Contact system capable of increasing contact opening distance

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a contact system capable of increasing the opening distance of contacts, which comprises a shell, a contact system, an arc extinguishing system, a transmission system and a transmission spring are mounted in the shell, the contact system comprises an insulating part, moving contacts are symmetrically mounted on the outer wall of the insulating part, and static contact plates are arranged on two sides of the outside of the insulating part. A static contact is mounted at one end, close to the insulating part, of the static contact plate; and the center of the insulating part is rotationally connected with the inner wall of the shell through a pin shaft. According to the contact system capable of increasing the opening distance of the contact, through the ingenious cooperation of the transmission spring and the insulating part, the contact system achieves the remarkable amplification of the closing and opening angles under the limited rotation angle of the transmission system. When the transmission system drives the insulating part to rotate, the elastic potential energy of the transmission spring is utilized to enable the insulating part (and the moving contact) to continuously rotate by a certain angle after the transmission system stops driving, so that the opening distance between the moving contact and the static contact is effectively increased.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and more specifically, to a contact system that increases the contact opening distance. Background Technology

[0002] In power systems, circuit breakers are crucial control and protection devices, and their performance directly affects the safe and stable operation of the power system. The contact system is one of the core components of a circuit breaker, responsible for connecting and disconnecting the circuit. Traditional contact systems often suffer from limited contact spacing in their design, which restricts the circuit breaker's breaking capacity and arc-extinguishing performance.

[0003] Contact gap refers to the shortest distance between the moving and stationary contacts when the circuit is open. A sufficient contact gap ensures an effective insulating interval between the contacts when the circuit is broken, preventing arc reignition and short circuit faults. At the same time, a larger contact gap also allows the arc-extinguishing system to function better, quickly extinguishing the arc and protecting the circuit and equipment.

[0004] However, in traditional contact systems, due to structural design limitations, the transmission system often directly drives the opening and closing of the contacts, resulting in the contact opening distance being limited by the rotation angle of the transmission system. To meet the requirements for larger contact opening distances, it is usually necessary to increase the complexity and size of the transmission system, which not only increases manufacturing costs but also reduces the reliability and flexibility of the equipment.

[0005] Furthermore, traditional contact systems, due to the high contact speed during breaking, are prone to generating strong electric arcs and electromagnetic interference, which adversely affect the insulation performance of the equipment and the surrounding environment. Therefore, how to design a contact system that can increase the contact gap, improve breaking capacity, and simultaneously reduce electric arcs and electromagnetic interference has become an urgent problem to be solved in the field of circuit breaker technology. Utility Model Content

[0006] The purpose of this invention is to provide a contact system that increases the contact opening distance, in order to solve the problem mentioned in the background art that traditional contact systems often have limited contact opening distance in their design, which limits the breaking capacity and arc extinguishing performance of circuit breakers.

[0007] To achieve the above objectives, this utility model provides a contact system for increasing the contact gap, comprising a housing, inside which a contact system, an arc-extinguishing system, a transmission system, and a transmission spring are installed. The contact system includes an insulating component, with moving contacts symmetrically installed on the outer wall of the insulating component. Stationary contact plates are provided on both outer sides of the insulating component, and a stationary contact point is installed at one end of the stationary contact plate near the insulating component. The center of the insulating component is rotatably connected to the inner wall of the housing via a pin. The insulating component is driven to rotate by the transmission system, thereby causing the stationary contact point to contact or separate from the moving contact. The transmission spring increases the angle at which the contact system closes and opens relative to the rotation angle of the transmission system.

[0008] Preferably, the housing includes a base, and a cover is mounted on the top of the base.

[0009] Preferably, a limiting groove is provided in the middle of the cover to limit the range of motion of the transmission system.

[0010] Preferably, a wiring nut is installed at the end of the stationary contact plate away from the stationary contact plate.

[0011] Preferably, the outer wall of the stationary contact plate is provided with an annular groove, and the stationary contact point slides in conjunction with the annular groove.

