Non-polar magnetic blow-out structure and circuit breaker

Abstract

The utility model relates to a non-polar magnetic blow-out structure and a circuit breaker having the same. The circuit breaker comprises a static contact (10) and a moving contact (20) matched with the static contact (10), and the non-polar magnetic blow-out structure comprises an arc extinguish chamber and a permanent magnet. Wherein the arc extinguishing chamber (30) is provided with a plurality of arc extinguishing sheets (31), each arc extinguishing sheet (31) extends along the horizontal direction (x) of the non-polar magnetic blow-out structure, and the arc extinguishing sheets (31) are mutually spaced along the height direction (z) of the non-polar magnetic blow-out structure. The permanent magnet is located between the contact point of the static contact (10) and the arc extinguish chamber (30) in the horizontal direction (x).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a non-polarity magnetic blow structure and a circuit breaker with the same. BACKGROUND

[0002] Circuit breakers are widely used in power systems and industrial automation as an electrical protection device. Circuit breakers can quickly cut off the current when an abnormality occurs in the circuit, such as overload or short circuit, to protect the circuit and equipment from damage. One of the main components of a circuit breaker is its moving and stationary contacts, which make contact to allow current to pass through and separate to interrupt the current when it needs to be cut off.

[0003] When the moving and stationary contacts separate, an arc will be generated between the contacts due to the sudden interruption of the current. The arc not only can continue to conduct electricity, but also can cause damage to the components of the circuit breaker. In the case of large current, the arc is more likely to run to the arc extinguishing chamber, however, in the case of small current (125A and below), especially when the distance between the moving and stationary contacts and the arc extinguishing chamber is far, the arc is more likely to stay between the contacts, and the arc burning time is significantly prolonged. This can increase the wear and tear of the contact material, cause the contact to weld, affect the breaking capacity of the circuit breaker, increase the risk of equipment damage and fire, etc.

[0004] The performance test of circuit breakers in small current conditions in the current market has more stringent requirements than the relevant standards. Therefore, it is desirable to improve the performance of circuit breakers in small current conditions, reduce the arc burning time, and reduce the adverse effects of the arc. SUMMARY

[0005] In view of the above-mentioned problems and needs, the present disclosure proposes a non-polarity magnetic blow structure and a circuit breaker with the same, which solves the above-mentioned problems and brings other technical effects due to the adoption of the following technical features.

[0006] In one aspect, the present disclosure proposes a non-polarity magnetic blow structure for a circuit breaker, the circuit breaker comprising a stationary contact and a moving contact cooperating with the stationary contact, characterized in that the non-polarity magnetic blow structure comprises: an arc extinguishing chamber, the arc extinguishing chamber having a plurality of arc extinguishing pieces, wherein each arc extinguishing piece extends along a horizontal direction x of the non-polarity magnetic blow structure, and each arc extinguishing piece is spaced apart from each other along a height direction z of the non-polarity magnetic blow structure; a permanent magnet, the permanent magnet being located between a contact point of the stationary contact and the arc extinguishing chamber in the horizontal direction x; a side magnetic enhancement block (53) located on one side or both sides of the contact point of the stationary contact (10).

[0007] According to a preferred scheme, the side magnetic enhancement block (53) comprises two side magnetic enhancement blocks (53) located on both sides of the contact point of the stationary contact (10).

[0008] According to a preferred solution, the permanent magnets comprise a first permanent magnet and a second permanent magnet, which are spaced apart in the horizontal direction x of the non-polarity magnetic blow structure and oppositely arranged in polarity.

[0009] According to a preferred solution, the height at which the first permanent magnet closer to the static contact is located is higher than the height at which the second permanent magnet closer to the arc-extinguishing chamber is located.

[0010] According to a preferred solution, the non-polarity magnetic blow structure further comprises magnetic enhancement blocks, which comprise at least one of the following: one or more first magnetic enhancement blocks located between the first permanent magnet and the second permanent magnet; one or more second magnetic enhancement blocks located below the contact of the static contact.

[0011] According to a preferred solution, the number of the first magnetic enhancement blocks is two or more, and the height of the first magnetic enhancement block closer to the arc-extinguishing chamber is equal to or lower than the height of the first magnetic enhancement block farther away from the arc-extinguishing chamber.

