Ultra-compact electromagnetic relay with highly reliable insulation

Abstract

The present disclosure provides a highly reliable, insulated, ultra-compact electromagnetic relay including a coil portion and a fixed spring portion, the coil portion including a coil holder, the coil holder including two flanges, the two flanges being located at both ends of the coil holder, the fixed spring portion including a fixed spring provided at at least one end of the coil holder, the fixed spring including a contact portion including a fixed contact, the contact portion of the fixed spring being provided at a position close to the flange of the coil holder, and the flange of the coil holder has a first barrier and a second barrier protruding upward for jointly positioning the contact portion of the fixed spring in two horizontal directions. The present disclosure can avoid uncontrollable variations in the position of the contact portion of the fixed spring when it is attached by the first barrier and the second barrier.

Description

[Technical field]

[0001] [Cross-reference to related applications] This disclosure claims priority to a Chinese patent application with application number 202110213966.3, filed on February 25, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of relay technology, and more particularly to a highly reliable, insulating, ultra-miniature electromagnetic relay. [Background technology]

[0003] Due to their small volume, micro-miniature electromagnetic relays are widely used in fields requiring dense installation of products, such as network communication and medical equipment. The prior art micro-miniature electromagnetic relays usually consist of a movable spring armature part, a base part and a housing, where the movable spring armature part is formed as a whole by combining two sets of movable springs and armatures through injection molding, the two sets of movable springs respectively have normally open end contacts and normally closed end contacts, the movable spring armature part forms a warped plate structure by welding the material of the positioning point to the fixed spring part of the base part, so that the normally open end contacts and normally closed end contacts of the movable spring respectively correspond to the contacts of the normally open fixed spring and the contacts of the normally closed fixed spring, and the welding method may be a method such as laser welding or resistance welding.

[0004] The base part of such a micro-miniature electromagnetic relay usually consists of a coil part and a fixed spring part. When manufacturing the base part, first, a coil holder part (shown in FIG. 1) is formed by a first injection molding of a U-shaped core, the coil holder part 101 includes a coil holder 102 and a U-shaped core 103, the coil holder 102 includes flanges 104 located at both ends and a winding window 105 located between the two flanges 104, the middle part of the U-shaped core 103 is covered by the coil holder 102, both ends 106 of the U-shaped core 103 are placed on the two flanges 104 of the coil holder 102, and the pole surface 107 of the U-shaped core 103 that is to be matched with the armature of the movable spring armature part is exposed outside the coil holder 102, next, an enamel wire 108 is wound around the winding window 105 of the coil holder 102, and the coil part 109 is formed. First, the relay coil is formed (as shown in FIG. 2), then the fixed spring portion 200 and the coil portion 109 are aligned (as shown in FIG. 3), where the fixed spring portion 200 usually includes four contact fixing springs 201 (i.e., two normally open fixed springs and two normally closed fixed springs), each contact fixing spring 201 includes a contact portion 202 and a pull-out leg 203, and the contact portion 202 includes a fixed contact 204; since the operating method of such a relay coil usually needs to achieve both a monostable state and a magnetic holding standard, the magnetic path structure usually requires a permanent magnet 206 welded between both ends 106 of the U-shaped iron core 103 of the coil portion (as shown in FIG. 4); and finally, the fixed spring portion 200 and the coil portion 109 are formed into a base portion 205 by a second injection molding (as shown in FIG. 5).

[0005] Although this solution of combining the base, magnetic circuit, and fixed spring through injection molding can achieve the effects of reducing volume and improving insulation capacity, it still has the following disadvantages:

[0006] First, there is a lack of precision in the consistency of the positions of the contact portions 202 of the four contact fixing springs 201 in the X and Y directions, and as shown in Fig. 5, the X direction is the longitudinal direction of the relay (i.e., the longitudinal direction along the bottom wall of the U-shape of the iron core), and the Y direction is the width direction of the relay. This is because, in a conventional electromagnetic relay, as shown in Fig. 3, the positions of the contact portions 202 of the contact fixing springs 201 do not effectively limit the positions in the X and Y directions, resulting in variation in the contact positions and variation in the contact positions between the fixed contacts and the moving contacts. This variation is likely to lead to a lack of consistency in the contact resistance and electrical durability between output circuits, affecting the consistency of the product.

