CN115332019A - Pushing component and movable conducting strip connecting structure of relay and electromagnetic relay - Google Patents

Abstract

The invention discloses a connecting structure of a pushing component and a movable conducting strip of a relay and an electromagnetic relay, wherein the connecting structure comprises the pushing component and one or more movable conducting strips, the movable conducting strips are arranged in parallel along the width direction of the movable conducting strips, and two ends of each movable conducting strip are respectively provided with a movable contact; the pushing component comprises a cover plate and a pushing main body, the cover plate is connected with the pushing main body, and the movable conducting strip is movably arranged between the cover plate and the pushing main body; one surface of the cover plate facing the movable conducting strip is provided with one or more flaky pressure springs, and the flaky pressure springs are abutted against one surface of the movable conducting strip back to the movable contact and have pre-pressure on the movable conducting strip. The invention adopts the sheet-shaped pressure spring to replace the spiral contact spring in the prior art, and has the characteristics of simple assembly, stable mechanics, simple and convenient pre-pressure adjustment and the like.

Description

Pushing component and movable conducting strip connecting structure of relay and electromagnetic relay

Technical Field

The invention relates to the field of relays, in particular to a connecting structure of a pushing component and a movable conducting strip of a relay and an electromagnetic relay.

Background

At present, an electromagnetic relay of prior art includes magnetic circuit, contact system and promotion part, magnetic circuit's the iron core that moves connects the promotion part, contact system includes two quiet conducting strips, a plurality of conducting strips that move, it sets up on the promotion part to move the conducting strip, it moves through the magnetic force that produces from the coil to move the iron core, make the promotion part drive respectively move the conducting strip motion, thereby make the movable contact that respectively moves the both ends setting of conducting strip contact or the separation with the corresponding quiet contact point that sets up on two quiet conducting strips respectively, and the contact is at contact state, realize that multiunit contact return circuit is parallelly connected. The relay applies pre-pressure to the movable conducting strip by adopting the contact spring to realize contact overtravel. However, since the contact spring is a coil spring, there are the following disadvantages: the assembly difficulty is higher during the pre-assembling of the spiral spring; the spiral spring needs to have larger initial pre-pressure and match with counter-force, the requirement on type selection is higher, and the spiral spring needs to be specially customized and is inconvenient to process.

Disclosure of Invention

The invention provides a connecting structure of a pushing component and a movable conducting strip of a relay and an electromagnetic relay aiming at the technical problems in the prior art, wherein a flaky pressure spring is adopted to replace a spiral contact spring to realize contact overtravel.

The technical scheme adopted by the invention for solving the technical problems is as follows: a connecting structure of a pushing component and a movable conducting strip of a relay comprises the pushing component and one or more movable conducting strips, wherein the movable conducting strips are arranged in parallel along the width direction of the movable conducting strips, and movable contacts are respectively arranged at two ends of each movable conducting strip; the pushing component comprises a cover plate and a pushing main body, the cover plate is connected with the pushing main body, and the movable conducting strip is movably arranged between the cover plate and the pushing main body; one or more flaky pressure springs are arranged on one surface of the cover plate facing the movable conducting plate, abut against one surface of the movable conducting plate back to the movable contact and have pre-pressure on the movable conducting plate.

Furthermore, the flaky pressure springs correspond to the movable conducting strips one to one, the flaky pressure springs are of an axisymmetrical structure, the middle parts of the flaky pressure springs are connected to the cover plate, the two ends of the flaky pressure springs are arranged along the length direction of the movable conducting strips and are respectively in sliding fit with the movable conducting strips, and the sliding direction of the flaky pressure springs is consistent with the length direction of the movable conducting strips.

Furthermore, the parts of the two ends of the flaky pressure spring, which are in sliding fit with the movable conducting strips, are respectively set as bending fillets, and the outer surfaces of the bending fillets are in contact with the movable conducting strips.

Furthermore, the movable conductive sheet is respectively provided with a sunken part at the edges at two sides of each bent fillet, the edges at two sides of each bent fillet are respectively positioned on the corresponding sunken parts, and the size of the sunken parts in the sliding direction is larger than or equal to the sliding stroke of the bent fillets; the recessed portion is a groove or a hole.

Furthermore, the cover plate is made of metal, and the flaky pressure spring is riveted on the cover plate.

Furthermore, the pushing main body comprises an insulating block and a metal part, the metal part is fixedly connected with the insulating block or is formed by insert injection, the metal part is provided with at least one U-shaped groove or at least one group of U-shaped grooves corresponding to the movable conducting strips one to one, the movable conducting strips are located between two sides of the U-shaped grooves, and the cover plate is connected to the metal part and is surrounded with the U-shaped grooves of the metal part to form a limiting frame for installing the movable conducting strips.

Furthermore, the metal part comprises two connecting sheets, the two connecting sheets are made of metal materials respectively, the two connecting sheets are fixedly connected with the insulating block or are formed by insert injection molding respectively, the two connecting sheets are arranged in parallel along the width direction of the movable conducting sheet, a plurality of supporting rods are integrally formed on the two connecting sheets respectively, the supporting rods extend towards the cover plate and are distributed at intervals along the length direction of the connecting sheets, the supporting rods of the two connecting sheets correspond to one another, and the U-shaped groove is formed between the adjacent supporting rods on the same connecting sheet; the cover plate is fixedly connected with the end part of each supporting rod.

Furthermore, the two connecting pieces are respectively injection-molded with the insulating block insert, and the parts of the two connecting pieces located in the insulating block are respectively provided with a plurality of through grooves distributed at intervals along the length direction of the insulating block, and the through grooves penetrate through two surfaces of the connecting pieces in the thickness direction.

Furthermore, U-shaped notches are respectively arranged at the positions of the movable conducting strip corresponding to the two sides of the U-shaped groove.

