Double-crank transmission mechanism and vacuum circuit breaker for electric locomotive

Abstract

The present invention discloses a double-crank transmission mechanism and a vacuum circuit breaker for electric locomotives. The mechanism comprises a first connecting rod linearly connected to an arc extinguishing chamber and a second connecting rod connected to a drive mechanism. The first and second connecting rods are arranged in two parallel planes and are connected by an insulating support rod disposed within a support insulator. This invention significantly reduces the height of the low-voltage control section of the vacuum circuit breaker, significantly reducing the overall height of the vacuum circuit breaker, thereby providing a greater design margin for the overall height and the electrical clearance within the support insulator.

Description

Technical Field

[0001] The present invention relates to the field of electric locomotive vacuum circuit breakers, and in particular to a double-crank type transmission mechanism and a vacuum circuit breaker for an electric locomotive. Background Art

[0002] Vacuum circuit breakers are important electrical components on railway electric locomotives and EMUs. Currently, most vacuum circuit breakers used on domestic electric locomotives and EMUs are still driven by compressed air. Pneumatic vacuum circuit breakers must be equipped with complex air circuit mechanisms, pneumatic units and pneumatic components. Their driving reliability is affected by the quality of the overall air source provided by the locomotive and EMU. Especially with the increasing popularity of long-span locomotives and EMUs in my country, the quality problems caused by the poor environmental adaptability of pneumatic vacuum circuit breakers have become increasingly prominent. The complexity of the air circuit mechanism and the unstable quality of pneumatic components have also greatly affected the reliability of product application. Pneumatic component failure is one of the most common failures of traditional vacuum circuit breakers. The application of electromagnetic drive vacuum circuit breakers is an inevitable trend in the development of current vacuum circuit breaker drive technology.

[0003] Traditional vacuum circuit breakers typically utilize a vertically mounted top arc chute or a vertically mounted bottom control unit with a single-throw transmission mechanism, or both. Currently, the roof clearance for most vehicles in China is around 650mm or even stricter. Traditional vacuum circuit breakers, in addition to the impact of the vertically mounted arc chute, also need to consider the impact of the internal vertically mounted drive mechanism, resulting in electrical clearances failing to meet increasingly stringent standards.

[0004] The electromagnetic drive mechanism of the electromagnetic vacuum circuit breaker is relatively large in length, requires a large installation space, and has a small design margin. Summary of the Invention

[0005] The present invention provides a double-crank transmission mechanism and a vacuum circuit breaker for an electric locomotive, which are used to solve the technical problems of the electromagnetic drive mechanism of the electromagnetic vacuum circuit breaker being relatively large in length, requiring a large installation space and having a small design margin.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0007] A double-crank transmission mechanism includes: a first connecting rod linearly connected to an arc extinguishing chamber and a second connecting rod connected to a driving device, the first connecting rod and the second connecting rod are arranged in two parallel horizontal planes, and the first connecting rod and the second connecting rod are connected by an insulating support rod arranged in a supporting insulator.

[0008] Preferably, the first connecting rod is connected to the first end of the insulating support rod through a first transmission device, and the second connecting rod is connected to the second end of the insulating support rod through a second transmission device.

[0009] Preferably, the first connecting rod and the insulating stay rod are arranged at a right angle, and the second connecting rod and the insulating stay rod are arranged at a right angle.

[0010] Preferably, the first connecting rod, the insulating stay rod, and the second connecting rod are all arranged in a vertical plane and the three are in an "L" shape.

[0011] Preferably, the first transmission device is an upper transmission triangular bracket. The first corner of the upper transmission triangular bracket is rotatably connected to the first connecting rod, the second corner of the upper transmission triangular bracket is rotatably connected to the first end of the insulating stay rod, and the third corner of the upper transmission triangular bracket is fixed to the transmission head. <00>

[0012] Preferably, the second transmission device is a lower transmission triangular bracket. The first corner of the lower transmission triangular bracket is rotatably connected to the second end of the insulating stay rod, the second corner of the lower transmission triangular bracket is rotatably connected to the first section of the second connecting rod, and the third corner of the lower transmission triangular bracket is fixed to the transmission bracket.

