Coil rack and iron core matching structure, magnetic circuit part and electromagnetic relay

Abstract

The utility model discloses a matching structure of a coil rack and an iron core, a magnetic circuit part and an electromagnetic relay, the matching structure comprises the coil rack and the iron core arranged in the coil rack, and the coil rack is provided with a winding part for winding an enameled wire; the outer contour of the cross section of the winding part is non-circular, and the outer peripheral surface of the winding part comprises a convex cambered surface; the number of the iron cores is multiple, the multiple iron cores are respectively in a rod shape, and the multiple iron cores are parallel to one another. Under the condition that the space size of the relay is small, the problems of winding size, electromagnetic attraction, enameled wire cost, iron core cost and the like of the coil rack can be considered, the overall cost of the relay is reduced, and the electromagnetic attraction of the magnetic circuit part of the relay is ensured to be large enough.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a matching structure of a coil bobbin and an iron core, a magnetic circuit part and an electromagnetic relay. Background Art

[0002] As an electronic control device, a relay functions to control a large current with a small current and is widely used in automatic control circuits, playing roles such as automatic regulation, safety protection, and circuit conversion in the circuit. With the increasingly fierce market competition and the diversification of the actual applications of relays, requirements for small size, low cost, and high performance are put forward for relays.

[0003] A relay mainly consists of a contact part and a magnetic circuit part. Generally, the coil in the magnetic circuit part provides electromagnetic suction, and the contact part provides a reaction force. The matching degree between the electromagnetic suction and the reed reaction force directly affects the number of electrical durability times of the relay. Therefore, as the source of suction, the rationality of the coil structure has an important impact on the suction value. At the same time, the coil structure also directly affects the size of the enameled wire winding. That is, the costs of coils with different structures vary greatly. Therefore, the coil cost cannot be ignored for the overall cost of the relay. How to optimize the coil structure is very necessary for obtaining the best electromagnetic suction and the optimal cost.

[0004] The magnetic circuit part of the existing technology relay includes a coil bobbin, an iron core, a yoke iron, etc. The shape of the coil bobbin tube wall is mostly a single circle or square. The iron core is either a circular iron core or a square iron core, or there is also a structure in which several square iron cores are laminated into an integral square iron core. Under the same cross-sectional area of the iron core, the circumference of the circular iron core is smaller than that of the square iron core. The same length of enameled wire can be wound with more turns, and the coil electromagnetic suction ampere-turns (IN) are larger. After winding, the coil is also close to a circle, and its winding radius is R. For the square iron core structure, after the coil is wound, its winding length is L and width is W, and R is between L and W. Therefore, in the case where there are restrictions on the internal space size of the relay, the circular iron core is not applicable at this time. The existing technical solutions adopt a square iron core structure. The coil of the square iron core structure has strong adaptability to the internal space size of the relay, but its disadvantages are low utilization rate of enameled wire, high coil cost, relatively large long-side dimension of the winding, and at the same time, the square iron core parts need to be formed by die stamping, with low material utilization rate and high part processing cost, so the cost of the relay will be further increased. Summary of the Utility Model

[0005] Aiming at the technical problems existing in the prior art, the utility model provides a matching structure of a coil bobbin and an iron core, a magnetic circuit part and an electromagnetic relay. Through structural improvement, it can take into account problems such as coil winding size, electromagnetic suction, coil cost, and iron core cost.

[0006] The technical solution adopted by the present utility model to solve its technical problems is: a coil bobbin and iron core matching structure, including a coil bobbin and an iron core disposed in the coil bobbin. The coil bobbin has a winding portion for winding enameled wire; the outer contour of the cross-section of the winding portion is non-circular, and the outer peripheral surface of the winding portion includes a convex arc surface; the number of iron cores is multiple, and the multiple iron cores are respectively in a rod shape and are parallel to each other.

[0007] Further, the outer contour of the cross-section of the winding portion is flat, and the outer peripheral surfaces on both sides of the winding portion in the length direction of the cross-section of the winding portion are respectively convex arc surfaces; the multiple iron cores are arranged along the length direction of the cross-section of the winding portion and are located on the center line of the cross-section of the winding portion in the length direction.

[0008] Further, the side surfaces of adjacent iron cores are in contact with each other.

[0009] Further, the inner cavity of the coil bobbin includes a plurality of iron core cavities corresponding to the multiple iron cores one by one. The shape and size of the cross-section of the iron core cavity respectively match the shape and size of the cross-section of the iron core; the multiple iron cores are respectively inserted into the corresponding iron core cavities.

