A moving spring assembly of a relay and an electromagnetic relay

Abstract

The application discloses a dynamic spring assembly of a relay and an electromagnetic relay, and the dynamic spring assembly comprises at least two dynamic spring sheets, a dynamic spring leading sheet and a dynamic contact, the at least two dynamic spring sheets are stacked together, one end of the at least two dynamic spring sheets is fixedly connected with the dynamic spring leading sheet respectively, and the other end of the at least two dynamic spring sheets is fixedly connected with the dynamic contact respectively; the shape and the unfolded size of the at least two dynamic spring sheets are consistent or basically consistent. The application can share one blanking die when stamping and forming the at least two dynamic spring sheets, the thermal expansion coefficients of the dynamic spring sheets are consistent, the mechanical stress and the thermal stress are small, and therefore the action and release parameters of the relay are stable.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a dynamic spring assembly of a relay and an electromagnetic relay. Background Art

[0002] The dynamic spring assembly of conventional relays generally includes a dynamic spring, a dynamic contact, and a dynamic spring lead-out plate, with the dynamic contact and dynamic spring lead-out plate respectively disposed at each end of the dynamic spring. Some dynamic springs are single-piece, while others are double-piece, stacked. A single-piece dynamic spring has a steeper reaction force curve and a limited conductive cross-sectional area. For the same load, the current density per unit area increases, the temperature rise increases, and the electrical durability performance is significantly reduced. The double-piece dynamic spring stacking method effectively reduces the slope of the reaction force curve and increases the total conductive cross-sectional area of ​​the dynamic spring. For the same load, the current density per unit area decreases, the temperature rise decreases, and the electrical durability performance is significantly improved. Therefore, the double-piece dynamic spring stacking method offers superior performance compared to a single-piece dynamic spring. However, the method of superimposing two movable springs also has the following shortcomings: the two movable springs have different unfolded lengths and shapes, and different blanking dies are required during stamping. At the same time, under different temperature environments, the thermal expansion coefficients of the two movable springs are inconsistent, and there are thermal stress and mechanical stress defects, which lead to large changes in the action and release parameters at different temperatures. Summary of the Invention

[0003] In response to the technical problems existing in the prior art, the present invention provides a dynamic spring assembly of a relay and an electromagnetic relay, which changes the structure of the dynamic spring to improve the current carrying capacity while ensuring the consistency of the thermal expansion coefficient of the dynamic spring.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a dynamic spring assembly of a relay, including at least two dynamic spring leaves, a dynamic spring lead-out piece and a dynamic contact, the at least two dynamic spring leaves are superimposed together, and one end of the at least two dynamic spring leaves is respectively fixedly connected to the dynamic spring lead-out piece, and the other end of the at least two dynamic spring leaves is respectively fixedly connected to the dynamic contact; the at least two dynamic spring leaves have the same or substantially the same shape and expanded size.

[0005] Furthermore, the portion of the movable spring piece close to the movable spring lead-out piece is bent respectively, and a bending line is formed on the portion in its width direction, so that the portion of the movable spring piece between its other end and the bending line has a preset small angle with the horizontal plane.

[0006] Furthermore, the small angle is less than 10°.

[0007] Furthermore, each movable spring piece is provided with a bending portion at a position close to the movable contact, so that the movable spring piece forms a Z shape.

[0008] Furthermore, there are two movable springs, and the bent portions of the two movable springs are staggered in the length direction of the movable springs, so that the bent portions of the two movable springs form a parallelogram.

[0009] Furthermore, the offset displacement of the bent portions of the two movable springs is at least twice the thickness of the movable spring.

[0010] Furthermore, the movable spring lead-out piece is riveted and fixed to the at least two movable spring pieces, and the movable spring lead-out piece is riveted and fixed to the movable spring piece in contact with it by using at least one first riveted protrusion, and is riveted and fixed to each movable spring piece by using at least one second riveted protrusion; the remaining movable spring pieces are provided with a clearance hole for avoiding the first riveted protrusion.