[0012] According to a preferred solution, the number of the second magnetic enhancement blocks is two or more, and the second magnetic enhancement blocks are arranged to have a consistent height.

[0013] According to a preferred solution, the first permanent magnet is located between the first magnetic enhancement block and the second magnetic enhancement block and is in contact with the adjacent first magnetic enhancement block and the adjacent second magnetic enhancement block.

[0014] According to a preferred solution, the non-polarity magnetic blow structure further comprises a first arc-triggering piece, a first end of which is connected to the static contact, and a second end of which extends below the arc-extinguishing chamber and parallel to the arc-extinguishing piece of the arc-extinguishing chamber.

[0015] According to a preferred solution, the non-polarity magnetic blow structure further comprises a second arc-triggering piece, a first end of which is located at the end of the movable contact in the breaking state, and a second end of which extends above the arc-extinguishing chamber and parallel to the arc-extinguishing piece of the arc-extinguishing chamber.

[0016] The present disclosure also relates to a circuit breaker comprising the non-polarity magnetic blow structure according to any one of the preceding solutions.

[0017] The most preferred embodiments of implementing the present disclosure will be described in more detail below with reference to the accompanying drawings, so that the features and advantages of the present disclosure can be easily understood. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments of the present disclosure will be briefly introduced below. The drawings are merely used to show some embodiments of the present disclosure, and not to limit all embodiments of the present disclosure to them.

[0019] Figure 1A perspective view of the non-polarity magnetic blow structure proposed by the present disclosure is shown.

[0020] Figure 2 A front view of the non-polarity magnetic blow structure proposed by the present disclosure is shown.

[0021] Figure 3 A perspective view of the non-polarity magnetic blow structure proposed by the present disclosure is shown from another angle.

[0022] Figure 4 A schematic arrangement of the permanent magnets and the magnetic enhancement blocks of the non-polarity magnetic blow structure proposed by the present disclosure is shown.

[0023] Figure 5 A principle diagram of the arc force is shown.

[0024] List of reference signs

[0025] 10 stationary contact

[0026] 20 movable contact

[0027] 30 arc chamber

[0028] 31 arc sheet

[0029] 41 first permanent magnet

[0030] 42 second permanent magnet

[0031] 51 first magnetic enhancement block

[0032] 52 second magnetic enhancement block

[0033] 53 side magnetic enhancement block

[0034] 60 first arc initiation sheet

[0035] 61 first end of the first arc initiation sheet

[0036] 62 second end of the first arc initiation sheet

[0037] 63 middle section of the first arc initiation sheet

[0038] 70 second arc initiation sheet

[0039] 71 first end of the second arc initiation sheet

[0040] 72 second end of the second arc initiation sheet

[0041] 73 middle section of the second arc initiation sheet DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings of the embodiments of the present disclosure. The same reference signs in the drawings represent the same components. It should be noted that the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0043] Compared with the embodiments shown in the drawings, the feasible implementation solutions within the protection scope of the present disclosure can have fewer components, have other components not shown in the drawings, have different components, have components arranged differently, or have components connected differently, etc. In addition, two or more components in the drawings can be implemented in a single component, or a single component shown in the drawings can be implemented as a plurality of separate components.

[0044] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meanings understood by those of ordinary skill in the art to which the present disclosure belongs. The terms "first", "second", and similar terms used in the specification and claims of the present patent application do not represent any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms "one" or "a" and similar terms do not necessarily represent a quantity limitation. The terms "including", "containing", and similar terms mean that the elements or objects before the term encompass the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like only represent relative positional relationships, which can change when the absolute position of the described object changes.

[0045] The present disclosure relates to a poleless magnetic blow structure and a circuit breaker having the poleless magnetic blow structure.

