Moving contact device and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a moving contact device and a circuit breaker, the moving contact device comprises a contact knife holder, a moving contact knife and an elastic assembly located between the contact knife holder and the moving contact knife, and the contact knife holder is provided with a first limiting surface and a second limiting surface; the movable contact knife is located between the first limiting surface and the second limiting surface, and is rotatably arranged on the contact knife holder between a first position and a second position; at the first position, the movable contact knife and the first limiting surface are arranged at an interval, a first gap is formed between the movable contact knife and the second limiting surface, at the second position, the movable contact knife abuts against the first limiting surface, and a second gap smaller than the first gap is formed between the movable contact knife and the second limiting surface. The movable contact knife can rotate towards the second position when the current in the circuit where the movable contact knife is located is higher than a current threshold value, extrudes the elastic assembly and can be kept at the second position under the elastic force effect of the elastic assembly. The impact force of the movable contact knife on the contact knife holder is small, thereby preventing the contact knife holder from being broken and ensuring normal use of the circuit breaker.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a moving contact device and a circuit breaker. Background Art

[0002] The moving contact device of the circuit breaker includes a contact knife seat and a moving contact knife. The contact knife seat is rotatably arranged in the shell of the circuit breaker and is connected with the operating mechanism of the circuit breaker. The operating mechanism can drive the contact knife seat to rotate, so that the moving contact knife contacts or separates from the static contact under the drive of the contact knife seat. When a serious short circuit or other faults occur, a large fault current will generate sufficient repulsive force between the moving contact knife and the static contact. Under the action of the repulsive force, the moving contact knife rotates relative to the contact knife seat to the repulsion state. A limiting surface is arranged on the contact knife seat, and the moving contact knife can rotate relative to the contact knife seat to abut against the limiting surface to be stable in the repulsion state.

[0003] In the prior art, when the moving contact knife rotates relative to the contact knife seat to the repulsion state and contacts the contact knife seat instantaneously, it will hit the contact knife seat with a large impact force, which may cause damage and fracture at the limiting surface of the contact knife seat, resulting in single-phase non-power-on during the subsequent closing process of the circuit breaker. Even more seriously, it will even cause fracture at other positions of the contact knife seat, resulting in multi-phase non-power-on, affecting the normal use of the circuit breaker.

[0004] Therefore, there is an urgent need for a moving contact device and a circuit breaker to solve the above problems existing in the prior art. Content of the Utility Model

[0005] The purpose of the utility model is to provide a moving contact device and a circuit breaker, which can effectively limit the moving contact knife in the repulsion state when the moving contact knife rotates relative to the contact knife seat, and can reduce the impact of the moving contact knife on the contact knife seat, avoid fracture of the contact knife seat, and ensure the normal use of the circuit breaker.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] On the one hand, a moving contact device is provided, including: <(

[0008] A contact knife seat, provided with a first limiting surface and a second limiting surface;

[0009] A moving contact knife, located between the first limiting surface and the second limiting surface, and the moving contact knife is rotatably installed on the contact knife seat between a first position and a second position; the first position is a position where the moving contact knife is spaced from the first limiting surface and has a first gap with the second limiting surface, and the second position is a position where the moving contact knife abuts against the first limiting surface and has a second gap with the second limiting surface, and the second gap is smaller than the first gap;

[0010] An elastic component, located between the contact knife seat and the moving contact knife;

[0011] When the current in the circuit where the moving contact knife is located is higher than the current threshold, the moving contact knife can rotate towards the second position and squeeze the elastic component, and the moving contact knife can be held at the second position under the elastic force of the elastic component.

[0012] As an alternative embodiment of the moving contact device provided by the present utility model, the elastic component includes:

[0013] A pressing plate, rotatably connected to the contact knife seat and slidably cooperating with the moving contact knife, and the pressing plate is located on the side of the moving contact knife facing away from the second limiting surface;

[0014] An elastic member, with one end abutted against the contact knife seat and the other end abutted against the side of the pressing plate facing away from the moving contact knife.

[0015] As an alternative embodiment of the moving contact device provided by the present utility model, the elastic component further includes a mounting shaft, and the pressing plate includes:

[0016] A connecting plate, which is rotatably connected to the contact knife seat through the mounting shaft;

[0017] A guiding plate, connected to the connecting plate, the guiding plate abuts against the elastic member and slidably cooperates with the moving contact knife.

[0018] As an alternative embodiment of the moving contact device provided by the present utility model, a first guiding surface, a guiding arc surface and a second guiding surface which are sequentially connected are arranged on the side of the guiding plate facing the moving contact knife, the first guiding surface and the second guiding surface are arranged at an angle, and the end of the second guiding surface away from the first guiding surface extends obliquely towards the direction close to the elastic member;

[0019] The moving contact knife at the first position abuts against the first guiding surface and / or the guiding arc surface, and the moving contact knife at the second position abuts against the second guiding surface and / or the guiding arc surface.

