Circuit breaker structure

Abstract

The invention discloses a circuit breaker structure, which belongs to the technical field of circuit breakers, and comprises a circuit breaker body consisting of a static side base, a movable side base and an air cylinder, a transmission piece connected with the air pressing valve is inserted into the air pressing cylinder; according to the circuit breaker structure, the air pressure valve and the movable main contact are connected into a whole, and by adopting the design, the space occupation in the diameter direction of the circuit breaker can be reduced, namely the radial size of the circuit breaker is reduced, the miniaturization and compact design of the circuit breaker can be realized, and the mechanical reliability is improved; meanwhile, the operation work of the mechanism can be reduced, so that a transmission system of the whole circuit breaker structure is simplified; the circuit breaker structure is simple in design principle and convenient to implement, operate and maintain, the possibility of flexible deployment and efficient application of the circuit breaker in a modern power system can be improved by adopting the structure, and the circuit breaker structure has good popularization and application value.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a circuit breaker structure. Background Art

[0002] Circuit breaker is an important power equipment, which can play the role of closing, carrying and breaking current in the circuit to ensure the safe and stable operation of the power system; the circuit breaker can close, carry and break the current under normal circuit conditions, and can close, carry and break the current under abnormal circuit conditions (such as short circuit, overload, undervoltage, etc.) within a specified time. Its function is equivalent to the combination of fuse switch and over-underheating relay. It can automatically cut off the circuit when a circuit fault occurs to prevent the accident from expanding and ensure the safety of equipment and personnel. The importance of the internal structure design of the circuit breaker lies in optimizing electrical performance, improving operational reliability, enhancing safety protection capabilities, and promoting the miniaturization and integration of equipment to meet the urgent needs of modern power systems for efficient, safe and compact power control equipment. Through a carefully designed internal structure, the circuit breaker can more effectively manage current, quickly cut off the faulty circuit, while reducing energy loss and maintenance costs, providing a solid guarantee for the stable operation of the power system.

[0003] Within the existing technical framework, with the development of the times, ultra-large capacity circuit breakers face a significant design challenge: the moving main contact of the circuit breaker is arranged independently of the pressure cylinder and is driven separately by a complex transmission system. This design is not only limited by the direct relationship between the cross-sectional area of ​​the moving contact and the current carrying capacity, but also because of the volume of the transmission system and the connection structure between the transmission system and the moving contact, which occupies part of the space in the diameter direction of the circuit breaker; this layout causes the circuit breaker to encounter bottlenecks in the pursuit of miniaturization and compact design, especially the diameter size is difficult to effectively reduce, limiting the possibility of flexible deployment and efficient application of circuit breakers in modern power systems.

[0004] It can be seen that in the existing circuit breaker structure, the moving parts of the transmission system and the connection structure with the moving contact need to occupy the space in the diameter direction of the circuit breaker, resulting in the inability to meet the miniaturization design requirements of the circuit breaker. Summary of the invention

[0005] The present invention provides a circuit breaker structure to solve the technical problem that in the existing circuit breaker structure, the moving parts of the transmission system and the connection structure with the moving contact need to occupy the space in the diameter direction of the circuit breaker, resulting in the failure to meet the miniaturization design requirements of the circuit breaker.

[0006] In order to achieve the above object, the present invention adopts the following technical contents:

[0007] A circuit breaker structure includes a circuit breaker body;

[0008] The circuit breaker body comprises a static side base, a dynamic side base and a pressure cylinder;

[0009] A static side main contact is fixed on the static side base;

[0010] A conduction unit is provided on the moving side base;

[0011] A transmission member is inserted into the air compression cylinder, and the transmission member is connected to the air compression valve of the air compression cylinder;

[0012] A moving main contact capable of sliding between the conduction unit and the static side main contact is fixed on the air compression valve;

[0013] The transmission member can drive the moving main contact to move synchronously through the compressed air valve to achieve disconnection or conduction between the conduction unit and the stationary side main contact.

