Moving contact assembly for circuit breaker and switching device

Abstract

The embodiment of the invention provides a moving contact assembly and a switching device for a circuit breaker, and the moving contact assembly comprises a moving contact which is in contact with a static contact of the circuit breaker at a switching-on position, and is separated from the static contact at a switching-off position and a clamping position; the support is suitable for driving the moving contact to rotate around the axis, the support comprises a pair of tension spring coupling assemblies which are symmetrically arranged about the center of the rotation axis, and each tension spring coupling assembly comprises a sliding groove, a connecting part fixedly arranged at one end of the sliding groove and a movable part capable of sliding along the sliding groove; one end of each tension spring assembly is coupled to the connecting part, the other end of each tension spring assembly is coupled to the movable part, when the moving contact is located at the opening position or the closing position, the movable part makes contact with the opening and closing section, and when the moving contact is located at the clamping position, the movable part slides to the clamping section and makes contact with the clamping section. Therefore, the stress applied to the tension spring assembly can be reduced, and the manufacturing process requirement of the tension spring assembly can be lowered.

Description

Technical Field

[0001] Example embodiments of the present disclosure generally relate to the field of switchgear, and in particular, to a moving contact assembly for a circuit breaker and a switchgear. Background Art

[0002] Circuit breakers are safety devices used to prevent the current from exceeding the safety range in situations such as overload, short circuit and ground fault. The moving contact of the circuit breaker is a key component to realize the breaking and closing functions. The moving contact is usually driven by the tension of the double tension spring to ensure reliable switching operation. However, since the circuit breaker needs to undergo frequent breaking and closing operations during operation, the stress applied to the double tension spring is relatively large. This means that the double tension spring material must have sufficient durability and strength to withstand cyclic loads and maintain stable performance for a long time. In actual use, existing circuit breakers may experience failure phenomena such as double tension spring lugs or double tension spring bridges breaking under high load or high frequency conditions. These failures may cause serious consequences such as load damage, safety hazards and even system failures. Summary of the invention

[0003] An object of the present disclosure is to provide a moving contact assembly and a switch device for a circuit breaker, so as to at least partially solve the above-mentioned problems and / or other potential problems existing in the traditional switch device.

[0004] In a first aspect of the present disclosure, a moving contact assembly for a circuit breaker is provided. The moving contact assembly comprises: a moving contact, comprising a contact arm and a moving contact located at an end surface of the contact arm, and adapted to rotate about a rotation axis between an opening position, a closing position and a locking position, wherein the moving contact contacts a static contact of the circuit breaker in the closing position, and the moving contact and the static contact are separated in the opening position and the locking position; a bracket coupled to the moving contact and adapted to drive the moving contact to rotate about the axis, wherein the bracket comprises a pair of tension spring coupling assemblies arranged symmetrically about the center of the rotation axis, wherein each tension spring coupling assembly comprises a slide groove, a connecting portion fixedly arranged at one end of the slide groove and a movable portion slidable along the slide groove; and a pair of tension spring assemblies, wherein one end of each tension spring assembly is coupled to the connecting portion and the other end is coupled to the movable portion, wherein the contact arm comprises a contact portion, an outer surface of the contact portion comprises at least an opening and closing section and a locking section, and wherein the movable portion contacts the opening and closing section when the moving contact is in the opening position or the closing position, and wherein the movable portion slides to the locking section and contacts the locking section when the moving contact is in the locking position.

[0005] In an embodiment according to the present disclosure, by coupling a contact portion on the moving contact, the arc surface of the opening and closing section and the locking section of the contact portion is used to change the force condition of the moving contact. When the moving contact is in the opening position or the closing position, the movable portion of the tension spring coupling assembly moves on the opening and closing section of the contact portion, and the force direction of the moving contact is in the radial direction of the arc surface of the opening and closing section, so that the stress of the tension spring assembly is reduced. When the moving contact is in the locking position, the movable portion of the tension spring coupling assembly is confined in the accommodating groove, and the force direction of the moving contact is in the radial direction of the arc surface of the locking section, so that the stress of the tension spring assembly is reduced, and the movable portion balances the torque of the moving contact in the clockwise and counterclockwise directions along the rotation axis. Other benefits will be described in detail below in conjunction with corresponding embodiments.

