Moving contact system and circuit breaker

Abstract

The utility model provides a moving contact system and a circuit breaker, and belongs to the technical field of circuit breakers. The moving contact system comprises a supporting piece, a moving contact, a first rotating shaft, a limiting shaft and a limiting piece. The moving contact is rotatably connected with the support member through the first rotating shaft. The limiting shaft is arranged on the moving contact and is parallel to the first rotating shaft. The limiting piece is arranged on the supporting piece and provided with a first limiting groove and a second limiting groove. The moving contact has a connection state and a repulsion state. In a connection state, the moving contact is in contact with the static contact, and the limiting shaft is clamped in the first limiting groove. And in the repulsion state, the moving contact is separated from the static contact, and the limiting shaft is clamped in the second limiting groove. The limiting shaft is clamped in the second limiting groove in the repulsion state, so that the moving contact can be kept in the repulsion state and cannot be in contact with the static contact again due to falling. Therefore, the breaking capacity of the circuit breaker is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of circuit breakers, and in particular to a moving contact system and a circuit breaker. Background Art

[0002] A circuit breaker is a switching device used to protect the safety of a circuit. The circuit breaker includes a moving contact and a stationary contact, which are connected in the circuit. The moving contact has a connected state and a disconnected state. In the connected state, the moving contact contacts the stationary contact, and the circuit breaker conducts the circuit. In the disconnected state, the moving contact separates from the stationary contact, and the circuit breaker disconnects the circuit.

[0003] In practical applications, when a circuit is short-circuited or overloaded, a large current appears in the circuit. Under the action of electromagnetic force, the moving contact switches from a connected state to a repelled state, and the moving contact and the static contact separate.

[0004] However, the moving contact will fall again after being pushed away, which will cause the moving contact and the static contact to contact again, reducing the reliability of the circuit breaker. Utility Model Content

[0005] The present disclosure provides a moving contact system and a circuit breaker, which can solve the technical problems existing in the related art. The technical solutions of the moving contact system and the circuit breaker are as follows.

[0006] In a first aspect, the present disclosure provides a moving contact system. The moving contact system comprises a support member, a moving contact, a first rotating shaft, a limiting shaft and a limiting member;

[0007] The moving contact is rotatably connected to the support member via the first rotating shaft;

[0008] The limiting shaft is arranged on the moving contact and is parallel to the first rotating shaft;

[0009] The limiting member is arranged on the supporting member, and the limiting member has a first limiting groove and a second limiting groove;

[0010] The moving contact has a connected state and a repelled state. In the connected state, the moving contact contacts the stationary contact, and the limit shaft is stuck in the first limit groove. In the repelled state, the moving contact is separated from the stationary contact, and the limit shaft is stuck in the second limit groove.

[0011] In a possible implementation, the moving contact system further includes a second rotating shaft and an elastic member;

[0012] The limiting member is rotatably connected to the supporting member via the second rotating shaft, and the second rotating shaft is parallel to the first rotating shaft;

[0013] The elastic member applies a force to the limit member so that the limit member rotates toward the moving contact, and in the connected state, the limit member applies a force to the moving contact through the limit axis so that the moving contact rotates toward the static contact, and in the repelled state, the limit member applies a force to the moving contact through the limit axis so that the moving contact rotates away from the static contact.

[0014] In a possible implementation, on a reference section perpendicular to the first rotation axis:

[0015] In the connected state, if the first tangent line passes through the center point of the second rotating shaft and is tangent to the first limiting groove at the first tangent point, and if the first force reference line is perpendicular to the first tangent line and passes through the first tangent point, then the first force reference line is located between the center point of the first rotating shaft and the first end of the moving contact;

[0016] In the repelling state, if the second tangent passes through the center point of the second rotating shaft and is tangent to the second limit groove at the second tangent point, and if the second force reference line is perpendicular to the second tangent and passes through the second tangent point, then the second force reference line is located between the center point of the first rotating shaft and the second end of the moving contact.