[0046] The non-polarity magnetic blowing structure proposed by the present disclosure can be applied to various circuit breakers, which include a static contact 10 as a core component and a moving contact 20 cooperating with the static contact 10. The static contact 10 and the moving contact 20 work together to control the on-off of the circuit. When the on-off occurs, the static contact 10 is fixed, while the moving contact 20 moves relative to the static contact 10, for example, the moving contact 20 can rotate around its own rotation axis to engage or leave the static contact 10, thereby realizing the connection or disconnection of the circuit. When the moving contact 20 is separated from the static contact 10, an arc is easily generated between the two, which can cause damage to the contacts and other components of the circuit breaker. In the case of small current 125A and below, especially when the distance between the static contact 10 and the arc extinguishing chamber 30 is far, the arc problem is more serious, because the arc is more likely to stay between the static contact 10 and the moving contact 20, and the arc burning time is longer. The present disclosure uses a non-polarity magnetic blowing scheme to solve this problem, by adding permanent magnets and magnetic blocks to promote the arc to move away from the contact point of the static contact 10 and towards the arc extinguishing chamber 30, effectively blowing the small current arc root out of the static contact point, reducing the small current arc burning time.

[0047] The preferred embodiments of the non-polarity magnetic blowing structure of the present disclosure are described below with reference to the accompanying drawings. Among them, Figure 1 、 Figure 2 、 Figure 3 The schematic diagrams of exemplary embodiments of the non-polarity magnetic blowing structure proposed by the present disclosure are shown from different perspectives, respectively, and Figure 4 The schematic arrangement of permanent magnets and magnetic blocks is shown.

[0048] For the sake of clarity, the non-polarity magnetic blowing structure is described with reference to the coordinate system of Figure 2 . Among them, the x direction represents the horizontal direction of the non-polarity magnetic blowing structure, the y direction is the width direction of the non-polarity magnetic blowing structure, and the z direction is the height direction of the non-polarity magnetic blowing structure. It can be understood that in the actual use of the non-polarity magnetic blowing structure and the circuit breaker, the horizontal direction x is not necessarily parallel to the ground.

[0049] The non-polarity magnetic blowing structure of the present disclosure includes an arc extinguishing chamber 30. The arc extinguishing chamber 30 has a plurality of arc extinguishing pieces 31, each of which can have the same or substantially the same size and shape. Among them, each arc extinguishing piece 31 extends along the horizontal direction x of the non-polarity magnetic blowing structure, and each arc extinguishing piece 31 is spaced apart from each other along the height direction z of the non-polarity magnetic blowing structure. The plurality of arc extinguishing pieces 31 are preferably uniformly spaced apart from each other. The arc extinguishing chamber 30 can include a first insulating side plate and a second insulating side plate arranged side by side and extending between the front end and the rear end thereof, so as to hold the plurality of arc extinguishing pieces 31 by the first insulating side plate and the second insulating side plate. The arc extinguishing chamber 30 has a front end close to the arc occurrence area and a rear end away from the arc occurrence area, and the arc can move along the arc extinguishing chamber 30 from the front end to the rear end. Figure 2The direction of the middle arrow is from the front end of the arc-extinguishing chamber 30 into the interior of the arc-extinguishing chamber 30. Among them, the non-polarity magnetic blow structure is spaced apart from the contact point of the static contact 10 of the circuit breaker by a certain distance in the horizontal direction x.

[0050] In order to promote the arc generated between the moving contact 20 and the static contact 10 to move away from the contact point / static silver point of the static contact 10 and move towards the arc-extinguishing chamber 30, reduce the small current arc burning time, the non-polarity magnetic blow structure of the present disclosure is also provided with a permanent magnet located between the contact point of the static contact 10 and the arc-extinguishing chamber 30 in the horizontal direction x. Although two permanent magnets are provided in the preferred embodiment of the drawings, in an embodiment not shown, there can be only one permanent magnet located between the contact point of the static contact 10 and the arc-extinguishing chamber 30.

[0051] In addition, the non-polarity magnetic blow structure also has one or more side magnetic enhancement blocks 53 located on one side or both sides of the static contact 10, preferably, as shown in Figure 1 The non-polarity magnetic blow structure includes two side magnetic enhancement blocks 53 located on both sides of the contact point of the static contact 10. Preferably, the side magnetic enhancement block 53 is connected to the static contact 10 and the second magnetic enhancement block 52.

[0052] Preferably, as shown in the drawings, a first permanent magnet 41 and a second permanent magnet 42 are provided, which are spaced apart in the horizontal direction x of the non-polarity magnetic blow structure and arranged with opposite polarities. Among them, "arranged with opposite polarities" means that the two permanent magnets need to be arranged in a state of attracting each other with different polarities. Among them, Figure 4 Two possible polarity arrangements are shown: the first arrangement without brackets and the second arrangement in brackets, both of which can form the magnetic induction lines shown by the dashed line.

