An electromagnetic relay capable of realizing accurate positioning of a coil portion

Abstract

The application discloses an electromagnetic relay capable of realizing accurate positioning of a coil part, which comprises a coil part and a base, and the iron core of the coil part is provided with two contact parts located outside the two ends of a coil frame, the two side faces of the contact parts in a first direction are respectively pole shoe faces; the base is provided with a containing cavity, the coil part is arranged into the containing cavity along one side of a second direction, the containing cavity is respectively provided with a limiting groove matched with the contact parts at the positions corresponding to the contact parts; the first direction and the second direction are perpendicular to each other and are respectively perpendicular to the axial direction of the coil frame; at least one pole shoe face of the contact part is matched with the groove wall of the limiting groove in the first direction and is provided with a first positioning structure, and the contact part is matched with the limiting groove in the axial direction of the coil frame and is provided with a second positioning structure. The application can realize accurate positioning of the coil part in multiple directions, greatly improves the positioning precision of the coil part, and greatly improves the consistency of parameters in the product assembling and using processes.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to an electromagnetic relay capable of achieving precise positioning of the coil portion. Background Technology

[0002] When a relay operates and releases, especially a relay with a magnet, the combined force of the magnet results in a significant force when the magnetic circuit closes. Furthermore, the relay coil needs to withstand tens of millions of impacts, thus placing high demands on the stability of the coil. Poor assembly and positioning accuracy of the coil, and insufficient stability, will lead to inconsistent product performance, lower assembly pass rates, and increased production costs. Moreover, significant changes in relay parameters during use will reduce reliability and negatively impact customer experience.

[0003] Currently, existing relays typically position the coil in the following ways: positioning protrusions are set on the iron core and clamped to the positioning groove of the base, or a local area is clamped by parallel grooves. However, this is unidirectional positioning and cannot accurately position the coil in multiple directions at the same time. This results in insufficient positioning accuracy of the coil, which in turn leads to poor consistency of product parameters. After multiple engagement and disengagement actions of the relay's magnetic circuit system, the product parameters change significantly. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing an electromagnetic relay capable of precise positioning of the coil portion. Through structural improvements, it enables multi-directional positioning of the coil portion, significantly improving the positioning accuracy of the coil portion.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an electromagnetic relay capable of precise positioning of the coil portion, comprising a coil portion and a base, the coil portion comprising a coil frame and an iron core fixed together, the iron core having two contact portions located outside both ends of the coil frame, the two sides of the contact portions facing away from each other in a first direction being pole shoe surfaces; the base is provided with a receiving cavity, the coil portion being inserted into the receiving cavity along one side in a second direction, the receiving cavity having limiting grooves corresponding to each contact portion respectively, which cooperate with the contact portions; the first direction and the second direction are perpendicular to each other and are respectively perpendicular to the axial direction of the coil frame; at least one pole shoe surface of the contact portion cooperates with the groove wall of the limiting groove in the first direction with a first positioning structure, and the contact portion and the limiting groove cooperate with a second positioning structure in the axial direction of the coil frame.

[0006] Furthermore, the contact portion and the limiting groove are fitted with a third positioning structure in at least one of the first direction, the second direction, and the axial direction of the coil frame.

[0007] Furthermore, the first positioning structure includes at least one first positioning protrusion, which is disposed in one of the groove wall of the limiting groove in the first direction and the pole shoe surface of the contact portion, and abuts against the other of the magnetic shielding sheets disposed on the groove wall of the limiting groove in the first direction and the pole shoe surface of the contact portion or on the pole shoe surface.

[0008] Furthermore, the first positioning protrusion is rib-shaped and extends along the second direction; the first positioning protrusion is disposed on the groove wall of the limiting groove in the first direction, and the protrusion of the first positioning protrusion relative to the groove wall gradually increases along the insertion direction of the coil portion.

[0009] Furthermore, the second positioning structure includes at least one second positioning protrusion, which is disposed on one of the groove wall of the limiting groove in the axial direction of the coil frame and the side of the contact portion in the axial direction of the coil frame, and abuts against the other of the groove wall of the limiting groove in the axial direction of the coil frame and the side of the contact portion in the axial direction of the coil frame.