[0014] Furthermore, the conduction unit includes a moving side static main contact fixed on the moving side base; the moving main contact is always in contact with the moving side static main contact; when the moving main contact and the static side main contact are in contact, the moving side static main contact and the static side main contact are conductive; when the moving main contact is separated from the static side main contact, the moving side static main contact and the static side main contact are disconnected.

[0015] Furthermore, an insulating pad is provided between the moving main contact and the air compression valve for isolating the moving main contact from the air compression valve in terms of potential.

[0016] Furthermore, the moving main contact is fixed to the compressed air valve by means of screws; the screws sequentially pass through a gasket, an insulating sleeve, the compressed air valve, the insulating pad and the moving main contact, and are threadedly connected to the moving main contact.

[0017] Furthermore, the conduction unit includes a strap; the outer side of the strap is connected to the inner wall of the compressed air cylinder, and the inner side is fixed to the outer wall of the compressed air valve; the moving main contact is electrically connected to the compressed air valve.

[0018] Furthermore, the air cylinder is provided with an insulating cylinder support for supporting the insulating cylinder; the insulating cylinder support is provided with a guide structure; the guide structure is located at the bottom of the inner wall of the moving main contact, and is used to provide guidance and support force for the moving main contact.

[0019] Furthermore, the guide structure includes pressure plates arranged on both sides and an insulating component connected between the pressure plates on both sides;

[0020] The pressing plate is fixed to the insulating tube support by crimping;

[0021] The insulating assembly includes a plurality of rollers;

[0022] A guide plate is provided at the bottom of the inner wall of the moving main contact;

[0023] The guide plate and the roller are slidably matched to guide the moving main contact.

[0024] Furthermore, the insulating assembly also includes an insulating bottom plate; an insulating groove is opened on the insulating bottom plate, and limit blocks are respectively arranged on both sides of the insulating groove; a central axis is fixed between the limit blocks on both sides; and a plurality of rollers are sleeved on the central axis.

[0025] Furthermore, the insulating groove adopts an arc groove structure, and the arc cross-sectional area of ​​the insulating groove is larger than the semicircle area; wherein the semicircle has the center of the central axis as the center and the outer diameter of the limit block as the radius.

[0026] Furthermore, the length of the guide plate is greater than the axial movement length of the moving main contact.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention provides a circuit breaker structure, which includes a circuit breaker body consisting of a static side base, a dynamic side base and a compressed air cylinder; a transmission member connected to a compressed air valve is inserted on the compressed air cylinder; the circuit breaker structure connects the compressed air valve and the dynamic main contact together. Such a design can not only reduce the space occupied in the diameter direction of the circuit breaker, that is, reduce the radial size of the circuit breaker, help to achieve miniaturization and compact design of the circuit breaker, and improve mechanical reliability; at the same time, it can also reduce the operating work of the mechanism, so that the transmission system of the entire circuit breaker structure is simplified; the design principle of the circuit breaker structure is simple, and it is easy to implement and maintain. The use of this structure can improve the possibility of flexible deployment and efficient application of circuit breakers in modern power systems, and has good promotion and application value.

[0029] Preferably, in the present invention, a moving side static main contact is arranged on the moving side base, and the moving main contact is always in contact with the moving side static main contact; when the moving main contact is in contact with the static side main contact, the circuit is turned on; when the moving main contact is separated from the static side main contact, the circuit is turned off; at the same time, a break insulator is also arranged between the moving side base and the static side base, so that the insulation performance and conduction performance of the circuit breaker are guaranteed.

[0030] Further preferably, in the present invention, an insulating pad is provided between the moving main contact and the air compression valve to achieve potential isolation between the two, which helps to prevent current from flowing through the air compression cylinder, causing the air compression cylinder to heat up, causing the guide ring in the air compression cylinder to heat up and deform, and affecting the movement of the air compression valve and the moving main contact.

