Double-acting pneumatic piston circuit breaker and working method thereof

Abstract

The invention belongs to the field of circuit breakers, and discloses a double-acting air compression piston circuit breaker and a working method thereof.The double-acting air compression piston circuit breaker comprises a driving piston and a driven piston which are arranged on a circuit breaker body, the driving piston and the driven piston form an air compression chamber together with the inner wall of an air compression cylinder, and reverse movement is achieved through a piston rod and a transmission device; by adopting the circuit breaker, the mode that in a traditional circuit breaker, the relative movement speed of a piston and an air cylinder is increased or the volume of an air compression chamber is increased or the movement stroke is increased to build pressure so as to improve the breaking performance is avoided, so that the increase of operation work is reduced, the size of the circuit breaker is reduced, and the mechanical reliability of the circuit breaker and a mechanism is improved; meanwhile, through the reverse movement of the driving piston and the driven piston, the volume change of the air compression chamber is more effectively utilized to establish pressure, and the increase of the speed does not need to be excessively depended on, so that the higher pressure building effect and the breaking capacity can be achieved on the premise that the operation work is not obviously improved, and the performance of the circuit breaker is obviously optimized.

Description

Technical Field

[0001] The present invention belongs to the field of circuit breakers, and particularly relates to a double-acting pneumatic piston circuit breaker and its working method. Background Art

[0002] The arc extinguishing chamber is a core component of a high-voltage switch circuit breaker, which has a decisive impact on the opening performance, reliability, operating power, economy, etc. of the circuit breaker. At present, the structures of arc extinguishing chambers at home and abroad generally use two types: single-acting and double-acting. In the single-acting type, the moving end of the arc extinguishing chamber moves under the drive of the driving mechanism to complete the opening and closing process; in the double-acting arc extinguishing chamber, not only does the moving end move, but also some components at the fixed end of the arc extinguishing chamber can move. The advantage of the double-acting arc extinguishing chamber is that through the relative movement of the moving and static ends, the movement speed of the moving arc extinguishing chamber can be increased, the dynamic electric field distribution at the break is optimized, the operating power of the circuit breaker is reduced, the reliability and stability of the product are improved, and the product cost is reduced. Therefore, the double-acting arc extinguishing chamber has been widely used in engineering in the field of high-voltage switches.

[0003] Existing self-energizing and pneumatic circuit breakers at home and abroad generally adopt a pneumatic cylinder structure with unilateral piston movement, and establish the gas pressure required for arc extinguishing through the relative movement between the pneumatic piston and the pneumatic cylinder. For ultra-high voltage and extra-high voltage power grids, the rated voltage level of the product is higher and the rated breaking current is larger, requiring the arc extinguishing chamber to have greater gas blowing capacity and higher breaking speed. In order to meet the requirements of breaking capacity, whether it is a pneumatic arc extinguishing chamber or a self-energizing arc extinguishing chamber, usually the opening and closing speed is increased, the movement stroke is increased, or the pneumatic cylinder is enlarged to improve the breaking performance. The above methods will inevitably lead to an increase in operating power or an increase in product size, resulting in a series of problems such as increased cost, increased vibration, and reduced stability. Summary of the Invention

[0004] The present invention provides a double-acting pneumatic piston circuit breaker and its working method to solve the technical problems that existing circuit breakers improve the pressure building capacity of the pneumatic cylinder by increasing speed, enlarging the pneumatic cylinder or increasing the movement stroke, resulting in reduced stability of the circuit breaker and increased product size due to the increase in operating power or stroke.

[0005] To achieve the above object, the present invention adopts the following technical content: A double-acting pneumatic piston circuit breaker includes a circuit breaker body; An active piston and a driven piston are arranged on the circuit breaker body; The active piston, the driven piston and the inner wall of the pneumatic cylinder enclose a pneumatic chamber; The active piston is connected to a piston rod; The driven piston is connected to the piston rod through a transmission device; The piston rod can drive the reverse movement between the active piston and the driven piston.