[0013] Preferably, the ratio of the length of the connecting side between the first and third corners of the upper transmission triangular bracket to the length of the connecting side between the second and third corners of the upper transmission triangular bracket is 1:1 to 1:2; the ratio of the length of the connecting side between the first and third corners of the lower transmission triangular bracket to the length of the connecting side between the second and third corners of the lower transmission triangular bracket is 2:1 to 1:1.

[0014] Preferably, the first section of the second connecting rod is rotatably connected to the second corner of the second transmission device; the second section of the second connecting rod is rotatably connected to the multi-functional transmission shaft through a double-headed screw. The multi-functional transmission shaft is directly connected to the driving device in a straight line. The multi-functional transmission shaft is provided with a first opening spring and a second opening spring. The first opening spring and the second opening spring are respectively arranged on both sides of the third corner of the lower transmission triangular bracket and are used to be compressed during closing and provide an automatic opening force during opening.

[0015] Preferably, transmission mounting blocks are respectively provided at the first end and the second end of the insulating stay rod for rotatable connection with the first transmission device and the second transmission device.

[0016] The present invention also provides a vacuum circuit breaker for an electric locomotive, including an arc extinguishing chamber, a support insulator, and a driving device. The driving device is connected to the arc extinguishing chamber through the above-mentioned double-crank transmission mechanism.

[0017] Preferably, the support insulator is fixed on the bottom plate. The driving device and the second connecting rod are arranged below the bottom plate. The insulating stay rod is connected to the second connecting rod through a through hole opened on the bottom plate; the first connecting rod is arranged in the housing of the transmission head, and the housing of the transmission head is respectively hermetically connected to the arc extinguishing chamber and the support insulator.

[0018] Preferably, the driving device is an electromagnetic driving device.

[0019] The present invention has the following beneficial effects:

[0020] 1. The double-crank transmission mechanism of the present invention converts horizontal driving force from the bottom into horizontal thrust from the top within a limited structural space, achieving efficient force transmission direction conversion. The horizontal placement of the drive device at the bottom and the arc extinguishing chamber at the top significantly reduces the height of the vacuum circuit breaker's low-voltage control section and the overall height of the vacuum circuit breaker, allowing for greater design margins in both the overall height and the electrical clearance within the support insulator.

[0021] 2. In the preferred embodiment, the present invention's double-crank transmission mechanism, utilizing the upper and lower triangular brackets for force transmission, converts the bottom horizontal driving force into the top horizontal thrust within a limited structural space, achieving efficient force direction conversion. Furthermore, by adjusting the transmission edge dimensions of the triangular transmission brackets, the drive stroke can be scaled within a certain range, resulting in a stable structure, excellent reliability, and high transmission efficiency.

[0022] 3. The vacuum circuit breaker for electric locomotives of the present invention features a low-voltage control section and a low overall height, requiring less installation space and reducing installation costs, thus facilitating equipment miniaturization. Furthermore, the overall height and internal electrical clearance of the support insulators provide a greater design margin.

[0023] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a partial cross-sectional structural diagram of a double-crank type transmission mechanism and a vacuum circuit breaker for an electric locomotive according to a preferred embodiment of the present invention;

[0026] Figure 2 is a structural schematic diagram of a first transmission device according to a preferred embodiment of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the second transmission device of the preferred embodiment of the present invention.

[0028] The numbers in the figure represent:

