An electromagnetic relay

Abstract

The application discloses an electromagnetic relay, which comprises a base and a coil part, the coil part comprising a coil frame, a core arranged on the coil frame and a coil wound on the coil frame, the core having two contact parts, the two contact parts being respectively exposed on two ends of the coil frame, and each contact part having two pole shoe surfaces arranged oppositely in a preset direction, the preset direction being perpendicular to the axial direction of the coil frame; each contact part is provided with a positioning convex part, the base is provided with a positioning groove corresponding to each positioning convex part, and each positioning convex part is fixedly inserted into the corresponding positioning groove. The positioning precision of the coil part is greatly improved, and thus the consistency of mechanical parameters after multiple click actions of the product is greatly improved. In particular, the positioning convex part is made of metal material, which is helpful to reduce the high-temperature parameter change and the impact resistance of the product.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to an electromagnetic relay. 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] An existing electromagnetic relay, to facilitate top-down coil installation, separates the shaft portion from the base used for mounting the armature, forming a shaft bracket. After the coil is installed into the receiving cavity in the base from top to bottom, the shaft bracket is then connected to the base, and finally the armature is installed. This relay has the following drawbacks: the coil is fixed by a plastic protrusion on the coil bracket clamping into the base, without a dedicated metal structure for assembly and fixation. The plastic parts have lower precision and strength than metal parts and are less resistant to high-temperature deformation, resulting in insufficient positioning accuracy and poor high-temperature parameter stability. Furthermore, the shaft bracket is connected to the base using a single-sided snap-fit ​​connection, which can easily lead to uneven stress on the shaft bracket, causing the shaft to tilt and affecting the rotational stability and accuracy of the armature. Summary of the Invention

[0004] This invention addresses the positioning problem of the coil section in existing technologies by providing an electromagnetic relay that significantly improves the positioning accuracy of the coil section through structural improvements.

[0005] The technical solution adopted by the present invention to solve its technical problem is as follows: an electromagnetic relay, including a base and a coil part, the coil part including a coil frame, an iron core disposed on the coil frame and a coil wound on the coil frame, the iron core having two contact portions, the two contact portions being exposed outside the two ends of the coil frame in the axial direction, and each contact portion having two pole shoe surfaces arranged back to back in a preset direction, the preset direction being perpendicular to the axial direction of the coil frame; each of the two contact portions is provided with a positioning protrusion, and the base is provided with a positioning groove corresponding to each positioning protrusion, and each positioning protrusion is inserted and fixed in the corresponding positioning groove.

[0006] Furthermore, each positioning protrusion is interference-fitted with and / or glued to its corresponding positioning groove. Furthermore, the positioning protrusion is located on the side of the contact portion facing away from the coil in the axial direction of the coil frame, and the positioning protrusion protrudes from the bottom surface of the contact portion; each positioning protrusion is interference-fitted with its corresponding positioning groove in the preset direction and / or the axial direction of the coil frame.

[0007] Furthermore, the positioning protrusions on both sides of the preset direction are respectively interference-fitted with the corresponding positioning grooves, and the positioning protrusions of the two contact portions are respectively interference-fitted with the corresponding positioning grooves on the opposite outward side of the coil frame in the axial direction, or the positioning protrusions of the two contact portions are respectively interference-fitted with the corresponding positioning grooves on the opposite inward side of the coil frame in the axial direction.

[0008] Furthermore, the bottom of the positioning groove is provided with a first adhesive hole penetrating the bottom surface of the base. The first adhesive hole is connected to a first adhesive crawling gap and / or a lateral adhesive crawling gap. The first adhesive crawling gap is formed between the bottom of the positioning groove and the bottom surface of the positioning protrusion, and the lateral adhesive crawling gap is formed between at least one wall of the positioning groove and the corresponding side surface of the positioning protrusion.

[0009] Furthermore, the lateral adhesive crawling gap includes at least one of a second adhesive crawling gap, a third adhesive crawling gap, a fourth adhesive crawling gap, and a fifth adhesive crawling gap, wherein the second adhesive crawling gap and the third adhesive crawling gap are respectively formed by the gaps between the two sides of the positioning protrusion in the axial direction of the coil frame and the groove wall corresponding to the positioning groove, and the fourth adhesive crawling gap and the fifth adhesive crawling gap are respectively formed by the gaps between the two sides of the positioning protrusion in the preset direction and the groove wall corresponding to the positioning groove.

[0010] Furthermore, the bottom of the positioning groove is provided with two first adhesive holes arranged along the preset direction, and the bottom of the positioning groove is provided with a supporting protrusion that contacts and engages with the bottom surface of the positioning protrusion. The supporting protrusion forms two first adhesive crawling gaps arranged along the preset direction between the positioning groove and the positioning protrusion, and the two first adhesive crawling gaps are respectively connected to the two first adhesive holes in a one-to-one correspondence. The positioning protrusions of the two contact portions are respectively provided with first locking protrusions on the outwardly facing sides of the coil frame in the axial direction, which abut against the corresponding groove wall of the corresponding positioning groove. The first locking protrusions form two second adhesive crawling gaps arranged along the preset direction between the positioning protrusion and the positioning groove, and the two second adhesive crawling gaps are respectively connected to the two first adhesive crawling gaps in a one-to-one correspondence. The two groove walls of the positioning groove in the preset direction are respectively provided with grooves, so that the two groove walls of the positioning groove in the preset direction form the fourth adhesive crawling gap and the fifth adhesive crawling gap between the corresponding positioning protrusions.