[0006] In some embodiments, the contact portion further includes: a transition section, arranged between the opening and closing section and the locking section, and used to make the moving contact transition from the opening and closing position to the locking position.

[0007] In some embodiments, the movable contact further includes an insert coupled to the contact arm to form a contact portion.

[0008] In some embodiments, the movable contact further comprises: a coupling groove symmetrically formed on the contact arm with the rotation axis as the center, and wherein the insert further comprises: an embedding portion arranged opposite to the contact portion and adapted to be embedded in the coupling groove.

[0009] In some embodiments, the coupling slot has a dovetail shape in a cross-section perpendicular to the rotation axis.

[0010] In some embodiments, the bend portion of the dovetail shape transitions into an arc.

[0011] In some embodiments, each tension spring assembly includes: a pair of single tension springs, which are respectively arranged at two ends of the moving contact in the axial direction and are suitable for providing tension.

[0012] In some embodiments, the single tension spring includes: an elastic portion; a coupling portion, which is arranged at the elastic portion and coupled to the movable portion; and a hanging portion, which is arranged at an end of the elastic portion away from the coupling portion and coupled to the connecting portion.

[0013] In some embodiments, the moving contact further comprises: a receiving groove, which is arranged at an edge of the coupling groove away from the rotation axis, so as to carry the movable part together with the locking section when the moving contact is in the locking position.

[0014] In some embodiments, the movable portion includes a movable pin that can slide in a slide groove, and an axial direction of the movable pin is parallel to the rotation axis.

[0015] In a second aspect of the present disclosure, a switch device is provided, comprising: a pair of stationary contacts arranged to be electrically connected to a power supply side and a power consumption side of the switch device, respectively; a power mechanism; and a moving contact assembly according to the first aspect.

[0016] It should be understood that the contents described in this content section are not intended to limit the key features or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0018] Figure 1 The overall structural schematic diagram of the moving contact assembly of the embodiment of the present disclosure is shown;

[0019] Figure 2 An exploded view of a moving contact assembly according to an embodiment of the present disclosure is shown;

[0020] Figure 3 A schematic structural diagram of a moving contact coupling insert according to an embodiment of the present disclosure is shown;

[0021] Figure 4 A schematic structural diagram of a moving contact assembly in a closed state according to an embodiment of the present disclosure is shown;

[0022] Figure 5 A schematic structural diagram of a moving contact assembly in an open state according to an embodiment of the present disclosure is shown; and

[0023] Figure 6 A schematic structural diagram of a moving contact assembly in a locked state according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0024] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0025] In the description of the embodiments of the present disclosure, the term "including" and similar terms should be understood as open inclusion, that is, "including but not limited to". The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The term "some embodiments" should be understood as "at least some embodiments". Other explicit and implicit definitions may be included below. The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may be included below.

[0026] As briefly mentioned above, a circuit breaker is a device used to control and protect an electric circuit. The moving contact is an important component in a circuit breaker for switching current. The moving contact is responsible for opening or closing the current path and can withstand high voltage and high current. And the tension spring provides the closing force and opening force in the circuit breaker. In order to ensure reliability and conductive performance, existing circuit breakers use various materials to construct the moving contact, such as copper alloy, silver alloy or tungsten copper alloy. These materials have good conductive properties and can withstand high temperature and high pressure environments.

[0027] However, due to long-term use or environmental factors, the moving contact may be worn or oxidized, resulting in poor contact or high resistance. This will affect the normal operation of the circuit breaker and may cause overload, failure or even fire risks. And after long-term use, the tension spring may become loose, deteriorate or deform. This will cause the circuit breaker to have insufficient operating force or be unable to stably maintain the correct position, and in extreme cases it may not even be completely closed or opened. In some cases, the existing circuit breaker uses a double tension spring, which also has some challenges as a component to support and maintain the compressed state of the moving contact. For example, under high load conditions, the tension spring may encounter problems such as stress concentration and deformation, which may cause the breakage of the tension spring's hanging ear or the double tension spring bridge. At the same time, in special environments (such as high temperature and humidity), corrosive substances may have an adverse effect on the material and performance of the tension spring. In order to avoid the problem of fracture of the above-mentioned double tension spring, the existing circuit breaker generally develops more durable and stable tension spring materials, which puts higher requirements on the preparation process of the tension spring, making the current preparation process unable to meet its needs.