[0007] Secondly, the creepage distance M between the position of the contact part 202 and the enamel wire 108 of the coil 1 is usually a short position between the input and output circuits (as shown in FIG. 3), and its insulation performance tends to deteriorate with the use of the relay, affecting the degree of shielding between the input and output circuits. The reason is that the position of the contact part 202 and the coil are isolated by the base plastic after the base is bonded and injected, but the plastic of the coil holder and the plastic of the base are usually not exactly the same material, so there are differences in properties such as expansion coefficient and heat resistance between the materials, and the plastic of the base and the plastic of the coil are separately processed in a secondary process, and the coil holder is usually processed and molded first, and after the processing is completed, the plastic surface of the frame is inevitably affected by atmospheric factors such as air moisture, so the plastic of the frame of the coil holder on the microscopic level and the plastic of the base cannot be completely bonded tightly. The disadvantage of this intimate bond is further aggravated by the influence of environmental temperature, humidity changes, etc. during the use of the relay. Therefore, before the base is ejected, the position of the fixed spring contact portion 202 and the coil are directly exposed on the enameled wire, the current-carrying distance M1 between them is short, and the micro-slit between the plastic of the coil holder and the plastic of the base becomes a path for voltage breakdown.

[0008] Thirdly, the permanent magnet 206 and the iron core 103 are positioned by laser welding, and heat is suddenly generated at the spot position during the laser welding, which causes the metal at the spot position to melt and splash. Because the welding position is near the iron core pole face 107, welding slag caused by liquid metal sputtering is likely to accumulate on the iron core pole face 107, which causes the relay to fail to operate even when the coil is energized, or causes a functional failure in which the contacts cannot be reliably turned on. Summary of the Invention

[0009] The objective of the present disclosure is to overcome the shortcomings of the prior art and provide an ultra-small electromagnetic relay with highly reliable insulation. Through structural improvements, the position of the contact part of the fixed spring can be limited in two directions, and uncontrollable variations in the position of the contact part of the fixed spring when it is injection molded as a base can be avoided, thereby improving the consistency of the relay output circuit, while avoiding the contact part of the fixed spring being directly exposed on the enamel wire, increasing the creepage distance between the input and output circuits without increasing the external dimensions of the relay, reducing the dependency on the increase in creepage distance due to the plastic of the base, and avoiding the impact on the insulation effect due to changes in environmental temperature and humidity during use of the relay, and further improving the environmental resistance of the relay.

[0010] The technical solution of the present disclosure to solve the technical problem provides an ultra-small electromagnetic relay with high-reliability insulation, including a coil portion and a fixed spring, wherein the coil portion includes a coil holder, the coil holder includes two flanges, the two flanges are located at both ends of the coil holder, the fixed spring portion includes a fixed spring provided at at least one end of the coil holder, the fixed spring includes a contact portion including a fixed contact, the contact portion of the fixed spring is provided at a position of the flange close to the coil holder, and the flange of the coil holder has a first barrier and a second barrier protruding upward, respectively, for jointly positioning the contact portion of the fixed spring in two horizontal directions, and the first barrier and the second barrier prevent uncontrollable variation in the position of the contact portion of the fixed spring when it is attached.

[0011] According to some embodiments of the present disclosure, the relay further includes a plastic part, the plastic part being integrated with a coil portion and a fixed spring portion by injection molding, the coil portion, the fixed spring portion and the plastic part being the base portion of the relay, and the first barrier and the second barrier prevent uncontrollable variations in the position of the contact portion of the fixed spring when it is injection molded into the base portion.

[0012] According to some embodiments of the present disclosure, the coil portion further includes a U-shaped iron core and an enameled wire, the coil holder covers the U-shaped iron core by injection molding, both ends of the U-shaped iron core extend upwardly from the two flanges of the coil holder to expose both end faces, which are pole faces, of the U-shaped iron core outside the coil holder, the coil holder further has a winding window formed between the two flanges, and the enameled wire is wound around the winding window.

