Insulating cylinder, arc extinguish chamber and circuit breaker

Abstract

The utility model relates to an insulating cylinder, an arc extinguish chamber and a circuit breaker, the insulating cylinder comprises at least two cylinder body units, each cylinder body unit comprises a middle cylinder body and end cylinder bodies located at two ends of the middle cylinder body, the inner diameter of the middle cylinder body is larger than that of the end cylinder bodies, and the inner diameters of the end cylinder bodies decrease progressively from one side close to the middle cylinder body to one side far away from the middle cylinder body. According to the insulating cylinder, the volume of the inner cavity of the middle part is increased, so that hot airflow generated during arc combustion has more diffusion space, and the arc can be quickly extinguished; and the cylinder wall structure design of the insulating cylinder enables the creepage distance of the arc to be increased, so that the fracture insulating capability of the arc extinguish chamber can be improved, and the arc extinguishing performance and the insulating performance of the circuit breaker can be improved while the inner diameter and the size of the shell of the circuit breaker are ensured to be smaller.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to an insulating cylinder, an arc extinguishing chamber and a circuit breaker. Background Art

[0002] The arc extinguishing chamber of the circuit breaker includes a moving side part, a static side part and a supporting insulating cylinder arranged between the moving and static sides. When the circuit breaker is in the open state, the moving side part and the static side part are subjected to a voltage difference, and the insulating cylinder made of insulating medium helps to maintain good insulation matching between the fractures. In addition, the insulating cylinder also needs to consider the insulation matching with the circuit breaker casing. Therefore, the design of the insulating cylinder and its internal shielding will greatly affect the minimum inner diameter of the circuit breaker casing.

[0003] In the related art, the shielding member in the circuit breaker is cast and fixed in an insulating cylinder with a smaller inner diameter to reduce the outer diameter of the shielding member, thereby reducing the inner diameter of the circuit breaker housing, and further reducing the volume of the circuit breaker, thereby achieving the effect of reducing the use of insulating gas in the insulating cylinder while reducing the production cost of the circuit breaker. However, the insulating cylinder with a smaller inner diameter makes the creepage distance smaller, resulting in a decrease in the insulation performance of the insulating cylinder, thereby resulting in a decrease in the insulation performance of the circuit breaker. Utility Model Content

[0004] Based on this, it is necessary to provide an insulating cylinder, an arc extinguishing chamber and a circuit breaker to address the problem of reduced insulation performance of the circuit breaker.

[0005] In a first aspect, the present application provides an insulating cylinder comprising at least two cylinder units, the cylinder units comprising a middle cylinder and end cylinders located at both ends of the middle cylinder, the inner diameter of the middle cylinder is larger than the inner diameter of the end cylinder, and the inner diameter of the end cylinder decreases from a side close to the middle cylinder to a side away from the middle cylinder.

[0006] In one of the embodiments, a heat exchange gap is reserved on one side of two adjacent cylinder units for heat exchange of the insulating gas in the insulating cylinder.

[0007] In one of the embodiments, a first arc surface is provided at the connection between the middle cylinder and the end cylinder, which is curved toward a side away from the center of the cylinder unit.

[0008] In one embodiment, the outer surface of the end of the end cylinder away from the middle cylinder is a second arc surface that curves toward a side away from the center of the end cylinder.

[0009] In a second aspect, the present application further provides an arc extinguishing chamber, comprising any one of the insulating cylinders provided in the first aspect, wherein one end cylinder of the cylinder unit is set as a first end cylinder, and the other end cylinder of the cylinder unit is set as a second end cylinder, and the arc extinguishing chamber further comprises:

[0010] A stationary contact seat, which is arranged close to the first end cylinder and is detachably connected to the first end cylinder via a connecting assembly;

[0011] A moving contact seat, which is arranged close to the second end cylinder and is detachably connected to the second end cylinder via a connecting assembly;

[0012] A shielding member is disposed within the insulating cylinder.

[0013] In one embodiment, the connection component includes:

[0014] A connecting portion, the connecting portion being arranged at one end of the end cylinder away from the middle cylinder;

[0015] A connecting piece is used to detachably connect the static contact seat or the moving contact seat to the corresponding connecting part.

