A subminiature electromagnetic relay with high reliability and insulation

Abstract

The present invention discloses a highly reliable and insulated ultra-small electromagnetic relay, comprising a coil portion and a static spring portion; the coil portion comprises a coil frame; the coil frame comprises flanges at both ends; the static spring portion comprises static springs distributed at at least one end of the coil frame; the static spring comprises a contact portion containing a static contact; the contact portion of the static spring is disposed proximate to the flange of the coil frame; and the flange of the coil frame comprises a first retaining wall and a second retaining wall, each protruding upward, for jointly limiting the contact portion of the static spring in two horizontal directions. The present invention utilizes the cooperation of the first retaining wall and the second retaining wall to prevent uncontrollable positional deviation of the contact portion of the static spring during assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a highly reliable and insulated ultra-small electromagnetic relay. Background Art

[0002] Ultra-small electromagnetic relays, due to their compact size, are widely used in fields such as network communications and medical equipment, where dense product installation is required. Existing ultra-small electromagnetic relays typically consist of a movable spring-armature portion, a base portion, and a housing. The movable spring-armature portion is typically formed by combining two sets of movable springs and armatures through combined injection molding. Each set of movable springs has a normally open contact and a normally closed contact. The movable spring-armature portion is welded to the stationary spring portion of the base portion through the material at the positioning point to form a seesaw structure, so that the normally open and normally closed contacts of the movable spring correspond to the contacts of the normally open and normally closed stationary springs, respectively. Welding can be performed by laser welding or resistance welding, among other methods.

[0003] The base of this ultra-small electromagnetic relay is usually composed of a coil part and a static spring part. When the base part is made, the U-shaped iron core is first formed into a coil frame part (such as Figure 1 As shown in FIG, the coil frame portion 101 includes a coil frame 102 and a U-shaped iron core 103. The coil frame 102 includes flanges 104 at both ends and a winding window 105 in the middle. The middle section of the U-shaped iron core 103 is covered in the coil frame 102. The two ends 106 of the U-shaped iron core 103 are matched with the two flanges 104 of the coil frame 102 and are exposed outside the coil frame 102 as pole surfaces 107 that match the armature of the movable spring armature portion. Then, the enameled wire 108 is wound around the winding window 105 of the coil frame 102 to form a coil portion 109 (as shown in FIG). Figure 2 Then, the static spring portion 200 is matched with the coil portion 109 in position (as shown); Figure 3 As shown), the static spring portion 200 usually contains four contact static springs 201 (i.e., two normally open static springs and two normally closed static springs), each contact static spring 201 includes a contact portion 202 and a lead pin 203, and the contact portion 202 contains a static contact 204; since the working mode of this type of relay coil usually needs to be compatible with monostable and magnetic holding specifications, the magnetic circuit structure usually also needs to have a permanent magnet 206, which is welded between the two ends 106 of the U-shaped iron core 103 of the coil portion (as shown in FIG. Figure 4 Finally, the static spring portion 200 and the coil portion 109 are formed into a base portion 205 (as shown) by a second injection molding method. Figure 5 shown).

[0004] This solution of combining the base, magnetic circuit, and static spring into a combined injection molded component can reduce volume and improve insulation performance, but it still has the following drawbacks:

[0005] First, the position consistency accuracy of the contact parts 202 of the four contact static springs 201 in the X and Y directions is insufficient, such as Figure 5 As shown in FIG, the X direction is the length direction of the relay (i.e., the length direction along the U-shaped bottom of the core), and the Y direction is the width direction of the relay. This is because the electromagnetic relay of the prior art, such as Figure 3 As shown, the contact portion 202 of the static contact spring 201 is not effectively limited in the X and Y directions. This can cause deviations in the contact position, leading to deviations in the contact position between the static contact and the moving contact. This deviation can easily lead to insufficient consistency in contact resistance and electrical durability between output circuits, thus affecting product consistency.