[0031] Preferably, in the present invention, the moving main contact is fixed to the air compression valve by screws, and the screws pass through the gasket, insulating sleeve, insulating pad and other components in sequence. This not only simplifies the installation process, but also improves the connection strength and stability between the moving main contact and the air compression valve, which helps to ensure the overall performance and reliability of the circuit breaker.

[0032] Preferably, in the present invention, another conduction unit is provided, which is connected to the air cylinder and the air valve through a strap, and the moving main contact is electrically connected to the air valve; this design further simplifies the internal structure of the circuit breaker, improves the overall compactness and reliability, and also helps to improve the conductivity of the circuit breaker.

[0033] Preferably, in the present invention, an insulating cylinder support and a guide structure are provided on the air cylinder to provide guidance and support for the moving main contact; this helps to ensure the stability and accuracy of the moving main contact during movement, and improves the operating performance and reliability of the circuit breaker.

[0034] Further preferably, in the present invention, the guide structure adopts a combination design of a pressure plate and an insulating component, wherein the insulating component includes a roller that slides with the guide plate at the bottom of the inner wall of the moving main contact; this design reduces the friction and wear of the moving main contact during movement, thereby improving its service life and reliability.

[0035] Further preferably, in the present invention, the insulating assembly also includes an insulating base plate, a limit block, a center shaft and a roller, and an insulating groove with an arc groove structure. This design not only enhances the insulation performance, but also improves the stability and flexibility of the roller in the insulating groove, further improving the reliability and service life of the guide structure; in addition, the insulating base plate can also effectively isolate the potential of the moving main contact and the insulating tube support, further improving the electrical performance.

[0036] Preferably, in the present invention, the insulating groove adopts an arc groove structure, and the arc cross-sectional area is larger than the semicircular area. Such a design can prevent the roller from escaping from the insulating component, ensuring that the guide structure plays a good and reliable guiding role.

[0037] Preferably, in the present invention, the length of the guide plate is greater than the axial movement length of the moving main contact; this design ensures that the moving main contact is always supported and guided by the guide plate during movement, thereby improving the stability and accuracy of its movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of a circuit breaker structure provided by an embodiment of the present invention;

[0039] Figure 2 A schematic structural diagram of a moving main contact of a circuit breaker structure provided by an embodiment of the present invention connected to a gas pressure valve;

[0040] Figure 3 A structural schematic diagram of another circuit breaker structure provided by an embodiment of the present invention, wherein a moving main contact is connected to a gas pressure valve;

[0041] Figure 4 A schematic diagram of assembling a moving main contact and an insulating cylinder support of a circuit breaker structure provided by an embodiment of the present invention;

[0042] Figure 5 A schematic diagram of the assembly of a guide structure of a circuit breaker structure provided by an embodiment of the present invention;

[0043] Figure 6 A schematic structural diagram of a moving main contact of a circuit breaker structure provided by an embodiment of the present invention;

[0044] Figure 7 A schematic structural diagram of a guide structure of a circuit breaker structure provided by an embodiment of the present invention;

[0045] Figure 8 A schematic structural diagram of an insulating component of a guide structure of a circuit breaker structure provided by an embodiment of the present invention.

[0046] Reference numerals:

[0047] Static side base-1, static side main contact-2, moving main contact-3, guide structure-4, moving side static main contact-5, insulating sleeve-6, gasket-7, screw-8, break insulator-9, moving side base-10, pull rod-11, gas inside the pressure cylinder-12, pressure cylinder-13, pressure valve-14, guide ring-15, insulation pad-16, insulation tube support-17, insulation tube-18, strap-20;

[0048] Slot-3-1, guide plate-3-2;

[0049] Tank-17-1;

[0050] Pressing plate-41, insulating component-42;

[0051] Insulating base plate-42-1, limiting block-42-2, roller-42-3, center axis-42-4. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. 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.

