CN112509869A

CN112509869A - Large-load electromagnetic relay

Info

Publication number: CN112509869A
Application number: CN202011279016.2A
Authority: CN
Inventors: 陈坤; 谭忠华; 刘金枪; 林正极; 洪钒钢
Original assignee: Xiamen Hongfa Electroacoustic Co Ltd
Current assignee: Xiamen Hongfa Electroacoustic Co Ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-03-16

Abstract

The invention discloses a heavy-load electromagnetic relay, which comprises a base, a magnetic circuit system, a contact system and a pushing card, wherein the magnetic circuit system comprises a coil assembly, an iron core, a yoke and an armature; the contact system comprises a static spring part provided with a static contact and a movable spring part provided with a movable contact, wherein the static spring part and the movable 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 so as to drive the movable spring part to act, and the elastic part is in a deformation state in a closed state of the movable contact and the fixed contact. The invention can assist or promote the movable spring part to realize the contact overtravel and the contact pressure by utilizing the deformation of the elastic part, thereby solving the problem that the contact overtravel and the contact pressure are difficult to realize after the movable spring part is thickened under a large load and also avoiding the problem that the movable spring part optimizes the structure or rivets a spring plate and the like to improve the deformation capability.

Description

Large-load electromagnetic relay

Technical Field

The invention relates to an electromagnetic relay, in particular to a heavy-load electromagnetic relay.

Background

An electromagnetic relay generally includes a base, a magnetic circuit system including a coil block, an iron core, a yoke, and an armature, and a contact system including a stationary spring portion and a movable spring portion. In order to be suitable for a large load, the thickness of the movable spring part is generally required to be large so as to improve the current carrying capacity of the movable spring part, but the movable spring part is thick, so that a series of problems of difficult deformation, large stress, easy occurrence of fracture and the like occur, and the movable spring part is influenced to realize contact overtravel and contact pressure. Therefore, stress is reduced by optimizing the structure of the movable spring piece (such as grooving and the like), but the method has not only unsatisfactory effect but also great difficulty (angle, size and the like need to be adjusted continuously for groping and simulation), and the product development speed is influenced. And a spring plate is additionally arranged on the movable spring part, for example, a spring plate is riveted at the tail part of the contact for increasing the deformation quantity of the whole movable spring part so as to realize the overtravel and the contact pressure of the contact. However, since the contacts of the spring leaf are required to be riveted with a plurality of spring leaves, the difficulty is increased for riveting, the riveting quality is easily influenced, and the current-carrying effect can be influenced to a certain extent.

Disclosure of Invention

The invention provides a heavy-load electromagnetic relay, which solves the problems that under heavy load, the overtravel and contact pressure of a contact are difficult to realize after a movable spring part is thickened, and also solves the problems that the movable spring part optimizes the structure or rivets a spring plate and the like to improve the deformation capacity.

The technical scheme adopted by the invention for solving the technical problems is as follows: a large-load electromagnetic relay comprises a base, a magnetic circuit system, a contact system and a pushing card, wherein the magnetic circuit system comprises a coil assembly, an iron core, a yoke and an armature, the coil assembly is arranged on the base, and the iron core, the yoke and the armature are respectively arranged at the positions, correspondingly matched, of the coil assembly; the contact system comprises a static spring part provided with a static contact and a movable spring part provided with a movable contact, wherein the static spring part and the movable 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 so as to drive the movable spring part to act, and the elastic part is in a deformation state in a closed state of the movable contact and the fixed contact.

Further, the elastic piece is arranged on the armature and is connected with the pushing card or in contact fit or clearance fit.

Further, the elastic piece is an elastic reed.

Furthermore, the elastic spring leaf is Y-shaped, two ends of the elastic spring leaf on the same side face downwards and are respectively connected with the armature, and the rest end of the elastic spring leaf is upwards and is connected with the push card or in contact fit or clearance fit.

Furthermore, the armature is L-shaped, one side of the armature is matched with the outer side of the yoke and connected with the elastic piece, and the other side of the armature is matched with the pole face of the iron core.

Furthermore, the pushing card is rotatably connected to the base, so that the pushing card drives the movable spring to act partially through swinging.