[0006] Second, the creepage distance M1 between the contact portion 202 and the enameled wire 108 of the coil is usually the shorter distance between the input and output circuits (e.g. Figure 3 As shown, the insulation performance at this location tends to deteriorate with relay use, affecting the isolation between the input and output circuits. This is because: although the contact portion 202 is isolated from the coil by the base plastic after the base is assembled and injection-molded, the coil bobbin plastic and the base plastic are typically not made of the same material, resulting in differences in expansion rate, heat resistance, and other properties. Furthermore, since the base plastic and the coil plastic are processed separately, the coil bobbin is typically formed first. After processing, the surface of the bobbin plastic is inevitably affected by atmospheric factors such as air moisture and its cleanliness. Therefore, at a microscopic level, the coil bobbin plastic and the base plastic cannot achieve a completely tight bond. This lack of tight bonding is further exacerbated by changes in ambient temperature and humidity during relay use. Therefore, since the static spring contact portion 202 is directly exposed above the enameled wire before the base is injection-molded, the creepage distance M1 between the two is short, and the microscopic gap between the coil bobbin plastic and the base plastic becomes a path for voltage breakdown.

[0007] Third, permanent magnet 206 and core 103 are positioned using laser welding. During laser welding, heat is generated rapidly at the laser spot, causing the metal in that spot to melt and even splatter. Because the welding location is near core pole face 107, the slag generated by the molten metal splashes easily accumulates on that surface, potentially causing the relay to malfunction, resulting in the coil not operating when energized or the contacts not reliably closing. Summary of the Invention

[0008] The object of the present invention is to overcome the deficiencies of the prior art and provide a highly reliable and insulated ultra-small electromagnetic relay. Through structural improvements, on the one hand, the contact portion of the static spring can be limited in two directions, thereby avoiding uncontrollable position dispersion of the contact portion of the static spring when it is injection-molded into a base, thereby improving the consistency of the relay output circuit; on the other hand, the contact portion of the static spring can be prevented from being directly exposed above the enameled wire, thereby increasing the creepage distance between the input and output circuits without increasing the overall dimensions of the relay, reducing the reliance on the base plastic to increase the creepage distance, and also preventing the insulation effect from being affected by ambient temperature, moisture changes, etc. during use of the relay, thereby improving the environmental resistance of the relay.

[0009] The technical solution adopted by the present invention to solve its technical problems is: a highly reliable and insulated ultra-small electromagnetic relay, comprising a coil part and a static spring part; the coil part comprises a coil frame; the coil frame comprises flanges at both ends; the static spring part comprises static springs distributed at at least one end of the coil frame; the static spring comprises a contact part containing a static contact; the contact part of the static spring is arranged at a position close to the flange of the coil frame; a first retaining wall and a second retaining wall are respectively provided on the flange of the coil frame, protruding upward and used to jointly limit the contact part of the static spring in two horizontal directions, so that the cooperation of the first retaining wall and the second retaining wall can avoid uncontrollable dispersion of the position of the contact part of the static spring during assembly.

[0010] The relay also includes a plastic part that is formed by combining the coil part and the static spring part into an integral whole through injection molding, and utilizes the cooperation of the first retaining wall and the second retaining wall to prevent uncontrollable position deviation of the contact part of the static spring during injection molding of the base part.

[0011] The coil part also includes a U-shaped iron core and an enameled wire; the coil frame is injection-molded to encase the U-shaped iron core; the two end heads of the U-shaped iron core protrude upward from the flanges at the two ends of the coil frame so that the two end faces serving as pole surfaces are exposed outside the coil frame; the enameled wire is wound in a winding window formed between the two end flanges of the coil frame.

[0012] The wall surface of the first retaining wall is arranged along the width direction of the relay, and the first retaining wall is blocked between the contact part of the static spring and the enameled wire wound in the winding window of the coil frame in the length direction of the relay, so as to utilize the first retaining wall to increase the creepage distance between the contact part of the static spring and the enameled wire.

[0013] The wall surface of the second retaining wall is arranged along the length direction of the relay, and the second retaining wall is located between the contact part of the static spring and the U-shaped iron core in the width direction of the relay; the second retaining wall and the first retaining wall form an L-shaped outline, the contact part of the static spring is located within the L-shaped outline, and the roots of the first retaining wall and the second retaining wall are located outside the outline of the enameled wire winding area.

[0014] The first retaining wall and the second retaining wall are connected into one body.

[0015] In the first retaining wall and the second retaining wall, first protruding blocks distributed vertically are respectively provided on one side facing the contact part of the static spring. The first protruding blocks of the first retaining wall and the second retaining wall abut against the contact part of the corresponding static spring to achieve common limiting of the contact part of the static spring.