[0013] According to some embodiments of the present disclosure, a wall surface of the first barrier is provided along the width direction of the relay, and the first barrier provides insulation between the contact portion of the fixed spring and the enameled wire wound around a winding window of a coil holder in the longitudinal direction of the relay, and the first barrier is used to increase the current-carrying distance between the contact portion of the fixed spring and the enameled wire. According to some embodiments of the present disclosure, a wall surface of the second barrier is provided along the longitudinal direction of the relay, the second barrier is located between the contact portion of the fixed spring and the U-shaped iron core in the width direction of the relay, the second barrier and the first barrier form an L-shaped outline, the contact portion of the fixed spring is located within the L-shaped outline, and the root portions of the first barrier and the second barrier are located outside the outline of the wire winding region of the enameled wire.

[0014] According to some embodiments of the present disclosure, the first barrier and the second barrier are connected together.

[0015] According to some embodiments of the present disclosure, the first barrier and the second barrier are each provided with a first protruding block arranged vertically along a surface facing the contact portion of the fixed spring, and the first protruding blocks of the first barrier and the second barrier abut against the corresponding contact portion of the fixed spring to realize joint positioning relative to the contact portion of the fixed spring. According to some embodiments of the present disclosure, the top of the first protruding block is an inclined surface, the inclined surface of the first protruding block gradually slopes downward from the inside to the outside, and the outside of the first protruding block is a straight side.

[0016] According to some embodiments of the present disclosure, the height position of the top ends of the first barrier and the second barrier corresponding to the height direction of the relay is higher than the height position of the top end of the contact portion of the fixed spring corresponding to the height direction of the relay.

[0017] According to some embodiments of the present disclosure, the plastic part completely covers the first barrier and the second barrier, or the plastic part partially covers the first barrier and the second barrier, with the tops of the first barrier and the second barrier exposed from the plastic part.

[0018] According to some embodiments of the present disclosure, the coil portion further includes a permanent magnet attached between both ends of the U-shaped iron core, and the flange of the coil holder has the first barrier and the second barrier symmetrically arranged on both sides of a center line along the longitudinal direction of the relay, and a clamping opening for clamping the permanent magnet in the width direction of the relay is formed between the two second barriers arranged in the width direction, and a second protruding block arranged along the vertical direction is provided on the surface facing the permanent magnet of the two second barriers arranged in the width direction, and the permanent magnet is fixed to the coil holder by a tight fit between the second protruding block and the permanent magnet.

[0019] According to some embodiments of the present disclosure, the top of the second protruding block is an inclined surface, the inclined surface of the second protruding block gradually slopes downward from the inside to the outside, and the outside of the second protruding block is a straight side.

[0020] According to some embodiments of the present disclosure, the flange of the coil holder has a third protruding block protruding upward from a bottom surface corresponding to the clamping opening.

[0021] Compared with the prior art, the beneficial effects of the present disclosure are as follows: 1) In the present disclosure, a first barrier and a second barrier are respectively protruding upwards in a flange using a coil holder for jointly positioning the contact portion of the fixed spring in two horizontal directions. With such a configuration of the present disclosure, the first barrier and the second barrier can be used to limit the position of the contact portion of the fixed spring in two directions, which prevents uncontrollable variations in the position when the contact portion of the fixed spring is attached, particularly when the base portion is injection molded, and further improves the consistency of the relay output circuit.

[0022] 2) In the present disclosure, the wall surface of the first barrier is provided along the width direction of the relay, and the first barrier separates between the contact part of the fixed spring and the enameled wire wound around the winding window of the coil holder in the longitudinal direction of the relay, and the height position of the top ends of the first barrier and the second barrier corresponding to the height direction of the relay is higher than the height position of the top end of the contact part of the fixed spring corresponding to the height direction of the relay. Such a structure of the present disclosure can avoid the contact part of the fixed spring being directly exposed on the enameled wire, increase the creepage distance between the input and output circuits without increasing the external dimensions of the relay, reduce dependency on the increase in creepage distance due to the plastic of the base, and avoid the influence of the influence of changes in environmental temperature and humidity on the insulation effect during use of the relay, thereby improving the environmental resistance of the relay.

