Double-acting transmission structure and resistor-equipped arc extinguish chamber using same

Abstract

The invention discloses a double-acting transmission structure and an arc extinguish chamber with a resistor using the same, and belongs to the technical field of high-voltage circuit breakers. The structure comprises a fixed seat, a transmission connecting rod assembly composed of a plurality of crank arms, a transmission pull rod connected with a static end support of the arc extinguish chamber, and a moving contact arranged in a sliding manner. The core is that when the main transmission shaft acts, the movable contact and the static contact can be simultaneously driven to move in opposite directions through folding and unfolding of the crank arm connecting rod, so that bidirectional switching-on and switching-off are realized. According to the design, a traditionally required single long stroke is decomposed into bidirectional relative movement, the stroke of the main transmission shaft is remarkably shortened, the requirements for the output speed and driving force of an operating mechanism are reduced, the opening and closing speed is improved, and miniaturization and performance optimization of the overall structure of the arc extinguish chamber and the circuit breaker are facilitated.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more specifically to a double-acting transmission structure and a resistive arc-extinguishing chamber using the structure. Background Technology

[0002] With the widespread application of gas-insulated metal-enclosed switchgear (GIS) in power systems, circuit breakers, as key breaking and closing components, are crucial to the safe and stable operation of the entire power grid. The arc-extinguishing chamber is the core component of the circuit breaker, its function being to quickly and reliably interrupt fault currents and load currents. Depending on their operating principles, arc-extinguishing chambers are mainly of various types, including self-powered and compressed air types, requiring corresponding transmission systems to achieve efficient opening and closing operations.

[0003] In high-voltage and ultra-high-voltage (such as 500kV and above) power systems, circuit breakers are typically equipped with closing resistors. As a critical protective component, the closing resistor's main function is to suppress operational overvoltages generated during closing operations. By connecting to the circuit in stages, it effectively absorbs and dissipates electromagnetic oscillation energy, limiting the overvoltage amplitude to within the system's insulation withstand level, thereby protecting electrical equipment from damage.

[0004] Currently, traditional circuit breakers mostly employ a single-acting transmission structure, meaning that only the moving contact of the arc-extinguishing chamber is driven in one direction to complete the opening and closing. This structure has certain limitations: to achieve the specified opening distance and insulation requirements, the moving contact needs a long stroke, which not only results in a larger overall size of the arc-extinguishing chamber but also places higher demands on the output speed and power of the operating mechanism. Furthermore, in arc-extinguishing chambers with resistors, coordinating the timing of the main contact and the resistor contact (typically requiring the resistor to be engaged first and the main contact to close during closing; and the resistor to be disengaged first and the main contact to separate during opening) also becomes a design challenge. The long transmission stroke and high dependence on mechanism speed not only increase manufacturing costs and the burden on the mechanism but may also affect the circuit breaker's opening and closing speed and overall breaking performance.

[0005] Therefore, there is an urgent need in this field for an innovative transmission structure that can effectively shorten the transmission stroke, reduce the performance requirements of the operating mechanism, and optimize the coordinated action sequence of the main contact and the resistance contact, so as to achieve the goals of miniaturization, high performance and high reliability of the circuit breaker. Summary of the Invention

[0006] In view of this, the present invention provides a double-acting transmission structure and a resistive arc-extinguishing chamber using the structure, aiming to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A double-acting transmission structure and a resistive arc-extinguishing chamber using the structure, comprising: The fixing base consists of a base plate and two support rods fixed on both sides of the base plate; Two sets of transmission linkage assemblies, each set of the transmission linkage assemblies consists of a first crank arm and a second crank arm and a third crank arm hinged to both ends of the first crank arm. The two first crank arms of the two sets of the transmission linkage assemblies are respectively hinged to the ends of the two support rods. The arc-extinguishing chamber stationary end support and the fixed connecting plate are connected by two transmission rods. The stationary end support of the arc-extinguishing chamber has a stationary contact. The ends of the two transmission rods connected to the fixed connecting plate are respectively hinged to the ends of the two second crank arms. A movable contact is slidably connected to the two transmission rods. The movable contact is opposite to the stationary contact and can be engaged and disengaged from the stationary contact. The top of the movable contact slides through the fixed connecting plate and is hinged to the ends of the third crank arm on both sides. The top of the movable contact is connected to a main drive shaft that passes through the base plate. When the main drive shaft pushes / pulls, the first crank arm, the second crank arm, and the third crank arm can be folded or unfolded, thereby enabling the movable contact and the stationary contact to move closer and separate in both directions.

