Auxiliary contact structure of contactor
By enhancing the resistance to foreign matter and oxidation of the auxiliary contacts of the AC contactor through a four-contact connection design and a knurled structure, the problem of unreliable conduction caused by foreign matter, oxidation or wear is solved, resulting in higher reliability and lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-27
AI Technical Summary
The auxiliary contacts of existing AC contactors are prone to failure to conduct due to foreign objects, oxidation, or wear and eccentricity, which reduces the reliability of the auxiliary circuit connection.
Design a contactor auxiliary contact structure with a four-contact connection design. The surfaces of the moving and stationary contacts are decorated with a matrix or honeycomb knitted structure, and limiting bending angles are set on both sides of the moving contact bridge. The multi-point redundancy and knitted structure enhance the resistance to foreign matter and oxidation, and reduce the contact resistance.
It improves the contact's resistance to foreign matter, oxidation, and wear, ensures reliable conduction of weak current, reduces contact resistance and heat generation, extends lifespan, adapts to complex working conditions, and improves system reliability.
Smart Images
Figure CN224053097U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to low voltage electric appliance technical field, concretely relates to a contactor auxiliary contact structure. BACKGROUND
[0002] As a kind of control electric appliance, contactor is mainly used in control circuit, remote connection, breaking circuit and control motor starting, stopping, running breaking etc. According to the different carrying current, AC contactor can be divided into main circuit and auxiliary circuit. Among them, auxiliary circuit mainly relies on auxiliary contact (including dynamic, static auxiliary contact) to connect and break auxiliary circuit current. Auxiliary contact is connected in the auxiliary circuit of switch electric appliance and is operated by mechanical method, and auxiliary contact is mainly used in remote control in control circuit, to reduce installation size, improve product performance, most of the main bodies of AC contactor currently are provided with auxiliary contact. But because the working voltage of auxiliary contact is low, and the current is small, when the surface of dynamic, static auxiliary contact has foreign matter or the contact is oxidized or eccentric wear, it will easily appear not to conduct, its contact resistance will be large, leading to the reduction of auxiliary circuit connection reliability, so that auxiliary contact cannot effectively transmit conducting signal, and the situation of auxiliary contact has become the weakest link of AC contactor reliability, which is urgently needed to be solved by the present technical personnel in the field. SUMMARY
[0003] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the surface of auxiliary contact of contactor has foreign matter or the contact is oxidized or eccentric wear, which will easily appear not to conduct, leading to the reduction of auxiliary circuit connection reliability.
[0004] To solve the above technical problem, the utility model provides a kind of contactor auxiliary contact structure, including at least one group of auxiliary dynamic contact assembly that is movably arranged in the contactor shell by contact support, and at least one group of auxiliary static contact assembly that is fixedly arranged in the contactor shell corresponding to auxiliary dynamic contact assembly, each group of auxiliary dynamic contact assembly includes one auxiliary dynamic contact bridge that is arranged on the contact support, and two pairs of dynamic contact parts that are respectively formed in parallel on both ends of the auxiliary dynamic contact bridge;Each group of auxiliary static contact assembly includes two auxiliary static contact bridges that are oppositely arranged in the contactor shell, and two pairs of static contact parts that are respectively formed in parallel on the opposite end of the two auxiliary static contact bridges, two pairs of dynamic contact parts are respectively arranged on the movement path of two pairs of dynamic contact parts, and four connection points for current passing are formed when two pairs of dynamic contact parts and two pairs of static contact parts are contacted.
[0005] As a preferred scheme, each pair of dynamic contact part includes two dynamic contact pieces that are spaced apart and formed on one end of auxiliary dynamic contact bridge, and two dynamic contact points arranged on the two dynamic contact pieces.
[0006] As a preferred solution, each pair of the static contact head part comprises two static contact sheets which are spaced and shaped at one end of the auxiliary static contact bridge, and two static contact points which are arranged on the two static contact sheets.
