CN112735915A

CN112735915A - Electromagnetic relay

Info

Publication number: CN112735915A
Application number: CN202011530856.1A
Authority: CN
Inventors: 陈永兵; 刘金枪; 谭忠华
Original assignee: Xiamen Hongfa Electroacoustic Co Ltd
Current assignee: Xiamen Hongfa Electroacoustic Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-04-30

Abstract

The invention discloses an electromagnetic relay, which comprises a base, a magnetic circuit part, a contact part and a pushing clamp, wherein an armature iron of the magnetic circuit part is arranged on the base in a swinging way, the contact part comprises a movable spring part with a movable contact and a static spring part with a static contact, and the movable spring part and the static spring part are respectively arranged on the base; the armature iron is matched with the movable spring part through the elastic part and the pushing clamp, when the armature iron moves along the attraction direction, the movable spring part is driven to act through the elastic part and the pushing clamp, and the elastic part elastically deforms at the overtravel stage of the armature iron. According to the invention, the elastic deformation of the elastic part can be used for assisting to realize the overtravel of the contact and the pressure of the contact, so that on one hand, the static spring part can be made into rigid, and is not required to be made into flexible for realizing the overtravel of the contact, and the drop impact resistance of the relay is improved; on the other hand, the problem that the armature cannot be attracted in place after the current carrying capacity of the product is improved is solved.

Description

Electromagnetic relay

Technical Field

The invention relates to the field of relays, in particular to an electromagnetic relay.

Background

A relay is an electronic control device, which has a control system (also called input loop) and a controlled system (also called output loop), and is usually applied in an automatic control circuit, and it is actually an "automatic switch" that uses a small current to control a large current, so that it plays the roles of automatic regulation, safety protection, switching circuit, etc. in the circuit.

An electromagnetic relay is one of relays, and an electromagnetic relay in the prior art is composed of a base, a magnetic circuit part, a contact part, a push card, a shell and the like. The armature of the magnetic circuit part is swingably mounted on the base, the movable spring and the stationary spring of the contact part are respectively inserted on the base, and the head of the movable spring is connected to the upper side of the armature by a push card. The magnetic circuit part is provided with a magnetic circuit part, a coil is arranged on the magnetic circuit part, the coil is provided with a magnetic circuit part, the magnetic circuit part is. In this structure, because the position that promotes the card and impels the spring is very close with the contact point, for guaranteeing that the contact realizes the overstroke, quiet spring need be made and takes the flexibility, consequently quiet spring can be thinner, when receiving stronger vibration and impact, falls to warp behind this quiet spring meeting to lead to the contact contactless inefficacy. In addition, if the current carrying capacity of the movable spring needs to be improved under the structure, the movable spring generally needs to be thick, but the thick movable spring has the problems of difficult deformation, large stress, incapability of attracting the armature in place and the like.

Disclosure of Invention

The invention provides an electromagnetic relay aiming at the technical problems in the prior art, wherein an elastic part is added, the elastic part is utilized to assist in realizing contact overtravel, the problem that an armature cannot be attracted in place when the current carrying capacity of a product is improved is prevented, and meanwhile, the drop impact resistance of the relay is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: an electromagnetic relay includes a base, a magnetic circuit portion, a contact portion and a push card, wherein an armature of the magnetic circuit portion is swingably mounted on the base, the contact portion includes a movable spring portion having a movable contact and a stationary spring portion having a stationary contact, the movable spring portion and the stationary spring portion are mounted on the base, respectively; the armature iron is matched with the movable spring part through the elastic part and the pushing clamp, when the armature iron moves along the attraction direction, the movable spring part is driven to act through the elastic part and the pushing clamp, and the elastic part elastically deforms at the overtravel stage of the armature iron.

Furthermore, the elastic piece is arranged on the armature and is connected with the pushing card or in contact fit or clearance fit, and when the armature moves along the attraction direction, the pushing card is driven by the elastic piece to drive the movable spring part to move towards the direction of attracting the movable contact and the fixed contact.

Further, the elastic member is a restoring spring having one end fixed to a side of the armature facing the contact portion and the other end serving as a free end connected to the push card.

Furthermore, the other end of the restoring reed is provided with a pushing piece and a limiting structure, the pushing piece is inserted into a clamping groove formed in the pushing card, and the limiting structure limits the pushing card to be separated from the restoring reed.

