A magnetic latching DC contactor

Abstract

The utility model discloses a kind of magnetic latching DC contactors, including cover, terminal post and magnetic circuit assembly, magnetic circuit assembly includes hollow lower support, coil holder mounted in lower support, the iron core of being set in coil holder and being movable up and down, push rod connected with iron core, upper support fixed in the upper end of lower support, magnetic pole block fixedly connected with upper support and permanent magnet fixed in coil holder upper end;Cover is covered in the upper portion of upper support, terminal post is fixed on cover;The upper end in coil holder interior is equipped with limit area, the bottom of limit area has upward support step, permanent magnet is mounted in limit area and its bottom end is supported on support step, magnetic pole block blocks limit on the upper end of permanent magnet;The structure of this magnetic latching DC contactor is optimized design, using the cooperation of support step and magnetic pole block realizes the quick and reliable positioning of permanent magnet in coil holder, and provides strong guarantee for long-term stable operation of magnetic latching contactor.

Description

Technical Field

[0001] This utility model belongs to the field of DC contactor technology, and specifically relates to a magnetic latching DC contactor. Background Technology

[0002] A magnetically latched DC contactor is an electrical control device that uses the combined action of a permanent magnet and an electromagnetic coil to achieve contactor engagement and disengagement. Its core feature is that after electromagnetic force engages the contactor, the permanent magnet maintains the engaged state, and disengagement is achieved only when necessary via reverse current, thus realizing low-power, high-reliability switching control. It is widely used in new energy, power systems, and industrial automation, and is particularly suitable for applications requiring frequent operation and long-term stable operation, offering advantages such as energy saving, long lifespan, and vibration resistance.

[0003] In existing magnetic latching DC contactors, permanent magnets are typically attached to the upper bracket via riveting or bonding. However, these methods have certain limitations. Riveting is complex and cumbersome to operate; while bonding is simple, it carries the risk of adhesive failure or accidental detachment of the permanent magnet, leading to unreliable connections and affecting the stability of the magnetic latching function, or even causing magnetic latching failure. Utility Model Content

[0004] In response, this utility model provides a magnetic latching DC contactor that facilitates quick and reliable installation of permanent magnets.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a magnetically latched DC contactor, including a housing, terminals, and a magnetic circuit assembly. The magnetic circuit assembly includes a hollow lower support, a coil frame installed within the lower support, an iron core movable within the coil frame, a push rod connected to the iron core, an upper support fixed to the upper end of the lower support, a magnetic pole block fixedly connected to the upper support, and a permanent magnet fixed to the upper end of the coil frame. The housing covers the upper part of the upper support, and the terminals are fixed to the housing. A limiting area is provided at the upper end of the coil frame, and the bottom of the limiting area has an upward-facing support step. The permanent magnet is installed within the limiting area, and its bottom end is supported on the support step. The magnetic pole block abuts against and limits the upper end of the permanent magnet.

[0007] Preferably, the housing has a through hole, the terminal block passes through the through hole, one end of the terminal block extends into the housing and is provided with a stationary contact, the other end of the terminal block extends out of the housing as an external terminal block, a fixing groove is formed around the terminal block on the inner side of the housing, a resin sealing layer is provided in the fixing groove, and the resin sealing layer is fixedly connected to the terminal block and the housing.

[0008] Preferably, the perforation is provided with an inward-facing stop step, the terminal is provided with a stop platform, the terminal extends from the inside to the perforation, and the stop platform and the stop step abut against each other to form a stop and limit on the terminal.

[0009] Preferably, the lower bracket is provided with an outer shell, which is fixedly connected to the lower bracket by screws; the outer shell is provided with an outwardly protruding mounting plate, which is provided with mounting holes.

[0010] Preferably, the outer casing is provided with a countersunk hole, and the head of the screw is recessed into the countersunk hole.

[0011] Preferably, the magnetic pole block extends into the coil frame and has an upwardly protruding annular convex edge. The upper bracket has a fixing hole, and the annular convex edge passes through the fixing hole and is riveted outward to fasten to the edge of the fixing hole.

[0012] The positive effects of this utility model are as follows: The optimized design of the magnetic latching DC contactor structure exhibits significant benefits: By embedding the permanent magnet into the limiting area inside the coil frame, and using the support steps at the bottom and the magnetic pole blocks at the top to support and limit it respectively, the permanent magnet is quickly and stably fixed; This design not only avoids the assembly complexity and risk of detachment associated with traditional riveting or bonding methods, but also significantly improves the practicality and reliability of the product, providing a strong guarantee for the long-term stable operation of the magnetic latching contactor. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art are briefly introduced below. Similar elements or parts in the drawings are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.