[0011] Furthermore, it also includes a housing, which is connected to the base and encloses the coil portion within its cavity; the inner top surface of the housing is provided with a second locking protrusion corresponding to each contact portion, and each second locking protrusion abuts against the top surface of the corresponding contact portion; the preset direction and the axial direction of the coil frame are both horizontal directions.

[0012] Furthermore, the base has a receiving cavity corresponding to the coil portion, the coil portion is inserted into the receiving cavity, and the positioning groove is located in the receiving cavity.

[0013] Furthermore, it also includes a rotating shaft bracket and an armature portion. The rotating shaft bracket includes a support frame and a rotating shaft that is mounted on the support frame and extends upward. The support frame is connected to the base and spans the coil portion along the preset direction. The rotating shaft passes through a shaft hole provided in the armature portion, so that the armature portion can rotate around the rotating shaft and cooperate with the coil portion.

[0014] Furthermore, the support frame is provided with plug-in parts at both ends of the bottom in the preset direction, and the base is provided with slots corresponding to each plug-in part, and each plug-in part is inserted and fixed into the corresponding slot.

[0015] Furthermore, the insertion part is fixedly engaged with the slot by at least one of the following methods: hot riveting, interference fit, and adhesive application.

[0016] Furthermore, the bottom of the slot is provided with at least one second adhesive hole, which penetrates the bottom surface of the base, and a sixth adhesive gap is provided between the insertion part and the slot, which communicates with the second adhesive hole.

[0017] Furthermore, the tail end of the plug-in part is provided with at least one hot-riveting protrusion, the hot-riveting protrusion passes through the hole provided at the bottom of the slot and is hot-riveted, the hole passes through the bottom surface of the base; the hole and the second glue hole provided at the bottom of the slot are independent of each other, or the hole is the second glue hole, and glue is applied after the hot-riveting protrusion is hot-riveted, and the hot-riveting protrusion is provided with a glue-application clearance platform.

[0018] Furthermore, the plug-in portion and the slot are fitted with a positioning structure, which includes a positioning rib. The positioning rib is disposed on one of the side of the plug-in portion and the groove wall of the slot, and extends along the depth direction of the slot. The positioning rib abuts against the other of the side of the plug-in portion and the groove wall of the slot.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Because the two contact parts of the iron core are respectively provided with positioning protrusions, and the base is respectively provided with positioning grooves corresponding to each positioning protrusion, each positioning protrusion is inserted and fixed in the corresponding positioning groove. This invention greatly improves the positioning accuracy of the coil part, thereby greatly improving the consistency of mechanical parameters after multiple engagement actions of the product. In particular, the positioning protrusions are made of metal, which helps to reduce the changes in high-temperature parameters and the impact resistance of the product.

[0021] 2. Each positioning protrusion is fixed to its corresponding positioning groove by interference fit and / or adhesive application, making the fixing method of the positioning protrusion and positioning groove simple and convenient. In particular, when the positioning protrusion and positioning groove are fixed by both interference fit and adhesive application, the interference fit can be used to initially fix the coil part to the base, thereby not only improving the convenience of adhesive application, but also further improving the positioning accuracy of the coil part and the base.

[0022] 3. The positioning protrusion is located on the bottom side of the contact portion in the axial direction of the coil frame and facing away from the coil. The positioning protrusion protrudes from the bottom surface of the contact portion, avoiding the burr area of ​​the iron part and reducing the generation of assembly plastic debris. The positioning protrusion is interference-fitted with the corresponding positioning groove on both sides in the preset direction, ensuring that the coil part is accurately positioned in the preset direction, making the position of the coil part and the armature part more stable and firm when they are engaged. In addition, the positioning protrusions of the two contact portions are interference-fitted with the corresponding positioning groove on the opposite outward side in the axial direction of the coil frame, or the positioning protrusions of the two contact portions are interference-fitted with the corresponding positioning groove on the opposite inward side in the axial direction of the coil frame. This allows each positioning protrusion to be clamped to the positioning groove on only one side in the axial direction of the coil frame, thereby avoiding over-positioning of the positioning protrusion in the axial direction of the coil frame, which would be inconvenient for assembly, and providing lateral glue crawling space when further fixing with glue.

[0023] 4. The bottom of the positioning groove is provided with a first adhesive dispensing hole, forming a first adhesive creeping gap between the bottom of the positioning groove and the bottom surface of the positioning protrusion. This makes the adhesive dispensing operation more convenient and ensures that there is sufficient adhesive creeping gap between the positioning protrusion and the positioning groove. In particular, the lateral adhesive creeping gap allows the adhesive to fully flow into and wrap around the positioning protrusion, achieving a more secure bonding, fixation, and sealing.

[0024] 5. Since the support frame is fixed by being inserted into the slot on the base through the plug-in part, the present invention can ensure that the rotating shaft bracket is firmly connected to the base, and the rotating shaft will not tilt due to uneven force, nor will the rotating shaft bracket become loose during the product production turnover. This ensures that the rotating shaft position remains unchanged and the rotating shaft will not tilt, so that the armature part can achieve stable and precise rotation.

[0025] 5. The bottom of the slot is provided with a second glue dispensing hole, and a sixth glue crawling gap is provided between the bottom end of the plug and the bottom of the slot, which connects to the glue dispensing hole, making the glue dispensing operation more convenient and ensuring that there is a sufficient glue crawling gap between the plug and the slot.