[0011] Furthermore, the edge of one end of the movable spring lead-out piece in contact with the movable spring piece in contact with it is provided with an avoidance chamfer to avoid the movable spring piece; the two side surfaces of the movable spring lead-out piece opposite to each other in the length direction of the movable spring piece are respectively provided with barbs located in the width direction of the movable spring piece, and the directions of the barbs are consistent.

[0012] The present invention further provides an electromagnetic relay, comprising a base, a magnetic circuit portion and a static spring portion arranged on the base, and further comprising a dynamic spring assembly of the relay as described above in the present invention, wherein the dynamic spring assembly is mounted on the base and cooperates with the static spring portion, and the dynamic spring piece of the dynamic spring assembly is driven by a pushing block that is linked to the armature of the magnetic circuit portion.

[0013] Furthermore, the base is divided into two layers, the magnetic circuit part is placed on the upper layer of the base, and the dynamic spring assembly and the static spring part are arranged on the lower layer of the base; the pushing block is movably arranged on the base, and its upper end enters the upper space of the base and corresponds to the armature up and down, and its lower end enters the lower space of the base and corresponds to the dynamic spring sheet of the dynamic spring assembly up and down.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Since the shapes and expanded dimensions of the at least two movable springs are identical or substantially identical, the at least two movable springs can share a blanking die during stamping. In addition, the thermal expansion coefficients of the movable springs are consistent, and the mechanical and thermal stresses are small, thereby stabilizing the actuation and release parameters of the relay.

[0016] 2. The portion of each movable spring piece close to the movable spring lead-out piece is bent to form the bending line, and the portion of the movable spring piece between the other end and the bending line has a predetermined small angle with the horizontal plane. Therefore, the present invention can freely adjust the breaking force of the movable spring piece, achieving correction-free operation.

[0017] 3. Since each movable spring piece is provided with a bent portion at a position close to the movable contact, the movable spring piece forms a Z-shape, and the bent portions of the two movable spring pieces are staggered in the longitudinal direction of the movable spring piece, so that the bent portions of the two movable spring pieces form a parallelogram. Therefore, the present invention can utilize the unstable characteristics of the parallelogram to increase the flexibility of the movable spring piece, thereby achieving a reaction force curve slope of the two movable spring pieces with the same conductive area that is much smaller than the reaction force curve slope of a single movable spring piece.

[0018] 4. The movable spring lead-out piece is riveted and fixed to the movable spring piece in contact with it by at least one first riveting protrusion, and is riveted and fixed to each movable spring piece by at least one second riveting protrusion. The remaining movable spring pieces are provided with a clearance hole for avoiding the first riveting protrusion. When the movable spring lead-out piece of the present invention is riveted to the movable spring piece, the movable spring lead-out piece can be first riveted and fixed to the movable spring piece in contact with it to achieve the positioning of the movable spring piece, and then riveted and fixed to each movable spring piece. Therefore, the movable spring assembly of the present invention is easy to produce using automated equipment, which solves the problem of the movable spring assembly in the prior art that requires high positioning and riveting accuracy of each movable spring piece when using automated riveting, making it inconvenient to implement automated riveting and requiring manual riveting.

[0019] 5. The edge of the movable spring lead-out piece at one end in contact with the movable spring piece it contacts is provided with a relief chamfer. This relief chamfer can avoid the movable spring piece, preventing burrs on the edge of the movable spring lead-out piece from affecting the overlapping and mating of the movable spring piece with the movable spring piece. The movable spring lead-out piece is provided with barbs in the width direction of the movable spring piece on two opposite sides of the movable spring piece in the longitudinal direction. The barbs are oriented in the same direction, so that the barbs can be used to position the movable spring assembly of the present invention when it is side-mounted.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the dynamic spring assembly of a relay and the electromagnetic relay of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the three-dimensional structure of the dynamic spring assembly of the present invention;

[0022] Figure 2 is a front view of the dynamic spring assembly of the present invention;

[0023] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0024] Figure 4 yes Figure 2 An enlarged schematic diagram of part B;

[0025] Figure 5 yes Figure 2 Enlarged view of part C;

