High-voltage direct-current contactor with limiting structure
By introducing a limiting structure into the high-voltage DC contactor, the movement trajectory of the push rod assembly is restricted, thus solving the problem of closing offset caused by the rotation of the push rod assembly. This achieves higher reliability and stability, extends equipment life, and reduces maintenance costs.
Patent Information
- Application Number
- CN202520172180.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-01-24
AI Technical Summary
The push rod assembly of existing high-voltage DC contactors may rotate during operation, causing the closing trajectory of the moving and stationary contacts to deviate, affecting reliability and stability.
The system employs a limiting structure, including a limiting guide and a mating part, to restrict the five degrees of freedom of the push rod assembly, ensuring its unique motion trajectory. The system provides guiding and limiting functions through the cooperation of the guide post and the limiting hole or the slider and the groove.
It improves the reliability and stability of the actuator assembly, extends equipment life, reduces maintenance frequency and cost, and enhances electrical performance and accuracy.
Smart Images
Figure CN223871419U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrical control device technology, and in particular to a high-voltage DC contactor with a limiting structure. Background Technology
[0002] High-voltage DC contactors, as electrical devices for long-distance connection and disconnection of DC circuits, feature large control capacity, suitability for frequent operation, and remote intelligent control. They play a vital role in power systems and are widely used in solar energy systems, urban rail transit, subways, charging piles, energy storage battery packs, uninterruptible power supplies, and the communications industry. High-voltage DC contactors can withstand voltages of several thousand volts or even higher without breakdown or flashover, and can carry or disconnect currents of several hundred to several thousand amperes. The contact components are specially designed to ensure long lifespan and reliability under frequent operation and extreme working conditions. Furthermore, high-voltage DC contactors are small in size and light in weight, facilitating transportation, installation, and maintenance, reducing downtime and maintenance costs, thereby ensuring safe, efficient, and reliable power transmission.
[0003] As a crucial component of a contactor, the push rod assembly not only needs to transmit force but also ensure the reliable movement of the moving contact. In related technologies, push rod assemblies typically use a moving contact and a ceramic cover limiting rib for positioning, or a fixed frame and a ceramic cover limiting rib for positioning. However, this only restricts two degrees of freedom of the push rod assembly. During movement, the push rod assembly may still rotate, causing deviations in its trajectory and affecting the closure of the moving and stationary contacts. Utility Model Content
[0004] The main purpose of this invention is to propose a high-voltage DC contactor with a limiting structure, which aims to provide a high-voltage DC contactor that can ensure more reliable movement of the push rod assembly and a unique movement trajectory.
[0005] To achieve the above objectives, this utility model proposes a high-voltage DC contactor with a limiting structure, comprising a housing and a push rod assembly. The housing forms a receiving cavity and is provided with a stationary contact and an auxiliary contact, which are located on the same side of the housing. The push rod assembly is provided with a movable end near the stationary contact, and the movable end is provided with a moving contact and a conductive plate. The moving contact faces the stationary contact, and the conductive plate faces the auxiliary contact.
[0006] The high-voltage DC contactor with a limiting structure further includes a limiting structure, which includes a limiting guide and a mating part. One of the limiting guide and the mating part is located on the side of the housing facing the stationary contact, and the other is located on the push rod assembly. The limiting guide is slidably disposed on the mating part.
[0007] In one embodiment, the housing includes an upper housing and a yoke plate covering an opening in the upper housing, the push rod assembly is disposed on the yoke plate and has a push plate that can approach or move away from the yoke plate, and the stationary contact and the auxiliary contact are disposed on the inner sidewall of the upper housing facing the yoke plate.
[0008] In one embodiment, the limiting guide is a guide post, and the guide post is disposed on the yoke plate;
[0009] The mating part is a limiting hole, which is provided on the push plate. The inner diameter of the limiting hole is larger than the outer diameter of the guide post, and the limiting hole is movably sleeved on the guide post.
[0010] In one embodiment, the push plate is provided with a bracket, the bracket extends along the width direction of the push plate, the guide post is located at both ends of the bracket in the projection area of the yoke plate, and the limiting hole is provided in the bracket.
[0011] In one embodiment, the push plate and the bracket are coated with adhesive.
[0012] In one embodiment, the high-voltage DC contactor with the limiting structure is provided with two guide posts and two limiting holes, the yoke plate is provided with two mounting holes, the two mounting holes are respectively located on both sides of the push plate, and each guide post is provided in one mounting hole;
[0013] The two limiting holes are respectively located at both ends of the bracket.
[0014] In one embodiment, the guide post has an annular pad at one end near the mounting hole, and the guide post is welded to the yoke plate through the annular pad.
