An electromagnetic relay

Abstract

The application discloses an electromagnetic relay, which comprises a moving spring component, the moving spring component comprising a moving spring sheet and a moving contact, the moving spring sheet having a first surface and a second surface opposite to each other in the thickness direction of the moving spring sheet, and the moving contact being welded on the first surface of the moving spring sheet; the second surface of the part of the moving spring sheet where the moving contact is welded is provided with a reinforcing structure, the reinforcing structure being symmetrically distributed with respect to a center line of the moving contact, the center line being located in a preset direction of the moving spring sheet, and the preset direction being perpendicular to the direction where the rotation axis of the moving spring sheet is located; and the reinforcing structure is arranged so that the application can strengthen the ability of the moving spring sheet to resist bending in the preset direction without affecting the flatness of the first surface, inhibit the tendency of the moving contact to be warped along the preset direction during load switching, thereby ensuring the stability of the contact gap and improving the load switching ability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of relays, in particular to an electromagnetic relay. BACKGROUND

[0002] At present, the contact components of electromagnetic relays can be divided into two types according to the fixed connection mode of the contacts and the moving spring pieces, one is riveting fixed mode, and the other is welding fixed mode. The contact components of the welding fixed mode are superior to the contact components of the riveting fixed mode in cost and production efficiency. In terms of cost, the contacts of the contact components of the welding fixed mode use special-shaped wire materials, which can be cut to different lengths according to needs and can be generated in a length of several meters at one time, so the material utilization rate is high and the production efficiency is fast. The rivet contacts cannot control the length of the contacts at will as the wire materials do, and different sizes of rivet contacts need to be re-made, and the production efficiency is limited by the process of one rivet at a time, so the production efficiency is lower than that of the wire materials. The above reasons result in that the overall production cost of the rivet contacts is higher than that of the wire materials. In terms of production efficiency, the production efficiency using the welding process can reach 100 times / min, while the rivet contacts are limited by the contact feeding and pressure riveting, and the efficiency is generally 60 times / min. However, when the contact components are parts of electromagnetic relays, the moving spring components of the welding fixed mode are superior to the moving spring components of the riveting fixed mode. In the application process, the former will cause the contacts to bend and deform due to heat, thereby driving the moving spring to bend and deform. The latter has high strength due to the thickness of the contacts and the advantages of the pressure riveting process, so the contacts will not bend and deform due to heat during load switching, which ensures that the moving spring piece will not bend and deform. The principle of the bending and deformation of the moving spring components of the welding fixed mode is described below.

[0003] The moving spring piece not only plays a role of conducting electricity in the relay, but also provides a counterforce for the relay. The existence of the counterforce is to match the coil suction force, so as to realize the stable action and release of the relay. Based on the fact that the coil suction force of most relays is constrained by the coil power consumption, and the coil power consumption of the current relay is basically controlled below 0.45W, the coil suction force is also limited. Based on this reason, the thickness of the moving spring piece is generally controlled within 0.20mm.

[0004] The relay will produce arc when conducting and disconnecting the load during the switching process of large load, accompanied by a large amount of heat, which will cause the temperature of the moving contact to rise, and the contact surface will be in a molten state, and the strength of the internal material of the moving contact will also decrease due to high temperature, and the heat will also be transmitted to the moving spring leaf at the corresponding position of the moving contact through the moving contact. Due to the limitation of the thickness of the moving spring leaf, the heat dissipation capacity is limited, and plastic deformation will occur slowly under this condition. During the life test of frequent on-off load, the gradual superposition of the deformation will cause the head of the whole moving spring leaf to slowly down, thereby causing the contact gap to be reduced and the operating voltage to be increased. As the contact gap becomes smaller, it may become more difficult to break the larger load, and the erosion time of the contact will be longer, eventually leading to early failure of the relay. As shown in Figure 1 、 Figure 2 , a conventional set of normally open snap type relays are taken as an example for illustration, and the state is the state at the end of the load switching life test. The moving contact 1' has been bent due to the heat generated during the on and off of the load, and the deformation will drive the moving spring leaf 2' to deform together, and finally the moving spring leaf 2' will be divided by the fulcrum 3', and the outer part will be down, and the inner part will be up. The down of the outer part will cause the contact gap to be reduced, thereby affecting the ability of arc breaking, and in severe cases, it may not be able to reliably break the arc, eventually leading to bonding failure. The up of the inner part will cause the air gap between the armature 4' and the iron core 5' to increase, eventually causing the operating voltage to increase, and in severe cases, the relay may not operate.

