Four-bar linkage transmission system for double-acting high-voltage knob insulator circuit breaker

Abstract

The utility model relates to a four-bar linkage transmission system for a double-acting high-voltage porcelain column circuit breaker, which comprises a main frame and a three-fork crank arm, the three-fork crank arm comprises a first lug, a second lug and a third lug, the first lug is hinged with a first interphase pull rod, the second lug is hinged with an output pull rod, and the third lug is hinged with a second interphase pull rod; the first interphase pull rod is in transmission connection with the transmission case input shaft of the three-phase body I and the transmission case input shaft of the three-phase body II, and the second interphase pull rod is in transmission connection with the transmission case input shaft of the three-phase body III. According to the utility model, through the arrangement of the trident crank arm, the first interphase pull rod and the second interphase pull rod have the same stress type and are simultaneously pulled or pressed in the movement process, and the first interphase pull rod and the second interphase pull rod are completely pulled in the opening process with a faster movement speed and completely pressed in the closing process with a slower movement speed, thereby better adapting to the stress characteristics of the pull rods; and the transmission efficiency and the service life of the transmission system are obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage circuit breakers, in particular to a switching transmission of a high-voltage porcelain column circuit breaker, and specifically refers to a four-link transmission system for a double-acting high-voltage porcelain column circuit breaker. Background Art

[0002] High voltage circuit breakers refer to circuit breakers of 3kV and above in power systems, which play a role in controlling and protecting power grids. Porcelain column circuit breakers are a commonly used type of high voltage circuit breaker, including arc extinguishing chamber, insulating support, transmission box, transmission system, mechanism and bracket. According to the structure, high voltage porcelain column circuit breakers are divided into two types: three-phase discrete and three-phase mechanical linkage.

[0003] At present, the commonly used three-phase mechanical linkage structure is to set the transmission rod in a straight line. Specifically, the arc extinguishing chamber, insulating support and transmission box are assembled together in advance to form a body, and then the three-phase body is placed on three brackets respectively. In the middle of the three brackets, two interphase pull rods (transmission pull rods) are connected together, or an integral interphase pull rod is directly used to connect the three transmission boxes. During the closing and opening process, the output force of the mechanism is applied to the interphase pull rod in a certain way, and the three-phase transmission box is driven to rotate through the interphase pull rod, so as to realize the closing and opening process of the arc extinguishing chamber.

[0004] However, the current three-phase linkage transmission structure is in the form of double tie rods or single tie rods, which has the following disadvantages: 1. The tie rod adopts a linear design. During the same movement of the arc extinguishing chamber, the two ends of the tie rod are subjected to different forces, one end is under tension and the other end is under pressure. The tie rod is prone to deformation under long-term fatigue. 2. The force-bearing process of the phase-to-phase tie rod does not consider the movement state of the arc extinguishing chamber, and the opening and closing processes are not distinguished. During the opening process at a high speed of the arc extinguishing chamber, one end of the phase-to-phase tie rod is still under pressure, which is prone to concentrated force, affecting the transmission efficiency and service life of the tie rod. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a four-link transmission system for a double-acting high-voltage porcelain column circuit breaker, which achieves consistent force types on the phase-to-phase pull rods during opening and closing, and improves the transmission efficiency and service life of the transmission system.

[0006] The utility model is realized by the following technical scheme, and provides a four-link transmission system for a double-acting high-voltage porcelain column circuit breaker, comprising a fixed main frame, and a three-pronged crank arm rotatably connected to the main frame through a rotating shaft, the three-pronged crank arm comprising a first ear seat, a second ear seat and a third ear seat sequentially arranged along the circumferential direction, a first interphase pull rod is hinged on the first ear seat through a first pin shaft, an output pull rod is hinged on the second ear seat through a second pin shaft, and a second interphase pull rod is hinged on the third ear seat through a third pin shaft; the first pin shaft, the second pin shaft and the third pin shaft are all parallel to the rotating shaft, and the first pin shaft and the third pin shaft are respectively located on both sides of the rotating shaft; the first interphase pull rod is drivingly connected to the transmission box input shaft of the three-phase body I and the transmission box input shaft of the three-phase body II, and the second interphase pull rod is drivingly connected to the transmission box input shaft of the three-phase body III.

[0007] When the present solution is in use, force is applied to the tripod arm through the output pull rod. When the tripod arm rotates, the first interphase pull rod and the second interphase pull rod respectively drive the input shaft of each transmission box to rotate to achieve opening or closing of the switch. Due to the structural setting of the tripod arm, the force type of the first interphase pull rod and the second interphase pull rod are the same regardless of opening or closing, and they are subjected to tension or compression at the same time, thereby extending the service life of the interphase pull rods.