[0006] Further, the transmission device includes a guide rod, a fixed block, a connecting rod, a first pin, a second pin and a first rotating pin; The guide rod is fixedly connected to the driven piston and is arranged parallel to the piston rod; The first pin is simultaneously inserted into the first strip-shaped hole of the connecting rod and the fixed block in a movable manner; The second pin is simultaneously inserted into the second strip-shaped hole of the connecting rod and the guide groove of the guide rod in a movable manner; The fixed block is fixedly connected to the outer wall of the piston rod; The first rotating pin is fixed to the inner wall of the pressure cylinder and is inserted into the connecting rod in a movable manner; the connecting rod can rotate along the first rotating pin under the drive of the piston rod.

[0007] Further, the transmission device includes a guide rod, a fixed block, a special-shaped connecting rod, a first pin, a second pin and a first rotating pin; The guide rod is fixedly connected to the driven piston and is arranged parallel to the piston rod; The first pin is simultaneously inserted into the first strip-shaped hole of the special-shaped connecting rod and the fixed block in a movable manner; The second pin is simultaneously inserted into the second strip-shaped hole of the special-shaped connecting rod and the guide groove of the guide rod in a movable manner; The fixed block is fixedly connected to the outer wall of the piston rod; The first rotating pin is fixed to the inner wall of the pressure cylinder and is inserted into the special-shaped connecting rod in a movable manner; the special-shaped connecting rod can rotate along the first rotating pin under the drive of the piston rod.

[0008] Further, the transmission device includes a sleeve, a first guide groove, a second guide groove and a second rotating pin; One end of the sleeve is connected to the driven piston, and the whole sleeve is sleeved outside the piston rod; The first guide groove is opened in a spiral direction along the rod wall of the piston rod; The second guide groove is opened in a spiral direction along the cylinder wall of the sleeve; The first guide groove and the second guide groove are in opposite directions; The second rotating pin is simultaneously inserted into the first guide groove and the second guide groove; The piston rod can drive the second guide groove to move in the opposite direction by the movement of the second rotating pin in the first guide groove.

[0009] Further, the transmission device includes a first rack, a second rack and a gear; The first rack is fixedly connected to the driven piston; The second rack is fixedly connected to the outer wall of the piston rod; The gear is fixedly connected to the inner wall of the pressure cylinder; The first rack and the second rack are meshed and connected through the gear.

[0010] Further, the first rack, the second rack and the piston rod are all arranged in parallel.

[0011] Further, a guide sleeve is sleeved on the outer wall of the driven piston.

[0012] Further, the driven piston is sleeved between the outer wall of the piston rod and the inner wall of the pressure cylinder.

[0013] Further, the driven piston is connected to the piston rod through at least two sets of transmission devices; When there are two sets of transmission devices, the two sets of transmission devices are symmetrically arranged; When the number of transmission devices is greater than two, multiple sets of transmission devices are uniformly arranged along the piston rod.

[0014] A working method of a double-acting pneumatic piston circuit breaker, based on the above double-acting pneumatic piston circuit breaker, includes: The piston rod drives the active piston to move, and at the same time drives the driven piston to move in the opposite direction through the transmission device, so that the active piston, the driven piston and the inner wall of the pressure cylinder jointly establish the pressure in the pneumatic chamber.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a double-acting pneumatic piston circuit breaker, which includes an active piston and a driven piston arranged on the circuit breaker body. The two jointly form a pneumatic chamber with the inner wall of the pressure cylinder, and realize reverse movement through the piston rod and the transmission device; adopting this circuit breaker avoids the method of simply relying on increasing the relative movement speed of the piston and the pressure cylinder, or increasing the volume of the pneumatic chamber, or increasing the movement stroke to establish pressure in the traditional circuit breaker, thereby reducing the increase of operating work and the increase of product size, improving the mechanical reliability of the circuit breaker and the mechanism, and achieving the goal of product miniaturization; at the same time, through the reverse movement of the active piston and the driven piston, the volume change of the pneumatic chamber is more effectively utilized to establish pressure, without relying too much on the increase of speed. Therefore, it is possible to achieve a higher breaking capacity and pressure establishment effect without significantly increasing the operating work, effectively solving the problems of increased cost, increased vibration, and reduced stability in the prior art, and significantly optimizing the performance of the circuit breaker.

