An impact-resistant electromagnetic relay

Abstract

The utility model discloses an anti -impact's electromagnetic relay, including shell and the relay main part of setting in the shell, and the relay main part includes coil support and moving spring armature component, and moving spring armature component includes the moving spring and armature that are connected together, and the armature is swingable setting, and cooperate at the axial one end of coil support, the inner wall of shell is equipped with the limit structure, and the limit structure is with armature and is in the clearance fit in first direction, and limit the displacement amount when armature is along first direction and is offset, to reduce the degree of moving spring and / or the dynamic contact of setting of moving spring twist, thereby avoid moving spring and / or the dynamic contact of setting of moving spring twist and occur interference, first direction and the swing direction of armature and the axial direction of coil support are perpendicular, the limit structure of the utility model effectively limited the movement of armature on the space structure, prevent the relay and be impacted in the process, and moving spring and / or dynamic contact with moving spring twist and appear the situation of asphyxia.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to an impact-resistant electromagnetic relay. Background Technology

[0002] Electromagnetic relays are widely used in automotive electronic control modules. Their housing, as the core protective structure, primarily serves to secure the relay body, isolate it from external contaminants or gases, and ensure the insulation safety of the internal circuitry. However, when a relay encounters a sudden external impact (such as bumps in a moving vehicle or vibrations from industrial equipment), the armature is prone to lateral displacement, and this displacement can be significant. This causes the part of the moving spring connected to the armature with the moving contact (usually a cantilever structure) to twist, resulting in the moving contact jamming with the stationary contact, leading to relay failure. Utility Model Content

[0003] This invention addresses the technical problems existing in the prior art by providing an impact-resistant electromagnetic relay. By optimizing the internal structure of the housing, it can significantly reduce the displacement of the armature when subjected to impact.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an impact-resistant electromagnetic relay, including a housing and a relay body disposed within the housing. The relay body includes a coil frame and a moving spring armature component. The moving spring armature component includes a moving spring and an armature connected together. The armature is oscillating and is fitted at one end of the axial direction of the coil frame. The inner wall of the housing is provided with a limiting structure. The limiting structure is clearance-fitted with the armature in a first direction and limits the displacement of the armature when it deviates in the first direction, so as to reduce the degree of torsion of the moving spring in the first direction, thereby avoiding interference between the moving spring and / or the moving contacts disposed on the moving spring. The first direction is perpendicular to the swing direction of the armature and the axial direction of the coil frame.

[0005] In a preferred embodiment, the limiting structure is provided on the inner walls of the two opposite sides of the housing in the first direction of the armature.

[0006] In a preferred embodiment, the limiting structure contacts one end of the coil frame along the axial direction of the coil frame to limit the coil frame in the axial direction.

[0007] In a preferred embodiment, the limiting structure is in surface contact with the coil frame.

[0008] In a preferred embodiment, the inner wall of the housing includes two first inner walls disposed opposite to each other along the first direction, and a second inner wall disposed between the two first inner walls and corresponding to one end of the coil frame in the axial direction, wherein the limiting structure is disposed on the first inner wall.

[0009] In a preferred embodiment, the limiting structure includes a limiting protrusion, or the limiting structure includes a plurality of limiting protrusions spaced apart along a second direction, the second direction being perpendicular to the first direction and the axial direction of the coil; the first direction is the width direction of the housing, and the second direction is the length direction of the housing.

[0010] In a preferred embodiment, the limiting protrusion is integrally injection molded with the outer shell; the limiting protrusion is elongated and extends along the axial direction of the coil frame; the limiting protrusion extends to the second inner wall.

[0011] In a preferred embodiment, the side of the limiting protrusion facing the armature is an outwardly convex curved surface, or the side of the limiting protrusion facing the armature is a plane, and the plane has rounded chamfers at both ends in a second direction perpendicular to the first direction and the axial direction of the coil frame.

