Relay magnetic circuit structure and relay

Abstract

The invention discloses a relay magnetic circuit structure and a relay, and the relay magnetic circuit structure comprises a coil assembly, a first yoke, a second yoke, and a rocker type armature which is rotatably arranged between the first yoke and the second yoke through a rotating shaft structure and is used in cooperation with the first yoke and the second yoke. A rotating fulcrum of the rocker type armature is eccentrically arranged so that the rocker type armature can form a long force arm end opposite to the first yoke and a short force arm end opposite to the second yoke, the long force arm end is configured to be in a normally-open state with the first yoke, and the short force arm end is configured to be in a normally-closed state with the second yoke. A first permanent magnet is arranged on the pole face side of the long force arm end, a second permanent magnet is arranged on the pole face side of the short force arm end, and the magnetic force of the second permanent magnet is larger than that of the first permanent magnet. According to the magnetic circuit structure, the double-magnetic-steel structure is adopted, the magnetic forces of the two magnetic steels are different, and the magnetic steels are also asymmetrically arranged, so that compared with a seesaw type balanced magnetic circuit structure, the magnetic circuit structure is more flexible in attraction control.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a relay magnetic circuit structure and a relay. Background Art

[0002] As a control component, electromagnetic relays are widely used in aerospace, automobiles, home appliances, industrial control and other fields. With the improvement of environmental awareness and the requirements of small size and high reliability of relays, polarized relays have been used more and more. Compared with conventional electromagnetic relays, they mainly add permanent magnets to the magnetic circuit structure. Through the cooperation of coil excitation and permanent magnets, it is easier to achieve low power consumption and miniaturization. Seesaw-type balanced magnetic circuits are widely used in polarized relays. Their magnetic circuits are usually symmetrical structures, but the reaction force generated in the contact system is often unbalanced, so a series of other measures are usually added to achieve a good match between suction and reaction force, thereby increasing the manufacturing cost of the product. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a relay magnetic circuit structure, which adopts a dual magnetic steel structure, and the magnetic forces of the two magnetic steels are different in size and the arrangement is also asymmetrical. Compared with the seesaw balanced magnetic circuit structure, it is more flexible in controlling the suction force. During the design and debugging stages, the trend of the suction curve can be controlled by changing the size and relative position of the two magnetic steels to achieve a good matching effect with the unbalanced reaction force of the relay contact system, thereby ensuring the contact reliability and vibration resistance of its contact system.

[0004] To achieve the above object, the present invention is achieved through the following technical solutions: A relay magnetic circuit structure includes a coil assembly, a first yoke and a second yoke respectively connected to the two ends of the coil assembly, and a seesaw armature rotatably arranged between the first yoke and the second yoke through a rotating shaft structure and used in conjunction with the first yoke and the second yoke. The rotating fulcrum of the seesaw armature is eccentrically arranged so that the seesaw armature forms a long force arm end arranged opposite to the first yoke and a short force arm end arranged opposite to the second yoke, and a first permanent magnet is arranged on the pole surface side of the long force arm end, and a second permanent magnet is arranged on the pole surface side of the short force arm end, and the magnetic force of the second permanent magnet is greater than that of the first permanent magnet.

[0005] Furthermore, the first yoke and the second yoke are both L-shaped structures, the first yoke is formed with a first mating end for mating with the long arm end of the seesaw armature, and the second yoke is formed with a second mating end for mating with the short arm end of the seesaw armature.

[0006] Furthermore, the long arm end is configured to be normally open with the first yoke, and the short arm end is configured to be normally closed with the second yoke.

[0007] Furthermore, the length of the second mating end is greater than that of the first mating end.

[0008] Furthermore, the first permanent magnet is arranged at or near the center of the seesaw armature in the length direction.

[0009] Furthermore, the rotation fulcrum of the rocker armature is biased toward the second yoke side.

[0010] Further, the long arm end of the seesaw armature is combined with the first permanent magnet to form a first part, the short arm end of the seesaw armature is combined with the second permanent magnet to form a second part, and the weight of the first part is configured to be roughly balanced with the weight of the second part.