[0016] Preferably, in the present invention, the transmission device includes components such as a guide rod, a fixed block, a connecting rod, a shaft pin, and a rotating pin, realizing the precise reverse movement of the driven piston and the piston rod; the design of this transmission device is not only structurally compact but also has stable movement, further improving the pressure - building efficiency of the air - compression chamber and the performance of the circuit breaker.

[0017] Preferably, in the present invention, a special - shaped connecting rod is used as part of the transmission device. Through the provided arc - shaped structure, the relative movement displacement and speed of the driving piston and the driven piston can be controlled, so that the movement characteristics of the circuit - breaker piston can be autonomously controlled by adjusting the shape of the special - shaped connecting rod.

[0018] Preferably, in the present invention, the transmission device composed of components such as a sleeve, a guide groove, and a rotating pin realizes the helical - motion transmission between the piston rod and the driven piston; this design not only simplifies the transmission structure but also makes the movement of the driven piston smoother and more controllable, further improving the pressure - building ability and stability of the circuit breaker.

[0019] Preferably, in the present invention, through the meshing connection of a rack and a gear, the precise transmission between the piston rod and the driven piston is realized; this design is not only simple in structure, high in transmission efficiency, but also easy to realize automatic control, improving the intelligent level and operation efficiency of the circuit breaker.

[0020] Further preferably, in the present invention, ensuring that the first rack, the second rack are parallel to the piston rod is conducive to maintaining the stability and accuracy of the transmission, avoiding transmission errors and mechanical wear caused by angular deviation, thereby extending the service life of the circuit breaker.

[0021] Preferably, in the present invention, a guide sleeve is sleeved on the outer wall of the driven piston, which can effectively reduce the friction and wear of the driven piston during movement, improving its movement smoothness and durability; at the same time, the guide sleeve can also play a guiding and sealing role, ensuring that the driven piston moves along a predetermined trajectory and the good sealing performance of the air - compression chamber.

[0022] Preferably, in the present invention, the driven piston is sleeved between the outer wall of the piston rod and the inner wall of the air - compression cylinder, making full use of the space structure and making the overall structure of the circuit breaker more compact; this design not only reduces material consumption and manufacturing cost but also improves the mechanical strength and stability of the circuit breaker.

[0023] The present invention also provides a working method for a double - acting compressed - air piston circuit breaker. Based on the above - mentioned double - acting compressed - air piston circuit breaker, this method utilizes the fact that while the piston rod drives the driving piston to move, the reverse movement of the driven piston is realized through the transmission device, enabling the driving piston, the driven piston, and the inner wall of the air - compression cylinder to cooperate together to efficiently build up the pressure in the air - compression chamber. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1Structural schematic diagram of a double-acting pneumatic piston circuit breaker provided by the present invention; Figure 2 Working principle diagram of a double-acting pneumatic piston circuit breaker provided by the present invention; Figure 3 Structural schematic diagram of a double-acting pneumatic piston circuit breaker provided in Embodiment 1 of the present invention; Figure 4 Working principle diagram of a double-acting pneumatic piston circuit breaker provided in Embodiment 1 of the present invention; Figure 5 Structural schematic diagram of a double-acting pneumatic piston circuit breaker provided in Embodiment 2 of the present invention; Figure 6 Structural schematic diagram of a double-acting pneumatic piston circuit breaker provided in Embodiment 3 of the present invention; Figure 7 Structural schematic diagram of a double-acting pneumatic piston circuit breaker provided in Embodiment 4 of the present invention.