[0015] In one embodiment, the inner peripheral wall of the limiting hole is provided with a wear-resistant layer, which is used to abut against and limit the guide post.
[0016] In one embodiment, the limiting guide is a slider, the slider is disposed on the push plate, and a portion of the slider extends out of the push plate;
[0017] The mating part is a sliding groove, which is provided on the yoke plate and perpendicular to the yoke plate, and the slider is slidably disposed in the sliding groove.
[0018] In one embodiment, the high-voltage DC contactor with a limiting structure includes two sets of moving contacts and two sets of stationary contacts. The two sets of moving contacts are disposed on the push rod assembly, and the two sets of stationary contacts are disposed on the housing. Each set of moving contacts corresponds to one set of stationary contacts.
[0019] The present invention provides a high-voltage DC contactor with a limiting structure, comprising a housing and a push rod assembly. The housing has a cavity and includes a stationary contact and an auxiliary contact located on the same side of the housing. The push rod assembly has a movable end near the stationary contact, and the movable end includes a moving contact and a conductive plate. The moving contact faces the stationary contact, and the conductive plate faces the auxiliary contact. The contactor also includes a limiting structure, the purpose of which is to limit the push rod assembly, thereby ensuring its reliable and unique movement trajectory. The limiting structure includes a limiting guide and a mating part. The limiting guide can be located in the housing or in the push rod assembly. When one is located in the housing and the other in the push rod assembly, the limiting guide will guide the push rod assembly when it moves relative to the housing, restricting its rotational movement around the push rod axis, thereby ensuring the reliability of the push rod assembly's movement. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0021] Figure 1 A schematic diagram of an embodiment of a high-voltage DC contactor with a limiting structure provided by this utility model;
[0022] Figure 2 for Figure 1 A schematic diagram of the internal structure of a high-voltage DC contactor with a limiting structure.
[0023] Figure 3 for Figure 1 Schematic diagram of the push rod assembly;
[0024] Figure 4 for Figure 1 Schematic diagram of the middle yoke plate;
[0025] Figure 5 This is a schematic diagram of the guide column inside a high-voltage DC contactor with a limiting structure.
[0026] Explanation of icon numbers:
[0027] 100. High-voltage DC contactor with limiting structure; 1. Housing; 11. Upper housing; 111. Stationary contact; 112. Auxiliary contact; 12. Yoke plate; 121. Guide post; 121a. Annular pad; 121b. Snap-fit boss; 122. Mounting hole; 2. Push rod assembly; 21. Moving contact; 22. Cage; 23. Push plate; 24. Conductor piece; 25. Bracket; 251. Limiting hole; 26. Push rod; 3. Drive mechanism.
[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0032] This invention proposes a high-voltage DC contactor with a limiting structure, aiming to provide a high-voltage DC contactor that ensures more reliable movement of the push rod assembly and a unique movement trajectory. Figures 1 to 5 This is a schematic diagram of an embodiment of the high-voltage DC contactor with a limiting structure provided by this utility model.
[0033] Please refer to Figures 1 to 5 This utility model proposes a high voltage DC contactor 100 with a limiting structure, including a housing and a push rod assembly 2. The housing forms a cavity and is provided with a stationary contact 111 and an auxiliary contact 112. The stationary contact 111 and the auxiliary contact 112 are located on the same side of the housing. The push rod assembly 2 is provided with a movable end near the stationary contact 111. The movable end is provided with a moving contact 21 and a conductive plate 24. The moving contact 21 is disposed facing the stationary contact 111, and the conductive plate 24 is disposed facing the auxiliary contact 112.
[0034] The high-voltage DC contactor 100 with a limiting structure also includes a limiting structure, which includes a limiting guide and a mating part. One of the limiting guide and the mating part is located on the side of the housing facing the stationary contact 111, and the other is located on the push rod assembly 2. The limiting guide is slidably located on the mating part.
[0035] The present invention provides a high-voltage DC contactor 100 with a limiting structure, comprising a housing and a push rod assembly 2. The housing has a cavity and is provided with a stationary contact 111 and an auxiliary contact 112, which are located on the same side of the housing. The push rod assembly 2 has a movable end near the stationary contact 111, which is provided with a moving contact 21 and a conductive plate 24. The moving contact 21 faces the stationary contact 111, and the conductive plate 24 faces the auxiliary contact 112. The contactor also includes... The limiting structure aims to limit the movement of the push rod assembly 2, thereby ensuring its reliable and unique motion trajectory. The limiting structure includes a limiting guide and a mating part. The limiting guide can be located in the housing or in the push rod assembly 2. When one is located in the housing and the other is located in the push rod assembly 2, the limiting guide will guide the push rod assembly 2 when it moves relative to the housing, restricting its rotational movement around the push rod 26 axis, thereby ensuring the reliability of the movement of the push rod assembly 2.
