Electromagnetic assembly and electromagnetic relay

Abstract

The electromagnetic assembly comprises an iron core assembly, a coil assembly and a yoke assembly, the yoke assembly is provided with a containing cavity, and the coil assembly is installed in the containing cavity and provided with a first through hole extending in the first direction; the iron core assembly penetrates through the first through hole and is provided with a movable iron core; a second through hole is formed in the side wall, in the first direction, of the containing cavity, the movable iron core penetrates through the second through hole, and a gap is formed between the periphery of the movable iron core and the inner wall of the second through hole; the magnetic isolation sleeve is inserted into the gap and is provided with a third through hole for the movable iron core to penetrate through, the magnetic isolation sleeve is fixed relative to the yoke assembly and isolates the contact between the movable iron core and the yoke assembly, and the attraction between the movable iron core and the yoke assembly when the movable iron core and the yoke assembly are magnetized is reduced through the magnetic isolation sleeve. And the moving direction of the iron core can be corrected, and normal movement of the iron core is ensured.

Description

Technical Field

[0001] The utility model relates to the field of relays, in particular to an electromagnetic component and an electromagnetic relay. Background Art

[0002] Currently, in the magnetic circuit of relays or electromagnets, the common moving iron core and yoke configuration is one in which the tail of the moving iron core passes through a clearance hole in the yoke. When energized, the moving iron core is attracted to the stationary iron core by the magnetic field and moves toward it. The forces of attraction from the clearance hole on the yoke around the moving iron core, provided the air gap is uniform, cancel each other out and do not affect the normal movement of the moving iron core. However, in practice, due to external factors such as shock and vibration, or due to inherent precision limitations in the machining of the components, the moving iron core may become skewed during movement. This can cause the air gap between the moving iron core and the clearance hole to change, or direct contact between the moving iron core and the yoke to cause localized "magnetic surges." This can increase the horizontal attraction of the yoke on the moving iron core, causing the yoke to cling to the moving iron core, disrupting the normal axial movement of the moving iron core and further affecting the normal operation of the mechanism. Furthermore, to enhance the magnetic circuit strength of the magnetic circuit, a smaller air gap between the yoke and the moving iron core increases the magnetic circuit strength, but this also requires higher precision in the matching process. Utility Model Content

[0003] The main purpose of the present utility model is to overcome the defects in the coordination between the iron core and the yoke in the prior art, and to propose an electromagnetic assembly and an electromagnetic relay, which use a magnetic isolation sleeve to isolate the contact between the moving iron core and the yoke assembly to reduce the attraction between the two when magnetized, and can also correct the direction of movement of the iron core to ensure the normal movement of the moving iron core.

[0004] The utility model adopts the following technical solutions:

[0005] An electromagnetic component includes a core component, a coil component and a yoke component, the yoke component is provided with a accommodating cavity, the coil component is installed in the accommodating cavity and is provided with a first through hole extending along a first direction; the core component is passed through the first through hole and is provided with a moving iron core; a second through hole is provided on the side wall of the accommodating cavity in the first direction, the moving iron core passes through the second through hole, and there is a gap between the outer periphery of the moving iron core and the inner wall of the second through hole; it also includes a magnetic isolation sleeve, the magnetic isolation sleeve is inserted into the gap and is provided with a third through hole for the moving iron core to pass through, the magnetic isolation sleeve is fixed relative to the yoke assembly and isolates the contact between the moving iron core and the yoke assembly, and the magnetic isolation sleeve is used to reduce the suction force between the moving iron core and the yoke assembly when the two are magnetized.

[0006] Furthermore, the magnetic isolation sleeve is provided with a rib on the side opposite to the accommodating cavity in the first direction, and the rib extends radially outward along the third through hole; a first annular groove is provided on the side opposite to the first through hole and the rib, and the rib is partially embedded in the first annular groove.

[0007] Furthermore, the coil assembly includes a skeleton and a coil, and the skeleton is provided with radially extending fixing plates on both sides of the first direction, and the first through hole passes through the fixing plates; the fixing plate opposite to the magnetic isolation sleeve is provided with the first annular groove to press the magnetic isolation sleeve.

[0008] Furthermore, the radial dimension of the second through hole is smaller than the radial dimension of the first through hole. The moving iron core is further divided into a first section and a second section in the first direction, the first section is located in the first through hole, and the second section is passed through the second through hole and has a radial dimension smaller than the radial dimension of the first section.