The invention also provides an electromagnetic relay, which comprises a base, a magnetic circuit system and two static conductive sheets, wherein the magnetic circuit system is arranged on the base and comprises a coil assembly and a movable iron core, and one part of the movable iron core is arranged in the coil assembly; the two static conductive sheets are arranged on the base in parallel; the relay also comprises a structure for connecting the pushing component and the movable conducting strip of the relay, wherein the movable iron core is connected with the pushing component, and the movable contacts arranged at the two ends of the movable conducting strip are respectively matched with the corresponding static contacts arranged on the two static conducting strips.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention adopts the sheet-shaped pressure spring as the stamping type reed to replace the contact spring in the prior art, and has the characteristics of simple processing, simple assembly, stable mechanics, simple and convenient pre-pressure adjustment and the like of the stamping type reed, thereby overcoming the defects existing in the adoption of a spiral contact spring. In addition, promote the main part and include apron and promotion main part make the installation of slice pressure spring, movable conducting strip more convenient, and, apron, movable conducting strip and slice pressure spring constitute three-layer balanced structure, can ensure the clearance uniformity of a plurality of contact groups, the uniformity of a plurality of contact actions, the uniformity of a plurality of contact pressure etc..

2. The two ends of the flaky pressure spring are in sliding fit with the movable conducting strips, so that the friction force between the flaky pressure spring and the movable conducting strips can be reduced. Particularly, the two ends of the flaky pressure spring are provided with the bent round corners, so that the sliding friction force between the flaky pressure spring and the movable conducting strip can be further reduced; the movable conducting strip is provided with the sunken part, so that the sliding friction force between the sheet pressure spring and the movable conducting strip can be further reduced, and the phenomenon that the movable conducting strip is blocked due to metal scraps generated by the friction between the edge of the bent fillet and the movable conducting strip is reduced.

3. The promotion main part includes insulating block and metal part can utilize the insulating block isolated on the one hand move the iron core and move the conducting strip, on the other hand makes to move the conducting strip and can not rub out the plastics bits with the metal part contact cooperation, has overcome prior art's promotion part whole and has been the insulating material, leads to moving the conducting strip and has rubbed out the plastics bits easily with the promotion part and cause to move the conducting strip card and die or contact failure. The metal part comprises the two connecting sheets, so that the metal part is simple in structure, less in material consumption and simple to machine.

4. The through groove is arranged, so that the two connecting pieces can still keep relative parallelism after injection molding is finished, the size consistency of the pushing part and the insert strength of the two connecting pieces are ensured, and the integral injection molding is more stable.

The invention is further explained in detail with the accompanying drawings and the embodiments; however, the connection structure of the pushing member and the movable conductive sheet of the relay and the electromagnetic relay according to the present invention are not limited to the embodiments.

Drawings

FIG. 1 is a schematic perspective view of a connection structure of a pushing member and a movable conductive sheet according to the present invention;

FIG. 2 is a front view of the connecting structure of the pushing member and the movable conductive sheet of the present invention;

FIG. 3 is a top view of the connecting structure of the pushing member and the movable conductive sheet according to the present invention;

FIG. 4 is a bottom view of the connecting structure of the pushing member and the movable conductive plate of the present invention;

FIG. 5 is a schematic view of the combination of the plate-like compression spring and the cover plate of the present invention;

FIG. 6 is an exploded schematic view of the pushing body of the present invention;

FIG. 7 is a perspective view of the pushing body of the present invention;

FIG. 8 is a schematic view of the combination of the pushing body and the movable conducting strip of the present invention;

FIG. 9 is a top view of FIG. 8;

fig. 10 is an exploded schematic view of an electromagnetic relay of the present invention;

fig. 11 is an exploded view of the contact system and magnetic circuit system of the present invention in combination with a base;

fig. 12 is a top view of an electromagnetic relay of the present invention (without the housing);

FIG. 13 isbase:Sub>A sectional view A-A of FIG. 12;

FIG. 14 is a sectional view taken along line B-B of FIG. 12;

FIG. 15 is a schematic view of the combination of the restoring spring and two position-limiting pieces of the present invention;

fig. 16 is a schematic view showing a combination of the restoring spring, the plate-like pressing spring and the cover plate according to the present invention;

fig. 17 is a cross-sectional view of yet another magnetic circuit system of the present invention;

fig. 18 is a cross-sectional view of yet another magnetic circuit system of the present invention;

fig. 19 is a cross-sectional view of yet another magnetic circuit system of the present invention;

FIG. 20 is a graph of electromagnetic attraction of several magnetic circuit systems of the present invention;

the magnetic circuit device comprises a base 1, a base 11, a separation cavity 12, a groove 13, a magnetic circuit cavity 14, a contact cavity 15, a pushing cavity 16, a limiting part 17, a limiting block 171, a convex part 18, a positioning cavity 2, a shell 3, a magnetic circuit system 31, a movable iron core 311, an annular step surface 312, a hanging table 313, a boss 32, an annular iron core 33, a coil 34, a bobbin 35, a U-shaped yoke iron 36, a yoke iron plate 4, a static conductive sheet 41, a static contact 5, a movable conductive sheet 51, a movable contact 52, a groove 53, a U-shaped notch 6, a pushing part 61, a cover plate 62, an insulating block 621, a convex part 622, a hanging groove 63, a connecting sheet 631, a support rod 632, a limiting step 7, a restoring reed 71, a bending fillet 72, a bending part 8, a sheet-shaped pressure spring 81, a bending fillet 9, a limiting sheet 91 and a groove.

Detailed Description

In the description, the directions or positional relationships indicated by "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the scope of the present invention. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone.

Referring to fig. 1-9, the structure for connecting a pushing component and a movable conducting strip of a relay according to the present invention includes a pushing component 6 driven by a movable iron core 31 of the relay, and one or more movable conducting strips 5, where the plurality of movable conducting strips 5 are arranged in parallel along a width direction thereof, the movable conducting strips 5 are movably disposed on the pushing component 6 along a thickness direction thereof, and two ends of the movable conducting strips 5 are respectively provided with a movable contact 51. Specifically, the pushing component 6 comprises a cover plate 61 and a pushing main body, the cover plate 61 and the pushing main body are connected together, and the movable conducting strip is movably arranged between the cover plate 61 and the pushing main body; one or more sheet-shaped pressure springs 8 are installed on one surface of the cover plate 61 facing the movable conducting plate, the sheet-shaped pressure springs 8 correspond to the movable conducting plates 5 one by one, and the sheet-shaped pressure springs 8 abut against one surface of the movable conducting plate 5 back to the movable contact 51 and have pre-pressure on the movable conducting plate 5.

