Contact support mechanism for an ac contactor
Patent Information
- Application Number
- CN202611236922.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-14
- Publication Date
- 2026-10-30
AI Technical Summary
[0003]因此，本发明要解决的技术问题在于克服现有技术中动触点和静触点在长时间不接触后，触点容易氧化后，出现不导通的缺陷，从而提供一种能够保证动触片和静触片接触时处于导通状态的交流接触器的触头支持机构
1.本发明提供的一种交流接触器的触头支持机构，动触片和静触片依托倾斜轨迹运动产生的切向微小滑动，能够在每次合闸过程中自动挫除触头表面的氧化层、硫化层与附着异物，从根源上避免触头因为氧化导致的接触不良问题，无需额外增加密封结构或贵金属镀层，即可大幅提升辅助触头的导通可靠性，通过多个接触点的设置，每个独立的接触点的边缘都可充当微型刮削刃，在合闸切向滑动过程中，可从多个方向同步挫除触头表面的氧化层、硫化层，相比单触点结构，氧化层清除覆盖率更高，并且即使单个接触点表面附着粉尘、金属飞溅物，其余接触点仍可避开异物完成有效接触，不会因单点异物直接导致整个回路接触失效，有效的提高了动触片和静触片之间的导电性能。
Smart Images
Figure CN123017795A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of AC contactor technology, and more specifically to a contact support mechanism for an AC contactor. Background Technology
[0002] The contact support of an AC contactor is an insulated mechanical component that supports the moving contact and the electromagnetic transmission mechanism. It ensures synchronous operation of multi-phase contacts, precise switching of circuits, and phase-to-phase electrical isolation, thereby improving the operational stability and service life of the contact system. The contact support is mainly divided into main contacts and auxiliary contacts, each with different functions: main contacts are mainly used to connect and disconnect the main circuit and can carry a large current, typically used to control the operation of equipment such as motors; auxiliary contacts are mainly used for signal transmission and logic control of the control circuit and carry a smaller current. In existing technology, after a long period of non-contact, the moving and stationary contacts of the auxiliary contacts are prone to oxidation, which increases resistance and causes the contact surface temperature to become too high, turning surface contact into point contact, or even causing non-conduction. Summary of the Invention
[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the moving contact and the stationary contact are prone to oxidation after a long period of non-conduction, and thus provide a contact support mechanism for an AC contactor that can ensure that the moving contact and the stationary contact are in a conductive state when they are in contact.
[0004] To address this, the present invention provides a contact support mechanism for an AC contactor. The AC contactor includes a housing, and the contact support mechanism is fixed inside the housing. The contact support mechanism includes an auxiliary contact assembly, which includes a body, a moving contact piece disposed on the body, and a stationary contact piece capable of opening and closing the circuit with the moving contact piece. The moving contact piece and the stationary contact piece move along an inclined trajectory during the opening and closing process. The moving contact piece is provided with a moving contact point, and the stationary contact piece is provided with a stationary contact point. The movement path of the moving contact point toward or away from the stationary contact point always maintains a short-distance straight-line trend, and it remains perpendicular to the surface of the stationary contact point throughout the entire movement. The contact end surfaces of the moving contact point and / or the stationary contact point are provided with multiple contact points.
[0005] Furthermore, the contact end surfaces of the moving contact and / or stationary contact are provided with conductive strips arranged alternately in the transverse and longitudinal directions, and multiple conductive strips are interconnected and enclosed on the surface to form several uniformly distributed heat dissipation grooves.
[0006] Furthermore, the contact end surfaces of the moving contact and / or stationary contact as a whole constitute a waffle-like grid-shaped contact surface.
[0007] Furthermore: the main body is provided with an upper boss and a lower boss for assisting the moving contact piece to move along an inclined trajectory. The upper boss and the lower boss are respectively located at the two ends of the inclined trajectory, and a spring is provided between the moving contact piece and the upper boss.