[0008] As an optimization, the first interphase pull rod is hinged with a crank arm I and a crank arm II, the crank arm I is fixedly connected to the transmission box input shaft of the three-phase body I, the crank arm II is fixedly connected to the transmission box input shaft of the three-phase body II, and the transmission box input shaft of the three-phase body I and the transmission box input shaft of the three-phase body II are located on the same side of the first interphase pull rod. The first interphase pull rod of this optimization scheme drives the transmission box input shaft of the three-phase body II and the transmission box input shaft of the three-phase body I to rotate respectively through the crank arm, the structure is simple, the synchronization of the rotation of the two transmission box input shafts is high, and the transmission efficiency is improved.

[0009] As an optimization, the first interphase tie rod includes a transition tie rod and an extension tie rod which are coaxially arranged and connected by threads, the end of the transition tie rod away from the extension tie rod is hinged to the first ear seat, and the end of the extension tie rod away from the transition tie rod is hinged to the crank arm I. The first interphase tie rod structure of this optimization solution is convenient for adjusting the total length of the first interphase tie rod and better adapts to installation requirements.

[0010] As an optimization, a first limit support plate is also hinged on the first interphase pull rod, and one end of the first limit support plate away from the first interphase pull rod is hinged to the first base fixed to the main frame through a first hinge shaft, and the first hinge shaft is parallel to the rotating shaft. This optimization scheme forms support for the first interphase pull rod by setting the first limit support plate, limits the vibration of the first interphase pull rod during the opening and closing process, and improves the transmission efficiency.

[0011] As an optimization, a crank arm III is hinged on the second interphase pull rod, and the crank arm III is fixedly connected to the transmission box input shaft of the three-phase body III. The second interphase pull rod of the present application transmits power to the transmission box input shaft of the three-phase body III through the crank arm III, which has a simple structure and high power transmission reliability.

[0012] As an optimization, the main frame includes two grooved plates with openings arranged opposite to each other, and a plurality of connecting plates that fix the two grooved plates into one body. A receiving cavity for accommodating each transmission box is formed between the two grooved plates. The spacing between the tops of the two grooved plates is smaller than the width of the bottom connecting flanges of the three-phase body I, the three-phase body II, and the three-phase body III. Bolt holes that are respectively adapted to the bottom connecting flanges of the three-phase body I, the three-phase body II, and the three-phase body III are provided on the top of the grooved plates. The bottom surface of the grooved plates is supported on the top surface of the three-phase bracket and is fixed to the three-phase bracket by bolts. The main frame of this optimization scheme forms a structure with a receiving cavity in the middle to accommodate each transmission box, lower the center of gravity of the three-phase body, improve stability, and set bolt holes to facilitate bolt connection with each three-phase body, which is convenient for disassembly and assembly.

[0013] The beneficial effects of the present utility model are as follows: through the setting of the three-pronged crank arm, the first phase-to-phase pull rod and the second phase-to-phase pull rod are subjected to the same force type during the movement process, and are pulled or compressed at the same time. The faster opening process is all subjected to tension, and the slower closing process is all subjected to compression, which better adapts to the stress characteristics of the pull rod and significantly improves the transmission efficiency and service life of the transmission system. At the same time, due to the higher transmission efficiency, the required output force of the mechanism is smaller under the same circumstances, which further optimizes and improves the service life of the transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 A schematic diagram of the installation structure of the first interphase tie rod and the second interphase tie rod;

[0016] Figure 3 This is a schematic diagram of the main frame structure;

[0017] Figure 4 Schematic diagram of the structure of the first limit support plate;

[0018] Figure 5 Schematic diagram of the structure of the first limit support plate;

[0019] Figure 6 This is a partial enlarged view of the tripod arm;

[0020] Figure 7 This is a partial enlarged view of the crank arm II;

[0021] Figure 8 This is a partial enlarged view of the crank arm III;

[0022] Fig. 9 This is the schematic diagram of the open state position;

[0023] Fig.10 This is the schematic diagram of the closed state position.