In this embodiment, the plate-shaped pressure spring 8 has an axisymmetrical structure, the middle portion of the plate-shaped pressure spring 8 is connected to the cover plate 61, and both ends of the plate-shaped pressure spring 8 are arranged along the length direction of the movable conductive plate 5 and are respectively in sliding fit with the movable conductive plate 5, and the sliding direction is consistent with the length direction of the movable conductive plate 5. As shown in fig. 5, the portions of the two ends of the plate-shaped pressure spring 8, which are in sliding fit with the movable conductive sheet 5, are respectively provided with a bending fillet 81, and the outer surface of the bending fillet 81 is in contact with the movable conductive sheet 5, as shown in fig. 3; the movable conducting strip 5 is provided with a recessed portion at each edge on two sides of each bending fillet 81, each edge on two sides of each bending fillet 81 is located on a corresponding recessed portion, the recessed portion is specifically a groove 52, as shown in fig. 3 and 9, and the size of the groove 52 in the sliding direction is greater than or equal to the sliding stroke of the bending fillet 81. In other embodiments, the recess is a hole penetrating through both ends of the movable conductive sheet in the thickness direction. The part between the two ends of the flaky pressure spring 8 and the middle part thereof is in an inclined state, so that the flaky pressure spring 8 is approximately in an arc shape.

In this embodiment, two grooves 52 are respectively disposed at positions on the movable conducting strip 5, which are matched with two ends of the sheet-shaped pressure spring 8. All edges of the contact position of the flaky pressure spring 8 are positioned on the groove 52, so that when the flaky pressure spring 8 is contacted, the edges directly scrape the surface of the conductive sheet 5 to generate metal chips, and the generation of the metal chips can block the sliding of the flaky pressure spring 8 and even block the flaky pressure spring. Because the sheet-shaped pressure spring 8 continues to slide towards two sides in the stress process, the length of the groove 52 needs to cover the whole movement stroke of the sheet-shaped pressure spring 8. On one hand, after the groove on the movable conducting strip 5 is punched, the periphery of the groove 52 is in fillet transition, no obvious edge and pressure spring friction exists, and even if metal chips are generated, the metal chips can be hidden in the groove 52 and cannot be accumulated to cause jamming. The flexible sliding of the flaky pressure spring 8 and the movable conducting strip 5 can ensure the motion consistency of a plurality of groups of contact sets, and a better balance effect is achieved.

In this embodiment, the pushing component 6 includes a cover plate 61 and a pushing body, the pushing body is fixedly connected to the movable iron core 31, the cover plate 61 is installed on a side of the pushing body opposite to the movable iron core 31, and the movable conducting strip 5 is movably installed between the cover plate 61 and the pushing body; the restoring reed 7 is connected to one surface of the cover plate 61 back to the movable conducting strip 5, and the flaky pressure spring 8 is connected to one surface of the cover plate 61 facing the movable conducting strip 5. Specifically, the cover plate 61 is made of metal, and the middle part of the sheet-shaped pressure spring 8 is riveted to the cover plate 61, as shown in fig. 5.

In this embodiment, the promotion main part includes insulating block 62 and metal parts, metal parts and insulating block 62 insert injection moulding, just metal parts be equipped with move conducting strip 5 one-to-one and along moving a plurality of U type grooves or multiunit U type groove that the width direction of conducting strip 5 was arranged side by side, every group U type groove includes along move two at least U type grooves that the length direction of conducting strip 5 was arranged side by side, move conducting strip 5 and be located between the both sides in U type groove, apron 61 is connected in metal parts to enclose with metal parts's U type groove and be used for installing move the spacing frame of conducting strip 5. In other embodiments, the metal part is fixedly connected to the insulating block.

In this embodiment, as shown in fig. 6 and 7, the metal part includes two connecting pieces 63, the two connecting pieces 63 are made of metal respectively, the two connecting pieces 63 are insert-molded with the insulating block 62 respectively, and the two connecting pieces 63 are arranged in parallel along the width direction of the movable conducting piece 5. The portions of the two connecting pieces 63 located in the insulating block 62 are respectively provided with a plurality of through grooves 633 distributed at intervals along the length direction thereof, and the through grooves 633 penetrate through two surfaces of the connecting pieces 63 in the thickness direction, as shown in fig. 9. In the injection molding process, plastic enters the through groove 633, and the connecting sheet 63 is partially wrapped in the plastic, so that the strength of the insert of the connecting sheet 63 is higher, and the displacement size change of the connecting sheet 63 is small after the connecting sheet is stressed. If connection piece 63 does not set up logical groove 633, then in the engineering of moulding plastics, because the plastics in the middle of two connection pieces 63 and the plastic construction in the outside are inequality, and do not communicate, the pressure that leads to intermediate position and both sides to receive in the solidification process is different, easily cause connection piece 63 crooked, and through leading to groove 633 design back, lead to groove 633 with the middle plastics passageway direct draw-through in the outside, the atress is balanced, make the in-process pressure of moulding plastics more balanced, two connection pieces 63 still can keep relative parallel after the completion of moulding plastics, guarantee to promote the size uniformity of main part and the inserts intensity of two connection pieces 63, let integrative injection moulding more stable. In other embodiments, the two connecting pieces are integrally formed.