[0010] Further, the multiple iron core cavities are arranged along the length direction of the cross-section of the winding portion, and adjacent iron core cavities are laterally connected.

[0011] Further, the outer contour of the cross-section of the winding portion is oval, or the outer contour of the cross-section of the winding portion is runway-shaped.

[0012] Further, the cross-section of the iron core is circular, both ends of the iron core are respectively located outside the coil bobbin, and the diameters of the ends of both ends of the iron core are respectively smaller than the diameter of the portion of the iron core between its two ends.

[0013] The present utility model further provides a magnetic circuit part, including a yoke, and further including the coil bobbin and iron core matching structure as described above in the present utility model. The winding portion of the coil bobbin is wound with enameled wire. The yoke is partially fitted at one end in the axial direction of the coil bobbin and is fixedly connected to the multiple iron cores.

[0014] Further, the yoke is in an L shape, and the number of yokes is two. One side of the two yokes is respectively fitted at both ends in the axial direction of the coil bobbin. One end of each of the multiple iron cores is riveted and fixed to one side of one of the yokes, and the other end of each of the multiple iron cores is riveted and fixed to one side of the other yoke. The other sides of the two yokes are located on the same side of the coil bobbin and are oppositely arranged; further including an armature part which is rotatably arranged, and the other sides of the two yokes are respectively fitted in the depressions on both sides of the armature part.

[0015] The present utility model further provides an electromagnetic relay, which includes the magnetic circuit part as described in the above-mentioned present utility model.

[0016] Compared with the prior art, the present utility model has the following beneficial effects:

[0017] 1. Since the outer contour of the cross-section of the winding part of the coil bobbin is non-circular, and the outer peripheral surface of the winding part includes a convex arc surface, the structure of the coil bobbin of the present utility model has strong adaptability to the internal space size of the relay, is more conducive to reducing the occupied space, and compared with the coil bobbin whose cross-sectional outer contour of the winding part is square, under the same iron core cross-sectional area and the same length of enameled wire, more turns of enameled wire can be wound, thereby improving the utilization rate of the enameled wire and increasing the electromagnetic attraction. In addition, the number of iron cores of the present utility model is multiple, the multiple iron cores are respectively in a rod shape, and the multiple iron cores are parallel to each other, so that the present utility model can use the multiple iron cores to match with the winding part of the coil bobbin, and the iron cores do not need to be formed by die stamping, reducing the processing cost of the iron cores. Therefore, the present utility model can take into account problems such as the winding size of the coil bobbin, electromagnetic attraction, enameled wire cost and iron core cost under the condition of a small space size of the relay, which is not only beneficial to reducing the overall cost of the relay, but also ensuring that the electromagnetic attraction of the magnetic circuit part of the relay is large enough.

[0018] 2. The multiple iron cores are arranged along the length direction of the cross-section of the winding part and are located on the center line of the cross-section of the winding part in the length direction, so that the arrangement mode of the multiple iron cores is relatively simple and is easy to assemble and process. In particular, the side surfaces of adjacent iron cores are in contact with each other, so that the multiple iron cores are closely arranged, which is beneficial to reducing the space size of the entire coil bobbin.

[0019] 3. The inner cavity of the coil bobbin includes multiple iron core cavities corresponding to the multiple iron cores one by one, and the shape and size of the cross-section of each iron core cavity respectively match the shape and size of the cross-section of the iron core, so that the local wall thickness size of the winding part of the coil bobbin is larger, which is beneficial to improving the strength of the winding part of the coil bobbin, and making the winding part not easy to deform or even be damaged during the winding process.

[0020] The following further describes the present utility model in detail with reference to the drawings and embodiments; however, a coil bobbin and iron core matching structure, magnetic circuit part and electromagnetic relay of the present utility model are not limited to the embodiments. Description of the Drawings

[0021] Figure 1 is an exploded schematic view of the coil bobbin and iron core matching structure of the present utility model (including yoke iron and enameled wire);

[0022] Figure 2 is a three-dimensional structural schematic view of the coil bobbin of the present utility model;

[0023] Figure 3 is the top view of the coil holder of the present utility model;

[0024] Figure 4 is the three-dimensional structure schematic diagram of the iron core of the present utility model;

[0025] Figure 5 is the cooperation schematic diagram of the iron core and the yoke iron of the present utility model;

[0026] Figure 6 is the three-dimensional structure schematic diagram (excluding the armature part) of the magnetic circuit part of the present utility model;

