Self-energy arc extinguish chamber and circuit breaker

Abstract

The invention relates to a self-energy arc extinguish chamber and a circuit breaker. The self-energy arc extinguish chamber comprises a first contact module, a cylinder module and a second contact module. The first contact module comprises a contact seat, a static arc contact and a static contact, wherein the static arc contact and the static contact are arranged on the contact seat. The air cylinder module comprises a cylinder barrel, a valve seat arranged in the cylinder barrel and a pull rod penetrating through the valve seat. The second contact module comprises a moving arc contact, a moving contact and an elastic piece, the moving arc contact is arranged at one end of the pull rod and is clamped with the static arc contact, the moving contact is sleeved in a first end part, close to the moving arc contact, in the cylinder barrel and is clamped with the static contact, an expansion chamber is defined by the moving contact, the first end part and the valve seat, one end of the elastic piece is arranged in the first end part, and the other end of the elastic piece is arranged in the second end part. And the other end is arranged on the moving contact. When the moving arc contact and the static arc contact are separated to generate a large amount of arc heat which flows into the expansion chamber, the elastic piece in the expansion chamber is driven to be stretched, the moving contact connected with the elastic piece rises, and the volume of the expansion chamber is increased so as to store more gas, improve the gas blowing capability and improve the breaking performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage switch, in particular to a self-energy arc-extinguishing chamber and circuit breaker. BACKGROUND

[0002] The circuit breaker refers to a switch device capable of closing, carrying and opening the current under normal circuit conditions and capable of closing, carrying and opening the current under abnormal circuit conditions within a specified time, which has a relatively perfect arc-extinguishing structure and sufficient breaking current capacity.

[0003] The self-energy arc-extinguishing chamber is a commonly used arc-extinguishing structure of the circuit breaker, which mainly uses the arc ignited by the moving contact during the opening operation to make the arc burn between the arc contacts on both sides of the breaking point, thereby heating and expanding the chamber gas, increasing the gas pressure in the chamber, and using the gas blowing effect when the gas is discharged to the gas flow channel on both sides of the breaking point to extinguish the arc at the current zero crossing time, thereby breaking the current.

[0004] However, the volume of the current expansion chamber is fixed, and when a large current needs to be broken, the amount of gas that the expansion chamber can accommodate is small, which is prone to failure to extinguish the arc, thereby affecting the breaking performance. SUMMARY

[0005] Therefore, it is necessary to provide a self-energy arc-extinguishing chamber and circuit breaker to solve the problem that the gas capacity of the expansion chamber in the arc-extinguishing chamber cannot be changed according to the size of the breaking current, thereby affecting the breaking performance.

[0006] A self-energy arc-extinguishing chamber, comprising a first contact module, a cylinder module and a second contact module, wherein:

[0007] The first contact module comprises a contact seat, a static arc contact and a static contact arranged on the contact seat;

[0008] The cylinder module comprises a cylinder, a valve seat arranged in the cylinder, and a pull rod penetrating the valve seat;

[0009] The second contact module comprises a dynamic arc contact, a dynamic contact and an elastic member, the dynamic arc contact is arranged at one end of the pull rod and is used for clamping the static arc contact, the dynamic contact is sleeved on the first end portion of the cylinder close to the dynamic arc contact, the dynamic contact and the first end portion and the valve seat form an expansion chamber, and the dynamic contact is used for clamping the static contact, one end of the elastic member is arranged in the interior of the first end portion, and the other end of the elastic member is arranged on the dynamic contact.

[0010] The self-energizing arc-extinguishing chamber has one end of the elastic member arranged in the interior of the first end portion and the other end of the elastic member arranged on the moving contact. When the pull rod drives the moving arc contact to separate from the static arc contact, a large amount of arc heat will flow into the expansion chamber to drive the elastic member in the expansion chamber to be stretched, thereby pulling the moving contact connected with the elastic member to ascend along the axial direction of the cylinder, so that the volume of the expansion chamber can be changed according to the arc heat. When a large current is broken, the volume of the expansion chamber can be increased to store more gas, thereby improving the blowing capacity and breaking performance.

[0011] In one of the embodiments, the valve seat comprises a base arranged on the inner wall of the cylinder, and the base is connected with one end of the elastic member away from the moving contact.