[0007] As a preferred solution, each pair of the dynamic contact head part and each pair of the static contact head part correspondingly contact to form a parallel double-circuit channel, the dynamic contact point is welded in the film to the dynamic contact sheet, and the static contact point is welded in the film to the static contact sheet.
[0008] As a preferred solution, the dynamic contact point and the static contact point are respectively provided with a matrix-shaped or honeycomb-shaped undercut structure.
[0009] As a preferred solution, the undercut structure comprises a plurality of undercut grooves which are arranged in a matrix on the surface of the dynamic contact point or the static contact point, and a vertical and horizontal contact surface which is distributed between the plurality of undercut grooves.
[0010] As a preferred solution, the undercut structure comprises a plurality of undercut protrusions which are arranged in a matrix on the surface of the dynamic contact point or the static contact point, and a vertical and horizontal groove which is distributed between the plurality of undercut protrusions.
[0011] As a preferred solution, the contact support is provided with a contact hole for mounting the auxiliary dynamic contact assembly, the auxiliary dynamic contact bridge is mounted in the contact hole and drives two pairs of dynamic contact head parts to respectively extend on both sides of the contact hole, and a limiting structure is arranged between the auxiliary dynamic contact bridge and the contact hole, the limiting structure comprises two groups of limiting bent angles which are bent and shaped on the side edges of the auxiliary dynamic contact bridge, and two groups of limiting stop walls which are correspondingly arranged on the side walls of the contact hole and cooperate with the two groups of limiting bent angles.
[0012] As a preferred solution, the limiting bent angle is a circular arc angle structure, and the bending angle is an obtuse angle.
[0013] As a preferred solution, the auxiliary dynamic contact assembly comprises an auxiliary contact spring which is arranged in the contact hole and contacts the auxiliary dynamic contact bridge, the middle part of the auxiliary dynamic contact bridge forms a positioning area between the two groups of limiting bent angles, the contact hole is provided with a positioning block which is opposite to the positioning area, and the two ends of the auxiliary contact spring are respectively positioned in the positioning area and the positioning block.
[0014] Compared with the prior art, the technical scheme of the utility model has the following advantages:
[0015] 1. The auxiliary contact structure of the contactor provided by the utility model has the following advantages: first, the anti-foreign matter / anti-oxidation / corrosion ability is improved, and the contact action reliability is improved; even if a contact point fails to contact due to foreign matter on the surface or fails to contact due to the formation of a high-resistance layer due to oxidation or corrosion, the remaining contact points can still be conducted through the other three contact points, and the probability of overall failure due to foreign matter or oxidation or corrosion is greatly reduced; second, the contact resistance is reduced, and the heat generation is reduced; when the four contact points are simultaneously conducted, the current is evenly distributed to each contact point, the current-carrying capacity of a single contact point is reduced, the contact resistance is reduced, and thus the heat generation of the contact point and the energy loss are reduced; third, the anti-wear and anti-eccentricity ability is improved; in a mechanical vibration or impact scene, the multi-contact point design can avoid the mis-disconnection caused by instantaneous disconnection, improve the anti-interference ability of the system, adapt to complex working conditions, and greatly improve the conduction performance and reliability of the product.
[0016] 2. The auxiliary contact structure of the contactor provided by the utility model has the following advantages: the four-contact point conduction design of the auxiliary contact can ensure the reliable conduction of weak current, avoid signal loss caused by poor contact, and has a significantly longer overall life than the traditional design, thereby reducing the maintenance frequency and replacement cost; in conclusion, the core of the four-contact point design of the auxiliary contact is the multi-point redundancy, load sharing and fault tolerance mechanism, which effectively solves the unreliable conduction problem caused by oxidation, foreign matter, wear or eccentricity of the traditional auxiliary contact, can be applied to industrial scenes with high requirements for control loop stability, and meets the user's usage requirements.