[0026] 6. The tail end of the plug-in part is provided with at least one hot-riveting protrusion. The hot-riveting protrusion passes through the second glue hole provided at the bottom of the slot. The hot-riveting process is performed before the plug-in part is glued and fixed to the slot, which can realize the pre-fixation of the support frame and the base. This not only further improves the convenience of glue dispensing operation, but also further improves the positioning accuracy of the support frame and the base.

[0027] 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 is not limited to the embodiments. Attached Figure Description

[0028] Figure 1 This is an exploded view of the present invention as described in Embodiment 1;

[0029] Figure 2 This is a three-dimensional structural diagram of the coil portion of the present invention, as shown in Embodiment 1. Figure 1 ;

[0030] Figure 3 This is a three-dimensional structural diagram of the coil portion of the present invention, as shown in Embodiment 1. Figure 2 ;

[0031] Figure 4 This is a three-dimensional structural diagram of the base of the present invention in Embodiment 1;

[0032] Figure 5-1 Example 1 Figure 4 Enlarged schematic diagram of section G in the middle;

[0033] Figure 5-2 This is Example 1 Figure 4 An enlarged schematic diagram of part A in the middle;

[0034] Figure 6 This is a bottom view of the base of the present invention in Embodiment 1;

[0035] Figure 7 This is a three-dimensional structural diagram of the rotating shaft bracket of the present invention, as shown in Embodiment 1. Figure 1 ;

[0036] Figure 8 This is a three-dimensional structural diagram of the rotating shaft bracket of the present invention, as shown in Embodiment 1. Figure 2 ;

[0037] Figure 9 This is a three-dimensional structural diagram of the base, coil portion, and rotating shaft support of the present invention in an assembled state, as shown in Embodiment 1. Figure 1 ;

[0038] Figure 10 This is a three-dimensional structural diagram of the base, coil portion, and rotating shaft support of the present invention in an assembled state, as shown in Embodiment 1. Figure 2 ;

[0039] Figure 11 This is Example 1 Figure 9 A bottom view;

[0040] Figure 12 This is Example 1 Figure 11 GG cross-sectional view;

[0041] Figure 13 This is Example 1 Figure 12 Enlarged schematic diagram of part B in the middle;

[0042] Figure 14This is Example 1 Figure 9 Top view;

[0043] Figure 15 This is Example 1 Figure 14 FF sectional view;

[0044] Figure 16 This is Example 1 Figure 15 An enlarged schematic diagram of section C;

[0045] Figure 17 This is Example 1 Figure 14 AA section view;

[0046] Figure 18 This is Example 1 Figure 14 BB section view;

[0047] Figure 19 This is Example 1 Figure 14 CC section view;

[0048] Figure 20 This is Example 1 Figure 9 The main view;

[0049] Figure 21 This is Example 1 Figure 20 DD sectional view;

[0050] Figure 22 This is a three-dimensional structural schematic diagram of the armature portion of the present invention in Embodiment 1;

[0051] Figure 23 This is a top view of the present invention in Embodiment 1;

[0052] Figure 24 This is Example 1 Figure 23 EE sectional view;

[0053] Figure 25 This is Example 1 Figure 24 An enlarged schematic diagram of section D in the middle;

[0054] Figure 26 This is Example 1 Figure 24 An enlarged schematic diagram of section E in the middle;

[0055] Figure 27 This is Example 1 Figure 24 Enlarged schematic diagram of section F in the middle;

[0056] Figure 28 This is a three-dimensional structural diagram of the base of the present invention in Embodiment 2;

[0057] Figure 29 This is Example 2 Figure 28 Enlarged schematic diagram of section H in the middle;

[0058] Figure 30 This is a cross-sectional view of the present invention in Embodiment 2. Figure 1 ;

[0059] Figure 31 This is Example 2 Figure 30 Enlarged schematic diagram of section I;

[0060] Figure 32 This is a cross-sectional view of the present invention in Embodiment 2. Figure 2 ;

[0061] Figure 33 This is Example 2 Figure 32 An enlarged schematic diagram of section J in the middle;

[0062] Figure 34 This is a three-dimensional structural schematic diagram of the outer shell of the present invention in Embodiment 3;

[0063] Figure 35 This is a cross-sectional view of the present invention in Embodiment 3;

[0064] In the diagram, 1. Base; 11. Support platform; 111. Slot; 1111. Positioning rib; 1112. Bottom gap; 1113. Side gap; 12. Second adhesive hole; 13. Receiving cavity; 14. Positioning groove; 141. First clamping protrusion; 142. Supporting protrusion; 143. First groove wall; 144. Second groove wall; 145. Groove; 15. First adhesive hole; 151. First adhesive creeping gap; 152. Second adhesive creeping gap; 153. Third adhesive creeping gap; 154. Fourth adhesive creeping gap; 155. Fifth adhesive creeping gap; 16. Insertion hole; 2. Coil section; 21. Coil frame; 211. Protection. 22. Platform, 22. Iron core, 221. Contact part, 222. Positioning protrusion, 2221. First side, 2222. Second side, 23. Coil, 24. Coil lead-out foot, 3. Rotary shaft bracket, 31. Rotary shaft, 32. Support frame, 321. Top plate, 322. Side plate, 323. Second protrusion, 33. Insertion part, 331. Hot-riveting protrusion, 332. Adhesive-dispensing recessed platform, 34. Boss, 4. Armature part, 41. Shaft hole, 411. Recessed groove, 42. Clamping part, 43. Plastic part, 431. First protrusion, 44. Iron core, 5. Outer shell, 51. Limiting protrusion, 52. Second clamping protrusion. Detailed Implementation

[0065] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be interpreted as indicating or implying relative importance.