[0024] Reference numerals: 1, active piston; 2, driven piston; 3, pneumatic cylinder; 4, piston rod; 5, connecting rod; 6, first rotating pin; 7, special-shaped connecting rod; 8, sleeve; 9, second rotating pin; 10, first rack; 11, second rack; 12, gear; 21, guide sleeve; 22, guide rod; 41, fixed block; 42, first guide groove; 51, first shaft pin; 52, second shaft pin; 81, second guide groove. Detailed implementation manners

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer and more understandable, the following specific embodiments are used to further elaborate on the present invention in detail. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0028] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the invention product is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0031] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] Embodiment 1 This embodiment provides a double-acting pneumatic piston circuit breaker. This circuit breaker includes an active piston and a driven piston. Through a transmission arrangement, the reverse movement of the active piston and the driven piston is realized, so that under the condition that the opening speed and the mechanism stroke are certain, the pressure in the pressure cylinder is increased by 2 times (the breaking performance is increased by 2 times); when the opening speed is certain and the mechanism stroke is reduced by 1 / 2, the same pressure building effect as that of a conventional pressure cylinder is achieved (miniaturization); when the mechanism stroke is certain and the opening speed is reduced by 1 / 2, the same pressure building effect as that of a conventional pressure cylinder is achieved (high reliability), and the goals of high reliability, intensification, and high breaking performance of the circuit breaker are realized.

[0033] To facilitate the understanding of the technical solution provided by the present invention, the following technical terms are now explained: Circuit breaker: A mechanical switching device that can close, carry, and interrupt the current under normal circuit conditions; carry a specified overcurrent within a specified time, and can close and interrupt the current under abnormal circuit conditions (such as various short - circuit conditions).

[0034] As Figure 1 As shown, this embodiment provides a double - acting pneumatic piston circuit breaker. Based on the conventional single - acting pneumatic piston circuit breaker, a movable pneumatic piston is added. By setting a transmission device between the newly added pneumatic piston and the piston rod, the reverse movement of the two pneumatic pistons is realized. The structure is simple and reliable, meeting the requirements for improving the breaking capacity of the circuit breaker. The specific structure includes: The circuit breaker body, where the circuit breaker body includes a moving side and a static side; An active piston 1 and a driven piston 2 are arranged on the circuit breaker body; In this embodiment, the active piston 1, the driven piston 2 and the inner wall of the pneumatic cylinder 3 enclose a pneumatic chamber; The active piston 1 is connected to the piston rod 4; The driven piston 2 is connected to the piston rod 4 through a transmission device; The piston rod 4 can drive the reverse movement between the active piston 1 and the driven piston 2.

[0035] As Figure 2 shown, when this circuit breaker works, the piston rod 4 drives the active piston 1 to move, and at the same time drives the driven piston 2 to move in the reverse direction through the transmission device, so that the active piston 1, the driven piston 2 and the inner wall of the pneumatic cylinder 3 jointly build the pressure of the pneumatic chamber.

[0036] Thus, using this circuit breaker avoids the way in traditional circuit breakers of simply relying on increasing the relative movement speed between the piston and the pneumatic cylinder, or increasing the volume of the pneumatic chamber, or increasing the movement stroke to build pressure. Thereby, the increase in operating work is reduced, and the mechanical reliability of the circuit breaker and the mechanism is improved; at the same time, through the reverse movement of the active piston and the driven piston, the volume change of the pneumatic chamber is more effectively utilized to build pressure, without relying too much on the increase in speed. Therefore, it can achieve a higher breaking capacity and pressure - building effect without significantly increasing the operating work, effectively solving the problems such as increased cost, increased vibration, and reduced stability in the prior art, and significantly optimizing the performance of the circuit breaker.

[0037] As Figure 3 and Figure 4As shown in the figure, in this embodiment, the transmission device includes core components such as a guide rod 22, a fixed block 41, a connecting rod 5, two shaft pins (a first shaft pin 51 and a second shaft pin 52), and a first rotating pin 6. The specific connection relationships are as follows: The guide rod 22 is firmly connected to the driven piston 2 and is parallel to the piston rod 4. The connecting rod 5 is movably connected to the fixed block 41 and its second slot through the first shaft pin 51, and at the same time, is movably connected to the guide slot of the guide rod 22 and its first slot through the second shaft pin 52; among them, the fixed block 41 is fixed to the outer wall of the piston rod 4. In addition, the connecting rod 5 can rotate around the first rotating pin 6 fixed to the inner wall of the pressure cylinder 3, so as to realize the reverse movement with the driven piston 2 driven by the piston rod 4.

