Direct-acting high-voltage direct-current contactor
By setting a bracket and a limiting post inside the contact cavity, the problem of space limitation of the limiting rib in the prior art is solved, and the effective deflection and limiting of the moving contact is realized, avoiding scraping and ensuring good contact of the contact point.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN HONGFA ELECTRIC POWER CONTROLS CO LTD
- Filing Date
- 2025-01-07
- Publication Date
- 2026-05-01
AI Technical Summary
When arranging auxiliary contact structures inside the insulating cover of existing direct-acting high-voltage DC contactors, space constraints prevent the addition of limiting ribs. The plastic ribs are prone to scratching foreign objects, causing the contacts to fail to conduct.
A bracket is installed inside the contact cavity, and a limiting post is installed on the support foot assembly of the bracket. The limiting post is made of wear-resistant material. The deflection of the moving contact is limited by the limiting posts on both sides to avoid scraping.
There is no need to set limiting ribs on the inner wall of the insulating cover, add brackets and limiting posts to achieve circumferential deflection restriction of the moving contact, ensure effective contact of the contact and prevent the generation of shavings.
Smart Images
Figure CN224190895U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of contactors, specifically to a direct-acting high-voltage DC contactor. Background Technology
[0002] Direct-acting high-voltage DC contactors are a type of relay. Existing direct-acting high-voltage DC contactors have a cylindrical moving iron core that drives a moving spring to rotate circumferentially during operation. To ensure good contact and prevent misalignment between the moving and stationary contacts, the width of the moving contact needs to be limited. In existing technologies, this limitation is mostly achieved by extending two relatively long ribs within an insulating cover (usually a ceramic cover). However, when auxiliary contacts or other structures need to be arranged within the insulating cover cavity (i.e., the contact cavity), space constraints prevent the addition of limiting ribs. Furthermore, auxiliary contact modules are mostly made of plastic components; directly using plastic ribs for limitation can easily scratch away foreign objects, causing contact failure. Utility Model Content
[0003] To address the aforementioned problems, this invention provides a direct-acting high-voltage DC contactor.
[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0005] A direct-acting high-voltage DC contactor includes a magnetic circuit section, a contact section, a push rod section, and an insulating cover. The insulating cover is assembled on the magnetic circuit section to form a contact cavity. The magnetic circuit section is driven and connected to the push rod section. The moving contact of the contact section is disposed in the contact cavity and assembled on the push rod section. A bracket is also assembled in the contact cavity. The bracket has at least one set of support legs. The support legs include two support columns located on both sides of the moving contact in the width direction. A limit post is provided on the side of the two support columns facing the moving contact. The moving contact is deflected and limited by the limit posts on both sides.
[0006] Furthermore, the limiting post is made of a high-temperature resistant and wear-resistant material.
[0007] Furthermore, the limiting post is made of metal or ceramic.
[0008] Furthermore, the aforementioned limiting post is embedded in the support foot and exposed on the side of the support foot facing the moving contact.
[0009] Furthermore, the bracket is integrally molded by injection molding and covers the limiting post.
[0010] Furthermore, the limiting post is riveted or glued to the support foot.
[0011] Furthermore, the limiting post is a cylinder.
[0012] Furthermore, the bracket is an auxiliary contact bracket, which is provided with a push rod, an auxiliary moving contact, a normally closed auxiliary stationary contact, and a normally open auxiliary stationary contact. The auxiliary moving contact is located between the normally closed and normally open auxiliary stationary contacts, and the push rod corresponds to the auxiliary moving contact. When the moving contact is in the open state, the auxiliary moving contact is in contact with the normally closed auxiliary stationary contact. When the magnetic circuit part drives the moving contact to close through the push rod part, the push rod part also acts on the push rod, and drives the auxiliary moving contact to switch to contact with the normally open auxiliary stationary contact by pushing the push rod.