[0005] As shown in Figure 3 、 Figure 4 , during the load on-off test process of the normally open end of the conventional set of conversion type snap relays, the moving spring leaf 6' has a normally closed moving contact 8' at the back of the normally open contact 7' position. The presence of the normally closed contact 8' can greatly enhance the strength of the moving spring leaf 8', thereby effectively slowing down the plastic deformation of the moving spring leaf 6' and preventing early failure. Compared with a set of conversion type relays, a set of normally open snap type relays or a set of normally closed snap type relays lack a normally closed contact or a normally open contact, which will cause the strength of the normally open or normally closed moving spring leaf to be much lower than that of a set of conversion type, and the above-mentioned failure mode will also occur. If a normally closed contact is welded on the moving spring leaf for strength, it will increase the cost, and at the same time, it will also occupy the available space of a set of normally open relays. SUMMARY

[0006] The present application is directed to the technical problems existing in the prior art, and provides an electromagnetic relay which prevents the moving spring leaf from bending and deforming by improving the structure of the moving spring leaf.

[0007] The technical scheme adopted by the present application to solve its technical problems is: an electromagnetic relay, comprising a moving spring component, the moving spring component comprising a moving spring leaf and a moving contact, the moving spring leaf having a first surface and a second surface opposite in the thickness direction of the moving spring leaf, and the moving contact being welded on the first surface of the moving spring leaf; the second surface of the part of the moving spring leaf where the moving contact is welded is provided with a reinforcing structure, the reinforcing structure being symmetrically distributed corresponding to a center line of the moving contact, the center line being located in a preset direction of the moving spring leaf, and the preset direction being perpendicular to the direction where the rotation axis of the moving spring leaf is located.

[0008] Further, the reinforcing structure comprises one or more reinforcing protrusions, at least one reinforcing protrusion being arranged along the preset direction, and / or at least two reinforcing protrusions being arranged along the preset direction.

[0009] Further, the reinforcing protrusion is in the shape of a long strip and extends along the preset direction; the size of the reinforcing protrusion in the preset direction is greater than or equal to the size of the moving contact in the preset direction.

[0010] Further, the reinforcing protrusion is punched or struck from the first surface of the moving spring leaf to the second surface in the thickness direction of the moving spring leaf, so that the part of the first surface of the moving spring leaf opposite to the reinforcing protrusion forms a recess, the recess constitutes a groove, and the local area of the groove is exposed to the moving contact, so that the air gap is formed between the moving contact and the groove and is connected to the outside.

[0011] Further, one or more grooves are arranged on the first surface of the moving spring leaf corresponding to the position of the moving contact, the local area of the groove is exposed to the moving contact, so that the air gap is formed between the moving contact and the groove and is connected to the outside.

[0012] Further, the groove is in the shape of a long strip and extends along the preset direction, and both ends of the groove in the length direction are exposed to the moving contact.

[0013] Further, the moving contact comprises a material layer and a soldering aid layer, the conductivity of the material layer is higher than that of the soldering aid layer, the material layer has a third surface and a fourth surface opposite in the thickness direction of the material layer, and the soldering aid layer is compounded on the third surface of the material layer and is attached to the first surface of the moving spring leaf.

[0014] Further, the surface of the soldering aid layer is provided with one or more welding ribs, the welding ribs are arranged along the preset direction; the welding ribs are welded to the first surface of the moving spring leaf; and the welding ribs are arranged staggered with the groove.

[0015] Further, within the range of the area where the soldering aid layer is located, the thickness of the soldering aid layer is less than the thickness of the material layer.