[0066] Furthermore, in the description of this invention, unless otherwise stated, "multiple" means two or more, and "at least one" means one 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, the terms "installation," "setting," "connection," etc., 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.

[0067] Please see Figures 1-27 As shown, an electromagnetic relay of the present invention includes a base 1, a rotating shaft support 3, an armature portion 4, a coil portion 2, and a housing 5. The coil portion 2 includes a coil frame 21 and an iron core 22, which are fixed together by insert injection molding. A coil 23 is wound on the coil frame 21. The iron core 22 is generally U-shaped and includes a core rod located in the coil frame 21 and two contact portions 221 exposed at both ends in the axial direction of the coil frame 21. Each contact portion 221 has two pole shoe surfaces facing away from each other in a predetermined direction, which is perpendicular to the axial direction of the coil frame 21. The base 1 is provided with a receiving cavity 13 for the coil portion 2 to be inserted from top to bottom. The coil portion 2 is horizontal and is inserted into the receiving cavity 13. The coil frame 1 and the receiving cavity 13 are the same or substantially the same size in the predetermined direction, so that the receiving cavity 13 can provide initial positioning for the coil portion 2. Furthermore, the wall of the receiving cavity 13 is provided with a guide structure to facilitate the quick insertion of the coil portion 2 into the receiving cavity 13. The two contact portions 221 of the iron core are respectively provided with positioning protrusions 222, and the receiving cavity 13 is provided with positioning grooves 14 corresponding to each positioning protrusion 222. Each positioning protrusion 222 is inserted and fixed into its corresponding positioning groove 14. Specifically, each positioning protrusion 222 is fixed to its corresponding positioning groove 14 by interference fit and / or adhesive application, making the fixing structure between the positioning protrusion 222 and the positioning groove 14 relatively simple and easy to assemble.

[0068] The rotating shaft bracket 3 includes a support frame 32 and a rotating shaft 31 that is mounted on the support frame 32 and extends upward. The support frame 32 is connected to the base 1 and spans the coil portion 2 along the preset direction. The rotating shaft 31 passes through the shaft hole 41 of the armature portion 4, and the two are in clearance fit, allowing the armature portion 3 to rotate around the rotating shaft 31 and engage with the coil portion 2. The outer shell 5 is connected to the base 1 and encloses the coil portion 2, the rotating shaft bracket 3, and the armature portion 4 within its shell cavity. The preset direction and the axial direction of the coil frame 21 are both horizontal. Specifically, the preset direction is the front-to-back direction, and the axial direction of the coil frame 21 is the left-to-right direction, but it is not limited to this.

[0069] like Figure 2 , Figure 3 As shown, the positioning protrusion 222 is located on the bottom side of the contact portion 221 in the axial direction of the coil frame 21 and facing away from the coil 23, and the positioning protrusion 222 protrudes from the bottom surface of the contact portion 221. Each positioning protrusion 222 is respectively interference-fitted with and glued to the corresponding positioning groove 14, and the positioning protrusion 222 and the positioning groove 14 are interference-fitted in the axial direction of the coil frame 21 and / or the preset direction. Specifically, the positioning protrusion 222 is interference-fitted with the corresponding positioning groove 14 on both sides in the preset direction to ensure that the coil portion 2 is accurately positioned in the preset direction, so that the coil portion 2 and the armature portion 4 are more stably and firmly positioned when they are engaged. In addition, the positioning protrusions 222 of the two contact portions 221 are interference-fitted with the corresponding positioning grooves on the opposite outward side in the axial direction of the coil frame 21, but this is not limited to this. In other embodiments, the positioning protrusions of the two contact portions are interference-fitted with the corresponding positioning grooves on the opposite inward side in the axial direction of the coil frame. This avoids over-positioning of the positioning protrusion in the axial direction of the coil frame, which would make assembly difficult, and also provides lateral glue-climbing space when further fixing with adhesive.

[0070] The two sides of the positioning protrusion 222 in the axial direction of the coil frame are defined as the first side 2221 and the second side 2222, respectively. The first side 2221 is located on the side of the second side 2222 away from the coil frame 21. The positioning groove 14 has two opposing groove walls in the axial direction of the coil frame, which are defined as the first groove wall 143 and the second groove wall 144, respectively. The first groove wall 143 is opposite to the first side 2221, and the second groove wall 144 is opposite to the second side 2222. The first side 2221 of the positioning protrusion 222 abuts against the first groove wall 143 of the positioning groove 14 or a first locking protrusion 141 provided on the first groove wall 143.

[0071] In this embodiment, the positioning groove 14 is provided with a first adhesive dispensing hole 15, which is specifically located at the bottom of the positioning groove 14 and penetrates the bottom surface of the base 1, such as... Figure 10 As shown. The first adhesive dispensing hole 15 is connected to the adhesive crawling gap formed between the positioning groove 14 and the positioning protrusion 222. This adhesive crawling gap includes a first adhesive crawling gap and / or a lateral adhesive crawling gap. The first adhesive crawling gap 151 is formed between the bottom of the positioning groove 14 and the bottom of the positioning protrusion 222, as shown. Figure 12 , Figure 13 As shown. The second groove wall 144 can restrict the flow of adhesive entering from the first adhesive hole 15 out of the positioning groove 14.

