A noise reduction and sound-absorbing electromagnetic relay

Abstract

This invention discloses a noise-reducing and sound-absorbing electromagnetic relay, comprising an armature mounted on a coil frame and used for contacting an iron core. A flexible plug is connected to the periphery of the area of ​​the armature used for contacting the iron core. The extension length of the flexible plug is greater than the height of the mating gap between the armature and the coil frame when in the closed position. A recessed cavity is formed in the area of ​​the coil frame corresponding to the flexible plug on the armature. The depth of the recessed cavity is at least equal to the portion of the extension length of the flexible plug greater than the height of the mating gap between the armature and the coil frame. During the armature's engagement, the flexible plug contacts and collides with the armature before the armature itself. The impacted flexible plug bends and deforms during the armature's engagement and enters the recessed cavity. This invention reliably eliminates armature engagement noise through the collision buffering effect of the flexible plug, resulting in good noise reduction and sound absorption. The recessed cavity's containment of the flexible plug effectively prevents the flexible plug from compressing and storing energy between the armature and the coil frame, eliminating the release reaction force exerted by the flexible plug on the armature, thus ensuring high reliability.

Description

Technical Field

[0001] This invention relates to electromagnetic relays, specifically an electromagnetic relay capable of achieving noise reduction and silencing functions. Background Technology

[0002] An electromagnetic relay uses the electromagnetic attraction generated by magnetic flux and the bending force of the moving spring assembly to cause the armature on the coil frame to flip and engage / disengage on the iron core, thereby achieving contact control between the moving spring assembly and the stationary spring assembly. Since the armature and the iron core are both formed from conductive, hard metal parts, the armature, under the action of electromagnetic attraction, engages with the iron core in a rapid, striking manner during the flipping process (i.e., striking). This generates significant metal-to-metal contact noise between the armature and the iron core.

[0003] To meet the needs of industrial applications, some electromagnetic relays require noise reduction and silencing design, thus forming noise-reducing and silencing electromagnetic relays.

[0004] Currently, the elimination (or reduction, the same below; complete noiselessness is difficult to achieve) of the noise generated by the engagement between the armature and the core of an electromagnetic relay is mainly achieved through a buffer structure consisting of a spring (such as a spring plate) or a rubber pad on the coil frame, where the armature acts on the coil. The specific implementation process is as follows:

[0005] -Use the armature or coil frame as the load base, and set the buffer structure on the periphery of the area where the iron core is located;

[0006] - The armature that flips and engages first acts on the coil frame through the buffer structure, unloading most of the impact force of the engagement and flipping, reducing the engagement and flipping speed at the end of the engagement stroke, and slowly engaging on the iron core.

[0007] - After the armature is attracted to the iron core, the buffer structure is in a compressed energy storage state between the armature and the coil frame.

[0008] The aforementioned noise reduction structure can be found in Chinese patent documents such as "Silent Electromagnetic Relay" (Publication No. CN 101136291 A, Publication Date March 5, 2008) and "An Electromagnetic Relay with Noise Reduction" (Publication No. CN 110459437 A, Publication Date November 15, 2019). The main technical problem with this type of technology is that the buffer structure remains in a compressed, energy-storing state after the armature is fully engaged. Therefore, the electromagnetic attraction needs to overcome the sum of the elastic force of the moving spring assembly acting on the armature and the reaction force of the buffer structure acting on the armature to ensure stable engagement of the armature on the iron core. Furthermore, when the electromagnetic attraction force generated by the magnetic flux decreases and the armature needs to be released from the iron core, due to the elastic force of the moving spring assembly acting on the armature and the reaction force of the buffer structure acting on the armature, the armature will exhibit a significant premature release during the release process. Therefore, the technical problem derived from the aforementioned noise reduction structure is:

[0009] 1. The electromagnetic relay needs to generate a large magnetic flux attraction force;

[0010] 2. After the armature is attracted to the iron core, the overall release reaction force is too large, which leads to a significant reduction in the attraction and holding force. As a result, the armature will exhibit a significant premature release phenomenon during the release process.