[0008] Furthermore: an inclined guide block is provided on one or both sides of the inner wall of the main body; a guide groove is provided on the moving contact piece, and the extension direction of the inclined guide block is completely matched with the preset inclined movement trajectory of the moving contact piece. During the opening and closing operation, the guide groove guides the moving contact piece as a whole to complete the opening and closing operation along the preset inclined path.
[0009] Furthermore, the movable contact piece is provided with outwardly extending limiting protrusions, which are located at the two sides of the guide groove and slide along the groove wall of the inclined guide block throughout the entire process.
[0010] Furthermore, the upper end of the inclined guide block is provided with an anti-detachment block that abuts against the limiting protrusion.
[0011] Furthermore: a positioning block is provided at the upper boss to prevent the spring from falling out, the upper part of the spring is sleeved on the outside of the positioning block, and the lower part of the spring is located between the two limiting protrusions.
[0012] Furthermore: the stationary contact piece is fixed inside the housing, and a terminal block is connected to the side of the stationary contact piece facing away from the moving contact piece.
[0013] The technical solution of this invention has the following advantages: 1. The present invention provides a contact support mechanism for an AC contactor. The moving and stationary contacts rely on the tangential micro-sliding generated by the inclined trajectory movement to automatically remove the oxide layer, sulfide layer and attached foreign matter from the contact surface during each closing process. This fundamentally avoids contact problems caused by oxidation of the contacts. It can significantly improve the conductivity reliability of the auxiliary contacts without the need for additional sealing structures or precious metal plating. By setting multiple contact points, the edge of each independent contact point can act as a micro-scraping blade. During the tangential sliding process of closing, the oxide layer and sulfide layer on the contact surface can be removed simultaneously from multiple directions. Compared with the single contact point structure, the oxide layer removal coverage is higher. Even if dust or metal spatter adheres to the surface of a single contact point, the other contact points can still avoid foreign matter and complete effective contact. The contact failure of the entire circuit will not be directly caused by a single point of foreign matter, effectively improving the conductivity between the moving and stationary contacts.
[0014] 2. The contact support mechanism of the AC contactor provided by the present invention forms multiple contact points at the intersection of conductive strips, and multiple parallel conductive paths are formed between the conductive strips. In this way, even if a single contact point fails due to wear and becomes poorly connected, the remaining contact points can still conduct the circuit normally. This can significantly reduce the probability of the control circuit being accidentally disconnected. Moreover, the use of a waffle-like grid-type contact surface can disperse the electric arc generated when the moving and stationary contacts open and close the circuit to multiple contact points, preventing the local area of a single contact point from being concentrated and burned. This significantly reduces the degree of arc erosion of a single contact point and effectively extends the electrical service life of the contacts. The heat dissipation grooves formed between adjacent contact points can effectively increase the heat dissipation area and accelerate the heat dissipation of the moving and stationary contacts. Attached Figure Description
[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the overall structure of an AC contactor. Figure 2 This is a schematic diagram of the cross-sectional structure of an AC contactor; Figure 3 A three-dimensional cross-sectional structural diagram of an AC contactor; Figure 4 for Figure 3 Enlarged view of section A in the middle; Figure 5 A schematic diagram of the structure supporting the contact; Figure 6 for Figure 5 Enlarged structural diagram of the moving contact; Figure 7 This is a schematic diagram of the structure supporting the contacts.
