A push rod type electromagnetic relay

Abstract

This invention discloses a push-rod type electromagnetic relay, including a push clip and an armature mounted on a base. The armature mating end of the push clip has an outwardly convex armature positioning protrusion, and the push clip mating part of the armature has a notch-shaped push clip mounting groove formed from the bottom edge. During the insertion process of the armature onto the base, the armature mounts over the armature positioning protrusion through the push clip mounting groove, and the armature positioning protrusion is embedded in the push clip mounting groove. This invention addresses the special characteristics of push-rod type electromagnetic relays by eliminating the need to bend or pry open the moving spring during the assembly process of the armature and push clip, resulting in high assembly efficiency and quality, better adapting to the convenience of automated assembly, and reducing assembly technical difficulty. It also exhibits good drop resistance and effectively reduces wear on the mating surfaces between the armature and push clip, resulting in less burrs and higher mechanical durability of the finished relay.

Description

Technical Field

[0001] This invention relates to electromagnetic relays, specifically a push-rod type electromagnetic relay. Background Technology

[0002] See Figure 1 As shown, a common push-rod type electromagnetic relay mainly consists of a base 1, a coil 8, a yoke 5, and an armature 3. ， 7. Compression spring; 2. Push card ， 4 moving reeds ， It consists of a stationary reed 6, a coil 8 mounted on a coil frame 13 on a base 1, a yoke 5 mounted on a yoke frame 12 outside the coil 8, and an armature 3. ， The spring 7 is pressed against the yoke 5 and can swing, and the movable spring 4 is... ， Assembled on armature 3 ， On the side of the base 1, the stationary spring 6 is located at the position of the moving spring 4. ， To the side, push card 2 ， Assembled on armature 3 ， With moving reed 4 ， It is located between the base 1 and the magnetic circuit barrier 11. The working principle of this electromagnetic relay is:

[0003] When the pins of coil 8 are energized, the excitation current of coil 8 will generate magnetic flux, which passes through the iron core and armature 3. ， The yoke 5 and the working air gap form a magnetic circuit, and generate electromagnetic attraction in the working air gap;

[0004] -When the excitation current rises to the set value, the electromagnetic attraction torque will overcome the moving reed 4 ， The reaction torque causes armature 3 ， It swings on the yoke 5, driving the pusher 2. ， Push spring 4 ， , causing the spring 4 ， The moving contact of the stationary reed 6 closes with the stationary contact of the stationary reed 6;

[0005] - When the excitation current decreases to the set value, the moving reed 4 ， The reaction torque is greater than the electromagnetic attraction torque, causing the armature 3 ， Returning to the initial state, moving reed 4 ， The moving contact of the stationary reed 6 is disconnected from the stationary contact of the stationary reed 6.

[0006] See Figure 1 and Figure 2 As shown, the above-mentioned electromagnetic relay molding structure has the following structural features:

[0007] - Armature 3 ， The push card mating part has a push card insertion hole with a through hole structure located directly below the compression spring through hole;

[0008] -Moving spring 4 ， The push card mating part has a push card insertion hole with a through hole structure located directly below the moving contact;

[0009] -Push Card 2 ， At the middle of the armature mating end, there is an outwardly convex armature positioning protrusion; push the card 2 ， At the middle of the mating end of the moving spring, there is a convexly shaped moving spring positioning protrusion;

[0010] -Push Card 2 ， The armature positioning protrusion is inserted into armature 3. ， Push the card into the card slot, push card 2 ， The positioning protrusion of the moving spring is inserted into the moving spring plate 4. ， Push the card into the slot.

[0011] Although the push-rod type electromagnetic relay with the above structural features has good drop resistance, it also has the following main technical problems:

[0012] 1. When assembling the armature and the push card, the moving spring needs to be bent and pried open towards the stationary spring using a shift fork on the assembly line. This creates a space between the moving spring and the armature that can effectively accommodate the length of the push card (i.e., the maximum length between the end of the moving spring positioning protrusion and the end of the armature positioning protrusion). The push card is then placed between the armature and the moving spring in the corresponding direction, with the armature positioning protrusion inserted into the push card insertion hole on the armature and the moving spring positioning protrusion inserted into the push card insertion hole on the moving spring. The shift fork is then released to reset the moving spring, thus completing the insertion hole assembly between the push card and the armature, and between the push card and the moving spring.

[0013] It is evident that the insertion hole assembly structure between the push card and the armature will increase the technical difficulty of the assembly process and reduce the assembly efficiency. In addition, the assembly process inevitably caused by this structure will result in poor consistency of the stroke of the shift fork on the assembly line, which will cause some moving springs to be easily deformed due to excessive bending, and thus lead to poor consistency of product parameters of each relay product.