[0016] The top of the first protruding block is set as an inclined surface and gradually slopes downward from the inside to the outside, and the outer side of the first protruding block is set as a straight edge.

[0017] The top ends of the first retaining wall and the second retaining wall are higher in height than the top end of the contact portion of the static spring in the height direction corresponding to the relay.

[0018] The plastic component completely covers the first retaining wall and the second retaining wall; or, the plastic component partially covers the first retaining wall and the second retaining wall, and the tops of the first retaining wall and the second retaining wall are exposed outside the plastic component.

[0019] The coil portion also includes a permanent magnet installed between the two end ends of the U-shaped iron core; in the flange of the coil frame, the first retaining wall and the second retaining wall are symmetrically provided on both sides of the center line along the length direction of the relay; a clamping opening is formed between the two second retaining walls for clamping the permanent magnet in the width direction of the relay; the two second retaining walls are respectively provided with second protruding blocks distributed vertically on the side facing the permanent magnet, so that the second protruding blocks of the two second retaining walls can be used to achieve an interference fit with the permanent magnet, thereby fixing the permanent magnet in the coil frame.

[0020] The top of the second protruding block is configured as an inclined surface, and is gradually inclined downward from the inside to the outside, and the outer side of the second protruding block is configured as a straight edge.

[0021] In the flange of the coil frame, a third protruding block is provided on the bottom surface corresponding to the clamping opening and protrudes upward.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention utilizes a first retaining wall and a second retaining wall, each protruding upward from the flange of the coil bobbin, to jointly limit the contact portion of the static spring in two horizontal directions. This structure of the present invention utilizes the cooperation of the first and second retaining walls to limit the contact portion of the static spring in two directions, preventing uncontrolled positional variations of the static spring contact portion during assembly, especially when injection-molded into the base portion, thereby improving the consistency of the relay output circuit.

[0024] 2. The present invention employs a method in which the first retaining wall is arranged along the width of the relay, the first retaining wall is positioned between the contact portion of the static spring and the enameled wire wound in the winding window of the coil frame in the length direction of the relay, and the top ends of the first retaining wall and the second retaining wall are arranged at a height higher than the top end of the contact portion of the static spring in the height direction corresponding to the relay. This structure of the present invention prevents the contact portion of the static spring from being directly exposed above the enameled wire, increases the creepage distance between the input and output circuits without increasing the overall dimensions of the relay, reduces reliance on the base plastic to increase the creepage distance, and also prevents the insulation effect from being affected by changes in ambient temperature and moisture during use, thereby improving the environmental resistance of the relay.

[0025] 3. The present invention utilizes a first retaining wall and a second retaining wall symmetrically positioned on either side of the centerline of the relay's longitudinal direction within the flange of the coil bobbin. A clamping opening is formed between the two second retaining walls to hold the permanent magnet in the relay's width. The two second retaining walls are each provided with a second vertically extending protrusion on the side facing the permanent magnet. This interference fit between the two second protrusions and the permanent magnet secures the permanent magnet in the coil bobbin. This structure avoids the drawbacks of prior art methods of laser welding the permanent magnet to the core.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the ultra-small signal relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the coil frame part of the electromagnetic relay in the prior art;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the coil part of the electromagnetic relay in the prior art;

[0029] Figure 3 This is a schematic diagram of the matching position of the coil part and the static spring part of the electromagnetic relay in the prior art;

[0030] Figure 4 This is a schematic diagram of the three-dimensional structure of the coil portion (containing a permanent magnet) of an electromagnetic relay in the prior art;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the base portion of the electromagnetic relay in the prior art;

[0032] Figure 6 It is a schematic diagram of the exploded three-dimensional structure of an embodiment of the present invention;

[0033] Figure 7 Schematic diagram of the three-dimensional structure of an embodiment of the present invention (excluding the housing);

[0034] Figure 8 is a schematic diagram of the three-dimensional structure of the base portion of an embodiment of the present invention;

[0035] Figure 9 Schematic diagram of the matching position of the coil part (containing a permanent magnet) and the static spring part of an embodiment of the present invention;

[0036] Figure 10 1. It is a top view of the mating position of the coil portion (containing a permanent magnet) and the static spring portion of an embodiment of the present invention;

[0037] Figure 11 Schematic diagram of the matching position of the coil part (excluding the permanent magnet) and the static spring part of an embodiment of the present invention;