[0017] Explanation of reference numerals in the attached figures: 1. Housing; 2. Auxiliary contact assembly; 21. Body; 22. Moving contact piece; 23. Stationary contact piece; 24. Moving contact; 25. Stationary contact; 3. Conductive strip; 31. Heat dissipation groove; 4. Upper boss; 41. Lower boss; 5. Spring; 6. Inclined guide block; 61. Guide groove; 7. Limiting protrusion; 8. Anti-disengagement block; 9. Positioning block; 91. Terminal block. Detailed Implementation
[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0021] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0022] Example This embodiment provides a contact support mechanism for an AC contactor. The AC contactor includes a housing 1, and the contact support mechanism is fixed inside the housing 1. The contact support mechanism includes an auxiliary contact assembly 2, which includes a body 21, a moving contact piece 22 disposed on the body 21, and a stationary contact piece 23 capable of opening and closing the circuit with the moving contact piece 22. The moving contact piece 22 and the stationary contact piece 23 move along an inclined trajectory during the opening and closing process. The moving contact piece 22 is provided with a moving contact point 24, and the stationary contact piece 23 is provided with a stationary contact point 25. The movement path of the moving contact point 24 toward or away from the stationary contact point 25 always maintains a short-distance straight-line trend, and is perpendicularly aligned with the surface of the stationary contact point 25 throughout the entire process. The contact end surfaces of the moving contact point 24 and / or the stationary contact point 25 are provided with multiple contact points.
[0023] The specific improvements mentioned above are as follows: Figures 1-4As shown, compared to existing technologies, the moving contact 22 and the stationary contact 23 rely on the tangential micro-sliding generated by the inclined trajectory movement to automatically remove the oxide layer, sulfide layer and attached foreign matter from the contact surface during each closing process, avoiding contact problems caused by oxidation. Without the need for additional sealing structures or precious metal plating, the conductivity reliability of the auxiliary contact can be greatly improved. By setting multiple contact points, the edge of each independent contact point can act as a micro-scraping blade. During the tangential sliding process of closing, the oxide layer and sulfide layer on the contact surface can be removed simultaneously from multiple directions. Compared with the single contact point structure, the oxide layer removal coverage is higher. Even if dust or metal splashes are attached to the surface of a single contact point, the other contact points can still avoid foreign matter and complete effective contact. The contact failure of the entire circuit will not be directly caused by a single point of foreign matter. This effectively improves the conductivity between the moving contact 22 and the stationary contact 23. In this embodiment, the inclination direction and angle of the inclined trajectory are set to 68°-80°, and the preferred included angle can be set to 70°-72°.
[0024] Based on the above embodiments: the contact end surfaces of the moving contact 24 and / or the stationary contact 25 are provided with conductive strips 3 arranged alternately in the transverse and longitudinal directions, and the multiple conductive strips 3 are interconnected and enclosed on the surface to form a number of evenly distributed heat dissipation grooves 31.
[0025] Based on the above embodiments: the contact end surfaces of the moving contact 24 and / or the stationary contact 25 are integrally formed into a waffle-like grid-shaped contact surface.
[0026] The specific improvements mentioned above are as follows: Figures 5-7 As shown, multiple contact points are formed at the intersection of the conductive strips 3, and multiple parallel conductive paths are formed between the conductive strips 3. In this way, even if a single contact point fails due to wear and becomes poorly connected, the remaining contact points can still conduct the circuit normally. This can significantly reduce the probability of the control circuit being accidentally disconnected. Moreover, by adopting a waffle-like grid-type contact surface, the electric arc generated by the opening and closing of the moving contact 22 and the stationary contact 23 will be dispersed among multiple contact points, and will not concentrate on burning the local area of a single contact point. This significantly reduces the degree of arc erosion of a single contact point and effectively extends the electrical life of the contacts. The heat dissipation grooves 31 formed between adjacent contact points can effectively increase the heat dissipation area and accelerate the heat dissipation of the moving contact 24 and the stationary contact 25.
[0027] Based on the above embodiments: the main body 21 is provided with an upper boss 4 and a lower boss 41 for assisting the moving contact piece 22 to move along an inclined trajectory. The upper boss 4 and the lower boss 41 are respectively located at the two ends of the inclined trajectory. A spring 5 is provided between the moving contact piece 22 and the upper boss 4.