[0029] 1. Arc extinguishing chamber; 2. Transmission head; 3. First connecting rod; 4. First transmission device; 41. First corner of upper transmission triangle bracket; 42. Second corner of upper transmission triangle bracket; 43. Third corner of upper transmission triangle bracket; 5. Support insulator; 6. Insulating push rod; 7. Base plate; 8. Second transmission device; 81. First corner of lower transmission triangle bracket; 82. Second corner of lower transmission triangle bracket; 83. Third corner of lower transmission triangle bracket; 9. Second connecting rod; 10. Drive device; 11. Transmission bracket; 12. First opening spring; 13. Double-headed screw; 14. Multi-function transmission shaft; 15. Second opening spring; 16. Transmission mounting block. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0031] See also Figure 1 The double-crank transmission mechanism of the present invention includes: a first connecting rod 3 connected to the arc extinguishing chamber 1 in a straight line and a second connecting rod 9 connected to the driving device 10. The first connecting rod 3 and the second connecting rod 9 are arranged in two parallel horizontal planes, and the first connecting rod 3 and the second connecting rod 9 are connected by an insulating strut provided in the supporting insulator 5. In a limited structural space, the bottom horizontal driving force is converted into the top horizontal thrust, thereby achieving efficient force transmission direction conversion. The horizontal placement of the driving device 10 at the bottom and the arc extinguishing chamber 1 at the top can greatly reduce the height of the low-voltage control part of the vacuum circuit breaker and significantly reduce the overall height of the vacuum circuit breaker, so that the overall height of the product and the internal electrical clearance of the supporting insulator 5 have a larger design margin.

[0032] In actual implementation, the above double-crutch transmission mechanism can also be expanded or applied as follows. The technical features in the following embodiments can be combined with each other. The embodiments are only examples and are not intended to limit the normal combination of technical features.

[0033] Example 1:

[0034] The double-crank transmission mechanism of this embodiment includes a first connecting rod 3 linearly connected to the arc extinguishing chamber 1 and a second connecting rod 9 connected to the drive device 10. The first connecting rod 3 and the second connecting rod 9 are arranged in two parallel horizontal planes. The first connecting rod 3 is connected at a right angle to the first end of the insulating support rod via a first transmission device 4, and the second connecting rod 9 is connected at a right angle to the second end of the insulating support rod via a second transmission device 8. When the vacuum circuit breaker is actuated, the horizontal thrust of the bottom drive device 10 is converted into vertical thrust via the bottom lower triangular bracket, and then the vertical thrust is converted into top horizontal thrust via the top upper triangular bracket.

[0035] In this embodiment, the first connecting rod 3, the insulating support rod, and the second connecting rod 9 are all arranged in a vertical plane and the three are in an inverted "U" shape (rotated 90 degrees counterclockwise). The driving device 10 at the bottom and the arc extinguishing chamber 1 at the top are horizontally placed, achieving an inverted "U" shape layout (rotated 90 degrees counterclockwise) of the vacuum circuit breaker, significantly reducing the total height of the vacuum circuit breaker.

[0036] In this embodiment, referring to Figure 2 , the first transmission device 4 is an upper transmission triangular bracket. The first corner 41 of the upper transmission triangular bracket is rotatably connected to the first connecting rod 3. The second corner 42 of the upper transmission triangular bracket is rotatably connected to the first end of the insulating support rod. The third corner 43 of the upper transmission triangular bracket is fixed to the transmission head 2. The triangular bracket is composed of two plates, and the center is a fastening screw.

[0037] Referring to Figure 3 , the second transmission device 8 is a lower transmission triangular bracket. The first corner 81 of the lower transmission triangular bracket is rotatably connected to the second end of the insulating support rod. The second corner 82 of the lower transmission triangular bracket is rotatably connected to the middle of the second connecting rod 9. The third corner 83 of the lower transmission triangular bracket is fixed to the transmission bracket 11.

[0038] The ratio of the connecting side between the first corner 41 and the third corner 43 of the upper transmission triangular bracket to the connecting side between the second corner 42 and the third corner 43 of the upper transmission triangular bracket is 1:1 to 1:2; the ratio of the connecting side between the first corner 81 and the third corner 83 of the lower transmission triangular bracket to the connecting side between the second corner 82 and the third corner 83 of the lower transmission triangular bracket is 2:1 to 1:1; the double-crank transmission mechanism realizes the proportional scaling of the driving stroke within a certain range by setting the transmission side dimensions of the upper transmission triangular bracket and the lower transmission triangular bracket, and has a stable structure, good reliability, and high transmission efficiency.