[0028] In order to solve or at least partially solve the above-mentioned problems or other potential problems of the switch device of the traditional solution, the embodiment of the present disclosure provides a moving contact assembly solution for a circuit breaker of a switch device such as an air switch. In the moving contact assembly, the arc surface of the opening and closing section and the locking section of the coupling insert on the moving contact is used to change the force direction of the tension spring assembly on the moving contact. When the moving contact is opened or closed, the movable part of the tension spring coupling assembly can be slidably abutted against the opening and closing section of the insert, so that the force direction of the moving contact is in the radial direction of the arc surface of the opening and closing section, so that the stress of the tension spring assembly is reduced. When the moving contact enters the locking position due to tripping, the movable part of the tension spring coupling assembly is limited in the accommodating groove, and the force direction of the moving contact is in the radial direction of the arc surface of the locking section, so that the stress of the tension spring assembly is reduced, and the movable part balances the torque of the moving contact in the clockwise direction and the counterclockwise direction along the rotation axis in the accommodating groove. Thus, during the opening, closing or locking of the circuit breaker, the tension spring assembly can be prevented from encountering stress concentration, thereby reducing the requirements for the tension spring assembly manufacturing process. For example, in some embodiments, the tension spring assembly can include a pair of single tension springs, which effectively reduces the cost, which will be further described later.

[0029] Figure 1 The overall structural schematic diagram of the moving contact assembly 100 according to the embodiment of the present disclosure is shown. Figure 2 The exploded view of the movable contact assembly 100 according to the embodiment of the present disclosure is shown. Figure 1 to Figure 2 To describe the example structure and working process of the moving contact assembly 100 of the switching device. The switching device according to the embodiment of the present disclosure may include a circuit breaker, and may also include any other appropriate switching device including a moving contact and a static contact in addition to the circuit breaker. The concept of the present disclosure will be described below mainly by taking the switching device as a circuit breaker as an example. It should be understood that the case where the switching device is other equipment is also similar, and will not be repeated separately below. The switching device includes a pair of static contacts 210, a power mechanism, and a moving contact assembly 100. A pair of static contacts 210 are arranged to be electrically connected to the power supply side or the power consumption side of the switching device, respectively. The moving contact 110 in the switching device is a movable part that is connected or separated from the static contact 210. When the circuit breaker is in a closed state (such as a closed state), the moving contact 110 is connected to the static contact 210 to form a path so that the current can flow normally to connect the power supply side and the power consumption side. Under the action of the power mechanism or the tripping mechanism (such as the tripping coil) of the switch device, the switch device is in an open state (such as an opening state or a locked state), and the moving contact 110 is quickly separated and cuts off the current path.

[0030] like Figure 1 and Figure 2As shown, the moving contact assembly 100 according to the embodiment of the present disclosure generally includes a moving contact 110, a bracket 120 and a pair of tension spring assemblies 130. For example, the moving contact 110 is rotatably coupled to the bracket 120, and a pair of tension spring assemblies 130 are passed between the moving contact 110 and the bracket 120 to apply tension to the moving contact 110, and the pair of tension spring assemblies 130 are distributed at the position of the moving contact close to the moving contact point 1102. In the closed state, the tension makes the moving contact 110 and the static contact 210 in close contact. The force direction of the pair of tension spring assemblies 130 on the moving contact 110 is changed through the contact portion on the contact arm 1101, thereby reducing the stress of the tension spring and reducing the requirements for the tension spring.

[0031] The following will be combined Figure 1 and Figure 2 The specific structure of the moving contact assembly 100 is described below. Figure 1 and Figure 2 As shown, in the embodiment of the present disclosure, the moving contact 110 includes a contact arm 1101 and the moving contact 1102 mentioned above located on the end surface of the contact arm 1101. The moving contact 1102 rotates around the rotation axis of the bracket 120 between the opening position, the closing position and the locking position. In the closing position, the moving contact 1102 contacts the static contact of the circuit breaker (i.e., the above-mentioned switch device). In the opening position and the locking position, the moving contact 1102 is separated from the static contact.