[0016] In one embodiment, the connecting portion includes a connecting seat, and a mounting groove is provided on the end wall of the connecting seat away from one end of the middle cylinder. The side walls of the static contact seat and the moving contact seat are penetrated by mounting channels, and the mounting channels are connected to the mounting groove. The connecting part includes a bolt, and the bolt passes through one end of the mounting channel and is threadedly connected to the mounting groove.

[0017] In one embodiment, a gasket is disposed in the mounting channel.

[0018] In one embodiment, a first gap is reserved between the stationary contact seat and the first end cylinder, and a second gap is reserved between the moving contact seat and the second end cylinder.

[0019] In a third aspect, the present application further provides a circuit breaker, comprising any arc extinguishing chamber provided in the second aspect, the circuit breaker further comprising a shell, wherein the arc extinguishing chamber and the insulating cylinder are both arranged in the shell.

[0020] The above-mentioned insulating cylinder includes at least two cylinder units, and the cylinder units include a middle cylinder and end cylinders located at both ends of the middle cylinder. The inner diameter of the middle cylinder is larger than the inner diameter of the end cylinders, and the inner diameters of the end cylinders decrease from the side close to the middle cylinder to the side far from the middle cylinder. Since the inner cavity volume of the middle part of the above-mentioned insulating cylinder is increased, the hot air flow generated when the arc burns has more diffusion space, thereby prompting the arc to be extinguished faster; and the cylinder wall structure of the above-mentioned insulating cylinder increases the electrical insulation distance (creepage distance), that is, the path that the current needs to pass through the insulating cylinder is longer, thereby improving the insulation tolerance between the breaks of the arc extinguishing chamber, and then while ensuring that the inner diameter and volume of the circuit breaker shell are small, the arc extinguishing performance and insulation performance of the circuit breaker can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] FIG. 1 is a schematic structural diagram of an insulation cylinder in some embodiments of the present application.

[0023] FIG. 2 is a schematic diagram of the structure of a cylinder unit in some embodiments of the present application.

[0024] 3 is a schematic structural diagram for illustrating the connection relationship between the middle cylinder, the end cylinder, the static contact seat, the moving contact seat and the connecting seat in some embodiments of the present application.

[0025] FIG. 4 is an enlarged schematic diagram of part A in FIG. 3 .

[0026] Description of Figure Numbers:

[0027] 100, cylinder unit; 110, middle cylinder; 120, end cylinder; 122, first end cylinder; 124, second end cylinder; 130, first arc surface; 140, second arc surface; 150, heat exchange gap; 200, static contact seat; 210, first gap; 300, moving contact seat; 310, second gap; 400, connecting assembly; 410, connecting part; 412, mounting groove; 420, connecting piece; 430, gasket; 500, shell; 600, moving side shielding cover; 700, static side shielding cover; 800, mounting channel. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] In order to solve the problem of reduced insulation performance of circuit breakers in the related art, on the first hand, referring to Figure 1, an embodiment of the present application provides an insulating cylinder, including at least two cylinder units 100, the cylinder unit 100 includes a middle cylinder 110 and end cylinders 120 located at both ends of the middle cylinder 110, the inner diameter of the middle cylinder 110 is larger than the inner diameter of the end cylinder 120, and the inner diameter of the end cylinder 120 decreases from the side close to the middle cylinder 110 to the side away from the middle cylinder 110.

[0035] Specifically, the cross section of the barrel unit 100 is fan-shaped, and the fan-shaped angle is less than 180°. The middle barrel 110 and the end barrel 120 in the barrel unit 100 are integrally formed.

[0036] In this embodiment, since the inner cavity volume of the middle part of the insulating cylinder is increased, the hot air flow generated when the arc burns has more diffusion space, thereby promoting the arc to be extinguished faster; and the cylinder wall structure of the above-mentioned insulating cylinder increases the electrical insulation distance (creepage distance), that is, the path required for the current to pass through the insulating cylinder is longer, thereby improving the insulation tolerance between the arc extinguishing chamber breaks, and further, while ensuring that the inner diameter and volume of the housing 500 of the circuit breaker are small, the arc extinguishing performance and insulation performance of the circuit breaker can be improved.

[0037] Continuing to refer to FIG. 1 , in some embodiments, a heat exchange gap 150 is reserved on one side of two adjacent cylinder units 100 for heat exchange of the insulating gas in the insulating cylinder.