[0012] In one of the embodiments, the moving contact comprises a first cylinder, a connecting wall and a second cylinder arranged in sequence. The first cylinder is movably sleeved on the first end portion along the axial direction of the first end portion. The connecting wall is connected with one end of the elastic member away from the base. The second cylinder is used for being inserted into the static contact.

[0013] In one of the embodiments, the elastic member is in a stretched state.

[0014] In one of the embodiments, the outer wall of the first end portion is provided with a sealing member, and the sealing member also abuts against the inner wall of the first cylinder.

[0015] In one of the embodiments, the static contact comprises a butt joint arranged around the outer periphery of the contact seat. The inner wall of the butt joint is provided with a conductive member for contacting the outer wall of the second cylinder.

[0016] In one of the embodiments, the self-energizing arc-extinguishing chamber further comprises a nozzle, and the nozzle comprises a first nozzle and a second nozzle covering the outside of the first nozzle. Wherein:

[0017] The first nozzle and the second nozzle have an air gap therebetween. The first nozzle covers the moving arc contact and is connected with the valve seat.

[0018] The outer side of the second nozzle abuts against the inner wall of the second cylinder. One end of the second nozzle away from the second cylinder is slidingly arranged on the contact seat.

[0019] The static arc contact is inserted into the moving arc contact after penetrating through the second nozzle and the first nozzle.

[0020] In one of the embodiments, the nozzle further comprises a connecting rod arranged between the first nozzle and the second nozzle, and the connecting rod is used for connecting the first nozzle and the second nozzle.

[0021] In one embodiment, the number of connecting rods is multiple, and the multiple connecting rods are arranged at the outer periphery of the first nozzle with the air gap formed between two adjacent connecting rods.

[0022] The application also provides a circuit breaker, which comprises an operating mechanism and the self-energizing arc-extinguishing chamber according to any one of the above embodiments, and the operating mechanism is connected with the pull rod in the self-energizing arc-extinguishing chamber.

[0023] The circuit breaker has the advantages that: by arranging one end of the elastic member in the self-energizing arc-extinguishing chamber inside the first end portion and the other end of the elastic member in the moving contact, when the pull rod drives the moving arc contact to separate from the static arc contact, a large amount of arc heat will flow into the expansion chamber to drive the elastic member in the expansion chamber to be stretched, thereby pulling the moving contact connected with the elastic member to ascend along the axial direction of the cylinder, so that the volume of the expansion chamber can change according to the arc heat, and when a large current is broken, the volume of the expansion chamber can be increased to store more gas, thereby improving the blowing capacity and the breaking performance. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The application provides a closing position diagram of the self-energizing arc-extinguishing chamber.

[0025] Figure 2 The application provides a heat flow diagram of the self-energizing arc-extinguishing chamber when the circuit breaker is opened.

[0026] Figure 3 The application provides a diagram of the expansion chamber capacity of the self-energizing arc-extinguishing chamber when the circuit breaker is opened.

[0027] Figure 4 The application provides a gas flow diagram of the self-energizing arc-extinguishing chamber when the circuit breaker is opened.

[0028] Figure 5 The application provides a sectional view of the nozzle.

[0029] In one embodiment, the number of connecting rods is multiple, and the multiple connecting rods are arranged at the outer periphery of the first nozzle with the air gap formed between two adjacent connecting rods.

[0030] 10, self-energizing arc extinguishing chamber; 20, electric arc; 100, first contact module; 110, contact seat; 111, bottom wall; 112, side wall; 113, accommodating space; 120, stationary arc contact; 130, stationary contact; 131, abutting piece; 132, conductive piece; 200, cylinder module; 210, valve seat; 211, base; 212, connecting cylinder; 220, cylinder; 221, first end portion; 230, pull rod; 240, sealing piece; 300, second contact module; 310, movable arc contact; 320, movable contact; 321, first cylinder body; 322, connecting wall; 323, second cylinder body; 330, elastic piece; 400, expansion chamber; 500, nozzle; 510, first spout; 520, second spout; 521, annular groove; 530, air gap; 540, connecting rod. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and it is intended that the present application cover all modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0032] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0034] In the present application, unless specifically defined otherwise, if there is an appearance of the terms "installation", "connection", "connection", "fixation" and the like, these terms should be interpreted in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the present application, unless specifically defined otherwise, if there is a description of the first feature "on" or "under" the second feature and the like, it means that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0037] Referring to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a closing position diagram of the self-acting arc-extinguishing chamber 10 provided by the present application, Figure 2 is a heat flow diagram of the self-acting arc-extinguishing chamber 10 provided by the present application when it is opened, Figure 3 is a diagram showing that the capacity of the expansion chamber 400 increases when the self-acting arc-extinguishing chamber 10 provided by the present application is opened. The self-acting arc-extinguishing chamber 10 provided by an embodiment of the present application comprises a first contact module 100, a gas cylinder module 200 and a second contact module 300.