In this embodiment, the two connecting pieces 63 are respectively integrally formed with a plurality of supporting rods 631, the supporting rods 631 extend toward the cover plate 61 and are distributed at intervals along the length direction of the connecting pieces 63, the supporting rods 631 of the two connecting pieces are in one-to-one correspondence, and the adjacent supporting rods on the same connecting piece form the U-shaped groove; every two corresponding U-shaped grooves of the two connecting sheets 63 respectively form a group of U-shaped grooves. The cover plate 61 is fixedly connected with the end parts of the support rods 631, specifically, the cover plate 61 is riveted and fixed with the end parts of the support rods 631, and the end parts of the support rods 631 are respectively provided with a limit step 632 in contact fit with the inner side surface of the cover plate 61. The U-shaped groove forms a guide groove of the movable conducting strip 5, U-shaped notches 53 are respectively arranged at positions of the movable conducting strip 5 corresponding to two sides of the U-shaped groove, as shown in fig. 9, the width of each U-shaped notch 53 is slightly larger than the thickness of the connecting sheet 63, and the U-shaped notches have certain depth, so that certain gaps are formed at the matching positions of the movable conducting strip 5 and the connecting sheet 63 in the left-right direction and the up-down direction, and the function of limiting the movable conducting strip 5 can be achieved.

According to the connecting structure of the pushing component and the movable conducting strip of the relay, the flaky pressure spring 8 is adopted to replace a contact spring in the prior art, and the connecting structure has the characteristics of simplicity in processing, simplicity in assembly, stability in mechanics, simplicity and convenience in pre-pressure adjustment and the like. The flaky pressure spring 8 and the movable conducting strip 5 adopt a low-friction sliding type structure, the groove 52 is formed in the movable conducting strip 5, the sliding friction force is greatly reduced in the stress and recovery process of the flaky pressure spring 8, and the phenomenon that the movable conducting strip 5 is blocked due to metal scraps generated by the friction between the edge of the flaky pressure spring 8 and the movable conducting strip 5 is prevented.

Referring to fig. 1-20, an electromagnetic relay according to the present invention includes a base 1, a housing 2, a magnetic circuit system 3, two static conductive sheets 4, and a connecting structure between a pushing component and a moving conductive sheet of the relay according to the present invention. The magnetic circuit system 3 is arranged on the base 1, the magnetic circuit system 3 comprises a coil assembly and a movable iron core 31, the movable iron core 31 is connected with the insulating block 62 of the pushing component 6, and a part of the movable iron core 31 is arranged in the coil assembly; the two static conductive sheets 4 are installed on the base 1 in parallel, and the movable contacts 51 arranged at the two ends of the movable conductive sheet 5 are respectively matched with the corresponding static contacts 41 arranged on the two static conductive sheets 4. Specifically, the two static conductive sheets 4 are located between the dynamic conductive sheet 5 and the magnetic circuit system 3, the two static conductive sheets 4 are respectively erected on the base 1 and are arranged side by side from left to right, the plurality of dynamic conductive sheets 5 are arranged side by side along the length direction (i.e., the vertical direction) of the static conductive sheet 4, and the length direction of each dynamic conductive sheet 5 is consistent with the width direction of the static conductive sheet 4. The bottom end of the shell 2 is open and is connected with the base 1 in a buckling way, and the magnetic circuit system 3, the contact system and the pushing component 6 are contained in the shell cavity of the shell. The static conductive sheet 4 and the static contact 41 thereon, and the movable conductive sheet 5 and the movable contact 51 thereon constitute the contact system.

In this embodiment, a restoring spring 7 is installed on the pushing member 6, and the restoring spring 7 abuts against a limiting portion disposed on the base 1 to provide the pushing member 6 and the movable iron core 31 with restoration. The number of the return springs 7 is not limited to one.

In this embodiment, as shown in fig. 10, 12, and 15, the limiting portion includes two limiting pieces 9 arranged in parallel along the length direction of the movable conducting strip 5, the restoring spring 7 is of an axisymmetric structure, the middle portion of the restoring spring 7 is connected to the pushing member 6, two ends of the restoring spring 7 are respectively in one-to-one sliding fit with the two limiting pieces 9, and the sliding direction is the same as the length direction of the movable conducting strip 5. In other embodiments, the restoring spring plate abuts against the coil assembly, and specifically, two ends of the restoring spring plate respectively abut against the following yoke plates and are in sliding fit with the yoke plates.

In this embodiment, the portions of the two ends of the restoring spring 7, which are in sliding fit with the limiting piece 9, are respectively set as bending fillets 71, and the outer surfaces of the bending fillets 71 are in contact with the limiting piece 9; the two limiting pieces 9 are respectively provided with a concave part at the edges at the two sides of each bending fillet, and the edges at the two sides of each bending fillet are respectively positioned on the corresponding concave parts. The recess is specifically a groove 91, and the size of the recess in the sliding direction is greater than or equal to the sliding stroke of the bending fillet 71. In other embodiments, the recessed portion is a hole penetrating through both ends of the stopper piece in the thickness direction.

In this embodiment, a bending portion 72 is respectively disposed between the two ends and the middle portion of the restoring spring 7, and the bending portion 72 is arched toward a side away from the movable conducting strip 5 and is substantially in an arch shape. The limiting piece 9 is made of metal materials, so that the sliding friction force between the restoring reed 7 and the limiting piece 9 is smaller, and plastic scraps cannot be scraped. The restoring reed 7 is large in width, and two ends of the restoring reed are respectively in forked arrangement, so that the bending fillet 71 is forked into at least two small bending fillets. So, make the both ends of restoring the reed 7 respectively with two spacing pieces 9 formation multiple spot contact's effect, the problem of the single point contact that the contact surface is uneven to cause is flattened on the one hand, every forked edge of on the other hand cooperates with the recess 91 of spacing piece 9 respectively, except preventing that the edge scraping from producing the metal fillings, has also guaranteed the stability of restoring the reed 7 counter-force and smooth and easy of motion. The groove 91 on the limiting sheet 9 requires the edge to be subjected to fillet treatment. In other embodiments, the limiting piece is integrally formed with the base.

The restoring reed 7 and the limiting piece 9 adopt a sliding type structure with low friction force, a groove 91 is formed in the limiting piece 9, the stress of the restoring reed 7 and the sliding friction force greatly reduced in the restoring process are reduced, and the situation that the edge of the restoring reed 7 and the limiting piece 9 rub to generate metal scraps to cause the clamping of the movable conducting strip 5 is avoided.

