Coil rack, coil assembly and relay
By designing a coil frame with a specific structure, including the winding shaft, outer retaining wall, and wire passage groove of the middle retaining wall, the problem of enameled wire breakage during injection molding was solved, realizing the miniaturization and strength improvement of the relay.
Patent Information
- Application Number
- CN202423166881.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In the existing technology, the enameled wire of the ultra-miniature seesaw electromagnetic relay is easily squeezed and pulled during the injection molding process, which can lead to breakage. In addition, the coil assembly occupies most of the space of the base, making it difficult to achieve miniaturization.
Design a coil frame including a winding shaft, an outer retaining wall and a middle retaining wall. The middle retaining wall has an outward-facing wire-passing groove. The wire-passing groove is located at a specific angle and position. Combined with the inclined bottom surface of the groove and the protrusion, it disperses the scouring force, restricts the movement of the enameled wire, and improves the strength of the middle retaining wall.
It effectively prevents the enameled wire from breaking, improves the strength of the middle retaining wall and the uniformity of plastic distribution, and promotes product miniaturization and simplified mold design.
Smart Images
Figure CN223757458U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to relay field, concretely relates to a coil holder, coil assembly and relay. BACKGROUND
[0002] The super mini seesaw type electromagnetic relay includes a fixed part and a movable part, the fixed part includes a base and a coil assembly, the coil assembly includes a coil holder and an enameled wire wound on the coil holder, the base and the coil assembly are mainly integrated by one-piece combined injection molding process, using the process can improve the insulation performance of the product, reduce the size of the product and improve the anti-vibration performance. However, during injection molding, the liquid plastic will flush the enameled wire in the combined injection molding process. In order to ensure the density of the plastic of the molded part, the flushing force of the liquid plastic is usually very large. During the injection molding process, the flushing force will cause the enameled wire to be squeezed and pulled, and in severe cases, the enameled wire will break. In order to reduce the impact on the enameled wire, the injection gate with the largest flushing force is usually arranged away from the enameled wire on the coil assembly. Generally, the enameled wire of the coil assembly occupies most of the space of the base. During mold design, the injection gate can only be arranged at the edge position. In order to push the liquid plastic to each position of the base part and ensure the density of the injection molding, a larger injection pressure is required. For the coil assembly, although the direct flushing of the injection gate is avoided, the lateral squeezing and flushing force on the enameled wire of the coil assembly is increased, and the lateral squeezing and pulling force is still relatively large. SUMMARY
[0003] The utility model discloses a coil holder, coil assembly and relay which can avoid the problem of enameled wire breakage caused by excessive pulling during injection molding and has higher strength of the middle barrier wall of the coil holder.
[0004] To achieve the above-mentioned purpose, the utility model and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:
[0005] The first technical scheme and its related embodiments provide a coil holder for injection molding with a base of a relay, which includes a winding shaft, two outer barrier walls and a middle barrier wall. The two outer barrier walls are located at both ends of the winding shaft, and the middle barrier wall is located in the middle of the winding shaft. The middle barrier wall is provided with two outwardly open wire passing grooves, and the two wire passing grooves are located in the first interval and the second interval respectively. The first interval and the second interval are located in the two diagonal regions of the first plane and the second plane which are perpendicular to each other. The intersection line of the first plane and the second plane passes through the axis of the winding shaft.
[0006] Based on technical solution one, technical solution two is also provided, in technical solution two and its related embodiments, the two included angles of the first plane and the third plane where the first interval and the second interval are located are acute angles, and the intersection lines of the first plane and the third plane pass through the axis of the winding shaft.
[0007] Based on technical solution two, technical solution three is also provided, in technical solution three and its related embodiments, the two wire passing grooves are respectively opened on the two sides of the middle barrier wall away from each other.
[0008] Based on technical solution one, technical solution four is also provided, in technical solution four and its related embodiments, the groove bottom surface of the wire passing groove is an inclined surface inclined relative to the axis of the winding shaft.
[0009] Based on any one of technical solutions one to four, technical solution five is also provided, in technical solution five and its related embodiments, the middle barrier wall is provided with two protruding portions respectively close to the two wire passing grooves, and the two protruding portions are respectively protruded relative to the two groove openings of the two wire passing grooves.