[0038] The first contact module 100 comprises a contact seat 110, a stationary arc contact 120 and a stationary contact 130 arranged on the contact seat 110. In a specific arrangement, the contact seat 110 comprises a bottom wall 111 and a side wall 112 arranged around the profile of the bottom wall 111, and the bottom wall 111 and the side wall 112 enclose a receiving space 113 for receiving the stationary arc contact 120. The stationary arc contact 120 is arranged in parallel with the axial direction of the side wall 112, one end of the stationary arc contact 120 is arranged on the bottom wall 111, and the other end of the stationary arc contact 120 extends beyond the side wall 112. The stationary contact 130 is arranged on the outer periphery of the side wall 112 away from the bottom wall 111, and one end of the stationary contact 130 away from the side wall 112 extends beyond the side wall 112.

[0039] The cylinder module 200 comprises a valve seat 210, a cylinder barrel 220 and a pull rod 230, wherein the valve seat 210 is arranged in the cylinder barrel 220, and the pull rod 230 is arranged in the valve seat 210. In a specific arrangement, the pull rod 230 is connected to an operating mechanism, and the pull rod 230 drives the valve seat 210 and the cylinder barrel 220 to move under the drive of the operating mechanism.

[0040] The second contact module 300 comprises a movable arc contact 310, a movable contact 320 and an elastic member 330. The movable arc contact 310 is arranged on one end of the pull rod 230, and is used for clamping the stationary arc contact 120. The movable contact 320 is sleeved on a first end portion 221 of the cylinder barrel 220 close to the movable arc contact 310, and the movable contact 320, the first end portion 221 and the valve seat 210 enclose an expansion chamber 400, and the movable contact 320 is used for clamping the stationary contact 130. It should be noted that, by arranging the movable arc contact 310 connected to the pull rod 230, the pull rod 230 drives the movable arc contact 310 to separate from the stationary arc contact 120 under the drive of the operating mechanism, and at the same time, the pull rod 230 drives the movable contact 320 sleeved on the cylinder barrel 220 to separate from the stationary contact 130 through the cylinder barrel 220, so as to realize the opening of the self-energy arc-extinguishing chamber 10.

[0041] One end of the elastic member 330 is arranged in the interior of the first end portion 221, and the other end of the elastic member 330 is arranged on the movable contact 320. It should be emphasized that, when the movable arc contact 310 separates from the stationary arc contact 120, a large amount of arc 20 heat is generated, and the arc 20 heat flowing into the expansion chamber 400 drives the elastic member 330 in the expansion chamber 400 to stretch, thereby pulling the movable contact 320 connected to the elastic member 330 to rise along the axial direction of the cylinder barrel 220, expanding the volume of the expansion chamber 400, so that the expansion chamber 400 can accommodate more gas, and the pressure of the expansion chamber 400 is increased, so that even when a large current is broken, the phenomenon of failure to extinguish the arc 20 does not occur.

[0042] The self-energizing arc-extinguishing chamber 10 is provided with the elastic member 330, one end of which is arranged in the first end portion 221, and the other end of which is arranged on the movable contact 320. When the pull rod 230 drives the movable arc contact 310 to separate from the static arc contact 120, a large amount of arc 20 heat will flow into the expansion chamber 400, so as to drive the elastic member 330 in the expansion chamber 400 to be stretched, thereby pulling the movable contact 320 connected with the elastic member 330 to ascend along the axial direction of the cylinder 220, so that the volume of the expansion chamber 400 can change correspondingly according to the arc 20 heat. When breaking a large current, the volume of the expansion chamber 400 can be increased to store more gas, thereby improving the blowing capacity and breaking performance.