[0011] Furthermore, the seesaw armature includes an armature body and a rotating seat fixedly connected to the bottom of the armature body, a rotating seat is provided with a rotating shaft mounting hole, a rotating shaft is connected to the rotating shaft mounting hole, and the rotating seat is provided with two first embedding grooves and second embedding grooves respectively located on both sides of the rotating shaft mounting hole, the first permanent magnet and the second permanent magnet are respectively adaptively embedded and fixed in the first embedding groove and the second embedding groove, a non-magnetic shaft frame is connected between the first yoke and the second yoke, and the rotating shaft is rotatably connected to the shaft frame.

[0012] Furthermore, a riveting column is provided on the rotating seat, a riveting hole is opened on the armature body, and the rotating seat is fixedly connected to the bottom position of the armature body through riveting cooperation between the riveting column and the riveting hole.

[0013] Based on the same inventive concept, the present invention also provides a relay, comprising any of the relay magnetic circuit structures described above.

[0014] The above technical solution has the following advantages or beneficial effects:

[0015] In the relay magnetic circuit structure and the relay described in the present invention, the magnetic circuit structure adopts a dual magnetic steel structure, and the magnetic forces of the two magnetic steels are different in size and the arrangement is also asymmetrical. Compared with the seesaw type balanced magnetic circuit structure, it is more flexible in controlling the suction force. During the design and debugging stages, the trend of the suction curve can be controlled by changing the size and relative position of the two magnetic steels to achieve a good matching effect with the unbalanced reaction force of the relay contact system, thereby ensuring the contact reliability and vibration resistance of its contact system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a relay according to an embodiment of the present invention.

[0017] Figure 2 4 is a cross-sectional view of the structure of a relay according to an embodiment of the present invention.

[0018] Figure 3Schematic diagram of the magnetic circuit structure of a relay according to an embodiment of the present invention.

[0019] Figure 4 It is a structural schematic diagram of a seesaw armature in a relay magnetic circuit structure in an embodiment of the present invention in a disconnected state.

[0020] Figure 5 It is a structural schematic diagram of a seesaw armature in a relay magnetic circuit structure in an embodiment of the present invention in an attracted state.

[0021] Figure 6 It is a schematic diagram of the decomposed structure of the magnetic circuit structure of an embodiment of the present invention.

[0022] Figure 7 Schematic diagram of the exploded structure of the seesaw armature according to an embodiment of the present invention.

[0023] Figure 8 It is a magnetic field distribution diagram of the relay magnetic circuit structure of the embodiment of the present invention when the plate-type armature is in a disconnected state.

[0024] Fig. 9 It is a magnetic field distribution diagram of the relay magnetic circuit structure of the embodiment of the present invention when the plate-type armature is in the attracted state.

[0025] Description of labels:

[0026] 1. Coil assembly, 2. First yoke, 3. Second yoke, 4. Seesaw armature, 5. First permanent magnet, 6. Second permanent magnet, 7. Axle frame, 21. First mating end, 31. Second mating end, 41. Armature body, 42. Rotating seat, 43. Rotating shaft, 421. Rotating shaft mounting hole, 422. First embedding groove, 423. Second embedding groove, 424. Riveted column. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Please refer to the attached Figure 1 To Attachment Fig. 9An embodiment of the present invention provides a relay magnetic circuit structure, including a coil assembly 1, a first yoke 2 and a second yoke 3 respectively connected to the two ends of the coil assembly 1, and a seesaw armature 4 rotatably arranged between the first yoke 2 and the second yoke 3 through a rotating shaft structure and used in conjunction with the first yoke 2 and the second yoke 3, the rotation fulcrum of the seesaw armature 4 is eccentrically arranged (i.e., deviated from the center position of the seesaw armature 4 in the length direction) so that the seesaw armature 4 forms a long lever arm end arranged opposite to the first yoke 2 and a short lever arm end arranged opposite to the second yoke 3, the long lever arm end is configured to be normally open with the first yoke 2, the short lever arm end is configured to be normally closed with the second yoke 3, and a first permanent magnet 5 is provided on the pole face side of the long lever arm end, and a second permanent magnet 6 is provided on the pole face side of the short lever arm end, and the magnetic force and weight of the second permanent magnet 6 are greater than those of the first permanent magnet 5. It can be understood that in this embodiment, the magnetic circuit structure adopts a dual magnetic steel structure (permanent magnet), and the magnetic forces of the two magnetic steels are different in size and the arrangement is also asymmetrical. Compared with the seesaw type balanced magnetic circuit structure, it is more flexible in controlling the suction force. During the design and debugging stages, the trend of the suction curve can be controlled by changing the size and relative position of the two magnetic steels to achieve a good matching effect with the unbalanced reaction force of the relay contact system, thereby ensuring the contact reliability and vibration resistance of its contact system.