Furthermore, the limiting structure comprises an elastic sheet which is positioned on one side of the push sheet back to the armature, the elastic sheet is inserted into the clamping groove, and the elastic sheet and the push sheet are respectively abutted against two opposite side walls of the clamping groove in the moving direction of the push card; the tail part of the elastic sheet is bent towards the direction far away from the armature to form a first hook part, and the first hook part penetrates through the clamping groove and is positioned on the pushing card.

Furthermore, the spring plate is formed by punching the middle part of the other end of the recovery spring plate and bending the spring plate along the direction far away from the armature, and the rest parts at two sides of the other end of the recovery spring plate form the push plate respectively.

Furthermore, a convex bract is arranged on one side of the push piece, back to the armature, and the convex bract is formed by punching bracts through a die.

Furthermore, the free end of the movable spring part is provided with a second hook part formed by bending along one side of the free end in the thickness direction and a third hook part formed by bending along the other side of the free end in the thickness direction, a through hole is formed in one end, far away from the magnetic circuit part, of the push card, the third hook part penetrates through the through hole and is positioned above the push card, and the third hook part is matched below the push card.

Furthermore, the movable spring part comprises the movable contact and a plurality of movable spring pieces, the movable spring pieces are overlapped together, and at least one movable spring piece is provided with an arc-shaped arch structure formed by bending one side in the thickness direction; the static spring part comprises the static contact and a rigid static reed, and the static contact is arranged on the static reed.

Furthermore, the magnetic circuit part also comprises a winding frame, an enameled wire and a U-shaped iron core, wherein the winding frame is arranged on the base, the U-shaped iron core is arranged in the winding frame, and the enameled wire is wound outside the winding frame containing the U-shaped iron core; one end of the armature iron is abutted against the pole face of one end of the U-shaped iron core, and the other end of the armature iron is used as a free end and extends upwards.

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

1. because the invention also includes the elastic component, the armature cooperates with moving spring part through the elastic component and pushing the card, when making the armature move along the actuation direction, drive the part movement of the moving spring through the elastic component and pushing the card, and in the over-travel stage of the armature, the elastic component elastic deformation, therefore the invention can utilize elastic deformation of the elastic component to assist and realize the contact over-travel and contact pressure, thus make the static spring part make rigid on the one hand, and need not make flexible in order to realize the contact over-travel, improve the anti-falling impact performance of the relay from it, prevent the static spring part from receiving the obstructed problem of contact that the deformation causes after the impact; on the other hand, the invention solves the problems that the movable spring part is thick, the deformation is difficult, the stress is large, and the armature cannot be attracted in place after the current carrying capacity is improved.

2. The elastic piece is arranged on the armature and is connected with the push card or in contact fit or clearance fit, so that the assembly mode of the elastic piece is simpler, and the structure of the original part is not required to be greatly changed. Particularly, the elastic piece is preferably a reset spring leaf, so that the assembly is more convenient, and the working state is more stable and reliable.

3. The other end of the restoring reed is provided with a push sheet and a limiting structure, the push sheet is inserted into a clamping groove formed in the push clamp, and the limiting structure limits the push clamp from being separated from the restoring reed, so that the restoring reed also has a limiting function on the push clamp, the push clamp and the restoring reed are matched more stably, and the stability of the mechanical performance of the restoring reed is improved.

4. The limiting structure preferably comprises the elastic sheet and the first hook part, so that the limiting structure is very simple and easy to realize.

5. The second hook part and the third hook part of the movable spring part are arranged, so that the movable spring part can limit the push card, and the push card and the movable spring part are stably matched, and the stability of the mechanical property of the invention is improved.

6. The movable spring part adopts a laminated design, so that the current carrying capacity can be increased, and the space is saved; at least one movable spring leaf is provided with an arch structure, so that the flexibility of the movable spring part can be increased.

The invention is further explained in detail with the accompanying drawings and the embodiments; an electromagnetic relay of the present invention is not limited to the embodiment.

Drawings

FIG. 1 is an exploded schematic view of the present invention;

FIG. 2 is a top view of the base (including the bobbin) of the present invention;

FIG. 3 is a schematic perspective view of the restoring spring according to the present invention;

figure 4 is a side view of the return spring of the present invention;

fig. 5 is a schematic perspective view of an armature of the present invention;

FIG. 6 is a top view of the push card of the present invention;

FIG. 7 is a schematic perspective view of one of the movable springs of the present invention;

FIG. 8 is a schematic perspective view of another movable spring plate of the present invention;

FIG. 9 is a schematic view showing a change in the assembled state of the push card of the present invention;

FIG. 10 is a schematic perspective view of the present invention;

fig. 11 is a cross-sectional view of the present invention.