[0012] Preferably, the arc-extinguishing system is installed on the outside of the insulating component and includes two semi-circular ring structures.

[0013] Preferably, the semi-circular annular structure of the arc extinguishing system includes a plurality of arc-shaped arc extinguishing grids arranged at equal intervals, and insulating plates are installed on the upper and lower sides of the arc extinguishing grids.

[0014] Preferably, the surface of the insulating component has an interface, and the output end of the transmission system is engaged with the interface.

[0015] Preferably, one end of the transmission spring is connected to the housing via a first connecting end, and the other end of the transmission spring is connected to an insulating component via a second connecting end.

[0016] Preferably, when the stationary contact is in contact with the moving contact, the insulating component rotates under the clockwise rotation of the transmission system, and the second connecting end is located to the right of the line connecting the first connecting end and the center of the insulating component. Under the pressure of the transmission spring, the insulating component continues to rotate. When the stationary contact is disconnected from the moving contact, the insulating component rotates counterclockwise by an angle A with the transmission system, and under the pressure of the transmission spring, the moving contact automatically rotates by an angle C to the disconnected position D1.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. In this contact system with increased contact gap, by introducing a clever combination of a transmission spring and an insulating component, this invention achieves a significant amplification of the closing and opening angles of the contact system within the limited rotation angle of the transmission system. When the transmission system drives the insulating component to rotate, the transmission spring utilizes its elastic potential energy to allow the insulating component (and the moving contact) to continue rotating at a certain angle after the transmission system stops driving, thereby effectively increasing the gap between the moving contact and the stationary contact. This design not only improves the breaking capacity of the circuit breaker but also ensures that sufficient insulation spacing is formed between the contacts when the circuit is broken, preventing arc reignition and short-circuit faults.

[0019] 2. In this contact system with increased contact spacing, the increased contact spacing provides a better working environment for the arc-extinguishing system. When the contacts separate, the larger spacing makes it easier for the arc to be elongated and extinguished, thereby improving the efficiency and reliability of the arc-extinguishing system. Simultaneously, the arc-extinguishing system in this invention adopts a semi-circular ring structure, containing multiple arc-shaped arc-extinguishing grids arranged at equal intervals. This design further enhances the arc-extinguishing effect and ensures the safe disconnection of the circuit.

[0020] 3. In this contact system with increased contact gap, the increased contact gap is achieved through the cooperation of the transmission spring and the insulating component, without increasing the complexity and size of the transmission system. This design not only reduces manufacturing costs but also improves the reliability and flexibility of the equipment. Furthermore, this invention integrates components such as the contact system, arc-extinguishing system, transmission system, and transmission spring into a housing, forming a compact and easily managed module, facilitating production, installation, and maintenance.

[0021] 4. In this contact system with increased contact spacing, the arc intensity generated during the breaking process is effectively controlled due to the increased contact spacing and optimized arc extinguishing system, thereby reducing the damage of the arc to the equipment's insulation performance and the surrounding environment. Simultaneously, the increased contact spacing also helps reduce electromagnetic interference generated during the breaking process, improving the equipment's electromagnetic compatibility. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a partial structural schematic diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the contact system in this utility model;

[0025] Figure 4 This is a schematic diagram of the arc-extinguishing system in this utility model;

[0026] Figure 5 This is a schematic diagram of the shell structure in this utility model;

[0027] The meanings of the labels in the diagram are as follows:

[0028] 1. Housing; 11. Limiting groove; 101. Cover; 102. Base; 2. Contact system; 201. Wiring nut; 202. Stationary contact plate; 203. Moving contact; 204. Insulating component; 205. Stationary contact point; 3. Arc extinguishing system; 301. Insulating plate; 302. Arc extinguishing grid plate; 4. Transmission system; 5. Transmission spring; 51. First connecting end; 52. Second connecting end; 6. Mounting fastener. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] This utility model provides a contact system that increases the contact gap, such as... Figures 1-5 As shown, the device includes a housing 1. Inside the housing 1, a contact system 2, an arc-extinguishing system 3, a transmission system 4, and a transmission spring 5 are installed. The contact system 2 includes an insulating component 204. Moving contacts 203 are symmetrically mounted on the outer wall of the insulating component 204. Stationary contact plates 202 are provided on both sides of the outer surface of the insulating component 204. A stationary contact 205 is mounted on one end of the stationary contact plate 202 near the insulating component 204. The center of the insulating component 204 is rotatably connected to the inner wall of the housing 1 via a pin. The insulating component 204 is driven to rotate by the transmission system 4, thereby causing the stationary contact 205 to contact or separate from the moving contact 203. The transmission spring 5 increases the angle of opening and closing of the contact system 2 relative to the rotation angle of the transmission system 4. Through the design of the transmission spring 5, this invention enables the contact system 2 (especially between the moving contact 203 and the stationary contact 205) to form a larger opening and closing angle under the limited rotation of the transmission system 4. This means that when the circuit breaker opens, the distance between the moving contact 203 and the stationary contact 205 (i.e., the contact gap) is significantly increased, thereby improving the breaking capacity and safety of the circuit breaker. The housing 1 is fixed to the corresponding assembly position of the circuit breaker by the mounting fastener 6.

[0031] Increased contact gaps help create a more effective insulation interval when the circuit is broken, preventing arc reignition and short-circuit faults. This is crucial for the stable operation of power systems and the protection of equipment.

[0032] The introduction of the transmission spring 5 allows for a flexible adjustment relationship between the rotation angle of the transmission system 4 and the actual opening and closing angle of the contact system 2. This design not only improves the flexibility of the transmission system but also enables the entire contact system to more precisely control the opening and closing state of the contacts.

[0033] Although this description does not directly mention the working principle of arc extinguishing system 3, the increased contact gap undoubtedly provides a better working environment for the arc extinguishing system. During the contact separation process, the larger gap helps the arc to lengthen and extinguish, thereby improving the efficiency and reliability of the arc extinguishing system.

[0034] The entire contact system is cleverly integrated inside the housing 1, including components such as the contact system 2, arc-extinguishing system 3, transmission system 4, and transmission spring 5. This compact design not only saves space but also makes the system's installation, commissioning, and maintenance much easier.

[0035] In this embodiment, the housing 1 includes a base 102, and a cover 101 is mounted on the top of the base 102. This split design facilitates the processing, assembly, and maintenance of the housing. The housing 1 provides robust protection for internal components (such as the contact system 2, the arc extinguishing system 3, the transmission system 4, etc.), ensuring the stability and durability of the contact system.

[0036] Specifically, a limiting groove 11 is provided in the middle of the cover 101 to limit the range of motion of the transmission system 4. The limiting groove 11 in the middle of the cover 101 effectively limits the range of motion of the transmission system 4, preventing excessive rotation or misalignment of the transmission system 4, thereby ensuring precise control and stable operation of the contact system 2.

[0037] Furthermore, a wiring nut 201 is installed at the end of the stationary contact plate 202 away from the stationary contact plate 202, which facilitates connection with external circuits and improves the convenience and reliability of wiring.

[0038] Furthermore, the outer wall of the stationary contact plate 202 is provided with an annular groove, and the stationary contact 205 slides in the annular groove. This design allows the stationary contact 205 to move flexibly within the annular groove, ensuring good contact and separation between the stationary contact 205 and the moving contact 203, and improving the stability and durability of the contact system 2.

[0039] Furthermore, the arc-extinguishing system 3 is installed on the outside of the insulating component 204 and includes two semi-circular ring structures. This layout facilitates the rapid containment and extinguishing of the electric arc, improving arc-extinguishing efficiency and safety.