[0039] The first section of the second connecting rod 9 is rotatably connected to the second corner of the second transmission device 8; the second section of the second connecting rod 9 is rotatably connected to the multi-functional transmission shaft 14 through a double-headed screw 13. The double-headed screw 13 is slidably connected to the transmission bracket 11 in the horizontal direction to play an auxiliary orientation role. The multi-functional transmission shaft 14 is linearly connected to the driving device 10. The multi-functional transmission shaft 14 is provided with a first opening spring 12 and a second opening spring 15. The first opening spring 12 is arranged between the transmission bracket 11 and the multi-functional transmission shaft 14. The second opening spring 15 is arranged on both sides of the multi-functional transmission shaft and is used to be compressed during closing and provide an automatic opening force during opening.

[0040] The first end and the second end of the insulating support rod are equipped with transmission mounting blocks 16 for rotatable connection with the first transmission device 4 and the second transmission device 8.

[0041] This embodiment also provides a vacuum circuit breaker for electric locomotives, see Figure 1 The device comprises an arc extinguishing chamber 1, a support insulator 5, and a drive device 10. The drive device 10 is connected to the arc extinguishing chamber 1 via the aforementioned double-crank transmission mechanism. The support insulator 5 is fixed to the base plate 7. The drive device 10 and the second connecting rod 9 are mounted below the base plate 7. The insulating support rod is connected to the second connecting rod 9 via a through-hole in the base plate 7. The first connecting rod 3 is disposed within the housing of the transmission head 2, which is sealedly connected to the arc extinguishing chamber 1 and the support insulator 5, respectively. The drive device 10 is an electromagnetic drive device 10.

[0042] During the closing operation of this embodiment, the electromagnetic drive device 10 at the bottom is energized, the driving iron core pushes the multifunctional transmission shaft 14, the second transmission rod moves horizontally, and at the same time the first opening spring 12 and the second opening spring 15 are compressed, the second transmission rod pushes the lower transmission triangle bracket to rotate, and the thrust is converted into a vertical pulling force, pulling the insulating push rod 6 downward, and then pulling the upper transmission triangle bracket to rotate, converting the vertical pulling force into a top horizontal thrust, pushing the first connecting rod 3 to move, and realizing the closing action of the arc extinguishing chamber 1.

[0043] When the circuit breaker of this embodiment is in opening operation, the electromagnetic drive device 10 at the bottom loses power, the first opening spring 12 and the second opening spring 15 release their elastic force, pushing the multi-functional transmission shaft 14, and the second transmission rod moves horizontally. The second transmission rod pulls the lower transmission triangle bracket to rotate, and the pulling force is converted into a vertical thrust, pulling the insulating push rod 6 to move upward, and then pushing the upper transmission triangle bracket to rotate, converting the vertical thrust into a top horizontal pulling force, pushing the first connecting rod 3 to move, and realizing the opening action of the arc extinguishing chamber 1.

[0044] By installing the electromagnetic vacuum circuit breaker of the present invention, the failures of the pneumatic components of traditional vacuum circuit breakers, such as leakage, sticking, and aging of rubber parts, are basically completely eliminated. Its driving reliability is not affected by the quality of the overall air supply provided by the locomotive and the EMU, and the failure rate is expected to be reduced by more than 60%. Since there is no complicated air circuit mechanism, pneumatic unit, pneumatic components and related air circuit seals, the maintenance cycle and cost of the circuit breaker can be greatly reduced.

[0045] In summary, the present invention achieves efficient force transmission direction conversion by converting the bottom horizontal driving force into the top horizontal thrust within a limited structural space. The horizontal placement of the bottom drive device 10 and the top arc extinguishing chamber 1 can greatly reduce the height of the low-voltage control portion of the vacuum circuit breaker and significantly reduce the overall height of the vacuum circuit breaker, thereby providing a greater design margin for the overall height of the product and the internal electrical clearance of the supporting insulator 5. The use of this transmission mechanism in vacuum circuit breakers for electric locomotives reduces the height of the low-voltage control portion of the circuit breaker, reduces the overall height, reduces the requirements for installation space, reduces installation costs, and facilitates miniaturization of the equipment.