[0053] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0056] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0057] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0058] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Example 1

[0060] Combined with what is mentioned in the background technology, currently, ultra-large capacity circuit breakers face a significant design challenge: the moving main contact of the circuit breaker is arranged independently of the pressure cylinder and driven separately by a complex transmission system. This design is not only limited by the direct correlation between the cross-sectional area of ​​the moving contact and the current carrying capacity, but also occupies part of the space in the diameter direction of the circuit breaker due to the volume of the transmission system and the connection structure between it and the moving contact; this layout has caused the circuit breaker to encounter bottlenecks in the pursuit of miniaturization and compact design, especially the size in the diameter direction is difficult to effectively reduce, limiting the possibility of flexible deployment and efficient application of circuit breakers in modern power systems. More specifically, in the traditional circuit breaker design, due to the small diameter of the conductor, the moving main contact can move with the pressure cylinder, and the mechanism operating power still meets the requirements under high-speed conditions; but for large-capacity circuit breakers, if this method is adopted, the mechanism that requires a larger output power may not even meet the requirements of the existing mechanism.

[0061] In order to solve the above problems, the present invention provides a circuit breaker structure. The design concept of the circuit breaker structure is that since the mass of the air compression valve is much smaller than the mass of the entire air compression cylinder, the moving main contact is only fixed on the air compression valve, which can not only reduce the radial size of the circuit breaker, but also reduce the operating work of the mechanism.

[0062] In order to facilitate understanding of the technical solution provided by this embodiment, the technical terms in this field are explained as follows:

[0063] Moving main contact: The moving main contact is a contact installed in the circuit breaker that can move relative to each other to connect and disconnect the circuit. It is usually installed on the transmission component and works with the static contact.

[0064] Compressed air cylinder: The compressed air cylinder is a structure used in circuit breakers to enhance arc extinguishing capability. In the initial stage of circuit breaker opening operation, the movement of the compressed air valve compresses the gas in the compressed air cylinder into the thermal expansion chamber, increasing the air pressure in the expansion chamber and accelerating arc extinguishing when the arc is burning.

[0065] Air compression valve: The air compression valve is the moving part on the air compression cylinder. Through the movement of the air compression valve, the gas in the air compression cylinder is compressed into the thermal expansion chamber.

[0066] like Figure 1 As shown, this embodiment provides a circuit breaker structure, which is specifically composed of a static side base 1, a static side main contact 2, a moving main contact 3, a guide structure 4, a moving side static main contact 5, an insulating sleeve 6, a gasket 7, a screw 8, a break insulator 9, a moving side base 10, a pull rod 11 (transmission part), gas inside the compressed air cylinder 12, a compressed air cylinder 13, a compressed air valve 14, a guide ring 15, an insulating pad 16, an insulating cylinder support 17, and an insulating cylinder 18.

[0067] In this embodiment, a large current circuit breaker structure is taken as an example to describe the specific structure of the present technical solution, but it is not limited to this embodiment.

[0068] Among them, there is a break insulator 9 between the static side base 1 and the dynamic side base 10, a static side main contact 2 is fixed on the static side base 1, a dynamic side static main contact 5 is fixed on the dynamic side base 10, and the dynamic main contact 3 slides between the static side main contact 2 and the dynamic side static main contact 5; the dynamic main contact 3 is fixed on the compressed air valve 14. The outer ring and the inner ring of the compressed air valve are both provided with a guide ring 15. The pull rod 11 passes through the inside of the compressed air cylinder and is fixed on the compressed air valve 14, and the pull rod 11 drives the compressed air valve 14 and the dynamic main contact 3 to move together.