[0009] Furthermore, a step portion is formed at the junction of the first section and the second section so as to abut against the magnetic isolation sleeve to achieve position limiting and buffering when the moving iron core moves back in the first direction.

[0010] Furthermore, second through holes are respectively provided on the two side walls of the accommodating cavity in the first direction; the iron core assembly also includes a static iron core, a rod body and an elastic member; the static iron core is fixed to the side of the first through hole away from the magnetic isolation sleeve in the first direction and passes through the corresponding second through hole, and there is a gap between the static iron core and the moving iron core; the rod body passes through the moving iron core and the static iron core along the first direction and is fixed relative to the moving iron core; the elastic member is arranged between the moving iron core and the static iron core.

[0011] Furthermore, the magnetic isolation sleeve is made of non-magnetic or weakly magnetic metal material.

[0012] Furthermore, the yoke assembly includes a first yoke and a second yoke, and the two opposite sides of the second yoke are respectively provided with bending portions, and the bending portions extend along the first direction and are fixed to the two opposite sides of the first yoke to form the accommodating cavity; the first yoke is provided with the second through hole; and the two sides of the coil assembly in the first direction are respectively fixed to the first yoke and the second yoke.

[0013] An electromagnetic relay comprises a housing and a contact system; the housing is provided with a first cavity and a second cavity; the contact system is located in the first cavity; and further comprises an electromagnetic component, which is located in the second cavity.

[0014] Furthermore, the second cavity is provided with a mounting column extending along the first direction, and the side of the yoke assembly in the second direction is provided with a protrusion, and the protrusion is connected to the mounting column.

[0015] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. In the present invention, a gap is provided between the outer periphery of the moving iron core and the inner wall of the second through hole of the yoke assembly. A magnetic isolation sleeve is inserted into the gap and fixed relative to the yoke assembly. The magnetic isolation sleeve is utilized to separate the moving iron core from the yoke assembly, thereby reducing the attraction between the moving iron core and the yoke assembly when they are magnetized, thereby avoiding affecting the normal movement of the moving iron core. The magnetic isolation sleeve also corrects the movement process of the moving iron core, thereby preventing it from skewing, thereby making the air gap between the moving iron core and the yoke assembly equal.

[0017] 2. In the present invention, a rib is provided on the magnetic isolation sleeve, and a first annular groove is provided on the fixing plate of the coil assembly. When the coil assembly and the yoke assembly are fixed, the rib can be pressed tightly against the yoke assembly, which makes installation simple and the structure reliable.

[0018] 3. In the present invention, the magnetic isolation sleeve is made of non-magnetic or weakly magnetic metal material, such as copper, which can prevent scraping and collision caused by the movement of the moving iron core; the magnetic isolation sleeve is used to separate the moving iron core and the yoke assembly, which can enhance the magnetic circuit strength by reducing the air gap between the moving iron core and the yoke assembly, and can also prevent the moving iron core from directly contacting the yoke assembly due to impact vibration or skew caused by parts processing accuracy, resulting in excessive suction and affecting the normal movement of the moving iron core.

[0019] 4. In the present invention, the radial dimension of the second through hole is set to be smaller than the radial dimension of the first through hole, and the moving iron core is divided into a first end and a second section with different radial dimensions. A step portion is formed at the junction of the first section and the second section to abut against the magnetic isolation sleeve to achieve limiting and buffering when the moving iron core moves back in the first direction. At the same time, the retaining edge can also reduce the suction force between the step portion and the yoke assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a portion of the electromagnetic assembly structure;

[0021] Figure 2 This is the structure diagram of the magnetic isolation sleeve;

[0022] Figure 3 for Figure 1 Exploded view of

[0023] Figure 4 It is the structure diagram of electromagnetic component;

[0024] Figure 5 for Figure 4 sectional view of

[0025] Figure 6 This is a cross-sectional view of an electromagnetic relay.

[0026] in:

[0027] 10. Core assembly; 11. Moving core; 12. Stationary core; 13. Rod; 14. Elastic member; 15. Step portion; 16. First section; 17. Second section; 20. Coil assembly; 21. Skeleton; 22. Coil; 23. Fixing plate; 24. First through hole; 25. First annular groove; 30. Yoke assembly; 31. First yoke; 32. Second yoke; 33. Accommodating cavity; 34. Second through hole; 35. Protrusion; 36. Bend portion; 40. Magnetic isolation sleeve; 41. Retaining edge; 42. Third through hole; 50. Housing; 51. First cavity; 52. Second cavity; 53. Mounting column; 60. Contact system.