[0016] Further, the movable contact is centrally arranged on the movable spring along the preset direction.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. Since the second surface of the part where the movable spring is welded with the movable contact is provided with the reinforcing structure, the ability of the movable spring to resist bending in the preset direction can be strengthened without affecting the flatness of the first surface, and the tendency of the movable contact to warp in the preset direction under heat during load switching can be inhibited, thereby ensuring the stability of the contact gap and improving the load switching ability.

[0019] 2. The reinforcing structure comprises the one or more reinforcing protrusions, so that the reinforcing structure is simpler in structure and easier to process and form.

[0020] 3. The air gap is formed between the recess and the movable contact, so that heat dissipation can be enhanced, and heat is prevented from being directly transferred to the reinforcing protrusion during load switching, thereby avoiding the softening of the reinforcing protrusion due to high temperature and the resulting decrease in strength.

[0021] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the electromagnetic relay of the present application is not limited to the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a sectional view of a normally open snap-action relay of the prior art;

[0023] Figure 2 is a sectional view of a normally open snap-action relay of the prior art; Figure 1 is an enlarged schematic view of part A in FIG. 1;

[0024] Figure 3 is a structural schematic view of a switching snap-action relay of the prior art;

[0025] Figure 4 is a structural schematic view of a switching snap-action relay of the prior art; Figure 3 is an enlarged schematic view of part B in FIG. 2;

[0026] Figure 5 is a structural schematic view of the electromagnetic relay of the present application in embodiment one;

[0027] Figure 6 is an enlarged schematic view of part C in FIG. 3; Figure 5 is an enlarged schematic view of part C in FIG. 3;

[0028] Figure 7 is a bottom view of the movable spring part of the present application in embodiment one;

[0029] Figure 8 is a perspective structural schematic view of the movable spring part of the present application in embodiment one;

[0030] Figure 9 is a front view of the moving spring member of the present application of Example 1;

[0031] Figure 10 is a cross-sectional view of the E-E portion of Figure 9

[0032] Figure 11 is an enlarged view of the D portion of Figure 10

[0033] Figure 12 is an exploded view of the moving contact of the present application of Example 1;

[0034] Figure 13 is a front view of the moving contact of the present application of Example 1 in an exploded state;

[0035] Figure 14 is an enlarged view of the E portion of Figure 13

[0036] Figure 15 is a cross-sectional view of the moving contact of the present application of Example 1;

[0037] Figure 16 is a partial structural view of the moving spring member of the present application of Example 1;

[0038] Figure 17 is a view showing the warping direction of the moving contact of the present application of Example 1;

[0039] Figure 18 is a cross-sectional view of the electromagnetic relay of the present application of Example 1;

[0040] Figure 19 is an enlarged view of the E portion of Figure 18

[0041] Figure 20 is a cross-sectional view of another moving spring member of the present application of Example 2. DETAILED DESCRIPTION

[0042] Example 1

[0043] See Figures 5-19 ​​​​As shown, the electromagnetic relay of the present application comprises a magnetic circuit part, a contact part, etc., the magnetic circuit part comprises a vertical coil 60, a core 50, an armature 40, a yoke 70, etc., the contact part comprises a moving spring component and a static spring component 30, the magnetic circuit part is assembled with the moving spring component and the static spring component 30. The moving spring component comprises a moving spring sheet 10 and a moving contact 20, the moving spring sheet 10 has a first surface 11 and a second surface 12 opposite to each other in the thickness direction of the moving spring sheet 10, and the moving contact 20 is welded on the first surface 11 of the moving spring sheet 10; the second surface 12 of the part where the moving contact 20 is welded on the moving spring sheet 10 is provided with a reinforcing structure, the reinforcing structure is symmetrically distributed corresponding to a center line of the moving contact 20, and the center line is located in a preset direction of the moving spring sheet 10, and the preset direction is perpendicular to the direction where the rotation axis of the moving spring sheet 10 is located.

[0044] In the embodiment, the reinforcing structure comprises one or more reinforcing protrusions, at least one reinforcing protrusion is arranged along the preset direction, and / or at least two reinforcing protrusions are arranged along the preset direction. In the embodiment, the reinforcing protrusion 13 is in the shape of a long strip and extends along the preset direction, and the size of the reinforcing protrusion 13 in the preset direction is greater than or equal to the size of the moving contact 20 in the preset direction. The number of the reinforcing protrusions 13 is specifically one, and the reinforcing protrusion 13 is located on the projection of the center line on the second surface 12.