[0010] Furthermore, the second positioning protrusion is rib-shaped and extends along the second direction; the second positioning protrusion is provided on the groove wall of the limiting groove in the axial direction of the coil frame, and abuts against the corresponding pole shoe surface or the isolation piece provided on the corresponding pole shoe surface, and the protrusion of the second positioning protrusion relative to its groove wall gradually increases along the insertion direction of the coil part.

[0011] Furthermore, the third positioning structure includes a third positioning protrusion and a positioning groove. The third positioning protrusion is located in one of the first part and the second part, and the positioning groove is located in the other of the first part and the second part. The first part is the side of the contact part in the axial direction of the coil frame, and the second part is the groove wall of the limiting groove in the axial direction of the coil frame. The third positioning protrusion enters the positioning groove along the insertion direction of the coil frame.

[0012] Furthermore, the two limiting grooves are centrally symmetrical, with the first positioning structure fitting between the groove wall of one limiting groove on one side of the first direction and the corresponding contact portion, and the first positioning structure fitting between the groove wall of the other limiting groove on the other side of the first direction and the corresponding contact portion; the groove walls of the two limiting grooves that are far apart from each other are respectively fitted with the second positioning structure to the contact portion.

[0013] Furthermore, the coil frame and the limiting groove are fitted with a fourth positioning structure in the first direction. The fourth positioning structure includes a fourth positioning protrusion provided on the groove wall of the limiting groove in the first direction. The fourth positioning protrusion is in clearance fit or no clearance fit with the coil frame. The coil frame and the receiving cavity are fixed by adhesive dispensing. The coil frame and the iron core are fixed together by insert injection molding.

[0014] Furthermore, the second direction is a vertical direction, and the bottom end of the base has an opening leading to the receiving cavity. The coil portion is inserted into the receiving groove through the opening. The limiting groove is through-type in the second direction so that at least part of the pole shoe surface is exposed upwards. It also includes a cover plate, which is installed at the opening of the base to close the opening. It also includes an armature portion, multiple push clips and multiple sets of contact units. The base has a rotating shaft extending along one side of the second direction, and the armature portion is rotatably inserted through the rotating shaft. The armature portion has two mating parts arranged along the first direction for each contact part. The opposite inner surfaces of the two mating parts are the pole shoe surfaces, and the contact part is located between the two mating parts. Each set of contact units is installed on the base, and the moving spring portion of each contact unit is connected to the mating part corresponding to the armature portion through a push clip.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Because at least one pole shoe surface of the contact portion of the iron core has a first positioning structure that mates with the groove wall of the limiting groove in the first direction, and the contact portion of the iron core has a second positioning structure that mates with the limiting groove in the axial direction of the coil frame, this invention enables precise positioning of the coil portion in multiple directions, greatly improving the positioning accuracy of the coil portion and thus significantly improving the consistency of mechanical parameters after multiple striking actions of the product. In particular, the pole shoe surface of the contact portion is a large surface, and when it is positioned and mated with the limiting groove, the positioning position is close to the striking position of the pole shoe surface of the contact portion and the armature portion, resulting in a better positioning effect and better stability of the coil portion in the first direction.

[0017] 2. The contact portion and the limiting groove of the present invention are further fitted with a third positioning structure in the second direction, so that the present invention can achieve three-dimensional positioning of the coil portion, thereby further improving the positioning accuracy of the coil portion.

[0018] 3. The first positioning protrusion is disposed on the groove wall of the limiting groove in the first direction, and the protrusion of the first positioning protrusion relative to its groove wall gradually increases along the insertion direction of the coil portion. On the one hand, this eliminates the need to provide a first positioning protrusion on the pole shoe surface of the contact portion, ensuring the integrity of the pole shoe surface and reducing processing difficulty. On the other hand, the first positioning protrusion can provide guidance when the coil portion is inserted into the receiving cavity, allowing the coil portion to be guided first and then clamped, which does not affect assembly and ensures positioning accuracy. Similarly, the second positioning protrusion is disposed on the corresponding groove wall of the limiting groove, which can also play the role of guiding first and then clamping, which does not affect the assembly of the coil portion and ensures the positioning accuracy of the coil portion. In particular, the first positioning protrusion and the second positioning protrusion are assembled by simultaneously using the method of guiding first and then clamping, which can ensure clamping while facilitating assembly and reducing the generation of plastic debris or plastic breakage.