[0008] Through the above technical solution, the dual-action transmission structure provided by the present invention achieves bidirectional synchronous movement of the moving and stationary contacts of the arc-extinguishing chamber through a clever crank arm linkage design. It decomposes the contact stroke of the traditional unidirectional movement into bidirectional relative movement, thereby significantly shortening the operating stroke required by the main drive shaft without reducing the opening distance, reducing the requirements for the output speed and driving force of the operating mechanism, and improving the opening and closing speed. This is beneficial to the miniaturization and performance optimization of the arc-extinguishing chamber and the overall structure of the circuit breaker.

[0009] Preferably, in the above-mentioned double-action transmission structure and the resistive arc-extinguishing chamber using the structure, the end of the transmission rod is connected to the end of the second crank arm by a pin, and the ends of the first crank arm, the second crank arm, and the third crank arm are connected by pins; the end of the second crank arm is connected to the end of the support rod by a pin, and the end of the third crank arm is connected to the top rod of the moving contact by a pin.

[0010] Preferably, in the above-mentioned double-acting transmission structure and the resistive arc-extinguishing chamber using the structure, the top end of the moving contact is hinged to the main drive shaft.

[0011] Preferably, in the above-mentioned double-action transmission structure and the resistive arc-extinguishing chamber using the structure, when the main drive shaft pushes the first crank arm, the second crank arm, and the third crank arm to move from the unfolded state to the folded state, the first crank arm rotates around the end of the support rod, causing the second crank arm to pull the transmission rod towards the fixed seat, and the moving contact moves away from the fixed seat, thereby realizing the closing of the moving contact and the stationary contact.

[0012] Preferably, in the above-mentioned double-action transmission structure and the resistive arc-extinguishing chamber using the structure, when the main drive shaft pulls the first crank arm, the second crank arm, and the third crank arm from the folded state to the unfolded state, the first crank arm rotates around the end of the support rod, causing the second crank arm to push the transmission rod to move away from the fixed seat, and the moving contact moves towards the fixed seat, thereby realizing the opening of the moving contact and the stationary contact.

[0013] Preferably, in the above-mentioned double-acting transmission structure and the resistive arc-extinguishing chamber using the structure, a resistive break stationary contact fixed on the stationary end support of the arc-extinguishing chamber is further included, and a resistive port moving contact corresponding to the resistive break stationary contact is fixed on the top rod of the moving contact.

[0014] Preferably, in the above-mentioned double-action transmission structure and the resistive arc-extinguishing chamber using the structure, the moving contact of the resistive port is fixed to the top rod of the moving contact via a resistive crank arm.

[0015] Preferably, in the above-mentioned double-action transmission structure and the resistive arc-extinguishing chamber using the structure, the fixed position of the resistive crank arm is located between the hinge point of the fixed connecting plate and the third crank arm and the top rod of the moving contact.

[0016] Preferably, in the above-mentioned double-acting transmission structure and the resistive arc-extinguishing chamber using the structure, the break-off stroke of the moving contact at the resistor port and the stationary contact at the resistor break-off point is less than the break-off stroke of the moving contact and the stationary contact.

[0017] Preferably, in the above-mentioned double-acting transmission structure and the resistive arc-extinguishing chamber using the structure, the moving contact of the resistor port and the stationary contact of the resistor break port close before the moving contact and the stationary contact, and open before the moving contact and the stationary contact.

[0018] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a double-action transmission structure and a resistive arc-extinguishing chamber using the structure, which has the following beneficial effects: 1. Significantly improve transmission efficiency: Through innovative linkage mechanism design, bidirectional synchronous movement of moving and stationary contacts is achieved, decomposing the required opening distance into bidirectional stroke, thereby greatly shortening the unidirectional movement stroke of the main drive shaft.

[0019] 2. Reduced requirements on the operating mechanism: The shortened stroke directly reduces the requirements on the output speed, power and mechanical load of the operating mechanism, which helps to extend the service life of the mechanism and reduce costs.

[0020] 3. Optimize the timing sequence of resistor break action: Through a clever installation structure, it effectively suppresses closing overvoltage and transfers the arc during opening, thereby enhancing the system protection performance.

[0021] 4. Promote product miniaturization and high performance: The improvement of transmission efficiency and the reduction of stroke make it possible to miniaturize the arc-extinguishing chamber and even the entire circuit breaker structure, while improving the opening and closing speed and overall reliability. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 The attached figure is a schematic diagram of the double-acting transmission structure of Embodiment 1 provided by the present invention and the closed state of the resistive arc-extinguishing chamber using the structure; Figure 2 The attached figure is a schematic diagram of the double-acting transmission structure of Embodiment 1 provided by the present invention and the opening state of the resistive arc-extinguishing chamber using the structure. Figure 3 The attached figure is a schematic diagram of the double-acting transmission structure of Embodiment 2 provided by the present invention and the closed state of the resistive arc-extinguishing chamber using the structure; Figure 4 The attached figure is a schematic diagram of the double-acting transmission structure of Embodiment 2 provided by the present invention and the opening state of the resistive arc-extinguishing chamber using the structure.