[0026] Figure 6 is a top view of the moving spring assembly of the present application;

[0027] Figure 7 is a bottom view of the moving spring assembly of the present application (embodiment in part);

[0028] Figure 8 is Figure 7 Enlarged view of part D;

[0029] Figure 9 is Figure 7 Enlarged view of part E;

[0030] Figure 10 is a comparison of the force curve of the moving spring assembly of the present application and a single moving spring assembly;

[0031] Figure 11 is a perspective view of the electromagnetic relay of the present application (without housing);

[0032] Figure 12 is a front view of the electromagnetic relay of the present application (without housing);

[0033] Figure 13 is a top view of the electromagnetic relay of the present application;

[0034] Figure 14 is an A-A sectional view of the electromagnetic relay of the present application;

[0035] Figure 15 is a B-B sectional view of the electromagnetic relay of the present application. DETAILED DESCRIPTION

[0036] Please refer to Figures 1-10 shown, a moving spring assembly of a relay of the present application, comprising at least two moving spring pieces 1, a moving spring lead-out piece 2 and a moving contact 3, the at least two moving spring pieces 1 are stacked together, and one end of the at least two moving spring pieces 1 are fixedly connected with the moving spring lead-out piece 2 respectively, the other end of the at least two moving spring pieces 1 are fixedly connected with the moving contact 3 respectively; the shape and the unfolded size of the at least two moving spring pieces 1 are consistent or substantially consistent. The number of the moving spring pieces 1 is specifically two, but is not limited to this. The substantially consistent means that there is a slight difference in shape / size, but it is not easy to be perceived by naked eyes and can be ignored. The unfolded size refers to the size of the moving spring piece in the flat state, which includes the length and / or width of the moving spring piece in the unfolded state.

[0037] In this embodiment, the two movable springs 1 are simultaneously bent at their locations near the movable spring lead-out piece 2, and a bending line 11 is formed at this location in the width direction, so that the portion of the movable spring 1 between its other end and the bending line 11 has a preset small angle α with the horizontal plane, as shown in FIG. Figure 2 、 Figure 3 As shown. The small angle α is less than 10°, specifically, the small angle α is 4° to 7°. This allows the present invention to freely adjust the breaking force of the dynamic spring 1, achieving calibration-free operation. Specifically, the larger the small angle α, the greater the breaking force of the dynamic spring 1, and the smaller the small angle α, the smaller the breaking force of the dynamic spring 1.

[0038] In this embodiment, each movable spring piece 1 is provided with a bent portion 12 near the movable contact 3, so that the movable spring piece 1 forms a Z shape. The bent portions 12 of the two movable spring pieces 1 are staggered in the longitudinal direction of the movable spring piece 1, so that the bent portions 12 of the two movable spring pieces 1 form a parallelogram 13, as shown in FIG. Figure 2 、 Figure 4 As shown. The offset displacement of the bent portions 12 of the two movable springs 1 is at least twice the thickness of the movable spring 1. Therefore, the offset displacement of the bent portions 12 of the two movable springs 1 is very small. Therefore, it can be considered that the shapes of the two movable springs 1 are basically the same, so that the thermal expansion coefficients of the two movable springs 1 are completely the same, the mechanical stress and thermal stress are small, and thus the operating and release voltage parameters of the relay are stable.