[0011] Therefore, the aforementioned noise reduction structure directly affects the design performance of electromagnetic relays, increases the design difficulty, and is also detrimental to the miniaturization of electromagnetic relays. Summary of the Invention

[0012] The technical objective of this invention is to address the technical requirements of silent electromagnetic relays and the shortcomings of existing technologies by providing a noise-reducing and noise-silencing electromagnetic relay that has good noise reduction and noise reduction effects and high reliability without affecting the design performance of the electromagnetic relay.

[0013] The technical objective of this invention is achieved through the following technical solution: a noise-reducing and sound-absorbing electromagnetic relay, comprising an armature mounted on a coil frame, wherein the armature serves as a contact with the iron core on the coil frame during the attraction process;

[0014] The armature is connected to a flexible plug extending from the inner surface of the area where it contacts the iron core.

[0015] The length of the flexible plug extending from the inner surface of the armature is greater than the height of the mating gap between the armature and the coil frame in the area where the flexible plug is located after the armature is attracted into place on the iron core.

[0016] The coil frame is used to have a recessed cavity formed in the area corresponding to the flexible plug on the armature.

[0017] The depth of the clearance cavity is at least equal to the portion of the flexible plug's extension length that is greater than the height of the mating gap between the armature and the coil frame;

[0018] During the attraction of the armature to the coil frame, the contact and collision of the flexible plug on the coil frame precedes the attraction and collision of the armature to the iron core; the flexible plug that is collided with the armature bends and deforms and enters the relief cavity during the attraction of the armature.

[0019] The above technical measures address the unique characteristic of noise generated by the metal-to-metal contact and collision of the armature on the iron core during the attraction of the electromagnetic relay. A flexible plug with a specific structure is connected to the area where the armature avoids contact with the iron core, and a clearance cavity is formed in the corresponding part of the coil frame to allow the flexible plug to pass through. This ensures proper armature engagement during the attraction process.

[0020] - The negligible low-noise contact collision between the flexible plug and the coil frame unloads most of the impact force of the pull-in and flipping, reduces the flipping impact speed of the armature pull-in tail stroke, and allows the armature to slowly pull in onto the iron core, eliminating the pull-in noise between the armature and the iron core.

[0021] - After the flexible plug collides with the coil frame, it is affected by the armature's attraction force, the guidance and containment of the relief cavity, and the bending deformation of the flexible plug into the relief cavity. It is almost not subjected to the clamping force of the armature. That is, the flexible plug is basically in a free state of uncompressed energy storage between the armature and the coil frame. The bending deformation of the flexible plug is mainly caused by the guiding deformation of the relief cavity on the coil frame. The reaction force of the flexible plug basically does not act on the armature. The release reaction force on the armature is basically from the elastic force of the automatic spring assembly.

[0022] Thus, the aforementioned technical measures reliably eliminate the noise from the armature attracting onto the iron core through the collision buffering of the flexible plug, resulting in good noise reduction and silencing effects. Furthermore, the accommodating cavity for the flexible plug effectively prevents the flexible plug from compressing and storing energy between the armature and the coil frame, eliminating the release reaction force exerted by the flexible plug on the armature, thus ensuring high reliability. In other words, these technical measures achieve excellent noise reduction and silencing effects while essentially not affecting the design performance of the electromagnetic relay, reducing the design difficulty of noise-reducing and silencing electromagnetic relays.

[0023] As one of the preferred solutions, the opening of the relief cavity has a collision slope for the flexible plug on the armature to make contact and collision on the coil frame.

[0024] The collision ramp guides the flexible plug to bend and deform upon impact.