[0023] 3) In the present disclosure, in a flange using a coil holder, the first barrier and the second barrier are symmetrical on both sides of the center line along the longitudinal direction of the relay, and a clamping opening for clamping a permanent magnet in the width direction of the relay is formed between the two second barriers arranged along the width direction, and a second protruding block arranged along the vertical direction is provided on the surface of each of the two second barriers facing the permanent magnet, thereby fixing the permanent magnet to the coil holder by utilizing the interference fit between the two second protruding blocks and the permanent magnet. Such a configuration of the present disclosure can avoid the adverse effects of laser welding position determination between the permanent magnet and the iron core in the prior art. The present disclosure will be described in more detail below with reference to the accompanying drawings and examples, but the microminiature relay of the present disclosure is not limited to the examples. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a schematic diagram of a three-dimensional structure of a coil holder portion of an electromagnetic relay according to the prior art. [Diagram 2] FIG. 1 is a schematic diagram of a three-dimensional structure of a coil portion of an electromagnetic relay according to a conventional technology. [Diagram 3] FIG. 1 is a schematic diagram of a combination position of a coil portion and a fixed spring portion of an electromagnetic relay in the prior art. [Figure 4] FIG. 1 is a schematic diagram of a three-dimensional structure of a coil portion (including a permanent magnet) of an electromagnetic relay in the prior art. [Diagram 5] FIG. 1 is a schematic diagram of a three-dimensional structure of a base portion of an electromagnetic relay according to a conventional technology. [Figure 6] FIG. 1 is a schematic diagram of the decomposition of a three-dimensional structure in an embodiment of the present disclosure. [Figure 7] FIG. 1 is a schematic diagram of a three-dimensional structure in an embodiment of the present disclosure (not including the housing). [Figure 8] FIG. 2 is a schematic diagram of a three-dimensional structure of a base portion in an embodiment of the present disclosure. [Figure 9] 1 is a schematic diagram of a combination position of a coil portion (including a permanent magnet) and a fixed spring portion in an embodiment of the present disclosure. [Figure 10]FIG. 13 is a top view of a combination position of a coil portion (including a permanent magnet) and a fixed spring portion in an embodiment of the present disclosure. [Figure 11] 1 is a schematic diagram of a combination position of a coil portion (not including a permanent magnet) and a fixed spring portion in an embodiment of the present disclosure. [Figure 12] FIG. 13 is a top view of the combination position of a coil portion (not including a permanent magnet) and a fixed spring portion in an embodiment of the present disclosure. [Figure 13] 1 is a schematic diagram of a three-dimensional structure of a coil portion (including a permanent magnet) in an embodiment of the present disclosure. [Figure 14] FIG. 2 is a top view of a coil portion (including a permanent magnet) in an embodiment of the present disclosure. [Figure 15] FIG. 2 is a schematic diagram of the three-dimensional structure of a coil portion (not including a permanent magnet) in an embodiment of the present disclosure. [Figure 16] FIG. 2 is a top view of a coil portion (not including permanent magnets) in an embodiment of the present disclosure. [Figure 17] FIG. 2 is a schematic diagram of a three-dimensional structure of a coil holder portion in an embodiment of the present disclosure. [Figure 18] FIG. 13 is a top view of a portion of a coil holder in an embodiment of the present disclosure. [Figure 19] FIG. 2 is a schematic diagram of the three-dimensional structure of a U-shaped core in an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Working Example As shown in Figs. 6 to 19, the highly reliable insulating micro-electromagnetic relay of the present disclosure includes a housing 1, a movable spring armature section 2, and a base section 3 (Fig. 6), where the movable spring armature section 2 is formed as a whole by combination injection molding of two sets of movable springs and armatures, and the two sets of movable springs are provided with normally open end contacts and normally closed end contacts, respectively, the movable spring armature section 2 forms a warped plate structure by welding the material of the positioning portion to the fixed spring section in the base section 3, and the normally open end contacts and normally closed end contacts of the movable spring correspond to the contacts of the normally open fixed spring and the contacts of the normally closed fixed spring. The base portion 3 includes a coil portion 31, a fixed spring portion 32, and a plastic part 33, and the plastic part 33 is formed by integrally joining the coil portion 31 and the fixed spring portion 32 by injection molding (as shown in FIG. 8). Here, the plastic part 33 corresponds to a base. The coil portion 31 includes a U-shaped iron core 311, a coil holder 5 which covers the U-shaped iron core 311 by injection molding, and an enamel wire 4 (shown in FIGS. 15 and 16) wound around the coil holder 5. Here, the U-shaped iron core 311 and the coil holder 5 are The coil holder 5 includes flanges 51 at both ends and a winding window 52 for winding an enameled wire between the flanges. Ends 312 at both ends of the U-shaped iron core 311 extend upward from the two flanges 51 at both ends of the coil holder 5, respectively, thereby exposing both end faces, which are pole faces 313 of the U-shaped iron core 311, from the coil holder 5 (as shown in Figures 18 and 19). The fixed spring section 32 includes a plurality of fixed springs 6 provided at a normally open end and / or a normally closed end (as shown in Figure 9). The upper part of the fixed spring 6 is a contact part 62 including a fixed contact 61, and the lower part is a retractable leg 63. The contact part 62 of the fixed spring is located close to the flange 51 of the coil holder 5, and a first barrier 511 and a second barrier 512 are respectively provided protruding upwardly on the flange 51 of the coil holder 5 for jointly positioning the contact part 62 of the fixed spring 6 in two horizontal directions. The first barrier 511 and the second barrier 512 prevent uncontrollable variation in the position of the contact part 62 of the fixed spring 6 during injection molding of the base part 3.

