CN212461542U - Electromagnetic relay for resisting short-circuit current - Google Patents

Abstract

The utility model discloses an anti short-circuit current's electromagnetic relay, including base, magnetic circuit part, quiet spring part and movable spring part, quiet spring part draws forth the piece and takes elastic quiet reed including quiet spring, and quiet spring draws forth the piece and sets up in the base, sets up the stationary contact on the quiet reed, and this quiet reed draws forth the piece with quiet spring and is connected, and quiet reed produces the orientation at the on-state and moves spring part electric power, and the electronic repulsion that the stationary contact received can be resisted to this electric power. The utility model discloses to the design of quiet spring part, not only can improve the utility model discloses an anti short-circuit's ability still makes quiet, movable contact reliable contact, reduces the contact spring, improves contact stability, and need not increase extra transmission structure, has reduced the part, has reduced structure complexity, has also reduced the product volume to a certain extent simultaneously.

Description

Electromagnetic relay for resisting short-circuit current

Technical Field

The utility model relates to a technical field of relay especially relates to an anti short-circuit current's electromagnetic relay.

Background

Short circuit (Shortcircuit) refers to a condition when two points of different potential are incorrectly touched directly in a normal circuit or are connected by a conductor of very small impedance (or resistance). The current intensity is very big when short-circuiting, often can damage electrical equipment or cause the conflagration. The current switched on in this case is the short-circuit current. Under the condition that the relay normally works in a circuit, when short-circuit current passes through the relay, electric repulsion force formed by the short-circuit current can affect the contact part of the relay, and contact bonding or abnormal disconnection failure can be caused in serious conditions. The ability of a relay to withstand a certain short circuit current without damage is referred to as the short circuit current resistance of the relay.

When a traditional electromagnetic relay passes through short-circuit current, the contacts are repelled under the action of electric repulsion force to cause open circuit of the contacts or failure of contact adhesion, and the short-circuit current resistance is low. Therefore, an electromagnetic relay with a short-circuit current resisting function appears in the prior art, however, the structure of the electromagnetic relay for resisting the short-circuit current is mostly arranged on the movable spring part, and an additional transmission part (such as a pushing clamp) is required to be added, so that the cost and the structural assembly difficulty are increased, and the electromagnetic relay is not suitable for the electromagnetic relay with a compact structure and a small size.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem that prior art exists, provide an anti short-circuit current's electromagnetic relay.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides an anti short-circuit current's electromagnetic relay, includes base, magnetic circuit part, quiet spring part and moves the spring part, and quiet spring part draws forth the piece and takes elastic quiet reed including quiet spring, and quiet spring draws forth the piece and sets up in the base, sets up the stationary contact on the quiet reed, and this quiet reed is drawn forth the piece with quiet spring and is connected, and quiet reed produces the electric power that the direction orientation moved the spring part at the on-state, and the electronic repulsion that the stationary contact received can be resisted to this electric power.

Further, the electromotive force is larger than the electromotive repulsive force, and/or the static spring piece generates elastic pre-pressure in the direction towards the movable spring part in the contact state of the static contact and the movable contact of the movable spring part.

Furthermore, one end of the static spring is connected with the static spring leading-out piece, the base is provided with a limiting structure, the limiting structure limits the other end of the static spring to move towards the movable spring part and/or the static spring leading-out piece, or the limiting structure limits the movement stroke of the other end of the static spring to move towards the movable spring part and/or the static spring leading-out piece.

Furthermore, the static spring piece is in an elastic pre-pressing state before the static contact is contacted with the movable contact of the movable spring part through the limiting structure.

Furthermore, the limiting structure is a limiting groove, and the other end of the static reed is inserted into the limiting groove; and in a state that the static contact is in contact with the movable contact, a preset gap is formed between the other end of the static spring and the groove wall of one side of the limiting groove close to the movable spring.

Further, the static spring leading-out piece and the static spring piece form a U shape or a V shape; and the static reed is riveted or welded with the static reed leading-out sheet.