[0024] As shown in the figure:

[0025] 1. Three-phase body I, 2. Three-phase body II, 3. Three-phase body III, 4. Main frame, 5. Crank arm I, 6. First limit support plate, 7. Crank arm II, 8. Three-pronged crank arm, 9. Second limit support plate, 10. Crank arm III, 11. Second interphase pull rod, 12. Output pull rod, 13. Three-phase bracket, 14. Transition pull rod, 15. Extension pull rod, 16. Mounting seat, 17. Rotating shaft, 18. Second ear seat, 19. First pin shaft, 20. First ear seat, 21. Second pin shaft, 22. First base. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0027] like Figure 1 A four-link transmission system for a double-acting high-voltage porcelain column circuit breaker is shown, and the transmission system includes a four-link unit, a support unit, a limit unit and a connection unit. The four-link unit is used to convert and transmit the output force of the mechanism; the support unit is used to bear the overall structure of the circuit breaker body, the bracket and the transmission system, and is an important component that integrates the circuit breaker into a whole; the limit unit is mainly used to limit the vibration of the phase-to-phase pull rod during the opening and closing process, thereby improving the transmission efficiency.

[0028] Specifically, the four-bar linkage transmission system of this embodiment includes a fixed main frame 4 and a tripod crank arm 8 rotatably connected to the main frame via a rotating shaft 17. The main frame 4 forms a supporting unit, and the tripod crank arm forms a connecting unit.

[0029] like Figure 3As shown, the main frame 4 includes two grooved plates with openings arranged opposite to each other, and a plurality of connecting plates that fix the two grooved plates into one body. The two ends of the connecting plates are respectively fixed to the two grooved plates by bolts. The grooved plates in this example are made of channel steel, which is convenient for material acquisition and production. A receiving cavity for accommodating each transmission box is formed between the two grooved plates, and operating holes are respectively provided on the side walls of the grooved plates, which are respectively opposite to the input shaft and the three-fork crank arm of each transmission box. The three-phase body Ⅰ1, the three-phase body Ⅱ2, and the three-phase body Ⅲ3 are arranged in sequence along a straight line and supported on the top of the grooved plate. The spacing between the tops of the two grooved plates is smaller than the bottom connecting flange width of the three-phase body Ⅰ, the three-phase body Ⅱ, and the three-phase body Ⅲ, and the top of the grooved plate is provided with bolt holes that are respectively adapted to the bottom connecting flanges of the three-phase body Ⅰ, the three-phase body Ⅱ, and the three-phase body Ⅲ, so as to facilitate the installation of each three-phase body. After installation, the bottom connecting flange of each three-phase body plays a role in strengthening the connection strength of the two grooved plates. The bottom surface of the grooved plate is supported on the top surface of the three-phase bracket 13, and the grooved plate and the three-phase bracket are fixedly connected by bolts.

[0030] like Figure 6 As shown, the three-pronged crank arm 8 includes a first ear seat 20, a second ear seat 18 and a third ear seat arranged in sequence along the circumferential direction. The first ear seat, the second ear seat and the third ear seat are all fixed on the central axis. The two ends of the central axis are rotatably connected to the mounting seat 16 through a rotating shaft 17 respectively. The mounting seat 16 is fixed to the main frame through bolts, and the rotating shaft is coaxially fixed to the central axis. The first ear seat 20 is hinged with a first interphase tie rod through a first pin shaft 19, the second ear seat 18 is hinged with an output tie rod 12 through a second pin shaft 21, and the third ear seat is hinged with a second interphase tie rod 11 through a third pin shaft. The first interphase tie rod and the second interphase tie rod are arranged in the horizontal direction, and the output tie rod 12 is arranged in the vertical direction.

[0031] The first pin 19, the second pin 21, and the third pin are all parallel to the rotating shaft 17, and the first pin and the third pin are respectively located on both sides of the rotating shaft. In this embodiment, the rotating shaft is horizontally arranged, and the first pin and the third pin are respectively located on the upper and lower sides of the horizontal plane where the rotating shaft is located. The first interphase pull rod is higher than the second interphase pull rod in the height direction. When the three-pronged crank arm rotates around the axis of the rotating shaft, a pulling force or a pushing force is formed on the first interphase pull rod and the second interphase pull rod, so that the first interphase pull rod and the second interphase pull rod are simultaneously pulled or compressed, thereby ensuring the consistency of the force type.