[0025] The above-mentioned technical measures enable the relief cavity on the coil frame and the flexible plug on the armature to reliably achieve contact, collision and bending deformation guidance during the armature attraction process, ensuring that the flexible plug on the coil frame that is collided can reliably bend and deform into the relief cavity during the armature attraction process, resulting in high reliability.

[0026] Furthermore, the armature spans across the outer end of the iron core on the coil frame, serving as a connection to the flexible plug;

[0027] After the armature is attracted into place on the iron core, the axis of the flexible plug and the center of the relief cavity are vertically offset, and the center of the relief cavity is closer to the iron core than the axis of the flexible plug.

[0028] The collision ramp is formed at the opening of the relief cavity on the side away from the iron core.

[0029] The above technical measures are based on the seesaw effect of the armature flipping on the coil frame. The outermost part of the armature is connected to a flexible plug, and a collision slope is formed at the cavity opening on the side away from the iron core of the relief cavity. This allows the flexible plug carried by the armature flipping in the seesaw effect to reliably enter the relief cavity and land on the collision slope to generate contact collision, ensuring that the contact collision and cavity avoidance of the flexible plug on the coil frame are reliably achieved.

[0030] Meanwhile, the above-mentioned technical measures not only effectively avoid the influence of the flexible plug on the attraction between the armature and the iron core, but also require less effort to connect to the flexible plug at other parts of the armature, have lower requirements for magnetic flux attraction force when the armature is attracted, and have a better buffering effect during the armature attraction process.

[0031] Furthermore, the impact head of the flexible plug is formed in a stepped structure on the plunger body, and the stepped structure is located on the side of the flexible plug that serves as the mating impact ramp.

[0032] After the armature is engaged with the iron core, the stepped structure on the flexible plug is flush with the current surface of the coil frame.

[0033] The aforementioned technical measures involve molding the impact head onto the plunger body with a stepped structure, causing the axis of the impact head to be staggered relative to the axis of the plunger body relative to the impact ramp. This allows the impact head of the flexible plug to collide with the area near the lower edge of the impact ramp during the armature's attraction. The impacted impact head can reliably bend and deform through the impact ramp and enter the relief cavity. The bending and deformation of the impact head is more flexible, and the impact head is relatively relaxed within the relief cavity, avoiding excessive friction with the cavity wall, which is beneficial for the armature release process. Furthermore, the aforementioned technical measures effectively reduce positional interference between the flexible plug and the coil frame due to entering the relief cavity.

[0034] As a preferred embodiment, the relief cavity is formed in the coil frame as a through-hole structure. This technical measure ensures reliable forming of the relief cavity while directly eliminating the adverse effects on the injection molding process of the coil frame caused by the thin-walled portion created by the forming of the relief cavity.

[0035] As one of the preferred solutions, the flexible plug is fixed to the corresponding connection part of the armature by a through-fitting assembly structure;

[0036] The armature is used as a part to connect the flexible plug, and has a plunger hole for the flexible plug to be inserted and assembled.

[0037] The above-mentioned technical measures facilitate the simple, easy, and efficient assembly of the flexible plug at the corresponding part of the armature, and are conducive to automated assembly on the production line.

[0038] Furthermore, on the plunger body of the flexible plug, limit caps and anti-dislodgement barbs are arranged along the axial spacing of the plunger body. The limit caps and anti-dislodgement barbs are formed radially outward on the plunger body, forming a fitting limit neck on the plunger body.

[0039] The flexible plug is inserted into the plunger hole fixed on the armature through the insertion limiting neck.

[0040] The flexible plugs of the above-mentioned technical measures have a stable and reliable fitting structure at the corresponding part of the armature, are not easy to fall off, and have good service longevity.

[0041] Furthermore, the limiting cap of the flexible plug is formed on the plunger body at the end away from the impact head;

[0042] The anti-detachment barb of the flexible plug is formed on the plunger body that is closer to the collision head than the limiting cap, and the side of the anti-detachment barb opposite to the limiting cap has a bevel structure.