[0013] Furthermore, the magnetic circuit portion has a yoke plate, the insulating cover is mounted on the yoke plate of the magnetic circuit portion, and the push rod portion passes through the yoke plate and is connected to the moving contact.
[0014] Furthermore, the bracket is fixed to the yoke plate by a support leg assembly.
[0015] Furthermore, the bracket has two sets of support legs, and limiting posts are provided on at least two support columns of one set of support legs.
[0016] Furthermore, the support column is parallel to the direction of movement of the moving iron core.
[0017] Furthermore, the push rod portion includes a push rod and a fixed base; the push rod is connected to the moving iron core of the magnetic circuit portion, and one end of it extends into the contact cavity; the fixed base is integrally formed by injection molding at the end of the push rod located in the contact cavity; the moving contact is assembled on the fixed base, and an elastic element is also provided between the fixed base and the moving contact, the elastic element applying a spring force to the moving contact in the direction of the stationary contact.
[0018] Furthermore, the insulating cover is a ceramic cover.
[0019] The technical solution provided by this utility model has the following beneficial effects:
[0020] The solution disclosed in this application eliminates the need for limiting ribs on the inner wall of the insulating cover, allowing for the addition of a support for auxiliary contacts and other structures within the contact cavity. Furthermore, the support for auxiliary contacts and other structures is added within the contact cavity, and limiting posts are installed on the two support legs of the support. The moving contact achieves deflection limitation through the limiting posts on both sides. This effectively restricts the circumferential deflection of the moving contact, and the contact between the limiting posts and the moving contact is less prone to generating scraping. Attached Figure Description
[0021] Figure 1 The figure shown is a partial structural cross-sectional view of the direct-acting high-voltage DC contactor along its length in the embodiment.
[0022] Figure 2 The figure shown is a partial cross-sectional view of the direct-acting high-voltage DC contactor along its width in the embodiment.
[0023] Figure 3 The figure shown is a schematic diagram of the transverse cross-section of the direct-acting high-voltage DC contactor in the embodiment;
[0024] Figure 4 The figure shown is a three-dimensional schematic diagram of the bracket in the embodiment;
[0025] Figure 5 The image shown is a side view of the bracket in the embodiment. Detailed Implementation
[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0027] In the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this invention.
[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.
[0029] Reference Figures 1 to 5 As shown, this embodiment provides a direct-acting high-voltage DC contactor, including a magnetic circuit section, a contact section, a push rod section 50, and an insulating cover (a ceramic cover 30 in this embodiment). Specifically, in this embodiment, the magnetic circuit section adopts existing technology and includes a coil, a moving iron core 11, and a yoke plate 13, etc. The magnetic field generated by the energized coil drives the moving iron core to move (see attached diagram). Figure 1 and Figure 2(As shown in the diagram, the movement is vertical). The yoke plate 13 is used for magnetic conduction. The ceramic cover 30 is assembled on the magnetic circuit part 10 to form a contact cavity 301. Specifically, the ceramic cover 30 is assembled on the yoke plate 13 of the magnetic circuit part 10 to form a contact cavity 301. The magnetic circuit part is driven and connected to the push rod part 50. Specifically, the push rod part 50 is connected to the moving iron core 11, and the upper end of the push rod part 50 passes through the yoke plate 13 and enters the contact cavity 301. The contact portion includes two stationary contacts 22 fixed on a ceramic cover 30 and a moving contact 21 disposed in a contact cavity 301 corresponding to the two stationary contacts 22. The two stationary contacts 22 are fixed on the ceramic cover 30, with their lower ends extending into the contact cavity 301 and their upper ends extending out of the ceramic cover 30 for external wiring. The moving contact 21 is mounted on a push rod portion 50. The moving iron core 11 drives the push rod portion 50 to rise, causing the moving contact 21 to contact the two stationary contacts 22 to achieve closing. The moving iron core 11 drives the push rod portion 50 to fall, causing the moving contact 21 to separate from the two stationary contacts 22 to achieve opening.