[0026] In this disclosure, the limitations on the orientation of technical features such as up and down indicate the relative positional relationship between parts or structures within a part. For example, the upper and lower parts of the fixed spring 6 refer to the corresponding upper and lower features of the fixed spring 6 when the fixed spring 6 is placed in the coil holder 5 and the ends 312 at both ends of the U-shaped iron core 311 are facing upwards.

[0027] In this embodiment, the wall surface of the first barrier 51 is provided along the width direction of the relay, and the first barrier 51 provides insulation between the contact portion 62 of the fixed spring 6 and the enamel wire 4 wound around the winding window 52 of the coil holder in the longitudinal direction of the relay, thereby utilizing the first barrier 511 to increase the current-carrying distance between the contact portion 62 of the fixed spring 6 and the enamel wire 4. 11, the electric current distance between the contact portion 62 of the fixed spring 6 and the enamel wire 4 includes a first step S1 from the enamel wire 4 to the top end of the first barrier 511 along the outer surface of the first barrier 511, a second step S2 of the width of the top end of the first barrier 511, and a third step S3 from the top end of the first barrier 511 to the contact portion 62 of the fixed spring 6 along the inner surface of the first barrier 511, where the inner surface of the first barrier 511 refers to the surface of the first barrier 511 facing the contact portion 62 of the fixed spring 6, and the outer surface of the first barrier 511 refers to the surface of the first barrier 511 facing away from the contact portion 62 of the fixed spring 6. The longitudinal direction of the relay refers to the longitudinal direction of the U-shaped bottom wall of the U-shaped iron core 311, which is the X direction as shown in FIG. 8, the width direction of the relay is the Y direction, and the height direction of the relay is the Z direction.

[0028] In this embodiment, the wall surface of the second barrier 512 is provided in the longitudinal direction of the relay and is located between the contact portion 62 of the fixed spring 6 and the U-shaped iron core 311 in the width direction of the relay, the second barrier 512 and the first barrier 511 are surrounded by an L-shaped outline, the contact portion 62 of the fixed spring 6 is located within the L-shaped outline, and the root portions of the first barrier 511 and the second barrier 512 are located outside the outline of the winding region of the enameled wire 4. The first barrier 511 and the second barrier 512 of the present disclosure are located outside the winding window 52 of the coil holder in the Z direction as a whole and do not occupy the winding window 52. The contact portion 62 of the fixed spring 6 is located inside the L-shaped barrier and outside the winding window 52 of the coil holder in the X and Y directions, avoiding direct opposition to the coil enameled wire.