[0012] In a preferred embodiment, the relay body further includes a yoke, which is assembled with the coil frame and the moving spring armature component in a snap-fit ​​structure; the moving spring is L-shaped, with one side connected to the yoke and the other side connected to the armature, and is provided with the moving contact; the limiting structure reduces the degree of torsion of the moving spring at the bend between its two sides by limiting the displacement of the armature when it shifts along the first direction; the relay body further includes a stationary spring, which is provided with a normally closed stationary contact, which is disposed opposite to the moving contact provided on the moving spring, and the normally closed stationary contact and the moving contact are distributed sequentially from one end to the other along the axial direction of the coil frame.

[0013] In a preferred embodiment, the distance between the limiting structure and the armature in the first direction is less than or equal to 0.5 mm.

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

[0015] 1. This utility model features a limiting structure on the inner wall of the outer casing. This limiting structure is clearance-fitted with the armature in the first direction and restricts the displacement of the armature when it deviates in the first direction. This reduces the degree of torsion of the moving spring, thereby preventing interference or jamming of the moving spring and / or the moving contacts on the moving spring. Therefore, the design of this limiting structure not only does not affect the normal movement of the armature but also provides a certain constraint on the armature in the first direction, limiting the displacement of the armature in the first direction. This reduces the degree of torsion of the moving spring cantilever, allowing the moving spring to recover its deformation under its own elasticity. This prevents excessive torsion of the moving spring cantilever during relay impact, which could lead to interference or jamming of the moving contacts, ensuring normal relay operation.

[0016] 2. As a preferred embodiment, the outer casing is provided with the limiting structure on the inner walls of the opposite sides of the armature in the first direction. This not only limits the armature on both sides in the first direction, but also strengthens the inner walls of the opposite sides of the outer casing in the first direction.

[0017] 3. As a preferred embodiment, the limiting structure contacts one end of the coil frame along the axial direction of the coil frame to limit the coil frame in the axial direction. This design improves the assembly reliability of the relay body within the housing and ensures precise alignment and stable fit of the components during installation and operation. In particular, the surface-to-surface contact between the limiting structure and the coil frame further enhances the assembly reliability of the coil frame.

[0018] 4. The limiting protrusion and the outer shell are integrally injection molded. In particular, the limiting protrusion is elongated and extends along the axial direction of the coil frame, so that the limiting protrusion acts as a reinforcing rib on the first inner wall of the outer shell. By using the "rib instead of thickness" method, the force on the outer shell is distributed by the support of the limiting protrusion, thereby improving the bending and deformation resistance of the first inner wall of the outer shell. At the same time, it can also solve the problem of side wall bending deformation caused by injection molding. In particular, the surface where the first inner wall is located is the large surface of the outer shell, which is more prone to bending deformation due to injection molding.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the impact-resistant electromagnetic relay of the present invention is not limited to the embodiments. Attached Figure Description

[0020] Figure 1 This is an exploded view of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the outer shell of this utility model;

[0022] Figure 3 This is a cross-sectional view of the outer casing of this utility model. Figure 1 ;

[0023] Figure 4 This is a cross-sectional view of the outer casing of this utility model. Figure 2 ;

[0024] Figure 5 This is a bottom view of the outer casing of this utility model;

[0025] Figure 6 This is the front view of this utility model;

[0026] Figure 7 yes Figure 6 AA section view;

[0027] Figure 8 This is a cross-sectional view of a prior art relay under AA.