[0036] The push rod assembly 2 within the high-voltage DC contactor 100 with a limiting structure is driven by a drive mechanism 3. The drive mechanism 3 can be a magnetic device, a cylinder, or other pneumatic or hydraulic drive methods; this invention does not limit its use. In one embodiment, the drive mechanism 3 is a magnetic device, including a moving iron core. A coil (not shown in the figure) is provided around the moving iron core. When the coil is energized, it generates a magnetic field that drives the moving iron core to move up and down, thereby moving the push rod 26 and driving the moving contact 21 to move towards and close with the stationary contact 111, thus connecting the circuit. When the coil is de-energized, the magnetic field disappears, and the moving contact 21 returns to its initial position under the action of the spring force, disconnecting from the stationary contact 111 and cutting off the circuit. This drive method has a fast response speed, simple control, and the closing force of the contactor can be controlled by adjusting the coil current, ensuring a reliable electrical connection in the high-voltage DC system.
[0037] The high-voltage DC contactor 100 with a limiting structure proposed in this design can restrict five degrees of freedom of the push rod assembly 2 through the mutual cooperation of the limiting guide part and the mating part in the limiting structure. These five degrees of freedom are the movement and rotation along the length direction of the yoke plate 12, the movement and rotation along the width direction of the yoke plate 12, and the rotation around the axis of the push rod 26. By restricting these five degrees of freedom, it can be ensured that the push rod assembly 2 has a unique motion trajectory when it moves, thereby improving the stability and reliability of the equipment during its electrical life.
[0038] In the first embodiment of this utility model, the limiting guide part in the limiting structure is a guide post 121, and correspondingly, the mating part is a limiting hole 251. For details, please refer to further reading. Figure 2 It should be noted that the guide post 121 can be set on the yoke plate 12, and a limiting hole 251 can be opened on the push plate 23. Alternatively, the guide post 121 can be set on the push plate 23, and a raised boss can be set on the side of the yoke plate 12 facing the push plate 23, with a limiting hole 251 set in the boss. This can ensure good guidance while also having better structural strength. This utility model does not limit the setting position of the guide post 121 and the limiting hole 251. In this embodiment, the guide post 121... A bracket 25 is provided on the yoke plate 12, with limiting holes 251 opened on the push plate 23. The two ends of the bracket 25 extend laterally along the push plate 23 and are exposed on the yoke plate 12 beyond the area covered by the push plate 23. The guide post 121 is located in the projection area of the bracket 25 on the yoke plate 12. When the push rod assembly 2 is installed as a whole on the yoke plate 12, the two limiting holes 251 on the bracket 25 are respectively aligned with the two guide posts 121 on the yoke plate 12, so that the limiting structure completes the engagement.
[0039] Based on the above embodiments, it should be noted that the guide post 121 can be installed on the yoke plate 12 by snap-fit or by welding. This utility model does not limit this. In one embodiment of this utility model, the yoke plate 12 is provided with mounting holes 122. For details, please refer to further description. Figure 4 The mounting end of the guide post 121 is configured as a snap-fit boss 121b. The outer diameter of the snap-fit boss 121b is greater than or equal to the inner diameter of the mounting hole 122, so that the guide post 121 can be snapped and fixed by the snap-fit boss 121b and the mounting hole 122 through interference fit.
[0040] Furthermore, an annular pad 121a is provided around the periphery of the guide post 121. For details, please refer to further documentation. Figure 5 After the snap-fit boss 121b is assembled into the mounting hole 122, the annular solder pad 121a abuts against the opening of the mounting hole 122 to achieve the in-place installation. The annular solder pad 121a is welded around its periphery using a welding machine, so that the guide post 121 and the yoke plate 12 are installed by solder, which enhances the stability of the entire structure and prevents the components from shifting due to vibration or impact.
[0041] When the contactor reaches the end of its electrical life, the bracket 25 moves with the push plate 23 to engage or disengage the moving contact 21 and the stationary contact 111. During this process, the guide post 121 continuously rubs against the inner wall of the limiting hole 251. Therefore, this device provides a wear-resistant layer, such as a ceramic coating or a polymer plastic coating, on the inner peripheral wall of the limiting hole 251. This ensures that the outer peripheral wall of the guide post 121 is in contact with the wear-resistant layer. The presence of the wear-resistant layer significantly reduces the wear between the guide post 121 and the limiting hole 251, thereby extending the overall service life of the contactor. Secondly, it helps maintain the movement accuracy of the guide post 121, ensuring that the moving contact 21 and the stationary contact 111 can accurately engage or disengage, thus improving the electrical performance of the contactor. In addition, due to the reduction in wear, the maintenance frequency and potential repair costs of the contactor are correspondingly reduced, lowering the risk of failure caused by wear.