[0032] The contact arm 1101 includes a contact portion, and the outer surface of the contact portion is in a multi-section curved surface shape, including at least an opening and closing section 1401 and a locking section 1403. The contact portion is constructed so that when the moving contact 110 is in the opening position or the closing position, the movable portion 1204 contacts the opening and closing section 1401. When the moving contact 110 is in the locking position, the movable portion 1204 can slide along the outer surface of the contact portion to the locking section 1403 and contact the locking section 1403. In this way, the direction of the force acting on the tension spring assembly can be changed, thereby avoiding the tension spring assembly from encountering a stress concentration situation, and further reducing the requirements for the tension spring assembly preparation process, which will also be further explained in conjunction with the accompanying drawings in the following text.

[0033] In some embodiments, the contact portion can be formed by an insert 140 coupled to the contact arm 1101, so that the wear resistance of the contact portion can be improved, thereby improving the life of the moving contact assembly. In some alternative embodiments, the contact portion can also be formed integrally with other parts of the contact arm 1101, and the contact portion is subjected to wear resistance treatment by appropriate means. The following will mainly describe the concept of the present disclosure by taking the contact portion formed by the insert 140 as an example. It should be understood that other situations such as integral molding are also similar and will not be described separately in the following.

[0034] In the embodiment of the present disclosure, as mentioned above, in order to enable the insert 140 to be coupled to the moving contact 110. The moving contact 110 also includes a coupling groove 1105. Correspondingly, the insert 140 also includes an embedding portion 1404. The position of the coupling groove 1105 on the moving contact 110 is formed symmetrically on the contact arm 1101 with the rotation axis as the center. The embedding portion 1404 of the insert 140 is arranged opposite to the contact portion of the insert 140, and the embedding portion 1404 is embedded in the coupling groove 1105, so that the insert 140 is firmly embedded in the moving contact 110. In some embodiments, the embedding portion 1404 and the coupling groove 1105 are interference fit.

[0035] In some embodiments, the coupling slot 1105 on the moving contact 110 has a dovetail shape in a cross-section perpendicular to the rotation axis. In other words, the coupling slot 1105 is a closing structure that gradually shrinks from the bottom of the slot to the slot opening, so that the insert 140 cannot be separated in a direction perpendicular to the rotation axis. For example, the bending portion of the dovetail shape has an arc transition.

[0036] In the embodiment of the present disclosure, as mentioned above, the movable contact 110 further includes a receiving groove 1103. The receiving groove 1103 is arranged at the edge of the coupling groove 1105 away from the rotation axis, so as to carry the movable part 1204 together with the locking section 1403 when the movable contact 110 is in the locked position. The movable part 1204 here will be described below.

[0037] In an embodiment of the present disclosure, the bracket 120 as above is coupled with the moving contact 110, and the bracket 120 can drive the moving contact 110 to rotate around the axis. The bracket 120 includes a pair of tension spring coupling assemblies, and is symmetrically arranged with the center of the rotation axis. In some embodiments, each tension spring coupling assembly includes a slide groove 1203, a connecting portion 1205 and a movable portion 1204. The connecting portion 1205 is fixedly disposed at one end of the slide groove 1203, and the movable portion 1204 is arranged to be slidable along the slide groove 1203. For example, the movable portion 1204 may include a movable pin that can slide in the slide groove 1203, and the axial direction of the movable pin is parallel to the rotation axis, that is, the movable pin is always parallel to the rotation axis during movement. The tension spring assembly 130 is elastically connected between the movable portion 1204 such as a movable pin and the connecting portion 1205. When the switch device changes from the closed state to the open state or the locked state, the tension spring assembly 130 is always in a tensioned state between the movable portion 1204 such as a movable pin and the connecting portion 1205, thereby ensuring that the movable contact 110 can always be reset to the closed state. In some embodiments, the connecting portion 1205 and the movable portion 1204 can be rod-shaped or pin-shaped structures, configured by the above-mentioned coupling relationship, so that they are set on the bracket 120, which will not be described in detail here.