[0017] 3. The auxiliary contact structure of the contactor provided by the utility model has the following advantages: the matrix or honeycomb arrangement of the active and passive contact surfaces of the auxiliary contact is designed as a bite flower structure; the bite flower structure and foreign matter produce local high-pressure contact when the contact is closed, and the foreign matter or oxide film can be scraped off and extruded out of the contact area, thereby reducing the risk of short circuit or poor contact; the bite flower groove or channel design can provide temporary storage space for foreign matter, avoid the direct accumulation of foreign matter on the surface of the key contact point, reduce the risk of short circuit or poor contact, effectively remove the dirt and oxide layer on the surface of the contact point, reduce the film resistance of the contact, and greatly improve the conduction performance of the contact.
[0018] 4. The auxiliary contact structure of the contactor, two groups of limiting bending angles are designed as limiting structures on the two sides of the auxiliary movable contact, the limiting bending angle is an arc angle structure, the advantages of this design are that the risk of distortion of the auxiliary movable contact can be reduced when the auxiliary movable contact is frequently started and stopped or subjected to external force, the limiting installation effect on the contact support is achieved, and the wear between the auxiliary movable contact and the contact support can be reduced through the arc designed bending angle, when the arc bending surface of the limiting bending angle contacts the contact support, the pressure distribution is more uniform, local wear is avoided, friction is more uniform when the contact reciprocates, and the mechanical properties, motion stability and service life of the auxiliary movable contact are improved.
[0019] 5. The auxiliary contact structure of the contactor, a positioning area is formed between the two groups of limiting bending angles in the middle of the auxiliary movable contact bridge, one end of the auxiliary contact spring is positioned and installed in the positioning area, the auxiliary contact spring in the positioning area is positioned and installed through the two groups of limiting bending angles, the arc bending surface of the limiting bending angle can reduce wear and prolong the service life when contacting the auxiliary contact spring, and the stability and reliability of the installation and contact of the auxiliary contact spring are ensured. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced.
[0021] Figure 1 It is a cross-sectional structure schematic view of the auxiliary contact structure of the contactor of the present application.
[0022] Figure 2 It is an installation structure schematic view of the auxiliary contact structure of the contactor of the present application.
[0023] Figure 3 It is an installation structure schematic view of the auxiliary movable contact assembly of the present application.
[0024] Figure 4 It is a structure schematic view of the auxiliary movable contact bridge of the present application.
[0025] Figure 5 It is a structure schematic view of the auxiliary movable contact bridge in another direction of the present application.
[0026] Figure 6 It is a structure schematic view of the auxiliary static contact bridge of the present application.
[0027] Explanation of reference signs: 1, auxiliary moving contact bridge; 10, moving contact head; 11, moving contact piece; 12, moving contact point; 13, positioning area; 2, auxiliary static contact bridge; 20, static contact head; 21, static contact piece; 22, static contact point; 3, undercut structure; 31, undercut groove; 32, longitudinal and transverse contact surface; 4, limiting bent corner; 5, auxiliary contact spring; 6, contactor shell; 7, contact support; 8, limiting stop wall. DETAILED DESCRIPTION
[0028] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0029] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0030] EMBODIMENT
[0031] The present embodiment provides a contactor auxiliary contact structure as shown in Figures 1-6 The auxiliary contact can be divided into normally open auxiliary contact and normally closed auxiliary contact. Each auxiliary moving contact assembly includes an auxiliary moving contact bridge 1 passing through the contact support 7, and two pairs of moving contact heads 10 respectively parallel extending on both ends of the auxiliary moving contact bridge 1. Each auxiliary static contact assembly includes two auxiliary static contact bridges 2 oppositely arranged on the contactor shell 6, and two pairs of static contact heads 20 respectively parallel extending on one end of the two auxiliary static contact bridges 2 opposite to each other. The two pairs of static contact heads 20 are respectively arranged on the movement path of the two pairs of moving contact heads 10. When the two pairs of moving contact heads 10 and the two pairs of static contact heads 20 are matched and contacted, four through points for passing current are formed, that is, each pair of the moving contact heads 10 and each pair of the static contact heads 20 are correspondingly contacted to form a double-circuit channel in parallel, so that the auxiliary moving contact assembly and the auxiliary static contact assembly of each group are connected to form an auxiliary circuit with four contact points.