[0039] In this embodiment, the movable contact 3 is fixed to the two movable spring pieces 1 by riveting, and the movable spring lead piece 2 is also fixed to the two movable spring pieces 1 by riveting. Figure 1 、 Figure 6As shown, the dynamic spring lead-out piece 2 is specifically riveted to the dynamic spring piece in contact with it using at least one first riveted protrusion 211, and is riveted to each dynamic spring piece 1 using at least one second riveted protrusion 212. The remaining dynamic spring pieces 1 are provided with clearance holes 14 to allow for the first riveted protrusions 211 to pass through. The remaining dynamic spring pieces 1 are those other than the one in contact with the dynamic spring lead-out piece 2. In the two superimposed dynamic spring pieces 1 shown in the drawings of this embodiment, the one in contact with the dynamic spring lead-out piece 2 is the lower one, while the remaining dynamic spring pieces are the upper ones. There is specifically one first riveted protrusion 211, and it is integrally formed with the dynamic spring lead-out piece 2. There are at least two second riveted protrusions 212, specifically two, but not limited to these, and they are integrally formed with the dynamic spring lead-out piece 2. Of the two movable springs 1, one is provided with rivet holes corresponding one-to-one to the first rivet protrusions 211 and the second rivet protrusions 212, and the other movable spring, in addition to the said clearance holes 14, is further provided with rivet holes corresponding one-to-one to the second rivet protrusions 212. Therefore, when the movable spring lead-out piece 2 of the present invention is riveted to the movable spring piece 1, the movable spring lead-out piece 2 can be first riveted and fixed to the movable spring piece in contact with it (i.e., the said lower movable spring piece) to achieve the positioning of the movable spring piece and ensure the riveting expansion, riveting strength, and contact reliability, and then riveted and fixed to each movable spring lead-out piece. Thus, the movable spring assembly of the present invention can be automatically riveted, which solves the problem that the movable spring assembly of the prior art has high requirements for the positioning and riveting accuracy of each movable spring piece when using automatic riveting, which makes it inconvenient to achieve automatic riveting and often uses manual riveting. This is because, in the prior art, the two movable springs and the movable spring lead-out piece are fixed using a single riveting method. If automated riveting is used, the equipment needs to clamp and position both movable springs at once. Clamping both movable springs simultaneously can easily cause the two movable springs to rub against each other, making it difficult to effectively position them. This results in poor automated riveting results and may even affect the stability of the relay's operation and release voltage parameters. In particular, when the two movable springs have the aforementioned bending line 11 and misaligned bend 12, it is even more difficult to effectively position both movable springs simultaneously. Therefore, when automated equipment cannot effectively position the two movable springs simultaneously, the prior art can only use manual riveting. To this end, the present invention adopts a two-step riveting method: first, one of the movable spring leaves is riveted to the movable spring lead-out piece, and then the other movable spring leaf is superimposed on the one of the movable spring leaves and riveted to the movable spring lead-out piece. In this way, when riveting using automated equipment, there is no need to clamp and position the two movable spring leaves at the same time, so the above-mentioned problem will not occur, and the present invention can also be produced using automated equipment.

[0040] In this embodiment, Figure 2 、 Figure 5As shown, the edge of one end of the movable spring lead-out piece 2 that contacts the movable spring piece in contact with it is provided with an avoidance chamfer 213 to avoid the movable spring piece 1, thereby avoiding the presence of burrs on the edge of the end of the movable spring lead-out piece 2 and affecting the overlapping fit between the end of the movable spring lead-out piece 2 and the movable spring piece 1.

[0041] In this embodiment, Figure 1 、 Figure 7-Figure 9 As shown, the movable spring lead-out piece 2 is provided with a plurality of barbs 214 extending along the width of the movable spring piece 1 on two opposing sides of the movable spring piece 1 in the longitudinal direction. Each barb 214 is oriented in the same direction. Specifically, the movable spring lead-out piece 2 is provided with two barbs 214 on each of two opposing sides of the movable spring piece 1 in the longitudinal direction. This allows the barbs 214 to provide positioning when the movable spring assembly of the present invention is mounted sideways.

[0042] In this embodiment, the dynamic spring lead-out piece 2 includes a flat plate 21 and a dynamic spring pin 22 extending downward from the side of the flat plate 21 at one end facing away from the dynamic spring piece 1. The first riveted protrusion 211, the second riveted protrusion 212, the avoidance chamfer 213 and the barb 214 are respectively provided on the flat plate 21.