[0014] 2. The socket assembly structure between the push card and the armature results in a small contact surface between the push card and the armature. When the armature pushes the push card during repeated swinging, the contact surface between the armature and the push card is prone to repeated friction, which generates wear shavings and accumulates. The presence of shavings will have an adverse effect on the conductivity of the relay.

[0015] 3. The single-hole assembly structure between the push card and the moving spring requires the push card hole on the moving spring to be centered directly below the moving contact. During the pushing process of the push card, it is pushed towards the center position, which easily leads to poor alignment between the upper moving contact and the side stationary contact. In addition, since the contact force surface between the push card and the moving spring is small, the moving spring is prone to overheating during repeated pushing. In addition, prolonged operation can easily cause excessive wear of the push card, thus making it unable to work reliably.

[0016] 4. The push card sits on the magnetic circuit baffle of the base in a surface contact manner through the bottom surface. During the mutual pushing process between the armature and the moving spring, the frictional resistance between the push card and the top surface of the magnetic circuit baffle is relatively large, which requires a sufficiently large electromagnetic attraction torque and moving spring counter torque to overcome. This is contradictory to the miniaturization of the relay and is not conducive to the miniaturization of the relay, especially the ultra-miniaturization. Summary of the Invention

[0017] The technical objective of this invention is to provide a push-rod electromagnetic relay that, in view of the special characteristics of the aforementioned push-rod type electromagnetic relay and the shortcomings of the prior art, can achieve both good drop resistance and facilitate high-efficiency, high-quality assembly with low assembly technical difficulty.

[0018] The technical objective of this invention is achieved through the following technical solution: a push rod type electromagnetic relay, comprising a push clip and an armature mounted on a base, wherein the armature mating end of the push clip has an outwardly convex armature positioning protrusion, and the push clip mating part of the armature has a notch-shaped push clip riding groove formed from the bottom edge.

[0019] During the insertion process of the armature on the base, the armature positioning protrusion is mounted on the armature positioning protrusion by the push card mounting groove, and the armature positioning protrusion is embedded in the push card mounting groove.

[0020] The above-mentioned technical measures, taking into account the special characteristics of push rod electromagnetic relays, form a notch-shaped push card mounting groove with an inwardly concave bottom edge in the armature push card mating part. Thus, during the assembly process with the push card, there is no need to bend or pry open the moving spring. The push card and the moving spring are first assembled and placed on the magnetic circuit baffle of the base. Then, the armature is directly inserted into the yoke. The inserted armature rides on the armature positioning protrusion of the push card through the push card mounting groove. Compared with the existing assembly technology, it eliminates the process of prying open and bending the moving spring with the shift fork, resulting in higher assembly efficiency. At the same time, it avoids deformation of the moving spring, resulting in higher assembly quality and better adapting to the convenience of automated assembly. The assembly technology is less difficult.

[0021] The above technical measures enable the armature positioning protrusion embedded in the push card straddle groove to achieve mutual limiting between the push card and the armature. Under the action of the compression spring and the moving spring, it will not loosen or fall off, and also has good drop resistance.

[0022] Furthermore, the straddling and embedding structure between the armature push card mating part and the armature positioning protrusion of the push card allows the armature push card mating part to sit on the armature mating end "shoulder" on both sides of the armature positioning protrusion with a larger mating force-bearing surface. When the armature pushes the push card during repeated swinging, it effectively reduces the wear of the mating force-bearing surface between the armature and the push card, resulting in less burrs and higher mechanical durability of the finished relay.

[0023] As one of the preferred solutions, the armature's push-lock straddle slot is mainly composed of a guide section and a straddle section that pass through in sequence;

[0024] The width of the opening end of the guide section is greater than the width of the root end, and it has a dovetail groove structure along the depth direction. The width of the opening end of the guide section is greater than the width of the straddling area of ​​the armature positioning protrusion.

[0025] The width of the straddle section is sufficient to fit into the straddle area of ​​the armature positioning protrusion.

[0026] The aforementioned technical measures form a dovetail groove structure on the armature, which effectively guides the armature positioning protrusion embedded in the push card during the insertion process of the armature on the base. This ensures that the inserted armature is aligned with the armature positioning protrusion, thus improving assembly efficiency and quality. In addition, it effectively prevents friction or at least scratching of the armature positioning protrusion during the insertion process of the push card, effectively reducing the generation of lint.

[0027] At the same time, compared with the traditional armature structure, the above-mentioned technical measures effectively reduce the molding material and molding weight of the armature in the same specification structure, which is conducive to reducing molding costs and also conducive to the miniaturization, especially the ultra-miniaturization, of the finished relay.

[0028] Furthermore, the width of the straddle section matches the width of the straddle area of ​​the armature positioning protrusion;

[0029] The depth of the straddle section matches the height of the straddle area of ​​the armature positioning protrusion.

[0030] The above-mentioned technical measures can ensure a stable fit between the properly installed armature and the pusher, preventing the armature positioning protrusion from shaking in the pusher's straddling groove. This improves both the drop resistance and the displacement accuracy of the pusher under the armature's push.