[0042] In the second embodiment of this utility model, the limiting guide part is a slider, the mating part is a groove, and the limiting guide part and the mating part are reversed. That is, protrusions are set at both ends of the bracket 25 to act as sliders, and strip blocks extending along the direction perpendicular to the yoke plate 12 are set on the yoke plate 12. A groove is opened on the side of the strip block facing the slider. In this way, the outer surface of the slider abuts against the side wall and bottom of the groove and limits the movement. This not only guides the push rod assembly 2, but also prevents the push rod assembly 2 from rotating axially around the push rod 26.
[0043] In the third embodiment of this utility model, a further derivative of the second embodiment is used. Utilizing the sliding fit between the slider and the groove, a permanent magnet is placed at the bottom of the groove, and a magnet of the same polarity is placed on the side of the slider facing the permanent magnet. This prevents the slider from contacting the three side walls of the groove. By utilizing the repulsive property of like poles, the slider and the groove are limited by magnetic force, creating a non-contact limiting mechanism. This significantly reduces friction and wear during the sliding process, thereby reducing energy loss and material consumption. Secondly, magnetic limiting provides more stable positioning, improving the slider's motion accuracy and repeatability. Furthermore, magnetic levitation limiting reduces physical contact, extending the service life of the equipment and components.
[0044] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A high-voltage DC contactor with a limiting structure, characterized in that, The device includes a housing and a push rod assembly. The housing has a receiving cavity and is provided with a stationary contact and an auxiliary contact. The stationary contact and the auxiliary contact are located on the same side of the housing. The push rod assembly is provided with a movable end near the stationary contact. The movable end is provided with a moving contact and a conductive plate. The moving contact faces the stationary contact, and the conductive plate faces the auxiliary contact. The high-voltage DC contactor with a limiting structure further includes a limiting structure, which includes a limiting guide and a mating part. One of the limiting guide and the mating part is located on the side of the housing facing the stationary contact, and the other is located on the push rod assembly. The limiting guide is slidably disposed on the mating part.
2. The high-voltage DC contactor with a limiting structure as described in claim 1, characterized in that, The housing includes an upper housing and a yoke plate covering an opening in the upper housing. The push rod assembly is disposed on the yoke plate and has a push plate that can move closer to or further away from the yoke plate. The stationary contact and the auxiliary contact are disposed on the inner sidewall of the upper housing facing the yoke plate.
3. The high-voltage DC contactor with a limiting structure as described in claim 2, characterized in that, The limiting guide part is a guide post, and the guide post is disposed on the yoke plate; The mating part is a limiting hole, which is provided on the push plate. The inner diameter of the limiting hole is larger than the outer diameter of the guide post, and the limiting hole is movably sleeved on the guide post.
4. The high-voltage DC contactor with a limiting structure as described in claim 3, characterized in that, The push plate is provided with a bracket, which extends along the width direction of the push plate. The guide post is located at both ends of the bracket in the projection area of the yoke plate, and the limiting hole is provided in the bracket.
5. The high-voltage DC contactor with a limiting structure as described in claim 4, characterized in that, The push plate and the bracket are coated with rubber.
6. The high-voltage DC contactor with a limiting structure as described in claim 3, characterized in that, The high-voltage DC contactor with a limiting structure is provided with two guide posts and two limiting holes. The yoke plate is provided with two mounting holes, which are located on both sides of the push plate. Each guide post is provided in one mounting hole. The two limiting holes are respectively located at both ends of the bracket.
7. The high-voltage DC contactor with a limiting structure as described in claim 6, characterized in that, The guide post has an annular welding pad at one end near the mounting hole, and the guide post is welded to the yoke plate through the annular welding pad.
8. The high-voltage DC contactor with a limiting structure as described in claim 3, characterized in that, The inner peripheral wall of the limiting hole is provided with a wear-resistant layer, which is used to abut against and limit the guide post.
9. The high-voltage DC contactor with a limiting structure as described in claim 2, characterized in that, The limiting guide is a slider, which is disposed on the push plate, and a portion of the slider extends out of the push plate. The mating part is a sliding groove, which is provided on the yoke plate and perpendicular to the yoke plate, and the slider is slidably disposed in the sliding groove.
10. The high-voltage DC contactor with a limiting structure as described in any one of claims 1 to 9, characterized in that, The high-voltage DC contactor with a limiting structure includes two sets of moving contacts and two sets of stationary contacts. The two sets of moving contacts are located on the push rod assembly, and the two sets of stationary contacts are located on the housing. Each set of moving contacts corresponds to one set of stationary contacts.