[0028] The specific improvements mentioned above are as follows: Figure 7As shown, the upper boss 4 and the lower boss 41 are respectively set at the two ends of the inclined trajectory, which can directly limit the travel boundaries of the moving contact 22 at the two extreme positions of opening and closing, so as to prevent the moving contact 22 from moving beyond the travel range and deviating, and ensure that the moving contact 24 moves along the preset inclined trajectory throughout the entire process, without the problem of vertical alignment failure caused by trajectory deviation. The spring 5 set between the moving contact 22 and the upper boss 4 can provide continuous and stable elastic compensation pressure after closing. Even if the contact wears slightly after long-term use, the spring 5 can still automatically compensate for the wear, ensuring that the contact pressure between the moving and stationary contacts 25 is always maintained within the design threshold range, and there will be no problem of insufficient contact pressure or increased contact resistance due to contact wear.
[0029] Based on the above embodiments: an inclined guide block 6 is provided on one or both sides of the inner wall of the main body 21; a guide groove 61 is provided on the moving contact piece 22, and the extension direction of the inclined guide block 6 is completely matched with the preset inclined motion trajectory of the moving contact piece 22. During the opening and closing operation, the guide groove 61 guides the moving contact piece 22 as a whole to complete the opening and closing operation along the preset inclined path.
[0030] The specific improvements mentioned above are as follows: Figure 7 As shown, the cooperation between the guide groove 61 and the inclined guide block 6 can form a double-sided limiting constraint on the moving contact piece 22. In the scenario where the contactor is subjected to whole machine vibration and closing impact, the moving contact piece 22 will not have the problem of accidental loosening or misalignment.
[0031] Based on the above embodiments: the movable contact piece 22 is provided with an outwardly extending limiting protrusion 7, which is located at both sides of the guide groove 61 and slides along the groove wall of the inclined guide block 6 throughout its entire length.
[0032] The specific improvements mentioned above are as follows: Figure 7 As shown, by setting the limiting protrusion 7, the two sides of the guide groove 61 of the moving contact piece 22 can directly form a precise sliding fit with the groove wall of the inclined guide block 6 through the limiting protrusion 7, avoiding the problem of one-sided jamming and left-right movement of the guide groove 61 and the guide block during the movement, maintaining the coaxiality of the inclined movement of the moving contact piece 22 throughout the process, further enhancing the vertical alignment accuracy of the moving contact 24 and the stationary contact 25, and greatly improving the movement stability and mechanical service life of the entire contact support mechanism.
[0033] Based on the above embodiments: the upper end of the inclined guide block 6 is provided with an anti-detachment block 8 that abuts against the limiting protrusion 7.
[0034] The specific improvements mentioned above are as follows: Figure 7As shown, the anti-detachment block 8 is located at the upper end of the inclined guide block 6, and can directly form an axial abutment constraint with the limiting protrusion 7 on the moving contact piece 22, so as to prevent the moving contact piece 22 from accidentally sliding out and falling off from the upper opening of the inclined guide block 6 during assembly, transportation or large vibration, and completely solve the problem of contact function failure caused by the loosening and misalignment of the moving contact piece 22.
[0035] Based on the above embodiment: a positioning block 9 is provided at the upper boss 4 to prevent the spring 5 from falling out, the upper part of the spring 5 is sleeved on the outside of the positioning block 9, and the lower part of the spring 5 is located between the two limiting protrusions 7.
[0036] The specific improvements mentioned above are as follows: Figure 7 As shown, the upper end of the spring 5 is directly sleeved on the outside of the positioning block 9 of the upper boss 4, and the lower end is inserted between the two limiting protrusions 7 of the moving contact piece 22, so as to realize the bidirectional gapless limiting of the upper and lower ends of the spring 5, completely avoiding the problems of displacement, skewness and detachment of the spring 5 during long-term high-frequency extension and contraction vibration, and preventing serious faults such as contact pressure failure and inability of the contact to close due to the spring 5 falling off.