[0043] The present invention relates to a dynamic spring assembly for a relay. Since the two dynamic springs 1 have the same or substantially the same shape and expanded dimensions, they can be stamped using a common blanking die. Furthermore, the thermal expansion coefficients of the dynamic springs 1 are consistent, resulting in low mechanical and thermal stresses, thereby stabilizing the relay's operating and release parameters. The parallelogram 13 formed between the bent portions 12 of the two dynamic springs 1 increases the flexibility of the dynamic springs 1, thereby achieving a much smaller slope of the reaction force curve for the two dynamic springs 1 with the same conductive area than for a single dynamic spring 1. Figure 10 As shown in the figure, the horizontal axis represents the distance moved by the armature release bud (the armature release bud refers to a convex bud provided on one side of the armature for cooperating with the iron core of the magnetic circuit part), and the vertical axis represents the reaction force of the movable spring measured at the armature release bud position. Curve I is the reaction force curve of a single movable spring with a thickness of 0.17 mm, and curve II is the reaction force curve of two movable springs 1 (each with a thickness of 0.12 mm) of the present invention superimposed together.

[0044] In the production of a dynamic spring assembly for a relay according to the present invention, two pre-formed dynamic spring leaves 1 are first punched (riveting holes are punched out) and bent to obtain the bent portion 12. Then, one of the dynamic spring leaves is first riveted to the dynamic spring lead-out piece, and the other dynamic spring leaf is superimposed on the one of the dynamic spring leaves and riveted to the dynamic spring lead-out piece for a second time. Next, both dynamic spring leaves are simultaneously riveted to the dynamic contact. Finally, the bending line 11 is formed by a mold. Different bending inserts of the mold can be used to form different small bending angles α, thereby achieving different dynamic contact breaking forces and meeting the correction-free requirement.

[0045] The dynamic spring assembly of a relay of the present invention can be applied to electromagnetic relays, such as Figure 11-Figure 15 shown.

[0046] See Figures 1-15 As shown, an electromagnetic relay of the present invention includes a base 4, a housing 8, a magnetic circuit portion 5, and a static spring portion 6 disposed on the base 4, and also includes the movable spring assembly described above. The movable spring assembly is mounted on the base 4 and cooperates with the static spring portion 6. The movable spring piece 1 of the movable spring assembly is driven by a push block 7 that is linked to the armature 55 of the magnetic circuit portion 5. The housing 8 is connected to the base 4 and encloses the base 4, magnetic circuit portion 5, movable spring assembly, and static spring portion 6 within its housing cavity.

[0047] In this embodiment, the base 4 is divided into two layers, the magnetic circuit part 5 is placed on the upper layer of the base 4, and the dynamic spring assembly and the static spring part 6 are placed on the lower layer of the base 4. Figure 14 、 Figure 15 As shown, the magnetic circuit portion 5 includes a coil frame 51, an enameled wire 52 wound around the coil frame 51, an iron core 53 mounted in the coil frame 51, a yoke 54, an armature 55, and a compression spring. The yoke 54 is L-shaped, with its vertical side fixedly connected to one end of the iron core 53 and its horizontal side engaged below the coil frame 51. The armature 55 is roughly L-shaped, with its vertical side magnetically engaged with the other end of the iron core 53 and its horizontal side engaged below the horizontal side of the yoke 54. A compression spring 56 is connected to the horizontal side of the yoke 54, which presses against the horizontal side of the armature 55 to limit the armature 55. The push block 7 is movably mounted on the base 4, with its upper end entering the upper space of the base 4 and engaging vertically with the horizontal side of the armature 55. Its lower end enters the lower space of the base 4 and engages vertically with the movable spring piece 1 of the movable spring assembly. In other embodiments, the pushing block is directly fixed on the armature. Specifically, the pushing block is fixed on a horizontal side of the armature, and the two can be fixed by insert injection molding.

[0048] In this embodiment, the moving spring assembly is loaded into the lower space of the base 4 from one side of the base 4 in the width direction, the barb 214 on the moving spring lead-out piece 2 is along the side loading direction of the moving spring assembly, and is clamped to the base 4 when the moving spring assembly is side-loaded in place, thereby playing a positioning role on the moving spring assembly and preventing the moving spring assembly from being withdrawn.