[0069] like Figure 2 As shown, in this embodiment, the air compression valve 14 and the moving main contact 3 are electrically isolated by an insulating pad 16. An insulating pad 16 is added between the moving main contact 3 and the air compression valve 14 to keep the two electrically isolated and prevent the current from flowing through the air compression cylinder 13; the current only flows between the moving and static main contacts. The screw 8 passes through the gasket 7, the insulating sleeve 6, the air compression valve 14, the insulating pad 16 and the moving main contact 3 in sequence. The insulating sleeve 6 has a larger outer diameter on the side close to the gasket 7 and abuts against one side of the air compression valve 14. The other side of the insulating sleeve 6 extends into the interior of the air compression valve 14 to keep the screw 8 insulated from the air compression valve 14. There is a threaded hole on the moving main contact 3, and the screw 8 is screwed into the threaded hole.

[0070] In this embodiment, the guiding problem is also specially considered, that is, since the guiding of the moving main contact during movement is on the compressed air valve, which is far away from the end of the moving contact, the guiding effect on the end of the moving contact is weak. During the closing process, especially in the circuit breaker with frequent operation, the moving and static contacts may collide, causing the contacts to deform or be damaged, and at the same time causing a huge reaction force on the mechanism, causing the circuit breaker and the mechanism to fail.

[0071] Therefore, in order to improve the accuracy of the moving position of the moving main contact, a guide structure is installed between the inner side of the moving main contact and the outer side of the insulating cylinder support. The significance of this design is that: the inner side of the moving main contact can play a certain supporting role for the moving main contact, and at the same time, the static insulating cylinder support is used as a fixing device to reduce vibration and shaking during operation; the characteristics and advantages of existing components are effectively utilized, their functions are expanded, and the problems in the current structure are solved; and there is no need to expand the radial distance inside the circuit breaker.

[0072] like Figure 4 As shown, in order to improve the stability and accuracy of the movement of the moving main contact 3, a guide structure 4 is installed between the inner side of the moving main contact 3 and the outer side of the insulating tube support 17.

[0073] like Figure 5As shown, a groove 17-1 is provided on the outer side of the insulating cylinder support 17, and the guide structure 4 is embedded in the insulating cylinder support 17 to limit the movement of the guide along the contact movement direction. The guide structure 4 is arranged at several positions on the insulating cylinder support 17 to support and limit the moving main contact 3, thereby reducing deviation and vibration during movement.

[0074] like Figure 6 As shown, a slotted hole 3-1 is opened on the inner side of the moving main contact 3, and a guide plate 3-2 is embedded in the moving main contact 3. The guide plate 3-2 is made of a highly wear-resistant material. The length of the guide plate 3-2 is greater than the travel of the moving main contact 3. The roller 42-3 in the guide structure 4 rolls on the guide plate 3-2 without getting stuck. The distribution of the guide plate 3-2 on the moving main contact 3 corresponds one-to-one to the position of the guide structure 4 on the insulating tube support 17.

[0075] like Figure 7 As shown, the guide structure 4 includes an insulating component 42 located in the middle, and the insulating component 42 adopts a high-strength and high-temperature resistant insulating component. A roller 42-3 is embedded in the middle of the insulating component 42, and the roller 42-3 is preferably a metal roller; the two sides of the insulating component 42 are fixed to the insulating cylinder support 17 by pressing plates 41. The insulating bottom plate 42-1 is used in the middle to keep the moving main contact 3 and the insulating cylinder support 17 in electrical potential isolation, so as to prevent the current from passing through the insulating cylinder support 17, thereby affecting the performance of the insulating cylinder.

[0076] like Figure 8 As shown, the roller 42-3 embedded in the middle of the insulating component 42 can roll on the central axis 42-4, and the central axis 42-4 inserted at both ends of the roller 42-3 is fixed on the limit block 42-2 by bonding and interference fit; the limit block 42-2 is located in the insulating groove of the insulating base plate 42-1, wherein the limit block 42-2 adopts a cylindrical structure with a cut surface on the top, and the height of the top cut surface is lower than the height of the roller 42-3; the insulating groove adopts an arc groove design, and its cross-sectional area is larger than a semicircle, which can better prevent the roller 42-3 from jumping out of the insulating component 42.