[0031] As one of the preferred solutions, the bottom end of the push card mating part on both sides of the push card straddling groove of the armature has a bent protrusion that is bent towards the yoke.

[0032] During the swinging of the armature on the base, the bent protrusion serves as a magnetic isolation structure that abuts against and engages the armature and the yoke.

[0033] In the structure of a push-rod type electromagnetic relay, to prevent magnetic short circuits between the oscillating armature and yoke, a magnetic shielding structure (such as a copper sheet) is provided between the armature and yoke. The oscillating armature abuts against the magnetic shielding structure via a protrusion added to the bottom of the push-lock engagement part. Based on this specific feature, the above technical measures achieve the same anti-magnetic short circuit effect as traditional methods by forming a bent protrusion at the bottom of the armature's push-lock engagement part. Furthermore, the armature's forming process is more convenient, the forming structure is simpler, less material is used, and the weight is lighter, which helps reduce forming costs.

[0034] Meanwhile, the curved protrusion is more conducive to the insertion of the armature. By pushing the card to cross the slot and embedding it into the armature positioning protrusion of the push card, the bottom end of the inserted armature is prevented from falling on the push card body and failing to be embedded into the armature positioning protrusion. That is, the bending characteristics of the curved protrusion form a downward insertion guide at the "shoulder" on both sides of the armature positioning protrusion, which is conducive to the easy, smooth and efficient straddling assembly of the armature at the armature mating end of the push card, and reduces assembly debris. This is conducive to the realization of efficient and low-cost automated assembly of the armature.

[0035] As one of the preferred solutions, the armature mating end of the push card has a base positioning protrusion on both sides of the armature positioning protrusion, and the base positioning protrusion on both sides respectively forms a gap mating with the armature positioning protrusion.

[0036] During the assembly process of the push card with the base, the base positioning protrusions on both sides of the armature mating end abut against the corresponding side yoke iron frame on the base; and, in the state where the base positioning protrusions on both sides abut against the corresponding side yoke iron frame, the base positioning protrusions on both sides and the armature positioning protrusion respectively form an armature straddling slot that can be correspondingly inserted into the push card mating part on both sides of the push card straddling slot.

[0037] The aforementioned technical measures, through the positioning protrusions on both sides of the base, ensure that the push clip, assembled with the moving spring, can form a relatively stable position on the base, thereby ensuring the reliable existence of the armature insertion space and preventing the push clip from blocking the armature insertion space under the reaction torque of the moving spring. In other words, through the abutment positioning of the positioning protrusions on both sides of the base on the corresponding yoke frame, it is ensured that the armature straddling slot between the armature positioning protrusion and the positioning protrusions on both sides of the base is always present.

[0038] Meanwhile, the armature straddling slot structure formed between the armature positioning protrusion and the positioning protrusions on both sides of the base ensures stable mounting and engagement of the push card and the armature, which helps to further improve the anti-drop performance.

[0039] As one of the preferred solutions, the moving spring mating end of the push card has two moving spring positioning arms that are outwardly convex and form a spacing fit.

[0040] The outer end of the moving spring positioning arm has a moving spring connecting protrusion that can be inserted into the corresponding side insertion hole of the moving spring sheet.

[0041] The above-mentioned technical measures push the card through both sides in the width direction to apply a pushing force to the moving spring. During the pushing process, the alignment between the upper moving contact and the side stationary contact is good and it is not easy for misalignment to occur, which helps to ensure reliable contact between the moving and stationary contacts and stable working performance.

[0042] In addition, this kind of mating structure between the push card and the moving spring effectively increases the mating force-bearing surface, which helps to reduce the wear of the push card during service.

[0043] Furthermore, in the assembly structure between the push card and the base, the push card is located on the top surface of the corresponding magnetic circuit barrier wall on the base;

[0044] The surface of the push card used to cooperate with the magnetic circuit barrier has two sets of raised displacement ribs. These two sets of displacement ribs correspond to the positions of the two moving spring positioning arms on the push card and are formed along the length direction of the moving spring positioning arms to the armature mating end.

[0045] The aforementioned technical measures will promote the contact fit between the bottom surface of the push card and the top surface of the magnetic circuit barrier wall of the base. The contact fit is designed as a line and surface contact fit, which not only ensures the stable support of the magnetic circuit barrier wall for the push card, but also greatly reduces the frictional resistance of the push card reciprocating on the top surface of the magnetic circuit barrier wall. It is suitable for the work process in which the electromagnetic attraction torque and the moving spring reaction torque can push each other, which is conducive to the miniaturization, especially the ultra-miniaturization, of the relay.

[0046] Furthermore, the surface of the push card that serves as a mating element with the magnetic circuit barrier has a set of raised guide ribs, which correspond to the position of the armature positioning protrusion on the push card and are formed along the length of the armature positioning protrusion.

