driving rotating shaft through a transmission mechanism; two ends of the driving rotating shaft extend out of the transmission case and are connected with rear transmission rods; two ends of the driven shaft extend out of the transmission case and are connected with the rear support rod. According to the utility model, the assembly structure is simplified, key parts are prevented from being influenced by the environment, long-term stable operation of equipment is ensured, the maintenance period is prolonged, and the safety and stability of power grid lines are improved.

Description

Technical Field

[0001] This utility model relates to the field of ultra-high voltage power equipment, and in particular to a protective main switch structure for a double-column horizontal telescopic disconnector. Background Technology

[0002] High-voltage AC disconnect switches are important equipment in power systems to ensure the safe, reliable, and stable operation of the power grid. With the continuous development of the power industry and the advancement of power equipment technology, power systems have put forward requirements for high-voltage AC disconnect switches, such as simplified structure, simple operation, reliable operation, long service life, and easy installation and maintenance.

[0003] Existing double-column horizontal telescopic disconnectors have the following shortcomings: First, the main switch balance spring device is generally placed in the rear conductive tube of the disconnector. This design requires an opening in the rear conductive tube to accommodate the spring guide device, resulting in poor protection for the balance spring. After years of operation, the balance spring may rust, make abnormal noises, or even fail. Furthermore, the balance spring installed in the rear conductive tube is inconvenient to maintain, difficult to observe, and requires complete disassembly of the disconnector for replacement. Second, the transmission linkage device is exposed and unprotected, making the transmission components prone to rust and corrosion, and easily causing jamming at the shaft. Additionally, because the original structure's outer conductive tube is made of aluminum while the internal tie rod is generally made of cast iron, in regions with significant temperature differences between winter and summer, the different coefficients of thermal expansion of these materials may cause incomplete opening and closing, or equipment jamming, due to the varying degrees of expansion. Finally, both the front and rear conductive tubes generally use a single-tube structure, which results in poor closing stability and a tendency to sway during operation. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this utility model provides a protective main switch structure for a double-column horizontal telescopic disconnector.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a protective main switch structure for a double-column horizontal telescopic disconnector, comprising a rear support rod, a rear transmission rod, a transmission part, a balance spring assembly, a transmission box, a transmission shaft, a moving contact, and a front rod; the moving contact is connected to one end of the front rod, and the other end of the front rod is connected to one end of the rear support rod and the rear transmission rod via a joint mechanism; the other end of the rear support rod and the other end of the rear transmission rod are connected to the internal structure of the transmission box; one end of the transmission shaft protrudes from the transmission box, and the other end is connected to the internal structure of the transmission box;

[0006] The transmission box is equipped with a crank arm mechanism connected to the transmission shaft. The output end of the crank arm mechanism is connected to one end of the connecting rod I, which drives the connecting rod I to move back and forth through the transmission shaft. The other end of the connecting rod I is connected to the drive shaft through the transmission mechanism, which drives the drive shaft to rotate. The two ends of the drive shaft extend out of the transmission box and are connected to the rear transmission rod. The two ends of the driven shaft extend out of the transmission box and are connected to the rear support rod.

[0007] The joint mechanism consists of link II and a tripod; the tripod is an isosceles triangle with an obtuse apex angle; there are three links II; one link II is connected at one end to the end of the front rod and at the other end to one base angle of the tripod; the other two links II are connected at one end and at the other end to the ends of the front rod and the rear drive rod, respectively; the other base angle of the tripod is connected to the rear support rod, and the apex angle of the tripod is connected to the rear drive rod; the length of the isosceles side of link II is equal to that of the tripod.

[0008] The transmission box is equipped with a balance spring rod. One end of the balance spring rod is connected to the inner wall of the transmission box, and the other end of the balance spring rod is connected to the drive shaft through a transmission mechanism. A balance spring is provided on the balance spring rod.

[0009] The transmission mechanism has three parts: the middle one is connected to connecting rod I, and the two on the sides are connected to the balance spring rods.

[0010] The transmission mechanism includes a double lug I connected to the drive shaft, with a pin I passing through the other end of the double lug I. The pin I has two clamping plates, which are connected to a connecting rod I or a balance spring rod.

[0011] The crank arm mechanism includes a rotating plate, one end of which is connected to a drive shaft and driven to rotate by the drive shaft. The other end of the rotating plate is connected to a connecting plate via pin II. One end of the double lug II is connected to a connecting rod sleeve, and the other end is connected to the connecting plate. The connecting rod sleeve is fitted onto the end of the connecting rod I.