[0024] in: 1-Main drive shaft; 2-Fixed base; 3-Third crank arm; 4-Second crank arm; 5-First crank arm; 6-Fixed connecting plate; 7-Shaft pin; 8-Transmission tie rod; 9-Arc extinguishing chamber stationary end support; 10-Moving contact; 11-Stationary contact; 12-Resistor break stationary contact; 13-Resistor port moving contact; 14-Resistor crank arm; 15-Base plate; 16-Support rod; 17-Transmission link assembly. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1: See appendix Figure 1 and attached Figure 2 This invention discloses a double-acting transmission structure and a resistive arc-extinguishing chamber using the structure, comprising: The fixing base 2 consists of a base plate 15 and two support rods 16 fixed on both sides of the base plate 15. Two sets of transmission linkage assemblies 17, each set of transmission linkage assemblies 17 is composed of a first crank arm 5 and a second crank arm 4 and a third crank arm 3 hinged at both ends of the first crank arm 5. The two first crank arms 5 of the two sets of transmission linkage assemblies 17 are respectively hinged to the ends of two support rods 16. The arc-extinguishing chamber stationary end support 9 and the fixed connecting plate 6 are connected by two transmission rods 8. The stationary end support 9 of the arc-extinguishing chamber has a stationary contact 11. The ends of the two transmission rods 8 connected to the fixed connecting plate 6 are respectively hinged to the ends of the two second crank arms 4. The moving contact 10 is slidably connected to the two transmission rods 8. The moving contact 10 is opposite to the stationary contact 11 and can be inserted and separated from the stationary contact 11. The top rod of the moving contact 10 slides through the fixed connecting plate 6 and is hinged to the ends of the third crank arm 3 on both sides. The top of the moving contact 10 is connected to the main drive shaft 1 that passes through the base plate 15. When the main drive shaft 1 performs a push / pull action, the first crank arm 5, the second crank arm 4 and the third crank arm 3 can be folded or unfolded, thereby enabling the moving contact 10 and the stationary contact 11 to achieve bidirectional approach and separation actions.

[0027] To further optimize the above technical solution, the end of the transmission rod 8 is connected to the end of the second crank arm 4 by a pin 7, and the ends of the first crank arm 5, the second crank arm 4 and the third crank arm 3 are connected by a pin 7; the end of the second crank arm 4 is connected to the end of the support rod 16 by a pin 7, and the end of the third crank arm 3 is connected to the top rod of the moving contact 10 by a pin 7.

[0028] To further optimize the above technical solution, the top of the moving contact 10 is hinged to the main drive shaft 1.

[0029] To further optimize the above technical solution, when the main drive shaft 1 pushes the first crank arm 5, the second crank arm 4 and the third crank arm 3 from the unfolded state to the folded state, the first crank arm 5 rotates around the end of the support rod 16, causing the second crank arm 4 to pull the transmission rod 8 to move towards the fixed seat 2, and the moving contact 10 to move away from the fixed seat 2, thereby realizing the closing of the moving contact 10 and the stationary contact 11.

[0030] To further optimize the above technical solution, when the main drive shaft 1 pulls the first crank arm 5, the second crank arm 4 and the third crank arm 3 from the folded state to the unfolded state, the first crank arm 5 rotates around the end of the support rod 16, causing the second crank arm 4 to push the transmission rod 8 to move away from the fixed seat 2, and the moving contact 10 to move closer to the fixed seat 2, thereby realizing the opening of the moving contact 10 and the stationary contact 11.

[0031] As attached Figure 1 and attached Figure 2 As shown, the working principle of the double-action transmission structure in this embodiment is as follows: Closing Process: When the circuit breaker needs to be closed, the operating mechanism drives the main drive shaft 1 to the left. The main drive shaft 1 drives the connected moving contact 10 to move to the left as a whole. At the same time, the main drive shaft 1 pushes the first crank arm 5 to rotate clockwise around its hinge point with the support rod 16 through the pin 7. The rotation of the first crank arm 5, through the hinge points at both ends, drives the second crank arm 4 and the third crank arm 3 connected to it to move, so that the transmission linkage assembly 17 composed of the first crank arm 5, the second crank arm 4 and the third crank arm 3 moves from the unfolded state to the folded state.