[0029] In this embodiment, the first barrier 511 and the second barrier 512 are integrally connected. Of course, the first barrier 511 and the second barrier 512 may have an L-shaped profile and may not be connected.

[0030] In this embodiment, the first barrier 511 and the second barrier 512 are each provided with a first protruding block 513 arranged along the vertical direction (i.e., Z direction) on the surface (i.e., inner surface) facing the contact portion 62 of the fixed spring 6, and the first protruding block 513 can abut against the corresponding contact portion 62 of the fixed spring 6 to realize joint positioning with respect to the contact portion 62 of the fixed spring 6. By providing the first protruding block 513 to limit the position of the fixed spring 6, the contact area can be reduced and the generation of plastic waste can be reduced.

[0031] In this embodiment, the top of the first protruding block 513 is an inclined surface 514 that gradually slopes downward from the inside to the outside, and the outside of the first protruding block 513 is a straight side. The inside of the first protruding block 513 refers to the side that is connected to the first barrier 511 or the second barrier 512, and the outside of the first protruding block 513 refers to the side that is not connected to the first barrier 511 or the second barrier 512. By making the top of the first protruding block 513 an inclined surface 514, it is possible to easily guide and arrange the contact portion 62 of the fixed spring 6, and by making the outside of the first protruding block 513 a straight side, it is possible to reduce the difficulty of machining accuracy.

[0032] In this embodiment, the height position where the top ends of the first barrier 511 and the second barrier 512 correspond to the height direction of the relay (i.e., the Z direction) is higher than the height position where the top end of the contact portion 62 of the fixed spring 6 corresponds to the height direction of the relay.

[0033] In this embodiment, the plastic part 33 partially covers the first barrier 511 and the second barrier 512, and the tops of the first barrier 511 and the second barrier 512 are exposed to the outside of the plastic part 33. Of course, the plastic part 33 can be designed to completely cover the first barrier 511 and the second barrier 512, if necessary.

[0034] The first barrier 511 and the second barrier 512 on the coil holder 5 may be partially exposed in the Z direction of the relay after being injection molded as the base part 3, and may be designed to be covered with the base plastic to ensure the miniaturization of the entire relay as much as possible, but to appropriately reduce the processing difficulty of the base mold. After the first barrier 511 and the second barrier 512 of the coil holder 5 are partially or completely covered by the plastic of the base part 3, the rigidity of the first barrier 511 and the second barrier 512 can be further improved, and the shape conformity of the relay can be improved in the change of the external conditions such as temperature shock, thereby improving the relay performance and improving the ability to prevent the change of the external environment.

[0035] In this embodiment, the coil portion 31 further includes a permanent magnet 7 attached between both ends 312 of a U-shaped iron core 311, and the flange 51 of the coil holder 5 has the first barrier 511 and the second barrier 512 symmetrically provided on both sides of a center line along the longitudinal direction of the relay, and a clamping opening 53 for clamping the permanent magnet 7 in the width direction of the relay is formed between the two second barriers 512 provided in the width direction. The surface of the barrier 512 facing the permanent magnet 7 is provided with a second protruding block 515 arranged along the vertical direction, and the second protruding block 515 of the two second barriers 512 of the same side flange 51 of the coil holder 5 is tightly fitted with the corresponding end of the permanent magnet 7 to fix the permanent magnet 7 to the coil holder 5, that is, both ends of the permanent magnet 7 are arranged by being tightly fitted into the second protruding block 515 of the four second barriers 512 of the two flanges 51 of the coil holder 5. In this embodiment, four sets of the first barrier 511 and the second barrier 512 are provided, and the number of the first barrier 511 and the second barrier 512 can be adjusted according to the relay output circuit, but it is necessary to maintain the fixed locking position of the permanent magnet. By providing the second protruding block 515 and fixing the permanent magnet 7 by tight fitting, the contact area can be reduced and the generation of plastic waste can be reduced.

[0036] In this embodiment, the top of the second protruding block 515 is an inclined surface 516 that gradually slopes downward from the inside to the outside, and the outside of the second protruding block 515 is a straight side. By making the top of the second protruding block 515 into an inclined surface 516, it becomes easier to guide and attach the permanent magnet 7, and by making the outside of the second protruding block 515 into a straight side, it becomes possible to reduce difficulties in terms of machining accuracy.