[0010] Based on technical solution five, technical solution six is also provided, in technical solution six and its related embodiments, the two protruding portions are respectively connected with the two groove side walls closest to the two wire passing grooves.
[0011] Based on technical solution six, technical solution seven is also provided, in technical solution seven and its related embodiments, in the projection plane perpendicular to the axis of the winding shaft, the protruding portions are covered by the outer barrier wall.
[0012] Based on technical solution seven, technical solution eight is also provided, in technical solution eight and its related embodiments, one end of the protruding portion away from the wire passing groove is formed with a rounded corner.
[0013] Technical solution nine and its related embodiments provide a coil assembly for injection molding with a base of a relay, characterized in that the coil assembly comprises a coil holder, a U-shaped core and an enameled wire, the coil holder is as described in any one of technical solutions one to eight, a winding window is formed between each outer barrier wall and the middle barrier wall, the U-shaped core penetrates through the winding shaft and the two ends of the U-shaped core are respectively extended from the two outer barrier walls in a direction perpendicular to the axis of the winding shaft, and the enameled wire is wound on the winding window.
[0014] Technical solution ten and its related embodiments provide a relay comprising the coil assembly of technical solution nine and a base, and the coil assembly is injection molded with the base.
[0015] From the above description of the utility model and its preferred embodiments, compared with the prior art, the technical solutions and preferred embodiments of the utility model have the following beneficial effects due to the following technical means:
[0016] In the technical solution one and the preferred embodiments thereof, the middle barrier wall transfers the washing force to the coil holder which is positioned, plays a role of force unloading, and limits the movement of the enameled wire to avoid the problem of broken wire caused by excessive pulling of the enameled wire. The middle barrier wall is provided with two outwardly open wire passing grooves. The structure of the wire passing grooves can ensure that the enameled wire can not be prevented from being wound on the other side of the middle barrier wall during the winding process of the coil assembly. The two wire passing grooves are respectively located in the first interval and the second interval. The first interval and the second interval are respectively located in two diagonal regions of the first plane and the second plane which are perpendicular to each other. The intersection lines of the first plane and the second plane pass through the axis of the winding shaft. The two wire passing grooves are located on different sides of the middle barrier wall. The plastic forming space between the two wire passing grooves is large, which can make the plastic of the middle barrier wall be uniformly distributed, reduce the difficulty of mold design, ensure the strength of the middle barrier wall, be conducive to reducing the thickness of the middle barrier wall, reducing the occupancy rate of the winding space, and being conducive to product miniaturization. If the two wire passing grooves are located on the same side of the middle barrier wall, the plastic forming space between the two wire passing grooves will be small due to the close positions of the two wire passing grooves, which is not conducive to ensuring the strength and forming difficulty of the plastic. In order to make up for this problem in the prior art, the thickness of the barrier wall can only be increased to ensure the strength, which is not conducive to product miniaturization.
[0017] In the technical solution two and the preferred embodiments thereof, the first interval and the second interval are respectively located in two diagonal regions of the first plane and the third plane which are perpendicular to each other and form an acute angle. The intersection lines of the first plane and the third plane pass through the axis of the winding shaft. The two wire passing grooves are further away from each other, so that the plastic of the middle barrier wall is further uniformly distributed, and the strength of the middle barrier wall is further improved under the condition that the thickness of the middle barrier wall is small.
[0018] In the technical solution three and the preferred embodiments thereof, the two wire passing grooves are respectively opened on the two sides of the middle barrier wall which are away from each other. The two wire passing grooves are further away from each other, so that the plastic of the middle barrier wall is further uniformly distributed, and the strength of the middle barrier wall is further improved under the condition that the thickness of the middle barrier wall is small.
[0019] In the technical solution four and the preferred embodiments thereof, the groove bottom surface of the wire passing groove is an inclined surface which is inclined relative to the axis of the winding shaft. The design of the inclined surface makes the enameled wire fit on the inclined surface when the enameled wire is wound on the other side of the middle barrier wall. The enameled wire can be protected from being washed by the liquid plastic when the base part is injection molded.
[0020] In the technical solution five and the preferred embodiments thereof, the middle barrier wall is provided with two protruding parts near the two wire passing grooves respectively. The two protruding parts are respectively protruded relative to the groove openings of the two wire passing grooves, so that the protruding parts form notches above the groove openings of the wire passing grooves, which is conducive to dispersing the lateral washing force of the liquid plastic on the enameled wire in the wire passing grooves.