[0017] In a possible implementation manner, the moving contact point of the moving contact is located at the second end of the moving contact.

[0018] In a possible implementation, on a reference section perpendicular to the first rotation axis, a first connecting line is set to pass through a first center point of the first rotation axis and a second center point of the limit axis, and a second connecting line is set to pass through the second center point of the limit axis and a third center point of the second rotation axis;

[0019] In the connected state, the angle between the first connection line and the second connection line is a first angle, and in the disconnected state, the angle between the first connection line and the second connection line is a second angle;

[0020] Among them, one of the first angle and the second angle is an acute angle, and the other is an obtuse angle.

[0021] In a possible implementation manner, the first angle is an acute angle, and the second angle is an obtuse angle.

[0022] In a possible implementation, the limiting member includes a connecting plate and two limiting plates, the two limiting plates are opposite to each other and connected by the connecting plate, and the two limiting plates both have the first limiting groove and the second limiting groove;

[0023] The limiting shaft passes through the moving contact, and two ends of the limiting shaft are respectively matched with the first limiting groove or the second limiting groove of the two limiting plates.

[0024] In a possible implementation, the limiting shaft includes a first shaft segment, two second shaft segments and two third shaft segments;

[0025] The two second shaft segments are respectively connected to both ends of the first shaft segment, and the two third shaft segments are respectively connected to ends of the two second shaft segments away from the first shaft segment;

[0026] The outer diameters of the first shaft segment and the third shaft segment are both larger than the outer diameter of the second shaft segment, and the outer diameter of the first shaft segment is larger than or equal to the outer diameter of the third shaft segment;

[0027] The first shaft section passes through the moving contact, the two second shaft sections respectively cooperate with the first limiting grooves or the second limiting grooves of the two limiting plates, and the two third shaft sections are respectively located on the outer sides of the two limiting plates.

[0028] In a possible implementation, the two limiting plates are both provided with a shaft hole, and the two shaft holes are opposite to each other;

[0029] The second rotating shaft passes through the two rotating shaft holes, and both ends of the second rotating shaft are rotatably connected to the supporting member.

[0030] In a possible implementation, the elastic member is a double torsion spring, and the elastic member includes a common torsion arm and two branch torsion arms;

[0031] The common torsion arm abuts against the support member;

[0032] The two branch torsion arms are located on both sides of the moving contact and respectively abut against the two limit plates.

[0033] In a possible implementation, each of the limiting plates has an elastic member abutting portion protruding away from the other limiting plate;

[0034] The two elastic member abutment portions both have grooves, and the two branch torsion arms extend into the two grooves respectively.

[0035] In a second aspect, the present disclosure provides a circuit breaker, wherein the circuit breaker comprises a moving contact system as described in any one of the first aspects.

[0036] The technical solution provided by the present disclosure includes at least the following beneficial effects.

[0037] The moving contact system provided by the present disclosure includes a limit shaft and a limit member, wherein the limit shaft is arranged on the moving contact, and the limit member includes a first limit groove and a second limit groove. In the connected state, the moving contact contacts the static contact, and the limit shaft is stuck in the first limit groove. In the repelled state, the moving contact is separated from the static contact, and the limit shaft is stuck in the second limit groove. In this way, when the moving contact is switched to the repelled state, since the limit shaft will be stuck in the second limit groove, the moving contact will be limited in the repelled state and will not fall. It can be seen that after the moving contact is repelled, the moving contact system disconnects the circuit, and the circuit will not be turned on again. The moving contact system provided by the present disclosure can quickly cut off the faulty circuit, has good breaking capacity, and is highly reliable.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, are used to explain the principles of the present disclosure. In the drawings:

[0040] Figure 1 It is a two-dimensional schematic diagram of a moving contact switching from a connected state to a repelled state provided by an embodiment of the present disclosure;

[0041] Figure 2 is a schematic diagram of a moving contact system provided by an embodiment of the present disclosure;