[0043] In order to conveniently arrange the elastic member 330 in the first end portion 221, in a preferred embodiment, the valve seat 210 comprises a base 211 arranged on the inner wall of the cylinder 220. In a specific arrangement, the base 211 is arranged vertically on the inner wall of the cylinder 220, so that the base 211 is connected with the end of the elastic member 330 away from the movable contact 320. It should be noted that the valve seat 210 further comprises a connecting cylinder 212 arranged on the base 211. The connecting cylinder 212 is provided for the pull rod 230 to pass through, and the inner wall of the connecting cylinder 212 is connected with the outer wall of the pull rod 230. Specifically, the connecting cylinder 212 extends in the direction towards the movable arc contact 310, and the connecting cylinder 212 also covers part of the movable arc contact 310.

[0044] It should be emphasized that a containing groove can also be arranged on the inner wall of the first end portion 221 of the cylinder 220 to form a platform for mounting the elastic member 330. In a specific arrangement, the containing groove is arranged along the circumferential direction of the inner wall of the first end portion 221. The depth of the containing groove extends along the thickness direction of the cylinder 220. The length of the containing groove extends along the axial direction of the cylinder 220 and is connected with the end of the cylinder 220 close to the first contact module 100, so that the groove bottom wall of the containing groove forms a ring-shaped platform for mounting the elastic member 330.

[0045] In order to conveniently design the movable contact 320, in a preferred embodiment, the movable contact 320 comprises a first cylinder 321, a connecting wall 322 and a second cylinder 323 arranged in sequence. The first cylinder 321 is movably sleeved on the first end portion 221 along the axial direction of the first end portion 221. It should be noted that the first cylinder 321 and the first end portion 221 are directly sleeved without being fixed, so as to facilitate the relative movement therebetween. The connecting wall 322 is connected with the end of the elastic member 330 away from the base 211. In a specific arrangement, the connecting wall 322 is arranged opposite to the base 211. The space between the connecting wall 322 and the base 211 is provided for the elastic member 330 to be arranged along the length direction of the elastic member 330, so as to facilitate the deformation of the elastic member 330. The second cylinder 323 is used for plugging the static contact 130. In a specific arrangement, the radial dimension of the second cylinder 323 is smaller than the radial dimension of the first cylinder 321.

[0046] Through the above arrangement, when the arc 20 heat is generated by the self-energizing arc-extinguishing chamber 10 tripping, the arc 20 heat can be pulled up by the stretched elastic member 330 to pull the moving contact 320 connected with the elastic member 330, so that the volume of the expansion chamber 400 can be changed according to the arc 20 energy, when breaking a large current, the volume of the expansion chamber 400 can be increased to store more gas, thereby improving the blowing capacity and breaking performance.

[0047] In order to make the moving contact 320 closely fit the first end portion 221, in a preferred embodiment, the elastic member 330 is in a stretched state. Through the above arrangement, the initial state of the elastic member 330 arranged between the connecting wall 322 and the base 211 is a stretched state, and the rebound force of the elastic member 330 makes the connecting wall 322 closely fit the first end portion 221, thereby enhancing the stability of the cooperation between the moving contact 320 and the first end portion 221. It should be noted that the initial state of the elastic member 330 is not limited to the above-mentioned stretched state, and the initial state of the elastic member 330 can also be a normal undeformed state or a compressed state, and the initial state of the elastic member 330 is preferably in a stretched state.

[0048] It should be emphasized that, after the arc 20 heat causes the elastic member 330 to be further stretched, thereby increasing the volume of the expansion chamber 400 to accommodate more gas, the subsequent process is combined Figure 4 as shown, Figure 4 The self-energizing arc-extinguishing chamber 10 provided by the present application is shown in the gas flow schematic diagram during tripping, and in some embodiments, the gas in the expansion chamber 400 will be subsequently discharged to extinguish the arc 20. At the same time, the elastic member 330 which is further stretched before loses the arc 20 heat, and the elastic member 330 will timely recover to the initial state under the action of the rebound force, and the elastic member 330 also timely drives the moving contact 320 connected with itself to return to the initial position. In the specific arrangement, the number of the elastic member 330 is multiple, and the multiple elastic members 330 are arranged along the circumference of the inner wall of the first end portion 221, and the specific number of the elastic member 330 can be 2, 3, 4 or more, and the elastic member 330 is preferably a spring.