[0047] Furthermore, one end of the guide rib in the length direction intersects with the displacement rib, and the other end extends beyond the end of the displacement rib.

[0048] The above-mentioned technical measures address the structural characteristics of the push card, which has an armature positioning protrusion formed in reverse extension and two moving spring positioning arms. The guide rib formed at the bottom of the armature positioning protrusion extends the displacement rib formed at the bottom of the moving spring positioning arm. Thus, regardless of how the reciprocating stroke of the push card changes between the armature and the moving spring, it can ensure that the push card sits on the top surface of the magnetic circuit barrier wall through the displacement rib and the displacement rib supported by the guide rib. This prevents the push card from falling when it moves to the maximum stroke side of the moving spring due to the lack of support from the guide rib, which would cause the displacement rib to get stuck on the magnetic circuit barrier wall, thereby improving operational stability.

[0049] Furthermore, the guide rib has a variable diameter structure along its length, and has a spring segment rib that intersects with the displacement rib in the length direction, and an armature segment rib that extends beyond the displacement rib in the length direction.

[0050] The protruding rib of the moving spring section has a variable diameter structure along its length, gradually increasing in size from the outer end towards the protruding rib of the armature section, and the maximum diameter of the protruding rib of the moving spring section is less than or equal to the diameter of the displacement rib.

[0051] The armature section rib has a variable diameter structure along its length, gradually increasing in size from the moving spring section rib towards the outer end, and the minimum diameter of the armature section rib is greater than or equal to the diameter of the displacement rib.

[0052] The aforementioned technical measures ensure that, during the non-maximum stroke of the push card's displacement towards the moving spring, the guide ribs essentially do not participate in the contact engagement between the displacement ribs and the top surface of the magnetic circuit barrier, thereby reducing contact friction resistance and preventing jamming between the moving spring end of the guide ribs and the magnetic circuit barrier, thus improving operational stability. During the maximum stroke of the push card's displacement towards the moving spring, the armature ends of the two displacement ribs extend beyond the top surface of the magnetic circuit barrier and do not contact it. At this point, the guide ribs transition to contact with the top surface of the magnetic circuit barrier, supporting the push card on the top surface of the barrier. Furthermore, the bottom surface of the displacement ribs is generally higher than the top surface of the barrier, reliably preventing the push card from falling and thus reliably preventing jamming of the armature end of the displacement ribs against the magnetic circuit barrier, further improving operational stability.

[0053] Furthermore, the displacement rib is formed as a cylindrical protrusion on the surface of the push card that serves as a cooperating magnetic circuit barrier, and has a constant diameter structure along the length direction;

[0054] The guide rib is formed in a cylindrical structure on the surface of the push card that serves as a magnetic circuit barrier.

[0055] The displacement ribs and guide ribs of the above-mentioned technical measures have a small contact area with the top surface of the magnetic circuit barrier wall, which helps to reduce the frictional resistance of the pusher reciprocating on the top surface of the magnetic circuit barrier wall. This is suitable for the work process in which the electromagnetic attraction torque and the dynamic spring reaction torque can push each other, which in turn is conducive to the miniaturization, especially the ultra-miniaturization, of the relay.

[0056] The beneficial technical effects of this invention are as follows: The above-mentioned technical measures, tailored to the specific characteristics of push-rod type electromagnetic relays, eliminate the need to bend or pry open the moving spring during the assembly process of the armature and the push card. First, the push card and moving spring are assembled and placed on the magnetic circuit baffle of the base. Then, the armature is directly inserted into the yoke. The inserted armature straddles the armature positioning protrusion of the push card through the push card's straddling slot. This results in higher assembly efficiency, avoids deformation of the moving spring, improves assembly quality, better adapts to the convenience of automated assembly, and reduces assembly technical difficulty. Simultaneously, it reliably achieves mutual limiting between the push card and the armature, preventing loosening or detachment under the action of the compression spring and moving spring, and also exhibits good drop resistance. Furthermore, the straddling and embedding structure between the armature push card mating part and the armature positioning protrusion of the push card allows the armature push card mating part to sit on the armature mating end "shoulder" on both sides of the armature positioning protrusion with a larger mating force-bearing surface. When the armature pushes the push card during repeated swinging, it effectively reduces the wear of the mating force-bearing surface between the armature and the push card, resulting in less burrs and higher mechanical durability of the finished relay. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of a common push-rod type electromagnetic relay.

[0058] Figure 2 for Figure 1 The image shows another angle view of the electromagnetic relay without its base.

[0059] Figure 3 This is a schematic diagram of one structure of the present invention (the compression spring is not shown).

[0060] Figure 4 for Figure 3 Another angle view (compression spring not shown).

[0061] Figure 5 for Figure 3 and Figure 4 A schematic diagram of the push card structure.

[0062] Figure 6 for Figure 5 The diagram shows the bottom structure of the push card.