[0042] Figure 3 is an exploded view of a moving contact system provided by an embodiment of the present disclosure;

[0043] Figure 4 It is a three-dimensional schematic diagram of a moving contact switching from a connected state to a repelled state provided by an embodiment of the present disclosure;

[0044] Figure 5 It is a two-dimensional schematic diagram of a moving contact switching from a connected state to a repelled state provided by an embodiment of the present disclosure;

[0045] Figure 6 It is a two-dimensional schematic diagram of a moving contact switching from a connected state to a repelled state provided by an embodiment of the present disclosure;

[0046] Figure 7 It is a two-dimensional schematic diagram of a moving contact switching from a connected state to a repelled state provided by an embodiment of the present disclosure;

[0047] Figure 8 It is a two-dimensional schematic diagram of a moving contact switching from a connected state to a repelled state provided by an embodiment of the present disclosure;

[0048] Fig. 9is a cross-sectional view of a moving contact system provided by an embodiment of the present disclosure;

[0049] Fig.10 It is a schematic diagram of a moving contact, a first rotating shaft, a limiting shaft, a limiting member, and a second rotating shaft provided in an embodiment of the present disclosure;

[0050] Fig.11 is a schematic diagram of a limit axis provided in an embodiment of the present disclosure;

[0051] Fig.12 It is a schematic diagram of a support member, a limit member and a second rotating shaft provided in an embodiment of the present disclosure.

[0052] Legend

[0053] 1. Moving contact system, 2. Stationary contact, 20. Stationary contact;

[0054] 11. Support member, 110. Mounting cavity, 111. First rotating shaft mounting groove;

[0055] 12, moving contact, 12a, first end, 12b, second end, 120, moving contact point;

[0056] 13. First rotating shaft;

[0057] 14, limiting shaft, 141, first shaft section, 142, second shaft section, 143, third shaft section;

[0058] 15. a limiting member, 151. a limiting plate, 1511. a first limiting groove, 1512. a second limiting groove, 1513. a rotating shaft hole, 152. a connecting plate, 153. an elastic member abutting portion, 154. a groove;

[0059] 16. Second rotating shaft;

[0060] 17, elastic member, 171, common torsion arm, 172, branch torsion arm;

[0061] a, first tangent line, b, first force reference line, c, first baseline;

[0062] d, second tangent line, e, second force reference line, f, second baseline;

[0063] X, first center point, Y, second center point, Z, third center point;

[0064] XY, the first connection line, YZ, the second connection line.

[0065] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0066] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0067] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0068] A circuit breaker is a switching device used to protect circuit safety. The circuit breaker is connected to the circuit and can keep the circuit open when the circuit is normal, and disconnect the circuit when the circuit is short-circuited or overloaded.

[0069] like Figure 1 As shown, the circuit breaker includes a moving contact system 1 and a stationary contact 2, and the moving contact system 1 includes a moving contact 12. The moving contact 12 has a connected state and a disconnected state. Figure 1 As shown in the upper part, in the connected state, the moving contact 12 contacts the stationary contact 2, and the circuit breaker conducts the circuit. Figure 1 As shown in the lower part, in the opened state, the moving contact 12 is separated from the stationary contact 2, and the circuit breaker disconnects the circuit.

[0070] In actual application, when the circuit is short-circuited or overloaded, a large current appears in the circuit. Under the action of electromagnetic force, the moving contact 12 switches from the connected state to the repelled state, and the moving contact 12 and the stationary contact 2 are separated. After the moving contact 12 is separated from the stationary contact 2, the release in the circuit breaker will start to work, and after a certain period of time, the release will trip and disconnect the circuit.

[0071] However, the moving contact 12 will fall again after being pushed away, which will cause the moving contact 12 and the static contact 2 to re-contact. At this time, if the release has not completed the tripping, the circuit breaker will re-open the circuit (which may cause a reignition problem and damage the circuit breaker) until the release is completed. It can be seen that the circuit breaker in the related art can only completely disconnect the circuit after the release of the circuit breaker is completed. This makes the circuit breaker's breaking speed slow and the circuit breaker's reliability poor.