[0014] Figure 1 This is a cross-sectional view of the magnetic latching DC contactor in this utility model;

[0015] Figure 2 for Figure 1 Enlarged diagram of section A in the middle;

[0016] Figure 3 for Figure 1 Enlarged schematic diagram of section B in the middle.

[0017] The reference numerals in the figure are as follows: 1. Cover; 11. Perforation; 12. Fixing groove; 13. Resin sealing layer; 14. Stop step; 2. Terminal block; 21. Stationary contact; 22. External terminal; 23. Stand; 3. Magnetic circuit assembly; 31. Lower bracket; 32. Coil frame; 321. Limiting zone; 322. Support step; 33. Magnetic sleeve; 34. Iron core; 35. Push rod; 36. Upper bracket; 361. Fixing hole; 37. Magnetic pole block; 371. Annular protrusion; 38. Permanent magnet; 4. Outer shell; 41. Mounting plate; 42. Countersunk hole; 5. Moving contact. Detailed Implementation

[0018] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0019] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0020] The magnetic latching DC contactor structure of this utility model embodiment is as follows: Figures 1 to 3 As shown, it includes a housing 1, terminals 2, and a magnetic circuit assembly 3. The magnetic circuit assembly 3 includes a hollow lower support 31, a coil frame 32 installed inside the lower support 31, a magnetic sleeve 33 fixed inside the coil frame 32, an iron core 34 movable inside the coil frame 32, a push rod 35 connected to the iron core 34, an upper support 36 fixed to the upper end of the lower support 31, a magnetic pole block 37 fixedly connected to the upper support 36, and a permanent magnet 38 fixed to the upper end of the coil frame 32. The housing 1 covers the upper part of the upper support 36, and the terminals 2 are fixed to the housing 1. The upper end of the coil frame 32 has a limiting area 321, and the bottom of the limiting area 321 has an upward-facing support step 322. The magnet 38 is installed in the limiting area 321 and its bottom end is supported on the supporting step 322. The magnetic pole block 37 is positioned at the upper end of the permanent magnet 38. This magnetic latching DC contactor structure has been optimized and exhibits significant benefits: by embedding the permanent magnet 38 into the limiting area 321 inside the coil frame 32, and using the supporting step 322 at the bottom and the magnetic pole block 37 at the top to support and limit it respectively, the permanent magnet 38 is quickly and stably fixed. This design not only avoids the assembly complexity and risk of detachment associated with traditional riveting or bonding methods, but also significantly improves the practicality and reliability of the product, providing a strong guarantee for the long-term stable operation of the magnetic latching contactor.

[0021] Combination Figure 1 and Figure 2The housing 1 has a through hole 11, through which the terminal 2 passes. One end of the terminal 2 extends into the housing 1 and has a stationary contact 21. Inside the housing 1, there is a moving contact 5 corresponding to the stationary contact 21. The moving contact 5 is connected to a push rod 35. When the DC contactor is working, the moving contact 5 is moved by controlling the push rod 35, thereby realizing the contact and separation of the moving contact 5 and the stationary contact. The other end of the terminal 2 extends out of the housing 1 as an external terminal 22, which is used to connect external wires. A fixing groove 12 is formed on the inner side of the housing 1 around the terminal 2. A resin sealing layer 13 is provided in the fixing groove 12. The resin sealing layer 13 is fixedly connected to the terminal 2 and the housing 1. The resin sealing layer 13 is formed by curing insulating resin (such as epoxy resin) injected into the fixing groove 12. This structure enhances the fixing firmness of the terminal 2, effectively prevents the terminal 2 from loosening, and ensures the sealing of the corresponding parts. At the same time, it simplifies the assembly process, reduces production costs, and has significant use value and economic benefits.

[0022] See Figure 3 The through hole 11 is provided with an inward-facing stop step 14, and the terminal 2 is provided with a stop platform 23. The terminal 2 passes through the through hole 11 from the inside to the outside. The stop platform 23 and the stop step 14 abut against each other to form a stop and limit on the terminal 2. This limiting structure, combined with the resin sealing layer 13, can ensure the stable installation of the terminal 2 and avoid displacement or loosening of the terminal 2 during subsequent use.

