Arc extinguish chamber structure of high-voltage circuit breaker

Abstract

The utility model discloses an arc extinguish chamber structure of a high-voltage circuit breaker, which belongs to the technical field of high-voltage circuit breakers and comprises a static contact seat and a conductive seat, a moving contact is mounted in the conductive seat, a nozzle piece is arranged at the right end of the moving contact, a variable-diameter guide cylinder is mounted in the static contact seat, and a static arc contact extending into the variable-diameter guide cylinder is arranged at the right end of the static contact seat. The variable-diameter guide cylinder is sleeved with an inner cavity of the static contact seat, the outer diameter of the nozzle piece is matched with the small inner diameter of the variable-diameter guide cylinder, the variable-diameter guide cylinder plays a role in auxiliary guiding and backflow prevention for the nozzle piece, the nozzle piece is beneficial to airflow diffusion, and the small-diameter portion of the variable-diameter guide cylinder can effectively prevent airflow backflow. The variable-diameter guide cylinder gives consideration to centering of the arc extinguish chamber and air flow formation in the opening process of the arc extinguish chamber, ensures the breaking capacity, is simple and ingenious in structural design, effectively solves the problems of complex connection structure and low reliability caused by the split type design of the nozzle, and can effectively improve the assembly efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of high-voltage circuit breaker technology, specifically a high-voltage circuit breaker arc-extinguishing chamber structure. Background Technology

[0002] High-voltage circuit breakers can not only cut off or close the no-load current and load current in high-voltage circuits, but also cut off overload current and short-circuit current through the action of relay protection devices when a system fault occurs. They have a fairly complete arc-extinguishing structure and sufficient breaking capacity. Therefore, the reliability of high-voltage circuit breakers is very important for the stable operation of the power grid.

[0003] To achieve a predetermined breaking capacity, different manufacturers use different design structures to meet the air blowing requirements for arc extinguishing in circuit breaker arc-extinguishing chambers. For example, Chinese patent application CN107146737B, after its authorization announcement, discloses an arc-extinguishing chamber including a conductive base and a moving contact installed in the conductive base. The moving contact and the conductive base together form an air chamber. An annular mounting groove is provided on the sliding mating surface of the moving contact and the conductive base, and a sealing ring is installed in the annular mounting groove. The key feature is that the moving contact also has a compressed air channel connecting the annular mounting groove and the air chamber. The compressed air channel is connected to the annular mounting groove through the bottom of the groove and, when the moving contact trips, causes the gas in the air chamber to blow against the sealing ring. The arc-extinguishing chamber is a self-powered type, applying radial outward pressure. The moving contact includes a cylindrical contact base with a bottom for connection to a pull rod. A one-way valve is installed on the bottom. The conductive base includes a cylindrical conductive base. The moving contact is guided and engaged with the inner circumferential surface of the cylindrical conductive base through the outer circumferential surface of the cylindrical contact base. The bottom of the contact base and the conductive base form an air chamber. The contact base has an annular flange extending towards the inner cavity of the air chamber at the edge of the bottom. An annular mounting groove is located on the outer circumferential surface of the annular flange. The compressed air passage is a through hole radially penetrating the annular flange. The inner opening of the through hole is located on the inner circumferential surface of the annular flange, and the outer opening of the through hole is located at the bottom of the annular mounting groove. However, this split structure often leads to a more complex arc-extinguishing chamber structure in high-voltage circuit breakers, making it difficult to guarantee reliability. Utility Model Content

[0004] In order to overcome the shortcomings of the existing split-type high-voltage circuit breaker arc-extinguishing chamber structure being relatively complex and difficult to guarantee reliability, this utility model provides a high-voltage circuit breaker arc-extinguishing chamber structure.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a high-voltage circuit breaker arc-extinguishing chamber structure, including a stationary contact seat and a conductive seat, a moving contact is installed in the conductive seat, a nozzle is provided at the right end of the moving contact, a variable diameter guide cylinder that cooperates with the nozzle is installed in the stationary contact seat, and a stationary arc contact that extends into the variable diameter guide cylinder is provided at the right end of the stationary contact seat.

[0006] As a further improvement of this utility model, the moving contact and the conductive base are slidably connected.

[0007] As a further improvement of this utility model, the variable diameter guide cylinder has a stepped variable diameter structure that is narrower on the left and wider on the right.

[0008] As a further improvement of this utility model, the inner cavity of the nozzle is a trumpet shape that diffuses from the center to both sides.

[0009] As a further improvement of this utility model, the outer diameter of the nozzle component matches the small inner diameter of the left end of the variable diameter guide cylinder.

[0010] As a further improvement of this utility model, the variable diameter guide cylinder is fixed inside the stationary contact seat by a set screw.

[0011] As a further improvement of this utility model, when the throat diameter of the nozzle part leaves the stationary arc contact, the right end of the nozzle part is exactly aligned with the diameter changing part of the diameter changing guide cylinder.