[0072] In view of the above technical problems, the present disclosure provides a moving contact system 1. Figure 2-Figure 4 As shown, the moving contact system 1 includes a support member 11, a moving contact 12, a first rotating shaft 13, a limiting shaft 14 and a limiting member 15. The moving contact 12 is rotatably connected to the support member 11 through the first rotating shaft 13. The limiting shaft 14 is arranged on the moving contact 12 and is parallel to the first rotating shaft 13. The limiting member 15 is arranged on the support member 11, and the limiting member 15 has a first limiting groove 1511 and a second limiting groove 1512. Figure 4 As shown, the moving contact 12 has a connected state and a disconnected state. Figure 4 As shown in the upper part, in the connected state, the moving contact 12 is in contact with the stationary contact 2, and the limiting shaft 14 is stuck in the first limiting groove 1511. Figure 4 As shown in the lower part, in the repelling state, the moving contact 12 is separated from the static contact 2, and the limiting shaft 14 is stuck in the second limiting groove 1512.

[0073] Among them, Figure 1 , Figure 2 and Figure 4 As shown, the stationary contact 2 has a stationary contact point 20 , and the movable contact 12 has a movable contact point 120 , and the stationary contact point 20 is in contact with the movable contact point 120 .

[0074] The technical solution provided by the embodiment of the present disclosure is that the moving contact system 1 includes a limit shaft 14 and a limit member 15, the limit shaft 14 is arranged on the moving contact 12, and the limit member 15 includes a first limit groove 1511 and a second limit groove 1512. Moreover, in the connected state, the limit shaft 14 is stuck in the first limit groove 1511, and in the repelled state, the limit shaft 14 is stuck in the second limit groove 1512. In this way, the moving contact 12 is relatively stable in both the connected state and the repelled state. Moreover, when the moving contact 12 is switched to the repelled state, since the limit shaft 14 will be stuck in the second limit groove 1512, the moving contact 12 will remain in the repelled state and will not fall. In this way, regardless of whether the releaser completes the tripping action, the circuit where the moving contact system is located will no longer be conductive.

[0075] It can be seen that after the moving contact 12 of the moving contact system 1 provided in the embodiment of the present disclosure is switched to the repelled state, the circuit breaker completely disconnects the circuit, regardless of whether the release completes the tripping action. In this way, the circuit breaker using the moving contact system 1 provided in the embodiment of the present disclosure can quickly cut off the fault circuit, and the circuit breaker has a good breaking capacity and high reliability.

[0076] To further improve the stability of the moving contact 12 in the connected state and the disconnected state, in some examples, such as Figure 3-Figure 8 As shown, the moving contact system 1 further includes a second rotating shaft 16 and an elastic member 17. The stopper 15 is rotatably connected to the support member 11 via the second rotating shaft 16, and the second rotating shaft 16 is parallel to the first rotating shaft 13. The elastic member 17 applies a force to the stopper 15 to make the stopper 15 rotate toward the moving contact 12 (or the first rotating shaft 13). The rotation trend of the stopper 15 is as shown in FIG. Figure 5-Figure 8 As shown in the direction of the arrow around the second rotation axis 16.

[0077] like Figure 5 and Figure 6 As shown in the upper part of , in the connected state, the limiter 15 applies a force to the moving contact 12 through the limiter shaft 14 to rotate the moving contact 12 toward the stationary contact 2. The direction of the force is the same as the direction indicated by the first force reference line b. The rotation trend of the moving contact 12 is shown in the direction of the arrow around the first rotating shaft 13. The movement trend of the moving contact 120 is shown in the direction of the arrow at the moving contact 120. It can be seen that under the action of the elastic member 17 and the limiter 15, the moving contact 12 has a tendency to rotate toward the stationary contact 2, which makes the moving contact 120 close to the stationary contact 20.