[0045] In the embodiment, the reinforcing protrusion 13 is formed by stamping or hitting the first surface of the moving spring sheet 10 in the direction from the first surface to the second surface of the moving spring sheet 10, so that the part of the first surface of the moving spring sheet 10 opposite to the reinforcing protrusion 13 forms a recess part, the recess part constitutes a groove 14, and the local area of the groove is exposed to the moving contact, so that the air gap 15 connected with the outside is formed between the moving contact and the groove. In other embodiments, one or more grooves are arranged on the first surface of the moving spring sheet corresponding to the position of the moving contact, the grooves are staggered with the reinforcing protrusions in the length or width direction of the moving spring sheet, and the local area of the groove is exposed to the moving contact, so that the air gap connected with the outside is formed between the moving contact and the groove.

[0046] In the embodiment, since the reinforcing protrusion 13 is in the shape of a long strip, the groove 14 is also in the shape of a long strip and extends along the preset direction, and the two ends of the groove 14 in the length direction are exposed to the moving contact 20.

[0047] In the embodiment, as shown in the figure, the reinforcing protrusion 13 is in the shape of a long strip and extends along the preset direction, and the size of the reinforcing protrusion 13 in the preset direction is greater than or equal to the size of the moving contact 20 in the preset direction. Figures 12-15As shown, the movable contact 20 comprises a conductive material layer 21 and a soldering layer 22, the conductive material layer 21 has higher conductivity than the soldering layer 22, and the thickness of the soldering layer 22 is less than that of the conductive material layer 21 in the area where the soldering layer 22 is located. The conductive material layer 21 has a third surface 211 and a fourth surface 212 opposite to each other in the thickness direction of the conductive material layer 21, and the soldering layer 22 is compounded on the third surface 211 of the conductive material layer 21 and adheres to the first surface 11. The soldering layer 22 is provided with one or more soldering ribs 223, the soldering ribs 223 are welded to the first surface 11 of the movable spring piece 10, and the soldering ribs 223 are arranged along the preset direction, but are not limited thereto. The soldering ribs 223 are arranged staggered with the grooves 13.

[0048] In the embodiment, the third surface 211 of the conductive material layer 21 is provided with one or more accommodation grooves 213, and the fourth surface 212 of the conductive material layer 21 is provided with a plating layer. The number of the soldering layer 22 is one or more, and the soldering layer 22 corresponds to the accommodation groove 213 one by one, the soldering layer 22 is embedded in the accommodation groove 213 and compounded with the conductive material layer 21. The soldering layer 22 has a fifth surface 221 and a sixth surface 222 opposite to each other in the thickness direction of the soldering layer 22, the fifth surface 221 is exposed to the third surface 211, and the fifth surface 221 is provided with the soldering rib 223, and the rest of the fifth surface 221 is flush with the third surface 211. The sixth surface 222 is a plane, but is not limited thereto, in other embodiments, the sixth surface is a curved surface, etc.

[0049] In the embodiment, the conductive material layer 21 and the soldering layer 22 are respectively in the shape of a long plate, and the length dimension of the soldering layer 22 is consistent with that of the conductive material layer 21; the plurality of accommodation grooves 213 are distributed along the width direction of the conductive material layer 21, and each accommodation groove 213 is in the shape of a long strip and is located in the length direction of the conductive material layer 21, and each accommodation groove 213 penetrates at both ends in the length direction thereof. The number of the soldering rib 223 on the soldering layer 22 is one, and the soldering rib 223 is located in the middle of the fifth surface 221 and is arranged along the length direction of the sixth surface 222. The center distance e of the two soldering ribs closest to the outside of the conductive material layer 21 is greater than or equal to 1 / 2d, and d is the width of the second surface of the conductive material layer 21.