[0038] Specifically, according to the above content, the cross section of the cylinder unit 100 is fan-shaped. When at least two cylinder units 100 are spliced ​​into a complete insulation cylinder, the insulation cylinder as a whole is approximately cylindrical, and at least two heat exchange gaps 150 are reserved on the side wall of the insulation cylinder.

[0039] In this embodiment, since the arc extinguishing chamber of the circuit breaker will generate a large amount of hot air flow due to the burning of the arc after the current is interrupted, a heat exchange gap 150 is reserved between two adjacent cylinder units 100, which can promote the heat exchange of the insulating gas in the insulating cylinder, that is, it can help cool the insulating gas, thereby improving the arc extinguishing effect and insulation performance of the circuit breaker.

[0040] 1 and 2 , in some embodiments, a first arc surface 130 is provided at the connection between the middle cylinder 110 and the end cylinder 120, which is bent toward the side away from the center of the cylinder unit 100, that is, the inner surface of one end of the end cylinder 120 close to the middle cylinder 110 smoothly transitions to the inner surface of the middle cylinder 110, and the inner side of one end of the end cylinder 120 close to the middle cylinder 110 presents a concave structure that is concave toward the outside.

[0041] In this embodiment, a first arc surface 130 that bends toward a side away from the center of the middle cylinder 110 is provided at the connection between the middle cylinder 110 and the end cylinder 120, which helps to further increase the inner cavity volume of the insulating cylinder, that is, to allow more diffusion space for the hot air flow generated during arc discharge, thereby helping to reduce the concentration, pressure and temperature of the gas in the insulating cylinder, thereby causing the arc to extinguish faster.

[0042] 2 , in some embodiments, the outer surface of the end cylinder 120 away from the middle cylinder 110 is a second arc surface 140 that is curved toward a side away from the center of the end cylinder 120 .

[0043] In this embodiment, the outer surface of the end cylinder 120 away from the middle cylinder 110 is set to a second arc surface 140 that is bent toward the side away from the center of the end cylinder 120, which helps to increase the insulation distance of the outer surface of the insulating cylinder, that is, it helps to extend the discharge path and increase the creepage distance of the circuit breaker, thereby improving the arc extinguishing performance and insulation performance of the circuit breaker.

[0044] The inner cavity volume of the middle part of the insulating cylinder in the present application is increased, so that the hot air flow generated when the arc burns has more diffusion space, thereby promoting the arc to be extinguished faster; and the cylinder wall structure of the above-mentioned insulating cylinder increases the electrical insulation distance (creepage distance), that is, the path required for the current to pass through the insulating cylinder is longer, thereby improving the insulation tolerance between the arc extinguishing chamber breaks, and then while ensuring that the inner diameter and volume of the housing 500 of the circuit breaker are small, the arc extinguishing performance and insulation performance of the circuit breaker can be improved.

[0045] In the second aspect, referring to Figure 3, the present application also includes an arc extinguishing chamber, in which one of the end cylinders 120 of the cylinder unit 100 is set as the first end cylinder 122, and the other end cylinder 120 of the cylinder unit 100 is set as the second end cylinder 124, and the arc extinguishing chamber includes any one of the insulating cylinders provided in the first aspect, and the arc extinguishing chamber also includes a static contact seat 200, a moving contact seat 300 and a shielding member arranged in the insulating cylinder, the static contact seat 200 is arranged close to the first end cylinder 122, and is detachably connected to the first end cylinder 122 through a connecting assembly 400, and the moving contact seat 300 is arranged close to the second end cylinder 124, and is detachably connected to the second end cylinder 124 through a connecting assembly 400.

[0046] Among them, the static contact seat 200 and the moving contact seat 300 are arranged opposite to each other, and the shielding member includes a moving side shielding cover 600 and a static side shielding cover 700. One end of the moving side shielding cover 600 is connected to the moving contact seat 300, and the other end of the moving side shielding cover 600 extends into the inner cavity formed by the middle cylinder 110. One end of the static side shielding cover 700 is connected to the static contact seat 200, and the other end of the static side shielding cover 700 extends into the inner cavity formed by the middle cylinder 110. When assembling the arc extinguishing chamber, the cylinder unit 100 can be connected with the corresponding static contact seat 200 and the moving contact seat 300 in sequence through the connecting assembly 400. After installation, the moving side shielding cover 600 and the static side shielding cover 700 are both located inside the insulating cylinder.