[0038] Figure 12 1. It is a top view of the mating position of the coil portion (excluding the permanent magnet) and the static spring portion of an embodiment of the present invention;

[0039] Figure 13 1 is a schematic diagram of the three-dimensional structure of the coil portion (including the permanent magnet) of an embodiment of the present invention;

[0040] Figure 14 is a top view of a coil portion (including a permanent magnet) of an embodiment of the present invention;

[0041] Figure 15 1 is a schematic diagram of the three-dimensional structure of the coil portion (excluding the permanent magnet) of an embodiment of the present invention;

[0042] Figure 16 is a top view of the coil portion (excluding the permanent magnet) of an embodiment of the present invention;

[0043] Figure 17 1 is a schematic diagram of the three-dimensional structure of the coil frame portion of an embodiment of the present invention;

[0044] Figure 18 is a top view of a coil bobbin portion of an embodiment of the present invention;

[0045] Figure 193D is a schematic diagram of the three-dimensional structure of a U-shaped iron core according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] Example

[0047] See also Figures 6 to 19 As shown, the present invention is a high-reliability insulation ultra-small electromagnetic relay, comprising a housing 1, a spring-loaded armature portion 2 and a base portion 3 (as shown in FIG. Figure 6 ), wherein the movable spring armature part is formed as a whole by combining two groups of movable springs and armatures through combined injection molding. The two groups of movable springs respectively have normally open end contacts and normally closed end contacts. The movable spring armature part 2 is welded to the static spring part in the base part 3 through the material at the positioning part to form a seesaw structure, so that the normally open end contact and the normally closed end contact of the movable spring correspond to the contacts of the normally open static spring and the normally closed static spring respectively; the base part 3 includes a coil part 31, a static spring part 32, and a plastic part 33 (such as) which combines the coil part 31 and the static spring part 32 into a whole by injection molding. Figure 8 As shown), wherein the plastic part 33 is equivalent to the base; the coil part 31 includes a U-shaped iron core 311, a coil frame 5 in which the U-shaped iron core 311 is covered by injection molding, and an enameled wire 4 (as shown) wound around the coil frame 5. Figure 15 、 Figure 16 As shown), the U-shaped iron core 311 and the coil frame 5 constitute a coil frame portion 50; the coil frame 5 includes flanges 51 at both ends and a winding window 52 between the flanges for winding the enameled wire; the end heads 312 of the U-shaped iron core 311 protrude upward from the flanges 51 at both ends of the coil frame 5 so that the end faces of the pole faces 313 are exposed outside the coil frame 5 (as shown in FIG. Figure 18 、 Figure 19 The static spring portion 32 includes a plurality of static springs 6 (such as Figure 11 As shown); the upper part of the static spring 6 is set as a contact part 62 containing a static contact 61, and the lower part is set as a lead-out pin 63; the contact part 62 of the static spring is arranged at a position close to the flange 51 of the coil frame 5; in the flange 51 of the coil frame 5, a first retaining wall 511 and a second retaining wall 512 are respectively protruded upward for jointly limiting the contact part of the static spring in two horizontal directions, so that the cooperation of the first retaining wall 511 and the second retaining wall 512 can be used to avoid uncontrollable position deviation of the contact part 62 of the static spring when the base part 3 is injection molded.

[0048] In the present invention, the definition of upper, lower and other directions in the technical features only indicates the relative positional relationship between components or structures in components. For example, the upper and lower parts of the static spring 6 refer to the upper and lower features corresponding to the static spring 6 when the static spring 6 is fitted into the coil frame 5 and the end heads 312 of the U-shaped iron core 311 are facing upwards.

[0049] In this embodiment, the wall surface of the first retaining wall 511 is arranged along the width direction of the relay. The first retaining wall 511 is located between the contact portion 62 of the static spring 6 and the enameled wire 4 wound in the winding window 52 of the coil frame in the length direction of the relay, so as to increase the creepage distance between the contact portion 62 of the static spring 6 and the enameled wire 4 by using the first retaining wall 511. Figure 11 As shown, the creepage distance between the contact portion 62 of the static spring 6 and the enameled wire 4 includes three sections. The first section S1 is from the enameled wire 4 along the outer side of the first retaining wall 511 to the top of the first retaining wall 511. The second section S2 is the width of the top of the first retaining wall 511. The third section S3 is from the top of the first retaining wall 511 along the inner side of the first retaining wall 511 to the contact portion 62 of the static spring 6. The inner side of the first retaining wall 511 refers to the side of the first retaining wall 511 facing the contact portion 62 of the static spring 6, and the outer side of the first retaining wall 511 refers to the side of the first retaining wall 511 facing away from the contact portion 62 of the static spring 6. In addition, the length direction of the relay refers to the length direction of the U-shaped bottom of the U-shaped core 311, as shown in FIG. Figure 8 The direction shown is the X direction, the width direction of the relay is the Y direction, and the height direction of the relay is the Z direction.