[0078] like Figure 5 and Figure 6 As shown in the lower part of , in the repelling state, the limit member 15 applies a force to the moving contact 12 through the limit shaft 14 to rotate the moving contact 12 away from the static contact 2. The direction of the force is the same as the direction indicated by the second force reference line e. The rotation trend of the moving contact 12 is shown in the direction of the arrow around the first rotating shaft 13. The movement trend of the moving contact 120 is shown in the direction of the arrow at the moving contact 120. It can be seen that under the action of the elastic member 17 and the limit member 15, the moving contact 12 has a tendency to rotate away from the static contact 2, so the moving contact 120 is less likely to fall, and the reliability of the moving contact system 1 is higher.

[0079] To achieve the above functions, in some examples, such as Figure 5 and Figure 6 As shown, on the reference section perpendicular to the first rotation axis 13, as Figure 5 and Figure 6As shown in the upper part, in the connected state, the first tangent a passes through the center point of the second rotating shaft 16 and is tangent to the first limiting groove 1511 at the first tangent point (or is understood to be tangent to the limiting shaft 14). The first force reference line b is perpendicular to the first tangent a and passes through the first tangent point. Then the first force reference line b is located between the center point of the first rotating shaft 13 and the first end 12a of the moving contact 12.

[0080] The direction indicated by the first force reference line b is the direction of the force applied by the limit member 15 to the moving contact 12 through the limit shaft 14. Under the action of this force, the moving contact 12 tends to rotate toward the stationary contact 2. The first force reference line b is located between the center point of the first rotating shaft 13 and the first end 12a of the moving contact 12. It can also be described as that the first force reference line b is located between the first reference line c and the first end 12a of the moving contact 12. The first reference line c is perpendicular to the first tangent a and passes through the center point of the first rotating shaft 13.

[0081] like Figure 5 and Figure 6 As shown in the lower part, in the repelling state, the second tangent line d passes through the center point of the second rotating shaft 16 and is tangent to the second limiting groove 1512 at the second tangent point (or understood as tangent to the limiting shaft 14). The second force reference line e is perpendicular to the second tangent line d and passes through the second tangent point. Then the second force reference line e is located between the center point of the first rotating shaft 13 and the second end 12b of the moving contact 12. The first end 12a and the second end 12b are opposite ends of the moving contact 12.

[0082] The direction indicated by the second force reference line e is the direction of the force applied by the limit member 15 to the moving contact 12 through the limit shaft 14. Under the action of this force, the moving contact 12 has a tendency to rotate away from the stationary contact 22. The second force reference line e is located between the center point of the first rotating shaft 13 and the second end 12b of the moving contact 12, and can also be described as the second force reference line e is located between the second reference line f and the second end 12b of the moving contact 12. The second reference line f is perpendicular to the second tangent line d and passes through the center point of the first rotating shaft 13.

[0083] The embodiment of the present disclosure does not limit which end of the first end 12a and the second end 12b of the moving contact 12 is provided with the moving contact 120. The specific location of the moving contact 120 needs to be determined according to the relative position relationship between the stationary contact 2 and the moving contact system 1. In some examples, such as Figure 5 As shown, the moving contact point 120 of the moving contact 12 is located at the second end 12b of the moving contact 12. In other examples, such as Figure 6 As shown, the movable contact point 120 of the movable contact 12 is located at the first end 12 a of the movable contact 12 .

[0084] In some examples, such as Figure 7 and Figure 8As shown, on a reference section perpendicular to the first rotation axis 13, a first connecting line XY is set to pass through the first center point X of the first rotation axis 13 and the second center point Y of the limit axis 14. A second connecting line YZ is set to pass through the second center point Y of the limit axis 14 and the third center point Z of the second rotation axis 16. Figure 7 and Figure 8 As shown in the upper part of , in the connected state, the angle between the first connecting line XY and the second connecting line YZ is the first angle. Figure 7 and Figure 8 As shown in the lower part of , in the repelled state, the angle between the first line XY and the second line YZ is the second angle.