[0021] In the sixth aspect and the preferred embodiments thereof, the two convex parts are connected with the two slot side walls closest to the two convex parts, respectively, which is more conducive to production and processing.
[0022] In the seventh aspect and the preferred embodiments thereof, in the projection plane perpendicular to the axis of the bobbin, the convex part is covered by the outer baffle wall, which is more conducive to the miniaturization of the coil holder and avoids interference with the movable part in the relay.
[0023] In the eighth aspect and the preferred embodiments thereof, the end of the convex part away from the wire slot is formed with a rounded corner, which is more conducive to the flow of liquid plastic, so that the resistance of the liquid plastic is not too large, and the occupied space of the convex part is reduced.
[0024] The ninth aspect has the technical advantages of any one of the first to eighth aspects.
[0025] The tenth aspect has the technical advantages of the ninth aspect. BRIEF DESCRIPTION OF DRAWINGS
[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiment description are briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.
[0027] Figure 1 Part of the schematic diagram of the relay of the embodiment of the present application;
[0028] Figure 2 The schematic diagram of the coil assembly and the base injection molded as one body of the embodiment of the present application;
[0029] Figure 3 The cross-sectional view of the coil assembly of the embodiment of the present application;
[0030] Figure 4 The three-dimensional schematic diagram of the coil holder and the U-shaped core of the embodiment of the present application;
[0031] Figure 5 The side view of Figure 4 ; Figure 1 ;
[0032] Figure 6 The cross-sectional view of Figure 5 in the A-A direction;
[0033] Figure 7 The side view of Figure 4 ; Figure 2 ;
[0034] Figure 8 The cross-sectional view of Figure 7 in the B-B direction.
[0035] Main reference sign explanation:
[0036] Base 10; coil stand 20; winding shaft 21; outer retaining wall 22; middle retaining wall 23; wire passing groove 24; inclined surface 241; protruding part 25; winding window 01; first plane 001; second plane 002; third plane 003; U-shaped iron core 30; enameled wire 40. DETAILED DESCRIPTION
[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as excluding other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0038] In the claims, description and above drawings of the present application, unless otherwise explicitly limited, the terms such as "first", "second" or "third" are used only to distinguish different objects, and are not used to describe a specific order.
[0039] In the claims, description and above drawings of the present application, unless otherwise explicitly limited, for the terms of orientation, such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation and position relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present application.
[0040] In the claims, description and above drawings of the present application, unless otherwise explicitly limited, such as the terms "fixedly connected" or "fixedly connected", should be understood broadly, that is, any connection mode without displacement relationship and relative rotation relationship between the two, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.
[0041] In the claims, description and above drawings of the present application, the terms "include", "have" and their variants are intended to mean "include but not limited to".
[0042] Reference Figure 1 , Figure 1A relay is shown, comprising a coil assembly and a base 10, see Figure 2 The coil assembly is injection molded with the base 10.
[0043] See Figure 3 The coil assembly comprises a coil frame 20, a U-shaped core 30 and an enameled wire 40, the coil frame 20 comprises a bobbin 21, two outer retaining walls 22 and a middle retaining wall 23, the two outer retaining walls 22 are respectively located at both ends of the bobbin 21, and the middle retaining wall 23 is located at the middle of the bobbin 21, and a winding window 01 is formed between each outer retaining wall 22 and the middle retaining wall 23. See Figure 4 The middle retaining wall 23 is provided with two outwardly open wire passing grooves 24, see Figures 5-6 The two wire passing grooves 24 are respectively located in the first interval and the second interval, and the first interval and the second interval are respectively located in the two diagonal regions of the first plane 001 and the second plane 002 which are perpendicular to each other, and the intersection lines of the first plane 001 and the second plane 002 all pass through the axis of the bobbin 21, in the embodiment, the first interval and the second interval are respectively located in the two diagonal regions of the first plane 001 and the third plane 003 which intersect with each other and the included angle is acute, and the intersection lines of the first plane 001 and the third plane 003 all pass through the axis of the bobbin 21, in the preferred embodiment, the two wire passing grooves 24 are respectively opened on the two sides of the middle retaining wall 23 which are away from each other, see Figures 7-8 The groove bottom surface of the wire passing groove 24 is an inclined surface 241 which is inclined with respect to the axis of the bobbin 21, still see Figure 6 The middle retaining wall 23 is provided with two protruding portions 25 which are respectively close to the two wire passing grooves 24, the two protruding portions 25 are respectively protruded with respect to the two groove openings of the two wire passing grooves 24 and are respectively connected with the two groove side walls which are closest to the two wire passing grooves 24, wherein, in the projection plane which is perpendicular to the axis of the bobbin 21, the protruding portion 25 is covered by the outer retaining wall 22, in the embodiment, the end of the protruding portion 25 which is away from the wire passing groove 24 forms a rounded corner.