[0063] Figure 7 for Figure 3 and Figure 4 A schematic diagram of the interaction structure between the push card, the base, and the moving spring.

[0064] Figure 8 for Figure 3 and Figure 4 A schematic diagram of the armature structure.

[0065] Figure 9 for Figure 8 Side view of the armature shown.

[0066] Figure 10 for Figure 3 and Figure 4 The diagram shows a structural schematic of an electromagnetic relay without its base.

[0067] Figure 11 for Figure 10 Another perspective view.

[0068] The symbols in the diagram mean: 1—base; 11—magnetic circuit barrier; 12—yoke frame; 13—coil frame; 2, 2 ， —Push card; 21—Moving spring positioning arm; 22—Moving spring connecting protrusion; 23—Base positioning protrusion; 24—Armature positioning protrusion; 25—Armature straddling slot; 26—Displacement rib; 27—Guide rib; 271—Moving spring section rib; 272—Armature section rib; 3, 3 ， —Armature; 31—Push-up card straddle slot; 311—Guide section; 312—Straddle section; 32—Return bend protrusion; 33—Compression spring perforation; 4, 4 ， 5—Moving reed; 6—Yoke; 7—Stationary reed; 8—Compression spring; 9—Coil. Detailed Implementation

[0069] This invention relates to electromagnetic relays, specifically a push-rod type electromagnetic relay. 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 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 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.

[0070] 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.

[0071] Example 1

[0072] See Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the present invention includes a pusher 2, an armature 3, and a moving spring 4 mounted on a base 1. Of course, in addition to these, the base 1, which is a push rod type electromagnetic relay, is also equipped with a coil 8 on a coil frame 13, a yoke 5 on a yoke frame 12 outside the coil 8, and a stationary spring 6 next to the moving spring 4.

[0073] Specifically, the pusher 2 is located between the armature 3 and the moving spring 4, and it has an armature engagement end that cooperates with the armature 3 and a moving spring engagement end that cooperates with the moving spring 4.

[0074] At the center of the armature mating end of the push card 2, there is an outwardly protruding armature positioning protrusion 24, which is used to embed into the corresponding structure of the armature 3. At both sides of the armature mating end of the push card 2, there are outwardly protruding base positioning protrusions 23, which are used for lateral (relative to the length direction of the push card 2) relative positioning of the push card 2 on the base 1. The base positioning protrusions 23 on both sides form a gap fit with the central armature positioning protrusion 24, that is, the gap between the two base positioning protrusions 23 is on both sides of the armature positioning protrusion 24. This gap fit serves as the armature straddling slot 25 used when assembling the armature 3 with the push card 2. To ensure the stability of the assembly with the armature 3, the outward protrusion length of the two base positioning protrusions 23 is usually less than the outward protrusion length of the central armature positioning protrusion 24.

[0075] At the armature mating end of the aforementioned push card 2, the bottom surface of the armature positioning protrusion 24 is basically flush with the bottom surface of the push card 2 body, and the bottom surfaces of the base positioning protrusions 23 on both sides respectively form a stepped mating with the bottom surface of the push card 2 body.

[0076] On both sides of the moving spring mating end of the push card 2, there are outwardly protruding moving spring positioning arms 21. The two moving spring positioning arms 21 on both sides form a gap fit, and the gap of this gap fit is slightly smaller than the width of the moving spring plate 4. At the outer end of each moving spring positioning arm 21, there is an outwardly protruding moving spring connecting protrusion 22 that can be inserted into the corresponding side insertion hole of the moving spring plate 4.

[0077] In the assembly structure of the push card 2 with the base 1, the push card 2 rests on the top surface of the corresponding magnetic circuit barrier 11 (i.e., the magnetic circuit barrier between the yoke 5 and the moving spring 4) on the base 1 through its bottom surface (one side surface relative to the thickness direction of the push card 2).

[0078] To accommodate the reciprocating motion of the push card 2 on the top surface of the magnetic circuit barrier 11 and reduce frictional resistance, the bottom surface of the push card 2 has two sets of downwardly protruding displacement ribs 26. These two sets of displacement ribs 26 correspond to the positions of the two moving spring positioning arms 21 on the push card 2, and are formed along the length direction of the corresponding moving spring positioning arms 21 to the armature mating end.

[0079] More specifically, each set of displacement ribs 26 is a continuous, straight structure, protruding from the bottom surface of the push card 2 in a cylindrical shape, and is basically of equal diameter along its length; and the diameters of the two sets of displacement ribs 26 are basically the same. Typically, the end of the displacement rib 26 facing the moving spring 4 (i.e., the moving spring end) is located on the inner side of the step between the moving spring connecting protrusion 22 and the moving spring positioning arm 21, and the end of the displacement rib 26 facing the armature 3 (i.e., the armature end) is located on the end face of the push card body at the armature mating end.