[0049] In order to prevent the arc 20 heat and gas from leaking into the expansion chamber 400, more specifically, the outer wall of the first end portion 221 is provided with a sealing member 240, and the sealing member 240 also abuts against the inner wall of the first cylinder 321. In the specific arrangement, the outer wall of the first end portion 221 is provided with a mounting groove, and the sealing member 240 is arranged in the mounting groove, and the sealing member 240 is used to seal the gap between the first end portion 221 and the first cylinder 321, and the sealing member 240 is preferably a rubber ring.

[0050] In order to facilitate the clamping of the movable contact 320 to the static contact 130, more specifically, the static contact 130 comprises a butt joint 131 arranged around the outer periphery of the contact seat 110. In a specific arrangement, the butt joint 131 is arranged on the outer periphery of the contact seat 110 away from the bottom wall 111 of the side wall 112. The inner wall of the butt joint 131 is provided with a conductive part 132 for contacting the outer wall of the second cylinder 323. In a specific arrangement, the conductive part 132 is a thin copper sheet, so that when the conductive part 132 is clamped to the outer wall of the second cylinder 323, the conductive part 132 is easily deformed to increase the stability of the connection with the second cylinder 323.

[0051] In order to accelerate the inflow of arc 20 heat and gas into the expansion chamber 400, more specifically, the self-operated arc extinguishing chamber 10 further comprises a nozzle 500, the nozzle 500 comprises a first nozzle 510 and a second nozzle 520 arranged outside the first nozzle 510, wherein the first nozzle 510 and the second nozzle 520 have an air gap 530 therebetween, the first nozzle 510 is arranged on the movable arc contact 310 and connected with the valve seat 210, in a specific arrangement, the first nozzle 510 is connected with the outer wall of the connecting cylinder 212. The outer side of the second nozzle 520 abuts against the inner wall of the second cylinder 323, and the end of the second nozzle 520 away from the second cylinder 323 is slidingly arranged in the contact seat 110. In a specific arrangement, the end of the second nozzle 520 away from the second cylinder 323 is provided with an annular groove 521, and a guide ring is arranged in the annular groove 521, the guide ring abuts against the inner wall of the side wall 112 in the contact seat 110. The static arc contact 120 is inserted into the movable arc contact 310 after passing through the second nozzle 520 and the first nozzle 510. Through the above arrangement, when the movable arc contact 310 and the static arc contact 120 are separated, a large amount of arc 20 heat and gas driven by the arc 20 will enter the expansion chamber 400 through the air gap 530 between the first nozzle 510 and the second nozzle 520, so as to drive the elastic member 330 in the expansion chamber 400 to stretch, thereby changing the volume in the expansion chamber 400 to improve the breaking performance.

[0052] In combination with Figure 5 as shown, Figure 5 The cross-sectional view of the nozzle 500 provided in the present application is shown. In order to strengthen the connection strength between the first nozzle 510 and the second nozzle 520 while facilitating the formation of the air gap 530 therebetween, further, the nozzle 500 further comprises a connecting rod 540, the connecting rod 540 is arranged between the first nozzle 510 and the second nozzle 520, and the connecting rod 540 is used to connect the first nozzle 510 and the second nozzle 520. In a specific arrangement, the number of connecting rods 540 is multiple, and the multiple connecting rods 540 are arranged at intervals on the outer periphery of the first nozzle 510, and the air gap 530 is formed between adjacent two connecting rods 540. It should be noted that the specific number of connecting rods 540 is not limited too much, and can be set according to actual needs.

[0053] The embodiment of the application further provides a circuit breaker, which comprises a trip mechanism and the self-energizing arc extinguishing chamber 10 as described in any of the above embodiments, the trip mechanism is connected with the pull rod 230 in the self-energizing arc extinguishing chamber 10, and the trip mechanism is used to drive the pull rod 230 to move, so that the pull rod 230 can drive the moving arc contact 310 to separate from the static arc contact 120 under the driving of the trip mechanism, and meanwhile, the pull rod 230 also drives the moving contact 320 sleeved on the cylinder 220 to separate from the static contact 130, so as to realize the opening of the self-energizing arc extinguishing chamber 10.