[0030] The contact cavity 301 is further equipped with a bracket 40, which is made of plastic. The bracket 40 has at least one set of support legs; in this embodiment, the bracket 40 has two sets of support legs. Each set of support legs includes two support columns 41 located on both sides of the moving contact 21 in the width direction. The bracket 40 is supported on the yoke plate 13 by the four support columns 41 of the two sets of support legs. Further, in this embodiment, a limiting post 42 is provided on the side of the two support columns 41 of one set of support legs facing the moving contact 21. Specifically, the limiting post 42 is preferably made of a wear-resistant material, such as metal or ceramic. The moving contact 21 is deflected and limited by the limiting posts 42 on both sides in the width direction. Figure 3 As shown, the two support columns 41 of the left-side support leg group are equipped with limit posts 42, while the two support columns 41 of the right-side support leg group are not equipped with limit posts 42. The gap between the two limit posts 42 on the left is smaller than the gap between the two support columns 41 on the right. Thus, when the moving contact 21 deflects circumferentially, it will first contact the limit post 42, thereby limiting the deflection of the moving contact 21 in the circumferential direction (the circumferential direction refers to the direction around the moving iron core 21). The circumferential deflection of the moving contact 21 is limited by the limit posts 42, and the contact between the limit posts 42 and the moving contact 21 is less likely to produce scraping, ensuring effective contact of the contact point.
[0031] Of course, in other embodiments, the two sets of support legs of the bracket 40 may also be provided with limiting posts 42; or the bracket 40 may also have one set of support legs or two or more sets of support legs, as long as at least one set of support legs is provided with the limiting posts 42 to limit the circumferential deflection of the moving contact 21.
[0032] Furthermore, in this embodiment, the limiting post 42 is embedded in the support foot 41 and is also exposed on the inner side of the support foot 41 (i.e., the side facing the moving contact 21); the embedded design makes the limiting post 42 more stable and reliable, and also improves space utilization. In this specific embodiment, the bracket 40 is integrally molded by injection molding and covers the limiting post 42. Before injection molding the bracket 40, the limiting post 42 is pre-embedded in the injection mold, and then the bracket 40 is integrally molded by injection molding, thus also covering the limiting post 42; this is convenient and efficient. At the same time, the material of the limiting post 42 needs to be selected to be high-temperature resistant (i.e., higher than the temperature during injection molding of the bracket 40) to prevent deformation during injection molding; existing common metal materials (such as iron, copper, and metal alloys) and ceramic materials can all meet this requirement. Of course, in other embodiments, the limiting post 42 can also be fixed to the support foot 41 by riveting or bonding; however, the assembly method is more complicated and less efficient than injection molding.
[0033] Furthermore, in this embodiment, the limiting post 42 is a cylinder; its outer circumferential surface is an arc surface, which restricts the moving contact 21 from deflecting and forms point contact with the moving contact 21, thereby minimizing friction on the moving contact 21 and other possible obstacles.
[0034] Furthermore, the push rod portion 50 includes a push rod 51 and a fixed base 52; the push rod 51 is connected to the moving iron core 11 of the magnetic circuit portion, and its upper end extends into the contact cavity 301; the fixed base 52 is integrally formed on the upper end of the push rod 51 by injection molding; the moving contact 21 is assembled on the fixed base 52, and an elastic element 23 is also provided between the fixed base 52 and the moving contact 21. The elastic element 23 applies an upward elastic force to the moving contact 21, so that when the moving contact 21 moves upward to contact the stationary contact 22, it has an elastic buffer to avoid rigid contact.
[0035] The support column 41 is parallel to the direction of movement of the movable push rod portion 50, ensuring that an equidistant gap can be formed between the support column 41 and the movable contact 21 at any position during its rise and fall. Of course, in other embodiments, the support column 41 can also be inclined, etc., as long as it does not hinder the movement of the movable contact 21 and can timely limit the circumferential deflection of the movable contact 21.