In this embodiment, the restoring spring 7 is riveted to a surface of the cover plate 61 facing away from the movable conductive plate 5, and the restoring spring 7 is located at a middle position of the cover plate 61, as shown in fig. 16, in other embodiments, the restoring spring is connected to a surface of the pushing body (specifically, an insulating block described below) facing the coil assembly, and abuts against the coil assembly (specifically, a yoke iron plate described below).

In this embodiment, the portion of the movable iron core 31 outside the coil assembly is fixedly connected with an annular iron core 32, the annular iron core 32 is coaxially arranged with the movable iron core 31, the outer diameter of the annular iron core 32 is greater than the diameter of the movable iron core 31, and the annular iron core 32 is located between the pushing component 6 and the coil assembly. Specifically, the annular iron core 32 is sleeved outside the movable iron core 31 in an interference manner, the movable iron core 31 is provided with an annular step surface 311 which faces away from the coil assembly, and the annular step surface 311 limits the annular iron core 32. In other embodiments, the annular core 32 is integrally formed with the plunger 31, as shown in fig. 17. In other embodiments, the plunger 31 is not provided with the annular core 32, as shown in fig. 18 and 19. The annular iron core 32 and the movable iron core 31 are arranged separately, so that the movable iron core 31 is easier to machine and form. The annular iron core 32 is sleeved outside the movable iron core 31 in an interference manner, so that the annular iron core 32 and the movable iron core 31 are connected simply and conveniently.

In the present embodiment, the coil assembly includes a coil 33, a bobbin 34, and a yoke, the coil 33 being wound around the bobbin 34, the yoke surrounding the bobbin 34 and the coil 33 and being disposed on a magnetic path formed by the coil 33; the bobbin 34 has a hole extending in the axial direction of the coil 33, and a part of the movable iron core 31 passes through the yoke and enters the hole of the bobbin 34 from one axial end of the bobbin 34; the yoke is fixedly connected with a static iron core 37, and the static iron core 37 enters the hole of the bobbin 34 from the other axial end of the bobbin 34 and is correspondingly matched with the movable iron core 31; the toroidal core 32 is located outside the yoke. When the movable iron core 31 is attracted with the static iron core 37, a gap is formed between the annular iron core 32 and the magnetic yoke, so that the movable iron core 31 and the static iron core 37 are prevented from being attracted in place due to over-positioning. The yoke specifically includes a U-shaped yoke 35 and yoke plates 36, both sides of the U-shaped yoke 35 extend toward the axial direction of the coil 33, and the yoke plates 36 are connected at both ends of the U-shaped yoke 35; a part of the movable iron core 31 passes through the yoke plate 36 and enters the hole of the bobbin 34, and the stationary iron core 37 is fixedly connected to the bottom edge of the U-shaped yoke 35. When both ends of the restoring spring 7 are respectively slidably fitted to the yoke plates 36, the middle portions of the restoring spring 7 are respectively fixedly connected to the insulating blocks 62.

In this embodiment, as shown in fig. 14, a boss 313 with a diameter gradually decreasing from the movable iron core 31 to the stationary iron core 37 is disposed at one end of the movable iron core 31 facing the stationary iron core 37, and a groove 371 adapted to the boss 313 is disposed at one end of the stationary iron core 37 facing the movable iron core 31. In other embodiments, the engaging surfaces of the movable core 31 and the stationary core 37 are flat surfaces, as shown in fig. 19. The movable core 31 not provided with the annular core 32 may be provided with the boss 313 at an end facing the stationary core 37, as shown in fig. 18, or may be provided with a flat surface, as shown in fig. 19. The movable iron core 31 is provided with a hanging table 312 at one end matched with the pushing component 6, the insulating block 62 is provided with a hanging groove 622, and the hanging table 312 is matched with the hanging groove 622 in a hanging manner.

In this embodiment, as shown in fig. 11 and 12, the base 1 is provided with another limiting portion 16 on a side of the annular iron core 32 facing the pushing member 6, and the limiting portion 16 is opposite to the annular iron core 32 and limits a maximum stroke of the movable iron core 31 and the annular iron core 32 moving in the direction of the pushing member 6.

In this embodiment, as shown in fig. 11 and 12, the base 1 is provided with a limiting structure on one side of the two ends of the movable conducting strip 5, which faces away from the static conducting strip 4, respectively, and the limiting structure limits the maximum stroke of the movable conducting strip 5 moving in the direction away from the static conducting strip 4. The limiting structure specifically comprises a limiting block 17, a convex portion 171 opposite to the movable conducting strip 5 is arranged on one surface of the limiting block 17 facing the movable conducting strip 5, and in a state that the movable contact is disconnected from the stationary contact, the convex portion 171 is in contact with the movable conducting strip or a gap is left between the convex portion 171 and the movable conducting strip. The gap is left because of the problem of processing precision, and when the limiting part 16 contacts with the annular iron core 32, the limiting structure cannot be simultaneously ensured to contact with the movable conducting strip 5.