[0027] Figure 7 is Figure 6 the cross-sectional schematic diagram of;

[0028] Figure 8 is the exploded schematic diagram of the electromagnetic relay of the present utility model;

[0029] Figure 9 is the three-dimensional structure schematic diagram (excluding the housing) of the electromagnetic relay of the present utility model;

[0030] Figure 10 is the cross-sectional view of the electromagnetic relay of the present utility model;

[0031] In the figure, 1. moving spring part, 11. moving spring lead-out piece, 12. moving spring piece, 121. sub-spring piece, 122. U-shaped bend, 123. hook, 13. moving contact, 2. pushing card, 21. card slot, 22. yielding through slot, 23. connecting slot, 3. base, 31. bottom plate, 311. guiding boss, 312. moving spring slot, 313. static spring slot, 32. surrounding wall, 321. installation slot, 322. accommodating slot, 4. armature part, 41. driving body, 42. armature, 43. permanent magnet, 5. rotating shaft, 6. coil part, 61. coil holder, 611. winding part, 612. flange part, 613. iron core cavity, 614. positioning slot, 62. enameled wire, 63. iron core, 631. end part, 64. yoke iron, 641. circular through hole, 7. static spring part, 71. static spring piece, 711. jack, 72. static contact, 8. guiding and limiting part, 9. arc separating part, 10. arc extinguishing permanent magnet, 20. magnetic isolation sheet, 30. housing, 40. auxiliary moving spring piece, 50. auxiliary static spring piece. Specific embodiments

[0032] In the present utility model, in the description, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", and "rear" is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model and does not indicate or imply that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In addition, in the description of the present utility model, unless otherwise specified, "a plurality of" means two or more. In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] Please refer to Figures 1-7 As shown, a cooperation structure between a coil bobbin and an iron core of the present utility model includes a coil bobbin 61 and an iron core 63 disposed in the coil bobbin 61. The coil bobbin 61 includes two flange portions 612 and a hollow winding portion 611 located between the two flange portions 612 and used for winding an enameled wire 62. The two flange portions 612 respectively protrude laterally from the winding portion 611. The outer contour of the cross-section of the winding portion 611 is non-circular, and the outer peripheral surface of the winding portion 611 includes a convex arc surface. Specifically, in this embodiment, the outer contour of the cross-section of the winding portion 611 is flat, but it is not limited thereto. In other embodiments, the outer contour of the cross-section of the winding portion is triangular, etc. The outer peripheral surface of the winding portion 611 is respectively a convex arc surface on both sides in the length direction of the cross-section of the winding portion 611. That is, the two sides of the outer contour of the cross-section of the winding portion 611 in its length direction are respectively convex arc sides, and the two sides of the outer contour of the cross-section of the winding portion 611 in its width direction are straight sides. Therefore, the outer contour of the cross-section of the winding portion 611 is generally in a runway shape, but it is not limited thereto. In other embodiments, the outer contour of the cross-section of the winding portion 611 is elliptical.

[0035] The number of the above-mentioned iron cores 63 is respectively a plurality. The plurality of iron cores 63 are parallel to each other, and each iron core 63 is respectively rod-shaped. Specifically, the cross-section of each iron core 63 is respectively circular, but it is not limited thereto. The plurality of iron cores 63 are respectively inserted into the coil bobbin 61, and each iron core 63 respectively extends along the axial direction of the coil bobbin 61.

[0036] In this embodiment, multiple iron cores 63 are arranged along the length direction of the cross-section of the winding portion 611 and are located on the center line of the cross-section of the winding portion 611 in the length direction. However, the arrangement form of the iron cores 63 is not limited to this. The side surfaces of adjacent iron cores 63 are in contact with each other, so that the multiple iron cores 63 are closely arranged, which is beneficial to reducing the space size of the bobbin 61.

[0037] In this embodiment, the inner cavity of the bobbin 61 includes multiple iron core cavities 613 corresponding to the multiple iron cores 63 one by one. The shape and size of the cross-section of the iron core cavity 613 respectively match the shape and size of the cross-section of the iron core 63; each iron core 63 is respectively inserted into the corresponding iron core cavity 613. Since the multiple iron cores 63 are arranged along the length direction of the cross-section of the winding portion 611, therefore, the multiple iron core cavities 613 are also arranged along the length direction of the cross-section of the winding portion 611, and adjacent iron core cavities 613 are laterally connected to each other, so that the side surfaces of adjacent iron cores 63 are in contact with each other.