[0020] As an alternative embodiment of the moving contact device provided by the present utility model, the guiding plate includes a first plate segment and a second plate segment which are bent and connected, the first plate segment is provided with the first guiding surface, the second plate segment is provided with the second guiding surface, and the elastic member abuts against the first plate segment and / or the second plate segment;

[0021] And / or, the connecting plate includes a first connecting portion and two second connecting portions, the first connecting portion is bent and connected to the guiding plate, and the two second connecting portions are respectively bent and connected to both ends of the first connecting portion, and the mounting shaft is rotatably fitted through the two second connecting portions.

[0022] As an alternative solution of the moving contact device provided by the present utility model, the moving contact blade is provided with a first sliding surface, a sliding arc surface and a second sliding surface connected in sequence. The first sliding surface and the second sliding surface are arranged at an angle, and one end of the first sliding surface far from the second sliding surface extends obliquely towards the rotation center of the moving contact blade;

[0023] The moving contact blade at the first position abuts against the pressing plate through the first sliding surface, the moving contact blade at the second position abuts against the pressing plate through the second sliding surface, and abuts against the first limiting surface through the first sliding surface.

[0024] As an alternative solution of the moving contact device provided by the present utility model, the moving contact device further includes a sliding shaft, the sliding shaft is connected to the moving contact blade and is arranged at an interval from the rotation center of the moving contact blade, and the sliding shaft slidably abuts against the pressing plate.

[0025] As an alternative solution of the moving contact device provided by the present utility model, the contact blade seat is provided with a limiting groove, a part of the elastic member is located in the limiting groove, and can expand and contract along the extending direction of the limiting groove when the pressing plate rotates.

[0026] As an alternative solution of the moving contact device provided by the present utility model, the moving contact blade includes a first contact blade plate and a second contact blade plate connected to each other. A moving contact point is arranged at one end of the first contact blade plate far from the second contact blade plate. The second contact blade plate is rotatably connected to the contact blade seat and is provided with an arc avoiding groove recessed relative to the first contact blade plate. The arc avoiding groove is located between the rotation centers of the first contact blade plate and the second contact blade plate. The moving contact blade at the first position abuts against the contact blade seat through the bottom wall of the arc avoiding groove;

[0027] And / or, a moving contact point is arranged at one end of the moving contact blade, and the other end is configured to be clamped in the clamping space of the conductive connection plate. An assembly groove is recessed at the edge of the other end of the moving contact blade;

[0028] And / or, one end of the moving contact blade extending out of the contact blade seat has a first end surface and a second end surface arranged at an angle. The connection part of the first end surface and the second end surface forms an arc starting point, and the arc starting point is configured to introduce an arc into the arc extinguishing chamber of the circuit breaker.

[0029] On the other hand, a circuit breaker is provided, which includes a housing, a static contact and the above-mentioned moving contact device. The static contact and the moving contact device are installed in the housing. The contact blade seat is rotatably connected to the housing, and the moving contact blade is used for making conductive contact with or separating from the static contact under the drive of the contact blade seat.

[0030] The beneficial effects of the present utility model:

[0031] The present utility model provides a moving contact device and a circuit breaker including the moving contact device. When the current in the circuit where the moving contact blade of the moving contact device is located is higher than the current threshold, the moving contact blade rotates from a first position to a second position relative to the contact blade seat. During the rotation process, the elastic component is squeezed until the moving contact blade abuts against the first limiting surface of the contact blade seat, stopping the moving contact blade at the second position and keeping it at the second position under the elastic force of the elastic component, effectively limiting the moving contact blade at the second position. Since the elastic component is squeezed during the rotation of the moving contact blade to the second position, part of the kinetic energy of the moving contact blade is absorbed by the elastic component, reducing the impact of the moving contact blade on the first limiting surface. At the same time, when the moving contact blade rotates and abuts against the first limiting surface, there is a second gap between the moving contact blade and the second limiting surface, which will not cause an impact on the second limiting surface. After the moving contact blade abuts against the first limiting surface, even if the moving contact blade continues to rotate due to inertia to approach the second limiting surface or even abuts against the second limiting surface, it will not cause a large impact on the second limiting surface, effectively reducing the impact of the moving contact blade on the contact blade seat when it is repelled, avoiding the fracture of the contact blade seat, and ensuring the normal use of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments of the present utility model will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.