[0050] In the embodiment, the two opposite sides of the soldering aid layer 22 in the width direction are respectively convex arc surfaces 224, and the shape and size of the accommodating groove 213 are matched with the shape and size of the soldering aid layer 22. The two opposite sides of the soldering aid layer 22 are respectively designed as the arc surfaces 224, so that the arc surfaces 224 can play a guiding role when the soldering aid layer 22 is put into the accommodating groove 213 of the material layer 21, thereby ensuring the consistency of the position and size of the soldering aid layer 22 after rolling and compounding. On the other hand, the design of the arc surfaces 224 can also increase the contact area between the soldering aid layer 22 and the material layer 21, thereby ensuring the reliable lamination of the soldering aid layer 22 and the material layer 21. The contact width of the soldering aid layer 22 and the material layer 21 is (a+b+c)*N, as shown in Figure 14 , a and c are respectively the width (i.e. the arc length of the arc surface 224) of the two sides (i.e. the two arc surfaces 224), b is the width of the sixth surface 222, and N is the number of the soldering aid layer 22. In the embodiment, the number of the soldering aid layer 22 is two, so N=2. (a+b+c)*2≥d / 2 can ensure the reliable lamination between the moving spring sheet 10 and the soldering aid layer 22, and d is the width of the fourth surface 212 of the material layer 21, as shown in Figure 13 , 14 . By adjusting the size of a, b and c, the compounding area between the soldering aid layer 22 and the material layer 21 can be ensured, thereby ensuring the lamination firmness between the two materials.

[0051] In the embodiment, the material of the material layer 21 is any one of pure Ag, Ag alloy, PdCu alloy and the like, and the material of the soldering aid layer 22 is any one of Cu, CuNi alloy, CuZn alloy, CuBe alloy, CuSnP alloy and the like.

[0052] In the embodiment, the number of the accommodating groove 213 and the soldering aid layer 22 is two, but is not limited thereto. In other embodiments, the number of the accommodating groove and the soldering aid layer is one or three, etc.

[0053] The preparation method of the movable contact 20 is as follows: the soldering layer 22 is placed into the accommodating groove 213 opened on the material layer 21, then a rolling mill is used to apply a strong pressure on the two materials, whether to combine with heat action can be selected according to the materials of the selected material layer 21 and the soldering layer 22, the arc surfaces 224 on both sides of the soldering layer 22 can not only guide the soldering layer 22 when being placed into the accommodating groove 213, but also make the arc surfaces 224 on both sides of the soldering layer 22 bear force uniformly during the pressing process; the contact surface of the soldering layer 22 and the material layer 21 will be plastically deformed during the pressing process, the surface metal layer will be extruded and broken, then the clean and activated metal atoms exposed will diffuse and contact with each other, when the atoms of the two metals reach the range of atomic bond attraction, a shared electron layer is formed, so that the two metals are firmly combined together.

[0054] The third surface 211 of the material layer 21 of the movable contact 20 is provided with the accommodating groove 213, and after the soldering layer 22 is embedded and combined in the accommodating groove 213, the proportion of the soldering layer 22 on the third surface 211 of the material layer 21 is small, the soldering layer 22 does not completely cover the third surface 211 of the material layer 21, and in the area range where the soldering layer 22 is located, the thickness of the soldering layer 22 is smaller than the thickness of the material layer 21, so that the proportion of the material layer 21 can be increased by greatly reducing the proportion of the soldering layer 22 on the third surface 211 of the material layer 21 under the premise of ensuring the same volume of the movable contact, so as to improve the conductivity of the whole movable contact, slow down the temperature rise of the movable contact, and improve the number of load switching without affecting the bonding force of the material layer 21 and the soldering layer 22 and the bonding force of the soldering layer 22 and the movable spring piece 10. In addition, the proportion of the soldering layer 22 is reduced, compared with the traditional movable contact, the heat loss and energy loss caused by the large volume of the soldering layer 22 in the resistance welding process can be reduced, so as to slow down the power consumption of the equipment in the resistance welding process, improve the energy utilization rate, and reduce the energy loss in the resistance welding process. The embedding structure of the accommodating groove 213 can improve the contact area of the soldering layer 22 and the material layer 21, so as to ensure the firmness between the soldering layer 22 and the material layer 21.