[0023] like Figure 1 As shown, the lower bracket 31 is provided with an outer shell 4. The outer shell 4 is fixedly connected to the lower bracket 31 by screws. The outer shell 4 can protect the magnetic circuit assembly 3. In order to accommodate the installation of the magnetic latching DC contactor, the outer shell 4 is provided with an outwardly protruding mounting plate 41. The mounting plate 41 is provided with mounting holes, so that the magnetic latching DC contactor can be directly fixed to the external mounting part by fixing screws through the mounting holes. This design simplifies the installation process and improves the installation efficiency.

[0024] like Figure 1 As shown, the outer casing 4 is provided with a countersunk hole 42, and the head of the screw is recessed into the countersunk hole 42. This design achieves a flat surface treatment between the screw head and the surface of the outer casing 4, which not only improves the appearance of the outer casing 4, but also avoids installation interference or potential problems that may be caused by the screw head protruding outward.

[0025] See Figure 1The magnetic pole block 37 extends into the coil frame 32 to block and limit the permanent magnet 38. The magnetic pole block 37 has an upwardly protruding annular convex edge 371. The upper bracket 36 has a corresponding fixing hole 361. After the annular convex edge 371 passes through the fixing hole 361, it is deformed by riveting outward and directly fastened to the edge of the fixing hole 361. This riveting connection method ensures a firm and stable connection between the magnetic pole block 37 and the upper bracket 36, avoiding the loosening problem that may occur with traditional screw connections.

[0026] For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, these obvious variations or modifications derived from the essential spirit of this invention still fall within the protection scope of this utility model.

Claims

1. A magnetically latched DC contactor, comprising a housing (1), terminals (2), and a magnetic circuit assembly (3), wherein the magnetic circuit assembly (3) comprises a hollow lower support (31), a coil frame (32) housed within the lower support (31), an iron core (34) movable within the coil frame (32), a push rod (35) connected to the iron core (34), an upper support (36) fixed to the upper end of the lower support (31), a magnetic pole block (37) fixedly connected to the upper support (36), and a permanent magnet (38) fixed to the upper end of the coil frame (32); the housing (1) covers the upper part of the upper support (36), and the terminals (2) are fixed to the housing (1); characterized in that, The upper end of the coil frame (32) is provided with a limiting area (321), the bottom of the limiting area (321) has an upward supporting step (322), the permanent magnet (38) is installed in the limiting area (321) and its bottom end is supported on the supporting step (322), the magnetic pole block (37) is abutted and limited at the upper end of the permanent magnet (38); a fixing groove (12) is formed on the inner side of the cover (1) around the terminal (2), a resin sealing layer (13) is provided in the fixing groove (12), the resin sealing layer (13) is fixedly connected to the terminal (2) and the cover (1), and the resin sealing layer (13) is formed by curing the insulating resin injected into the fixing groove (12).

2. The magnetically latching DC contactor according to claim 1, characterized in that, The housing (1) is provided with a through hole (11), and the terminal (2) is provided through the through hole (11). One end of the terminal (2) extends into the housing (1) and is provided with a stationary contact (21). The other end of the terminal (2) extends out of the housing (1) as an external terminal (22).

3. The magnetically latching DC contactor according to claim 2, characterized in that, The perforation (11) is provided with an inward-facing stop step (14), and the terminal (2) is provided with a stop platform (23). The terminal (2) is inserted from the inside to the outside into the perforation (11). The stop platform (23) and the stop step (14) abut against each other to form a stop limit on the terminal (2).

4. The magnetically latching DC contactor according to claim 1, characterized in that, The lower bracket (31) is provided with an outer shell (4), which is fixedly connected to the lower bracket (31) by screws; the outer shell (4) is provided with an outwardly protruding mounting plate (41), which is provided with mounting holes.

5. The magnetically latching DC contactor according to claim 4, characterized in that, The outer casing (4) is provided with a countersunk hole (42), and the head of the screw is recessed into the countersunk hole (42).

6. The magnetically latching DC contactor according to claim 1, characterized in that, The magnetic pole block (37) extends into the coil frame (32) and has an upwardly protruding annular convex edge (371). The upper bracket (36) has a fixing hole (361). The annular convex edge (371) passes through the fixing hole (361) and is riveted outward to fasten to the edge of the fixing hole (361).

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