[0019] 4. The first and second protrusions serve as initial, precise positioning components. As the coil is further pressed in, the third protrusion begins to engage, achieving horizontal and vertical positioning once the coil is fully assembled. Finally, adhesive is applied to further reinforce and enhance the fixing strength.

[0020] 5. One of the limiting grooves has its groove wall on one side in the first direction cooperating with the corresponding contact part of the first positioning structure, and the other limiting groove has its groove wall on the other side in the first direction cooperating with the corresponding contact part of the first positioning structure; the groove walls of the two limiting grooves that are far apart from each other are respectively cooperating with the contact part of the second positioning structure, so that the base and the coil part of the present invention form a double L-shaped positioning structure, which makes the structure simpler and ensures reliable positioning of the coil part in the first direction and the axial direction of the coil frame.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention, which can achieve precise positioning of the coil portion, is not limited to the embodiments. Attached Figure Description

[0022] Figure 1 This is an exploded view of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the base of the present invention. Figure 1 ;

[0024] Figure 3 This is a three-dimensional structural diagram of the base of the present invention. Figure 2 ;

[0025] Figure 4 yes Figure 3 Enlarged schematic diagram of section I;

[0026] Figure 5 This is a top view of the base of the present invention;

[0027] Figure 6 This is a three-dimensional structural diagram of the base of the present invention. Figure 3 ;

[0028] Figure 7 This is a bottom view of the base of the present invention;

[0029] Figure 8 This is a three-dimensional structural schematic diagram of the coil portion of the present invention;

[0030] Figure 9 This is a front view of the base and coil portion of the present invention in an assembled state;

[0031] Figure 10 yes Figure 9 AA section view;

[0032] Figure 11 This is a top view of the base and coil portion of the present invention in an assembled state;

[0033] Figure 12 yes Figure 11 BB cross-sectional view;

[0034] Figure 13 yes Figure 11 CC section view;

[0035] Figure 14 This is a bottom view of the base and coil portion of the present invention in their assembled state;

[0036] Figure 15 yes Figure 14 DD sectional view;

[0037] Figure 16 This is a bottom view of the base of the present invention after the cover plate is placed on it;

[0038] Figure 17 This is a three-dimensional structural schematic diagram of the present invention (excluding the outer casing);

[0039] Figure 18 This is a top view of the present invention (excluding the outer casing);

[0040] In the figure, 1. Base, 11. Receiving cavity, 12. Limiting groove, 121. First positioning protrusion, 122. Second positioning protrusion, 123. Positioning groove, 124. Fourth positioning protrusion, 125. Groove wall, 13. Rotating shaft, 2. Coil part, 21. Coil frame, 22. Iron core, 221. Contact part, 2211. Pole shoe surface, 2212. Magnetic shielding sheet, 222. Third positioning protrusion, 23. Enamelled wire, 3. Cover plate, 4. Armature part, 41. Clamping part, 5. Pushing card, 6. Contact unit, 7. Outer shell. Detailed Implementation