[0032] The first interphase pull rod is connected to the transmission box input shaft of the three-phase body Ⅰ1 and the transmission box input shaft of the three-phase body Ⅱ2, and the second interphase pull rod is connected to the transmission box input shaft of the three-phase body Ⅲ3. The rotating shaft is parallel to the input shaft of each transmission box, and the interphase pull rod is connected to the transmission box in the following way: when the three-pronged crank arm pulls the first interphase pull rod and the second interphase pull rod, the action of the input shaft of each transmission box corresponds to the opening of the gate, and when the three-pronged crank arm pushes the first interphase pull rod and the second interphase pull rod, the action of the input shaft of each transmission box corresponds to the closing of the gate. In this way, the first interphase pull rod and the second interphase pull rod are all subjected to tension during the opening process with a faster movement speed, and the first interphase pull rod and the second interphase pull rod are all subjected to pressure during the closing process with a slower speed, which better adapts to the stress characteristics of the pull rod.

[0033] The first interphase tie rod is hinged with a crank arm Ⅰ5 and a crank arm Ⅱ7, the crank arm Ⅰ is fixedly connected to the transmission box input shaft of the three-phase body Ⅰ1, the crank arm Ⅱ7 is fixedly connected to the transmission box input shaft of the three-phase body Ⅱ2, and the transmission box input shaft of the three-phase body Ⅰ and the transmission box input shaft of the three-phase body Ⅱ are located on the same side of the first interphase tie rod, and in this embodiment, they are both located on the lower side of the first interphase tie rod. Specifically, the crank arm Ⅰ is sleeved on the transmission box input shaft of the three-phase body Ⅰ, and is connected to the transmission box input shaft of the three-phase body Ⅰ through a key, the first interphase tie rod is hinged with the crank arm Ⅰ through the hinge shaft Ⅰ, and the distance between the axis of the hinge shaft Ⅰ and the axis of the transmission box input shaft of the three-phase body Ⅰ is a. Crank arm II is sleeved on the transmission box input shaft of the three-phase body II and is connected to the transmission box input shaft of the three-phase body II through a key. The first interphase pull rod is hinged to the crank arm II through the hinge shaft II. The distance between the axis of the hinge shaft II and the axis of the transmission box input shaft of the three-phase body II is b, and b is equal to a, that is, the rotation radius of the crank arm I is equal to that of the crank arm II, and the hinge shaft I and the hinge shaft II are parallel to the rotating shaft.

[0034] Since the first interphase tie rod is relatively long, the first interphase tie rod of this embodiment includes a transition tie rod 14 and an extension tie rod 15 which are coaxially arranged and threadedly connected, the end of the transition tie rod away from the extension tie rod is hinged to the first ear seat, and the end of the extension tie rod away from the transition tie rod is hinged to the crank arm I. The output tie rod, the transition tie rod 14, the extension tie rod 15 and the second interphase tie rod form a four-bar unit to achieve force transmission.

[0035] like Figure 4 As shown, the first interphase tie rod is also hinged with a first limit support plate 6, which is located below the first interphase tie rod. The end of the first limit support plate 6 away from the first interphase tie rod is hinged to the first base 22 fixed to the main frame through a first hinge shaft, and the first hinge shaft is parallel to the rotating shaft. The rotation radius of the first limit support plate is equal to that of the crank arm I and crank arm II. In order to improve stability, the first limit support plate is divided into two pieces, which are respectively located on both sides of the first base. For the convenience of connection, a fixed seat is fixed on the first interphase tie rod, and the upper end of the first limit support plate is hinged to the fixed seat.

[0036] The second interphase tie rod 11 is hinged with a crank arm Ⅲ10 through a hinge shaft Ⅲ. The crank arm Ⅲ10 is fixedly connected to the transmission box input shaft of the three-phase body Ⅲ. The hinge shaft Ⅲ is parallel to the transmission box input shaft of the three-phase body Ⅲ. In this embodiment, the crank arm Ⅲ10 is sleeved on the transmission box input shaft of the three-phase body Ⅲ and is fixed to the transmission box input shaft of the three-phase body Ⅲ through a key connection. The second interphase tie rod is located below the transmission box input shaft of the three-phase body Ⅲ. Figure 5 As shown, a second limiting support plate 9 is also hinged on the second interphase tie rod, and the second limiting support plate 9 is located above the second interphase tie rod. The second limiting support plate 9 is hinged to the second base fixed to the main frame through a second hinge shaft at one end away from the second interphase tie rod. The second hinge shaft is parallel to the rotating shaft, and the rotation radius of the second limiting support plate is equal to that of the crank arm III. The first limiting support plate and the second limiting support plate form a limiting unit to limit the vibration of each interphase tie rod during the opening and closing process, thereby improving the transmission efficiency.