[0040] Furthermore, the semi-circular annular structure of the arc-extinguishing system 3 includes several arc-shaped arc-extinguishing grid plates 302 arranged at equal intervals, with insulating plates 301 installed on the upper and lower sides of the arc-extinguishing grid plates 302. This further enhances the arc-extinguishing effect and prevents damage to the contact system 2 from the electric arc.

[0041] Furthermore, an interface is provided on the surface of the insulating component 204, and the output end of the transmission system 4 engages with the interface. This connection method is simple and reliable, facilitating the precise driving of the insulating component 204 (and the moving contact 203) by the transmission system 4.

[0042] Furthermore, one end of the transmission spring 5 is connected to the housing 1 via the first connecting end 51, and the other end of the transmission spring 5 is connected to the insulating member 204 via the second connecting end 52. This design allows the transmission spring 5 to store and release elastic potential energy, providing additional power for the rotation of the insulating member 204 (and the moving contact 203). The presence of the transmission spring 5 increases the angle of contact system closure and opening relative to the rotation angle of the transmission system 4, thereby increasing the contact opening distance and improving the breaking capacity and safety of the circuit breaker.

[0043] Furthermore, when the stationary contact 205 contacts the moving contact 203, driven by the clockwise rotation of the transmission system 4, the insulating component 204 rotates, and the moving contact 203 rotates from position D1 to position D2. The second connecting end 52 is located to the right of the line connecting the first connecting end 51 and the center of the insulating component 204. Under the pressure of the transmission spring 5, the insulating component 204 continues to rotate, and the moving contact 203 automatically rotates by angle A from D2 to position D3. At this time, the process of the moving contact 203 rotating by angle A from D2 to D3 is independent of the transmission system 4, achieving the effect of amplifying angle A. When the stationary contact 205 and the moving contact 203 are disconnected, the insulating component 204 rotates counterclockwise by angle A with the transmission system 4, and under the pressure of the transmission spring 5, the moving contact 203 automatically rotates by angle C to the disconnected position D1.

[0044] This invention utilizes the torque generated by the rotation of one end of an elastic element around the rotation center, after passing the position of the line connecting the rotation center and the other end of the elastic element, to automatically move forward. After being driven by a transmission component past the dead point, the contact moves automatically, thereby increasing the transmission angle, increasing the contact opening angle, and improving the contact gap.

[0045] In use, the contact system of this utility model with increased contact gap is initially in a stationary state, with the moving contact 203 and the stationary contact 205 either separated or in contact, depending on the current state of the circuit breaker. The transmission spring 5 is in a preloaded state, providing potential elastic potential energy for the rotation of the insulating component 204.

[0046] Closing process (from open to closed): Upon receiving the closing signal, the transmission system 4 begins to rotate clockwise. The output end of the transmission system 4 drives the insulating component 204 to rotate via a snap-fit ​​engagement, causing the moving contact 203 to move from position D1 to position D2. As the moving contact 203 approaches position D2, due to the preload of the transmission spring 5, the insulating component 204 rotates an additional angle A under the action of the transmission spring 5 while the transmission system 4 continues to rotate, bringing the moving contact 203 to position D3 and achieving tight contact with the stationary contact 205. During this process, the additional rotation angle A of the moving contact 203 from D2 to D3 is independently completed by the transmission spring 5, unrelated to the direct drive of the transmission system 4, thereby increasing the contact opening distance.

[0047] Upon receiving the disconnect signal, transmission system 4 begins to rotate counterclockwise. Insulator 204 rotates counterclockwise by angle A along with transmission system 4, and moving contact 203 begins to move from position D3 to position D2. After transmission system 4 stops rotating, due to the elastic potential energy of transmission spring 5, insulator 204 continues to rotate by angle C under the action of transmission spring 5, causing moving contact 203 to fully move to the disconnect position D1, completely separating from stationary contact 205. During this process, the additional rotation angle C of moving contact 203 from D2 to D1 is also independently completed by transmission spring 5, ensuring complete contact disconnection and sufficient contact gap.