Detailed Description

Referring to fig. 1-11, an electromagnetic relay according to the present invention includes a base 1, a magnetic circuit portion, a contact portion, a push clip 6, and a housing (not shown), wherein an armature 5 of the magnetic circuit portion is swingably mounted on the base 1, the contact portion includes a movable spring portion 7 having a movable contact 71 and a stationary spring portion 8 having a stationary contact 81, and the movable spring portion 7 and the stationary spring portion 8 are mounted on the base 1, respectively. The invention also comprises an elastic piece, the armature 5 is matched with the movable spring part 7 through the elastic piece and the pushing clamp 6, when the armature 5 moves along the attraction direction, the movable spring part 7 is driven to act through the elastic piece and the pushing clamp 6, and the elastic piece is elastically deformed at the overtravel stage of the armature 5.

In this embodiment, the magnetic circuit portion further includes a bobbin 2, an enameled wire 4 and a U-shaped iron core 3, the bobbin 2 is disposed on the base 1, the U-shaped iron core 3 is mounted in the bobbin 2, and the enameled wire 4 is wound outside the bobbin 2 containing the U-shaped iron core 3; one end of the armature 5 abuts against a pole face at one end of the U-shaped iron core 3, and a pressure spring can be further arranged to limit one end of the armature 5 so as to keep the armature in contact with the pole face at one end of the U-shaped iron core 3; the other end of the armature 5 serves as a free end and extends upward. Specifically, the bobbin 2 is integrally formed with the base 1, and the base 1 has a first slot 11 for inserting the U-shaped core 3, a second slot 12 for inserting the armature 5, a third slot 13 for inserting the static spring portion 8, and a fourth slot 14 for inserting the dynamic spring portion 7. The static spring portion 8 is located between the armature 5 and the dynamic spring portion 7.

In this embodiment, the elastic member is disposed on the armature 5 and is connected to, in contact with, or in clearance fit with the push card 6, and when the armature 5 moves in the attraction direction, the elastic member drives the push card 6, so that the push card 6 drives the movable spring portion 7 to move in the direction of attracting the movable contact 71 and the stationary contact 81. In other embodiments, the elastic member is disposed between the push clip and the movable spring portion, or the elastic member is disposed between the push clip and the armature.

In this embodiment, the elastic member is a restoring spring 9, one end of the restoring spring 9 is fixed on the side of the armature 5 facing the contact portion, and the other end of the restoring spring 9 is used as a free end to be connected with the push card 6 in a clamping manner. Specifically, one end of the restoring spring 9 and the armature 5 are fixed together in a riveting mode, at the moment, a riveting hole 91 is punched at one end of the restoring spring 9, correspondingly, a riveting bud 51 is punched on the armature 5, and the riveting bud 51 penetrates through the riveting hole 91 and then is fixed in a riveting mode. In other embodiments, the return spring end and the armature are secured together by welding. In other embodiments, the elastic member is a spring or an elastic rib or other elastic products capable of assisting in realizing the over-travel of the contact through elastic deformation.

In this embodiment, the other end of the restoring spring 9 has a pushing piece 92 and a limiting structure, the pushing piece 92 is inserted into the slot 61 provided on the pushing card 6, and the limiting structure limits the pushing card 6 to be disengaged from the restoring spring 9. The limiting structure specifically includes an elastic sheet 93, the elastic sheet 93 is located on a side of the push sheet 92 opposite to the armature 5, and the elastic sheet 93 and the push sheet 92 have a gap in the thickness direction of the return spring 9. The elastic sheet 93 is inserted into the slot 61, and the elastic sheet 93 and the pushing sheet 92 respectively abut against two opposite side walls of the slot 61 in the moving direction of the pushing card 6; the tail of the spring 93 is bent away from the armature 5 to form a first hook 931, and the first hook 931 penetrates through the slot 61 and is located on the push card 6. In other embodiments, the limiting structure includes U-shaped limiting grooves respectively disposed on end surfaces of two ends of the pushing piece in the width direction, an upper groove surface of each U-shaped limiting groove is located above the pushing card, and a lower groove surface of each U-shaped limiting groove is located below the pushing card.