[0072] Furthermore, a lateral adhesive creeping gap is provided between the side of the positioning protrusion 222 and the groove wall of the positioning groove 14, connecting the second adhesive creeping gap 151, so that the adhesive can fully flow into and wrap the positioning protrusion 222, achieving a relatively firm adhesive fixation and sealing. The lateral adhesive creeping gap includes at least one of the second adhesive creeping gap 152, the third adhesive creeping gap 153, the fourth adhesive creeping gap, and the fifth adhesive creeping gap. The second adhesive creeping gap 152 and the third adhesive creeping gap 153 are respectively formed by the gaps between the two sides (i.e., the first side side 2221 and the second side side 2222) of the positioning protrusion 222 in the axial direction of the coil frame 21 and the groove wall (i.e., the first groove wall 143 / the second groove wall 144) corresponding to the positioning groove. The fourth adhesive creeping gap and the fifth adhesive creeping gap are respectively formed by the gaps between the two sides of the positioning protrusion in the preset direction and the groove wall corresponding to the positioning groove. Specifically, in this embodiment, the lateral adhesive creeping gap includes the second adhesive creeping gap 152 and the third adhesive creeping gap 153, but is not limited to this.

[0073] In this embodiment, as Figure 6 As shown, the bottom of the positioning groove 14 is provided with two first adhesive holes 15 arranged along the preset direction. Figure 5-1 As shown, the bottom of the positioning groove 14 is provided with a supporting protrusion 142 that contacts and engages with the bottom surface of the positioning protrusion 222. This supporting protrusion 142 creates two first adhesive-feeding gaps 151 between the positioning groove 14 and the positioning protrusion 222. The two first adhesive-feeding gaps 151 are located on opposite sides of the supporting protrusion 142 in the preset direction, and each of the two first adhesive-feeding gaps 151 corresponds to and communicates with one of the two first adhesive holes. A first clamping protrusion 141 is provided on the first groove wall 143, creating two second adhesive-feeding gaps 152 arranged along the preset direction between the first groove wall 143 and the first side surface 2221 of the positioning protrusion 222. Each of the two first adhesive-feeding gaps 151 corresponds to and communicates with the other two second adhesive-feeding gaps 152. For example... Figure 13 , Figure 16As shown. The support protrusion 142 and the first clamping protrusion 141 are respectively in the shape of a boss, but are not limited to this. In other embodiments, they may also be in the shape of a rib.

[0074] like Figure 3 As shown, the coil section 2 has two coil lead-out feet 24, which are located at both ends of the coil frame 21 and on one side of the iron core 22 in the predetermined direction. The coil frame 21 has a protective platform 211 at each coil lead-out foot 24, which fully or partially encloses the coil lead-out foot 24 to prevent it from tilting during insertion. The base 1 has insertion holes 16 corresponding to each coil lead-out foot. The coil lead-out foot 24, connected to the protective platform 211, passes through the insertion hole 16 and is fixed with adhesive. Figure 10 As shown. Therefore, fixing the coil lead 24 can also improve the positioning accuracy of the coil section 2.

[0075] As a preferred structure, the support frame 32 has insertion parts 33 at both ends of its bottom in the preset direction, and the base 1 has slots 111 corresponding to each insertion part 33. Each insertion part 33 is inserted and fixed into the corresponding slot 111. Specifically, the insertion part 33 is fixedly engaged with the slot 111 by at least one of the following methods: hot riveting, interference fit, and adhesive application.

[0076] like Figure 7 , Figure 8 As shown, the pivot bracket 3 adopts a symmetrical structure, and its support frame 32 is roughly U-shaped, including a top plate 321 and two side plates 321. The two side plates 321 are respectively located at opposite ends of the bottom surface of the top plate 321 in the preset direction and are parallel to each other. The pivot 31 is located in the middle of the top surface of the top plate 321, and the bottom ends of the two side plates 321 are respectively provided with insertion parts 33. Figure 4 As shown, the base 1 has two support platforms 11, which correspond one-to-one with the two side plates 321. Each support platform 11 has a slot 111. The portions of the bottom of the two side plates 321 that do not have the insertion part 33 rest on the top of the corresponding support platform 11. Figure 19 As shown.

[0077] The insertion part 33 is fitted with a positioning structure in the slot 111. This positioning structure includes a positioning rib 1111, which is located on one side of the insertion part 33 and on one side wall of the slot 111, extending along the depth direction of the slot 111. The positioning rib 1111 abuts against the other side of the insertion part 33 and the other side wall of the slot 111. Thus, even if the slot 111 is deformed, precise positioning of critical positions can be achieved through the interference fit of the positioning rib 1111. Specifically, in this embodiment, the positioning rib 1111 is located on the side wall of the slot 111.

[0078] The insertion part 33 is plate-shaped, and the slot 111 is elongated. The insertion part 33 has guide surfaces on its bottom sides along its length to facilitate insertion into the slot 111. The slot 111 has multiple positioning ribs 1111 on at least one wall along its width. Figure 4 , Figure 5-2 As shown, the insertion part 33 and the slot 111 are tightly fitted in the width direction of the slot 111. The maximum length of the insertion part 33 is the same as or substantially the same as the length of the slot 111. Therefore, the slot 111 does not have a positioning rib 1111 along its groove wall in its length direction. However, it is not limited to this. In other embodiments, positioning ribs 1111 may be provided on at least one groove wall of the slot 111 in its length direction, depending on actual needs.