[0032] The above embodiment is the core technical solution of the present embodiment. Two pairs of moving contact heads 10 are respectively formed in parallel at both ends of the auxiliary moving contact bridge 1, and two pairs of static contact heads 20 are respectively formed in parallel at opposite ends of the two auxiliary static contact bridges 2. When the two pairs of moving contact heads 10 and the two pairs of static contact heads 20 are in contact, an auxiliary circuit with four-contact connection is formed between the auxiliary moving contact bridge 1 and the two auxiliary static contact bridges 2. The auxiliary contact head has the following advantages: first, the anti-foreign matter / anti-oxidation / corrosion ability is improved, and the contact action reliability is improved. Even if a contact point fails to contact due to foreign matter on the surface or fails to contact due to oxidation or corrosion to form a high-resistance layer, the remaining contact points can still be connected through the other three contact points, greatly reducing the probability of overall failure due to foreign matter or oxidation or corrosion. Second, the contact resistance is reduced, and the heat generation is reduced. When the four contact points are connected at the same time, the current is evenly distributed to each contact point, the current-carrying capacity of a single contact point is reduced, the contact resistance is reduced, and thus the heat generation and energy loss of the contact point are reduced. Third, the anti-wear and anti-eccentricity ability is improved. In a mechanical vibration or impact scene, the multi-contact point design can avoid mis-disconnection caused by instantaneous disconnection, improve the anti-interference ability of the system, adapt to complex working conditions, and greatly improve the connection performance and reliability of the product.
[0033] Further preferably, each pair of the moving contact heads 10 includes two moving contact pieces 11 spaced apart and formed at one end of the auxiliary moving contact bridge 1, and two moving contact points 12 arranged on the two moving contact pieces 11, the moving contact points 12 being welded in the film to the moving contact pieces 11; correspondingly, each pair of the static contact heads 20 includes two static contact pieces 21 spaced apart and formed at one end of the auxiliary static contact bridge 2, and two static contact points 22 arranged on the two static contact pieces 21, the static contact points 22 being welded in the film to the static contact pieces 21. The moving and static contact points 22 of the auxiliary contact head use in-mold welding technology (i.e., the contact points are fixed by laser welding in the mold) instead of the traditional riveting process, which can effectively prevent poor riveting. In the present embodiment, the auxiliary moving contact bridge 1 is provided with four moving contact points 11, and the two auxiliary static contact bridges 2 are correspondingly provided with four static contact points 22. This design enables each group of auxiliary contact heads to realize four-contact connection. When one contact head is abnormal or fails, the other three can still maintain signal connection. Compared with the traditional contact head structure, the connection performance and reliability are greatly enhanced. As can be seen from the above, the four-contact connection design of the auxiliary contact head of the present embodiment can ensure reliable conduction of weak current, avoid signal loss caused by poor contact, and significantly improve the overall life compared with the traditional design, thereby reducing the maintenance frequency and replacement cost. The core of the four-contact design of the auxiliary contact head is the multi-point redundancy, load sharing, and fault tolerance mechanism, which effectively solves the problem of unreliable conduction caused by oxidation, foreign matter, wear, or eccentricity of the traditional auxiliary contact head, and can be applied to industrial scenes with high requirements for control loop stability to meet the user's usage requirements.