[0038] In this embodiment, the number of the iron cores 63 is two, but it is not limited to this. In other embodiments, the number of the iron cores 63 is more than two. Therefore, the number of the iron core cavities 613 is also two. The two iron core cavities 613 are connected to each other to form a roughly "8" shape, as Figure 2 , Figure 3 shown.

[0039] In this embodiment, both ends of the iron core 63 are located outside the bobbin 61, and the diameters of the end portions 631 at both ends of the iron core 63 are respectively smaller than the diameter of the portion of the iron core 63 between its two ends, as Figure 4 shown. Both ends of the iron core 63 are used to connect the yoke iron 64. Specifically, the yoke iron 64 is connected by riveting: after the end portions 631 at both ends of the iron core 63 respectively pass through the circular through holes 641 provided on the corresponding yoke iron 64, the two ends of the iron core 63 are respectively riveted and fixed to the corresponding yoke iron 64 by means of flattening or pressing, as Figure 5 shown.

[0040] A coil holder and iron core matching structure of the present utility model. The structure of the coil holder 61 combines the advantages of two existing coil holders 61 (the cross-sectional outer contour of the winding part of one coil holder is circular, and the cross-sectional outer contour of the winding part of the other coil holder is square). It has strong adaptability to the internal space size of the relay, which is beneficial to reducing the occupied space. At the same time, compared with the coil holder with a square cross-sectional outer contour of the winding part in the prior art, under the condition of the same cross-sectional area and the same length of enameled wire, more turns of enameled wire can be wound, thereby improving the utilization rate of the enameled wire and further being beneficial to improving the electromagnetic attraction. In addition, in the coil holder 61 of the present utility model, a plurality of iron cores 63 are inserted. By matching the structure of the plurality of iron cores 63 with the winding part 611, it can be ensured that the overall cross-sectional magnetic conduction area of the plurality of iron cores 63 is relatively large, thereby improving the magnetic conduction performance. And the iron core 63 is in a rod shape, so that the iron core 63 does not need to be formed by die stamping, thereby reducing the processing cost of the iron core 63. Therefore, when the space size of the relay is small, the present utility model can take into account problems such as the winding size of the coil holder, electromagnetic attraction, enameled wire cost, and iron core cost, which is beneficial to reducing the overall cost of the relay and ensuring that the electromagnetic attraction of the magnetic circuit part of the relay is large enough.

[0041] Please refer to Figures 1-7 As shown, a magnetic circuit part of the present utility model includes a yoke 64, and also includes a coil holder and iron core matching structure of the present utility model as described above. The winding part 611 of the coil holder 61 is wound with an enameled wire 62. The yoke 64 is partially fitted at one end in the axial direction of the coil holder 61 and is fixedly connected to a plurality of iron cores 63.

[0042] In this embodiment, the yoke 64 is in an L shape, and the number of yokes 64 is two. One side of the two yokes 64 is respectively fitted at both ends of the coil holder 61 in the axial direction. One end of the plurality of iron cores 63 is respectively riveted and fixed to one side of one of the yokes 64, and the other end of the plurality of iron cores 63 is respectively riveted and fixed to one side of the other yoke 64. The other side of the two yokes 64 is located on the same side of the coil holder 61 and is arranged oppositely. The two flange parts 612 of the coil holder 61 are respectively provided with positioning grooves 614 corresponding to one side of the two yokes 64, and one end of the positioning groove 614 is provided with a notch. One side of the two yokes 64 is respectively received in the positioning grooves 614 of the two flange parts 612, as Figure 6 shown.

[0043] The magnetic circuit part of the present utility model further includes an armature part 4 (as Figures 8-10As shown in the figure, the armature part 4 is rotatably arranged, and the other sides of the two yokes 64 are respectively fitted into the depressions on both sides of the armature part 4. Specifically, the armature part 4 includes an insulating driving body 41 and an armature assembly arranged on the driving body 41. The armature assembly is in the shape of a capital "I", and its four ends respectively extend out of the driving body 41. Specifically, the armature assembly is composed of two parallel armatures 42 and a permanent magnet 43 clamped between the two armatures 41. The other side of one yoke 64 is fitted between the upper ends of the two armatures 42, and the other side of the other yoke 64 is fitted between the lower ends of the two armatures 42.

