Coil portion and electromagnetic relay

Abstract

The utility model discloses a coil part and an electromagnetic relay, the coil part comprises a coil rack, the coil rack comprises two flange parts and a winding reel arranged between the two flange parts; the side wall of the winding reel is provided with at least one hollow window, the hollow window extends in the axial direction of the winding reel, and the length range of the hollow window covers the length range of a winding area of the winding reel. According to the utility model, the winding space can be increased on the basis that the overall volume of the coil part is not changed, so that the electromagnetic attraction of a product is improved, and the risk of breakdown short circuit of enameled wires is reduced.

Description

Technical Field

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

[0002] At present, with the miniaturization of relays, the space of the magnetic circuit system is limited, and the requirements for the space utilization inside the relay are increased. The relays in the prior art can be divided into the following two types according to the matching relationship between the coil frame and the iron core: one is that the coil frame wraps the entire iron core. When the space of the coil part is limited, the space of the coil winding is also limited, and there is a possibility that the requirements of the electromagnetic attraction of the product cannot be met. The second is that the coil frame and the iron core are integrally injection molded, and the plastic at the winding position of the coil frame is completely removed, so that the part of the iron core in the winding barrel of the coil frame is completely exposed and directly used for winding enameled wire. Although this increases the winding space, the enameled wire is in direct contact with the metal parts of the iron core. When the paint film of the enameled wire is damaged or the coil voltage is large, there may be a risk of breakdown and short circuit. Therefore, this structure is only suitable for specifications with relatively low insulation requirements. Utility Model Content

[0003] The utility model aims at the technical problems existing in the prior art and provides a coil part and an electromagnetic relay, which can not only increase the winding space but also reduce the risk of short circuit of the enameled wire.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a coil part, including a coil frame, the coil frame including two flange parts and a winding drum located between the two flange parts; the side wall of the winding drum is provided with at least one hollow window, the hollow window extends along the axial direction of the winding drum, and its length range covers the length range of the winding area of ​​the winding drum.

[0005] Furthermore, it also includes an iron core, which is at least partially located in the winding barrel of the coil frame, and the part of the iron core within the range of the hollow window is gap-fitted with the enameled wire wound around the winding barrel.

[0006] Furthermore, a portion of the iron core within the range of the hollow window is located within the hollow window and has a spacing from an outer edge of the hollow window.

[0007] Furthermore, the number of the hollow windows is an odd number, or the number of the hollow windows is an even number, and two are in a group, and the two hollow windows in the same group are arranged opposite to each other.

[0008] Furthermore, the cross-section of the portion of the iron core located in the winding drum is square and adapted to the cross-sectional shape of the winding drum, and the four corners of the outer contour of the cross-sectional area of ​​the winding drum are respectively set as R angles; the portion of the iron core located within the hollow window is a side surface of the portion of the iron core located in the winding drum, and the width of the side surface is consistent with the width of the hollow window.

[0009] Furthermore, the coil frame and the iron core are integrally injection molded together.

[0010] Furthermore, a convex portion and / or a concave portion is provided on the surface where the iron core is combined with the coil frame to increase the bonding force between the iron core and the coil frame.

[0011] Furthermore, the iron core includes a core rod and two contact parts located at both ends of the core rod, the core rod is located in the winding drum, the two contact parts are respectively fixed on the two flange parts, the contact part is provided with two pole shoe surfaces arranged back to back, and the arrangement direction of the two pole shoe surfaces is perpendicular to the axial direction of the winding drum; the core rod and / or the contact part are provided with the convex part and / or the concave part.

[0012] Furthermore, the winding reel is provided with at least one insert positioning groove.

[0013] Furthermore, the insert positioning groove is in the shape of an elongated strip and extends along the axial direction of the winding drum; the insert positioning groove is arranged in the center of the axial direction of the winding drum; the number of the insert positioning grooves is two, and the two insert positioning grooves are arranged opposite to each other.

[0014] Furthermore, the iron core is in a U-shape, and the two contact portions of the iron core correspond to the two side edges of the U-shape, and the core rod corresponds to the bottom edge of the U-shape.

[0015] The utility model further provides an electromagnetic relay, comprising the coil part as described in the utility model above.

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

[0017] 1. Since the winding drum of the utility model is provided with at least one hollow window, the hollow window extends along the axial direction of the winding drum, and its length range covers the length range of the winding area of ​​the winding drum, so that the utility model can use the hollow window to reduce the volume of the winding drum, so that the utility model can increase the winding space on the basis of the overall volume of the coil part unchanged, thereby improving the electromagnetic attraction of the product and reducing the risk of breakdown short circuit of the enameled wire.