[0034] In order to further improve the conduction performance of the auxiliary contact, in combination with Figures 3-5 As shown in the figure, the movable contact 12 and the fixed contact 22 are respectively provided with a matrix-shaped or honeycomb-shaped contact structure 3, as a preferred embodiment, the contact structure includes a plurality of contact grooves 31 arranged in matrix on the surface of the movable contact 12 or the fixed contact 22, and a longitudinal and transverse contact surface 32 distributed between the plurality of contact grooves 31. The design has the following benefits: the use of scraping effect enhances the self-cleaning ability of surface foreign matter; when the contact is closed, the contact structure 3 produces local high-pressure contact with foreign matter, which can scrape off foreign matter or oxide film and extrude it out of the contact area, reducing foreign matter residues; the contact groove design can provide temporary storage space for foreign matter, avoiding direct accumulation of foreign matter on the surface of the key contact, reducing the risk of short circuit or poor contact; the contact structure 3 design can effectively remove dirt and oxide layer on the contact surface, reduce the film resistance of the contact, and greatly improve the conduction performance of the contact.
[0035] As a deformable form of the above-mentioned contact structure 3, the contact structure includes a plurality of contact protrusions arranged in matrix on the surface of the movable contact 12 or the fixed contact 22, and longitudinal and transverse grooves distributed between the plurality of contact protrusions. The surface roughness of this contact structure 3 optimizes the distribution of contact points, forming more actual conductive channels and reducing overall contact resistance; secondly, it can improve the current sharing effect, allowing current to pass through multiple dispersed micro-contact points, avoiding excessive local current density, suppressing hot spot generation, reducing temperature rise and arc erosion; in addition, the matrix-arranged contact structure 3 disperses mechanical pressure and arc energy to multiple protrusions, slowing down the wear rate of individual contact points.
[0036] As can be seen from the above, when the auxiliary contact of the embodiment uses the contact structure and four-contact connection design in combination, a double protection mechanism can be formed, which significantly reduces the conduction failure probability of the auxiliary contact, further improves the anti-foreign matter ability, contact reliability and durability of the contact, and greatly improves the conduction performance of the contact.
[0037] The following will be described in combination with Figures 2-5 The specific arrangement of the auxiliary movable contact assembly and the auxiliary fixed contact assembly will be described in detail:
[0038] The contact support 7 is provided with a contact hole for mounting the auxiliary movable contact assembly, the auxiliary movable contact bridge 1 is mounted in the contact hole and drives two pairs of movable contact heads 10 to extend on both sides of the contact hole, a limiting structure is arranged between the auxiliary movable contact bridge 1 and the contact hole, the limiting structure comprises two groups of limiting bent angles 4 which are bent on the two side edges of the auxiliary movable contact bridge 1, and two groups of limiting stop walls 8 which are arranged on the side walls of the contact hole and matched with the two groups of limiting bent angles 4, specifically, the limiting bent angle 4 is a circular angle structure, the bending angle is an obtuse angle, and preferably 120°. The advantages of this design are that the limiting bent angle 4 can reduce the risk of distortion of the auxiliary movable contact head when it is frequently started and stopped or subjected to external force, plays a limiting mounting role on the contact support 7, and the limiting bent angle 4 with a circular arc design can reduce the wear between the limiting bent angle 4 and the contact support 7, the pressure distribution is more uniform when the circular arc bending surface of the limiting bent angle 4 contacts the contact support 7, local wear (such as the wear of the corner of a right-angle bending) is avoided, the friction is more uniform when the contact reciprocates, and the mechanical properties, motion stability and service life of the auxiliary movable contact head are improved.
[0039] As shown in Figure 2 and Figure 6 The auxiliary movable contact bridge 1 is mounted on the contact support 7, and the action form is a direct-acting motion structure, the action characteristics are reliable, the product design is compact, and the installation is simple and fast. The auxiliary movable contact assembly comprises an auxiliary contact spring 5 arranged in the contact hole and in contact with the auxiliary movable contact bridge 1, the middle part of the auxiliary movable contact bridge 1 forms a positioning area 13 between the two groups of limiting bent angles 4, the contact hole is provided with a positioning block opposite to the positioning area 13, and the two ends of the auxiliary contact spring 5 are positioned and arranged in the positioning area 13 and the positioning block respectively. One end of the auxiliary contact spring 5 is positioned and mounted in the positioning area 13, the auxiliary contact spring 5 in the positioning area 13 is positioned and mounted by the two groups of limiting bent angles 4, the circular arc bending surface of the limiting bent angle 4 can reduce wear and prolong the service life when it contacts the auxiliary contact spring 5, so as to ensure the stability and reliability of the installation and contact of the auxiliary contact spring 5.