[0032] During this process: the second crank arm 4 pulls the transmission rod 8, which is hinged to it, to move to the right. The transmission rod 8 drives the fixed connecting plate 6 and the arc-extinguishing chamber stationary end support 9, which is fixed to it, to move together to the right, thereby causing the stationary contact 11, which is fixed on the arc-extinguishing chamber stationary end support 9, to move to the right. At the same time, the third crank arm 3 pushes the top rod of the moving contact 10, which is hinged to it, to move to the left.

[0033] Therefore, under the unidirectional drive of the main drive shaft 1, the moving contact 10 moves to the left, while the stationary contact 11 moves to the right, realizing the simultaneous movement of both moving and stationary contacts towards the closing position, i.e., bidirectional closing movement. This effectively shortens the stroke of the main drive shaft 1 required to achieve the specified opening distance and improves the closing speed.

[0034] Opening process: When the circuit breaker needs to be opened, the operating mechanism drives the main drive shaft 1 to pull to the right. The action is the reverse of the closing process. The main drive shaft 1 pulls the moving contact 10 to the right, and through the first crank arm 5, it rotates counterclockwise around the fulcrum, and the transmission linkage assembly 17 moves from the folded state to the unfolded state. The second crank arm 4 pushes the transmission rod 8 to the left, which in turn drives the stationary contact 11 to move to the left. The third crank arm 3 pulls the top rod of the moving contact 10 to the right. Finally, the moving contact 10 moves to the right, and the stationary contact 11 moves to the left, realizing the simultaneous movement of the moving and stationary contacts to the opening position, that is, bidirectional opening movement, thereby quickly establishing the insulation gap.

[0035] Example 2: See appendix Figure 3 and attached Figure 4 This embodiment is further designed based on embodiment 1: it also includes a resistor break stationary contact 12 fixed on the stationary end support 9 of the arc extinguishing chamber, and a resistor port moving contact 13 corresponding to the resistor break stationary contact 12 is fixed on the top rod of the moving contact 10.

[0036] To further optimize the above technical solution, the moving contact 13 of the resistor port is fixed to the top rod of the moving contact 10 via the resistor crank arm 14.

[0037] To further optimize the above technical solution, the fixed position of the resistor crank arm 14 is located between the hinge point of the fixed connecting plate 6 and the third crank arm 3 and the top rod of the moving contact 10.

[0038] To further optimize the above technical solution, the break-off stroke of the moving contact 13 of the resistor port and the stationary contact 12 of the resistor break-off point is less than the break-off stroke of the moving contact 10 and the stationary contact 11.

[0039] To further optimize the above technical solution, the moving contact 13 of the resistor port and the stationary contact 12 of the resistor break are closed before the moving contact 10 and the stationary contact 11, and are opened before the moving contact 10 and the stationary contact 11.

[0040] As attached Figure 3 and attached Figure 4 As shown, this embodiment adds a resistance break assembly to the existing embodiment 1. Its working principle includes the aforementioned double-action transmission process, and also features a specific action sequence of the resistance break assembly: Closing Process: When the main drive shaft 1 is pushed to the left, driving the entire system to close, the moving contact 10 and the stationary contact 11 perform bidirectional closing motion as in Embodiment 1. Simultaneously, the moving contact 13 of the resistor port, fixed to the moving contact 10, also moves to the left. Due to the specific installation position of the resistor crank arm 14, the starting point of the movement of the resistor port moving contact 13 is further forward than that of the moving contact 10 rod. Therefore, during the closing motion, the resistor port moving contact 13 will contact the resistor break stationary contact 12 before the main body of the moving contact 10, meaning the resistor break closes before the main break.

[0041] Opening process: When the main drive shaft 1 is pulled to the right, driving the entire system to open, the moving contact 10 and the stationary contact 11 perform bidirectional opening movements. Similarly, due to the fixed position relationship of the moving contact 13 of the resistor port through the resistor crank arm 14, when the moving contact 10 begins to move to the right, the moving contact 13 of the resistor port will first separate from the stationary contact 12 of the resistor break, that is, the resistor break opens before the main break.

[0042] By setting the resistor crank arm 14 and rationally designing its installation position, the effective travel between the moving contact 13 of the resistor port and the stationary contact 12 of the resistor break is less than the main break travel between the moving contact 10 and the stationary contact 11. This allows for early circuit connection to suppress inrush current during closing and early disconnection during opening to transfer the arc, thus providing effective protection for the system before and after the main break operates.