[0012] The beneficial effects of this utility model are as follows: Firstly, the structure of this utility model integrates the balance spring device and the internal transmission linkage device, which are located inside the rear conductive tube, into the protective housing, simplifying product assembly and facilitating later maintenance. Secondly, the protective housing effectively protects the balance spring device and transmission linkage device from external corrosion and other problems, thus extending the maintenance cycle, ensuring the stability of the opening and closing of the equipment during long-term operation, and avoiding problems such as abnormal spring noise after many years of product operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main switch structure of the disconnector.

[0014] Figure 2This is a front-view 3D view after the main switch is closed.

[0015] Figure 3 This is a top-down 3D view of the main switch after it has been closed.

[0016] Figure 4 This is a front-view 3D view after the main switch has been opened;

[0017] Figure 5 This is a top-down 3D view of the main switch after it has been opened.

[0018] Figure 6 This is a top view of the transmission box after the main switch is closed.

[0019] Figure 7 This is a schematic diagram illustrating the motion principle of the transmission shaft and crank arm mechanism inside the transmission box during the closing process of the main switch. Detailed Implementation

[0020] The protective main switch structure of the double-column horizontal telescopic disconnector includes a rear support rod 1, a rear transmission rod 2, a transmission part 3, a balance spring 4, a transmission box 5, a transmission shaft 6, a moving contact 7, and a front rod 8. The moving contact 7 is connected to one end of the front rod 8, and the other end of the front rod 8 is connected to one end of the rear support rod 1 and the rear transmission rod 2 through a joint mechanism 9. The other end of the rear support rod 1 and the other end of the rear transmission rod 2 are connected to the internal structure of the transmission box 5. One end of the transmission shaft 6 protrudes from the transmission box 5, and the other end is connected to the internal structure of the transmission box 5.

[0021] The transmission box 5 is provided with a crank arm mechanism 11 connected to the transmission shaft 6. The output end of the crank arm mechanism 11 is connected to one end of the connecting rod I5-1, which drives the connecting rod I5-1 to move back and forth through the transmission shaft 6. The other end of the connecting rod I5-1 is connected to the active rotating shaft 5-3 through the transmission mechanism 10, which drives the active rotating shaft 5-3 to rotate. The two ends of the active rotating shaft 5-3 extend out of the transmission box 5 and are connected to the rear transmission rod 2. The driven shaft 5-4 extends out of the transmission box 5 and is connected to the rear support rod 1.

[0022] The joint mechanism 9 consists of connecting rod II 9-1 and a tripod 9-2; the tripod 9-2 is an isosceles triangle with an obtuse apex angle; there are three connecting rods II 9-1; one end of one connecting rod II 9-1 is connected to the end of the front rod 8, and the other end is connected to one base angle of the tripod 9-2; the other two connecting rods II 9-1 are connected at one end, and the other ends are respectively connected to the ends of the front rod 8 and the rear transmission rod 2; the other base angle of the tripod 9-2 is connected to the rear support rod 1, and the apex angle of the tripod 9-2 is connected to the rear transmission rod 2; the isosceles sides of the connecting rod II 9-1 and the tripod 9-2 are of equal length.

[0023] The transmission box 5 is equipped with a balance spring rod 5-2. One end of the balance spring rod 5-2 is connected to the inner wall of the transmission box 5, and the other end is connected to the drive shaft 5-3 through the transmission mechanism 10. A balance spring 4 is provided on the balance spring rod 5-2. The transmission mechanism 10 has three parts, the middle one is connected to the connecting rod 15-1, and the two parts on both sides are connected to the balance spring rod 5-2.

[0024] The transmission mechanism 10 includes a double lug I10-2 connected to the drive shaft 5-3. The other end of the double lug I10-2 is through a pin I10-3. The pin I10-3 has two clamping plates 10-1. The clamping plates 10-1 are connected to the connecting rod I5-1 or the balance spring rod 5-2.

[0025] The crank arm mechanism 11 includes a rotating plate 11-1, one end of which is connected to the drive shaft 6 and rotated by the drive shaft 6. The other end of the rotating plate 11-1 is connected to the connecting plate 11-3 via pin II11-2. One end of the double lug II11-4 is connected to the connecting rod sleeve 11-5, and the other end is connected to the connecting plate 11-3. The connecting rod sleeve 11-5 is fitted onto the end of the connecting rod I5-1.

[0026] The specific implementation method is as follows:

[0027] When closing the circuit breaker, the porcelain insulator is rotated manually or electrically, causing the drive shaft 6 below the main switch transmission box to rotate clockwise. The crank arm mechanism moves as follows: Figure 7 As shown. This pushes the connecting rod I5-1 forward, which in turn rotates the drive shaft 5-3 via the transmission mechanism 10, thus achieving the closing action. The center of gravity of the main switch lever drops, and the reduced gravitational potential energy is converted into the elastic potential energy of the balance spring 4. The balance spring 4 stretches and stores energy, and the main switch lever completes the closing action. Figure 2 , Figure 3 This is a schematic diagram showing the position after the main switch closing action is completed.