[0077] It can be seen that the guide structure 4 is used for the smooth and precise movement of the moving main contact 3. Compared with the existing guide structure, which is usually a guide ring structure, arranged in a ring surface, has a large contact area with the moving main contact and a large friction force; and the traditional guide structure is easily affected by thermal expansion and contraction, especially for the moving main contact with a large mass and high-speed movement, which may cause a jamming phenomenon. Therefore, the guide structure in this embodiment adopts a roller structure and is arranged in a point-distributed manner, so that the friction force is small, which greatly reduces the possibility of jamming.

[0078] This embodiment provides a circuit breaker structure, which has the following advantages:

[0079] The circuit breaker structure fixes the moving main contact on the compressed air valve, reducing the diameter of the large-capacity circuit breaker; a guide structure is installed between the inner side of the moving main contact and the outer side of the insulating tube support to ensure the stability and accuracy of the high-speed movement of the moving main contact.

[0080] Example 2

[0081] like Figure 3 As shown, this embodiment also provides another circuit breaker structure, and the basic structure is the same as that of embodiment 1. The purpose of designing this embodiment is to simplify the traditional system to a greater extent, reduce the internal space structure, and take into account good and reliable electrical performance.

[0082] This embodiment provides another circuit breaker structure, which specifically includes:

[0083] Specific as Figure 3 As shown, a fixed electrical contact is adopted between the air pressure valve 14 and the moving main contact 3; the air pressure valve 14 and the air pressure cylinder 13 are connected by a strap 20. In the circuit breaker structure, the original moving side static main contact is cancelled, and the current flows from the air pressure cylinder 13, through the strap 20 (also called strap contact finger in this field) and the air pressure valve 14 to the moving main contact 3 and the static side main contact 2.

[0084] The present invention provides a circuit breaker structure, which has the following advantages compared with the traditional circuit breaker structure:

[0085] First, efficient breaking and connecting capability: through the cooperation of the air cylinder and the transmission parts, the moving main contact and the static main contact can be quickly disconnected or connected, which improves the response speed and operating efficiency of the circuit breaker.

[0086] Second, compact and modular structure: The circuit breaker body consists of modules such as the static side base, the dynamic side base and the compressed air cylinder, which is easy to assemble and maintain, while reducing the overall volume and weight.

[0087] Third, electrical isolation and safety: An insulating pad is set between the moving main contact and the air compressor valve, which effectively realizes potential isolation, improves the safety and reliability of the equipment, and prevents the occurrence of electrical failures.

[0088] Fourth, flexible conduction structure: The design of the conduction unit allows the moving main contact to contact with the static main contact under a variety of conditions to achieve conduction, which increases the applicability and flexibility of the circuit breaker.

[0089] Fifth, stable guidance and support: The guide structure on the insulating tube support provides stable guidance and support for the moving main contact, ensuring its stability and accuracy during movement and reducing mechanical wear.

[0090] Sixth, optimization of insulation components: The insulation components adopt the design of sliding cooperation between rollers and guide plates, which not only reduces friction resistance, but also improves insulation performance and guiding accuracy, and extends the service life of the equipment.

[0091] Seventh, easy maintenance: The moving main contact is fixed to the compressed air valve by screws and other fasteners, which is convenient for disassembly and replacement of parts, reducing maintenance costs and time.

[0092] Eighth, enhance electrical performance: the insulating groove adopts an arc groove structure and is designed with sufficient cross-sectional area to ensure good electrical insulation effect, while providing enough space for the roller to roll and ensure smooth guidance.

[0093] Ninth, extend the service life: The length of the guide plate is greater than the axial movement length of the moving main contact, which provides additional protection and support, prevents the moving main contact from being offset or damaged during movement, and thus extends the service life of the entire circuit breaker.