[0038] In the embodiment of the present disclosure, as mentioned above, one end of each tension spring assembly 130 is coupled to the connecting portion 1205, and the other end is coupled to the movable portion 1204. Figure 1 As shown, the tension spring assembly 130 may include a pair of single tension springs. The pair of single tension springs are respectively arranged at both ends of the moving contact 110 in the axial direction, and are suitable for providing tension so that the moving contact 110 always has a reset function. In some embodiments, the single tension spring includes an elastic portion 1303, a coupling portion 1302, and a hanging portion 1301. The coupling portion 1302 is arranged at one end of the elastic portion 1303, and is used to couple with the movable portion 1204. By connecting the coupling portion 1302 to the movable portion 1204, the movable portion 1204 is moved when the moving contact 110 moves. The hanging portion 1301 is arranged at the end of the elastic portion 1303 away from the coupling portion 1302, and is coupled with the connecting portion 1205. The tension spring assembly 130 is suitable for at least providing a tension perpendicular to the axial direction to pull the moving contact 110 and at least make the moving contact 110 have a tendency to approach the static contact 210. In some alternative embodiments, the tension spring assembly 130 may also be integrally formed. For example, the tension spring assembly 1303 may be formed by winding a piece of elastic material.

[0039] In the embodiments of the present disclosure, Figure 3 FIG. 1 is a schematic diagram showing the structure of the movable contact 110 coupled to the embedded component 140 according to an embodiment of the present disclosure. Figure 3 As shown, and as mentioned above, by providing the insert 140, the force direction of the movable part 1204 acting on the moving contact 110 can be changed, thereby reducing the stress of the tension spring assembly 130. For example, the insert 140 includes a contact portion, which is used to form a part of the outer surface of the contact arm 1101, and the outer surface of the contact portion contacts the movable part 1204. The outer surface of the contact portion at least includes a switch-on and switch-off section 1401 and a stop section 1403. And when the moving contact 110 is in the open position or the closed position, the movable part 1204 contacts the switch-on and switch-off section 1401, and when the moving contact 110 is in the stop position, the movable part 1204 slides to the stop section 1403 and contacts the stop section 1403. In some embodiments, the line connecting the center of curvature of the switch-on and switch-off section 1401 and the movable part 1204 and the line connecting the center of curvature of the stop section 1403 and the movable part 1204 are respectively located on different sides of the rotation axis in the radial direction.

[0040] By this arrangement, when the moving contact 110 is in the Figure 4 The closed position and Figure 5 In the open position shown in FIG. 1 , the movable portion 1204 contacts different positions of the opening and closing section 1401. In these two positions, the movable portion 1204 is subjected to the tension of the tension spring assembly 130 (for example, Figure 4 and Figure 5F21 in the figure) and the thrust of the chute wall (e.g. Figure 4 and Figure 5 F22 in the figure), the resultant of the two forces is called the pulling resultant force (e.g. Figure 4 and Figure 5 On the other hand, the movable part 1204 is also supported by the surface of the opening and closing section 1401 (e.g. Figure 4 and Figure 5 F3 in the figure), when the equilibrium state is reached, the direction of the supporting force passes through the center of the curvature of the opening and closing section, and is equal to the pulling force but opposite in direction. In these two states (opening and closing states), since the sliding groove wall can jointly provide force, the pulling force of the tension spring assembly 130 is reduced, thereby reducing the requirements for the tension spring assembly 130.

[0041] After tripping, the moving contact is in Figure 6 In the locked position shown in FIG. 1 , the movable portion 1204 is in the locked section 1403. By properly setting the curvature center of the locked section 1403 and the adjacent receiving groove 1103, the rotating portion 1204 not only applies a pulling force (e.g. Figure 6 At the same time, due to the action of the sliding groove wall, a first force (for example, F21 in the figure) is applied to the moving contact to make it rotate counterclockwise. Figure 6 F11 in the figure) and a second force that makes it rotate clockwise (e.g. Figure 6 F22 in the figure), the first force and the second force are approximately along Figure 6 The spring assembly extends in the lateral direction shown in FIG, but in the opposite direction, thereby achieving moment balance together with the tension provided by the tension spring assembly.