[0080] To ensure that the two sets of displacement ribs 26 on the bottom surface of the push card 2 will never jam against the magnetic circuit barrier 11, the bottom surface of the push card 2 has a set of downwardly protruding guide ribs 27. The guide ribs 27 correspond to the position of the armature positioning protrusion 24 on the push card 2 and are formed along the length direction of the armature positioning protrusion 24. That is, the guide ribs 27 are formed between the two displacement ribs 26. One end of the guide ribs 27 in the length direction is staggered with the displacement ribs 26, and the other end extends beyond the end of the displacement ribs 26, forming a staggered transition fit.

[0081] More specifically, the guide rib 27 is a continuous, straight structure that protrudes from the bottom surface of the push card 2 in a cylindrical shape and has a variable diameter along its length. That is, the guide rib 27 has a variable diameter along its length, with a spring section rib 271 that intersects with the displacement rib 26 in the length direction, and an armature section rib 272 that extends beyond the displacement rib 26 in the length direction. The outer end of the spring section rib 271 extends to the inner side of the spring end of the push card 2 body, and the outer end of the armature section rib 272 extends to the inner side of the end of the armature positioning protrusion 24.

[0082] The aforementioned spring section rib 271 has a variable diameter structure along its length, gradually increasing in size from the outer end towards the armature section rib 272. The maximum diameter of the spring section rib 271 is approximately equal to (or slightly smaller than) the diameter of the displacement rib 26. Thus, when the displacement rib 26 contacts the top surface of the magnetic circuit baffle 11, the spring section rib 271 will not essentially contact the top surface of the magnetic circuit baffle 11, allowing for a smooth transition between the displacement rib 26 and the guide rib 27.

[0083] The aforementioned armature section rib 272 has a variable diameter structure along its length, gradually increasing in size from the moving spring section rib 271 towards the outer end. The minimum diameter of the armature section rib 272 is approximately equal to (or slightly larger than) the diameter of the displacement rib 26. Therefore, the maximum diameter of the armature section rib 272 must be greater than the diameter of the displacement rib 26. When the displacement rib 26 is not in contact with the top surface of the magnetic circuit retaining wall 11, the lowest point of the displacement rib 26, supported by the armature section rib 272, is higher than the top surface of the magnetic circuit retaining wall 11.

[0084] The moving spring 4 has push card insertion holes on both sides below the moving contact. Each push card insertion hole is an open structure and is C-shaped on the corresponding side of the moving spring 4.

[0085] When the push card 2 of the above structure is assembled on the base 1, the spring connecting protrusions 22 at the outer ends of the two spring positioning arms 21 are connected to the corresponding sockets in the insertion holes on both sides of the spring plate 4. The push card 2 is located on the top surface of the magnetic circuit barrier wall 11 by the two sets of displacement protrusions 26 on the bottom surface. Moreover, under the elastic pre-tightening action of the spring plate 4, the push card 2 abuts against the surface of the corresponding side yoke frame 12 on the base 1 through the base positioning protrusions 23 on both sides of the armature mating end. At this time, the spring plate 4 is basically in a natural vertical state, and the armature positioning protrusions 24 are located in the space between the two yoke frames 12, and of course, there should be no positional interference with the yoke 5. Thus, between the two base positioning protrusions 23 on both sides of the armature mating end of the push card 2 and the middle armature positioning protrusion 24, a reserved space is formed for the corresponding straddling insertion of the push card straddling groove 31 of the armature 3. This facilitates the guidance and insertion of the armature 3, simplifies the technical difficulty of armature 3 assembly, reduces insertion debris between the armature 3 and the push card 2, and is also more conducive to the automated assembly of the armature 3.

[0086] The armature 3 has a through hole for the compression spring to be inserted - namely, the compression spring through hole 33, and below the compression spring through hole 33 is the push-lock mating part.

[0087] The push-lock mating part of the armature 3 has a notch-shaped push-lock straddling groove 31 formed concavely upward from the bottom edge, that is, the push-lock straddling groove 31 is an inverted U-shaped structure with an open bottom on the armature 3. Of course, the push-lock straddling groove 31 is a non-standard inverted U-shaped structure. The U-shaped structure description here refers to its open shape. In fact, the push-lock straddling groove 31 is composed of a guide section 311 and a straddling section 312 that pass through in sequence.

[0088] More specifically, the guide segment 311 is located below the straddle segment 312. The width of the opening end (i.e., the bottom) of the guide segment 311 is greater than the width of the root end (i.e., the top), and it has a dovetail groove structure along the depth direction. Furthermore, the width of the opening end of the guide segment 311 is greater than the width of the straddle area (i.e., the root) of the aforementioned armature positioning protrusion 24. The straddle segment 312 starts from the root of the guide segment 311, and its width is sufficient to fit into the straddle area of ​​the aforementioned armature positioning protrusion 24. That is, the width of the straddle segment 312 matches the width of the straddle area of ​​the aforementioned armature positioning protrusion 24, and the depth of the straddle segment 312 matches the height of the straddle area of ​​the aforementioned armature positioning protrusion 24.