In this embodiment, the spring 93 is formed by punching and bending the middle of the other end of the restoring spring 9 in a direction away from the armature 5, and the remaining parts at two sides of the other end of the restoring spring 9 form the pushing pieces 92 respectively. One side of the pushing sheet 92, back to the armature 5, is provided with a convex bract 921, the convex bract 921 is formed by punching bracts through a die, and the convex bract 921 is in a long strip shape in the up-down direction. The bract 921 can improve the strength of the push sheet 92.

In this embodiment, the free end of the movable spring part 7 has a second hook 731 bent along one side of the thickness direction thereof and a third hook 732 bent along the other side of the thickness direction thereof, one end of the push card 6 away from the magnetic circuit part is provided with a square through hole 62, the third hook 732 passes through the through hole 62 and is located above the push card 6, and the third hook 732 is fitted under the push card 6.

In this embodiment, the movable spring portion 7 includes the movable contact 71, a plurality of movable spring pieces stacked together, and a movable spring support 74, where at least one movable spring piece has an arch structure formed by bending along one side of the movable spring piece in the thickness direction; the stationary spring part 8 includes the stationary contact 81 and a rigid stationary spring 82, and the stationary contact 81 is provided on the stationary spring 82. The movable contact 71 is riveted on the top of the assembly formed by stacking the movable springs, and the movable spring bracket 74 is riveted on the bottom of the assembly formed by stacking the movable springs and inserted into the fourth slot 14 of the base. The number of the movable spring pieces is two, and one movable spring piece 72 faces the fixed spring part 8 and is provided with the arc-shaped arch structure which protrudes towards the fixed spring part 8. The other movable spring 72 is back to the static spring part 8, and the top of the other movable spring 72 is bent to form the second hook 731 and the third hook 732, the second hook 731 is bent away from the static spring part 8, and the third hook 732 is bent toward the static spring part 8.

When the push card 6 is assembled, as shown in fig. 9, the end of the push card 6 with the through hole 62 is first turned downward, and the through hole 62 is aligned with the second hook 731 of the movable spring part 7, so that the second hook 731 is hooked into the through hole 62; then, the push card 6 is rotated downwards towards the side where the magnetic circuit part is located, so that the second hook part 731 completely passes through the through hole 62 and is lapped on the top surface of the push card 6; then, the clip 10 presses the spring 93 of the restoring spring 9 to make the spring 93 and the pushing piece 92 substantially coplanar, the spring 93 and the pushing piece 92 are installed in the slot 61 of the pushing card 6, then the clip 10 is released, the spring 93 restores to be respectively clamped on two opposite side walls of the slot 61 with the pushing piece 92, and the first hook 931 at the tail end of the spring 93 leans against the top surface of the pushing card 6 to ensure that the pushing card 6 and the restoring spring 9 cannot be separated.

When a coil formed by winding an enameled wire 4 is excited, under the action of electromagnetic attraction, an armature 5 drives a restoring reed 9 to swing towards the direction of a U-shaped iron core 3, a pushing piece 92 of the restoring reed 9 pushes a card 6 to move towards one side where a magnetic circuit part is located, and accordingly a movable spring part 7 is driven to move towards a fixed spring part 8 until a movable contact 71 is contacted with a fixed contact 81. After the moving contact 71 contacts the fixed contact 81, as the armature 5 continues to swing toward the U-shaped iron core 3, the push piece 92 of the restoring spring 9 generates elastic deformation (before the moving contact 71 contacts the fixed contact 81, in the swing process of the armature 5, the push piece 92 of the restoring spring 9 may not deform, or may deform a little at first), until the other end of the armature 5 is attracted to the pole face of the other end of the U-shaped iron core 3. Therefore, the restoring spring 9 is elastically deformed at the overtravel stage of the armature 5, and can assist or urge the movable spring portion 7 to realize the contact overtravel and the contact pressure. The elastic deformation capability of the restoring reed 9 determines the contribution degree of the restoring reed to the movable spring part 7 to realize the contact overtravel and the contact pressure, when the elastic deformation capability of the restoring reed 9 is better, the elastic deformation of the movable spring part 7 required by the contact overtravel and the contact pressure can be completely provided by the restoring reed 9, and when the elastic deformation capability of the restoring reed 9 is general, a part of the elastic deformation of the movable spring part 7 required by the contact overtravel and the contact pressure is provided by the restoring reed 9. Therefore, the invention has lower requirement on the deformation capability of the movable spring part 7, solves the problem that the deformation capability is reduced after the movable spring part 7 is thickened after the current-carrying capability of a product is improved, so that the overtravel and the contact pressure of a contact are difficult to realize, and also avoids the situation that the actuation of the armature 5 is not in place. In addition, the static spring 82 of the static spring part 8 can be made rigid, and is not required to be made flexible for realizing contact overtravel, so that the falling impact resistance of the relay is improved, and the problem of contact obstruction caused by deformation of the static spring part 8 after impact is prevented.