[0030] Please refer to the attached Figure 1 To Attachment Fig. 9 In one preferred embodiment, the first yoke 2 and the second yoke 3 are both L-shaped structures, and the first yoke 2 is formed with a first mating end 21 for mating with the long arm end of the seesaw arm 4, and the second yoke 3 is formed with a second mating end 31 for mating with the short arm end of the seesaw arm 4.

[0031] Please refer to the attached Figure 1 To Attachment Fig. 9In one preferred embodiment, the rotation fulcrum of the seesaw armature 4 is biased toward the second yoke 3, and the length of the second mating end 31 is greater than the first mating end 21. The first permanent magnet 5 is arranged at the center position of the seesaw armature 4 in the length direction or close to its center position. In this embodiment, the first permanent magnet 5 with small volume (weight) and small magnetic force is arranged at the center position of the seesaw armature 4 in the length direction or close to its center position (i.e., on the pole face of the normally open end), and the second permanent magnet 6 with large volume (weight) and large magnetic force is arranged at the short force arm end (i.e., on the pole face side of the normally closed end). This is mainly due to the fact that the armature will be affected by the reaction force of the feedback of the contact system to a certain extent at the normally closed end. Therefore, the armature must have sufficient holding force at the normally closed end to maintain the stability of the contact system. By arranging the second permanent magnet 6 with large magnetic force on the pole face side of the normally closed end of the armature, the normally closed state can be effectively increased. The holding force of the state is improved to improve its contact reliability and vibration resistance. The main principle is that after the second permanent magnet 6 with large magnetic force is close to the normally closed end pole surface, the leakage magnetic flux of the magnetic steel is reduced, which mainly enhances the second magnetic circuit of the normally closed end pole surface (the additional magnetic circuit generated by the second permanent magnet 6). Secondly, the main magnetic circuit generated by the coil being energized is also increased to a certain extent, and the magnetic field density of the normally closed end pole surface is increased, and ultimately the holding force is improved. The first permanent magnet 5 with small magnetic force is set at the center position of the seesaw armature 4 in the length direction or close to its center position, which can appropriately enhance the suction force of the attraction process, but will not cause excessive suction at the end of the attraction.

[0032] Please refer to the attached Figure 7 To Attachment Fig. 9 In one preferred embodiment, the long arm end of the seesaw armature 4 is combined with the first permanent magnet 5 to form a first part, and the short arm end of the seesaw armature 4 is combined with the second permanent magnet 6 to form a second part, and the weight of the first part is configured to be roughly balanced with the weight of the second part. In this way, a structure with an unbalanced arm but balanced mass is formed to improve the sensitivity and vibration resistance of the armature action.

[0033] Please refer to the attached Figure 3 To Attachment Figure 7 In one preferred embodiment, the seesaw armature 4 includes an armature body 41 and a rotating seat 42 fixedly connected to the bottom of the armature body 41, a rotating shaft mounting hole 421 is provided on the rotating seat 42, a rotating shaft 43 is connected to the rotating shaft mounting hole 421, and two first embedding grooves 422 and second embedding grooves 423 are provided on the rotating seat 42, which are respectively located on both sides of the rotating shaft mounting hole 421, the first permanent magnet 5 and the second permanent magnet 6 are respectively embedded and fixed in the first embedding groove 422 and the second embedding groove 423, a non-magnetic shaft frame 7 is connected between the first yoke 2 and the second yoke 3, and the rotating shaft 43 is rotatably connected to the shaft frame 7.