Furthermore, the pushing clamp is provided with two support legs, and the two support legs are respectively connected with the base through a rotating shaft and a shaft hole which are matched with each other.

Furthermore, the movable spring part comprises a plurality of movable spring pieces which are overlapped together, and one movable spring piece is provided with an arc arch; the movable contact is arranged at the top of the structure formed by overlapping the movable reeds, and the leading-out part is arranged at the bottom of the structure.

Furthermore, the magnetic circuit system is vertical and is inversely arranged on the base, and the armature is limited and reset by a pressure spring connected with the yoke iron; a retaining wall is arranged between the magnetic circuit system and the contact system on the base, and the top end of the retaining wall is higher than the top end of the armature iron, or the top end of the retaining wall is flush with the top end of the armature iron; the top of the retaining wall is provided with an abdication notch, and the pushing clamp is matched with the elastic piece through the abdication notch.

Further, the pushing card is provided with a first baffle plate which is blocked between the part of the elastic member, which is matched with the pushing card, and the movable spring part; the base is connected with a shell which contains the magnetic circuit system, the contact system, the pushing card and the elastic piece in a shell cavity of the shell; the shell is provided with a second baffle plate, and the bottom end of the second baffle plate is in contact with or in clearance fit with the top end of the retaining wall.

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

1. the armature iron is matched with the movable spring part through the elastic piece and the pushing clamp to drive the movable spring part to act, and the elastic piece is in a deformation state in a closed state of the movable contact and the static contact, so that the invention can assist or promote the movable spring part to realize contact overtravel and contact pressure by utilizing the deformation of the elastic piece, thereby solving the problem that the contact overtravel and the contact pressure are difficult to realize after the movable spring part is thickened under heavy load, and also avoiding the problem that the movable spring part optimizes the structure or rivets a spring plate and the like to improve the deformation capability.

2. The elastic piece is arranged on the armature and is connected with the push card or is in contact fit or clearance fit, so that the cooperation of the armature, the elastic piece and the push card is more reliable. The elastic piece is preferably an elastic spring leaf, so that the assembly is more convenient.

3. The elastic reed is Y-shaped, which is beneficial to improving the flexibility of the elastic reed, thereby further improving the elastic deformation capacity of the elastic reed.

4. The pushing card is rotatably connected to the base, so that the pushing card drives the movable spring to partially act through swinging, simple assembly of the pushing card is realized, and the problems that plastic scraps are easily generated in a traditional clamping mode and the like are solved.

5. The movable spring part adopts a laminated design, so that the current carrying capacity can be increased, and the space is saved; one movable spring leaf is provided with an arc arch, so that the flexibility of the movable spring part can be increased, and better suction counter force matching can be obtained.

6. The magnetic circuit system is vertical and is inversely arranged on the base; the base is provided with a retaining wall between the magnetic circuit system and the contact system, and the top end of the retaining wall is higher than the top end of the armature, or the top end of the retaining wall is flush with the top end of the armature, so that the creepage distance and the air gap between the magnetic circuit system and the contact system can be increased by using the retaining wall, and high insulating property is realized. The first baffle plate and the second baffle plate are further arranged, so that the insulating property of the invention can be further improved.

7. The invention has compact integral structure and small volume, and solves the problem that the traditional relay is difficult to realize large load and small volume.

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

Drawings

FIG. 1 is a schematic perspective view of the present invention (without the housing);

FIG. 2 is a schematic perspective view of the magnetic circuit system (including spring reed) of the present invention;

FIG. 3 is a schematic view of the invention armature mated to a spring reed;

FIG. 4 is a schematic perspective view of the push card of the present invention;

FIG. 5 is a first perspective view of the movable spring portion of the present invention;

FIG. 6 is a schematic perspective view of the movable spring of the present invention;

FIG. 7 is a schematic perspective view of the base of the present invention;

fig. 8 is a cross-sectional view of the present invention.