[0018] 2. The utility model allows the portion of the iron core within the hollow window to be gap-fitted with the enameled wire, which can avoid direct contact between the enameled wire and the iron core and wear of the paint film, thereby further reducing the risk of breakdown and short circuit of the enameled wire.

[0019] 3. The number of hollow windows is preferably an even number, and two are in a group. The two hollow windows in the same group are arranged opposite to each other. On the one hand, it can further increase the winding space, and on the other hand, it can improve the injection molding processability of the coil frame and prevent defects such as air entrapment and unsatisfactory injection molding. In addition, the hollow window can be used as an insert positioning groove during the injection molding of the coil frame and the core insert, which can improve the insert positioning accuracy during integrated injection molding.

[0020] 4. The coil frame and the iron core are integrally injection molded together, and a convex portion and / or a concave portion are provided on the surface where the iron core and the coil frame are combined, which can increase the bonding force between the coil frame and the iron core.

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the coil part and the electromagnetic relay of the utility model are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the coil part of the utility model in the first embodiment Figure 1 (excluding enameled wire);

[0023] Figure 2 Schematic diagram of the three-dimensional structure of the coil part of the utility model in the first embodiment Figure 2 (excluding enameled wire);

[0024] Figure 3 It is a front view of the coil part of the utility model in the first embodiment (excluding the enameled wire);

[0025] Figure 4 Embodiment 1 Figure 3 AA section view;

[0026] Figure 5 It is a three-dimensional structural schematic diagram of the coil part of the utility model in the first embodiment;

[0027] Figure 6 It is a three-dimensional structural schematic diagram of an iron core of the utility model in the first embodiment;

[0028] Figure 7 It is a three-dimensional structural schematic diagram of another iron core of the utility model in the first embodiment;

[0029] Figure 8 This is a front view of the coil portion of the utility model in the second embodiment (excluding the enameled wire);

[0030] Fig. 9Embodiment 2 Figure 8 BB cross-sectional view;

[0031] Fig.10 1 is an exploded schematic diagram of an electromagnetic relay according to the third embodiment of the present utility model;

[0032] Fig.11 is a top view of the electromagnetic relay of the utility model in the third embodiment;

[0033] Fig.12 Embodiment 3 Fig.11 CC section view;

[0034] In the figure, 1, coil frame, 11, flange part, 12, winding drum, 121, hollow window, 122, insert positioning groove, 2, iron core, 21, contact part, 211, sinking platform, 212, pole shoe surface, 22, core rod, 221, convex bud, 222, countersunk hole, 3, enameled wire, 4, base, 5, armature part, 6, contact part, 7, push card, 8, shell, 9, cover plate. DETAILED DESCRIPTION

[0035] In the present invention, the directions or positional relationships indicated by "upper", "lower", "front", "back", "inside", "outside", etc. in the description are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In addition, in the description of the present invention, unless otherwise specified, "multiple" means two or more, and "at least one" means one or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0037] Embodiment 1

[0038] See also Figure 1-Figure 7As shown, a coil part of the utility model comprises a coil frame 1 and an iron core 2. The iron core 2 is arranged on the coil frame 1. The coil frame 1 comprises two flange portions 11 and a winding drum 12 located between the two flange portions 11. The winding drum 12 is wound with an enameled wire 3. The iron core 2 is at least partially located in the winding drum 12. Specifically, the iron core 2 comprises two contact portions 21 and a core rod 22 located between the two contact portions 21. The core rod 22 is located in the winding drum 12. The side wall of the winding drum 12 is provided with at least one hollow window 121. The hollow window 121 extends along the axial direction of the winding drum 12, and its length range covers the length range of the winding area of ​​the winding drum 12. Therefore, the utility model can utilize the hollow window to reduce the volume of the winding drum, so that the utility model can increase the winding space on the basis of keeping the overall volume of the coil part unchanged, thereby improving the electromagnetic attraction of the product and making the enameled wire have less contact with the iron core 2, or even no contact, thereby reducing the risk of breakdown short circuit when the enameled wire paint film is damaged or the coil voltage is high and in contact with the iron core.

[0039] Furthermore, the portion of the iron core 2 within the hollow window 121 is in clearance fit with the enameled wire 3 wound on the bobbin 12. Specifically, the portion of the core rod 22 of the iron core 2 within the hollow window 121 is located within the hollow window 121, and has a spacing L between it and the outer edge of the hollow window 121, so that the portion of the iron core 2 within the hollow window 121 is in clearance fit with the enameled wire 3 wound on the bobbin 12, thereby further avoiding the possibility of contact between the iron core 2 and the enameled wire, and further reducing the risk of breakdown short circuit of the enameled wire.