[0037] In this embodiment, a third protruding block 531 is further provided on the bottom surface of the flange 51 of the coil holder 5 corresponding to the clamping opening 53 to protrude upward. The third protruding block 531 serves to increase the creepage distance between the contact portion 62 of the fixed spring 6 and the enameled wire 4, and also serves to support the permanent magnet 7 so as not to crush and damage the enameled wire.

[0038] It should be noted that the permanent magnet 7 is not essential, for example in cases where the operation of the relay coil is in a single steady state.

[0039] In the highly reliable, insulated, ultra-compact electromagnetic relay of the present disclosure, a first barrier 511 and a second barrier 512 for jointly limiting the position of the contact portion 62 of the fixed spring 6 in two horizontal directions are provided to protrude upward from the flange 51 of the coil holder 5. With such a configuration of the present disclosure, the first barrier 511 and the second barrier 512 are utilized to limit the position of the contact portion 62 of the fixed spring 6 in two directions, thereby preventing uncontrollable variations in the position of the contact portion 62 of the fixed spring 6 when it is injection molded as the base portion 3, and improving the consistency of the relay output circuit.

[0040] In the highly reliable insulating ultra-small electromagnetic relay of the present disclosure, the wall surface of the first barrier 511 is provided along the width direction of the relay, the first barrier 511 separates between the contact portion 62 of the fixed spring 6 and the enamel wire 4 wound around the winding window 52 of the coil holder 5 in the longitudinal direction of the relay, and the height position of the top ends of the first barrier 511 and the second barrier 512 corresponding to the height direction of the relay is arranged higher than the height position of the top end of the contact portion 62 of the fixed spring 6 corresponding to the height direction of the relay. With such a configuration of the present disclosure, it is possible to avoid the contact portion 62 of the fixed spring 6 being directly exposed on the enamel wire 4, increase the creepage distance between the input and output circuits without increasing the external dimensions of the relay, reduce dependency on the increase in creepage distance due to the plastic of the base, and avoid the influence of the influence of changes in environmental temperature and humidity on the insulation effect during use of the relay, thereby improving the environmental resistance performance of the relay.

[0041] In the highly reliable insulating ultra-small electromagnetic relay of the present disclosure, the first barrier 511 and the second barrier 512 are symmetrically arranged on both sides of the center line along the longitudinal direction of the relay in the flange 51 of the coil holder 5, and a clamping opening 53 for clamping the permanent magnet 7 in the width direction of the relay is formed between the two second barriers 512 arranged along the width direction, and a second protruding block 515 arranged along the vertical direction is provided on the surface facing the permanent magnet of the two second barriers 512 arranged along the width direction, and the permanent magnet 7 is fixed to the coil holder 5 by the interference fit between the two second protruding blocks 515 and the permanent magnet 7. Such a configuration of the present disclosure can avoid the adverse effects of laser welding position determination between the permanent magnet and the iron core in the conventional technology. It avoids the generation of welding slag foreign matter, and at the same time reduces the number of processing steps, lowering the difficulty of manufacturing.

[0042] The above is only a preferred embodiment of the present disclosure, and is not a limitation of the present disclosure in any form. The present disclosure is disclosed in a preferred embodiment as described above, but is not used to limit the present disclosure. Any technician familiar with the art can make many possible variations and modifications to the technical scope of the present disclosure using the above disclosed technical content without departing from the technical scope of the present disclosure, or modify it into an equivalent embodiment. Therefore, any simple modifications, equivalent changes and modifications substantially made to the above embodiments based on the technology of the present disclosure that do not deviate from the technical proposal of the present disclosure should be within the scope of protection of the technical proposal of the present disclosure.