[0033] Figure 1 is a schematic structural view of the moving contact device provided by the specific embodiment of the present utility model;

[0034] Figure 2 is a first cross-sectional view of the moving contact device provided by Embodiment 1 of the present utility model when the moving contact blade is in the second position;

[0035] Figure 3 is a cross-sectional view of the moving contact device provided by Embodiment 1 of the present utility model when the moving contact blade is in the first position;

[0036] Figure 4 is a second cross-sectional view of the moving contact device provided by Embodiment 1 of the present utility model when the moving contact blade is in the second position;

[0037] Figure 5 is an axonometric view of the contact blade seat of the moving contact device provided by the specific embodiment of the present utility model;

[0038] Figure 6 is a cross-sectional view of the contact blade seat provided by Embodiment 1 of the present utility model;

[0039] Figure 7It is a partial view of the contact knife holder provided in the first embodiment of the present utility model;

[0040] Figure 8 It is a schematic structural view of the pressure plate provided in the first embodiment of the present utility model;

[0041] Figure 9 It is a schematic structural view of the moving contact knife provided in the specific implementation manner of the present utility model;

[0042] Figure 10 It is a schematic connection view of the moving contact knife and the conductive connection plate provided in the specific implementation manner of the present utility model;

[0043] Figure 11 It is a cross-sectional view of the moving contact device provided in the second embodiment of the present utility model when the moving contact knife is in the second position;

[0044] Figure 12 It is a schematic structural view of the pressure plate provided in the second embodiment of the present utility model.

[0045] In the figure:

[0046] 1. Contact knife holder; 2. Moving contact knife; 3. Elastic component; 4. Contact knife shaft; 5. Sliding shaft;

[0047] 10. Contact knife cavity; 11. First limiting surface; 12. Second limiting surface; 13. Limiting groove; 14. Fitting surface; 15. First rotation hole; 16. Second rotation hole;

[0048] 111. First limiting surface; 112. Second limiting surface;

[0049] 21. First contact knife plate; 22. Second contact knife plate; 23. Moving contact point;

[0050] 211. First end face; 212. Second end face; 213. Arcing starting point; 214. First positioning surface; 215. Second positioning surface; 216. Arc separating surface;

[0051] 221. First sliding surface; 222. Sliding arc surface; 223. Second sliding surface; 224. Arc avoiding groove; 225. Assembly groove; 226. Third limiting surface; 227. Fourth limiting surface; 228. Contact knife hole;

[0052] 31. Pressure plate; 32. Elastic member; 33. Mounting shaft;

[0053] 311. Connecting plate; 312. Guiding plate;

[0054] 3121. First plate segment; 3122. Second plate segment;

[0055] 3121a. First guiding surface; 3123. Guiding arc surface; 3122a. Second guiding surface;

[0056] 3111, First connecting part; 3112, Second connecting part; 3110, Mounting hole

[0057] 100, Conductive connection plate; 110, Clamping space Detailed implementation mode

[0058] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0059] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0060] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0061] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0062] In this embodiment, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this utility model generally indicates that the related objects are in an "or" relationship.

[0063] In the embodiments of the present invention, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted.

[0064] Example 1

[0065] like Figure 1 and Figure 2 As shown, this embodiment provides a moving contact device, including a contact blade seat 1, a moving contact blade 2 and an elastic component 3.

[0066] Among them, see Figure 2 、 Figure 3 as well as Figure 4 The stylus holder 1 is provided with a first limiting surface 11 and a second limiting surface 12. The movable stylus 2 is rotatably mounted on the stylus holder 1 and is located between the first limiting surface 11 and the second limiting surface 12. The movable stylus 2 has a first position and a second position relative to the stylus holder 1 and is rotatable between the first position and the second position. Figure 3 The diagram shows the movable contact blade 2 in the first position, where the movable contact blade 2 is spaced apart from the first limiting surface 11 and has a first gap with the second limiting surface 12 . Figure 2 and Figure 4 The diagram shows the movable contact blade 2 in its second position. The second position is where the movable contact blade 2 abuts the first limiting surface 11 and has a second gap with the second limiting surface 12, which is smaller than the first gap. That is, as the movable contact blade 2 rotates from the first position to the second position, one side of the movable contact blade 2 gradually approaches the first limiting surface 11, while the other side gradually approaches the second limiting surface 12. The elastic component 3 is located between the contact blade holder 1 and the movable contact blade 2. When the current in the circuit in which the movable contact blade 2 is located exceeds a current threshold, the movable contact blade 2 can rotate toward the second position, compressing the elastic component 3. The elastic force of the elastic component 3 allows the movable contact blade 2 to remain in the second position.

[0067] Exemplarily, the second gap is greater than 0 mm and less than 4 mm.

[0068] The contact block 1 is in transmission connection with the circuit breaker's operating mechanism, which drives the contact block 1 to rotate, causing the movable contact 2 to contact or separate from the static contact under the influence of the contact block 1. It should be noted that the movable contact 2 is located in the first position in both the closed and open states and can move under the influence of the contact block 1.