[0089] To prevent magnetic short circuits during the swinging process of the armature 3, the bottom ends of the push-card mating parts on both sides of the push-card straddling groove 31 of the armature 3 have bent protrusions 32 that are bent towards the yoke 5. The bending height and length of the bent protrusions 32 correspond to the contact between the armature 3 and the magnetic shielding structure during the swinging process (i.e., the corresponding bosses for conventional magnetic short circuit prevention). In addition, the width of the push-card mating parts on both sides of the push-card straddling groove 31 of the armature 3 corresponds to the width of the armature straddling slots 25 on both sides of the armature positioning protrusions 24. Typically, the bottom width of the push-card mating parts on both sides is significantly smaller than the width of the corresponding armature straddling slots 25, and the top width of the push-card mating parts on both sides is slightly smaller than the width of the corresponding armature straddling slots 25.

[0090] In the aforementioned assembly structure of the push card 2, the movable spring 4, and the base 1, the armature 3 is inserted into the base 1 at the outer side of the yoke 5. During the insertion process, the armature 3 straddles the armature positioning protrusion 24 of the push card 2 through the push card straddling groove 31 at the bottom. That is, under the positioning protrusions 23 on both sides of the base of the push card 2, the root of the armature positioning protrusion 24 of the push card 2 is embedded in the push card straddling groove 31 of the armature 3, and the push card mating parts on both sides of the push card straddling groove 31 of the armature 3 are correspondingly inserted into the armature straddling slots 25 on both sides of the armature positioning protrusion 24 of the push card 2. In the initial stage of the straddle insertion (i.e., the insertion stage of the bent protrusion 32 at the bottom of the armature 3), the bent protrusion 32 at the bottom of the armature 3 is inserted into the armature straddle slots 25 on both sides of the armature mating end of the push card 2, forming an insertion guide and reducing the generation of assembly debris. In the later stage of the straddle insertion (i.e., after the bent protrusion 32 at the bottom of the armature 3 is inserted and the upper part continues to be inserted downwards), the inserted armature 3 forms a pre-push against the push card 2 towards the moving spring 4. At the same time, the elastic force of the moving spring 4 acts on the armature 3 through the push card 2, forming a pre-compression effect on the armature 3, thereby effectively ensuring the insertion stability of the armature 3 and the reliability of the push card 2 during the pushing displacement process. The inserted armature 3 is pressed onto the knife edge of the yoke 5 by the compression spring inserted in the compression spring through hole 33.

[0091] The working principle of the electromagnetic relay with the above structure is as follows:

[0092] - When the pins of coil 8 are energized, the excitation current of coil 8 will generate magnetic flux. The magnetic flux forms a magnetic circuit through the iron core, armature 3, yoke 5 and working air gap, and generates electromagnetic attraction in the working air gap.

[0093] - When the excitation current rises to the set value, the electromagnetic attraction torque will overcome the counter torque of the moving spring 4, causing the armature 3 to swing outward on the yoke 5 (i.e., the bottom is away from the yoke 5).

[0094] During the outward swing, the pusher 2 is moved to the side of the moving spring 4, pushing the moving spring 4 closer to the stationary spring 6, so that the moving contact of the moving spring 4 closes with the stationary contact of the stationary spring 6.

[0095] When the excitation current decreases to the set value, the counter torque of the moving reed 4 is greater than the electromagnetic attraction torque, causing the armature 3 to swing inward (i.e., the bottom is close to the yoke 5). The armature 3 abuts against the magnetic isolation structure (e.g., a copper sheet) between the armature 3 and the yoke 5 through the bottom bend protrusion 32, returning to the initial state. The moving contact of the moving reed 4 is disconnected from the stationary contact of the stationary reed 6.

[0096] Example 2

[0097] The other contents of this embodiment are the same as those of embodiment 1, except that the push card mating part of the armature has a notch-shaped push card straddling groove with an open bottom and a basically standard inverted U-shaped structure.

[0098] In other words, the drive chute has a straight groove structure without a gradually changing guide structure.

[0099] Example 3

[0100] The other contents of this embodiment are the same as those of embodiment 1, except that: the guide ribs on the bottom surface of the push card are of equal diameter, and the diameter of the guide ribs should be at least equal to the diameter of the displacement ribs.

[0101] The above embodiments are only used to illustrate the present invention and are not intended to limit it.