[0079] like Figure 6 As shown, the bottom of the slot 111 is provided with at least one second adhesive hole 12, which penetrates the bottom surface of the base 1. A sixth adhesive clearance is provided between the insertion part 33 and the slot 111, communicating with the second adhesive hole 12. This sixth adhesive clearance includes a bottom gap 1112 formed between the bottom surface of the insertion part 33 and the bottom of the slot 111, and / or a side gap 1113 formed between the side surface of the insertion part 33 and the wall of the slot 111. Specifically, in this embodiment, the sixth adhesive clearance includes the bottom gap 1112 formed between the bottom surface of the insertion part 33 and the bottom of the slot 111, such as... Figure 19 As shown; the sixth adhesive clearance also includes a side clearance 1113 formed between the side of the insertion part 33 and the groove wall of the slot 11 (e.g., the groove wall of the slot 111 where the positioning rib 1111 is provided), such as Figure 21 As shown, the side gap 1113 connects to the bottom gap 1112, which helps to further improve the adhesive fixing effect between the insertion part 33 and the slot 11. In this embodiment, the number of second adhesive holes 12 provided at the bottom of each slot 111 is specifically two, but not limited to this, and the two second adhesive holes 12 are arranged along the length direction of the slot 111.

[0080] As a preferred structure, such as Figure 2 , Figure 3As shown, each insertion part 33 has at least one hot-riveting protrusion 331 at its tail end. The hot-riveting protrusion 331 passes through a hole in the bottom of the slot 111 and is hot-riveted to secure it. The hole penetrates the bottom surface of the base 1 and is the second adhesive dispensing hole 12 mentioned above. However, it is not limited to this; in other embodiments, this hole and the second adhesive dispensing hole 12 are different holes. The hot-riveting protrusion 331 is hot-riveted before the insertion part 33 is fixed to the slot 111 with adhesive. This allows for pre-fixation of the support frame 32 and the base 1, facilitating subsequent adhesive dispensing operations. In this way, the position of the rotating shaft support 3 can be prevented from changing due to temperature or vibration during turnover or during the adhesive drying and curing process. Furthermore, as a load-bearing component, the pivot bracket 3 is limited in size and structure, making it difficult to enlarge the riveting protrusion 331. Riveting alone provides limited strength. Therefore, further adhesive application can significantly improve the fixing strength between the insertion part and the slot. However, for larger products, where the riveting protrusion can be enlarged, the insertion part and slot can be fixed solely by riveting. In this embodiment, each insertion part 33 has two riveting protrusions 331 at its tail end, but this is not a limitation. The two riveting protrusions 331 are arranged along the length of the insertion part 33. The riveting protrusion has an adhesive clearance countersink 332, which prevents the riveting protrusion 331 from covering the adhesive hole 12 after riveting, thus facilitating the flow of adhesive into the sixth adhesive gap between the insertion part 33 and the slot 111, thereby achieving precise and secure adhesive bonding.

[0081] like Figure 22 As shown, the top surface of the armature portion 4 is provided with one or more first protrusions 431. These first protrusions 431 serve as sliding contact positions for the armature portion 4 to engage with the inner top surface of the outer casing 5 during rotation. The armature portion 4 specifically includes an armature and a plastic part 43, which are integrally injection molded together. The first protrusions 431 are specifically disposed on the plastic part 43, and the first protrusions 431 are of a convex structure with a surface that is an arcuate spherical surface. In other embodiments, the first protrusions 431 are of a rib structure. The provision of the first protrusions 431 prevents the injection molding burrs on the sliding contact area of ​​the armature portion 4 from jamming or interfering when the armature portion 4 contacts the outer casing 5 during rotation, making the sliding friction smoother and reducing the risk of injection molding burrs detaching due to friction and forming free plastic debris.

[0082] like Figures 24-27 As shown, the inner top surface of the outer casing 5 is provided with a limiting protrusion 51 corresponding to the rotating shaft 31. The limiting protrusion 51 and the tail end of the rotating shaft 31 are in clearance fit, but not limited to this. In other embodiments, the limiting protrusion 51 abuts against the tail end of the rotating shaft 31. For example... Figure 22As shown, the top surface of the armature part 4 is provided with a groove 411 around the shaft hole 41, which leads to the shaft hole 41. The limiting protrusion 51 enters the groove 411. During the rotation of the armature part 4, the bottom surface of the groove 411 cooperates with the bottom end of the limiting protrusion 51 to limit the rotation, which can make the rotation of the armature part 4 more reliable.

[0083] like Figure 7 As shown, the top surface of the support frame 32 (i.e., the top surface of the top plate 321) is provided with one or more second protrusions 423, which contact and engage with the armature portion 4 during rotation. Specifically, in this embodiment, there are two second protrusions 423, with two second ribs located at both ends of the top plate 321 in the length direction, and the second protrusions 423 are rib structures extending along the width direction of the top plate 321. In other embodiments, the second protrusions 423 are convex structures with a surface that is an arc spherical surface. The top surface of the support frame 32 is provided with a ring of bosses 324 located around the rotating shaft 31, which supports the armature portion 4, and the top surface of the bosses 324 is flush with the top of the second protrusions 423.

[0084] like Figure 22 As shown, the armature part 4 has two mating parts 42 arranged along its width at both ends in the length direction. The opposite inner surfaces of the two mating parts 42 are pole shoe surfaces, and the two mating parts 42 are one large and one small. Specifically, the armature part 4 has a centrally symmetrical structure.

[0085] The two support platforms 11 are located on both sides of the accommodating cavity 13 in the width direction. After the coil part 2 is assembled, the rotating shaft bracket 3 can be installed, and then the armature part 4 can be installed. The two contact parts 221 of the iron core 22 of the coil part are respectively engaged between the two pole shoe surfaces at both ends of the armature part 4.