[0038] Embodiment 2 This embodiment provides another double-acting pneumatic piston circuit breaker, whose overall structure is the same as that of Embodiment 1. The difference is that the transmission device is further improved and optimized on the basis of Embodiment 1, and a special-shaped connecting rod 7 is used to replace the ordinary connecting rod 5.

[0039] The guide rod 22 is fixedly connected to the driven piston 2 and is arranged parallel to the piston rod 4; the first shaft pin 51 is simultaneously movably inserted into the first slot of the special-shaped connecting rod 7 and the fixed block 41; the second shaft pin 52 is simultaneously movably inserted into the second slot of the special-shaped connecting rod 7 and the guide slot of the guide rod 22; the fixed block 41 is fixedly connected to the outer wall of the piston rod 4; the first rotating pin 6 is fixed to the inner wall of the pressure cylinder 3 and is movably inserted into the special-shaped connecting rod 7; the special-shaped connecting rod 7 can rotate along the first rotating pin 6 driven by the piston rod 4.

[0040] Embodiment 3 As Figure 6 shown, this embodiment provides another double-acting pneumatic piston circuit breaker, whose overall structure is the same as that of Embodiment 1. The difference is that the transmission device mainly includes components such as a sleeve 8, a first guide slot 42, a second guide slot 81, and a second rotating pin 9. One end of the sleeve 8 is connected to the driven piston 2 and the whole is sleeved outside the piston rod 4. The piston rod 4 and the sleeve 8 are respectively provided with first guide slots 42 and second guide slots 81 in opposite directions, and both the first guide slot 42 and the second guide slot 81 are spiral structures; the second rotating pin 9 is simultaneously inserted into the two guide slots. When the piston rod 4 moves, the movement of the second rotating pin 9 in the first guide slot 42 can drive the sleeve 8 and the second guide slot 81 to move in the opposite direction, so as to realize the reverse movement of the driven piston 2 and the piston rod 4.

[0041] The specific working principle is as follows: When the piston rod 4 moves to one side, it drives the second rotating pin 9 to slide in the first guiding groove 42. Since the first guiding groove 42 is inserted into the second guiding groove 81 at the same time, it also drives the second guiding groove 81 to move in the opposite direction of the piston rod 4, thereby driving the sleeve 8 to move in the opposite direction through the second guiding groove 81; finally, the driven piston 2 and the piston rod 4 move in the opposite direction at the same time. Among them, the movement track of the second rotating pin 9 is as follows: before moving, the piston rod 4 and the sleeve 8 are in a contracted state along the axial direction and are sleeved together; the second rotating pin 9 is at one end of the first guiding groove 42 and the second guiding groove 81; during the movement of the second rotating pin 9, the second rotating pin 9 slides towards the other end of the first guiding groove 42 and the second guiding groove 81. During the movement, the first guiding groove 42 and the second guiding groove 81 present a spiral cross shape in space; finally, the second rotating pin 9 moves to the other end of the first guiding groove 42 and the second guiding groove 81, realizing the axial expansion between the piston rod 4 and the sleeve 8; that is, realizing the reverse movement of the driven piston 2 and the piston rod 4.

[0042] Embodiment 4 As Figure 7 shown, this embodiment provides another double-acting pneumatic piston circuit breaker. The overall structure is the same as that of Embodiment 1. The difference is that the transmission device adopts a rack and gear transmission method, specifically including components such as a first rack 10, a second rack 11 and a gear 12. The first rack 10 is fixedly connected to the driven piston 2, the second rack 11 is fixedly connected to the outer wall of the piston rod 4, and the gear 12 is fixedly connected to the inner wall of the pressure cylinder 3. The first rack 10 and the second rack 11 are meshed and connected through the gear 12, thereby realizing the precise transmission between the piston rod 4 and the driven piston 2.

[0043] In this embodiment, the first rack 10, the second rack 11 and the piston rod 4 are all kept parallel to improve the stability and accuracy of the transmission.

[0044] For Embodiments 1-4, a guiding sleeve 21 is sleeved on the outer wall of the driven piston 2 to reduce friction and wear and maintain the airtightness of the pressure cylinder; the driven piston 2 is sleeved between the outer wall of the piston rod 4 and the inner wall of the pressure cylinder 3.