[0085] Among them, one of the first angle and the second angle is an acute angle, and the other is an obtuse angle. This means that in the connected state and in the repelled state, the moving contact 12 has opposite rotation trends. In this way, by reasonably setting the positions of the moving contact system 1 and the stationary contact 2, it can be achieved that in the connected state, the limiter 15 applies a force to the moving contact 12 through the limiter shaft 14 to rotate the moving contact 12 toward the stationary contact 2. In the repelled state, the limiter 15 applies a force to the moving contact 12 through the limiter shaft 14 to rotate the moving contact 12 away from the stationary contact 2.

[0086] The embodiment of the present disclosure does not limit which of the first angle and the second angle is an acute angle and which is an obtuse angle. The specific setting method needs to be determined according to the relative position relationship between the stationary contact 2 and the moving contact system 1. In some examples, such as Figure 7 As shown in the upper part, the first angle is an obtuse angle, such as Figure 7 As shown in the lower part, the second angle is an acute angle. In other examples, such as Figure 8 As shown in the upper part, the first angle is an acute angle, such as Figure 8 As shown in the lower part, the second angle is an obtuse angle.

[0087] The embodiment of the present disclosure does not limit the angle A that the moving contact 12 rotates from the connected state to the repelled state. In some examples, such as Fig. 9 As shown, the angle A is greater than 15°, for example, 19°. In some examples, the angle A is less than 30°. The angle A can also be understood as the circumferential angle occupied by the first limiting groove 1511 and the second limiting groove 1512 with the center point of the first rotating shaft 13 as the circle point.

[0088] In some examples, such as Fig.10 and Fig.12As shown, the limiting member 15 includes two limiting plates 151 and a connecting plate 152. The two limiting plates 151 are opposite to each other and connected by the connecting plate 152. The two limiting plates 151 each have a first limiting groove 1511 and a second limiting groove 1512. The limiting shaft 14 passes through the moving contact 12, and the two ends of the limiting shaft 14 are respectively used to cooperate with the first limiting groove 1511 or the second limiting groove 1512 of the two limiting plates 151.

[0089] In this way, both ends of the limiting shaft 14 are simultaneously stuck in the two first limiting grooves 1511 or the two second limiting grooves 1512, so that the limiting shaft 14 is subjected to a more uniform force, thereby enabling the moving contact 12 to be more stably maintained in the connected state and the repelled state.

[0090] In some examples, such as Fig.10 and Fig.11 As shown, the limiting shaft 14 includes a first shaft segment 141, two second shaft segments 142 and two third shaft segments 143. The two second shaft segments 142 are respectively connected to the two ends of the first shaft segment 141, and the two third shaft segments 143 are respectively connected to the ends of the two second shaft segments 142 away from the first shaft segment 141. The outer diameters of the first shaft segment 141 and the third shaft segment 143 are both larger than the outer diameter of the second shaft segment 142, and the outer diameter of the first shaft segment 141 is larger than or equal to the outer diameter of the third shaft segment 143. Fig.10 As shown, the first shaft section 141 passes through the moving contact 12, and the two second shaft sections 142 respectively cooperate with the first limiting grooves 1511 or the second limiting grooves 1512 of the two limiting plates 151. The two third shaft sections 143 are respectively located outside the two limiting plates 151.

[0091] In this way, in the axial direction of the limiting shaft 14, the limiting shaft 14 is clamped by the two limiting plates 151, which reduces the axial shaking of the limiting shaft 14 and improves the stability of the limiting shaft 14. In addition, the outer diameter of the second shaft segment 142 of the limiting shaft 14 matches the inner diameter of the through hole through which the second shaft segment 142 passes. When the limiting shaft 14 is installed on the moving contact 12, the third shaft segment 143 needs to be passed through the moving contact 12 first. Therefore, in order to avoid the third shaft segment 143 from being unable to pass through the through hole set on the moving contact 12, the embodiment of the present disclosure sets the outer diameter of the first shaft segment 141 to be greater than or equal to the outer diameter of the third shaft segment 143.