Detailed Description

In an embodiment, please refer to fig. 1 to 8, the heavy-load electromagnetic relay of the present invention includes a base 1, a magnetic circuit system, a contact system and a push card 8, wherein the magnetic circuit system includes a coil assembly 2, an iron core 5, a yoke 3 and an armature 4, the coil assembly 2 is installed on the base 1, and the iron core 5, the yoke 3 and the armature 4 are respectively disposed at positions corresponding to the coil assembly 2. Specifically, the coil assembly 2 comprises a coil frame 21 and an enameled wire 22 wound on the coil frame 21, the iron core 5 is inserted into the coil frame 21, the yoke 3 is in an L shape, one side of the yoke is riveted with one end of the iron core 5, and the other side of the yoke is matched with the side surface of the coil assembly 2; the armature 4 is L-shaped, and one side 41 thereof is fitted to the outside of the other side of the yoke 3, and the other side 42 thereof is fitted to the pole face of the other end of the iron core 5. The contact system comprises a static spring part 7 provided with a static contact 71 and a movable spring part 6 provided with a movable contact 61, wherein the static spring part 7 and the movable spring part 6 are respectively arranged on the base 1. The invention also comprises an elastic piece, the armature iron 4 is matched with the movable spring part 6 through the elastic piece and the pushing clamp 8 to drive the movable spring part 6 to move, and in the closed state of the movable contact 61 and the fixed contact 71, the elastic piece is in a deformation state to assist or promote the movable spring part to realize contact overtravel and contact pressure.

In the present embodiment, the elastic member is disposed on the armature 4 and is in contact fit with the push card 8, but not limited thereto, and in other embodiments, the elastic member is connected with the push card or in clearance fit (i.e. the elastic member has a clearance with the push card before the push card is urged to move); 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. The elastic member is specifically an elastic spring 9, as shown in fig. 3, the elastic spring 9 is Y-shaped, two ends of the same side face and are respectively connected with one side 41 of the armature, and the remaining end faces upwards and is in contact fit with the push card 8. Specifically, the elastic spring 9 is riveted to one side 41 of the armature, but the connection mode is not limited to this, and in other embodiments, the elastic spring 9 is welded to the armature 4. The elastic reed 9 is Y-shaped, which not only helps to improve the flexibility of the elastic reed 9, but also can provide abdication for the following compression spring 10.

In this embodiment, the pushing card 8 is rotatably connected to the base 1, so that the pushing card 8 drives the movable spring portion 6 to move through swinging. As shown in fig. 4, the pushing card 8 has two legs 81, and the two legs 81 are connected to the base 1 through the rotating shaft 82 and the shaft hole 11, respectively. The rotating shaft 82 is specifically disposed at the bottom of the supporting leg 81 of the push card 8, and the shaft hole 11 is specifically disposed on the base 1, as shown in fig. 7, but not limited thereto, in other embodiments, the rotating shaft is disposed on the base, and the shaft hole is disposed on the supporting leg of the push card. The pushing clamp 8 is connected with the base 1 through the rotating shaft 82 and the shaft hole 11 which are matched with each other, so that simple assembly of the pushing clamp 8 is realized, and the problems that the pushing clamp is installed on the base easily to generate plastic scraps in a traditional clamping mode and the like are solved.

In this embodiment, the movable spring part 6 includes a plurality of movable spring pieces stacked together, and one movable spring piece 63 is provided with an arc-shaped arch 631. As shown in fig. 5 and 6, the number of the movable spring pieces is two, the movable spring piece 62 close to the fixed spring portion 7 is a flat piece, the movable spring piece 63 opposite to the fixed spring portion 7 is an elongated piece, and the arc-shaped arch 631 is provided. The movable contact 61 is disposed on the top of the structure formed by the two

movable springs

62 and 63, and the bottom is disposed with a lead-out portion, specifically, a lead-out piece 64 with a lead-out pin 641.