[0028] Figure 9 This is a top view of the present invention;

[0029] Figure 10 yes Figure 9 BB section view;

[0030] Figure 11 yes Figure 9 CC section view;

[0031] Figure 12 This is a schematic diagram of the force distribution on the outer shell of this utility model;

[0032] Figure 13 This is a schematic diagram of the stress deformation of the shell in existing technology;

[0033] In the diagram, 1 is the outer casing; 11 is the limiting protrusion; 2 is the coil frame; 3 is the armature; 4 is the moving spring; 5 is the yoke; 6 is the stationary spring; 7 is the moving contact; 8 is the stationary contact; and 9 is the coil. Detailed Implementation

[0034] In this utility model, the terms "first," "second," and "third," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "inner," "outer," and "top / bottom" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is only for the convenience of describing this utility model, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Furthermore, in the description of this utility model, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0036] Please see Figures 1-13 As shown, this utility model discloses an impact-resistant electromagnetic relay, comprising a housing 1 and a relay body disposed inside the housing 1. The relay body mainly includes a coil frame 2 and a moving spring armature component. The moving spring armature component includes a moving spring 4 and an armature 3 connected together. The armature 3 is oscillating and located at one axial end of the coil frame 2. A limiting structure is provided on the inner wall of the housing 1. This limiting structure maintains a clearance fit with the armature 3 in a first direction and limits the displacement of the armature 3 along the first direction, thereby reducing the degree of torsion of the moving spring 4. Even if the moving spring 4 is torsioned, it can recover its deformation under its own elastic action, thus avoiding interference between the moving spring 4 and / or the moving contact 7 provided on the moving spring 4. The first direction is perpendicular to the swing direction of the armature 3 and the axial direction of the coil frame 2. In this embodiment, the first direction refers to the width direction of the housing 1, while the axial direction of the coil frame 2 is consistent with the height direction of the housing 1. Therefore, the coil frame 2 is vertically arranged, and one axial end of the coil frame 2 is designed to face upwards.

[0037] The relay body also includes a yoke 5, which is assembled with the coil frame 2 and the moving spring armature assembly in a snap-fit ​​structure. Specifically, the yoke 5 and the moving spring 4 are both L-shaped. One side of the yoke 5 is located outside the coil frame 2 and extends upwards. The armature 3 is located at the knife edge at one end of the yoke 5. The other side of the yoke 5 is located at the other end of the axial direction of the coil frame 2 and is fixed to the bottom end of the iron core passing through the shaft hole of the coil frame 2. The snap-fit ​​surface of the armature 3 is magnetically attracted to the top pole surface of the iron core. One side of the moving spring 4 is fixed to the outer side of one side of the yoke 5, and the other side of the moving spring 4 is fixed to the armature 3. The tail of the other side of the moving spring 4 forms a cantilever and is provided with a moving contact 7. The limiting structure can indirectly limit the degree of torsion of the moving spring 4 at the bend between its two sides by limiting the amount of displacement of the armature 3 along the first direction. This prevents the relay from being subjected to excessive torsion at the bend during the impact process, which could cause plastic deformation and result in the moving contact 7 and / or the part of the moving spring 4 with the moving contact 7 getting stuck or blocked.

[0038] The relay body also includes a stationary spring 6, which is mounted on one end of the coil frame 2 along the axial direction. The stationary spring 6 is provided with a normally closed stationary contact 8, which is arranged opposite to the moving contact 7 provided on the moving spring 4. The normally closed stationary contact 8 and the moving contact 7 are distributed sequentially from one end of the coil frame 2 along the axial direction to the other end, that is, the normally closed stationary contact 8 is located above the moving contact 7.

[0039] In a preferred embodiment, the outer casing 1 has the aforementioned limiting structure on each of its two inner walls facing opposite directions in the first direction of the armature 3. This design not only provides effective lateral restraint on both sides of the armature 3 in the first direction, thereby evenly limiting the offset of the armature 3, but also allows the inner walls on both sides of the outer casing 1 in the first direction to provide a certain structural reinforcement through the design of the limiting structure. In other embodiments, the outer casing has the aforementioned limiting structure only on the inner wall of one side of the armature in the first direction. In this case, the inner wall of the outer casing on the other side of the armature in the first direction has a clearance fit with the armature.