[0041] In this invention, the terms "first," "second," and "third," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "inner," "outer," and "top / bottom" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is only for the convenience of describing the invention, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation on the scope of protection of this invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] Furthermore, in the description of this invention, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. In the description of this invention, unless otherwise explicitly specified and limited, terms such as "installation" and "connection" should be interpreted broadly. 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] Please see Figures 1-18As shown, an electromagnetic relay capable of precise positioning of the coil portion according to the present invention includes a coil portion 2 and a base 1. The coil portion 2 includes a coil frame 21 and an iron core 22. The coil frame 21 and the iron core 22 are fixed together by insert injection molding. Enamelled wire 23 is wound on the coil frame 21. The iron core 22 is approximately U-shaped and includes a core rod located in the coil frame 21 and two contact portions 221 located outside both ends of the coil frame 21. The two sides of each contact portion 221 facing away from each other in a first direction are pole shoe surfaces 2211. The base 1 is provided with a receiving cavity 11. The coil portion 2 is inserted into the receiving cavity 11 along one side in a second direction. The receiving cavity 11 is provided with limiting grooves 12 corresponding to the two contact portions 221, which limit the contact portions 221. Specifically, the two contact portions 221 pass through the two limiting grooves 12 one by one, and their pole shoe surfaces 2211 are at least partially exposed. The first direction and the second direction are perpendicular to each other and perpendicular to the axial direction of the coil frame 21. The opening is specifically located at the bottom end of the base 1. The axial direction of the coil portion 2 is consistent with the length direction of the base 1. The first direction is specifically the width direction of the base 1, and the second direction is specifically the vertical direction, which is also the height direction of the base 1. Therefore, the bottom end of the base 1 has an opening leading to the receiving cavity 11. The coil portion 2 is inserted into the receiving cavity 11 through this opening. Thus, the coil portion 2 is inserted into the receiving cavity 11 of the base 1 from bottom to top. The aforementioned limiting groove 12 is through-type in the second direction, so that at least part of the pole shoe surface of the contact portion 221 is exposed upwards.

[0044] In this embodiment, at least one pole shoe surface 2211 of each contact portion 221 is fitted with a first positioning structure in the groove wall of the limiting groove 12 in the first direction. Furthermore, the contact portion 221 and the limiting groove 12 are fitted with a second positioning structure in the axial direction of the coil frame 21 to position the contact portion 221. The contact portion 221 and the limiting groove 12 are fitted with a third positioning structure in at least one of the first direction, the second direction, and the axial direction of the coil frame. Specifically, the present invention achieves three-dimensional precise positioning of the coil portion 2 through the first positioning structure, the second positioning structure, and the third positioning structure.

[0045] Specifically, the first positioning structure includes at least one first positioning protrusion 121, which is disposed on one of the groove wall of the limiting groove 12 in the first direction and the pole shoe surface 2211 of the contact portion 221, and abuts against the other of the magnetic shielding sheets 2212 disposed on the groove wall of the limiting groove 12 in the first direction and the pole shoe surface 2211 of the contact portion 221, or on the pole shoe surface. Furthermore, the first positioning protrusion 121 is rib-shaped and extends along the second direction. In this embodiment, as... Figures 2-5As shown, the first positioning protrusion 121 is provided on the groove wall of the limiting groove 12 in the first direction, and the protrusion of the first positioning protrusion 121 relative to the groove wall gradually increases along the insertion direction of the coil portion 2. Therefore, the surface of the first positioning protrusion 121 is formed with a first guide surface, which can provide guidance when the contact portion 221 passes through the limiting groove 12, so that when the contact portion 221 passes through the limiting groove 12, it is first guided and then locked. Figures 9-11 As shown, this ensures both assembly accuracy and positioning precision. The first guide surface is specifically a slightly convex arc surface, as shown... Figure 13 As shown, but not limited to, in other embodiments, the first guide surface is an inclined surface. Since the first positioning protrusion 121 is not provided on the pole shoe surface 2211 of the contact portion 221, the integrity of the pole shoe surface 2211 can be ensured and the processing difficulty reduced. There are multiple first positioning protrusions 121, arranged along the axial direction of the coil frame. Specifically, there are two first positioning protrusions 121, such as... Figure 5 As shown, one of the positioning protrusions 121 abuts against the corresponding pole shoe surface 2211, and the other positioning protrusion 121 abuts against the magnetic shielding sheet 2212 provided on the corresponding pole shoe surface. The number of the first positioning protrusions 121 is not limited to this.

[0046] In this embodiment, the second positioning structure includes a second positioning protrusion 122, which is disposed on one of the groove wall of the limiting groove 12 in the axial direction of the coil frame 21 and the side of the contact portion 221, and abuts against the other of the groove wall of the limiting groove 12 in the axial direction of the coil frame 21 and the side of the contact portion 221. Specifically, as Figures 3-5 As shown, the second positioning protrusion 122 is provided on the groove wall of the limiting groove 12 in the axial direction of the coil frame 21, and the second positioning protrusion 122 is rib-shaped and extends along the second direction. The protrusion of the second positioning protrusion 122 relative to the groove wall gradually increases along the insertion direction of the coil part 2. Therefore, the surface of the second positioning protrusion 122 also has a second guide surface, which can provide guidance when the contact part 221 passes through the limiting groove 12, so that when the contact part 221 passes through the limiting groove 12, it is first guided and then locked. Figures 9-11 As shown, this ensures both assembly accuracy and positioning precision. The second guide surface is specifically a slightly convex arc surface, but is not limited to this; in other embodiments, the second guide surface is an inclined surface.