[0055] The welding rib 223 is arranged on the fifth surface 221 of the soldering layer 22, so that the contact between the welding rib 223 and the movable spring piece 10 is concentrated at one place when resistance welding is performed, so that a large current is concentrated at the place to flow, and then the heat generated by the large current is used to dissolve the metal around the contact point between the welding rib 223 and the movable spring piece 10, so as to realize the function of melting the two metal materials.

[0056] The movable contact 20 and the movable spring 10 are welded, and in this embodiment, resistance welding is used. When welding, the third surface 211 of the material layer 21 and the soldering layer 22 thereon are placed facing the first surface 11 of the movable spring 10, and then resistance welding is performed. A large current flows from the soldering ribs 223 of the soldering layer to the contact point of the movable spring 10, and then heat generated by the flow of the large current is used to dissolve the metal around the contact point of the soldering ribs 223 and the movable spring 10, so that the two metal materials are melted. The state after welding is shown in Figure 11 As can be clearly seen from the figure, the third surface 211 of the material layer 21 can be bonded to the movable spring 10 except for the part of the soldering layer 22 and the part corresponding to the air gap 15. This structure is beneficial to the heat dissipation capacity of the contact during load switching, because the conductivity of the material layer 21 is much greater than that of the soldering layer 22.

[0057] As shown in Figure 16 The preset direction is the X-axis direction in Figure 16 , and is also the length direction of the movable contact 20. The Y-axis direction is the width direction of the movable contact 20. The reinforcing convex part 13 can strengthen the ability of the movable spring 10 to resist bending in the X-axis direction without affecting the flatness of the first surface 11 of the movable spring 10, and can inhibit the tendency of the movable contact 20 to warp in the X-axis direction during load switching, so as to ensure the stability of the contact gap (the shortest distance between the movable and static contacts of the relay in the disconnected state) and improve the load switching capacity. After the movable contact 20 is welded to the movable spring 10, the air gap 15 exists between the groove 14 on the movable spring and the movable contact 20. This air gap 15 can strengthen heat dissipation and inhibit the direct transmission of heat to the reinforcing convex part 13 during load switching, so as to avoid the strength reduction of the reinforcing convex part 13 due to softening at high temperature. Figure 17 The problem of thermal warping of the movable contact 20 in the Y-axis direction (the warping direction is indicated by the arrow in

[0058] The electromagnetic relay of the present application is specifically a group of normally open snap-type relays, but is not limited thereto. In other embodiments, the present application is one or more groups of normally closed snap-type relays or one or more groups of normally open snap-type relays. Figure 18 , Figure 19 The state corresponding to the present application is the state at the end of the load switching life test, from Figure 18 , Figure 19As can be seen, after the reinforcing protrusions 13 are used to enhance the strength of the moving spring 10, the moving contact 20 does not have obvious bending deformation even after it is subjected to great heat generated by the on and off of the load, although the moving spring 10 still has slight deformation, for example Figure 19 the angle α is larger and the angle β is smaller than before the test, but compared with the conventional moving spring without the reinforcing protrusions and the corresponding moving contact, the bending deformation of the moving contact 20 of the present application is slight, which ensures that even if the other bending angles of the moving spring 10 are subjected to thermal deformation, the contact gap will not become smaller, thereby avoiding early failure. In addition, in the corresponding state Figure 18 , Figure 19 , the air gap change value L=L2-L0 between the armature 40 and the core 50 of the present application, wherein L2 is the size of the air gap between the armature 40 and the core 50 at the end of the load switching life test, as shown in Figure 18 ; L0 is the size of the air gap between the armature and the core before the load switching life test of the existing relay without reinforcing protrusions on the moving spring. The size of the air gap between the armature and the core after the load switching life test of the existing relay without reinforcing protrusions on the moving spring is L1, as shown in Figure 1 ; the air gap change value L' between the armature and the core of the existing relay without reinforcing protrusions on the moving spring before and after the load switching life test is L1-L0, L<L', thereby improving the problem of large change in operating voltage during load switching, and further avoiding early failure of the relay.