[0040] In this embodiment, the cross section of the core rod 22 is square, but not limited thereto. The cross section of the bobbin 12 is adapted to the cross section of the core rod 22, and the four corners of the cross section outer contour of the bobbin 12 are respectively provided with R angles, which is conducive to reducing the risk of wire breakage when the enameled wire is wound. The portion of the core rod 22 located within the hollow window 121 is a side surface of the core rod 22, and the width of the side surface of the core rod 22 is consistent with the width of the hollow window 121.

[0041] As a preferred structure, the number of hollow windows 121 is multiple, specifically an even number, and two are in a group, and the two hollow windows 121 in the same group are arranged opposite to each other. In this way, on the one hand, the winding space can be further increased, and on the other hand, the injection molding processability of the coil frame 1 can be improved to prevent the defect of insufficient injection molding caused by trapped air. Specifically, in this embodiment, the number of hollow windows 121 is two. Figure 1In the perspective, the two hollow windows 121 are arranged opposite to each other up and down, but it is not limited thereto. In other embodiments, the two hollow windows 121 are arranged opposite to each other front and back. In other embodiments, if the cross section of the core is a polygon (more than four sides, such as a pentagon, a hexagon, etc.) or a circle, the number of the hollow windows can be more than two, and can be an odd number.

[0042] In this embodiment, the coil frame 1 and the iron core 2 are integrally injection molded together, and the iron core 2 is roughly U-shaped, and the two contact portions 21 of the iron core 2 correspond to the two sides of the U-shape, and the core rod 22 corresponds to the bottom of the U-shape. In other embodiments, the iron core is H-shaped or straight-shaped, and when the iron core is straight-shaped, the iron core can be directly inserted into the winding drum of the coil frame, or it can be integrally injection molded with the coil frame. The two contact portions 21 of the iron core 2 are respectively fixed on the two flange portions 11, and each contact portion 21 is respectively provided with two pole shoe surfaces 212 arranged back to back, and the arrangement directions of the two pole shoe surfaces 212 are respectively perpendicular to the axial direction of the winding drum 12. The two pole shoe surfaces 212 are respectively exposed outside the corresponding flange portions 11.

[0043] In order to increase the bonding force between the coil frame 1 and the iron core 2, the utility model provides a convex portion and / or a concave portion on the surface where the iron core 2 is bonded to the coil frame 1. Specifically, the surface where the core rod 22 of the iron core 2 is bonded to the winding drum 12 is provided with a convex portion and / or a concave portion: Figure 6 As shown, in this embodiment, the core rod 22 is provided with both a convex portion and a concave portion, and the convex portion is a circular convex bud 221, and the concave portion is a countersunk hole 222. The convex bud 221 and the countersunk hole 222 are located on the same side of the core rod 22, specifically on the front side of the core rod 22, but not limited thereto, and the convex bud 221 and the countersunk hole 222 are located at both ends of the core rod 22. In other embodiments, the surfaces where the two contact portions 21 of the iron core 2 are combined with the flange portion 11 are respectively provided with convex portions and / or concave portions to increase the bonding force between the contact portion 21 of the iron core 2 and the flange portion 11. Specifically, as shown in FIG. Figure 7 As shown, the bottom surfaces of the two contact portions 21 of the iron core 2 are respectively provided with recessed portions, which are specifically sinks 211 , but are not limited thereto.

[0044] In this embodiment, the winding drum 12 is provided with at least one insert positioning groove 122, and the insert positioning groove 122 and the hollow window 121 are located on different sides of the winding drum 12. The insert positioning groove 122 is in the shape of an elongated strip and extends along the axial direction of the winding drum 12, and the insert positioning groove 122 is arranged in the center of the axial direction of the winding drum 12. There are two insert positioning grooves 122, and the two insert positioning grooves 122 are arranged opposite to each other. Specifically, Figure 1From the perspective, the two insert positioning grooves 122 are located at the front and rear sides of the winding drum 12. The insert positioning grooves 122 can not only position the core 2 during the injection molding process of the coil frame 1 and the core 2, but also have an exhaust effect. In other embodiments, the utility model directly uses the hollow window as the insert positioning groove.

[0045] The hollow window 121 of a coil part of the utility model can reduce the volume of the winding drum 12, thereby increasing the winding space on the basis of the unchanged overall volume of the coil part, so as to improve the electromagnetic attraction of the product. In addition, the winding drum 12 of the utility model retains the plastic part instead of being hollowed out as a whole, so that the enameled wire 3 has less contact with the iron core 2 or even no contact. In particular, the utility model makes the iron core 2 and the enameled wire 3 have a gap fit, which can completely avoid the contact between the enameled wire and the iron core 2, so that there is no risk of breakdown short circuit when the enameled wire film is damaged or the coil voltage is large.