[0053] By arranging the first permanent magnet 41 and the second permanent magnet 42 in this way, as shown in Figure 2 and 4 The magnetic induction lines shown by the dashed line can be formed for cooperating with the side magnetic enhancement block 53 to blow the arc towards the arc-extinguishing chamber, as described below. It should be noted that in the case of having only one permanent magnet, it can also form a ring-shaped magnetic induction line and cooperate with the side magnetic enhancement block to achieve the purpose of moving the arc.

[0054] Reference is made to Figure 5, shows the principle of solving the problem of small current difficult to enter the arc-extinguishing chamber by adopting the non-polarity magnetic blow scheme. Among them, the dashed arrow represents the direction of the arc current, and the solid arrow represents the magnetic induction lines 1, 2, 3 formed by the permanent magnet and the side magnetic shunt 53. According to the left-hand rule, the force of the magnetic induction line 1 on the arc will make the arc deflect in the direction towards the paper (the same direction as the magnetic induction line 2). After the arc deflects, the magnetic induction line 2 will generate a force approximately to the left of the arc, that is, a magnetic blow force towards the direction of the arc-extinguishing chamber, so as to promote the arc to enter the arc-extinguishing chamber 30 faster. In the arc-extinguishing chamber 30, the arc will be divided, cooled and eventually extinguished by the designed arc-extinguishing grid to reduce the ablation of the arc to the contact and improve the service life and reliability of the circuit breaker. Figure 5 Only one example of the direction of the current and the direction of the magnetic induction line is shown. It can be understood that no matter whether the direction of the magnetic induction line is reversed or the direction of the arc current is reversed, the arc current will first deflect and then be subjected to a magnetic blow force towards the direction of the arc-extinguishing chamber, so as to promote the arc to enter the arc-extinguishing chamber faster.

[0055] Preferably, as shown in the figure, the first permanent magnet 41 and the second permanent magnet 42 are not arranged at the same height, but the height at which the first permanent magnet 41 closer to the static contact 10 is higher than the height at which the second permanent magnet 42 closer to the arc-extinguishing chamber 30 is. Thus, it is more conducive to forming Figure 2 and 4 the magnetic field lines shown by the dashed lines in the middle.

[0056] Among them, the size of the permanent magnet is not limited by the present disclosure, but preferably, the size of the permanent magnet in the width direction y is greater than or equal to the size of the middle section 73 of the first arc guide plate 60 and the second arc guide plate 70 in the width direction y, which will be introduced below.

[0057] Preferably, the non-polarity magnetic blow structure further comprises additional magnetic shunts. These additional magnetic shunts can act as a medium for guiding the magnetic induction lines of the permanent magnet and enhance the guiding effect of the magnetic induction lines on the arc.

[0058] In principle, the additional magnetic shunts can include at least one of the following: one or more first magnetic shunts 51 located between the first permanent magnet 41 and the second permanent magnet 42; one or more second magnetic shunts 52 located below the static contact 10. In the preferred embodiment shown in the figure, the magnetic shunts include both the first magnetic shunts 51 and the second magnetic shunts 52. In other embodiments not shown, only one of the first magnetic shunts 51 and the second magnetic shunts 52 can be present. In addition, additional magnetic shunts not shown located on the left side of the first permanent magnet 41 can also be included.

[0059] The first magnetic concentrating blocks 51 are located between the first permanent magnet 41 and the second permanent magnet 42, and preferably, the first permanent magnet 41 and the second permanent magnet 42 are respectively in contact with the adjacent first magnetic concentrating blocks 51. Further preferably, the adjacent first magnetic concentrating blocks 51 are in contact with each other.

[0060] The number of the first magnetic concentrating blocks 51 is preferably two or more, so as to effectively concentrate and guide the magnetic field lines between the first permanent magnet 41 and the second permanent magnet 42.