[0043] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-acting transmission structure and a resistive arc-extinguishing chamber using the structure, characterized in that, include: The fixing base (2) is composed of a base plate (15) and two support rods (16) fixed on both sides of the base plate (15); Two sets of transmission linkage assemblies (17), each set of transmission linkage assemblies (17) consists of a first crank arm (5) and a second crank arm (4) and a third crank arm (3) hinged at both ends of the first crank arm (5). The two first crank arms (5) of the two sets of transmission linkage assemblies (17) are respectively hinged to the ends of the two support rods (16). The arc-extinguishing chamber stationary end support (9) and the fixed connecting plate (6) are connected by two transmission rods (8). The stationary end support (9) of the arc-extinguishing chamber has a stationary contact (11). The ends of the two transmission rods (8) connected to the fixed connecting plate (6) are respectively hinged to the ends of the two second crank arms (4). A movable contact (10) is slidably connected to the two transmission rods (8). The movable contact (10) is opposite to the stationary contact (11) and can be inserted and separated from the stationary contact (11). The top rod of the movable contact (10) slides through the fixed connecting plate (6) and is hinged to the ends of the third crank arm (3) on both sides. The top of the movable contact (10) is connected to the main drive shaft (1) that passes through the base plate (15). When the main drive shaft (1) performs a push / pull action, the first crank arm (5), the second crank arm (4) and the third crank arm (3) can be folded or unfolded, thereby enabling the movable contact (10) and the stationary contact (11) to achieve bidirectional approach and separation actions.

2. The double-acting transmission structure according to claim 1 and the resistive arc-extinguishing chamber using the structure, characterized in that, The end of the transmission rod (8) is connected to the end of the second crank arm (4) by a pin (7), and the ends of the first crank arm (5), the second crank arm (4) and the third crank arm (3) are connected by a pin (7); the end of the second crank arm (4) and the support rod (16) are connected by a pin (7), and the end of the third crank arm (3) is connected to the top rod of the moving contact (10) by a pin (7).

3. The double-acting transmission structure according to claim 1 and the resistive arc-extinguishing chamber using the structure, characterized in that, The top end of the moving contact (10) is hinged to the main drive shaft (1).

4. The double-acting transmission structure according to claim 1 and the resistive arc-extinguishing chamber using the structure, characterized in that, When the main drive shaft (1) pushes the first crank arm (5), the second crank arm (4) and the third crank arm (3) from the unfolded state to the folded state, the first crank arm (5) rotates around the end of the support rod (16), causing the second crank arm (4) to pull the transmission rod (8) towards the fixed seat (2), and the moving contact (10) moves away from the fixed seat (2), thereby realizing the closing of the moving contact (10) and the stationary contact (11).

5. The double-acting transmission structure according to claim 1 and the resistive arc-extinguishing chamber using the structure, characterized in that, When the main drive shaft (1) pulls the first crank arm (5), the second crank arm (4) and the third crank arm (3) from the folded state to the unfolded state, the first crank arm (5) rotates around the end of the support rod (16), causing the second crank arm (4) to push the transmission rod (8) to move away from the fixed seat (2), and the moving contact (10) to move closer to the fixed seat (2), thereby realizing the opening of the moving contact (10) and the stationary contact (11).

6. A double-acting transmission structure according to any one of claims 1-5 and a resistive arc-extinguishing chamber using the structure, characterized in that, It also includes a resistor break stationary contact (12) fixed on the stationary end support (9) of the arc extinguishing chamber, and a resistor port moving contact (13) corresponding to the resistor break stationary contact (12) is fixed on the top rod of the moving contact (10).

7. The double-acting transmission structure according to claim 6 and the resistive arc-extinguishing chamber using the structure, characterized in that, The moving contact (13) of the resistor port is fixed to the top rod of the moving contact (10) by a resistor crank (14).

8. The double-acting transmission structure according to claim 7 and the resistive arc-extinguishing chamber using the structure, characterized in that, The fixed position of the resistor crank arm (14) is located between the hinge point of the fixed connecting plate (6) and the third crank arm (3) and the top rod of the moving contact (10).

9. A double-acting transmission structure according to claim 8 and a resistive arc-extinguishing chamber using the structure, characterized in that, The break-off travel of the moving contact (13) of the resistor port and the stationary contact (12) of the resistor break-off is less than that of the moving contact (10) and the stationary contact (11).

10. A double-acting transmission structure according to claim 9 and a resistive arc-extinguishing chamber using the structure, characterized in that, The moving contact (13) of the resistor port and the stationary contact (12) of the resistor break are closed before the moving contact (10) and the stationary contact (11), and are opened before the moving contact (10) and the stationary contact (11).

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