Claims

1. A highly reliable, insulating, ultra-compact electromagnetic relay including a coil portion and a fixed spring portion, the coil portion including a coil holder, the coil holder including two flanges, the two flanges being located at both ends of the coil holder, and the fixed spring portion including a fixed spring provided at at least one end of the coil holder, the fixed spring includes a contact portion including a fixed contact, the contact portion being provided at a position close to the flange of the coil holder, and a first barrier and a second barrier are respectively protruding upward from the flange for jointly positioning the contact portion of the fixed spring in two horizontal directions, the first barrier and the second barrier preventing uncontrollable variations in the position of the contact portion of the fixed spring when it is attached; The coil portion further includes an enameled wire, The first barrier separates the contact portion of the fixed spring and the enamel wire wound around the winding window of the coil holder in the longitudinal direction of the relay. This ultra-compact electromagnetic relay features highly reliable insulation.

2. The base portion of the relay includes a plastic part, the coil portion, and the fixed spring portion.

2. The highly reliable insulating ultra-miniature electromagnetic relay according to claim 1.

3. the coil portion further includes a U-shaped iron core, the coil holder covers the U-shaped iron core, both end portions of the U-shaped iron core extend upwardly from the two flanges of the coil holder to expose both end faces, which are pole faces, of the U-shaped iron core to the outside of the coil holder, the coil holder further has a winding window formed between the two flanges, and the enamel wire is wound in the winding window.

3. A highly reliable, insulating, ultra-miniature electromagnetic relay according to claim 2.

4. a wall surface of the first barrier is provided along a width direction of the relay, and the first barrier is utilized to increase a current-carrying distance between a contact portion of the fixed spring and the enamel wire.

4. The highly reliable insulating ultra-miniature electromagnetic relay according to claim 3.

5. a wall surface of the second barrier is provided along a longitudinal direction of the relay, the second barrier is located between a contact portion of the fixed spring and the U-shaped iron core in a width direction of the relay, the second barrier and the first barrier form an L-shaped outline, the contact portion of the fixed spring is located within the L-shaped outline, and base portions of the first barrier and the second barrier are located outside the outline of a wire winding region of the enameled wire.

5. A highly reliable, insulating, ultra-miniature electromagnetic relay according to claim 4.

6. the first barrier and the second barrier are connected together; 6. A highly reliable, insulating, ultra-miniature electromagnetic relay according to claim 5.

7. The first barrier and the second barrier are each provided with a first protruding block provided along a vertical direction on a surface facing the contact portion of the fixed spring, and the first protruding blocks of the first barrier and the second barrier abut against the corresponding contact portion of the fixed spring to realize a common positional limit with respect to the contact portion of the fixed spring.

7. A highly reliable, insulating, ultra-miniature electromagnetic relay according to claim 5 or 6.

8. The top of the first protruding block is an inclined surface, the inclined surface of the first protruding block is gradually inclined downward from the inside to the outside, and the outside of the first protruding block is a straight side.

8. A highly reliable insulating ultra-miniature electromagnetic relay according to claim 7.

9. a height position of the top ends of the first barrier and the second barrier in a height direction of the relay is higher than a height position of the top end of the contact portion of the fixed spring in the height direction of the relay; 7. A highly reliable, insulating, ultra-miniature electromagnetic relay according to claim 5 or 6.

10. The plastic part completely covers the first barrier and the second barrier, or the plastic part partially covers the first barrier and the second barrier, and the tops of the first barrier and the second barrier are exposed from the plastic part.

7. A highly reliable, insulating, ultra-miniature electromagnetic relay according to claim 5 or 6.

11. the coil portion further includes a permanent magnet attached between both ends of the U-shaped iron core, the flange of the coil holder has the first barrier and the second barrier symmetrically provided on both sides of a center line along the longitudinal direction of the relay, and a clamping opening for clamping the permanent magnet in the width direction of the relay is formed between the two second barriers provided in the width direction, and a second protruding block provided along the vertical direction is provided on a surface facing the permanent magnet of the two second barriers provided in the width direction, and the permanent magnet is fixed to the coil holder by a tight fit between the second protruding block and the permanent magnet, the top of the second protruding block is an inclined surface, the inclined surface of the second protruding block gradually inclines downward from the inside to the outside, and the outside of the second protruding block is a straight side, and a third protruding block is provided protruding upward from a bottom surface of the flange of the coil holder corresponding to the clamping opening.

7. A highly reliable, insulating, ultra-miniature electromagnetic relay according to claim 5 or 6.

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