[0047] In this embodiment, the two limiting grooves 12 are centrally symmetrical, and the groove wall of one limiting groove 12 on one side in the first direction is engaged with the corresponding contact portion 221 by a first positioning structure (i.e., the groove wall of one limiting groove 12 on one side in the first direction is provided with a first positioning protrusion 121), and the groove wall of the other limiting groove 12 on the other side in the first direction is engaged with the corresponding contact portion 221 by a first positioning structure (i.e., the groove wall of the other limiting groove 12 on the other side in the first direction is provided with a first positioning protrusion 121); the groove walls of the two limiting grooves 12 that are far apart from each other are engaged with the contact portion 221 by a second positioning structure, i.e., the groove walls of the two limiting grooves 12 that are far apart from each other are provided with a second positioning protrusion 122, but it is not limited to this. In other embodiments, the groove walls 125 of the two limiting grooves 12 that are close to each other can also be engaged with the contact portion 221 by a second positioning structure. Therefore, the base 1 of the present invention forms a double L-shaped positioning structure for the coil portion 2: one limiting groove 12 has a first positioning protrusion 121 in the first direction and a second positioning protrusion 122 in the axial direction of the coil frame 21 corresponding to the two sides of the L-shape, forming one L-shaped positioning structure; the other limiting groove 12 has a first positioning protrusion 121 in the first direction and a second positioning protrusion 122 in the axial direction of the coil frame 21 corresponding to the two sides of the L-shape, forming the other L-shaped positioning structure. This simplifies the structure and ensures reliable positioning of the coil portion 2 in the first direction and the axial direction of the coil frame 21.

[0048] In this embodiment, the third positioning structure can position the coil portion 2 in the second direction and also in the axial direction of the coil frame 21. Furthermore, the first positioning structure and the third positioning structure are distributed along the second direction. Specifically, the first positioning structure is located at the top of the limiting groove 12, and the third positioning structure is located at the bottom of the limiting groove 12. In this way, the first positioning structure and the third positioning structure can perform segmented positioning of the coil frame 21 in the axial direction of the coil frame 21. This not only does not affect the positioning accuracy, but also avoids the problem of over-positioning caused by continuous positioning, which would increase the assembly and processing difficulty.

[0049] The third positioning structure includes a third positioning protrusion 222 and a positioning groove 123. The third positioning protrusion 222 is located in one of the first and second portions, and the positioning groove 123 is located in the other of the first and second portions. The first portion is the side of the contact portion 221 in the axial direction of the coil frame 21, and the second portion is the groove wall of the limiting groove 12 in the axial direction of the coil frame 21. The third positioning protrusion 222 enters the positioning groove 123 along the insertion direction of the coil frame 21. Specifically, as shown... Figures 6-8As shown, the positioning groove 123 is provided on the groove wall of the limiting groove 12 in the axial direction of the coil frame 21, and the third positioning protrusion 222 is provided on the side of the contact portion 221 in the axial direction of the coil frame 21. Furthermore, the positioning grooves 123 of the two limiting grooves 12 are respectively provided on the groove walls of the two limiting grooves 12 that are far apart from each other. The third positioning protrusion 222 abuts against the groove wall of the positioning groove 123 in the axial direction of the coil frame 21 and the groove wall in the second direction. Figure 12 , Figure 14 , Figure 15 As shown.

[0050] In this embodiment, the coil frame 21 and the limiting groove 12 are fitted with a fourth positioning structure in the first direction, specifically, as follows: Figure 6 As shown, the fourth positioning structure includes a plurality of fourth positioning protrusions 124 provided on each groove wall of the limiting groove 12 in the first direction. The fourth positioning protrusions 124 are in clearance fit or no clearance fit with the coil frame 21, thereby providing auxiliary positioning for the coil part 2. In addition, the gap between the coil frame 21 and the receiving cavity 11 is further fixed by adhesive dispensing, which can further enhance the effect of precise and stable positioning of the coil part 2.