[0034] Please refer to the attached Figure 3 To Attachment Figure 7 In one preferred embodiment, a rivet post 424 is provided on the rotating seat 42, a rivet hole is provided on the armature body 41, and the rotating seat 42 is fixedly connected to the bottom of the armature body 41 by riveting the rivet post 424 and the rivet hole. However, those skilled in the art should understand that in other embodiments, the rotating seat 42 and the armature body 41 may also be connected by other conventional connection structures, and are not limited to the specific implementation disclosed in this embodiment.

[0035] Please refer to the attached Figure 1 To Attachment Fig. 9 An embodiment of the present invention also provides a relay, comprising the relay magnetic circuit structure of any of the above embodiments.

[0036] As described above, the embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements do not deviate the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Claims

1. A relay magnetic circuit structure, comprising a coil assembly (1), a first yoke (2) and a second yoke (3) respectively connected to two ends of the coil assembly (1), and a seesaw armature (4) rotatably disposed between the first yoke (2) and the second yoke (3) through a rotating shaft structure and used in conjunction with the first yoke (2) and the second yoke (3), characterized in that: The rotation fulcrum of the seesaw armature (4) is eccentrically arranged so that the seesaw armature (4) forms a long force arm end arranged opposite to the first yoke (2) and a short force arm end arranged opposite to the second yoke (3), and a first permanent magnet (5) is arranged on the pole surface side of the long force arm end, and a second permanent magnet (6) is arranged on the pole surface side of the short force arm end, and the magnetic force of the second permanent magnet (6) is greater than that of the first permanent magnet (5).

2. The relay magnetic circuit structure according to claim 1, characterized in that: The first yoke (2) and the second yoke (3) are both L-shaped structures; the first yoke (2) is formed with a first mating end (21) for mating with a long force arm end of a seesaw armature (4); the second yoke (3) is formed with a second mating end (31) for mating with a short force arm end of a seesaw armature (4).

3. The relay magnetic circuit structure according to claim 2, characterized in that: The long arm end is configured to be in a normally open state with the first yoke (2), and the short arm end is configured to be in a normally closed state with the second yoke (3).

4. The relay magnetic circuit structure according to claim 2, characterized in that: The second mating end (31) is longer than the first mating end (21).

5. The relay magnetic circuit structure according to claim 1, characterized in that: The first permanent magnet (5) is arranged at the center position of the seesaw armature (4) in the length direction or close to the center position thereof.

6. The relay magnetic circuit structure according to claim 1, characterized in that: The rotation fulcrum of the rocker armature (4) is biased toward one side of the second yoke (3).

7. The relay magnetic circuit structure according to claim 1, characterized in that: The long arm end of the seesaw armature (4) is combined with the first permanent magnet (5) to form a first part, and the short arm end of the seesaw armature (4) is combined with the second permanent magnet (6) to form a second part. The weight of the first part is configured to be roughly balanced with the weight of the second part.

8. The relay magnetic circuit structure according to any one of claims 1 to 7, characterized in that: The seesaw armature (4) comprises an armature body (41) and a rotating seat (42) fixedly connected to the bottom of the armature body (41); a rotating shaft mounting hole (421) is provided on the rotating seat (42); a rotating shaft (43) is connected to the rotating shaft mounting hole (421); and two first embedded grooves (422) and second embedded grooves (423) are provided on the rotating seat (42) and are respectively located on two sides of the rotating shaft mounting hole (421); a first permanent magnet (5) and a second permanent magnet (6) are respectively embedded and fixed in the first embedded groove (422) and the second embedded groove (423); a non-magnetic shaft frame (7) is connected between the first yoke (2) and the second yoke (3); and the rotating shaft (43) is rotatably connected to the shaft frame (7).

9. The relay magnetic circuit structure according to claim 8, characterized in that: A rivet column (424) is provided on the rotating seat (42), a rivet hole is provided on the armature body (41), and the rotating seat (42) is fixedly connected to the bottom of the armature body (41) through riveting cooperation between the rivet column (424) and the rivet hole.

10. A relay, characterized in that: The relay magnetic circuit structure comprises any one of claims 1 to 9.

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