[0094] It can be seen that through careful design and optimization, the circuit breaker structure has shown significant beneficial effects in improving operating efficiency, enhancing electrical performance, improving safety and reliability, and facilitating maintenance.

[0095] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A circuit breaker structure, It is characterized in that including a circuit breaker body; The circuit breaker body comprises a static side base (1), a dynamic side base (10) and a pressure cylinder (13); A static side main contact (2) is fixed on the static side base (1); A conduction unit is provided on the moving side base (10); A transmission member is inserted into the air compression cylinder (13), and the transmission member is connected to the air compression valve (14) of the air compression cylinder (13); A moving main contact (3) capable of sliding between the conduction unit and the static side main contact (2) is fixed on the air compression valve (14); The transmission member can drive the moving main contact (3) to move synchronously via the compressed air valve (14) to achieve disconnection or conduction between the conduction unit and the static side main contact (2).

2. A circuit breaker structure according to claim 1, It is characterized in that The conduction unit comprises a moving side static main contact (5) fixed on a moving side base (10); the moving main contact (3) is always in contact with the moving side static main contact (5); when the moving main contact (3) is in contact with the static side main contact (2), the moving side static main contact (5) and the static side main contact (2) are conducted; when the moving main contact (3) is separated from the static side main contact (2), the moving side static main contact (5) and the static side main contact (2) are disconnected.

3. A circuit breaker structure according to claim 2, It is characterized in that An insulating pad (16) is provided between the moving main contact (3) and the air compression valve (14) for isolating the moving main contact (3) from the air compression valve (14) in terms of potential.

4. A circuit breaker structure according to claim 3, It is characterized in that The moving main contact (3) is fixed to the compressed air valve (14) by means of a screw (8); the screw (8) passes through a gasket (7), an insulating sleeve (6), the compressed air valve (14), the insulating gasket (16) and the moving main contact (3) in sequence, and is threadedly connected to the moving main contact (3).

5. A circuit breaker structure according to claim 1, It is characterized in that The conduction unit comprises a strap (20); the outer side of the strap (20) is connected to the inner wall of the air compression cylinder (13), and the inner side is fixed to the outer wall of the air compression valve (14); the moving main contact (3) is electrically connected to the air compression valve (14).

6. A circuit breaker structure according to claim 1, It is characterized in that The air cylinder (13) is provided with an insulating cylinder support (17) for supporting an insulating cylinder (18); the insulating cylinder support (17) is provided with a guide structure (4); the guide structure (4) is located at the bottom of the inner wall of the moving main contact (3) and is used to provide guidance and support force for the moving main contact (3).

7. A circuit breaker structure according to claim 6, It is characterized in that The guide structure (4) comprises pressure plates (41) arranged on two sides and an insulating component (42) connected between the pressure plates (41) on both sides; The pressing plate (41) is fixed on the insulating tube support (17) by crimping; The insulating component (42) includes a plurality of rollers (42-3); A guide plate (3-2) is provided at the bottom of the inner wall of the moving main contact (3); The guide plate (3-2) and the roller (42-3) are slidably matched to guide the moving main contact (3).

8. A circuit breaker structure according to claim 7, It is characterized in that The insulating assembly (42) further comprises an insulating bottom plate (42-1); an insulating groove is provided on the insulating bottom plate (42-1); limiting blocks (42-2) are respectively arranged on both sides of the insulating groove; a central axis (42-4) is fixed between the limiting blocks (42-2) on both sides; and a plurality of rollers (42-3) are sleeved on the central axis (42-4).

9. A circuit breaker structure according to claim 8, It is characterized in that The insulating groove adopts an arc groove structure, and the arc cross-sectional area of ​​the insulating groove is larger than the area of ​​the semicircle; wherein the semicircle has the axis of the central axis (42-4) as the center and the outer diameter of the limit block (42-2) as the radius.

10. A circuit breaker structure according to claim 7, It is characterized in that The length of the guide plate (3-2) is greater than the axial movement length of the moving main contact (3).

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