[0069] When a serious fault such as a short circuit occurs in the circuit breaker, a large fault current (the fault current is higher than the current threshold) will generate sufficient repulsive force between the moving contact blade 2 and the static contact, and the moving contact blade 2 will rotate relative to the contact blade seat 1 under the action of the repulsive force, rotating from the first position to the second position.

[0070] During the process of the moving contact blade 2 rotating relative to the contact blade seat 1 from the first position to the second position, it squeezes the elastic component 3 until the moving contact blade 2 abuts against the first limiting surface 11 of the contact blade seat 1, stopping the moving contact blade 2 at the second position and keeping it at the second position under the elastic force of the elastic component 3, effectively limiting the moving contact blade 2 at the second position. Since the moving contact blade 2 squeezes the elastic component 3 during the rotation to the second position, part of the kinetic energy of the moving contact blade 2 is absorbed by the elastic component 3, reducing the impact of the moving contact blade 2 on the first limiting surface 11. At the same time, when the moving contact blade 2 rotates and abuts against the first limiting surface 11, there is a second gap between the moving contact blade 2 and the second limiting surface 12, which will not cause an impact on the second limiting surface 12. After the moving contact blade 2 abuts against the first limiting surface 11, even if the moving contact blade 2 continues to rotate due to inertia to approach the second limiting surface 12 or even abuts against the second limiting surface 12, it will not cause a large impact on the second limiting surface 12, effectively reducing the impact of the moving contact blade 2 on the contact blade seat 1 when it is repelled, avoiding the fracture of the contact blade seat 1 and ensuring the normal use of the circuit breaker.

[0071] See Figure 1 and Figure 5 , multiple moving contact blades 2 are installed on the contact blade seat 1, which are used to drive the multiple moving contact blades 2 to act to realize opening and closing. Exemplarily, three moving contact blades 2 are installed on the contact blade seat 1.

[0072] See Figure 5 and Figure 6 , a contact blade cavity 10 is provided on the contact blade seat 1, and the moving contact blade 2 is rotatably installed in the contact blade cavity 10. The inner wall of the contact blade cavity 10 is provided with the above-mentioned first limiting surface 11 and second limiting surface 12, and the first limiting surface 11 and the second limiting surface 12 are respectively arranged on both sides of the moving contact blade 2.

[0073] See Figure 6 and Figure 7 , a first rotation hole 15 is provided on the inner wall of the contact blade cavity 10 of the contact blade seat 1. See Figure 9 , a contact blade hole 228 is provided on the moving contact blade 2, and a contact blade shaft 4 is used to pass through the contact blade hole 228. The contact blade shaft 4 is installed in the first rotation hole 15, realizing that the moving contact blade 2 is rotatably installed in the contact blade cavity 10 through the contact blade shaft 4, as Figure 2 shown.

[0074] In this embodiment, the elastic component 3 is located on the side of the moving contact blade 2 facing away from the second limiting surface 12. During the process of the moving contact blade 2 rotating from the first position to the second position, the elastic component 3 can provide an elastic force to balance the moving contact blade 2 so as to maintain it in the second position and achieve a self-holding state.

[0075] The elastic component 3 includes a pressing plate 31 and an elastic member 32. Among them, the pressing plate 31 is rotatably connected to the contact blade seat 1, is slidably matched with the moving contact blade 2, and the pressing plate 31 is located on the side of the moving contact blade 2 facing away from the second limiting surface 12. One end of the elastic member 32 abuts against the contact blade seat 1, and the other end abuts against the side of the pressing plate 31 facing away from the moving contact blade 2. When the moving contact blade 2 rotates relative to the contact blade seat 1, the moving contact blade 2 slides and presses the pressing plate 31, and the pressing plate 31 rotates relative to the contact blade seat 1 under the extrusion action and presses the elastic member 32, causing the elastic member 32 to be compressed and deformed. The sliding of the moving contact blade 2 along the pressing plate 31 can improve the stability of the moving contact blade 2 during the process of rotating to the second position.

[0076] Furthermore, in combination with Figure 2 and Figure 8 , the elastic component 3 further includes a mounting shaft 33, and the pressing plate 31 includes a connecting plate 311 and a guiding plate 312. The connecting plate 311 is rotatably connected to the contact blade seat 1 through the mounting shaft 33 to realize the rotation of the entire pressing plate 31 relative to the contact blade seat 1. The guiding plate 312 is connected to the connecting plate 311, and one side of the guiding plate 312 is used for slidable cooperation with the moving contact blade 2, and the other side is used for abutting against the elastic member 32. When the moving contact blade 2 rotates relative to the contact blade seat 1, the moving contact blade 2 slides and presses the guiding plate 312 to cause the connecting plate 311 to rotate adaptively. At the same time, the guiding plate 312 presses the elastic member 32 until the moving contact blade 2 reaches self-balance and achieves a self-holding state.