[0040] Obviously, the above embodiments are only examples for clearly illustrating, but not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. All the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the utility model.
Claims
1. A contactor auxiliary contact structure comprising at least one set of auxiliary moving contact assembly movably disposed in a contactor housing (6) by a contact support (7), and at least one set of auxiliary stationary contact assembly fixedly disposed in the contactor housing (6), characterized in that: Each auxiliary moving contact assembly includes an auxiliary moving contact bridge (1) arranged on the contact support (7), and two pairs of moving contact sections (10) respectively arranged on both ends of the auxiliary moving contact bridge (1).
2. The contactor auxiliary contact structure of claim 1, wherein: Each pair of the moving contact sections (10) includes two moving contact pieces (11) arranged on one end of the auxiliary moving contact bridge (1), and two moving contact points (12) arranged on the two moving contact pieces (11).
3. The contactor auxiliary contact structure of claim 2, wherein: Each pair of the static contact sections (20) includes two static contact pieces (21) arranged on one end of the auxiliary static contact bridge (2), and two static contact points (22) arranged on the two static contact pieces (21).
4. The auxiliary contact structure of the contactor according to claim 3, wherein: Each pair of the moving contact sections (10) and each pair of the static contact sections (20) form a parallel double-circuit channel, the moving contact points (12) are welded to the moving contact pieces (11) by film welding, and the static contact points (22) are welded to the static contact pieces (21) by film welding.
5. The contactor auxiliary contact structure of any one of claims 2-4, wherein: The contact points (12) and the static contact points (22) are respectively provided with a matrix-shaped or honeycomb-shaped undercut structure (3).
6. The contactor auxiliary contact structure of claim 5, wherein: The undercut structure includes a plurality of undercut grooves (31) arranged on the surface of the moving contact points (12) or the static contact points (22) in a matrix, and horizontal and vertical contact surfaces (32) distributed between the plurality of undercut grooves (31).
7. The contactor auxiliary contact structure of claim 5, wherein: The undercut structure includes a plurality of undercut protrusions arranged on the surface of the moving contact points (12) or the static contact points (22) in a matrix, and horizontal and vertical grooves distributed between the plurality of undercut protrusions.
8. The contactor auxiliary contact structure of claim 1, wherein: The contact support (7) is provided with a contact hole for mounting the auxiliary moving contact assembly, the auxiliary moving contact bridge (1) is mounted in the contact hole, and the two pairs of moving contact sections (10) are respectively arranged on both sides of the contact hole, the auxiliary moving contact bridge (1) and the contact hole are provided with a limiting structure, the limiting structure includes two sets of limiting bent angles (4) bent on both sides of the auxiliary moving contact bridge (1), and two sets of limiting walls (8) corresponding to the two sets of limiting bent angles (4) and arranged on the side walls of the contact hole.
9. The contactor auxiliary contact structure of claim 8, wherein: The limiting bent angle (4) is a circular arc angle structure, and the bending angle is an obtuse angle.
10. The contactor auxiliary contact structure of claim 9, wherein: The auxiliary moving contact assembly includes an auxiliary contact spring (5) arranged in the contact hole and in contact with the auxiliary moving contact bridge (1), the middle part of the auxiliary moving contact bridge (1) forms a positioning area (13) between the two sets of limiting bent angles (4), the contact hole is provided with a positioning block opposite to the positioning area (13) up and down, and the two ends of the auxiliary contact spring (5) are respectively positioned in the positioning area (13) and the positioning block.