[0037] Based on the above embodiments: the stationary contact piece is fixed inside the housing 1, and a terminal 91 is connected to the side of the stationary contact piece facing away from the moving contact piece.
[0038] The specific improvements mentioned above are as follows: the stationary contact 23 is directly fixed inside the housing 1, and the side facing away from the moving contact 22 is directly connected to the terminal 91, eliminating the intermediate connecting conductive component between the stationary contact 23 and the terminal 91 in the traditional structure, which greatly reduces the contact resistance of the circuit, reduces the additional heat generation during the conduction process, and further helps to reduce the overall steady-state temperature rise of the contact.
[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A contact support mechanism for an AC contactor, the AC contactor including a housing (1), the contact support mechanism being fixed inside the housing (1), the contact support mechanism including an auxiliary contact assembly (2), characterized in that: The auxiliary contact assembly (2) includes a body (21), a movable contact piece (22) disposed on the body (21), and a stationary contact piece (23) capable of opening and closing the circuit with the movable contact piece (22). The movable contact piece (22) and the stationary contact piece (23) move along an inclined trajectory during the opening and closing process. The movable contact piece (22) is provided with a movable contact point (24), and the stationary contact piece (23) is provided with a stationary contact point (25). The movement path of the movable contact point (24) towards or away from the stationary contact point (25) always maintains a short-distance straight-line trend, and it is perpendicularly aligned with the surface of the stationary contact point (25) throughout the entire process. The contact end surfaces of the movable contact point (24) and / or the stationary contact point (25) are provided with multiple contact points.
2. The contact support mechanism for an AC contactor according to claim 1, characterized in that: The contact end surfaces of the moving contact (24) and / or the stationary contact (25) are provided with conductive strips (3) arranged alternately in the transverse and longitudinal directions. Multiple conductive strips (3) are interconnected and enclosed on the surface to form several uniformly distributed heat dissipation grooves (31).
3. The contact support mechanism for an AC contactor according to claim 2, characterized in that: The contact end surfaces of the moving contact (24) and / or the stationary contact (25) together form a waffle-like grid-shaped contact surface.
4. The contact support mechanism of an AC contactor according to claim 2 or 3, characterized in that: The main body (21) is provided with an upper boss (4) and a lower boss (41) for assisting the moving contact piece (22) to move along an inclined trajectory. The upper boss (4) and the lower boss (41) are respectively located at the two ends of the inclined trajectory. A spring (5) is provided between the moving contact piece (22) and the upper boss (4).
5. A contact support mechanism for an AC contactor according to any one of claims 1-3, characterized in that: An inclined guide block (6) is provided on one or both sides of the inner wall of the main body (21); a guide groove (61) is provided on the moving contact piece (22). The extension direction of the inclined guide block (6) is completely matched with the preset inclined motion trajectory of the moving contact piece (22). During the opening and closing operation, the guide groove (61) guides the moving contact piece (22) to complete the opening and closing operation along the preset inclined path.
6. The contact support mechanism for an AC contactor according to claim 4, characterized in that: The movable contact piece (22) is provided with an outwardly extending limiting protrusion (7), which is located at both sides of the guide groove (61) and slides along the groove wall of the inclined guide block (6) throughout its entire length.
7. The contact support mechanism for an AC contactor according to claim 6, characterized in that: The inclined guide block (6) is provided with an anti-detachment block (8) at the upper end, which abuts against the limiting protrusion (7).
8. The contact support mechanism for an AC contactor according to claim 6, characterized in that: A positioning block (9) is provided at the upper protrusion (4) to prevent the spring (5) from falling out. The upper part of the spring (5) is sleeved on the outside of the positioning block (9), and the lower part of the spring (5) is located between the two limiting protrusions (7).
9. The contact support mechanism for an AC contactor according to claim 1, characterized in that: The stationary contact is fixed inside the housing (1), and a terminal block (91) is connected to the side of the stationary contact facing away from the moving contact.