[0037] The output rod of this embodiment is connected to the first interphase rod and the second interphase rod through a three-pronged crank arm, respectively, to convert the output force of the mechanism into a force in a perpendicular direction. During the closing process, the output rod outputs force to the three-pronged crank arm, and the three-pronged crank arm applies force to the first interphase rod and the second interphase rod, and the forces on the first interphase rod and the second interphase rod are both pressure; the opening process is the reverse process, and the forces on the first interphase rod and the second interphase rod are both tension.

[0038] The transmission system of this embodiment changes the linear transmission structure of the conventional porcelain column circuit breaker, so that the phase-to-phase pull rods are subjected to the same force during the movement process, and the faster opening process is all subjected to tension, while the slower closing process is all subjected to pressure. This design adapts to the stress characteristics of the pull rods, significantly improves the transmission efficiency and service life of the transmission system. At the same time, the introduction of phase-to-phase support reduces the vibration of the phase-to-phase pull rods and further improves the transmission efficiency. Under the same circumstances, the required mechanism output force is smaller, which further optimizes and improves the service life of the transmission system.

[0039] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A four-link transmission system for a double-acting high-voltage porcelain column circuit breaker, characterized in that: It comprises a fixed main frame (4), and a three-pronged crank arm (8) rotatably connected to the main frame via a rotating shaft, the three-pronged crank arm (8) comprising a first ear seat, a second ear seat and a third ear seat arranged in sequence along the circumferential direction, the first ear seat being hingedly connected to a first interphase pull rod via a first pin shaft, the second ear seat being hingedly connected to an output pull rod (12) via a second pin shaft, and the third ear seat being hingedly connected to a second interphase pull rod (11) via a third pin shaft; The first pin shaft, the second pin shaft, and the third pin shaft are all parallel to the rotating shaft, and the first pin shaft and the third pin shaft are respectively located on both sides of the rotating shaft; The first interphase pull rod is drivingly connected to the transmission box input shaft of the three-phase body Ⅰ (1) and the transmission box input shaft of the three-phase body Ⅱ (2), and the second interphase pull rod is drivingly connected to the transmission box input shaft of the three-phase body Ⅲ (3).

2. A four-link transmission system for a double-acting high-voltage porcelain column circuit breaker according to claim 1, characterized in that: A crank arm I (5) and a crank arm II (7) are hingedly connected to the first interphase pull rod, the crank arm I is fixedly connected to the transmission box input shaft of the three-phase body I (1), the crank arm II (7) is fixedly connected to the transmission box input shaft of the three-phase body II (2), and the transmission box input shaft of the three-phase body I and the transmission box input shaft of the three-phase body II are located on the same side of the first interphase pull rod.

3. A four-link transmission system for a double-acting high-voltage porcelain column circuit breaker according to claim 2, characterized in that: The first interphase pull rod comprises a transition pull rod (14) and an extension pull rod (15) which are coaxially arranged and threadedly connected, wherein one end of the transition pull rod away from the extension pull rod is hinged to the first ear seat, and one end of the extension pull rod away from the transition pull rod is hinged to the crank arm I.

4. A four-link transmission system for a double-acting high-voltage porcelain column circuit breaker according to claim 1, characterized in that: A first position-limiting support plate (6) is also hingedly connected to the first interphase pull rod, and one end of the first position-limiting support plate (6) away from the first interphase pull rod is hingedly connected to a first base fixed to the main frame via a first hinge shaft, and the first hinge shaft is parallel to the rotating shaft.

5. A four-link transmission system for a double-acting high-voltage porcelain column circuit breaker according to claim 1, characterized in that: A crank arm III (10) is hingedly connected to the second interphase pull rod (11), and the crank arm III (10) is fixedly connected to the transmission box input shaft of the three-phase body III.

6. A four-link transmission system for a double-acting high-voltage porcelain column circuit breaker according to claim 1, characterized in that: The main frame (4) comprises two grooved plates with openings arranged opposite to each other, and a plurality of connecting plates that fix the two grooved plates into one body, a receiving cavity for accommodating each transmission box is formed between the two grooved plates, the spacing between the tops of the two grooved plates is smaller than the width of the bottom connecting flanges of the three-phase body I, the three-phase body II, and the three-phase body III, and bolt holes are provided on the tops of the grooved plates that are respectively matched with the bottom connecting flanges of the three-phase body I, the three-phase body II, and the three-phase body III, and the bottom surface of the grooved plate is supported on the top surface of the three-phase bracket and is fixed to the three-phase bracket by bolts.

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