[0047] In this embodiment, the cylinder unit 100 is detachably connected with the corresponding static contact seat 200 and the moving contact seat 300 in sequence through the connecting assembly 400, which facilitates the separation of the cylinder unit 100 from other components in the insulating cylinder, thereby facilitating the inspection and maintenance of the arc extinguishing chamber to ensure the arc extinguishing reliability and stability of the arc extinguishing chamber.

[0048] 3 and 4 , in some embodiments, the connection assembly 400 includes a connection portion 410 and a connection member 420 , wherein the connection portion 410 is disposed at one end of the end cylinder 120 away from the middle cylinder 110 , and the connection member 420 is used to detachably connect the static contact seat 200 or the moving contact seat 300 to the corresponding connection portion 410 .

[0049] In this embodiment, through the cooperation of the connecting part 410 and the connecting piece 420, stronger support and stable installation can be provided, so that the insulating cylinder static contact seat 200 and the moving contact seat 300 can be better fixed, and the design of the connecting part 410 can ensure that the connection between the connecting piece 420 and the insulating cylinder is more secure, and can share the weight of the insulating cylinder and the impact force that may be caused by the outside world, thereby helping to reduce vibration and stress concentration, and further helping to reduce the failure rate of the circuit breaker and extend the service life of the circuit breaker.

[0050] 3 and 4 , in some embodiments, the connecting portion 410 includes a connecting seat, and a mounting groove 412 is provided on the end wall of the connecting seat away from the middle cylinder 110. The side walls of the static contact seat 200 and the moving contact seat 300 are penetrated by mounting channels 800, and the mounting channels 800 are connected to the mounting groove 412. The connecting member 420 includes a bolt, and the bolt passes through one end of the mounting channel 800 and is threadedly connected to the mounting groove 412.

[0051] The connection seat is a metal connection column, which is cast in the end of the end cylinder 120 away from the middle cylinder 110, and the end of the connection seat away from the end cylinder 120 protrudes from the end wall of the end cylinder 120 away from the middle cylinder 110. The installation groove 412 is a threaded groove, and the bolt is threadedly connected to the installation groove 412.

[0052] Specifically, when the barrel unit 100 is placed between the corresponding stationary contact seat 200 and the movable contact seat 300 , the notch of the mounting groove 412 is opposite to the mounting channel 800 . At this time, one end of the bolt passes through the mounting channel 800 and is screwed into the mounting groove 412 .

[0053] In this embodiment, the threaded connection between the bolt and the mounting groove 412 facilitates the rapid assembly and disassembly between the cylinder unit 100 and the stationary contact seat 200 and the moving contact seat 300, and helps to ensure the tightness of the connection between the insulating cylinder and the stationary contact seat 200 and the moving contact seat 300. In addition, when the insulating cylinder is stably installed between the stationary contact seat 200 and the moving contact seat 300, the connection seat is higher than the insulating medium in the insulating cylinder, so that the insulating cylinder can be forced to separate from the stationary contact seat 200 and the moving contact seat 300 to avoid the generation of a wedge-shaped air gap, thereby avoiding the risk of arc breakdown due to electric field distortion, thereby ensuring the safety and reliability of the circuit breaker and the equipment during operation.

[0054] 3 and 4 , a gasket 430 is disposed in the mounting channel 800 .

[0055] Specifically, when the bolt passes through the installation channel 800 and is threadedly screwed into the installation groove 412 , the gasket 430 can protect the end wall of the installation channel 800 close to the installation groove 412 from wear.

[0056] 3 and 4 , in some embodiments, a first gap 210 is reserved between the stationary contact seat 200 and the first end cylinder 122 , and a second gap 310 is reserved between the movable contact seat 300 and the second end cylinder 124 .

[0057] In this embodiment, a first gap 210 is reserved between the static contact seat 200 and the first end cylinder 122, and a second gap 310 is reserved between the moving contact seat 300 and the second end cylinder 124, which can provide an insulation distance to prevent arc or current from being transmitted from the contact seat to the insulating cylinder, thereby helping to ensure good insulation performance between the insulating cylinder and the contact seat, and being able to accommodate mechanical connection and adjustment of the contact seat.

[0058] The arc extinguishing chamber in the present application realizes a detachable connection between the insulating cylinder and the static contact seat 200 and the moving contact seat 300 through the threaded cooperation of the connecting seat and the bolt, so as to separate the cylinder unit 100 in the insulating cylinder from other components, thereby facilitating the inspection and maintenance of the arc extinguishing chamber, thereby ensuring the arc extinguishing reliability and stability of the arc extinguishing chamber.