[0036] Specifically, in this embodiment, the bracket 40 is an auxiliary contact bracket, that is, the bracket 40 is used to install auxiliary contacts. Specifically, the auxiliary contact bracket is provided with a push rod (not shown), an auxiliary moving contact (not shown), a normally closed auxiliary stationary contact (not shown), and a normally open auxiliary stationary contact (not shown). The auxiliary moving contact is located between the normally closed auxiliary stationary contact and the normally open auxiliary stationary contact, and the push rod corresponds to the auxiliary moving contact. When the moving contact 21 is in the open state, the auxiliary moving contact is in contact with the normally closed auxiliary stationary contact. When the magnetic circuit part drives the moving contact 21 to close through the push rod part 50, the push rod part 50 also acts on the push rod, and drives the auxiliary moving contact to switch to contact with the normally open auxiliary stationary contact by pushing the push rod. Of course, in other embodiments, the bracket 40 can also install other functional components, such as a short-circuit ring bracket for installing a short-circuit ring, etc.
[0037] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.
Claims
1. A direct-acting high-voltage DC contactor, comprising a magnetic circuit portion, a contact portion, a push rod portion, and an insulating cover, wherein the insulating cover is mounted on the magnetic circuit portion to form a contact cavity, the magnetic circuit portion is driven and connected to the push rod portion, and the moving contact of the contact portion is disposed within the contact cavity and mounted on the push rod portion; characterized in that: The contact cavity is also equipped with a bracket, which has at least one set of support feet. The support feet include two support columns located on both sides of the moving contact in the width direction. A limit post is provided on the side of the two support columns facing the moving contact. The moving contact is deflected and limited by the limit posts on both sides.
2. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The limiting post is made of metal or ceramic.
3. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The limiting post is embedded in the support foot and exposed on the side of the support foot facing the moving contact.
4. The direct-acting high-voltage DC contactor according to claim 3, characterized in that: The bracket is integrally molded by injection molding and covers the limiting post.
5. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The limiting post is riveted or glued to the support foot.
6. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The limiting post is a cylinder.
7. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The bracket is an auxiliary contact bracket, which is equipped with a push rod, an auxiliary moving contact, a normally closed auxiliary stationary contact, and a normally open auxiliary stationary contact. The auxiliary moving contact is located between the normally closed and normally open auxiliary stationary contacts, and the push rod corresponds to the auxiliary moving contact. When the moving contact is in the open state, the auxiliary moving contact is in contact with the normally closed auxiliary stationary contact. When the magnetic circuit drives the moving contact to close through the push rod, the push rod also acts on the push rod and drives the auxiliary moving contact to switch to contact with the normally open auxiliary stationary contact by pushing the push rod.
8. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The magnetic circuit section has a yoke plate, the insulating cover is mounted on the yoke plate of the magnetic circuit section, and the push rod section passes through the yoke plate and is connected to the moving contact.
9. The direct-acting high-voltage DC contactor according to claim 8, characterized in that: The bracket is fixed to the yoke plate by a support leg assembly.
10. The direct-acting high-voltage DC contactor according to claim 1 or 9, characterized in that: The bracket has two sets of support legs, and limiting posts are provided on at least two support columns of one set of support legs.
11. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The support column is parallel to the direction of movement of the moving iron core of the magnetic circuit section.
12. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The push rod portion includes a push rod and a fixed base; the push rod is connected to the moving iron core of the magnetic circuit portion, and one end of the push rod extends into the contact cavity; the fixed base is integrally formed by injection molding at the end of the push rod located in the contact cavity; the moving contact is assembled on the fixed base, and an elastic element is also provided between the fixed base and the moving contact, the elastic element applying a spring force to the moving contact in the direction of the stationary contact.
13. The direct-acting high-voltage DC contactor according to claim 1, characterized in that: The insulating cover is a ceramic cover.