[0054] The circuit breaker described above, by setting one end of the elastic element 330 in the self-energizing arc extinguishing chamber 10 inside the first end portion 221 and the other end of the elastic element 330 on the moving contact 320, when the pull rod 230 drives the moving arc contact 310 to separate from the static arc contact 120, a large amount of arc 20 heat will flow into the expansion chamber 400, so as to drive the elastic element 330 in the expansion chamber 400 to be stretched, thereby pulling the moving contact 320 connected with the elastic element 330 to rise along the axial direction of the cylinder 220, so that the volume of the expansion chamber 400 can be changed according to the arc 20 heat, when breaking a large current, the volume of the expansion chamber 400 can be increased to store more gas, so as to improve the blowing capacity and improve the breaking performance.

[0055] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0056] The above embodiments only express several implementation manners of the application, the description is more specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are within the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A self-energizing arc chute, characterized in that, The self-acting arc extinguishing chamber comprises a first contact module, a cylinder module and a second contact module, wherein: The first contact module comprises a contact seat, a static arc contact and a static contact arranged on the contact seat; The cylinder module comprises a cylinder, a valve seat arranged in the cylinder and a pull rod penetrating the valve seat; The second contact module comprises a moving arc contact, a moving contact and an elastic member, the moving arc contact is arranged on one end of the pull rod and used for clamping the static arc contact, the moving contact is sleeved on a first end of the cylinder close to the moving arc contact, the moving contact and the first end and the valve seat form an expansion chamber, and the moving contact is used for clamping the static contact, one end of the elastic member is arranged in the first end, and the other end of the elastic member is arranged on the moving contact.

2. The self-energy arc-extinguishing chamber according to claim 1, characterized in that The valve seat comprises a base arranged on the inner wall of the cylinder, and the base is connected with one end of the elastic member away from the moving contact.

3. The self-energy arc chute according to claim 2, wherein, The moving contact comprises a first cylinder, a connecting wall and a second cylinder arranged in sequence, the first cylinder is movably sleeved on the first end along the axial direction of the first end, the connecting wall is connected with one end of the elastic member away from the base, and the second cylinder is used for inserting the static contact.

4. The self-energy arc-extinguishing chamber according to claim 1, characterized in that, The elastic member is in a stretched state.

5. The self-energy arc-extinguishing chamber according to claim 3, characterized in that, The outer wall of the first end is provided with a sealing member, and the sealing member also abuts against the inner wall of the first cylinder.

6. The self-energy arc-extinguishing chamber according to claim 3, characterized in that, The static contact comprises a butt joint arranged on the outer periphery of the contact seat, and the inner wall of the butt joint is provided with a conductive member used for contacting the outer wall of the second cylinder.

7. The self-energy arc-extinguishing chamber according to claim 3, characterized in that, The self-acting arc extinguishing chamber further comprises a nozzle, and the nozzle comprises a first nozzle and a second nozzle sleeved on the outside of the first nozzle, wherein: The first nozzle and the second nozzle have an air gap therebetween, the first nozzle is sleeved on the moving arc contact and connected with the valve seat; The outside of the second nozzle abuts against the inner wall of the second cylinder, and one end of the second nozzle away from the second cylinder is slidingly arranged on the contact seat; The static contact penetrates the second nozzle and the first nozzle and is inserted into the moving arc contact.

8. The self-energy arc-extinguishing chamber according to claim 7, characterized in that The nozzle further comprises a connecting rod arranged between the first nozzle and the second nozzle, and the connecting rod is used for connecting the first nozzle and the second nozzle.

9. The self-energy arc chute of claim 8, wherein, The number of the connecting rods is multiple, and the multiple connecting rods are arranged at intervals on the outer periphery of the first nozzle, and the air gap is formed between adjacent two connecting rods.

10. A circuit breaker characterized by, The circuit breaker comprises an operating mechanism and the self-acting arc extinguishing chamber according to any one of claims 1-9, and the operating mechanism is connected with the pull rod in the self-acting arc extinguishing chamber.

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