[0051] The invention also includes a cover plate 3, which is installed at the opening of the base 1 to close the opening and further position the coil portion 2 in the second direction, such as... Figure 16 As shown. The invention also includes an armature portion 4, four pushers 5, and four sets of contact units 6. The base 1 has a rotating shaft 13 extending along one side of the second direction on the other side of the second direction. Specifically, the rotating shaft 13 is located at the top center of the base 1 and extends upward. The armature portion 4 is rotatably inserted through the rotating shaft 13. The armature portion 4 is fixed together by a plastic part and an armature through an insert injection molding process. The armature portion 4 has two engaging portions 41 arranged along the first direction at both ends of its length direction. The opposing inner surfaces of the two engaging portions 41 are pole shoe surfaces. The contact portion 221 of the iron core 22 is located between the two engaging portions 41. The four sets of contact units 6 are respectively installed on the base 1. The four engaging portions 41 of the armature portion 4 are respectively connected to the moving spring portions of the four sets of contact units 6 one by one through the pushers 5, as shown. Figure 17 , Figure 18 As shown. Each group of contact units 6 includes two groups of contacts distributed along a first direction, but is not limited to this. The armature portion 4 has a centrally symmetrical structure, and the two mating portions 41 at the same end have different dimensions in each direction.

[0052] The invention also includes a housing 7, which has an opening at the bottom and is connected to a base 1 to enclose the armature portion 4, four sets of contact units 6, four push cards 5, etc., within its housing cavity.

[0053] This invention provides an electromagnetic relay capable of precise positioning of the coil portion 2. This allows for precise positioning of the coil portion 2 in multiple directions, significantly improving its positioning accuracy and ensuring the consistency of the product's mechanical parameters after multiple engagements between the armature portion 4 and the coil portion 2. Specifically, the pole shoe surface 2211 of the contact portion 221 is a large surface. When it engages with the limiting groove 12, its positioning position is close to the engagement point between the pole shoe surface 2211 of the contact portion 221 and the armature portion 4, resulting in better positioning and improved stability of the coil portion 2 in the first direction. The coil portion 2 of this invention is positioned by a metal component (i.e., the iron core 22) in conjunction with the base 1, achieving high-precision and high-stability fixation of the coil portion 2.

[0054] During assembly of coil part 2, the first positioning protrusion 121 and the second protrusion 122 serve as initial precise positioning. As coil part 2 is further pressed in, the third positioning protrusion 222 begins to clamp, achieving clamping positioning in both the horizontal and vertical directions after assembly in the height direction. Finally, adhesive is applied to further strengthen the fixing strength.

[0055] The base 1 and the iron core 22 of the coil portion 2 of the present invention form a double L-shaped positioning structure, which simplifies the structure and ensures reliable positioning of the coil portion in the first direction, the axial direction of the coil frame. In particular, the iron core 22 has a centrally symmetrical structure, which ensures that the coil portion is accurately installed without tilting to either side.

[0056] The present invention provides an electromagnetic relay capable of precise positioning of the coil portion. The parts not covered (such as its working principle) are the same as or can be implemented using existing technologies.

[0057] The above embodiments are only used to further illustrate an electromagnetic relay capable of precise positioning of the coil portion according to the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay capable of precise positioning of a coil portion, comprising a coil portion and a base, the coil portion comprising a coil frame and an iron core fixed together, the iron core having two contact portions located outside both ends of the coil frame, the two opposite sides of the contact portions in a first direction being pole shoe surfaces; the base having a receiving cavity, the coil portion being inserted into the receiving cavity along one side in a second direction, the receiving cavity having limiting grooves corresponding to each contact portion, the first direction and the second direction being perpendicular to each other and perpendicular to the axial direction of the coil frame; characterized in that: At least one pole shoe surface of the contact portion is fitted with the groove wall of the limiting groove in the first direction to form a first positioning structure, and the contact portion and the limiting groove are fitted with a second positioning structure in the axial direction of the coil frame.