[0050] In this embodiment, the second retaining wall 512 extends along the length of the relay and is positioned between the static spring contact portion 62 and the U-shaped core 311 in the width direction of the relay. The second retaining wall 512 and the first retaining wall 511 form an L-shaped profile, with the static spring contact portion 62 located within the L-shaped profile. The bases of the first and second retaining walls 511, 512, lie outside the outline of the winding area for the enameled wire 4. The first and second retaining walls 511, 512 of the present invention are positioned entirely outside the coil bobbin winding window 52 in the Z direction, not occupying the winding window 52. The static spring contact portion 62 is located inside the L-shaped retaining wall and outside the coil bobbin winding window in the X and Y directions, avoiding direct contact with the coil enameled wire.

[0051] In this embodiment, the first retaining wall 511 and the second retaining wall 512 are connected as one body. Of course, the first retaining wall 511 and the second retaining wall 512 may also be L-shaped in outline, but not connected.

[0052] In this embodiment, the first retaining wall 511 and the second retaining wall 512 are each provided with a first protruding block 513 distributed vertically (i.e., in the Z direction) on a surface facing the contact portion 62 of the static spring 6 (i.e., the inner surface). The first protruding blocks 513 of the first retaining wall 511 and the second retaining wall 512 abut against the corresponding contact portion 62 of the static spring 6 to achieve a common position limit for the contact portion 62 of the static spring 6. By providing the first protruding block 513 to limit the position of the static spring 6, the contact area can be reduced, thereby reducing the generation of plastic chips.

[0053] In this embodiment, the top of the first protruding block 513 is configured as a sloped surface 514, which slopes gradually downward from the inside out. The outer side of the first protruding block 513 is configured as a straight edge. The inner side of the first protruding block 513 is the side connected to the first retaining wall 511 or the second retaining wall 512, while the outer side of the first protruding block 513 is the side not connected to the first retaining wall 511 or the second retaining wall 512. The sloped surface 514 at the top of the first protruding block 513 facilitates the correct positioning of the contact portion 62 of the static spring 6; the straight edge at the outer side of the first protruding block 513 reduces the difficulty of machining precision.

[0054] In this embodiment, the top of the first retaining wall 511 and the second retaining wall 512 are higher in height (i.e., Z direction) than the top of the contact portion 62 of the static spring 6 in the height direction corresponding to the relay.

[0055] In this embodiment, the plastic member 33 partially covers the first retaining wall 511 and the second retaining wall 512, and the tops of the first retaining wall 511 and the second retaining wall 512 are exposed outside the plastic member 33. Of course, as needed, the plastic member 33 can also be designed to completely cover the first retaining wall and the second retaining wall.

[0056] After the first and second retaining walls 511, 512 of the coil bobbin are combined and injection-molded to form the base, they are allowed to be partially exposed in the Z direction of the relay to minimize the overall miniaturization of the relay. However, they are sometimes designed to be covered by the base plastic to appropriately reduce the difficulty of base mold processing. After the first and second retaining walls 511, 512 of the coil bobbin are partially or fully covered by the base plastic, the rigidity of the retaining walls is further improved, improving the shape consistency of the relay under external conditions such as temperature shock, thereby enhancing the relay's ability to withstand external environmental changes.