[0044] See Figure 3 The U-shaped core 30 penetrates through the bobbin 21 and its two ends respectively extend from the two outer retaining walls 22 in the direction which is perpendicular to the axis of the bobbin 21 and form magnetic pole portions, and the enameled wire 40 is wound on the winding window 01.
[0045] See Figure 2 The base 10 is in the shape of a cuboid as a whole, its length direction is the X-axis direction, its width direction is the Y-axis direction, and its height direction is the Z-axis direction, the base 10 is injection molded with the coil assembly and the two ends of the U-shaped core are respectively located at the two ends of the base 10 in the X-axis direction.
[0046] In this embodiment, the middle retaining wall 23 transfers the scouring force to the coil holder 20 that is positioned, plays a role of force unloading, and can limit the movement of the enameled wire 40 to avoid the problem of broken wire caused by excessive pulling of the enameled wire 40. The middle retaining wall 23 is provided with two outwardly open wire passing grooves 24. The structure of the wire passing grooves 24 can ensure that the enameled wire 40 can not be prevented from being wound on the other side of the middle retaining wall 23 during the winding process of the coil assembly due to the setting of the middle retaining wall 23. The two wire passing grooves 24 are located in the first interval and the second interval respectively. The first interval and the second interval are located in the two diagonal regions of the first plane 001 and the second plane 002 that are perpendicular to each other. The intersection lines of the first plane 001 and the second plane 002 pass through the axis of the winding shaft 21, so that the two wire passing grooves 24 are located on different sides of the middle retaining wall 23. The plastic forming space between the two wire passing grooves 24 is large, which can make the plastic of the middle retaining wall 23 be uniformly distributed, reduce the difficulty of mold design, ensure the strength of the middle retaining wall 23, and be beneficial to reducing the thickness of the middle retaining wall 23, reducing the occupancy rate of the winding space, and being beneficial to product miniaturization. If the two wire passing grooves 24 are located on the same side of the middle retaining wall 23, due to the close position of the two wire passing grooves 24, the plastic forming space between the two wire passing grooves 24 is small, which is not conducive to ensuring the strength and forming difficulty of the plastic. In order to make up for this problem, the strength can only be ensured by increasing the thickness of the retaining wall, which is not conducive to product miniaturization.
[0047] In this embodiment, the first interval and the second interval are located in the two diagonal regions of the first plane 001 and the third plane 003 that are perpendicular to each other and form acute angles. The intersection lines of the first plane 001 and the third plane 003 pass through the axis of the winding shaft 21, further making the two wire passing grooves 24 away from each other, and further making the plastic of the middle retaining wall 23 be uniformly distributed, and further improving the strength of the middle retaining wall 23 under the condition that the thickness of the middle retaining wall 23 is small.
[0048] In this embodiment, the two wire passing grooves 24 are respectively opened on the two sides of the middle retaining wall 23 that are away from each other, further making the two wire passing grooves 24 away from each other, and further making the plastic of the middle retaining wall 23 be uniformly distributed, and further improving the strength of the middle retaining wall 23 under the condition that the thickness of the middle retaining wall 23 is small.
[0049] In this embodiment, the groove bottom surface of the wire passing groove 24 is an inclined surface 241 that is inclined relative to the axis of the winding shaft 21. The design of the inclined surface 241 makes the enameled wire 40 that crosses the two sides of the middle retaining wall 23 during winding can be attached to the inclined surface 241, and can protect the section of the enameled wire 40 from being washed by the liquid plastic during partial injection molding of the base 10.