[0044] Therefore, the magnetic circuit part of the present utility model is the magnetic circuit part of a magnetic latching relay, but is not limited thereto. In other embodiments, the number of yokes is one, and the armature part is swingably arranged at the knife edge of the yoke. Therefore, the magnetic circuit part of the present utility model is the magnetic circuit part of a clapper electromagnetic relay.

[0045] Please refer to Figures 1-10 As shown in the figure, an electromagnetic relay of the present utility model includes a magnetic circuit part of the present utility model as described above. The electromagnetic relay of the present utility model further includes a base 3, a moving contact part 1, a static contact part 7, and a pushing card 2. The moving contact part 1 includes a movable reed 12 that can elastically deform, a moving contact lead-out piece 11, and a moving contact 13. The upper end of the movable reed 12 is fixedly connected to the upper end of the moving contact lead-out piece 11 by riveting. The moving contact 13 is arranged on the movable reed 12 and faces away from the moving contact lead-out piece 11. Specifically, the moving contact 13 is approximately riveted at the middle position of the movable reed 12. The static contact part 7 includes a static reed 71 and a static contact 72 arranged on the static reed 71. The static contact 72 cooperates with the moving contact 13. The base 3 includes a bottom plate 31 and two surrounding walls 32 protruding upward from the edge of the bottom plate 31. The two surrounding walls 32 are arranged opposite to each other. The lower end of the movable reed 12 is clamped in a card slot 21 provided on the pushing card 2, and the lower end of the moving contact lead-out piece 11 passes through a relief through slot 22 provided on the pushing card 2, so that the movable reed 12, the moving contact lead-out piece 11, and the pushing card 2 form a moving contact assembly. The moving contact assembly is loaded into the base 3 from top to bottom, and the lower end of the moving contact lead-out piece 1 is inserted into a moving contact slot 312 provided correspondingly on the bottom plate 31 of the base. The upper end of the static reed 71 is provided with the static contact 72, and the lower end of the static reed 71 is inserted into a static contact slot 313 provided correspondingly on the bottom plate 31 of the base.

[0046] Guide limit members 8 are respectively installed at the bottom parts of the two enclosing walls 32 of the base 3, and the guide limit members 8 perform upper limit and movement guidance on the push card 2. Specifically, installation grooves 321 penetrating the inner and outer wall surfaces are respectively provided at the bottom parts of the two enclosing walls 32 of the base 3. The guide limit members 8 are inserted into the installation grooves 321 from the outside of the enclosing walls 32, and a part of the guide limit members 8 penetrates out of the installation grooves 321 and protrudes from the inner side surface of the enclosing walls 32 to provide upper limit and movement guidance for the push card 2. In addition, a guide boss 311 is provided on the upper surface of the bottom plate 31, and the guide boss 311 provides support and movement guidance for the push card 2. Specifically, guide bosses 311 are respectively provided at the positions where the upper surface of the bottom plate 31 is connected to the two enclosing walls 32. The guide bosses 311 are strip-shaped and extend along the movement direction of the push card 2. The guide limit members 8 and the guide bosses 311 on the same side cooperate with each other to form a guide chute for the push card 2.

[0047] The above coil bobbin 61, enameled wire 62, yoke 64, and iron core 63 form a coil part 6. The coil part 6 is vertically arranged on the bottom plate 31 of the base. The driving body 41 of the above armature part 4 is rotatably connected between the two enclosing walls 32 of the base 3 by a rotating shaft 5. Therefore, the present utility model constitutes a magnetic latching relay, but is not limited thereto.

[0048] The present utility model further includes a housing 30. The bottom end of the housing 30 is connected to the base 3, and the static contact part 7, the moving contact part 1, the push card 2, the armature part 4, the coil part 6, etc. are accommodated in its housing cavity. The present utility model further includes an auxiliary moving reed 40 and an auxiliary static reed 50 inserted into the base 1. An auxiliary moving contact is provided on the auxiliary moving reed 40, and an auxiliary static contact is provided on the auxiliary static reed 50. The auxiliary moving contact and the auxiliary static contact cooperate with each other. The auxiliary moving reed 40 is driven by the armature part 4, and the closed state of the auxiliary moving reed 30 and the auxiliary static reed 40 is the same as the closed state of the moving contact part 1 and the static contact part 7.