[0048] Arc extinguishing process (accompanied by disconnection process): When the moving contact 203 separates from the stationary contact 205, an electric arc may be generated.

[0049] The arc-extinguishing system 3's arc-extinguishing grid 302 and insulating plate 301 rapidly surround the electric arc, extinguishing it by elongating and cooling it. The increased contact gap provides a better working environment for the arc-extinguishing system, contributing to improved arc-extinguishing efficiency and reliability.

[0050] System Stability and Protection: The housing 1 (including the base 102 and the cover 101) provides robust protection for the internal components, ensuring the stability and durability of the contact system. The limiting groove 11 in the middle of the cover 101 restricts the range of motion of the transmission system 4, preventing excessive rotation or misalignment and ensuring precise control and stable operation of the contact system. The annular groove design of the stationary contact plate 202 allows the stationary contact 205 to move flexibly, ensuring good contact and separation effects.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A contact system for increasing contact gap, comprising a housing (1), characterized in that: The housing (1) is equipped with a contact system (2), an arc extinguishing system (3), a transmission system (4), and a transmission spring (5). The contact system (2) includes an insulating component (204). Moving contacts (203) are symmetrically installed on the outer wall of the insulating component (204). Static contact plates (202) are provided on both sides of the outer side of the insulating component (204). A static contact point (205) is installed at one end of the static contact plate (202) near the insulating component (204). The center of the insulating component (204) is rotatably connected to the inner wall of the housing (1) through a pin. The insulating component (204) is driven to rotate by the transmission system (4), thereby causing the static contact point (205) to contact or separate from the moving contact (203). The transmission spring (5) makes the angle of the contact system (2) closing and opening larger relative to the rotation angle of the transmission system (4). The housing (1) includes a base (102), and a cover (101) is mounted on the top of the base (102); The cover (101) is provided with a limiting groove (11) in the middle to limit the range of motion of the transmission system (4).

2. The contact system for increasing contact gap according to claim 1, characterized in that: A wiring nut (201) is installed at the end of the stationary contact plate (202) away from the stationary contact plate (202).

3. The contact system for increasing contact gap according to claim 1, characterized in that: The outer wall of the stationary contact plate (202) is provided with an annular groove, and the stationary contact point (205) slides in conjunction with the annular groove.

4. The contact system for increasing contact gap according to claim 1, characterized in that: The arc extinguishing system (3) is installed on the outside of the insulating component (204) and includes two semi-circular ring structures.

5. The contact system for increasing contact gap according to claim 4, characterized in that: The semi-circular structure of the arc extinguishing system (3) includes several arc-shaped arc extinguishing grid plates (302) arranged at equal intervals, and insulating plates (301) are installed on the upper and lower sides of the arc extinguishing grid plates (302).

6. The contact system for increasing contact gap according to claim 1, characterized in that: The surface of the insulating component (204) has an interface, and the output end of the transmission system (4) is engaged with the interface.

7. The contact system for increasing contact gap according to claim 1, characterized in that: One end of the transmission spring (5) is connected to the housing (1) through the first connecting end (51), and the other end of the transmission spring (5) is connected to the insulating component (204) through the second connecting end (52).

8. The contact system for increasing contact gap according to claim 7, characterized in that: When the stationary contact (205) contacts the moving contact (203), the insulating component (204) rotates under the clockwise rotation of the transmission system (4). The second connecting end (52) is located to the right of the line connecting the first connecting end (51) and the center of the insulating component (204). Under the pressure of the transmission spring (5), the insulating component (204) continues to rotate. When the stationary contact (205) and the moving contact (203) are disconnected, the insulating component (204) rotates counterclockwise by an angle A with the transmission system (4). Under the pressure of the transmission spring (5), the moving contact (203) automatically rotates by an angle C to the disconnected position D1.

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