[0046] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A double-crutch transmission mechanism, characterized in that: Including: A first connecting rod (3) linearly connected to the arc extinguishing chamber (1) and a second connecting rod (9) connected to the driving device (10). The first connecting rod (3) and the second connecting rod (9) are arranged in two parallel horizontal planes. The first connecting rod (3) and the second connecting rod (9) are connected by an insulating push rod (6) arranged in the support insulator (5). The first connecting rod (3) is connected to the first end of the insulating push rod (6) through a first transmission device (4), and the second connecting rod (9) is connected to the second end of the insulating push rod (6) through a second transmission device (8). The arc extinguishing chamber (1) and the first transmission device (4) are disposed on both sides of the insulating push rod (6), and the driving device (10) and the second transmission device (8) are disposed on both sides of the insulating push rod (6).

2. The double-crutch transmission mechanism according to claim 1, characterized in that: The first connecting rod (3) is arranged at a right angle to the insulating push rod (6), and the second connecting rod (9) is arranged at a right angle to the insulating push rod (6).

3. The double-crutch transmission mechanism according to claim 1, characterized in that: The first connecting rod (3), the insulating push rod (6), and the second connecting rod (9) are all arranged in a vertical plane and are in an "n" shape.

4. The double-crutch transmission mechanism according to claim 1, characterized in that: The first transmission device (4) is an upper transmission triangular bracket. The first angle (41) of the upper transmission triangular bracket is rotatably connected to the first connecting rod (3), the second angle (42) of the upper transmission triangular bracket is rotatably connected to the first end of the insulating push rod (6), and the third angle (43) of the upper transmission triangular bracket is fixed to the transmission head (2).

5. The double-crutch transmission mechanism according to claim 4, characterized in that: The second transmission device (8) is a lower transmission triangular bracket. The first angle (81) of the lower transmission triangular bracket is rotatably connected to the second end of the insulating push rod (6), the second angle (82) of the lower transmission triangular bracket is rotatably connected to the first section of the second connecting rod (9), and the third angle (83) of the lower transmission triangular bracket is fixed to the transmission bracket (11).

6. The double-crutch transmission mechanism according to claim 5, characterized in that: The ratio of the length of the connecting side between the first angle (41) and the third angle (43) of the upper transmission triangular bracket to the length of the connecting side between the second angle (42) and the third angle (43) of the upper transmission triangular bracket is 1:1 to 1:2; the ratio of the length of the connecting side between the first angle (81) and the third angle (83) of the lower transmission triangular bracket to the length of the connecting side between the second angle (82) and the third angle (83) of the lower transmission triangular bracket is 2:1 to 1:

1.

7. The double-crutch transmission mechanism according to claim 6, characterized in that: The first section of the second connecting rod (nine) is rotatably connected to the second angle of the second transmission device (8); the second section of the second connecting rod (9) is rotatably connected to the multi-functional transmission shaft (14) through a double-headed screw (13). The multi-functional transmission shaft (14) is linearly connected to the driving device (10). The multi-functional transmission shaft (14) is provided with a first opening spring (12) and a second opening spring (15). The first opening spring (12) and the second opening spring (15) are respectively arranged on both sides of the third angle (83) of the lower transmission triangular bracket and are used to be compressed during closing and provide an automatic opening force during opening.

8. The double-crutch transmission mechanism according to claim 6, characterized in that: The first end and the second end of the insulating push rod (6) are respectively provided with a transmission mounting block (16) for rotatably connecting with the first transmission device (4) and the second transmission device (8).

9. A vacuum circuit breaker for electric locomotive, characterized in that: The invention comprises an arc extinguishing chamber (1), a supporting insulator (5) and a driving device (10), wherein the driving device (10) is connected to the arc extinguishing chamber (1) via a double-bend transmission mechanism as described in any one of claims 1 to 8.

10. The vacuum circuit breaker for electric locomotive according to claim 9, characterized in that: The supporting insulator (5) is fixed on the base plate (7), the driving device (10) and the second connecting rod (9) are installed below the base plate (7), and the insulating push rod (6) is connected to the second transmission device (8) through a through hole opened on the base plate (7); the first connecting rod (3) is arranged in the housing of the transmission head (2), and the housing of the transmission head (2) is closed and connected to the arc extinguishing chamber (1) and the supporting insulator (5) respectively.

11. The vacuum circuit breaker for electric locomotive according to claim 10, characterized in that: The driving device (10) is an electromagnetic driving device.

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