[0049] The electromagnetic relay of the present application has the working principle that when the coil (i.e. the enameled wire 52) is energized, the vertical one side of the armature 55 is attracted by the iron core 53, the horizontal one side of the armature 55 swings downward to push the push block 7 to move downward, thereby driving the moving spring piece 1 downward, causing the moving spring piece 1 to deform, and promoting the moving contact 3 to attract the static contact 61 of the static spring part 6. When the coil is de-energized, the vertical one side of the armature 55 is released by the iron core 53, the moving spring piece 1 is reset by its own restoring force, the moving contact 3 is disconnected from the static contact 61, and the push block 7 is reset upward.

[0050] The structure, configuration, principle, etc. of the moving spring assembly of the electromagnetic relay of the present application are described in the foregoing description, and will not be repeated here.

[0051] The moving spring assembly of the relay and the electromagnetic relay of the present application are the same as the prior art or can be realized by using the prior art in the non-involved parts.

[0052] The above embodiments are only used to further illustrate the moving spring assembly of the relay and the electromagnetic relay of the present application, but the present application is not limited to the embodiments, and any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments all fall within the protection scope of the technical scheme of the present application.

Claims

1. A dynamic spring assembly for a relay, comprising at least two dynamic springs, a dynamic spring lead-out piece, and a dynamic contact, wherein the at least two dynamic springs are stacked together, one end of each of the at least two dynamic springs is fixedly connected to the dynamic spring lead-out piece, and the other end of each of the at least two dynamic springs is fixedly connected to the dynamic contact; characterized in that: The shapes and expanded sizes of the at least two movable springs are identical or substantially identical; Each movable spring piece is provided with a bending portion near the movable contact, so that the movable spring piece forms a Z shape; the bending portions of at least two movable spring pieces are staggered in the length direction of the movable spring piece, so that the bending portions form a parallelogram.

2. The dynamic spring assembly of the relay according to claim 1, characterized in that: The portion of the movable spring piece close to the movable spring lead-out piece is bent, and a bending line is formed at this portion in its width direction, so that the portion of the movable spring piece between its other end and the bending line has a preset small angle with the horizontal plane.

3. The dynamic spring assembly of the relay according to claim 2, characterized in that: The small angle is smaller than 10°.

4. The dynamic spring assembly of the relay according to claim 1, characterized in that: The number of the movable reeds is two.

5. The dynamic spring assembly of the relay according to claim 1, characterized in that: The offset displacement of the bent portions of the at least two movable springs is at least twice the thickness of the movable springs.

6. The dynamic spring assembly of the relay according to claim 1, characterized in that: The movable spring lead-out piece is riveted and fixed to the at least two movable spring pieces, and the movable spring lead-out piece is riveted and fixed to the movable spring piece in contact with it by using at least one first riveting protrusion, and is riveted and fixed to each movable spring piece by using at least one second riveting protrusion; the remaining movable spring pieces are provided with a clearance hole for avoiding the first riveting protrusion.

7. The dynamic spring assembly of the relay according to claim 1, characterized in that: The edge of one end of the movable spring lead-out piece in contact with the movable spring piece in contact with it is provided with an avoidance chamfer to avoid the movable spring piece; the two side surfaces of the movable spring lead-out piece opposite to each other in the length direction of the movable spring piece are respectively provided with barbs located in the width direction of the movable spring piece, and the directions of the barbs are consistent.

8. An electromagnetic relay comprising a base, a magnetic circuit portion, and a static spring portion disposed on the base, characterized in that: It also includes a dynamic spring assembly of the relay as described in any one of claims 1 to 7, wherein the dynamic spring assembly is installed on the base and cooperates with the static spring part, and the dynamic spring leaf of the dynamic spring assembly is driven by a pushing block linked to the armature of the magnetic circuit part.

9. The electromagnetic relay according to claim 8, characterized in that: The base is divided into two layers, the magnetic circuit part is placed on the upper layer of the base, and the dynamic spring assembly and the static spring part are arranged on the lower layer of the base; the pushing block is movably arranged on the base, and its upper end enters the upper space of the base and corresponds to the armature in the upper and lower parts, and its lower end enters the lower space of the base and corresponds to the dynamic spring sheet of the dynamic spring assembly in the upper and lower parts.

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