[0077] In this embodiment, referring to Figure 3 , Figure 4 and Figure 8 , on the side of the guiding plate 312 facing the moving contact blade 2, there are successively connected a first guiding surface 3121a, a guiding arc surface 3123, and a second guiding surface 3122a. The first guiding surface 3121a and the second guiding surface 3122a are arranged at an angle, and the end of the second guiding surface 3122a away from the first guiding surface 3121a extends obliquely towards the direction close to the elastic member 32. And the second guiding surface 3122a is closer to the first limiting surface 11 than the first guiding surface 3121a. The moving contact blade 2 in the first position abuts against the first guiding surface 3121a and / or the guiding arc surface 3123, and when the moving contact blade 2 rotates towards the second position, it slides along the guiding plate 312, and the moving contact blade 2 in the second position abuts against the second guiding surface 3122a and / or the guiding arc surface 3123.

[0078] Exemplarily, referring to Figure 3, the moving contact blade 2 at the first position abuts against the guiding arc surface 3123, and slides along the guiding arc surface 3123 and the second guiding surface 3122a when the moving contact blade 2 rotates towards the second position. See Figure 4 , the moving contact blade 2 at the second position abuts against the second guiding surface 3122a and also abuts against the first limiting surface 11 of the contact blade seat 1. At this time, under the elastic force of the elastic member 32, the pressing plate 31 applies a supporting force to the moving contact blade 2 to achieve self-holding of the moving contact blade 2.

[0079] In this embodiment, both the first guiding surface 3121a and the second guiding surface 3122a are planes, and they are arranged at an obtuse angle and are connected by a guiding arc surface 3123.

[0080] Specifically, the guiding plate 312 includes a first plate segment 3121 and a second plate segment 3122 connected by bending. The first plate segment 3121 is provided with the above-mentioned first guiding surface 3121a, and the second plate segment 3122 is provided with the above-mentioned second guiding surface 3122a. That is, the first guiding surface 3121a and the second guiding surface 3122a arranged at an angle are formed by the first plate segment 3121 and the second plate segment 3122 connected by bending, and the bending part forms the guiding arc surface 3123, which is convenient for processing. One end of the second plate segment 3122 away from the first plate segment 3121 extends obliquely towards the direction close to the elastic member 32, and the elastic member 32 abuts against one side of the first plate segment 3121 facing away from the moving contact blade 2 and / or one side of the second plate segment 3122 facing away from the moving contact blade 2. The first plate segment 3121 and the second plate segment 3122 arranged at an angle can guide the moving contact blade 2 to abut against the first limiting surface 11, and save more space compared with a straight guiding plate 312. Moreover, the first plate segment 3121 and the second plate segment 3122 can provide more space on the side facing the elastic member 32 for arranging the elastic member 32, and at the same time can strengthen the limitation of the elastic member 32.

[0081] See Figure 4 、 Figure 6 and Figure 7 , the contact blade seat 1 is provided with a limiting groove 13. The elastic member 32 is partially located in the limiting groove 13 and can expand and contract along the extending direction of the limiting groove 13 under the extrusion of the pressing plate 31 when the pressing plate 31 rotates. The setting of the limiting groove 13 improves the installation stability of the elastic member 32 on the one hand and can guide it during its expansion and contraction on the other hand. Exemplarily, the elastic member 32 is a spring.

[0082] See Figure 2 and Figure 8, the connecting plate 311 includes a first connecting portion 3111 and two second connecting portions 3112. The first connecting portion 3111 is bent and connected to the guiding plate 312, and the two second connecting portions 3112 are respectively bent and connected to both ends of the first connecting portion 3111. The mounting shaft 33 is rotatably fitted through the two second connecting portions 3112. Mounting holes 3110 are provided on both of the second connecting portions 3112, and the mounting shaft 33 is passed through the mounting holes 3110 on the two second connecting portions 3112. Combining Figure 6 , a second rotation hole 16 is provided on the inner wall of the contact blade cavity 10, and the second rotation hole 16 is used to mount the above-mentioned mounting shaft 33, so that the connecting plate 311 is rotatably connected in the contact blade cavity 10 through the mounting shaft 33.

[0083] Both the guiding plate 312 and the second connecting portion 3112 are bent and connected to the first connecting portion 3111 and extend to the same side of the first connecting portion 3111, which is convenient for assembling the mounting shaft 33 and saves the space occupied by the pressing plate 31.

[0084] Exemplarily, the pressing plate 31 is an integrally formed structure and is formed by processes such as bending, cutting, and punching.