[0045] Moreover, in the embodiment, the driven piston 2 and the piston rod 4 can be connected by at least two sets of transmission devices to ensure the stability and reliability of the transmission. When there are two sets of transmission devices, they are symmetrically arranged; when the number of transmission devices is greater than two sets, they are evenly arranged along the piston rod 4, so that the circuit breaker can still maintain a good operating state when subjected to a large load, thereby improving its overall performance and safety. It should be noted that the transmission device of the spiral structure provided in Example 3 only requires one set to achieve stable and reliable transmission; the transmission devices provided in other embodiments can all adopt at least two sets, which solves the problem of unreliable transmission caused by the possible lateral force generated by the use of a single set of transmission devices.

[0046] It should be noted that circuit breakers are divided into single-acting circuit breakers and double-acting circuit breakers; here, a conventional double-acting circuit breaker refers to a structure in which the moving and static side contacts of the circuit breaker move in opposite directions at the same time; that is, the transmission device provided in the above embodiment and the piston structure based on the transmission device can be applied to single-acting circuit breakers as well as double-acting circuit breakers.

[0047] In summary, the present invention provides a double-acting pneumatic piston circuit breaker, which adds a movable pneumatic piston to a conventional single pneumatic piston circuit breaker; by providing a transmission device between the newly added pneumatic piston and the piston rod, the reverse movement of the two pneumatic pistons is realized, and the following effects can be achieved: In order to improve the breaking performance of the circuit breaker, under the conditions of certain opening speed and mechanism stroke, the use of this circuit breaker can increase the pressure of the air cylinder by 2 times; In view of the miniaturized design of the circuit breaker, under the condition that the opening speed is constant and the mechanism stroke is reduced to 1 / 2, the use of this circuit breaker can achieve the same pressure building effect as the conventional pressure cylinder; In terms of high reliability, under the condition that the mechanism stroke is constant and the opening speed is reduced to 1 / 2, the use of this circuit breaker can achieve the same pressure building effect as the conventional pressure cylinder; It can be seen that the present invention increases a driven air-compressing piston to drive the movement of the driven piston during the movement of the active piston, thereby achieving the situation that the pressure of the air-compressing cylinder can be increased to twice the original pressure without increasing the opening speed of the circuit breaker and the stroke of the moving contact of the circuit breaker, thereby improving the breaking performance of the circuit breaker; it is also possible to achieve the same pressure building effect as the original air-compressing cylinder of the circuit breaker by reducing the stroke of the moving contact of the circuit breaker without increasing the opening speed of the circuit breaker, thereby realizing the miniaturization of the product and reducing the occupied space and cost of the product; it is also possible to achieve the same pressure building effect as the original air-compressing cylinder of the circuit breaker by reducing the opening speed of the circuit breaker without changing the stroke of the moving contact of the circuit breaker, thereby reducing the operating work of the circuit breaker and improving the reliability and stability of the product.

[0048] The above embodiments are merely one of the implementation manners capable of implementing the technical solution of the present invention. The scope of protection required by the present invention is not limited solely by this embodiment, but also includes any changes, substitutions, and other implementation manners that are readily conceivable by any person skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A double-acting pneumatic piston circuit breaker, characterized in that: including a circuit breaker body; An active piston (1) and a driven piston (2) are provided on the circuit breaker body; The active piston (1), the driven piston (2) and the inner wall of the air pressure cylinder (3) together form an air pressure chamber; The active piston (1) is connected to the piston rod (4); The driven piston (2) is connected to the piston rod (4) via a transmission device; The piston rod (4) can drive the active piston (1) and the driven piston (2) to achieve reverse movement.