[0012] As can be seen from the above technical solution, the beneficial effects of this utility model are: the structure is simple and ingenious. The variable diameter guide cylinder is fitted into the inner cavity of the stationary contact seat. The outer diameter of the nozzle part matches the small inner diameter of the variable diameter guide cylinder. The variable diameter guide cylinder plays an auxiliary guiding role for the nozzle part and prevents backflow. In addition, the nozzle part is conducive to airflow diffusion. The small diameter part of the variable diameter guide cylinder will effectively prevent airflow backflow. The variable diameter guide cylinder takes into account the centering of the arc-extinguishing chamber and the airflow formation during the arc-extinguishing chamber opening process, ensuring the breaking capacity. The structure is simple and ingenious, effectively solving the problems of complex connection structure and low reliability caused by the separate nozzle design, and can effectively improve assembly efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the arc-extinguishing chamber structure of a high-voltage circuit breaker according to the present invention.

[0015] Figure 2 This is a structural diagram of the closing position of this utility model.

[0016] Figure 3 This is a schematic diagram of the structure of the present invention, showing the separation of the moving contact and the stationary arc contact.

[0017] Figure 4 This is a schematic diagram of the structure of the nozzle component of this utility model, which is separated from the stationary arc contact.

[0018] Figure 5 This is a structural schematic diagram of the opening position of this utility model.

[0019] In the diagram: 1. Stationary contact seat; 2. Variable diameter guide cylinder; 3. Set screw; 4. Nozzle; 5. Stationary arc contact; 6. Conductive seat; 7. Moving contact. Detailed Implementation

[0020] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] Reference Figure 1 This utility model discloses a high-voltage circuit breaker arc-extinguishing chamber structure, including a stationary contact seat 1 and a conductive seat 6. A moving contact 7 is installed in the conductive seat 6. A nozzle 4 is provided at the right end of the moving contact 7. A variable diameter guide cylinder 2 that cooperates with the nozzle 4 is installed in the stationary contact seat 1. A stationary arc contact 5 extending into the variable diameter guide cylinder 2 is provided at the right end of the stationary contact seat 1.

[0022] Among them, the variable diameter guide cylinder 2 has a stepped variable diameter structure that is narrower on the left and wider on the right. The inner cavity of the nozzle 4 is a trumpet shape that diffuses from the center to both sides.

[0023] The moving contact 7 and the conductive base 6 are slidably connected. The inner cavity of the stationary contact 1 matches the large outer diameter of the variable diameter guide cylinder 2. The variable diameter guide cylinder 2 is fixed inside the stationary contact 1 by a set screw 3. The variable diameter guide cylinder 2 is fitted into the inner cavity of the stationary contact 1, and the set screw 3 is screwed into the threaded hole on the inner wall of the stationary contact 1 to limit and fix the variable diameter guide cylinder 2. The outer diameter of the nozzle 4 matches the small inner diameter of the variable diameter guide cylinder 2. During installation and movement, the variable diameter guide cylinder 2 plays an auxiliary guiding role for the nozzle 4 and prevents backflow.

[0024] Reference Figure 2 and Figure 5Initially, the circuit is closed, with nozzle 4 inserted into the variable-diameter guide cylinder 2. When the circuit begins to open, nozzle 4 moves to the left, and the stationary contact 1 and variable-diameter guide cylinder 2 are stationary components. During this stage, the variable-diameter guide cylinder 2 provides auxiliary guidance. When the throat diameter of nozzle 4 leaves the stationary contact 5, a strong airflow is generated in the large-diameter area of ​​nozzle 4 and variable-diameter guide cylinder 2. At this time, the end of nozzle 4 is precisely aligned with the variable-diameter section of variable-diameter guide cylinder 2, and the airflow channel exhibits a conical expansion trend, which is beneficial for airflow diffusion. Furthermore, the small-diameter section of variable-diameter guide cylinder 2 effectively prevents airflow backflow. After the opening operation ends, a small portion of the right end of nozzle 4 remains inserted in the small-diameter position of variable-diameter guide cylinder 2, providing auxiliary guidance for subsequent closing operations.

[0025] This structure is simple and ingenious, effectively solving the problems of complex connection structure and low reliability caused by the split nozzle design, and can effectively improve assembly efficiency.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high voltage circuit breaker arc chute structure, characterized by: It includes a stationary contact seat (1) and a conductive seat (6). A moving contact (7) is installed inside the conductive seat (6). A nozzle (4) is provided at the right end of the moving contact (7). A variable diameter guide cylinder (2) that cooperates with the nozzle (4) is installed inside the stationary contact seat (1). A stationary arc contact (5) that extends into the variable diameter guide cylinder (2) is provided at the right end of the stationary contact seat (1).

2. The arc chute structure of claim 1, wherein: The moving contact (7) and the conductive base (6) are slidably connected.

3. The arc chute structure of claim 2, wherein: The variable diameter guide cylinder (2) has a stepped variable diameter structure that is narrow on the left and wide on the right.

4. The arc chute structure of claim 3, wherein: The inner cavity of the nozzle (4) is a trumpet shape that diffuses from the center to both sides.

5. The arc chute structure of claim 4, wherein: The outer diameter of the nozzle component (4) matches the small inner diameter of the left end of the variable diameter guide cylinder (2).

6. The arc chute structure of claim 5, wherein: The variable diameter guide cylinder (2) is fixed inside the stationary contact seat (1) by the set screw (3).

7. The arc-extinguishing chamber structure of a high-voltage circuit breaker according to claim 6, characterized in that: When the throat diameter of the nozzle (4) leaves the stationary arc contact (5), the right end of the nozzle (4) is exactly aligned with the diameter-changing part of the variable diameter guide cylinder (2).

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