[0028] When the circuit breaker is opened, the operating porcelain insulator is rotated in the opposite direction, which drives the transmission shaft 6 below the main circuit breaker transmission box to rotate counterclockwise. This pushes the connecting rod I5-1 to move backward, and through the transmission mechanism 10, the active rotating shaft 5-3 rotates in the opposite direction, causing the main circuit breaker to move in the opening direction. At this time, the tension of the balance spring is reduced, and its stored elastic potential energy is released, which is transformed into the gravitational potential energy after the center of gravity of the main circuit breaker is raised. The main circuit breaker completes the opening action, and the elastic potential energy stored in the balance spring is completely released. Figure 4 , Figure 5 A schematic diagram showing the position after the main switch tripping action is completed.

Claims

1. A protective main switch structure for a double-column horizontal telescopic disconnector, characterized in that: It includes a rear support rod (1), a rear transmission rod (2), a transmission part (3), a balance spring (4), a transmission box (5), a transmission shaft (6), a moving contact (7), and a front rod (8); the moving contact (7) is connected to one end of the front rod (8), and the other end of the front rod (8) is connected to one end of the rear support rod (1) and the rear transmission rod (2) through a joint mechanism (9); the other end of the rear support rod (1) and the other end of the rear transmission rod (2) are connected to the internal structure of the transmission box (5); one end of the transmission shaft (6) protrudes from the transmission box (5), and the other end is connected to the internal structure of the transmission box (5); The transmission box (5) is provided with a crank arm mechanism (11) connected to the transmission shaft (6). The output end of the crank arm mechanism (11) is connected to one end of the connecting rod I (5-1), and the connecting rod I (5-1) moves back and forth through the transmission shaft (6). The other end of the connecting rod I (5-1) is connected to the active rotating shaft (5-3) through the transmission mechanism (10), and the active rotating shaft (5-3) rotates through the connecting rod I (5-1). The two ends of the active rotating shaft (5-3) extend out of the transmission box (5) and are connected to the rear transmission rod (2). The driven shaft (5-4) extends out of the transmission box (5) and is connected to the rear support rod (1).

2. The protective main switch structure of the double-column horizontal telescopic disconnector according to claim 1, characterized in that: The joint mechanism (9) consists of connecting rod II (9-1) and a tripod (9-2); the tripod (9-2) is an isosceles triangle with an obtuse apex angle; there are three connecting rods II (9-1); one end of one connecting rod II (9-1) is connected to the end of the front rod (8), and the other end is connected to one base angle of the tripod (9-2); the other two connecting rods II (9-1) are connected at one end, and the other ends are connected to the ends of the front rod (8) and the rear transmission rod (2) respectively; the other base angle of the tripod (9-2) is connected to the rear support rod (1), and the apex angle of the tripod (9-2) is connected to the rear transmission rod (2); the isosceles sides of the connecting rod II (9-1) and the tripod (9-2) are of equal length.

3. The protective main switch structure of the double-column horizontal telescopic disconnector according to claim 1, characterized in that: The transmission box (5) is equipped with a balance spring rod (5-2). One end of the balance spring rod (5-2) is connected to the inner wall of the transmission box (5), and the other end of the balance spring rod (5-2) is connected to the drive shaft (5-3) through the transmission mechanism (10). A balance spring (4) is provided on the balance spring rod (5-2).

4. The protective main switch structure of the double-column horizontal telescopic disconnector according to claim 3, characterized in that: The transmission mechanism (10) has three parts, with the middle one connected to the connecting rod I (5-1) and the two sides connected to the balance spring rods (5-2).

5. The protective main switch structure of the double-column horizontal telescopic disconnector according to claim 4, characterized in that: The transmission mechanism (10) includes a double ear plate I (10-2) connected to the active rotating shaft (5-3). The other end of the double ear plate I (10-2) is through a pin I (10-3). There are two clamping plates (10-1) on the pin I (10-3). The clamping plates (10-1) are connected to the connecting rod I (5-1) or the balance spring rod (5-2).

6. The protective main switch structure of the double-column horizontal telescopic disconnector according to claim 1, characterized in that: The crank arm mechanism (11) includes a rotating plate (11-1), one end of which is connected to the transmission shaft (6) and rotates through the transmission shaft (6). The other end of the rotating plate (11-1) is connected to the connecting plate (11-3) through pin II (11-2). One end of the double ear plate II (11-4) is connected to the connecting rod sleeve (11-5) and the other end is connected to the connecting plate (11-3). The connecting rod sleeve (11-5) is fitted onto the end of the connecting rod I (5-1).

Images