[0085] In this embodiment, referring to Figure 9 , the moving contact blade 2 is provided with a first sliding surface 221, a sliding arc surface 222, and a second sliding surface 223 that are connected in sequence. The first sliding surface 221 and the second sliding surface 223 are arranged at an angle, and one end of the first sliding surface 221 far from the second sliding surface 223 extends obliquely toward the rotation center of the moving contact blade 2 (i.e., the central axis of the contact blade shaft 4). The first sliding surface 221 is closer to the first limiting surface 11 than the second sliding surface 223. Referring to Figure 3 , the moving contact blade 2 at the first position abuts against the pressing plate 31 through the first sliding surface 221. When it rotates to the second position, the first sliding surface 221, the sliding arc surface 222, and the second sliding surface 223 slide along the guiding plate 312 of the pressing plate 31 in sequence. Referring to Figure 4 , the moving contact blade 2 at the second position abuts against the pressing plate 31 through the second sliding surface 223, so that the elastic force of the elastic member 32 can be applied to the second sliding surface 223 of the moving contact blade 2 through the pressing plate 31, and the moving contact blade 2 at the second position abuts against the first limiting surface 11 through the first sliding surface 221, realizing the limiting of the moving contact blade 2 at the second position.

[0086] Exemplarily, both the first sliding surface 221 and the second sliding surface 223 are planes, and they are arranged at an obtuse angle and are connected by the intermediate sliding arc surface 222.

[0087] Referring to Figure 3 and Figure 9, the moving contact blade 2 includes a first contact blade plate 21 and a second contact blade plate 22 that are connected. A moving contact point 23 and an arc separating surface 216 are provided on the first contact blade plate 21. The moving contact point 23 is located at one end of the first contact blade plate 21 away from the second contact blade plate 22, and the arc separating surface 216 is located between the moving contact point 23 and the second contact blade plate 22. The moving contact point 23 is exemplarily a silver contact point, which is used to contact or separate from the static contact in the circuit breaker to realize the on-off of the circuit. The second contact blade plate 22 is rotatably connected to the contact blade cavity 10 of the contact blade seat 1 through a contact blade shaft 4, and is provided with an arc avoiding groove 224 that is recessed relative to the first contact blade plate 21. The arc avoiding groove 224 is located between the first contact blade plate 21 and the rotation center of the second contact blade plate 22 (i.e., the central axis of the contact blade shaft 4), and the arc separating surface 216 of the first contact blade plate 21 is in transitional connection with the inner wall of the arc avoiding groove 224.

[0088] The moving contact blade 2 in the first position abuts against the contact blade seat 1 through the bottom wall of the arc avoiding groove 224. Specifically, the bottom wall of the arc avoiding groove 224 includes a third limiting surface 226. Combining Figure 4 , a fitting surface 14 is provided on the contact blade seat 1. The moving contact blade 2 in the first position abuts against the fitting surface 14 through the third limiting surface 226 to realize the positioning of the moving contact blade 2 in the first position.

[0089] See Figure 3 for the orientation in. When the third limiting surface 226 abuts against the fitting surface 14, there is a height difference between the arc separating surface 216 and the third limiting surface 226. When the arc generated when the moving and static contact points are separated sprays towards the rear end of the moving contact blade 2, the arc can only be guided to the arc separating surface 216 and will not continue to move backward. That is, the setting of the arc avoiding groove 224 can prevent the rear-sprayed arc from being guided to the second contact blade plate 22 and prevent the arc from burning and eroding the rear end of the moving contact blade 2 and the inside of the contact blade seat 1.

[0090] A sliding part protrudes from the side of the second contact blade plate 22 facing away from the second limiting surface 12. The first sliding surface 221, the sliding arc surface 222, and the second sliding surface 223 are all provided on the sliding part.

[0091] See Figure 3 and Figure 9 , one end of the first contact blade plate 21 away from the second contact blade plate 22 has a first end surface 211 and a second end surface 212 that are arranged at an angle, and one end of the first end surface 211 away from the second end surface 212 and one end of the second end surface 212 away from the first end surface 211 both extend obliquely towards the contact blade shaft 4. The connection part of the first end surface 211 and the second end surface 212 forms an arc leading point 213, which is configured to introduce the arc generated at the moment when the moving and static contact points are separated into the arc extinguishing chamber of the circuit breaker to realize the elimination of the arc. The setting of the arc leading point 213 can form a tip that is easy to converge the arc, play a guiding role for the arc, and enable the arc to jump to the arc extinguishing chamber through the arc leading point 213.