[0040] In a preferred embodiment, the limiting structure contacts one end of the coil frame 2 along the axial direction of the coil frame 2 to limit its movement in that direction. This design improves the assembly reliability of the relay body within the housing 1, ensuring precise alignment and stable fit of the components during installation and operation. Furthermore, the surface-to-surface contact between the limiting structure and the coil frame 2 further enhances the assembly reliability of the coil frame 2.

[0041] The inner wall of the outer casing 1 includes two first inner walls disposed opposite each other along a first direction, and a second inner wall integrally formed between the two first inner walls and corresponding to one axial end of the coil frame 2. In this embodiment, since the first direction is the width direction of the outer casing 1, the two first inner walls are its two opposing inner side walls, while the second inner wall is the inner top wall of the outer casing 1. It should be noted that the above structure is only an example and is not a limitation of this utility model. The two first inner walls are respectively provided with limiting structures, but are not limited thereto.

[0042] The limiting structure may include one limiting protrusion 11 or multiple limiting protrusions 11. If multiple limiting protrusions 11 are used, they are spaced apart along a second direction, which is perpendicular to the first direction and the axial direction of the coil 9. Specifically, the second direction refers to the length direction of the outer shell 1. Therefore, the outer shell 1 has multiple limiting protrusions 11 on its two large inner surfaces. The design of multiple limiting protrusions 11 has a dual advantage: on the one hand, it can more effectively limit the offset of the armature 3; on the other hand, the arrangement of multiple limiting protrusions 11 significantly strengthens the inner surface of the outer shell 1, improving the overall stability and reliability.

[0043] In a preferred embodiment, the limiting protrusion 11 is integrally injection molded with the outer shell 1 to ensure strength. This design improves the overall integrity and durability of the structure. Preferably, the limiting protrusion 11 is elongated and extends along the axial direction of the coil frame 2 (i.e., the height direction of the outer shell 1). This design not only better fixes the position of the coil frame 2 but also makes the limiting protrusion 11 act as a reinforcing rib on the first inner wall of the outer shell 1. Furthermore, the top of the limiting protrusion 11 is higher than the center of gravity of the armature 3 and extends upward to the second inner wall of the outer shell 1 (i.e., the inner top wall of the outer shell 1). This design not only ensures effective lateral restraint on the armature 3 but also helps to improve the structural reinforcement effect of the limiting protrusion 11 on the first inner wall of the outer shell 1.

[0044] like Figures 2-5 As shown, in this embodiment, one of the first inner walls of the outer casing 1 has three limiting protrusions 11, and the other first inner wall has two limiting protrusions 11, but this is not a limitation. The height h of each limiting protrusion 11 is consistent with the distance between the inner top surface of the outer casing 1 and the part of the coil frame 2 that contacts the limiting protrusion 11, ensuring reliable contact between the outer casing 1 and the coil frame 2. The thickness d of each limiting protrusion 11 is slightly greater than the distance L3 between the limiting protrusion 11 and the armature 3 in the first direction. The width of the limiting protrusion 11 has two specifications, with the width L1 of one limiting protrusion 11 being greater than the width L2 of the other limiting protrusion 11. Therefore, the limiting protrusion 11 has sufficient width and thickness to ensure stable and firm contact between the limiting protrusion 11 and the coil frame 2, thereby improving the reliability of the assembly.

[0045] Each limiting protrusion 11 facing the armature 3 can be either a convex curved surface or a flat surface. If it is a flat surface, then the two ends of the flat surface are respectively provided with rounded chamfers in a second direction (i.e., the length direction of the outer shell 1) that is perpendicular to the first direction and the axial direction of the coil frame 2. This design can reduce the generation of burrs, thereby reducing the friction caused by the armature 3 contacting burrs during movement, and also reducing the wear of the limiting protrusions 11. In this embodiment, the side of each limiting protrusion 11 facing the armature 3 is a flat surface with rounded chamfers as an example, but it is not limited to this.