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0029] The present invention is further described below through specific implementation methods.

[0030] See also Figures 1 to 5 , an electromagnetic component, including a core component 10, a coil component 20, a yoke component 30 and a magnetic isolation sleeve 40. The yoke component 30 is provided with a accommodating chamber 33, and the accommodating chamber 33 is provided with side walls on both sides of the first direction and the second direction respectively. The coil component 20 is installed in the accommodating chamber 33, and the coil component 20 is relatively fixed to the side wall of the accommodating chamber 33 and is provided with a first through hole 24 extending along the first direction. The core component 10 is passed through the first through hole 24, and the core component 10 is provided with a moving iron core 11, and the moving iron core 11 can move along the first direction under the action of the magnetic field. A second through hole 34 is provided on the side wall of the accommodating chamber 33 in the first direction, and the moving iron core 11 passes through the second through hole 34, and there is a gap between the outer periphery of the moving iron core 11 and the inner wall of the second through hole 34.

[0031] A magnetic isolation sleeve 40 is inserted into the gap and is provided with a third through-hole 42 for the movable core 11 to pass through. The magnetic isolation sleeve 40 is fixed relative to the yoke assembly 30. The thickness of the magnetic isolation sleeve 40 is appropriately set according to the gap without affecting the movement of the movable core 11, for example, 0.2 mm. By using the magnetic isolation sleeve 40 to separate the movable core 11 from the yoke assembly 30, the attractive force between the movable core 11 and the yoke assembly 30 is reduced when the movable core 11 and the yoke assembly 30 are magnetized, thereby avoiding the risk of the movable core 11 being unable to move normally due to excessive attractive force between the two.

[0032] The magnetic isolation sleeve 40 also corrects the movement of the movable iron core 11, preventing it from skewing, ensuring a uniform air gap between the movable iron core 11 and the yoke assembly 30, and ensuring normal movement of the movable iron core 11. Furthermore, the presence of the magnetic isolation sleeve 40 allows the air gap between the movable iron core 11 and the yoke assembly 30 to be smaller, thereby increasing the strength of the magnetic circuit. For example, the air gap between the movable iron core 11 and the yoke assembly 30 can be reduced by reducing the thickness of the magnetic isolation sleeve 40.

[0033] The magnetic isolation sleeve 40 is a sleeve structure that passes through in the first direction, and the fixing method between the magnetic isolation sleeve 40 and the yoke assembly 30 can be achieved by a common fixing method. In this embodiment, the magnetic isolation sleeve 40 is pressed by the cooperation between the components. Specifically, the magnetic isolation sleeve 40 is provided with a rib 41 on the side opposite to the accommodating cavity 33 in the first direction. The rib 41 extends radially outward along the third through hole 42, and the rib 41 is close to the corresponding side wall of the accommodating cavity. A first annular groove 25 is provided on the side opposite to the first through hole and the rib 41 on the coil assembly 20. The first annular groove 25 is a groove, and a part of the rib 41, that is, the outer edge, is embedded in the first annular groove. Then, while the coil assembly 20 is fixed to the yoke assembly 30, the rib 41 can be pressed against the yoke assembly 30. In actual applications, the shape of the magnetic isolation sleeve 40 is not limited to this, and can also be adjusted according to different fixing methods.

[0034] Furthermore, the coil assembly 20 includes a frame 21 and a coil 22. The frame 21 is provided with radially extending fixing plates 23 on either side of the frame 21 in the first direction. The two fixing plates 23 and the main body of the frame 21 form a wire slot, and the coil 22 is wound within the wire slot. A first through hole 24 extends through both fixing plates 23. The fixing plate 23 opposite the magnetic isolation sleeve 40 is provided with the aforementioned first annular groove 25. When the fixing plate 23 with the first annular groove 25 is secured to the yoke assembly 30, it can compress the outer edge of the retaining edge 41 of the magnetic isolation sleeve 40.

[0035] In this embodiment, the radial dimension of the second through-hole 34 is smaller than that of the first through-hole 24. Accordingly, the movable iron core 11 is further divided into a first section 16 and a second section 17 in the first direction. The first section 16 is located within the first through-hole 24, and the second section 17 is disposed through the second through-hole 34 and has a smaller radial dimension than the first section 16. Setting the radial dimensions of the first and second through-holes 24 and 34 to be different, and correspondingly dividing the first movable iron core 11 into two sections of different radial dimensions, this structure can limit the movement of the movable iron core 11.