In this embodiment, the movable portion (the movable iron core 31, the pushing component 6, and the movable conducting strip 5) of the electromagnetic relay of the present invention adopts a double-limiting structure of main limiting and auxiliary limiting, and the main limiting limits the separation state of the movable iron core 31 and the static iron core 37 in a manner that the annular iron core 32 on the movable iron core 31 is in contact with a whole large surface of the limiting portion 16 arranged on the base 1, so as to improve the impact resistance and drop resistance of the product. This is because the movable core part has a heavy weight, and if the movable core part is not limited, the movable core part may be moved excessively in the releasing direction in case of falling or impact of the product, which may cause the pushing member and the movable conductive plate to be impacted, thereby causing deformation and damage. The auxiliary limit of the invention to the movable part is as follows: the two ends of the movable conducting plate 5 are respectively matched with the limiting block 17 with the convex part 171, which is arranged on the base 1, so that the product is limited when falling and impacting, the movement of the movable conducting plate 5 along the contact separation direction is limited, meanwhile, the kinetic energy generated in the falling and impacting processes is consumed when colliding with the base 1, the movement displacement of the movable conducting plate 5 is very small when falling and impacting, and the deformation of the sheet-shaped pressure spring 8 caused by overlarge deformation is prevented. This is because each structure of the movable conducting strip 5 is under the action of the pressure of the flaky pressure spring 8, one side of the structure is tightly attached to the two connecting sheets 63, and the structure cannot move continuously, and the other side is the flaky pressure spring 8, when there is an impact force towards the contact separation direction, the movable conducting strip 5 can compress the flaky pressure spring 8, if the impact force is not limited, the flaky pressure spring 8 is easily deformed permanently, so that the pre-pressure of the flaky pressure spring 8 is reduced, the balance and consistency of multiple loops of the product are affected, and the impact resistance and the drop resistance of the product are reduced.

In this embodiment, as shown in fig. 11, the base 1 is provided with a gap 11 and/or a groove 12 at a position between each static conductive sheet 4 and the magnetic circuit system 3, respectively, so as to increase the creepage distance between the magnetic circuit system 3 and the contact system. The compartment 11 has four peripheral walls, and the grooves 12 are located on the peripheral side walls of the base 1 and extend through both sides of the side walls in the thickness direction. After the base 1 is additionally provided with the separated cavity 11 and the groove 12, the creepage distance between the magnetic circuit system 3 and the contact system can reach more than 16mm, the creepage distance is large, and the insulating property is high. If the base 1 is not provided with the separation cavity 11, the magnetic circuit system 3 is directly connected to the static conductive sheet 4 along the base 1, and the creepage distance is short; if the design of the groove 12 is not added, the magnetic circuit system 3 will reach the static conductive sheet 4 along the edge of the base 1, and the creepage distance is short.

In this embodiment, as shown in fig. 11, the base 1 is provided with a magnetic circuit cavity 13, two contact cavities 14 and a pushing cavity 15, the magnetic circuit system 3 is installed in the magnetic circuit cavity 13 from top to bottom, the two contact cavities 14 are arranged in parallel, the two static conductive sheets 4 are respectively installed in the two contact cavities 14 from top to bottom, the pushing cavity 15 is located between the two contact cavities 14 and is mutually communicated with the two contact cavities 14 and the magnetic circuit cavity 13, and the pushing component 6 is installed in the pushing cavity 15 from top to bottom. The base 1 is provided with the compartment 11 and the groove 12 between each contact chamber 14 and the magnetic circuit chamber 13, respectively, the groove 12 being located at the edge of the side wall of the base 1. The base 1 is further provided with two positioning cavities 18 for positioning the two limiting pieces 9. The base 1 adopts the design of branch chamber, and the whole assembly direction is unanimous, and the assembly is simple.

In this embodiment, one or more protrusions 621 are respectively disposed on the side surfaces of the insulating block 62 corresponding to the inner surfaces of the push cavity 15, and the protrusions 621 are in clearance fit with the inner surfaces of the push cavity 15. The surface of the convex part 621 is a cambered surface with a large radius. The convex part 621 can reduce the gap between the pushing component 6 and the base 1 when moving, so that the moving process of the pushing component 6 is more stable, and multiple groups of the pushing components are more balanced; if the convex portion 621 is not increased but only the gap fit is reduced, the pushing member 6 is likely to interfere with the base 1 after the fit gap is reduced, and there is a risk of being locked or stuck.

The electromagnetic relay comprises a structure for connecting the pushing component and the movable conducting strip of a large-current relay with a plurality of groups of parallel direct-acting iron core structures and the electromagnetic relay. Specifically, the invention has three contact groups of parallel loops, and the movable contact 41 group and the static contact 41 group form a five-layer parallel multi-loop flow balance contact group structure. Five layers of parallel type multi-circuit through-flow balanced contact group structure can effectively solve the uniformity of multiunit contact group, the equilibrium problem, through five layers of parallel type contact structures, can guarantee the clearance uniformity of a plurality of contact groups, the uniformity of a plurality of contact actions, the uniformity of a plurality of contact pressure, the through-flow uniformity of a plurality of contact return circuits, it is parallelly connected through the balanced return circuit of this structural a plurality of through-flows, divide into the parallelly connected mode of multichannel undercurrent with the electric current of originally all the way, very big reduction the generating heat of whole return circuit, reduce the product temperature rise, improve the product load capacity.

For example, if the multi-circuit parallel connection is not adopted, assuming that the circuit current is I and the contact resistance of each circuit is R, the heating power of the whole circuit is:

P＝I ² R

when the three-loop through-flow balance structure is adopted, the current of each loop is I/3, and the heating power of the whole electrified loop is as follows:

namely:

the whole heat generation is one third of that of the structure without adopting a multi-loop parallel connection structure.