[0046] like Figure 7 As shown, the distance L3 between the limiting structure (i.e., the limiting protrusion 11) and the armature 3 in the first direction is less than or equal to 0.5 mm, with a preferred value of 0.3 mm. This design neither interferes with the normal operation of the armature 3 nor restricts excessive offset. In contrast, in the prior art, the inner wall surface of the outer casing 1 does not have a limiting structure, and the distance L4 between the inner wall surface of the outer casing 1 and the armature 3 in the first direction is approximately 0.825 mm. Figure 8As shown, this results in a large gap between the inner wall of the outer casing 1 and the armature 3 in the first direction, which cannot form an effective lateral constraint on the armature 3. When the relay encounters a sudden impact (such as the bumps of a car or the vibration of industrial equipment), the armature 3 will shift along the first direction, causing the relative position accuracy of the moving contact 7 to decrease or even become stuck.

[0047] The specific reasons for the jamming of the moving contact 7 are as follows: The normally closed snap-action relay operates by swinging up and down. When the relay closes downwards, the electromagnetic force provided by the coil 9 drives the armature 3 downwards, and the moving spring 4 and the moving contact 7 move downwards accordingly. Conversely, during the return stroke, the reaction force provided by the bending angle of the moving spring 4 itself drives the armature 3 upwards. To ensure the overtravel of the contact, without the normally closed stationary spring 6, the moving spring 4 needs to have a large tilting angle, so that the moving contact 7 can move upwards without restriction.

[0048] Because the bend between the two sides of the moving spring 4 is narrow, it is prone to torsion. When the moving spring 4 torsions at its bend, the position of the moving contact 7 is no longer directly below the normally closed stationary contact 8, but rather deviates to one of the two sides of the stationary contact 8 in the first direction. Combined with the large upward tilt angle of the moving spring 4, the moving contact 7 has an upward force. Therefore, the moving contact 7 may form a lateral contact on the left or right side of the stationary contact 8. Because the moving spring 4 is in a torsional state and the moving contact 7 has an upward force, the lateral contact force between the moving contact 7 and the stationary contact 8 is very large, and the frictional force also increases accordingly, making it impossible to disengage, thus causing the moving contact 7 to become stuck.

[0049] Therefore, this utility model provides a limiting structure (i.e., limiting protrusion 11) on the inner wall surface of the outer shell 1, which restricts the movement of the armature 3 from a spatial structure perspective, thereby limiting the degree of torsion of the moving spring 4 at its bending point, and preventing the relay from being jammed due to the moving contact 7 and / or the part of the moving spring 4 with the moving contact 7 being torsiond by the moving spring 4 during the impact process.

[0050] This invention can also ensure the assembly reliability of the relay body and the housing 1: the limiting protrusion 11 limits the coil frame 2 in the axial direction of the coil frame 2, ensuring the precise alignment and stable cooperation of each component during installation and operation, thereby improving the assembly reliability of the relay body in the housing 1.

[0051] This invention provides limiting structures (i.e., multiple limiting protrusions 11) on the two large inner surfaces (i.e., the first inner wall) of the outer shell 1. The limiting protrusions 11 function as reinforcing ribs. By using ribs instead of thickness, the lateral and longitudinal support of the limiting protrusions 11 disperses the force on the outer shell 1, thereby improving the bending and deformation resistance of the outer shell 1. Figure 12As shown in the figure, the arrows indicate the direction of force distribution on the sidewall where the inner surface of the outer shell 1 is located.

[0052] If the large inner side of the outer shell 1 does not have a limiting structure, the strength of the sidewall containing the large inner side of the outer shell 1 will be low. This is because the existing outer shell 1, in pursuit of lightweighting and molding convenience, has a thin sidewall and no internal reinforcing structure. During injection molding, the sidewall is easily subjected to stress, causing concavity, especially in the large sidewall, where concavity is more common. Figure 13 As shown in the diagram, the arrows indicate the direction in which the large sidewall of housing 1 contracts or deforms under stress. In addition, during the transportation, installation, and use of the relay, the sidewall of housing 1 is inevitably subjected to external forces, such as collisions and compression. Due to the low strength and lack of reinforcing structure of the large sidewall, it is highly susceptible to localized deformation under these external forces.