[0057] In this embodiment, the coil portion 31 also includes a permanent magnet 7 installed between the two end ends 312 of the U-shaped iron core 311; in the flange 51 of the coil frame 5, the first retaining wall 511 and the second retaining wall 512 are symmetrically provided on both sides of the center line along the longitudinal direction of the relay; a clamp 53 for clamping the permanent magnet 7 in the width direction of the relay is formed between the two second retaining walls 512; the two second retaining walls 512 are respectively provided with a second protruding block 515 distributed vertically on the side facing the permanent magnet 7, so that the second protruding blocks 515 of the two second retaining walls 512 in the flange 51 on the same side of the coil frame 5 are interference fit with the corresponding ends of the permanent magnet 7, so that the permanent magnet 7 is fixed in the coil frame 5, that is, the two ends of the permanent magnet 7 are respectively interference fit in the second protruding blocks 515 of the four second retaining walls 512 of the two flanges 51 of the coil frame 5. This embodiment includes four sets of first retaining walls 511 and second retaining walls 512. The number of first retaining walls 511 and second retaining walls 512 can be adjusted based on the relay output circuit, but the clamping position of the permanent magnet must be retained. The second protruding block 515 provides an interference fit for the permanent magnet 7, reducing the contact area and thus reducing the generation of plastic chips.

[0058] In this embodiment, the top of the second protruding block 515 is configured as an inclined surface 516, which slopes gradually downward from the inside to the outside, while the outer side of the second protruding block 515 is configured as a straight edge. The inclined surface 516 of the top of the second protruding block 515 facilitates the correct installation of the permanent magnet 7, while the straight edge of the outer side of the second protruding block 515 reduces the difficulty of machining precision.

[0059] In this embodiment, a third protrusion 531 is provided on the flange 51 of the coil bobbin 5, extending upward from the bottom surface corresponding to the clamping opening 53. This third protrusion 531 increases the creepage distance between the contact portion 62 of the static spring 6 and the enameled wire, and also supports the permanent magnet to prevent damage to the enameled wire.

[0060] It is worth noting that the permanent magnet 7 is not necessary, for example, when the relay coil operates only in a monostable state.

[0061] The present invention employs a highly reliable, insulated, ultra-compact electromagnetic relay. A first retaining wall 511 and a second retaining wall 512, each protruding upward from the flange 51 of the coil bobbin 5, are provided to jointly limit the contact portion of the static spring 6 in two horizontal directions. This structure utilizes the cooperation of the first retaining wall 511 and the second retaining wall 512 to limit the contact portion 62 of the static spring 6 in two directions, preventing uncontrolled positional variations of the contact portion 62 of the static spring 6 during injection molding of the base portion 3, thereby improving the consistency of the relay output circuit.

[0062] The present invention discloses a highly reliable, insulated, ultra-small electromagnetic relay. The first retaining wall 511 is positioned along the width of the relay, with the first retaining wall 511 positioned between the contact portion 62 of the static spring 6 and the enameled wire 4 wound in the winding window 52 of the coil bobbin 5 in the longitudinal direction of the relay. Furthermore, the tops of the first retaining wall 511 and the second retaining wall 512 are positioned at a height corresponding to the height of the relay, higher than the top of the contact portion 62 of the static spring 6 in the height corresponding to the height of the relay. This structure of the present invention prevents the contact portion 62 of the static spring 6 from being directly exposed above the enameled wire 4, increases the creepage distance between the input and output circuits without increasing the relay's overall dimensions, reduces reliance on the base plastic for increased creepage distance, and prevents the insulation from being affected by changes in ambient temperature and moisture during use, thereby improving the relay's environmental resistance.

[0063] The present invention employs a highly reliable, insulated, ultra-small electromagnetic relay. A first retaining wall 511 and a second retaining wall 512 are symmetrically arranged on either side of the centerline of the relay's length within the flange 51 of the coil frame 5. A clamping opening 53 is formed between the two second retaining walls 512 to hold the permanent magnet 7 in the relay's width. The two second retaining walls 512 are each provided with a vertically distributed second protrusion 515 on the side facing the permanent magnet. This second protrusion 515 creates an interference fit with the permanent magnet 7, securing the permanent magnet 7 within the coil frame 5. This structure avoids the drawbacks of prior art methods of laser welding the permanent magnet and iron core. This not only prevents the generation of welding slag and foreign matter, but also reduces the number of processing steps and manufacturing complexity.