[0043] The flexible plug is inserted into the plunger hole on the armature using the collision head as the insertion front end. During the insertion process, the insertion guide slope on the anti-detachment barb passes through the plunger hole on the armature.

[0044] The above-mentioned technical measures are beneficial in three ways: firstly, they facilitate the easy and smooth installation of the flexible plug on the armature; secondly, they make the installation and assembly structure of the flexible plug on the armature more compact; and thirdly, they effectively prevent the flexible plug from falling off the armature when it is impacted.

[0045] Furthermore, the plunger hole on the armature is a stepped hole structure formed by an inwardly concave stepped structure at one or both ends.

[0046] After the flexible plug is inserted into the plunger hole on the armature, the limiting cap and / or anti-dislodgement barb of the flexible plug are embedded in the stepped hole at the corresponding end of the plunger hole.

[0047] The above-mentioned technical measures ensure stable installation of the flexible plug and facilitate a compact arrangement of the installed flexible plug on the armature, avoiding any adverse impact on the compactness of the entire relay structure due to the presence of the flexible plug.

[0048] As one preferred embodiment, the flexible plug is a plunger-shaped structure formed from an elastic, deformable, insulating rubber material. This technical measure, on the one hand, facilitates collision contact between the flexible plug and the coil frame, resulting in a good noise reduction effect; on the other hand, it does not interfere with the magnetic flux of the electromagnetic relay.

[0049] The beneficial technical effects of the present invention are as follows: The above-mentioned technical measures are aimed at the special characteristics of the armature of the electromagnetic relay, which generates noise due to metal contact and collision on the iron core due to attraction. The collision buffer of the flexible plug reliably eliminates the noise of the armature attracting on the iron core, and the noise reduction and sound absorption effect is good. The accommodating cavity of the flexible plug effectively avoids the compression and energy storage of the flexible plug between the armature and the coil frame, and eliminates the release reaction force of the flexible plug on the armature, resulting in high reliability. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of one structure of the present invention.

[0051] Figure 2 This is a schematic diagram illustrating the state of the flexible plug colliding and decelerating on the coil frame during the attraction process of the present invention.

[0052] Figure 3 for Figure 2 AA view.

[0053] Figure 4 This is a schematic diagram showing the state in which the flexible plug is guided to deform and the armature is attracted during the attraction process of the present invention.

[0054] Figure 5 for Figure 1 , Figure 2 , Figure 3 and Figure 4 A top view of the coil frame.

[0055] Figure 6 for Figure 1 , Figure 2 , Figure 3 and Figure 4 A schematic diagram of the mating structure between the armature and the coil frame.

[0056] Figure 7 for Figure 1 , Figure 2 , Figure 3 and Figure 4 A schematic diagram of the flexible plug in the image.

[0057] The symbols in the diagram mean: 1—armature; 11—plunger perforation; 12—barbed step; 2—coil frame; 21—yield cavity; 22—collision ramp; 3—flexible plug; 31—plunger body; 32—limiting cap; 33—anti-detachment barb; 34—insertion guide ramp; 35—insertion limiting neck; 36—collision head; 4—iron core. Detailed Implementation

[0058] This invention relates to electromagnetic relays, specifically an electromagnetic relay capable of noise reduction and silencing. The main technical content of this invention will be described in detail below with several embodiments. Embodiment 1 is illustrated in conjunction with the accompanying drawings—that is… Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The technical solution of the present invention is clearly and in detail explained; although other embodiments are not shown in separate drawings, their main structure can still be referred to the drawings of Embodiment 1.

[0059] It should be noted that the accompanying drawings of this invention are schematic, and unnecessary details have been simplified in order to clarify the technical objectives of this invention, so as to avoid obscuring the technical solutions contributed by this invention to the prior art.

[0060] Example 1

[0061] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the electromagnetic relay of the present invention mainly consists of a base, a coil frame 2, a coil, an iron core 4, an armature 1, a yoke, a compression spring, a pusher, a moving spring assembly, and a stationary spring assembly.