[0042] In some embodiments, the contact portion further includes a transition section 1402, which is arranged between the opening and closing section 1401 and the locking section 1403, and is used to make the moving contact 110 slide and transition from the opening and closing position to the locking position. The material of the insert 140 can be stainless steel to enhance wear resistance. In some embodiments, the moving contact 110 is coupled to the bracket 120 by configuring a rotating shaft 1201 on the rotation axis of the bracket 120, and a waist-shaped hole 1104 is configured on the moving contact 110 that cooperates with the rotating shaft 1201. In this way, the moving contact 110 can move in a direction perpendicular to the rotation axis while rotating, so that the moving contact 110 can achieve a locked state.

[0043] In order to more clearly understand the working process of the moving contact assembly 100 according to the embodiment of the present disclosure, Figure 4 A schematic structural diagram of the moving contact assembly 100 in a closed state according to an embodiment of the present disclosure is shown. Figure 5 FIG. 1 is a schematic structural diagram of the moving contact assembly 100 in the open state according to an embodiment of the present disclosure. Figure 6The structure diagram of the moving contact assembly 100 in the locked state of the embodiment of the present disclosure is shown. Figures 4 to 6 To describe an example of the moving contact assembly 100. The working process of the moving contact assembly 100 according to the embodiment of the present disclosure is analyzed in the closing state, the opening state and the stuck state. One end of the tension spring assembly 130 of the moving contact assembly 100 is fixed, and the other end acts on the insert 140 coupled to the moving contact 110 through the movable part 1204. When the moving contact 110 moves, the arc surface of the closing and opening section 1401 or the stuck section 1403 on the insert 140 changes the force direction on the moving contact 110. Figure 4 and Figure 5 As shown, when the switch is transitioning from closing to opening, the power mechanism drives the bracket 120 through the drive hole 1202 to apply a driving force to the moving contact 110 through the protrusion 1206 (for example Figure 4 and Figure 5 F1 in the figure makes the moving contact 110 rotate around the rotation axis and disengage from the stationary contact 210. It can be understood that, if Figure 5 The force when the static contact 210 contacts the moving contact 110 is F1. At this time, the movable part 1204 is always in contact with the opening and closing section 1401 of the insert 140, and the force direction of the movable contact 110 is in the radial direction of the arc surface of the opening and closing section 1401. Through the analysis of the force, the force on the movable contact 110 can be decomposed into the force along the expansion and contraction direction of the tension spring assembly 130 and the force of the slide groove 1203 of the bracket 120 on the movable part 1204 in the counterclockwise direction. As mentioned above, this solves the problem that the existing force direction of the movable contact 110 is concentrated in the expansion and contraction direction of the tension spring, thereby reducing the problem of concentrated force on the tension spring assembly. Figure 6 As shown in FIG. 1 , when the switch is switched from the closed state to the locked state, the power mechanism drives the moving contact 110 to separate from the stationary contact 210, so that the movable portion 1204 is locked in the receiving groove 1103. At this time, the movable portion 1204 abuts against the locking section 1403 of the insert 140 and the wall of the receiving groove 1103, and the force direction of the moving contact 110 (for example, Figure 6 F2) is the first force (for example, the force in the radial direction of the arc surface of the locking section 1403 and the force required to reset the moving contact 110 in the reverse direction) Figure 6 On the other hand, the movable portion 1204 is also supported by the surface of the locking section 1401 (e.g. Figure 6 By analyzing the force, the force F2 on the moving contact 110 can be decomposed into the force along the extension direction of the tension spring assembly 130 (for example Figure 6 F21 in the figure) and the second force (e.g. F21 in the figure) of the slide groove 1203 of the bracket 120 on the movable part 1204 in the clockwise direction. Figure 6 F22 in the figure), the resultant of the two forces is called the pulling resultant force (e.g. Figure 6F2 in the figure). Under the action of the tension spring assembly, a tension force is applied to the contact (e.g. Figure 6 At the same time, due to the action of the sliding groove wall, a first force (for example, F21 in the figure) is applied to the moving contact to make it rotate counterclockwise. Figure 6 F11 in the figure), at this time, the torques in the clockwise direction and the counterclockwise direction are balanced. This reduces the force concentration on the tension spring assembly 130 while ensuring the reliability of the switch device to a certain extent, thereby reducing the requirements for the tension spring assembly 130.