[0036] Specifically, a step portion 15 is formed at the junction of the first section 16 and the second section 17, and the moving iron core 11 moves back in the first direction, that is, when the moving iron core 11 moves toward the direction of the magnetic isolation sleeve 40, it stops when the step portion 15 abuts against the retaining edge 41, that is, the magnetic isolation sleeve 40 can also achieve the functions of limiting and buffering shock absorption.

[0037] In addition, due to the action of the retaining edge 41, the air gap between the step portion 15 and the corresponding side walls of the accommodating cavity 33 is equal, and the retaining edge 41 also isolates the direct contact between the step portion 15 and the yoke assembly 30. Therefore, when the moving iron core 11 and the yoke assembly 30 are magnetized, the suction force between the step portion 15 and the yoke assembly 30 is also reduced.

[0038] Second through holes 34 are provided on both side walls of the accommodating cavity 33 in the first direction. A magnetic isolation sleeve 40 is provided in the second through hole 34 through which the movable iron core 11 passes. The other second through hole 34 may not be provided with a magnetic isolation sleeve 40. The core assembly 10 further includes a static iron core 12, a rod 13, and an elastic member 14. The static iron core 12 is fixed to the side of the first through hole 24 away from the magnetic isolation sleeve 40 in the first direction and passes through the corresponding second through hole 34, that is, the movable iron core 11 and the static iron core 12 pass through the two second through holes 34 respectively. There is a gap between the static iron core 12 and the movable iron core 11. The rod 13 passes through the movable iron core 11 and the static iron core 12 along the first direction and is fixed relative to the movable iron core 11. The elastic member 14 is provided between the movable iron core 11 and the static iron core 12. The elastic member 14 is sleeved on the outside of the rod 13 and is used to provide elastic force for the movable iron core 11 to return to its original position. The rod 13 also passes through the two first through holes 24.

[0039] The yoke assembly 30 is similar to a frame structure, which includes a first yoke 31 and a second yoke 32. The two opposite sides of the second yoke 32 are respectively provided with a bending portion 36. The bending portion 36 extends along the first direction and is fixed to the two opposite sides of the first yoke 31 to form a accommodating cavity 33. The first yoke 31 and the second yoke 32 can be fixed by riveting. A second through hole 34 is respectively provided on the first yoke 31 and the second yoke 32. The two sides of the coil assembly 20 in the first direction, that is, the two fixing plates 23, are respectively fixed to the first yoke 31 and the second yoke 32. In actual applications, the yoke assembly 30 can also be a structure of other combinations, not limited to this.

[0040] The magnetic isolation sleeve 40 in this embodiment is made of a non-magnetic or weakly magnetic metal material, such as copper, etc. The magnetic isolation sleeve 40 made of such a non-magnetic or weakly magnetic metal material can also effectively prevent hair scrapes generated by scratches and collisions when the moving iron core 11 moves.

[0041] Based on this, see Figure 6 This embodiment also proposes an electromagnetic relay, including a housing 50, a contact system 60 and the above-mentioned electromagnetic component; the housing 50 is provided with a first cavity 51 and a second cavity 52; the contact system 60 is located in the first cavity 51, which is used to perform operations such as opening or closing of the contacts; the electromagnetic component is located in the second cavity 52, which is used to control the action of the contact system 60.

[0042] The second cavity 52 is provided with mounting posts 53 extending along the first direction, and the first yoke 31 is provided with protrusions 35 on the sides in the second direction. The protrusions 35 and the mounting posts 53 are fixedly connected by screws, thereby securing the yoke assembly 30 within the second cavity 52. ​​Specifically, protrusions 35 are provided on both sides of the first yoke 31 in the second direction, and two mounting posts 53 are correspondingly provided in the second cavity 52. ​​The two mounting posts 53 are located on both sides of the yoke assembly 30 and are at the same height as the yoke assembly 30.

[0043] In this embodiment, the end of the rod 13 in the core assembly 10 is inserted into the first cavity 51, opposite the contact system 60. When the coil 22 of the coil assembly 20 is energized, a magnetic field is generated. The yoke assembly 30 guides the magnetic field generated by the coil 22 and enhances its intensity. In the energized state, the movable core 11 is magnetized by the magnetic field. Attracted by the stationary core 12, the movable core 11 overcomes the suction force of the first yoke 31 and the elastic force of the elastic member 14, and moves in the first direction toward the stationary core 12 under the correction of the magnetic isolation sleeve 40. In addition, because the suction forces on the movable core 11 around the second through hole 34 offset each other and do not affect the normal movement of the movable core 11, the rod 13 is driven by the movable core 11 to move, thereby controlling the operation of the contact system 60. When the coil 22 of the coil assembly 20 is de-energized, the magnetic field disappears, the contact system 60 returns to its original position, and the movable core 11 and rod 13 also return to their original positions.