2. The double-acting pneumatic piston circuit breaker according to claim 1, characterized in that: The transmission device comprises a guide rod (22), a fixed block (41), a connecting rod (5), a first shaft pin (51), a second shaft pin (52) and a first rotating pin (6); The guide rod (22) is fixedly connected to the driven piston (2) and is arranged parallel to the piston rod (4); The first axle pin (51) is movably inserted into the first strip hole of the connecting rod (5) and the fixing block (41) at the same time; The second axle pin (52) is movably inserted into the second strip hole of the connecting rod (5) and the guide groove of the guide rod (22) at the same time; The fixing block (41) is fixedly connected to the outer wall of the piston rod (4); The first rotating pin (6) is fixed on the inner wall of the air cylinder (3) and is movably inserted on the connecting rod (5); the connecting rod (5) is able to rotate along the first rotating pin (6) when driven by the piston rod (4).

3. The double-acting pneumatic piston circuit breaker according to claim 1, characterized in that: The transmission device comprises a guide rod (22), a fixing block (41), a special-shaped connecting rod (7), a first shaft pin (51), a second shaft pin (52) and a first rotating pin (6); The guide rod (22) is fixedly connected to the driven piston (2) and is arranged parallel to the piston rod (4); The first axle pin (51) is movably inserted into the first strip hole of the special-shaped connecting rod (7) and the fixing block (41) at the same time; The second axle pin (52) is movably inserted into the second strip hole of the special-shaped connecting rod (7) and the guide groove of the guide rod (22) at the same time; The fixing block (41) is fixedly connected to the outer wall of the piston rod (4); The first rotating pin (6) is fixed on the inner wall of the air cylinder (3) and is movably inserted on the special-shaped connecting rod (7); the special-shaped connecting rod (7) is able to rotate along the first rotating pin (6) when driven by the piston rod (4).

4. The double-acting pneumatic piston circuit breaker according to claim 1, characterized in that: The transmission device comprises a sleeve (8), a first guide groove (42), a second guide groove (81) and a second rotating pin (9); One end of the sleeve (8) is connected to the driven piston (2), and the sleeve (8) is entirely sleeved on the outside of the piston rod (4); The first guide groove (42) is formed in a spiral direction along the rod wall of the piston rod (4); The second guide groove (81) is formed in a spiral direction along the wall of the sleeve (8); The first guide groove (42) and the second guide groove (81) are in opposite directions; The second rotating pin (9) is inserted into the first guide groove (42) and the second guide groove (81) at the same time; The piston rod (4) can move in the first guide groove (42) via the second rotating pin (9) to drive the second guide groove (81) to move in the opposite direction.

5. The double-acting pneumatic piston circuit breaker according to claim 1, characterized in that: The transmission device comprises a first rack (10), a second rack (11) and a gear (12); The first rack (10) is fixedly connected to the driven piston (2); The second rack (11) is fixedly connected to the outer wall of the piston rod (4); The gear (12) is fixedly connected to the inner wall of the air pressure cylinder (3); The first rack (10) and the second rack (11) are meshingly connected via the gear (12).

6. The double-acting pneumatic piston circuit breaker according to claim 5, characterized in that: The first rack (10), the second rack (11) and the piston rod (4) are all arranged in parallel.

7. The double-acting pneumatic piston circuit breaker according to any one of claims 1 to 6, characterized in that: The outer wall of the driven piston (2) is provided with a guide sleeve (21).

8. The double-acting pneumatic piston circuit breaker according to any one of claims 1 to 7, characterized in that: The driven piston (2) is sleeved between the outer wall of the piston rod (4) and the inner wall of the air pressure cylinder (3).

9. The double-acting pneumatic piston circuit breaker according to claim 1, characterized in that: The driven piston (2) is connected to the piston rod (4) via at least two sets of transmission devices; When there are two transmission devices, the two transmission devices are symmetrically arranged; When the number of transmission devices is greater than 2, the multiple transmission devices are evenly arranged along the piston rod (4).

10. A method for operating a double-acting pneumatic piston circuit breaker, characterized in that: The double-acting pneumatic piston circuit breaker according to any one of claims 1 to 9 comprises: The piston rod (4) drives the active piston (1) to move, and at the same time drives the driven piston (2) to move in the opposite direction through the transmission device, so that the active piston (1), the driven piston (2) and the inner wall of the pressure cylinder (3) jointly establish the pressure of the pressure chamber.

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