[0062] The armature 1 is spring-loaded onto the blade edge of the yoke. The attracting end of the armature 1 extends above the coil frame 2, covering the corresponding end of the iron core 4, and the pushing end of the armature 1 is connected to a push clip. Under the action of magnetic flux attraction and the elastic force of the moving spring assembly, the armature 1 can rotate on the coil frame 2 around the yoke blade edge. Specifically:

[0063] -After the coil is energized, the armature 1, under the action of magnetic flux attraction, is attracted to the corresponding end of the iron core 4 through the attraction end;

[0064] - After the power is cut off, the magnetic attraction is eliminated, and the pusher under the action of the moving spring assembly pushes the armature (i.e., resets), so that the armature 1 releases the attracted state at the end of the iron core 4, and the attracted end of the armature 1 and the corresponding end of the iron core 4 are in clearance fit.

[0065] In the conventional structure of the relay described above, the outer end of the armature 1's pull-in end, i.e., the outer end of the armature 1 that spans the iron core 4 on the coil frame 2, is used to connect the flexible plug 3. The outer end of the armature 1's pull-in end serves as the mounting structure for the flexible plug 3, and it has a plunger hole 11 that connects the inner and outer surfaces of the armature 1. The inner end of the plunger hole 11 is formed with a concave step structure, resembling a stepped hole.

[0066] The flexible plug 3 is a plunger-shaped structure made of elastic, deformable insulating rubber material.

[0067] The flexible plug 3 has a plunger body 31 with a plunger-like structure, and one end of the plunger body 31 serves as a collision head 36 that contacts and collides with the coil frame 2.

[0068] On the plunger body 31, limit caps 32 and anti-detachment barbs 33 are arranged at intervals along its axial direction. The limit caps 32 and anti-detachment barbs 33 are formed on the plunger body 31 with a radially outward convex structure, thereby forming a reduced-diameter insertion limiting neck 35 on the plunger body 31. The limit cap 32 is formed on the plunger body 31 at the end away from the impact head 36, and its top surface is a planar structure. The anti-detachment barb 33 is formed on the plunger body 31 at a position closer to the impact head 36 than the limit cap 32. The side of the anti-detachment barb 33 opposite to the limit cap 32 has a beveled structure, that is, the cross-section of the anti-detachment barb 33 is basically triangular. In order to be able to connect smoothly with the armature 1, the side of the anti-detachment barb 33 facing the limit cap 32 is basically a planar structure. In this way, the limit cap 32 and anti-detachment barb 33 of the flexible plug 3 form an insertion limiting neck 35 that basically matches the plunger through hole 11 on the armature 1.

[0069] The aforementioned flexible plug 3, with the impact head 36 as its insertion tip, is inserted into the plunger hole 11 of the armature 1. During insertion and assembly within the plunger hole 11 on the armature 1, the insertion guide slope 34 on the anti-disengagement barb 33 tightens the plug as it passes through the plunger hole 11 on the armature 1. After insertion, the limiting cap 32 is located on the outer surface of the armature 1, and the anti-disengagement barb 33 is located on the inner surface of the armature 1 and embedded in the inner end stepped hole of the plunger hole 11. Thus, the flexible plug 3 is inserted and fixed within the plunger hole 11 on the armature 1 through the insertion limiting neck 35 between the limiting cap 32 and the anti-disengagement barb 33, with virtually no loosening or displacement.

[0070] With the above structure, the flexible plug 3 extends from the inner surface of the armature 1 around the iron core 4, and the extension length is greater than the height of the mating gap between the armature 1 and the coil frame 2 at this part after the armature 1 is attracted into place.

[0071] For ease of description of the clearance cavity 21 below, the length of the flexible plug 3 extending from the inner surface of the armature 1 is divided into two segments: one segment is a reference segment that basically corresponds to the height of the mating gap between the armature 1 and the coil frame 2, and the other segment is a contact collision segment that exceeds the reference segment.