[0044] In the present invention, the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence, nor can they be understood as indicating or implying relative importance. In the description, the directions or positional relationships indicated by "upper", "lower", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings. They are only used to facilitate the description of the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0045] In this application, unless otherwise specified, "plurality" refers to two or more. "And / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0046] The above is only a specific implementation method of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. An electromagnetic assembly comprising an iron core assembly, a coil assembly, and a yoke assembly, wherein the yoke assembly is provided with an accommodating cavity, the coil assembly is mounted in the accommodating cavity and is provided with a first through hole extending in a first direction; the iron core assembly is passed through the first through hole and is provided with a moving iron core; characterized in that: The accommodating cavity is provided with a second through hole on the side wall in the first direction, the moving iron core passes through the second through hole, and there is a gap between the outer periphery of the moving iron core and the inner wall of the second through hole; it also includes a magnetic isolation sleeve, which is inserted into the gap and provided with a third through hole for the moving iron core to pass through, the magnetic isolation sleeve is fixed relative to the yoke assembly and isolates the contact between the moving iron core and the yoke assembly, and the magnetic isolation sleeve is used to reduce the suction force between the moving iron core and the yoke assembly when they are magnetized.

2. The electromagnetic assembly according to claim 1, wherein: The magnetic isolation sleeve is provided with a rib on the side opposite to the accommodating cavity in the first direction, and the rib extends radially outward along the third through hole; the first through hole is provided with a first annular groove on the side opposite to the rib, and the rib is partially embedded in the first annular groove.

3. The electromagnetic assembly according to claim 2, wherein: The coil assembly includes a skeleton and a coil. The skeleton is provided with radially extending fixing plates on both sides of the first direction. The first through hole passes through the fixing plates. The fixing plate opposite to the magnetic isolation sleeve is provided with the first annular groove to press the magnetic isolation sleeve.

4. The electromagnetic assembly according to claim 1, wherein: The radial dimension of the second through hole is smaller than the radial dimension of the first through hole; the moving iron core is also divided into a first section and a second section in the first direction, the first section is located in the first through hole, and the second section is passed through the second through hole and its radial dimension is smaller than the radial dimension of the first section.

5. The electromagnetic assembly according to claim 4, wherein: A step portion is formed at the junction of the first section and the second section so as to abut against the magnetic isolation sleeve to achieve position limiting and buffering when the moving iron core moves back in the first direction.

6. The electromagnetic assembly according to claim 4, wherein: The accommodating cavity is respectively provided with second through holes on both side walls in the first direction; the iron core assembly also includes a static iron core, a rod body and an elastic member; the static iron core is fixed to the side of the first through hole away from the magnetic isolation sleeve in the first direction and passes through the corresponding second through hole, and there is a gap between the static iron core and the moving iron core; the rod body passes through the moving iron core and the static iron core along the first direction and is fixed relative to the moving iron core; the elastic member is arranged between the moving iron core and the static iron core.

7. The electromagnetic assembly according to claim 1, wherein: The magnetic isolation sleeve is made of non-magnetic or weakly magnetic metal material.

8. The electromagnetic assembly according to claim 1, wherein: The yoke assembly includes a first yoke and a second yoke, and the two opposite sides of the second yoke are respectively provided with a bending portion, and the bending portion extends along the first direction and is fixed to the two opposite sides of the first yoke to form the accommodating cavity; the first yoke is provided with the second through hole; the two sides of the coil assembly in the first direction are respectively fixed to the first yoke and the second yoke.

9. An electromagnetic relay comprising a housing and a contact system; the housing is provided with a first cavity and a second cavity; the contact system is located in the first cavity; and characterized in that: It also includes an electromagnetic assembly according to any one of claims 1 to 8, wherein the electromagnetic assembly is located in the second cavity.

10. The electromagnetic relay according to claim 9, wherein: The second cavity is provided with a mounting column extending along the first direction, and the side of the yoke assembly in the second direction is provided with a protrusion, and the protrusion is connected to the mounting column.

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