The first layer of the contact group structure is the two static conductive sheets 4 which are fixed on the base 1, and the two static conductive sheets 4 which are symmetrical left and right are positioned on the same plane, so that the static contacts 41 of the multi-loop are also positioned on the same plane. The second layer to the fifth layer of the contact group structure are all supported by the pushing body, the second layer of the contact group structure is the plurality of movable conducting strips 5, the two connecting pieces 63 of the pushing body provide support, and the plurality of movable conducting strips 5 are positioned on the same plane, so that the movable contacts 51 of the multiple loops are all positioned on the same plane. The third layer of the contact set structure is the plurality of flaky pressure springs 8, and the fourth layer is the cover plate 61. After the arch-shaped flaky pressure spring 8 structure with double stress points on the third layer and the flat cover plate 61 on the fourth layer are combined together, the flat cover plate 61 on the fourth layer is riveted on the limiting steps of the two connecting pieces 63. The flat cover plate 61 is provided with a plurality of same double-stress-point sheet-shaped pressure springs 8, the middle parts of the sheet-shaped pressure springs 8 are a plane, two holes are formed in the plane and matched with two bulges on the cover plate 61, the middle planes of the sheet-shaped pressure springs 8 are attached to the flat cover plate 61, the middle planes of the sheet-shaped pressure springs 8 are pressed on the flat cover plate 61, and the middle planes of the sheet-shaped pressure springs 8 are located on the same plane. The cover plate 61 is provided with a plurality of holes matched with the support rods 631 of the two connecting sheets 63, the limiting steps on the support rods 631 enable the surface of the cover plate 61 to be parallel to a plane formed by the U-shaped grooves of the connecting sheets 63, and the cover plate 61 is arranged on the two connecting sheets 63 and then riveted and fixed on the protruding parts of the support rods 631, so that the deformation of the flaky pressure springs 8 is consistent, and the pre-pressures of a plurality of contact sets are consistent. After the sheet-shaped compression springs 8 and the cover plate 61 are assembled, two ends of each sheet-shaped compression spring 8 are respectively pressed on the corresponding movable conducting strips 5, and the surfaces of the movable conducting strips 5 are attached to a plane formed by the bottoms of the U-shaped grooves of the connecting sheets 63. The symmetrical double force application points of the sheet-shaped pressure spring 8 are matched with double support positions formed by the U-shaped grooves of the two connecting sheets 63, so that the movable conducting strip 5 can be reliably contacted with the bottom edges of the U-shaped grooves of the two connecting sheets 63, the lamination is good, and the balance of a plurality of groups of contact sets is ensured.

The fifth layer of the contact group structure is a double-bent restoring reed 7, the middle part of the restoring reed 7 is a plane and is attached to the cover plate 61, two holes in the middle of the restoring reed 7 are riveted and fixed with two convex bracts on the cover plate 61, and the left side and the right side of the restoring reed are erected on two limiting pieces 9 arranged on the base 1. The invention adopts the sheet-shaped restoring reed 7, the adjustment of the counterforce characteristic is simple, and the left side and the right side are respectively provided with one bend, so that the stress of the restoring reed 7 can be effectively reduced, and the fatigue resistance of the restoring reed 7 is improved; through the symmetrical structure of the left side and the right side, the resultant force of the counter force is ensured to be consistent with the movement direction of the magnetic circuit in the position direction of the middle shaft, the stress is balanced, and the counter force stability is good.

When the coil 33 is excited, the movable iron core 31 moves towards the direction of the static iron core 37 under the action of electromagnetic attraction, the movement of the movable iron core 31 drives the pushing component 6 and the movable conducting strip 5 on the pushing component to move towards the contact direction, the movable iron core 31 continues to move after the movable contact 51 is contacted with the static contact 41, the sheet-shaped pressure spring 8 is further deformed, the generated force acts on two sides of the movable conducting strip 5 to provide dynamic closing pressure for the contacts, and the relay is in a reliable attraction state when the movement stops after the movable iron core 31 is attached to the static iron core 37. When moving contact 51 just contacted with stationary contact 41, can make stationary contact 41 steady contact under the effect of the pre-compaction force of slice pressure spring 8, along with the continuation motion of moving iron core 31, move conducting strip 5 along the direction motion of connection piece 63 to the contact separation to compress slice pressure spring 8, slice pressure spring 8 compression back is to both sides slip deformation, produces bigger pressure to the contact, guarantees contact reliability, reduces contact resistance.

When the coil 33 is deenergized, the movable iron core 31, the pushing component 6 and the movable conducting strip 5 on the pushing component are driven to move towards the direction far away from the static iron core 37 under the action of the restoring counter force generated by the restoring reed 7, when the annular iron core 32 on the movable iron core 31 touches the limit on the base 1, the movement is stopped, and the relay is in a reliable release state.

According to the electromagnetic relay, the annular iron core 32 arranged on the movable iron core 31 forms a 'cap' structure of the movable iron core 31, so that the electromagnetic attraction of a product can be integrally improved, the counter force of the restoring reed 7 of the product and the pressure of the flaky pressure spring 8 are improved, and the product has better drop resistance and impact resistance.

The invention uses CAE simulation software to carry out electromagnetic attraction simulation analysis on three magnetic circuit systems 3, namely a plane movable iron core 31 without an annular iron core (as shown in figure 19), a movable iron core 31 without an annular iron core with a boss 313 (as shown in figure 18), and a movable iron core 31 with an annular iron core 32 and a boss 313 under the same condition, wherein the simulation result is shown in figure 20, a curve I is an electromagnetic attraction curve corresponding to the plane movable iron core 31 without an annular iron core, a curve II is an electromagnetic attraction curve corresponding to the movable iron core 31 without an annular iron core with a boss 313, and a curve III is an electromagnetic attraction curve corresponding to the movable iron core 31 with an annular iron core 32 and a boss 313:

it is obvious from the above simulation results that:

an initial stage: the electromagnetic attraction of the feature of the tapered boss 313 added at the head of the movable iron core 31 is obviously improved compared with the electromagnetic attraction without the tapered boss 313, and the electromagnetic attraction of the magnetic circuit system 3 of the movable iron core 31 with the annular iron core 32 and the boss 313 is more than the electromagnetic attraction of the magnetic circuit system 3 of the movable iron core 31 without the annular iron core and the boss 313 is more than the electromagnetic attraction of the magnetic circuit system 3 of the planar movable iron core 31 without the annular iron core 32;

middle section: the electromagnetic attraction force of the magnetic circuit system 3 of the movable iron core 31 without the annular iron core with the boss 313 is smaller and smaller as the displacement of the movable iron core 31 is reduced, and the electromagnetic attraction force of the magnetic circuit system 3 of the planar movable iron core 31 without the annular iron core is smaller at the beginning of 0.65mm displacement of the movable iron core 31; the electromagnetic attraction of the magnetic circuit system 3 of the movable iron core 31 with the annular iron core 32 and the lug boss 313 is higher than that of other two structures at different displacement points of the movable iron core 31;

end (movable iron core 31 displaced by 0 mm): the electromagnetic attraction of the magnetic circuit system 3 of the movable iron core 31 with the annular iron core 32 and the lug boss 313 is far greater than that of other two structures, so that enough electromagnetic attraction can be provided, the pressure of the flaky pressure spring 8 is further improved, and the contact has enough pressure.