[0072] The coil frame 2 is used to correspond to the area where the flexible plug 3 is connected to the armature 1. It has a recessed cavity 21 formed in the shape of a recess, which is used for the flexible plug 3 to enter when it comes into contact with the collision, so as to prevent the flexible plug 3 from being compressed and storing energy.

[0073] The relief cavity 21 is formed with a through-hole structure at the corresponding part of the coil frame 2, that is, it directly connects the inner and outer sides of the coil frame 2, avoiding the formation of a thin wall at the bottom of the blind hole when formed with a blind hole structure, which would affect the injection molding of the coil frame. The depth of the relief cavity 21 is greater than the contact collision section of the extended length of the flexible plug 3.

[0074] The cavity opening of the relief cavity 21 is slightly larger than the impact head 36 of the flexible plug 3, allowing the impact head 36 of the flexible plug 3 to be freely inserted.

[0075] During the attraction and flipping process of the armature 1 on the coil frame 2:

[0076] -Because the extension length of the flexible plug 3 on the inner surface of the armature 1 is greater than the height of the mating gap between the armature 1 and the coil frame 2 at this part after the armature 1 is attracted into place, the contact collision of the flexible plug 3 on the coil frame 2 precedes the attraction collision of the armature 1 on the iron core 4.

[0077] - The contact collision of the flexible plug 3 on the coil frame 2 is almost noiseless; due to the pressure deformation of the flexible plug 3, the overturning impact of the armature 1 is buffered, the impact speed of the armature 1 at the end of the engagement is reduced, and the armature 1 engages the core 4 as smoothly as possible.

[0078] - The flexible plug 3, which is subjected to impact, enters the relief cavity 21 by bending and deforming during the continuous attraction of the armature 1, so as to prevent the armature 1, which is attracted into place, from compressing the flexible plug 3 on the coil frame 2.

[0079] In the above structure, since the armature 1 at the location of the flexible plug 3 moves along a slightly arc-shaped trajectory during the attraction and flipping, the axis of the flexible plug 3 on the corresponding surface of the contact coil frame 2 is not perpendicular to the coil frame 2, and it is prone to outward deformation due to compression. To prevent this phenomenon, a collision slope 22 is formed at the opening of the relief cavity 21. That is, the collision slope 22 is formed at the opening of the relief cavity 21 on the side away from the iron core 4. This collision slope 22 allows the flexible plug 3 on the armature 1 to make contact and collision on the coil frame 2, and constrains it to deform completely in a set direction. Therefore, the angle between the collision slope 22 and the contact flexible plug 3, from the inner side near the iron core 4, must be greater than 90°. Then, from the outer side away from the iron core 4, the angle between the collision slope 22 and the contact flexible plug 3 must be less than 90°. During the continuous attraction of the armature 1, the collision head 36 of the collided flexible plug 3 undergoes inward bending deformation, thereby reliably entering the relief cavity 21. That is, the collision slope 22 guides the collided flexible plug 3 to undergo collision bending deformation.

[0080] In addition to the collision ramp 22 at the opening of the clearance cavity 21, the collision head 36 of the flexible plug 3 is formed in a stepped structure on the plunger body 31, and this stepped structure is located on the side (i.e., the outer side) of the flexible plug 3 that serves as the mating collision ramp 22. This design is because, although the armature 1 at the location of the flexible plug 3 moves in an arc-shaped trajectory during the attraction and flipping, this arc-shaped trajectory is still very small. By stepping the collision head 36 of the flexible plug 3 on the plunger body 31, the axis of the plunger body 31 and the axis of the collision head 36 are differentiated, so that the small contact surface of the collision head 36 contacts the collision ramp 22 at the opening of the clearance cavity 21. The aforementioned stepping of the collision head 36 should ensure that after the armature 1 is attracted into place on the iron core 4, the stepped structure on the flexible plug 3 is at least slightly higher than the current surface of the coil frame 2.