[0092] SeeFigure 1 At the rear end of each moving contact blade 2, a conductive connection plate 100 is provided to achieve conductive connection with external leads through the conductive connection plate 100. Refer to Figure 9 and Figure 10 , one end of the second contact blade 22 away from the first contact blade 21 is configured to be clamped in the clamping space 110 of the conductive connection plate 100 to achieve good conductive contact with the conductive connection plate 100. An assembly groove 225 is recessed at the edge of one end of the second contact blade 22 away from the first contact blade 21, which makes it more convenient and smooth for the moving contact blade 2 to be inserted into the clamping space 110 of the conductive connection plate 100 along its extending direction, reducing the assembly difficulty.

[0093] Furthermore, assembly grooves 225 are provided on both side edges of the moving contact blade 2 in the thickness direction.

[0094] Refer to Figure 9 , a first positioning surface 214 and a second positioning surface 215 forming an angle are provided on the first contact blade 21, and a groove for assembling the moving contact 23 is formed between the first positioning surface 214 and the second positioning surface 215. Exemplarily, the moving contact 23 is welded to the first positioning surface 214, and the moving contact 23 abuts against the second positioning surface 215 for positioning during welding.

[0095] Refer to Figure 3 and Figure 4 , a fourth limiting surface 227 is provided on the second contact blade 22 of the moving contact blade 2. During the process of the moving contact blade 2 rotating to the second position, the fourth limiting surface 227 gradually approaches the second limiting surface 12 of the contact blade seat 1. There is a second gap between the moving contact blade 2 rotated to the second position and the second limiting surface 12.

[0096] Refer to Figure 4 , Figure 6 and Figure 7 , the first limiting surface 11 includes a limiting surface one 111 and a limiting surface two 112 connected at an angle. The moving contact blade 2 in the second position abuts against the limiting surface one 111 and / or the limiting surface two 112. One end of the limiting surface two 112 away from the limiting surface one 111 gradually deviates from the moving contact blade 2, which can provide more space to avoid interference with the pressure plate 31. In this embodiment, refer to Figure 4 , the moving contact blade 2 in the second position abuts against the limiting surface one 111 through the first sliding surface 221.

[0097] This embodiment also provides a circuit breaker, which includes a housing, a static contact, an operating mechanism, and the moving contact device as described above. The static contact and the moving contact device are both installed in the housing. The contact blade seat 1 is rotatably connected to the housing and connected to the operating mechanism. The contact blade seat 1 can be driven to rotate by the operating mechanism, and the moving contact blade 2 is used to conductively contact or separate from the static contact under the drive of the contact blade seat 1. The beneficial effects of the circuit breaker with the above moving contact device are as described above.

[0098] Example 2

[0099] Based on the same inventive concept as that of the first embodiment, this embodiment provides a moving contact device and a circuit breaker including the moving contact device. The moving contact device provided in this embodiment differs from that in the first embodiment in that:

[0100] like Figure 11 and Figure 12 As shown, the movable contact device further includes a sliding shaft 5, which is disposed through and connected to the movable contact blade 2 and spaced apart from the rotation center of the movable contact blade 2. That is, the sliding shaft 5 is spaced apart from the contact blade shaft 4. The sliding shaft 5 slidably abuts against the pressure plate 31. When the movable contact blade 2 rotates to the second position, the movable contact blade 2 slides along the guide plate 312 of the pressure plate 31 via the sliding shaft 5, and the guide plate 312 compresses the elastic member 32 until the movable contact blade 2 self-balances and is maintained in the second position under the action of the elastic member 32 and the pressure plate 31.

[0101] Further, see Figure 12 Two guide plates 312 are bent and connected to the connecting plate 311 of the pressure plate 31. A clearance gap is formed between the two guide plates 312 to avoid interference between the movable contact blade 2 and the pressure plate 31. The sliding shaft 5 passes through the movable contact blade 2, and its two ends slide in engagement with the two guide plates 312.

[0102] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A moving contact device, characterized in that, Comprising: A contact knife holder (1) provided with a first limiting surface (11) and a second limiting surface (12); A moving contact knife (2) located between the first limiting surface (11) and the second limiting surface (12), the moving contact knife (2) being rotatably mounted on the contact knife holder (1) between a first position and a second position; the first position is a position where the moving contact knife (2) is spaced from the first limiting surface (11) and has a first gap with the second limiting surface (12); the second position is a position where the moving contact knife (2) abuts against the first limiting surface (11) and has a second gap with the second limiting surface (12), and the second gap is smaller than the first gap; An elastic component (3) located between the contact knife holder (1) and the moving contact knife (2); When the current in the circuit where the moving contact knife (2) is located is higher than the current threshold, the moving contact knife (2) can rotate towards the second position and squeeze the elastic component (3), and the moving contact knife (2) can be maintained at the second position under the elastic force of the elastic component (3).

2. The moving contact device according to claim 1, characterized in that, The elastic component (3) includes: A pressing plate (31) rotatably connected to the contact knife holder (1) and slidably cooperating with the moving contact knife (2), the pressing plate (31) being located on the side of the moving contact knife (2) facing away from the second limiting surface (12); An elastic member (32) having one end abutting against the contact knife holder (1) and the other end abutting against the side of the pressing plate (31) facing away from the moving contact knife (2).