In summary, after the movable iron core 31 is designed with the tapered boss 313, the electromagnetic attraction force at the initial section rises obviously, but the attraction force at the final section also falls obviously; by adding a cap structure (namely the annular iron core 32) on the movable iron core 31, the electromagnetic attraction curve can be integrally promoted, and the problem of the reduction of the electromagnetic attraction at the tail section caused by the movable iron core 31 with the conical boss 313 is solved while the electromagnetic attraction at the initial section is promoted. The electromagnetic attraction of the magnetic circuit system 3 is integrally promoted, so that the pushing component of the relay, the connecting structure of the movable conducting strip and the integral counter force (including the counter force of the recovery reed 7 and the pressure of the flaky pressure spring 8) of the electromagnetic relay are synchronously promoted, and the falling resistance and impact resistance of the product are effectively promoted. In addition, the movable part of the invention adopts a double limiting structure of the main limiting and the auxiliary limiting, thereby further improving the shock resistance and the drop resistance of the product.

The invention relates to a connecting structure of a pushing component and a movable conducting strip of a relay and an electromagnetic relay, wherein the irrelevant part is the same as or can be realized by adopting the prior art.

The above embodiments are only used to further describe the connection structure of the pushing member and the movable conducting plate of the relay and the electromagnetic relay, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. A structure for connecting a pushing component and a movable conducting strip of a relay comprises the pushing component and one or more movable conducting strips, wherein the movable conducting strips are arranged in parallel along the width direction of the movable conducting strips, and movable contacts are respectively arranged at two ends of each movable conducting strip; the method is characterized in that: the pushing component comprises a cover plate and a pushing main body, the cover plate is connected with the pushing main body, and the movable conducting strip is movably arranged between the cover plate and the pushing main body; one surface of the cover plate facing the movable conducting strip is provided with one or more flaky pressure springs, and the flaky pressure springs are abutted against one surface of the movable conducting strip back to the movable contact and have pre-pressure on the movable conducting strip.

2. The relay pushing member and moving conductive sheet connecting structure according to claim 1, wherein: the flaky pressure spring is in one-to-one correspondence with the movable conducting strips, the flaky pressure spring is of an axial symmetry structure, the middle part of the flaky pressure spring is connected to the cover plate, the two ends of the flaky pressure spring are arranged along the length direction of the movable conducting strips and are respectively in sliding fit with the movable conducting strips, and the sliding direction of the flaky pressure spring is consistent with the length direction of the movable conducting strips.

3. The relay pushing member and moving conductive sheet connecting structure according to claim 2, characterized in that: the parts, matched with the movable conducting strips in a sliding mode, of the two ends of the flaky pressure spring are respectively provided with bending fillets, and the outer surfaces of the bending fillets are in contact with the movable conducting strips.

4. The relay pushing member and moving conductive sheet connecting structure according to claim 3, wherein: the movable conductive sheet is provided with a concave part at each edge on two sides of each bending fillet, each edge on two sides of each bending fillet is positioned on the corresponding concave part, and the size of the concave part in the sliding direction is larger than or equal to the sliding stroke of the bending fillet; the recessed portion is a groove or a hole.

5. The relay pushing member and moving conductive sheet connecting structure according to claim 1, wherein: the cover plate is made of metal, and the flaky pressure spring is riveted on the cover plate.

6. The relay pushing member and moving conductive sheet connecting structure according to claim 1, wherein: the pushing main body comprises an insulating block and a metal part, the metal part is fixedly connected with the insulating block or is formed by insert injection, the metal part is provided with at least one U-shaped groove or at least one group of U-shaped grooves corresponding to the movable conducting strips in a one-to-one mode, the movable conducting strips are located between two sides of the U-shaped grooves, and the cover plate is connected to the metal part and is surrounded with the U-shaped grooves of the metal part to form a limiting frame for installing the movable conducting strips.

7. The relay pushing member and moving conductive sheet connecting structure according to claim 6, wherein: the metal part comprises two connecting sheets, the two connecting sheets are made of metal materials respectively, the two connecting sheets are fixedly connected with the insulating block or are formed by insert injection molding respectively, the two connecting sheets are arranged in parallel along the width direction of the movable conducting sheet, a plurality of supporting rods are integrally formed on the two connecting sheets respectively, the supporting rods extend towards the cover plate direction and are distributed at intervals along the length direction of the connecting sheets, the supporting rods of the two connecting sheets correspond to one another, and the U-shaped groove is formed between the adjacent supporting rods on the same connecting sheet; the cover plate is fixedly connected with the end part of each supporting rod.

8. The structure for connecting a push member and a movable conductive sheet of a relay according to claim 7, characterized in that: the two connecting pieces are respectively formed by injection molding with the insulating block insert, the parts of the two connecting pieces located in the insulating block are respectively provided with a plurality of through grooves distributed at intervals along the length direction of the insulating block, and the through grooves penetrate through two surfaces of the connecting pieces in the thickness direction.

9. The structure for connecting a push member and a movable conductive sheet of a relay according to any one of claims 6 to 8, wherein: and U-shaped notches are respectively arranged at the corresponding positions of the movable conducting strip and the two sides of the U-shaped groove.

10. An electromagnetic relay comprises a base, a magnetic circuit system and two static conducting strips, wherein the magnetic circuit system is arranged on the base and comprises a coil assembly and a movable iron core matched with the coil assembly, and the two static conducting strips are arranged on the base in parallel; the method is characterized in that: the relay further comprises a structure for connecting the pushing component and the movable conducting strip of the relay according to any one of claims 1 to 9, wherein the movable iron core is connected with the pushing component, and the movable contacts arranged at two ends of the movable conducting strip are respectively matched with the corresponding fixed contacts arranged on the two fixed conducting strips.

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