[0102] 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; 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 push rod type electromagnetic relay, comprising a push card (2) and an armature (3) mounted on a base (1); The armature mating end of the push card (2) has an outwardly convex armature positioning protrusion (24). The armature (3) has a notch-shaped push-lock mounting groove (31) formed from the bottom edge. Its features are: At the bottom end of the push card mating part on both sides of the push card straddling groove (31) of the armature (3), there is a bent protrusion (32) bent towards the yoke (5) and used as abutment to the magnetic isolation structure during the swing of the armature (3). The magnetic isolation structure is set between the armature (3) and the yoke (5) to prevent magnetic short circuit between the swinging armature (3) and the yoke (5). During the assembly process of the armature (3) with the push card (2), the push card (2) is assembled with the moving spring and sits on the magnetic circuit baffle of the base (1). The armature (3) inserted downward is guided by the backbend protrusion (32) on both sides of the armature positioning protrusion (24) of the push card (2), so that the armature (3) rides on the armature positioning protrusion (24) of the push card (2) through the push card riding groove (31), and the armature positioning protrusion (24) is embedded in the push card riding groove (31).

2. The push-rod type electromagnetic relay according to claim 1, characterized in that: The push-locking slot (31) of the armature (3) is mainly composed of a guide section (311) and a straddle section (312) that pass through in sequence; The width of the opening end of the guide section (311) is greater than the width of the root end, and it has a dovetail groove structure along the depth direction. The width of the opening end of the guide section (311) is greater than the width of the straddling area of ​​the armature positioning protrusion (24). The width of the straddle section (312) is capable of being embedded in the straddle area of ​​the armature positioning protrusion (24).

3. The push-rod type electromagnetic relay according to claim 2, characterized in that: The width of the straddle section (312) matches the width of the straddle area of ​​the armature positioning protrusion (24); The depth of the straddle section (312) matches the height of the straddle area of ​​the armature positioning protrusion (24).

4. The push-rod type electromagnetic relay according to claim 1, characterized in that: The armature mating end of the push card (2) has a base positioning protrusion (23) on both sides of the armature positioning protrusion (24), and the base positioning protrusion (23) on both sides respectively forms a gap mating with the armature positioning protrusion (24); During the assembly process of the push card (2) with the base (1), the base positioning protrusions (23) on both sides of the armature mating end abut against the corresponding side yoke frame (12) on the base (1); and, in the state where the base positioning protrusions (23) on both sides abut against the corresponding side yoke frame (12), the base positioning protrusions (23) on both sides and the armature positioning protrusions (24) respectively form an armature straddle slot (25) that can be inserted into the push card mating part on both sides of the push card straddle slot (31).

5. The push-rod type electromagnetic relay according to claim 1 or 4, characterized in that: The spring-fitting end of the push card (2) has two spring-positioning arms (21) that are outwardly convex and form a spacing fit. The outer end of the moving spring positioning arm (21) has a moving spring connecting protrusion (22) that can be inserted into the corresponding side insertion hole of the moving spring plate (4).

6. The push-rod type electromagnetic relay according to claim 5, characterized in that: In the assembly structure of the push card (2) and the base (1), the push card (2) is located on the top surface of the corresponding magnetic circuit barrier (11) on the base (1); The push card (2) has two sets of protruding displacement ribs (26) on the surface that is used to cooperate with the magnetic circuit barrier (11). These two sets of displacement ribs (26) correspond to the positions of the two moving spring positioning arms (21) on the push card (2) and are formed along the length direction of the moving spring positioning arms (21) to the armature mating end.

7. The push-rod type electromagnetic relay according to claim 6, characterized in that: The push card (2) has a set of raised guide ribs (27) on the surface that is used to cooperate with the magnetic circuit barrier (11). The guide ribs (27) correspond to the position of the armature positioning protrusion (24) on the push card (2) and are formed along the length direction of the armature positioning protrusion (24). Furthermore, one end of the guide rib (27) in the length direction is interlocked with the displacement rib (26), and the other end extends beyond the end of the displacement rib (26).

8. The push-rod type electromagnetic relay according to claim 7, characterized in that: The guide rib (27) has a variable diameter structure along its length direction, and has a spring section rib (271) that intersects with the displacement rib (26) in the length direction, and an armature section rib (272) that extends beyond the displacement rib (26) in the length direction. The spring section rib (271) has a variable diameter structure along its length, gradually increasing in size from the outer end to the armature section rib (272), and the maximum diameter of the spring section rib (271) is less than or equal to the diameter of the displacement rib (26). The armature section rib (272) has a variable diameter structure along its length direction, gradually increasing in size from the moving spring section rib (271) towards the outer end, and the minimum diameter of the armature section rib (272) is greater than or equal to the diameter of the displacement rib (26).

9. The push-rod type electromagnetic relay according to claim 7 or 8, characterized in that: The displacement rib (26) is formed in a cylindrical structure on the surface of the push card (2) that serves as a cooperating magnetic circuit barrier (11), and has a constant diameter structure along the length direction; The guide rib (27) is formed in a cylindrical shape on the surface of the push card (2) that serves as a cooperating magnetic circuit barrier (11).

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