[0050] In the embodiment, the middle barrier wall 23 is provided with two protruding portions 25 close to the two wire-through grooves 24, the two protruding portions 25 are respectively protruded relative to the two groove openings of the two wire-through grooves 24 and are respectively connected with two groove side walls of the two wire-through grooves 24 closest to the two groove side walls, so that the protruding portions 25 form gaps above the groove openings of the wire-through grooves 24, which is beneficial to disperse the lateral washing force of the liquid plastic on the enameled wires 40 in the wire-through grooves 24, and is more beneficial to production and processing.
[0051] In the embodiment, the protruding portions 25 are covered by the outer barrier wall 22 in the projection plane perpendicular to the axis of the winding shaft 21, which is more beneficial to miniaturization of the coil holder 20 and avoids interference with movable parts in the relay.
[0052] In the embodiment, the end of the protruding portion 25 away from the wire-through groove 24 is formed with a rounded corner, which is more beneficial to flow of the liquid plastic, so that the resistance of the liquid plastic is not too large, and the occupied space of the protruding portion 25 is reduced.
[0053] The above description and embodiment are used to explain the protection scope of the utility model, but do not constitute the limitation of the protection scope of the utility model. Through the inspiration of the utility model or the above embodiment, the modification, equivalent replacement or other improvement of the utility model embodiment or one part of the technical features obtained by the ordinary skilled person in the art combining with the common knowledge, the ordinary technical knowledge and / or the prior art through logical analysis, reasoning or limited test should be included in the protection scope of the utility model.
Claims
1. A coil former (20) for injection molding with a base of a relay, comprising a bobbin (21), two outer retaining walls (22) respectively located at both ends of the bobbin (21), and a middle retaining wall (23) located at the middle of the bobbin (21), characterized in that, The middle retaining wall (23) is provided with two outwardly open wire passing grooves (24), and the two wire passing grooves (24) are respectively located in the first interval and the second interval, and the first interval and the second interval are respectively located in two diagonal regions of the first plane (001) and the second plane (002) which are perpendicular to each other, and the intersection line of the first plane (001) and the second plane (002) passes through the axis of the bobbin (21).
2. A coil former (20) as claimed in claim 1, characterised in that The first interval and the second interval are respectively located in two diagonal regions of the first plane (001) and the third plane (003) which are intersected with each other, and the intersection angle of the first plane (001) and the third plane (003) is acute, and the intersection line of the first plane (001) and the third plane (003) passes through the axis of the bobbin (21).
3. A coil former (20) as claimed in claim 2, characterised in that The two wire passing grooves (24) are respectively open on two sides of the middle retaining wall (23) which are away from each other.
4. A coil former (20) as claimed in claim 1, characterised in that The groove bottom surface of the wire passing groove (24) is an inclined surface (241) which is inclined relative to the axis of the bobbin (21).
5. A coil former (20) as claimed in any one of claims 1-4, characterized in that The middle retaining wall (23) is provided with two protruding portions (25) which are respectively close to the two wire passing grooves (24).
6. A coil former (20) as claimed in claim 5, characterised in that The two protruding portions (25) are respectively connected with two groove side walls which are closest to the two wire passing grooves (24).
7. A coil former (20) as claimed in claim 6, characterised in that the coil former (20) is formed from a single piece of material. The protruding portion (25) is covered by the outer retaining wall (22) on the projection plane which is perpendicular to the axis of the bobbin (21).
8. A coil former (20) as claimed in claim 7, characterised in that The end of the protruding portion (25) which is away from the wire passing groove (24) is formed with a rounded corner.
9. A coil assembly for injection molding with a base (10) of a relay, characterized in that, The coil assembly comprises a U-shaped iron core (30), an enameled wire (40) and the coil holder (20) as claimed in any one of claims 1-8, and a winding window (01) is formed between each outer retaining wall (22) and the middle retaining wall (23), the U-shaped iron core (30) penetrates through the bobbin (21) and the two ends of the U-shaped iron core (30) respectively extend out from the two outer retaining walls (22) in the direction which is perpendicular to the axis of the bobbin (21), and the enameled wire (40) is wound on the winding window (01).
10. A relay characterized by comprising: The coil assembly and the base (10) are injection molded.