3. The moving contact device according to claim 2, characterized in that, The elastic component (3) further includes a mounting shaft (33), and the pressing plate (31) includes: A connecting plate (311) rotatably connected to the contact knife holder (1) through the mounting shaft (33); A guiding plate (312) connected to the connecting plate (311), the guiding plate (312) abutting against the elastic member (32) and slidably cooperating with the moving contact knife (2).

4. The moving contact device according to claim 3, characterized in that, On the side of the guiding plate (312) facing the moving contact knife (2), there are sequentially connected a first guiding surface (3121a), a guiding arc surface (3123), and a second guiding surface (3122a); the first guiding surface (3121a) and the second guiding surface (3122a) are arranged at an angle, and the end of the second guiding surface (3122a) away from the first guiding surface (3121a) extends obliquely towards the direction close to the elastic member (32); The moving contact knife (2) in the first position abuts against the first guiding surface (3121a) and / or the guiding arc surface (3123), and the moving contact knife (2) in the second position abuts against the second guiding surface (3122a) and / or the guiding arc surface (3123).

5. The moving contact device according to claim 4, characterized in that, The guiding plate (312) includes a first plate segment (3121) and a second plate segment (3122) that are bent and connected; the first plate segment (3121) is provided with the first guiding surface (3121a), the second plate segment (3122) is provided with the second guiding surface (3122a), and the elastic member (32) abuts against the first plate segment (3121) and / or the second plate segment (3122); And / or, the connecting plate (311) includes a first connecting portion (3111) and two second connecting portions (3112), the first connecting portion (3111) is bent and connected to the guiding plate (312), the two second connecting portions (3112) are respectively bent and connected to both ends of the first connecting portion (3111), and the mounting shaft (33) is rotatably fitted through the two second connecting portions (3112).

6. The moving contact device according to claim 2, characterized in that, The moving contact blade (2) is provided with a first sliding surface (221), a sliding arc surface (222), and a second sliding surface (223) that are connected in sequence; the first sliding surface (221) and the second sliding surface (223) are arranged at an angle, and one end of the first sliding surface (221) away from the second sliding surface (223) extends obliquely toward the rotation center of the moving contact blade (2); The moving contact blade (2) at the first position abuts against the pressing plate (31) through the first sliding surface (221), the moving contact blade (2) at the second position abuts against the pressing plate (31) through the second sliding surface (223), and abuts against the first limiting surface (11) through the first sliding surface (221).

7. The moving contact device according to claim 2, characterized in that, The moving contact device further includes a sliding shaft (5), the sliding shaft (5) is connected to the moving contact blade (2) and is spaced from the rotation center of the moving contact blade (2), and the sliding shaft (5) slidably abuts against the pressing plate (31).

8. The moving contact device according to claim 2, characterized in that, The contact blade seat (1) is provided with a limiting groove (13), a part of the elastic member (32) is located in the limiting groove (13), and can expand and contract along the extending direction of the limiting groove (13) when the pressing plate (31) rotates.

9. The moving contact device according to any one of claims 1-8, characterized in that, The moving contact blade (2) includes a first contact blade plate (21) and a second contact blade plate (22) that are connected; one end of the first contact blade plate (21) away from the second contact blade plate (22) is provided with a moving contact point (23); the second contact blade plate (22) is rotatably connected to the contact blade seat (1), and is provided with an arc avoiding groove (224) that is recessed relative to the first contact blade plate (21), the arc avoiding groove (224) is located between the rotation centers of the first contact blade plate (21) and the second contact blade plate (22), and the moving contact blade (2) at the first position abuts against the contact blade seat (1) through the bottom wall of the arc avoiding groove (224); And / or, one end of the moving contact blade (2) is provided with a moving contact point (23), and the other end is configured to be clamped in the clamping space (110) of the conductive connection plate (100), and an assembly groove (225) is recessed at the edge of the other end of the moving contact blade (2); And / or, one end of the moving contact blade (2) extending out of the contact blade seat (1) has a first end face (211) and a second end face (212) arranged at an included angle, and an arcing point (213) is formed at the connection of the first end face (211) and the second end face (212), and the arcing point (213) is configured to introduce an electric arc into the arc extinguishing chamber of the circuit breaker.

10. A circuit breaker, characterized in that, It includes a housing, a static contact, and a moving contact device according to any one of claims 1-9. The static contact and the moving contact device are installed in the housing. The contact blade seat (1) is rotatably connected to the housing, and the moving contact blade (2) is used to conductively contact or separate from the static contact under the drive of the contact blade seat (1).

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