2. The electromagnetic relay capable of precise positioning of the coil section according to claim 1, characterized in that: The contact portion and the limiting groove are fitted with a third positioning structure in at least one of the first direction, the second direction, and the axial direction of the coil frame.

3. The electromagnetic relay capable of precise positioning of the coil section according to claim 1 or 2, characterized in that: The first positioning structure includes at least one first positioning protrusion, which is disposed in one of the groove wall of the limiting groove in the first direction and the pole shoe surface of the contact portion, and abuts against the other of the magnetic shielding sheets disposed on the groove wall of the limiting groove in the first direction and the pole shoe surface of the contact portion or on the pole shoe surface.

4. The electromagnetic relay capable of precise positioning of the coil section according to claim 3, characterized in that: The first positioning protrusion is rib-shaped and extends along the second direction; the first positioning protrusion is disposed on the groove wall of the limiting groove in the first direction, and the protrusion of the first positioning protrusion relative to the groove wall gradually increases along the insertion direction of the coil portion.

5. The electromagnetic relay capable of precise positioning of the coil portion according to claim 1, 2, or 4, characterized in that: The second positioning structure includes at least one second positioning protrusion, which is disposed on one of the groove wall of the limiting groove in the axial direction of the coil frame and the side of the contact portion in the axial direction of the coil frame, and abuts against the other of the groove wall of the limiting groove in the axial direction of the coil frame and the side of the contact portion in the axial direction of the coil frame.

6. The electromagnetic relay capable of precise positioning of the coil section according to claim 5, characterized in that: The second positioning protrusion is rib-shaped and extends along the second direction; the second positioning protrusion is provided on the groove wall of the limiting groove in the axial direction of the coil frame, and abuts against the corresponding pole shoe surface or the isolation piece provided on the corresponding pole shoe surface, and the protrusion of the second positioning protrusion relative to its groove wall gradually increases along the insertion direction of the coil part.

7. The electromagnetic relay capable of precise positioning of the coil section according to claim 2, characterized in that: The third positioning structure includes a third positioning protrusion and a positioning groove. The third positioning protrusion is located in one of the first part and the second part, and the positioning groove is located in the other of the first part and the second part. The first part is the side of the contact part in the axial direction of the coil frame, and the second part is the groove wall of the limiting groove in the axial direction of the coil frame. The third positioning protrusion enters the positioning groove along the insertion direction of the coil frame.

8. The electromagnetic relay capable of precise positioning of the coil section according to claim 1, characterized in that: The two limiting grooves are centrally symmetrical. The groove wall of one limiting groove on one side in the first direction is engaged with the corresponding contact part by the first positioning structure, and the groove wall of the other limiting groove on the other side in the first direction is engaged with the corresponding contact part by the first positioning structure. The groove walls of the two limiting grooves that are far apart from each other are engaged with the contact part by the second positioning structure.

9. The electromagnetic relay capable of precise positioning of the coil section according to claim 1, characterized in that: The coil frame and the limiting groove are fitted with a fourth positioning structure in the first direction. The fourth positioning structure includes a fourth positioning protrusion on the groove wall of the limiting groove in the first direction. The fourth positioning protrusion is in clearance fit or no clearance fit with the coil frame. The coil frame and the receiving cavity are fixed by dispensing adhesive. The coil frame and the iron core are fixed together by insert injection molding.

10. The electromagnetic relay capable of precise positioning of the coil section according to claim 1, characterized in that: The second direction is the vertical direction. The bottom end of the base has an opening leading to the receiving cavity. The coil portion is inserted into the receiving cavity through this opening. The limiting groove is through-type in the second direction so that at least part of the pole shoe surface is exposed upwards. It also includes a cover plate, which is installed at the opening of the base to close the opening. It also includes an armature portion, multiple push clips, and multiple sets of contact units. The base has a rotating shaft extending along one side of the second direction. The armature portion is rotatably inserted through the rotating shaft. The armature portion has two mating parts arranged along the first direction for each contact part. The opposite inner surfaces of the two mating parts are the pole shoe surfaces. The contact part is located between the two mating parts. Each set of contact units is installed on the base, and the moving spring portion of each contact unit is connected to the mating part corresponding to the armature portion through a push clip.

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