[0046] Embodiment 2

[0047] See also Figure 8 , Fig. 9 As shown, a coil part of the utility model is different from the above-mentioned embodiment 1 in that: the number of the hollow windows is four, and they are arranged opposite to each other in pairs. Figure 8 From the perspective, two of the hollow windows are arranged opposite to each other up and down, and the other two hollow windows are arranged opposite to each other front and back. Therefore, the core rod 22 of the core is only covered with plastic at four hanging corners, such as Fig. 9 In this embodiment, the utility model can directly use the hollow window as the insert positioning groove.

[0048] Embodiment 3

[0049] See also Figure 10-12 As shown, an electromagnetic relay of the utility model includes a coil part of the utility model, specifically including a coil part of the utility model described in the above embodiment one, but is not limited to this. In other embodiments, the electromagnetic relay of the utility model includes a coil part of the utility model described in the above embodiment two or other embodiments.

[0050] In this embodiment, the utility model further comprises a base 4, a shell 8, four push cards 7, four groups of contact parts 6, an armature part 5, and a cover plate 9. The above-mentioned coil part is installed into the base 4 from bottom to top, the armature part 5 is rotatably connected to the base 4, and the two ends of the armature part 5 respectively form two clapping parts arranged along its width direction, and the opposite inner sides of the two clapping parts are pole shoe surfaces, respectively. Each contact part 21 of the iron core 2 is respectively matched between the two clapping parts at the same end of the armature part 5, and each clapping part is respectively matched with the movable spring part of each group of contacts of the contact part 6 through the push card 7. The shell 8 is connected to the base 4, and contains the armature part 5, the push card 7, and the contact part 6 in its shell cavity, and the cover plate 9 is connected to the bottom end of the base 4 to cover the coil part.

[0051] The utility model provides a coil part and an electromagnetic relay, and the unrelated parts are the same as those in the prior art or can be implemented by using the prior art.

[0052] The above embodiments are only used to further illustrate a coil part and an electromagnetic relay of the utility model, but the utility model is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model fall within the protection scope of the technical solution of the utility model.

Claims

1. A coil part, comprising a coil frame, the coil frame comprising two flange portions and a bobbin located between the two flange portions; characterized in that: The side wall of the winding drum is provided with at least one hollow window, which extends along the axial direction of the winding drum, and the length range of the hollow window covers the length range of the winding area of ​​the winding drum.

2. The coil portion according to claim 1, characterized in that: It also includes an iron core, which is at least partially located in the winding barrel of the coil frame, and the part of the iron core within the range of the hollow window is gap-fitted with the enameled wire wound around the winding barrel.

3. The coil portion according to claim 2, characterized in that: The portion of the iron core within the range of the hollow window is located in the hollow window and has a distance from the outer edge of the hollow window.

4. The coil portion according to claim 1, characterized in that: The number of the hollow windows is an odd number, or the number of the hollow windows is an even number, and two of them form a group, and the two hollow windows in the same group are arranged opposite to each other.

5. The coil part according to any one of claims 2 to 3, characterized in that: The cross-section of the portion of the iron core located in the winding drum is square and matched with the cross-sectional shape of the winding drum, and the four corners of the outer contour of the cross-sectional area of ​​the winding drum are respectively set as R angles; the portion of the iron core located within the hollow window is a side surface of the portion of the iron core located in the winding drum, and the width of the side surface is consistent with the width of the hollow window.

6. The coil part according to any one of claims 2 to 3, characterized in that: The coil frame and the iron core are integrally injection molded together.

7. The coil portion according to claim 6, characterized in that: A convex portion and / or a concave portion is provided on the surface where the iron core is combined with the coil frame to increase the combining force between the iron core and the coil frame.

8. The coil portion according to claim 7, characterized in that: The iron core includes a core rod and two contact parts located at both ends of the core rod, the core rod is located in the winding drum, the two contact parts are respectively fixed on the two flange parts, the contact part is provided with two pole shoe surfaces arranged back to back, and the arrangement direction of the two pole shoe surfaces is perpendicular to the axial direction of the winding drum; the core rod and / or the contact part are provided with the convex part and / or the concave part.

9. The coil portion according to claim 6, characterized in that: The winding drum is provided with at least one insert positioning groove.

10. The coil portion according to claim 9, characterized in that: The insert positioning groove is in the shape of an elongated strip and extends along the axial direction of the winding drum; the insert positioning groove is arranged in the center of the axial direction of the winding drum; the number of the insert positioning grooves is two, and the two insert positioning grooves are arranged opposite to each other.

11. An electromagnetic relay, characterized in that: The invention comprises the coil part according to any one of claims 1 to 10.

Images