In this embodiment, the magnetic circuit system is vertical and is upside down on the base 1, i.e. the pole face of the iron core 5 is below, and the other side 42 of the armature is below the pole face of the iron core 5, as shown in fig. 8. A compression spring 10 is connected to the yoke 3, and the compression spring 10 partially penetrates through a through groove 43 arranged on one side 41 of the armature (as shown in fig. 3, the through groove 43 is positioned between two ends of the elastic spring 9 on the same side), and is clamped at the bottom of the armature 4, as shown in fig. 8. The armature 4 is limited by the compression spring 10 and a return of the armature 4 is provided. As shown in fig. 7, the base 1 is provided with a retaining wall 12 between the magnetic circuit system and the contact system, and the top end of the retaining wall 12 is higher than the top end of the armature 4. In other embodiments, the retaining wall apex is flush with the armature apex. The top of the retaining wall 12 is provided with an abdicating notch 121, and the pushing card 8 is matched with the elastic spring leaf 9 through the abdicating notch 121.

In this embodiment, the push card 8 has a first stopper 83, and the first stopper 83 is stopped between a portion where the elastic member engages with the push card 8 (i.e., an upward end of the elastic spring 9) and the movable spring portion 6. The two support legs 81 of the push card 8 are disposed at the bottom of the first blocking plate 83, an extending portion 84 is disposed on one side of the first blocking plate 83 facing the elastic spring 9, and the extending portion 84 penetrates through the abdicating notch 121 and is in contact fit with an upward end of the elastic spring 9. The push card 8 is connected with the movable spring part 6 or is in contact fit or clearance fit. Specifically, the first baffle 83 of the push clip 8 is provided with a plurality of protrusions 85 on one side facing the movable spring portion 6, and each protrusion 85 is in contact fit with the top of the movable spring portion 6. The number of the convex portions 85 is specifically two, but not limited to this, the two convex portions 85 are distributed side by side, and the two convex portions 85 are respectively in one-to-one contact fit with the top side of the movable spring piece 62 of the movable spring part 6 close to the stationary spring part 7.

In this embodiment, as shown in fig. 8, a housing 20 is attached to the base 1, and the housing 20 accommodates the magnetic circuit system, the contact system, the push card 8, and the spring reed 9 in its housing cavity. The housing 20 is provided with a second baffle 201, and the bottom end of the second baffle 201 is in contact with or in clearance fit with the top end of the retaining wall 12.

The invention relates to a heavy-load electromagnetic relay which is normally open, but is not limited to the normally open type. When the coil component 2 is excited, under the action of electromagnetic attraction, the other side 42 of the armature is attracted with the pole face of the iron core 5, meanwhile, one side 41 of the armature swings towards one side far away from the yoke 3 together with the elastic spring leaf 9, and the elastic spring leaf 9 causes the pushing clamp 8 to swing towards one side where the movable spring part 6 is located to push the movable spring part 6 to move until the movable contact 61 and the fixed contact 71 are closed. After the movable contact 61 contacts the fixed contact 71, the elastic spring 9 is elastically deformed as the armature 41 continues to swing toward the side away from the yoke 3 (before the movable contact 61 contacts the fixed contact 71, the elastic spring 9 may not be deformed or may be deformed a little at first in the process of the armature 41 swinging toward the side away from the yoke 3), thereby assisting or urging the movable spring part 6 to realize the contact overtravel and the contact pressure. The elastic deformation capability of the elastic reed 9 determines the contribution degree of the elastic reed to the movable spring part 6 to realize the contact overtravel and the contact pressure, when the elastic deformation capability of the elastic reed 9 is better, the elastic deformation required by the movable spring part 6 to realize the contact overtravel and the contact pressure can be completely provided by the self-elastic reed 9, and when the elastic deformation capability of the elastic reed 9 is general, part of the elastic deformation required by the movable spring part 6 to realize the contact overtravel and the contact pressure is provided by the elastic reed 9. Therefore, the requirement on the deformation capacity of the movable spring part 6 is low, the problem that the contact overtravel and the contact pressure are difficult to realize due to the fact that the deformation capacity is reduced after the movable spring part 6 is thickened under a large load is solved, and the problem that the movable spring part 6 optimizes the structure or rivets a spring plate and the like to improve the deformation capacity is also solved.

When the coil assembly 2 is de-energized, under the action of the compression spring 10, the other side 42 of the armature moves away from the pole face of the iron core 5, and simultaneously, one side 41 of the armature and the elastic spring 9 swing towards the side close to the yoke 3, the elastic spring 9 restores to push the clamp 8 and the movable spring part 6 to reset, and the movable contact 61 is disconnected from the fixed contact 71.