[0092] In some examples, such as Fig.12 As shown, the two limit plates 151 are each provided with a shaft hole 1513, and the two shaft holes 1513 are opposite to each other. The second shaft 16 passes through the two shaft holes 1513, and both ends of the second shaft 16 are rotatably connected to the support member 11. In this way, the limit member 15 and the support member 11 are rotatably connected through the second shaft 16.

[0093] In some examples, such as Figure 3 and Figure 4As shown, the elastic member 17 is a double torsion spring, and the elastic member 17 includes a common torsion arm 171 and two branch torsion arms 172. The common torsion arm 171 abuts against the support member 11. The two branch torsion arms 172 are located on both sides of the moving contact 12 and abut against the two limit plates 151 respectively. In this way, the force on the limit member 15 is more uniform.

[0094] In some examples, such as Figure 3 and Figure 4 As shown, each limiting plate 151 has an elastic member abutting portion 153 protruding away from the other limiting plate 151. Both elastic member abutting portions 153 have grooves 154, and the two branch torsion arms 172 extend into the two grooves 154 respectively. In this way, the abutment between the branch torsion arms 172 and the limiting plate 151 is more stable.

[0095] In some examples, such as Fig.12 As shown, the support member 11 is provided with a receiving cavity 110. One end of the moving contact 12 is arranged inside the receiving cavity 110, and is rotatably connected to the support member 11 through a first rotating shaft 13. The first rotating shaft 13 is arranged in the receiving cavity 110, and first rotating shaft mounting grooves 111 are arranged on two opposite cavity walls of the receiving cavity 110. Both ends of the first rotating shaft 13 are respectively located in the two first rotating shaft mounting grooves 111.

[0096] In addition, the limiting shaft 14 , the limiting member 15 , the second rotating shaft 16 and the elastic member 17 are also disposed in the accommodating cavity 110 .

[0097] The embodiment of the present disclosure further provides a circuit breaker. The circuit breaker includes the above-mentioned moving contact system 1 and stationary contact 2. The circuit breaker may be a low-voltage circuit breaker, but is not limited thereto.

[0098] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A moving contact system, characterized in that: The moving contact system (1) comprises a support member (11), a moving contact (12), a first rotating shaft (13), a limiting shaft (14) and a limiting member (15); The moving contact (12) is rotatably connected to the support member (11) via the first rotating shaft (13); The limiting shaft (14) is arranged on the moving contact (12) and is parallel to the first rotating shaft (13); The limiting member (15) is arranged on the supporting member (11), and the limiting member (15) has a first limiting groove (1511) and a second limiting groove (1512); The moving contact (12) has a connected state and a repelled state. In the connected state, the moving contact (12) is in contact with the stationary contact (2), and the limiting shaft (14) is stuck in the first limiting groove (1511). In the repelled state, the moving contact (12) is separated from the stationary contact (2), and the limiting shaft (14) is stuck in the second limiting groove (1512).

2. The moving contact system according to claim 1, characterized in that: The moving contact system (1) further comprises a second rotating shaft (16) and an elastic member (17); The limiting member (15) is rotatably connected to the supporting member (11) via the second rotating shaft (16), and the second rotating shaft (16) is parallel to the first rotating shaft (13); The elastic member (17) applies a force to the limiting member (15) so that the limiting member (15) rotates toward the moving contact (12), and in the connected state, the limiting member (15) applies a force to the moving contact (12) through the limiting shaft (14) so ​​that the moving contact (12) rotates toward the stationary contact (2), and in the repelling state, the limiting member (15) applies a force to the moving contact (12) through the limiting shaft (14) so ​​that the moving contact (12) rotates away from the stationary contact (2).