[0081] With the above structure, after the armature 1 is attracted into place on the iron core 4, the axis A of the flexible plug 3 and the center line B of the relief cavity 21 are arranged in a staggered manner in the vertical direction. The axis A of the flexible plug 3 is relatively close to the edge of the collision slope 22, and the center line B of the relief cavity 21 is closer to the iron core 4 than the axis A of the flexible plug 3.

[0082] The above structure, with negligible low-noise contact and collision between the flexible plug 3 and the coil frame 2, unloads most of the attraction and flipping impact force of the armature 1, reduces the flipping impact speed of the armature 1 at the end of its attraction, and allows the armature 1 to slowly attract onto the iron core 4, eliminating the attraction noise between the armature 1 and the iron core 4. After the flexible plug 3 collides with the coil frame 2, under the influence of the attraction force of the armature 1 and the guidance and accommodation of the relief cavity 21, the flexible plug 3 undergoes bending deformation and enters the relief cavity 21. It is almost not subjected to the clamping force of the armature 1, that is, the flexible plug 3 is basically in a free state of uncompressed energy storage between the armature 1 and the coil frame 2, and the release reaction force on the armature 1 comes mainly from the elastic force of the spring assembly.

[0083] Example 2

[0084] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0085] The outer end of the plunger perforation on the armature (i.e. the end where the limiting cap is located) is formed with an inwardly concave step structure. After the flexible plug is installed in place, the limiting cap of the flexible plug is embedded in the step hole at the outer end of the plunger perforation, reducing the protrusion from the outer surface of the armature.

[0086] Example 3

[0087] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0088] The anti-disengagement barb of the flexible plug is formed on the plunger body at the end away from the impact head, and its outer side is a beveled structure, that is, the cross-section of the anti-disengagement barb is basically triangular.

[0089] The limiting cap of the flexible plug is formed on the plunger body at a position closer to the impact head than the anti-dislodge barb;

[0090] Correspondingly, the plunger perforation on the armature has a concave stepped hole structure at its outer end. After the flexible plug is installed in place, the anti-dislodgement barb is embedded in the stepped hole at the outer end of the plunger perforation, reducing the protrusion from the outer surface of the armature.

[0091] The aforementioned flexible plug uses anti-detachment barbs as the insertion front end and is inserted and connected to the plunger hole of the armature.

[0092] Example 4

[0093] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0094] The flexible plug is fixed to the inner surface of the armature by adhesive or screw connection.

[0095] Example 5

[0096] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0097] There is no collision ramp inside the relief cavity, but the cavity opening size is large enough to accommodate the initial insertion of the collision head of the flexible plug. After insertion, the collision head can contact and collide with the outer cavity wall of the relief cavity away from the armature.

[0098] The impact head of the flexible plug is formed on the plunger body with a basically uniform diameter structure, without the need for step formation.

[0099] The above embodiments are only used to illustrate the present invention and are not intended to limit it.

[0100] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications can still be made to the above embodiments, or equivalent substitutions can be made to some of the technical features, such as using other elastic rubber materials to form the flexible plug; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the present invention.

Claims

1. A noise reduction type electromagnetic relay, comprising an armature (1) assembled on a coil holder (2), said armature (1) serving to contact a core (4) on the coil holder (2) during an attraction process; characterized in that: said armature (1) is connected with a flexible plug (3) extending from an inner side surface of said armature (1) at a periphery of a region serving to contact said core (4); an extension length of said flexible plug (3) from the inner side surface of said armature (1) is greater than a fitting gap height between said armature (1) and the coil holder (2) in a region where said flexible plug (3) is located after said armature (1) is attracted in place on said core (4); said coil holder (2) is formed with a relief cavity (21) in an inner recess structure at a region corresponding to said flexible plug (3) on said armature (1); a depth of said relief cavity (21) is at least equal to a portion of said extension length of said flexible plug (3) that is greater than the fitting gap height between said armature (1) and said coil holder (2); said flexible plug (3) contacts and collides on said coil holder (2) prior to said armature (1) being attracted and colliding on said core (4) during an attraction process of said armature (1) on said coil holder (2); the collided flexible plug (3) is bent and deformed into said relief cavity (21) during the attraction process of said armature (1); and after said armature (1) is attracted in place on said core (4), a center axis of said flexible plug (3) is vertically misaligned with a center of said relief cavity (21), and the center of said relief cavity (21) is closer to said core (4) than the center axis of said flexible plug (3).