[0061] Preferably, as shown in the drawings, each first magnetic concentrating block 51 is not arranged in a flush manner in the height direction z, but is generally arranged to be lower closer to the arc-extinguishing chamber 30. In other words, the height of the first magnetic concentrating block 51 closer to the arc-extinguishing chamber 30 in the horizontal direction x is equal to or lower than the height of the first magnetic concentrating block 51 farther away from the arc-extinguishing chamber 30. By such a non-flush inclined arrangement, it is more conducive to form magnetic field lines that can effectively extinguish arcs.

[0062] The second magnetic concentrating blocks 52 are located below the contact of the stationary contact 10, and preferably, are in contact with the bottom surface of the stationary contact 10. The number of the second magnetic concentrating blocks 52 is preferably two or more. Preferably, the adjacent magnetic concentrating blocks 52 are in contact with each other. Further preferably, each second magnetic concentrating block 52 is arranged to have a uniform height, so as to more easily contact the bottom plane of the stationary contact 10. In the preferred embodiment shown in the drawings, the second permanent magnet 42 is in contact with the second magnetic concentrating block 52 closest to the arc-extinguishing chamber 30 among the second magnetic concentrating blocks 52.

[0063] The first magnetic concentrating blocks 51 and the second magnetic concentrating blocks 52 are preferably in a sheet structure or a relatively thin block structure, but are not limited thereto. In this disclosure, the size of the magnetic concentrating blocks is not limited, but preferably, the size of the magnetic concentrating blocks in the width direction y is greater than or equal to the size of the intermediate section 73 of the first arc striking sheet 60 and the second arc striking sheet 70 in the width direction y, which will be described later. In addition, each magnetic concentrating block and each permanent magnet can have the same size.

[0064] The magnetic concentrating blocks can be formed of a ferromagnetic material, have high magnetic permeability, and can effectively concentrate and guide the magnetic field lines, thereby enhancing the magnetic field force acting on the arc.

[0065] Preferably, the non-polarity magnetic blow structure further comprises a first arc-attraction piece 60 and a second arc-attraction piece 70. The first arc-attraction piece 60 can have a first end 61, a second end 62 and an intermediate section 63 therebetween, wherein the first end 61 of the first arc-attraction piece 60 is connected to the stationary contact 10, in particular, near the contact point of the stationary contact 10. The second end 62 of the first arc-attraction piece 60 extends below the arc-extinguishing chamber 30 and parallel to the arc-extinguishing piece 31 of the arc-extinguishing chamber 30. The intermediate section 63 of the first arc-attraction piece 60 is arranged obliquely to the horizontal direction x. The first arc-attraction piece 60 thus arranged can effectively guide the arc root at the contact point of the stationary contact 10 to the arc-extinguishing chamber 30.

[0066] The second arc-attraction piece 70 can have a first end 71, a second end 72 and an intermediate section 73 therebetween, wherein the first end 71 of the second arc-attraction piece 70 is located at the end of the movable contact 20 in the breaking state, without the need to contact the movable contact 20. The second end 72 of the second arc-attraction piece 70 extends above the arc-extinguishing chamber 30 and parallel to the arc-extinguishing piece 31 of the arc-extinguishing chamber 30. The intermediate section 73 of the second arc-attraction piece 70 is arranged obliquely to the horizontal direction x. The second arc-attraction piece 70 is conducive to guiding the arc root at the contact point of the movable contact 20 to the arc-extinguishing chamber 30.

[0067] The first arc-attraction piece 60 and the second arc-attraction piece 70 can have similar structures and are arranged substantially mirror-symmetrically (but not completely mirror-symmetrically).

[0068] With such first arc-attraction piece 60 and second arc-attraction piece 70, not only is it conducive to guiding the arc towards the arc-extinguishing chamber 30, but also can elongate the arc, thereby improving the arc-extinguishing efficiency.

[0069] Preferably, the second end 62 of the first arc-attraction piece 60 and the second end 72 of the second arc-attraction piece 70 are both in the form of a piece, can have similar sizes to the arc-extinguishing piece 31 of the arc-extinguishing chamber 30, and are arranged parallel to the arc-extinguishing piece 31 of the arc-extinguishing chamber 30.