When the coil is deenergized, the armature 5 swings in a direction away from the core 3 by the reaction force of the return spring 9 and the movable spring portion 7, the push piece 92 of the return spring 9 returns to the original position, the push piece 6 and the movable spring portion 7 return to the original position, and the movable contact 71 is disconnected from the stationary contact 81.

The parts which are not involved in the electromagnetic relay are the same as or can be realized by the prior art.

The above embodiments are only used to further illustrate the electromagnetic relay of the present invention, 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

1. An electromagnetic relay includes a base, a magnetic circuit portion, a contact portion and a push card, wherein an armature of the magnetic circuit portion is swingably mounted on the base, the contact portion includes a movable spring portion having a movable contact and a stationary spring portion having a stationary contact, the movable spring portion and the stationary spring portion are mounted on the base, respectively; the method is characterized in that: the armature iron is matched with the movable spring part through the elastic part and the pushing clamp, when the armature iron moves along the attraction direction, the movable spring part is driven to act through the elastic part and the pushing clamp, and the elastic part elastically deforms at the overtravel stage of the armature iron.

2. An electromagnetic relay according to claim 1, characterized in that: the elastic piece is arranged on the armature and is connected with the pushing card or in contact fit or clearance fit, and when the armature moves along the attraction direction, the pushing card is driven by the elastic piece to drive the movable spring part to move towards the direction of attracting the movable contact and the fixed contact.

3. An electromagnetic relay according to claim 2, characterized in that: the elastic member is a restoring spring, one end of the restoring spring is fixed on one side of the armature facing the contact part, and the other end of the restoring spring is connected with the pushing card as a free end.

4. An electromagnetic relay according to claim 3, characterized in that: the other end of the restoring reed is provided with a push sheet and a limiting structure, the push sheet is inserted into a clamping groove formed in the push card, and the limiting structure limits the push card to be separated from the restoring reed.

5. An electromagnetic relay according to claim 4, characterized in that: the limiting structure comprises an elastic sheet, the elastic sheet is positioned on one side of the push sheet back to the armature, the elastic sheet is inserted into the clamping groove, and the elastic sheet and the push sheet are respectively abutted against two opposite side walls of the clamping groove in the moving direction of the push card; the tail part of the elastic sheet is bent towards the direction far away from the armature to form a first hook part, and the first hook part penetrates through the clamping groove and is positioned on the pushing card.

6. An electromagnetic relay according to claim 5, characterized in that: the spring plate is formed by punching the middle part of the other end of the recovery spring plate and bending the spring plate along the direction far away from the armature, and the rest parts at two sides of the other end of the recovery spring plate form the push sheet respectively.

7. An electromagnetic relay according to claim 4, characterized in that: a convex bract is arranged on one side of the push piece, back to the armature, and the convex bract is formed by punching bracts through a die.

8. An electromagnetic relay according to claim 1, characterized in that: the free end of the movable spring part is provided with a second hook part formed by bending along one side of the thickness direction of the movable spring part and a third hook part formed by bending along the other side of the thickness direction of the movable spring part, one end of the push card far away from the magnetic circuit part is provided with a through hole, the third hook part penetrates through the through hole and is positioned above the push card, and the third hook part is matched below the push card.

9. An electromagnetic relay according to claim 1, characterized in that: the movable spring part comprises the movable contact and a plurality of movable spring pieces, the movable spring pieces are overlapped together, and at least one movable spring piece is provided with an arc-shaped arch structure formed by bending one side along the thickness direction of the movable spring piece; the static spring part comprises the static contact and a rigid static reed, and the static contact is arranged on the static reed.

10. An electromagnetic relay according to claim 1, characterized in that: the magnetic circuit part also comprises a winding frame, an enameled wire and a U-shaped iron core, wherein the winding frame is arranged on the base, the U-shaped iron core is arranged in the winding frame, and the enameled wire is wound outside the winding frame containing the U-shaped iron core; one end of the armature iron is abutted against the pole face of one end of the U-shaped iron core, and the other end of the armature iron is used as a free end and extends upwards.