[0053] The present invention relates to an impact-resistant electromagnetic relay. The parts not described herein are the same as or can be implemented using existing technologies.

[0054] The above embodiments are only used to further illustrate an impact-resistant electromagnetic relay of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An impact-resistant electromagnetic relay, comprising a housing and a relay body disposed within the housing, the relay body comprising a coil frame and a moving spring armature component, the moving spring armature component comprising a moving spring and an armature connected together, the armature being pivotally disposed and engaging with one axial end of the coil frame; characterized in that: The inner wall of the outer shell is provided with a limiting structure, which is in clearance fit with the armature in the first direction and limits the displacement of the armature when it deviates in the first direction, so as to reduce the degree of torsion of the moving spring and thus avoid interference between the moving spring and / or the moving contacts provided on the moving spring; the first direction is perpendicular to the swing direction of the armature and the axial direction of the coil frame.

2. The shock-resistant electromagnetic relay according to claim 1, characterized in that: The outer casing is provided with the limiting structure on the inner walls of the two opposite sides in the first direction of the armature.

3. The shock-resistant electromagnetic relay according to claim 1, characterized in that: The limiting structure contacts and engages with one end of the coil frame along the axial direction of the coil frame to limit the coil frame in the axial direction.

4. The shock-resistant electromagnetic relay according to claim 3, characterized in that: The limiting structure makes surface contact with the coil frame.

5. The shock-resistant electromagnetic relay according to any one of claims 1-4, characterized in that: The inner wall of the outer casing includes two first inner walls arranged opposite each other along the first direction, and a second inner wall disposed between the two first inner walls and corresponding to one end of the coil frame in the axial direction, and the limiting structure is disposed on the first inner wall.

6. The shock-resistant electromagnetic relay according to claim 5, characterized in that: The limiting structure includes a limiting protrusion, or the limiting structure includes multiple limiting protrusions, which are spaced apart along a second direction, the second direction being perpendicular to the first direction and the axial direction of the coil; the first direction is the width direction of the outer shell, and the second direction is the length direction of the outer shell.

7. The shock-resistant electromagnetic relay according to claim 6, characterized in that: The limiting protrusion is integrally injection molded with the outer shell; the limiting protrusion is elongated and extends along the axial direction of the coil frame; the limiting protrusion extends to the second inner wall.

8. The shock-resistant electromagnetic relay according to claim 6, characterized in that: The side of the limiting protrusion facing the armature is an outwardly convex curved surface, or the side of the limiting protrusion facing the armature is a plane, and the plane has rounded chamfers at both ends in a second direction that is perpendicular to the first direction and the axial direction of the coil frame.

9. The shock-resistant electromagnetic relay according to any one of claims 1-4, characterized in that: The relay body also includes a yoke, which is assembled with the coil frame and the moving spring armature component in a snap-fit ​​structure; the moving spring is L-shaped, with one side connected to the yoke and the other side connected to the armature, and is provided with the moving contact. The limiting structure reduces the degree of torsion of the moving spring at the bend between its two sides by limiting the displacement of the armature when it shifts along the first direction; the relay body also includes a stationary spring, which is provided with a normally closed stationary contact. The normally closed stationary contact is arranged opposite to the moving contact provided on the moving spring, and the normally closed stationary contact and the moving contact are distributed sequentially from one end to the other along the axial direction of the coil frame.

10. The shock-resistant electromagnetic relay according to claim 1, characterized in that: The distance between the limiting structure and the armature in the first direction is less than or equal to 0.5 mm.

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