[0070] The cooperation of the first arc-attraction piece 60 and the second arc-attraction piece 70 with the permanent magnet and the magnetic enhancer described above can effectively make the arc leave the contact point of the stationary contact and move towards the arc-extinguishing chamber even in the case of small current, can effectively reduce the arc burning time under small current, reduce the wear and loss of the contact material, improve the performance of the circuit breaker, reduce the risk of damage and fire, etc.

[0071] The exemplary implementation of the scheme proposed by the present disclosure is described in detail above with reference to the preferred embodiments, however, it can be understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments, and various technical features and structures proposed by the present disclosure can be combined without departing from the concept of the present disclosure, and the protection scope of the present disclosure is determined by the appended claims.

Claims

1. A non-polar magnetic blow structure for a circuit breaker, said circuit breaker comprising a stationary contact (10) and a movable contact (20) cooperating with said stationary contact (10), characterized in that, The non-polarity magnetic blow structure comprises: An arc extinguishing chamber (30) having a plurality of arc extinguishing pieces (31), wherein each arc extinguishing piece (31) extends along a horizontal direction (x) of the non-polarity magnetic blow structure, and each arc extinguishing piece (31) is spaced apart from each other along a height direction (z) of the non-polarity magnetic blow structure; A permanent magnet located between the contact of the stationary contact (10) and the arc extinguishing chamber (30) in the horizontal direction (x); A side magnetic enhancement block (53) located on one side or both sides of the contact of the stationary contact (10).

2. The non-polarity magnetic blow structure according to claim 1, wherein The side magnetic enhancement block (53) comprises two side magnetic enhancement blocks (53) located on both sides of the contact of the stationary contact (10).

3. The non-polarity magnetic blow structure according to claim 1, wherein The permanent magnet comprises a first permanent magnet (41) and a second permanent magnet (42), the first permanent magnet (41) and the second permanent magnet (42) are spaced apart in the horizontal direction (x) of the non-polarity magnetic blow structure, and are arranged with opposite polarities.

4. The non-polarity magnetic blow structure according to claim 3, wherein The height at which the first permanent magnet (41) closer to the stationary contact (10) is located is higher than the height at which the second permanent magnet (42) closer to the arc extinguishing chamber (30) is located.

5. The non-polarity magnetic blow structure according to claim 3, wherein The non-polarity magnetic blow structure further comprises a magnetic enhancement block, the magnetic enhancement block comprises at least one of: One or more first magnetic enhancement blocks (51) located between the first permanent magnet (41) and the second permanent magnet (42); One or more second magnetic enhancement blocks (52) located below the contact of the stationary contact (10).

6. The non-polarity magnetic blow structure according to claim 5, wherein The number of the first magnetic enhancement blocks (51) is two or more, and the height of the first magnetic enhancement block (51) closer to the arc extinguishing chamber (30) is equal to or lower than the height of the first magnetic enhancement block (51) farther away from the arc extinguishing chamber (30).

7. The non-polarity magnetic blow structure according to claim 5, wherein The number of the second magnetic enhancement blocks (52) is two or more, and the second magnetic enhancement blocks (52) are arranged with consistent heights.

8. The non-polarity magnetic blow structure according to claim 5, wherein The first permanent magnet (41) is located between the first magnetic enhancement block (51) and the second magnetic enhancement block (52) and is attached to the adjacent first magnetic enhancement block (51) and the adjacent second magnetic enhancement block (52).

9. The non-polarity magnetic blow structure according to any one of claims 1-8, wherein The non-polarity magnetic blow structure further comprises a first arc guiding piece (60), a first end (61) of the first arc guiding piece (60) is connected to the stationary contact (10), a second end (62) of the first arc guiding piece (60) extends below the arc extinguishing chamber (30) and parallel to the arc extinguishing pieces (31) of the arc extinguishing chamber (30).

10. The non-polarity magnetic blow structure according to any one of claims 1-8, wherein The non-polarity magnetic blow structure further comprises a second arc striking piece (70), a first end (71) of the second arc striking piece (70) is located at the end of the movable contact (20) in the breaking state, and a second end (72) of the second arc striking piece (70) extends above the arc extinguishing chamber (30) and is parallel to the arc extinguishing piece (31) of the arc extinguishing chamber (30).

11. A circuit breaker comprising the non-polarity magnetic blow structure according to any one of claims 1-10.

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