[0049] The utility model further includes two arc extinguishing permanent magnets 10 which are respectively installed in accommodating grooves 322 correspondingly arranged on the outer sides of two surrounding walls 32 of the base and are covered by a magnetic isolation sheet 20 to isolate magnetism externally. Specifically, the magnetic isolation sheet 20 is generally U-shaped, the arc extinguishing permanent magnets 10 are embedded in the magnetic isolation sheet 20, and the two are installed in the accommodating grooves 322 of the surrounding walls 32 together. An arc isolation member 9 is installed on the static reed 7, and the arc isolation member 9 separates the arc generated when the moving contact 13 is disconnected from the static contact 72 from the static reed 7. When an arc is generated when the moving contact 13 is disconnected from the static contact 72, the arc moves downward under the magnetic field action of the arc extinguishing permanent magnets 10, so that the arc root moves down from between the contacts to between the terminals (i.e., between the static reed 71 and the moving reed 12). Since the arc isolation member 9 separates the arc from the static reed 71, even if the distance between the static reed 71 and the moving reed 12 is very small, a potential difference sufficient for the arc to continuously burn cannot be formed. Therefore, the arc will quickly extinguish between the static reed 71 and the moving reed 12, thus avoiding serious problems such as contact burnout and product failure caused by continuous arc burning.

[0050] A coil bobbin and iron core matching structure, a magnetic circuit part and an electromagnetic relay of the utility model, the parts not involved are the same as the prior art or can be implemented by using the prior art.

[0051] The above embodiments are only used to further illustrate a coil bobbin and iron core matching structure, a magnetic circuit part and an electromagnetic relay of the utility model, but the utility model is not limited to the embodiments. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model all fall within the protection scope of the technical solution of the utility model.

Claims

1. A cooperating structure of a bobbin and an iron core, comprising a bobbin and an iron core disposed in the bobbin, the bobbin having a winding portion for winding an enameled wire; characterized in that: The outer contour of the cross-section of the winding portion is non-circular, and the outer peripheral surface of the winding portion includes a convex arc surface; the number of the iron cores is multiple, the multiple iron cores are respectively rod-shaped, and the multiple iron cores are parallel to each other.

2. The coil bobbin and iron core matching structure according to claim 1, characterized in that: The outer contour of the cross-section of the winding portion is flat, and the outer peripheral surfaces on both sides of the winding portion in the length direction of the cross-section of the winding portion are respectively convex arc surfaces; the multiple iron cores are arranged along the length direction of the cross-section of the winding portion and are located on the center line of the cross-section of the winding portion in the length direction.

3. The coil bobbin and iron core matching structure according to claim 1, characterized in that: The side surfaces of adjacent iron cores are in contact with each other.

4. The coil bobbin and iron core matching structure according to any one of claims 1 to 3, characterized in that: The inner cavity of the bobbin includes a plurality of iron core cavities corresponding to the plurality of iron cores one by one, and the shapes and sizes of the cross-sections of the iron core cavities respectively match the shapes and sizes of the cross-sections of the iron cores; the multiple iron cores are respectively inserted into the corresponding iron core cavities.

5. The coil bobbin and iron core mating structure according to claim 4, characterized in that: The multiple iron core cavities are arranged along the length direction of the cross-section of the winding portion, and adjacent iron core cavities are laterally connected.

6. The coil bobbin and iron core matching structure according to any one of claims 1-3, characterized in that: The outer contour of the cross-section of the winding portion is oval, or the outer contour of the cross-section of the winding portion is racetrack-shaped.

7. The coil bobbin and iron core matching structure according to any one of claims 1-3, characterized in that: The cross-section of the iron core is circular, both ends of the iron core are respectively located outside the bobbin, and the diameters of the ends of both ends of the iron core are respectively smaller than the diameter of the portion of the iron core between its two ends.

8. A magnetic circuit part includes a yoke, characterized in that: It further includes the bobbin and iron core matching structure according to any one of claims 1-7, an enameled wire is wound around the winding portion of the bobbin, and the yoke is partially fitted at one end in the axial direction of the bobbin and is fixedly connected to the multiple iron cores.

9. The magnetic circuit portion according to claim 8, wherein: The yoke is L-shaped, and the number of the yokes is two. One side of each of the two yokes is respectively fitted at both ends of the bobbin in the axial direction. One end of each of the multiple iron cores is riveted and fixed to one side of one of the yokes, and the other end of each of the multiple iron cores is riveted and fixed to one side of the other yoke. The other sides of the two yokes are located on the same side of the bobbin and are oppositely arranged; it further includes an armature portion which is rotatably arranged, and the other sides of the two yokes are respectively fitted in the depressions on both sides of the armature portion.

10. An electromagnetic relay, characterized in that: It includes the magnetic circuit portion according to claim 8 or 9.

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