3. The moving contact system according to claim 2, characterized in that: On a reference section perpendicular to the first rotation axis (13): In the connected state, assuming that the first tangent line (a) passes through the center point of the second rotating shaft (16) and is tangent to the first limiting groove (1511) at the first tangent point, assuming that the first force reference line (b) is perpendicular to the first tangent line (a) and passes through the first tangent point, then the first force reference line (b) is located between the center point of the first rotating shaft (13) and the first end (12a) of the moving contact (12); In the repelling state, the second tangent (d) passes through the center point of the second rotating shaft (16) and is tangent to the second limiting groove (1512) at the second tangent point, and the second force reference line (e) is perpendicular to the second tangent (d) and passes through the second tangent point. Then, the second force reference line (e) is located between the center point of the first rotating shaft (13) and the second end (12b) of the moving contact (12).

4. The moving contact system according to claim 2, characterized in that: On a reference section perpendicular to the first rotating shaft (13), a first connecting line (XY) is set to pass through a first center point (X) of the first rotating shaft (13) and a second center point (Y) of the limiting shaft (14), and a second connecting line (YZ) is set to pass through the second center point (Y) of the limiting shaft (14) and a third center point (Z) of the second rotating shaft (16); In the connected state, the angle between the first connecting line (XY) and the second connecting line (YZ) is a first angle, and in the disconnected state, the angle between the first connecting line (XY) and the second connecting line (YZ) is a second angle; Among them, one of the first angle and the second angle is an acute angle, and the other is an obtuse angle.

5. The moving contact system according to any one of claims 2 to 4, characterized in that: The limiting member (15) comprises a connecting plate (152) and two limiting plates (151), the two limiting plates (151) are opposite to each other and connected via the connecting plate (152), and the two limiting plates (151) both have the first limiting groove (1511) and the second limiting groove (1512); The limiting shaft (14) passes through the moving contact (12), and two ends of the limiting shaft (14) respectively cooperate with the first limiting groove (1511) or the second limiting groove (1512) of the two limiting plates (151).

6. The moving contact system according to claim 5, characterized in that: The limiting shaft (14) comprises a first shaft section (141), two second shaft sections (142) and two third shaft sections (143); The two second shaft segments (142) are respectively connected to two ends of the first shaft segment (141), and the two third shaft segments (143) are respectively connected to ends of the two second shaft segments (142) away from the first shaft segment (141); The outer diameters of the first shaft segment (141) and the third shaft segment (143) are both greater than the outer diameter of the second shaft segment (142), and the outer diameter of the first shaft segment (141) is greater than or equal to the outer diameter of the third shaft segment (143); The first shaft section (141) passes through the moving contact (12), the two second shaft sections (142) respectively cooperate with the first limiting groove (1511) or the second limiting groove (1512) of the two limiting plates (151), and the two third shaft sections (143) are respectively located on the outside of the two limiting plates (151).

7. The moving contact system according to claim 5, characterized in that: The two limiting plates (151) are each provided with a rotation shaft hole (1513), and the two rotation shaft holes (1513) are opposite to each other; The second rotating shaft (16) passes through the two rotating shaft holes (1513), and both ends of the second rotating shaft (16) are rotatably connected to the supporting member (11).

8. The moving contact system according to claim 5, characterized in that: The elastic member (17) is a double torsion spring, and the elastic member (17) comprises a common torsion arm (171) and two branch torsion arms (172); The common torsion arm (171) abuts against the support member (11); The two branch torsion arms (172) are located on both sides of the moving contact (12) and respectively abut against the two limit plates (151).

9. The moving contact system according to claim 8, characterized in that: Each of the limiting plates (151) has an elastic member abutting portion (153) protruding away from the other limiting plate (151); The two elastic member abutting portions (153) each have a groove (154), and the two branch torsion arms (172) extend into the two grooves (154) respectively.

10. A circuit breaker, characterized in that: The circuit breaker comprises the moving contact system according to any one of claims 1-9.

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