[0086] The present invention also includes a contact portion 6 and a plurality of push cards 7. The contact portion 6 includes a plurality of contact units, each of which is mounted on the base 1. The contact portion 6 and the coil portion 2 are arranged along the width direction of the base 1. The moving spring portion of each contact unit cooperates with the corresponding snap-fit ​​portion 42 of the armature portion 4 through the push card 7, so that the armature portion 4 rotates to push each push card 7 to move, thereby controlling the corresponding contact unit to close or open.

[0087] This invention provides an electromagnetic relay that significantly improves the positioning accuracy of the coil portion 2, thereby greatly enhancing the consistency of mechanical parameters after multiple engagement / disengagement actions. Specifically, the positioning protrusion 222 is made of metal, which helps reduce changes in high-temperature parameters and improves the product's impact resistance. Furthermore, the interference fit between the positioning protrusion 222 and the positioning groove 14 allows for initial fixation of the coil portion 2 and the base 1, improving not only the convenience of subsequent adhesive dispensing operations but also further enhancing the positioning accuracy of the coil portion 2 and the base 1. Moreover, the positioning protrusion 222 avoids burr areas on metal parts, reducing the generation of assembly plastic debris.

[0088] The rotating shaft bracket 3 of this invention adopts a completely symmetrical structure, ensuring uniform force on both sides during assembly and aligning the axis of the rotating shaft 31 with respect to the two slots 111 of the base 1 after assembly. The rotating shaft bracket 3 is provided with hot-riveting protrusions 331, which allow for precise positioning and engagement between the rotating shaft bracket 3 and the base 1 using tooling. Simultaneously, four hot-riveting protrusions 331 are used for four-point hot-pressing to achieve pre-fixation in a precise positioning state, facilitating subsequent adhesive application. This invention employs a symmetrical design of the rotating shaft bracket 3 and the aforementioned fixing structure to ensure symmetry of the pole shoe surfaces on both sides about the axis center during the rotation of the armature part 4 around the rotating shaft 31. The shaft hole 41 of the armature part 4 and the rotating shaft 31 are designed with a small clearance fit. This facilitates flexible rotation of the armature part 4 around the rotating shaft 31, preventing jamming under temperature shock; furthermore, the small clearance fit can appropriately compensate for assembly errors, providing a certain tolerance margin and improving the consistency of contact between the pole shoe surfaces on both sides during the rotation of the armature part 4.

[0089] Example 2

[0090] Please see Figures 28-33 As shown, the electromagnetic relay of the present invention differs from the above-described embodiment 1 in that: the lateral adhesive creepage gap includes, in addition to the second adhesive creepage gap 152 formed between the first groove wall 143 and the first side surface 2221 of the positioning protrusion 222, and the third adhesive creepage gap 153 formed between the second groove wall 144 and the second side surface 2222 of the positioning protrusion 222, a fourth adhesive creepage gap 154 ​​and a fifth adhesive creepage gap 155 formed between the two sides of the positioning protrusion 222 in the preset direction and the groove walls corresponding to the positioning groove 14, respectively. Specifically, the two groove walls of the positioning groove 14 in the preset direction are respectively provided with grooves 145 at the outward end in the axial direction of the coil frame. The fourth adhesive creepage gap 154 ​​and the fifth adhesive creepage gap 155 are formed by the grooves 145 and the sides corresponding to the positioning protrusion 222, and the punching burrs of the iron core 22 are accommodated. The fourth adhesive creepage gap 154 ​​is laterally connected to one of the second adhesive creepage gaps 152, and the fifth adhesive creepage gap 155 is laterally connected to the other second adhesive creepage gap 152. In this way, the adhesive covers the positioning protrusion 222 on all four sides, thereby achieving a relatively firm bonding, fixation and sealing.

[0091] Example 3

[0092] Please see Figure 34 , 35 As shown, the electromagnetic relay of the present invention differs from the embodiments described above in that: the inner top surface of the outer casing 5 is provided with a second locking protrusion 52 corresponding to each contact portion 221, and each second locking protrusion 52 abuts against the top surface of the corresponding contact portion 221. This allows the present invention to accurately position the coil portion 2 in six directions: left-right, front-back, and up-down, further improving the positioning accuracy of the coil portion 2, thereby greatly improving the consistency of mechanical parameters after multiple engagement / disengagement actions.

[0093] In this embodiment, each positioning protrusion 222 and the corresponding positioning groove 14 can be further fixed with adhesive, or no adhesive treatment can be performed.

[0094] The electromagnetic relay of the present invention, the parts not covered (such as the structure and working principle of the contact part 6, the push card 7, etc.) are the same as or can be implemented by existing technology.

[0095] The above embodiments are only used to further illustrate an electromagnetic relay of the present invention, but 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, comprising a base and a coil portion, the coil portion comprising a coil frame, an iron core disposed on the coil frame, and a coil wound on the coil frame, the iron core having two contact portions exposed at both ends of the coil frame in the axial direction, and each contact portion having two pole shoe surfaces disposed back-to-back in a predetermined direction, the predetermined direction being perpendicular to the axial direction of the coil frame; characterized in that: The two contact portions are respectively provided with positioning protrusions, the base is respectively provided with positioning grooves corresponding to the positioning protrusions, and each positioning protrusion is fixedly inserted into the corresponding positioning groove.