[0059] Example Two

[0060] The electromagnetic relay of the present application differs from the above-mentioned example one in that the number of reinforcing protrusions 13 is an even number and is divided into two groups, each group including at least one reinforcing protrusion 13, and the two groups of reinforcing protrusions 13 are located on opposite sides of the center line. Specifically, the number of reinforcing protrusions 13 is two, as shown in Figure 20 , but is not limited thereto. The two reinforcing protrusions 13 are also respectively punched or struck by the first surface 11 of the moving spring 10 in the direction of the second surface 12 along the thickness of the moving spring 10, so that the first surface 11 of the moving spring 10 forms two recesses, each of which respectively constitutes the groove 14, and the groove 14 and the moving contact 20 form an air gap 15 connected to the outside. The two reinforcing protrusions 13 are also respectively in the form of a long strip and are respectively located in the predetermined direction, so that the groove 14 is also in the form of a long strip, and the two ends of the groove 14 in the length direction are respectively exposed to the moving contact 20.

[0061] In this embodiment, the number of the soldering aid layer 22 is one and is centrally arranged on the third surface 211 of the material layer 21.

[0062] The electromagnetic relay of the present application is the same as the prior art in the non-involved parts, or can be realized by using the prior art.

[0063] The above embodiment is only used to further illustrate the electromagnetic relay of the present application, but the present application is not limited to the embodiment, and any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application all fall within the protection scope of the technical scheme of the present application.

Claims

1. An electromagnetic relay comprising a movable spring component, the movable spring component including a movable spring sheet and a movable contact, the movable spring sheet having a first surface and a second surface opposite to each other in its thickness direction, the movable contact being welded to the first surface of the movable spring sheet; characterized in that: The second surface of the portion of the movable spring where the movable contact is welded is provided with a reinforcing structure. The reinforcing structure is symmetrically distributed along a center line corresponding to the movable contact. The center line is located in a predetermined direction of the movable spring, and the predetermined direction is perpendicular to the direction of the rotation axis of the movable spring. The reinforcing structure includes one or more reinforcing protrusions. The reinforcing protrusions are formed by stamping or striking the first surface of the movable spring sheet along the thickness of the movable spring sheet towards the second surface, so that the portion of the first surface of the movable spring sheet opposite to the reinforcing protrusion forms a recess, which constitutes a groove. A local area of ​​the groove is exposed to the movable contact, so that an air gap is formed between the movable contact and the groove, which is connected to the outside.

2. The electromagnetic relay according to claim 1, characterized in that: At least one reinforcing protrusion extends along the preset direction, and / or at least two reinforcing protrusions are arranged along the preset direction.

3. The electromagnetic relay according to claim 2, characterized in that: The reinforcing protrusion is elongated and extends along the preset direction; the size of the reinforcing protrusion in the preset direction is greater than or equal to the size of the moving contact in the preset direction.

4. The electromagnetic relay according to claim 1, characterized in that: One or more grooves are provided on the first surface of the movable spring corresponding to the position of the movable contact. A partial area of ​​the groove is exposed to the movable contact, so that an air gap is formed between the movable contact and the groove, which is connected to the outside.

5. The electromagnetic relay according to claim 1 or 4, characterized in that: The groove is elongated and extends along the preset direction, with both ends of the groove exposed at the moving contact along its length.

6. The electromagnetic relay according to claim 1 or 4, characterized in that: The moving contact includes a conductive material layer and a flux layer. The conductivity of the material layer is higher than that of the flux layer. The material layer has a third surface and a fourth surface that are opposite to each other in its thickness direction. The flux layer is laminated to the third surface of the material layer and is attached to the first surface of the moving spring.

7. The electromagnetic relay according to claim 6, characterized in that: The surface of the flux layer is provided with one or more weld beads, which are arranged along the preset direction; the weld beads are welded to the first surface of the movable spring; the weld beads are staggered from the groove.

8. The electromagnetic relay according to claim 6, characterized in that: Within the area where the flux layer is located, the thickness of the flux layer is less than the thickness of the material layer.

9. The electromagnetic relay according to claim 1, characterized in that: The moving contact is centered on the moving spring along the preset direction.

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