[0044] The above descriptions of various implementations of the present disclosure are exemplary, non-exhaustive, and not limited to the disclosed implementations. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described implementations. The selection of terms used herein is intended to best explain the principles of the implementations, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the various implementations disclosed herein.

Claims

1. A moving contact assembly for a circuit breaker, comprising: A moving contact (110), comprising a contact arm (1101) and a moving contact (1102) located on the end surface of the contact arm (1101), and adapted to rotate about a rotation axis between an opening position, a closing position and a locking position, wherein in the closing position, the moving contact (1102) contacts with a static contact (2102) of the circuit breaker, and in the opening position and the locking position, the moving contact (1102) and the static contact (2102) are separated; a bracket (120), coupled to the moving contact (110), and adapted to drive the moving contact (110) to rotate around the rotation axis, the bracket (120) comprising a pair of tension spring coupling assemblies arranged symmetrically about the rotation axis, each of the tension spring coupling assemblies comprising a slide groove (1203), a connecting portion (1205) fixedly arranged at one end of the slide groove (1203), and a movable portion (1204) slidable along the slide groove (1203); and a pair of tension spring assemblies (130), one end of each tension spring assembly (130) is coupled to the connecting portion (1205), and the other end is coupled to the movable portion (1204), The contact arm (1101) comprises a contact portion, the outer surface of which comprises at least an opening and closing section (1401) and a locking section (1403), and when the moving contact (110) is in the opening position or the closing position, the movable portion (1204) contacts the opening and closing section (1401), and when the moving contact (110) is in the locking position, the movable portion (1204) slides to the locking section (1403) and contacts the locking section (1403).

2. The moving contact assembly according to claim 1, characterized in that: The contact portion further comprises: The transition section (1402) is arranged between the opening and closing section (1401) and the locking section (1403) and is used to make the moving contact (110) transition from the opening and closing position to the locking position.

3. The moving contact assembly according to claim 2, characterized in that: The moving contact (110) further comprises: An insert (140) is coupled to the contact arm (1101) to form the contact portion.

4. The moving contact assembly according to claim 3, characterized in that: The moving contact (110) further comprises: A coupling groove (1105) is symmetrically formed on the contact arm (1101) with the rotation axis as the center, and wherein the insert (140) further comprises: The embedding portion (1404) is arranged opposite to the contact portion and is suitable for being embedded in the coupling groove (1105).

5. The moving contact assembly according to claim 4, characterized in that: The coupling groove (1105) has a dovetail shape in a cross-section perpendicular to the rotation axis.

6. The moving contact assembly according to claim 5, characterized in that: The dovetail-shaped bending portion has an arc transition.

7. The moving contact assembly according to any one of claims 1 to 6, characterized in that: Each tension spring assembly (130) comprises: A pair of single tension springs are respectively arranged at two ends of the moving contact (110) in the axial direction and are suitable for providing tension.

8. The moving contact assembly according to claim 7, characterized in that: The single tension spring comprises: Elastic part (1303); a coupling portion (1302), arranged at one end of the elastic portion (1303) and coupled to the movable portion (1204); and The hanging portion (1301) is arranged at the end of the elastic portion (1303) away from the coupling portion (1302) and is coupled to the connecting portion (1205).

9. The moving contact assembly according to any one of claims 4 to 6, characterized in that: The moving contact (110) further comprises: The accommodating groove (1103) is arranged at an edge of the coupling groove (1105) away from the rotation axis, so as to carry the movable part (1204) together with the locking section (1403) when the moving contact (110) is in the locking position.

10. The moving contact assembly according to any one of claims 1 to 6 and 8, characterized in that: The movable portion (1204) includes a movable pin that can slide in the slide groove (1203), and the axial direction of the movable pin is parallel to the rotation axis.

11. A switch device, characterized in that: include: A pair of stationary contacts arranged to be electrically connected to the power supply side and the power consumption side of the switch device respectively; Power mechanism; as well as A moving contact assembly according to any one of claims 1 to 10.

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