According to the heavy-load electromagnetic relay, the magnetic circuit part is wrapped by the retaining wall 12 of the base 1, the first baffle 83 is arranged on the push clamp 8, and the second baffle 201 is arranged on the shell 20, so that a magnetic circuit system and a contact system are effectively isolated, high insulation performance is achieved, namely, the creepage distance and the air gap are increased, the safety distance is more than 5.5mm, and the requirement of insulation reinforcement can be met.

The large-load electromagnetic relay is compact in overall structure and small in size, the size of the large-load electromagnetic relay is only 30% -40% of that of a mainstream product with the same load level in the prior art, the load capacity of the large-load electromagnetic relay reaches more than 30A, and the problem that a large load and a small size are difficult to achieve in a traditional relay is solved.

The above embodiments are only used to further illustrate the large load 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. A large-load electromagnetic relay comprises a base, a magnetic circuit system, a contact system and a pushing card, wherein the magnetic circuit system comprises a coil assembly, an iron core, a yoke and an armature, the coil assembly is arranged on the base, and the iron core, the yoke and the armature are respectively arranged at the positions, correspondingly matched, of the coil assembly; the contact system comprises a static spring part provided with a static contact and a movable spring part provided with a movable contact, wherein the static spring part and the movable spring part are respectively arranged on the base; the method is characterized in that: the armature iron is matched with the movable spring part through the elastic part and the pushing clamp so as to drive the movable spring part to act, and the elastic part is in a deformation state in a closed state of the movable contact and the fixed contact.

2. A heavy load electromagnetic relay according to claim 1, characterized in that: the elastic piece is arranged on the armature and is connected with the push card or in contact fit or clearance fit.

3. A heavy load electromagnetic relay according to claim 2, characterized in that: the elastic piece is an elastic reed.

4. The heavy load electromagnetic relay of claim 3, characterized in that: the elastic spring leaf is Y-shaped, two ends of the elastic spring leaf on the same side face downwards and are respectively connected with the armature, and the rest end of the elastic spring leaf is upwards and is connected with the pushing card or in contact fit or clearance fit.

5. A heavy load electromagnetic relay according to claim 2 or 3 or 4, characterized in that: the armature is L-shaped, one side of the armature is matched with the outer side of the yoke and connected with the elastic piece, and the other side of the armature is matched with the pole face of the iron core.

6. A heavy load electromagnetic relay according to claim 1, characterized in that: the pushing card is rotatably connected to the base, so that the pushing card drives the movable spring to act partially through swinging.

7. The heavy load electromagnetic relay of claim 6, wherein: the pushing clamp is provided with two support legs, and the two support legs are respectively connected with the base through a rotating shaft and a shaft hole which are matched with each other.

8. A heavy load electromagnetic relay according to claim 1, characterized in that: the movable spring part comprises a plurality of movable spring pieces which are overlapped together, and one movable spring piece is provided with an arc arch; the movable contact is arranged at the top of the structure formed by overlapping the movable reeds, and the leading-out part is arranged at the bottom of the structure.

9. A heavy load electromagnetic relay according to claim 1, characterized in that: the magnetic circuit system is vertical and is inversely arranged on the base, and the armature is limited and reset by a pressure spring connected with the yoke iron; a retaining wall is arranged between the magnetic circuit system and the contact system on the base, and the top end of the retaining wall is higher than the top end of the armature iron, or the top end of the retaining wall is flush with the top end of the armature iron; the top of the retaining wall is provided with an abdication notch, and the pushing clamp is matched with the elastic piece through the abdication notch.

10. The heavy load electromagnetic relay of claim 9, wherein: the pushing clamp is provided with a first baffle which is blocked between the part of the elastic piece matched with the pushing clamp and the movable spring part; the base is connected with a shell which contains the magnetic circuit system, the contact system, the pushing card and the elastic piece in a shell cavity of the shell; the shell is provided with a second baffle plate, and the bottom end of the second baffle plate is in contact with or in clearance fit with the top end of the retaining wall.