2. The electromagnetic relay according to claim 1, characterized in that: Each positioning protrusion is in interference fit and / or is fixed by glue injection with the corresponding positioning groove.

3. The electromagnetic relay according to claim 2, characterized in that: The positioning protrusions are located on the side of the contact portions facing away from the coil in the axial direction of the bobbin, and protrude from the bottom surface of the contact portions; each positioning protrusion is in interference fit with the corresponding positioning groove in the preset direction and / or in the axial direction of the bobbin.

4. The electromagnetic relay according to claim 3, characterized in that: The positioning protrusions on both sides of the contact portions in the preset direction are in interference fit with the corresponding positioning grooves, or the positioning protrusions on the side facing away from each other in the axial direction of the bobbin are in interference fit with the corresponding positioning grooves.

5. Electromagnetic relay according to claim 3 or 4, characterized in that: The groove bottom of the positioning groove is provided with a first glue injection hole penetrating through the bottom surface of the base, the first glue injection hole is in communication with a first glue injection gap and / or a lateral glue injection gap, the first glue injection gap is formed between the groove bottom of the positioning groove and the bottom surface of the positioning protrusion, and the lateral glue injection gap is formed between at least one groove wall of the positioning groove and the corresponding side surface of the positioning protrusion.

6. The electromagnetic relay according to claim 5, characterized in that: The lateral glue injection gap includes at least one of a second glue injection gap, a third glue injection gap, a fourth glue injection gap and a fifth glue injection gap, the second glue injection gap and the third glue injection gap are respectively formed between the two side surfaces of the positioning protrusion in the axial direction of the bobbin and the corresponding groove walls of the positioning groove, and the fourth glue injection gap and the fifth glue injection gap are respectively formed between the two side surfaces of the positioning protrusion in the preset direction and the corresponding groove walls of the positioning groove.

7. The electromagnetic relay according to claim 6, characterized in that: The groove bottom of the positioning groove is provided with two first glue injection holes arranged in the preset direction, the groove bottom of the positioning groove is provided with a supporting protrusion in contact with the bottom surface of the positioning protrusion, the supporting protrusion forms two first glue injection gaps arranged in the preset direction between the positioning groove and the positioning protrusion, and the two first glue injection gaps are respectively in one-to-one correspondence with the two first glue injection holes; the side of the positioning protrusion of the contact portion facing away from each other in the axial direction of the bobbin is respectively provided with a first clamping protrusion in abutting fit with the corresponding groove wall of the corresponding positioning groove, the first clamping protrusion forms two second glue injection gaps arranged in the preset direction between the positioning protrusion and the positioning groove, and the two second glue injection gaps are respectively in one-to-one correspondence with the two first glue injection gaps; the two groove walls of the positioning groove in the preset direction are respectively provided with grooves, so that the two groove walls of the positioning groove in the preset direction are respectively in the fourth glue injection gap and the fifth glue injection gap with the corresponding positioning protrusion.

8. The electromagnetic relay according to any one of claims 1 to 4, characterized in that: The housing is connected to the base and contains the coil part in a cavity of the housing; a second clamping protrusion is arranged on an inner top surface of the housing corresponding to each contact part and abuts against a top surface of the corresponding contact part; the preset direction and the axial direction of the coil holder are horizontal directions.

9. The electromagnetic relay according to any one of claims 1 to 4, characterized in that: The base is provided with a receiving cavity corresponding to the coil part, the coil part is arranged in the receiving cavity, and the positioning groove is located in the receiving cavity.

10. The electromagnetic relay of claim 1, wherein: The support frame is connected to the base and extends across the coil part in the preset direction, and the shaft is arranged in the shaft hole of the armature part, so that the armature part can rotate around the shaft and cooperate with the coil part.

11. The electromagnetic relay according to claim 10, characterized in that: The support frame is connected to the base and extends across the coil part in the preset direction, and the shaft is arranged in the shaft hole of the armature part, so that the armature part can rotate around the shaft and cooperate with the coil part.

12. The electromagnetic relay according to claim 11, characterized in that: The support frame is connected to the base and extends across the coil part in the preset direction, and the shaft is arranged in the shaft hole of the armature part, so that the armature part can rotate around the shaft and cooperate with the coil part.

13. The electromagnetic relay of claim 12, wherein: The insertion part is fixedly connected to the corresponding insertion slot in at least one of the following modes: hot riveting, interference fit, and dispensing.

14. The electromagnetic relay of claim 13, wherein: The slot bottom of the insertion slot is provided with at least one second dispensing hole, the second dispensing hole penetrates the bottom surface of the base, and a sixth dispensing gap is arranged between the insertion part and the insertion slot and communicates with the second dispensing hole.

15. The electromagnetic relay of claim 11, wherein: The tail end of the insertion part is provided with at least one hot riveting protrusion, the hot riveting protrusion is arranged in a hole arranged in the slot bottom of the insertion slot and is subjected to hot riveting treatment, the hole penetrates the bottom surface of the base; the hole and the second dispensing hole arranged in the slot bottom of the insertion slot are independent of each other, or the hole is the second dispensing hole and is subjected to dispensing after the hot riveting treatment of the hot riveting protrusion, and the hot riveting protrusion is provided with a dispensing accommodation relief. The insertion part and the insertion slot are provided with a positioning structure, the positioning structure comprises a positioning protrusion, the positioning protrusion is arranged on one of the side surface of the insertion part and the slot wall of the insertion slot and extends along the depth direction of the insertion slot, and the positioning protrusion abuts against the other one of the side surface of the insertion part and the slot wall of the insertion slot.

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