2. The noise reduction type electromagnetic relay according to claim 1, characterized in that: said relief cavity (21) is provided with a collision inclined surface (22) at a cavity opening for said flexible plug (3) on said armature (1) to contact and collide on said coil holder (2); and said collision inclined surface (22) guides the bent deformation of the collided flexible plug (3).

3. The noise reduction type electromagnetic relay according to claim 2, characterized in that: said armature (1) is connected with said flexible plug (3) at a region spanning an outer end of said core (4) on said coil holder (2); and said collision inclined surface (22) is formed at a cavity opening of said relief cavity (21) away from said core (4).

4. The noise reduction type electromagnetic relay according to claim 3, characterized in that: a collision head (36) of said flexible plug (3) is formed in a stepped structure on a plug body (31), and the stepped structure is at a side of said flexible plug (3) serving to contact said collision inclined surface (22); and after said armature (1) is attracted in place on said core (4), the stepped structure on said flexible plug (3) is at a lowest level flush with a current surface of said coil holder (2).

5. The noise reduction type electromagnetic relay according to claim 1, 2 or 3, characterized in that: said relief cavity (21) is formed in a through-hole structure on said coil holder (2).

6. The noise reduction type electromagnetic relay according to claim 1, 3 or 4, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The flexible plug (3) is fixed in the corresponding connecting part of the armature (1) in a through combination structure. The armature (1) is used as a part for connecting the flexible plug (3), and a plunger through hole (11) is formed for the through combination of the flexible plug (3).

7. The electromagnetic relay according to claim 6, characterized in that: The plunger body (31) of the flexible plug (3) is arranged with a limiting cap (32) and an anti-falling hook (33) along the axial distance of the plunger body (31), the limiting cap (32) and the anti-falling hook (33) are formed in a radial outward protrusion on the plunger body (31), and a through limiting neck (35) is formed on the plunger body (31); The flexible plug (3) is fixed in the plunger through hole (11) on the armature (1) through the through limiting neck (35).

8. The electromagnetic relay according to claim 7, characterized in that: The limiting cap (32) of the flexible plug (3) is formed on the plunger body (31) away from the impact head (36); The anti-falling hook (33) of the flexible plug (3) is formed on the plunger body (31) closer to the impact head (36) than the limiting cap (32), and the side opposite to the limiting cap (32) of the anti-falling hook (33) is a slope structure; The flexible plug (3) uses the impact head (36) as the penetrating front end, and is combined in the plunger through hole (11) on the armature (1) in a through combination, and the through guide slope (34) on the anti-falling hook (33) passes through the plunger through hole (11) on the armature (1) during the through process.

9. The electromagnetic relay according to claim 7 or 8, characterized in that: The plunger through hole (11) on the armature (1) is a stepped hole structure formed with an inner recess step structure at one end or both ends; After the flexible plug (3) is through combined in the plunger through hole (11) on the armature (1), the limiting cap (32) and / or the anti-falling hook (33) of the flexible plug (3) are embedded in the stepped hole of the corresponding end part of the plunger through hole (11).

10. The electromagnetic relay according to claim 1, 4, 7 or 8, characterized in that: The flexible plug (5) is a plunger-shaped structure formed of an elastic and deformable insulating rubber material.

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