[0059] In the third aspect, referring to Figure 3, the present application also includes a circuit breaker, which includes any one of the insulating cylinders in the first aspect and any one of the arc extinguishing chambers in the second aspect, and the circuit breaker also includes a shell 500, the arc extinguishing chamber and the insulating cylinder are both arranged in the shell 500, and the end of the static contact seat 200 away from the insulating cylinder is fixedly connected to the inner wall of one side of the shell 500, and the end of the moving contact seat 300 away from the insulating cylinder is fixedly connected to the inner wall of the other side of the shell 500.

[0060] Specifically, there is no obstruction in the radial direction between the outer wall of the insulating cylinder and the inner wall of the shell 500, so that the space between the outer wall of the insulating cylinder and the inner wall of the shell 500 is relatively unobstructed, so that the insulating gas can flow, accelerate the conduction and heat dissipation of the heat generated inside the circuit breaker, thereby preventing the performance of the circuit breaker from being degraded due to excessive temperature.

[0061] Since the circuit breaker in the present application includes the above-mentioned insulating cylinder and arc extinguishing chamber, and due to the inner diameter setting of the above-mentioned insulating cylinder and the connection relationship setting between the insulating cylinder and the static contact seat 200 and the moving contact seat 300, the circuit breaker in the present application has good arc extinguishing performance and insulation performance while being small in size and low in production cost.

[0062] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An insulating cylinder, characterized in that: The insulating cylinder includes at least two cylinder units, and the cylinder unit includes a middle cylinder and end cylinders located at both ends of the middle cylinder. The inner diameter of the middle cylinder is larger than the inner diameter of the end cylinder, and the inner diameter of the end cylinder decreases from the side close to the middle cylinder to the side away from the middle cylinder.

2. The insulating cylinder according to claim 1, characterized in that: A heat exchange gap is reserved on one side where two adjacent cylinder units are close to each other for the insulating gas in the insulating cylinder to exchange heat.

3. The insulating cylinder according to claim 1, characterized in that: A first arc surface is provided at the connection between the middle cylinder and the end cylinder, which is curved toward a side away from the center of the cylinder unit.

4. The insulating cylinder according to claim 1, characterized in that: The outer surface of the end cylinder away from the middle cylinder is a second arc surface that curves toward a side away from the center of the end cylinder.

5. An arc extinguishing chamber, comprising the insulating tube according to any one of claims 1 to 4, characterized in that: One of the end cylinders of the cylinder unit is set as a first end cylinder, and the other end cylinder of the cylinder unit is set as a second end cylinder, and the arc extinguishing chamber further includes: A stationary contact seat, which is disposed close to the first end cylinder and is detachably connected to the first end cylinder via a connecting assembly; A moving contact seat, the moving contact seat is arranged close to the second end cylinder and is detachably connected to the second end cylinder through the connecting assembly; A shielding member is disposed within the insulating cylinder.

6. The arc extinguishing chamber according to claim 5, characterized in that: The connection component comprises: A connecting portion, the connecting portion being arranged at one end of the end cylinder away from the middle cylinder; A connecting piece, wherein the connecting piece is used to detachably connect the static contact seat or the moving contact seat with the corresponding connecting part.

7. The arc extinguishing chamber according to claim 6, characterized in that: The connecting portion includes a connecting seat, and a mounting groove is provided on the end wall of the connecting seat away from one end of the middle cylinder. The side walls of the static contact seat and the moving contact seat are penetrated by mounting channels, and the mounting channels are connected to the mounting groove. The connecting piece includes a bolt, and one end of the bolt passes through the mounting channel and is threadedly connected to the mounting groove.

8. The arc extinguishing chamber according to claim 7, characterized in that: A gasket is arranged in the installation channel.

9. The arc extinguishing chamber according to claim 6, characterized in that: A first gap is reserved between the stationary contact seat and the first end cylinder, and a second gap is reserved between the moving contact seat and the second end cylinder.

10. A circuit breaker, characterized in that: The circuit breaker comprises the arc extinguishing chamber according to any one of claims 5 to 9, and further comprises a shell, wherein the arc extinguishing chamber and the insulating cylinder are both arranged in the shell.

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