[0064] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A highly reliable and insulated ultra-small electromagnetic relay comprising a coil portion and a static spring portion; the coil portion comprising a coil frame; the coil frame comprising flanges at both ends; the static spring portion comprising static springs distributed at at least one end of the coil frame; characterized in that: The static spring includes a contact portion containing a static contact; the contact portion of the static spring is arranged at a position close to the flange of the coil frame; in the flange of the coil frame, a first retaining wall and a second retaining wall are respectively protruded upward for jointly limiting the contact portion of the static spring in two horizontal directions, so that the cooperation of the first retaining wall and the second retaining wall can avoid uncontrollable dispersion of the position of the contact portion of the static spring during assembly; the first retaining wall is blocked between the contact portion of the static spring and the enameled wire wound in the winding window of the coil frame in the length direction of the relay; in the first retaining wall and the second retaining wall, a first protruding block distributed vertically is respectively provided on a side facing the contact portion of the static spring, and the first protruding blocks of the first retaining wall and the second retaining wall abut against the corresponding contact portion of the static spring to achieve joint limiting of the contact portion of the static spring.

2. The ultra-small electromagnetic relay with high reliability and insulation according to claim 1, characterized in that: The relay also includes a plastic part that is formed by combining the coil part and the static spring part into an integral whole through injection molding, and utilizes the cooperation of the first retaining wall and the second retaining wall to prevent uncontrollable position deviation of the contact part of the static spring during injection molding of the base part.

3. The ultra-small electromagnetic relay with high reliability and insulation according to claim 2, characterized in that: The coil part also includes a U-shaped iron core and an enameled wire; the coil frame is injection-molded to encase the U-shaped iron core; the two end heads of the U-shaped iron core protrude upward from the flanges at the two ends of the coil frame so that the two end faces serving as pole surfaces are exposed outside the coil frame; the enameled wire is wound in a winding window formed between the two end flanges of the coil frame.

4. The ultra-small electromagnetic relay with high reliability and insulation according to claim 3, characterized in that: The wall surface of the first retaining wall is arranged along the width direction of the relay, so that the first retaining wall is used to increase the creepage distance between the contact part of the static spring and the enameled wire.

5. The ultra-small electromagnetic relay with high reliability and insulation according to claim 4, characterized in that: The wall surface of the second retaining wall is arranged along the length direction of the relay, and the second retaining wall is located between the contact part of the static spring and the U-shaped iron core in the width direction of the relay; the second retaining wall and the first retaining wall form an L-shaped outline, the contact part of the static spring is located within the L-shaped outline, and the roots of the first retaining wall and the second retaining wall are located outside the outline of the enameled wire winding area.

6. The ultra-small electromagnetic relay with high reliability and insulation according to claim 5, characterized in that: The first retaining wall and the second retaining wall are connected into one body.

7. The ultra-small electromagnetic relay with high reliability and insulation according to claim 1, characterized in that: The top of the first protruding block is set as an inclined surface and gradually slopes downward from the inside to the outside, and the outer side of the first protruding block is set as a straight edge.

8. The ultra-small electromagnetic relay with high reliability and insulation according to claim 5 or 6, characterized in that: The top ends of the first retaining wall and the second retaining wall are higher in height than the top end of the contact portion of the static spring in the height direction corresponding to the relay.

9. The ultra-small electromagnetic relay with high reliability and insulation according to claim 5 or 6, characterized in that: The plastic component completely covers the first retaining wall and the second retaining wall; or, the plastic component partially covers the first retaining wall and the second retaining wall, and the tops of the first retaining wall and the second retaining wall are exposed outside the plastic component.

10. The ultra-small electromagnetic relay with high reliability and insulation according to claim 5 or 6, characterized in that: The coil portion also includes a permanent magnet installed between the two end ends of the U-shaped iron core; in the flange of the coil frame, the first retaining wall and the second retaining wall are symmetrically provided on both sides of the center line along the length direction of the relay; a clamping opening is formed between the two second retaining walls for clamping the permanent magnet in the width direction of the relay; the two second retaining walls are respectively provided with second protruding blocks distributed vertically on the side facing the permanent magnet, so that the second protruding blocks of the two second retaining walls can be used to achieve an interference fit with the permanent magnet, thereby fixing the permanent magnet in the coil frame.

11. The ultra-small electromagnetic relay with high reliability and insulation according to claim 10, characterized in that: The top of the second protruding block is set as an inclined surface, and is gradually inclined downward from the inside to the outside. The outer side of the second protruding block is set as a straight edge. In the flange of the coil frame, a third protruding block is also provided on the bottom surface corresponding to the clamping opening.

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