Furthermore, the magnetic circuit part comprises a yoke iron, an armature iron and a coil frame which is provided with an iron core and an enameled wire, the coil frame is arranged on the base, and the armature iron is arranged at the knife edge of the yoke iron and matched with the movable spring part and the iron core.

The coil rack is provided with a coil rack and/or a base, and is characterized by further comprising an auxiliary movable spring piece provided with an auxiliary movable contact and an auxiliary static spring piece provided with an auxiliary static contact, wherein the auxiliary movable spring piece and the auxiliary static spring piece are correspondingly matched and are respectively arranged on the coil rack and/or the base; the auxiliary movable spring is linked with the armature, and the action state of the auxiliary movable spring is opposite to that of the movable spring part.

Furthermore, the auxiliary movable spring plate comprises a vertical first plate body and a horizontal second plate body, the first plate body and the second plate body are integrally connected, the bottom of the first plate body penetrates through the base, the second plate body is Z-shaped and/or provided with a hollow structure, and the second plate body is provided with the auxiliary movable contact and is linked with the armature; the auxiliary movable spring plate and the auxiliary static spring plate are respectively inserted into the coil rack from the side surface of the coil rack; the armature is provided with a driving part for driving the second sheet body to act.

Further, the movable spring part comprises a rigid movable spring provided with a movable contact, and the rigid movable spring is fixed relative to the armature; and a restoring reed is inserted between the yoke and the base, limits the armature and provides the armature for resetting.

Furthermore, the rigid movable spring and the armature are connected together through a plastic piece in an insert injection molding or dispensing mode. Compared with the prior art, the utility model discloses following beneficial effect has:

1. because quiet spring part draws forth the piece and takes elastic quiet reed including quiet spring, quiet spring draws forth the piece and sets up in the base, sets up the stationary contact on the quiet reed, and this quiet reed draws forth the piece electricity with quiet spring to be connected, and quiet reed produces the electric power of orientation movable spring part at the on state, and this electric power can resist the electronic repulsion that the stationary contact received, makes and works as the utility model discloses a during short-circuit current, quiet contact and movable contact are difficult to be repelled and are opened, thereby improve the utility model discloses an anti short-circuit current's ability. In addition, the utility model designs the static spring part, and also ensures the static contact and the moving contact to be reliably contacted, reduces the bounce of the contact and improves the contact stability of the contact; the additional transmission structure is not needed, the number of parts is reduced, the structural complexity is reduced, and the product volume is reduced to a certain extent.

2. Because the stationary contact with the movable contact state of movable spring part, the stationary spring piece produces the elasticity pre-pressure of direction orientation movable spring part, makes the utility model discloses can also utilize this elasticity pre-pressure to make stationary contact and movable contact firmly contact together, thereby further improve the utility model discloses an anti short-circuit current's ability and contact stability.

3. Because quiet reed one end with the quiet spring is drawn forth the piece and is connected, the base is equipped with limit structure, this limit structure restriction the quiet reed other end court the movable spring part and/or the quiet spring is drawn forth the piece and is removed, perhaps, this limit structure restriction the quiet reed other end court the movable spring part and/or the quiet spring are drawn forth the removal stroke of piece, make the utility model discloses can restrict the quiet reed and receive the electric power effect towards the stroke of the direction deformation of movable spring part, avoid this stroke too big and shake out the movable contact, and/or, the utility model discloses can avoid taking place the quiet reed and promote to draw forth the abnormal condition of piece contact with the quiet spring by the movable spring part. The stationary reed is at its stationary contact with be the pre-compaction state before the movable contact, make movable contact and stationary contact, the stationary reed has the pre-compaction that makes quiet, movable contact reliable contact promptly, thereby ensures the utility model discloses an anti short circuit performance is more reliable.

4. Limit structure is the spacing groove, this spacing groove is inserted to the quiet reed other end, makes the utility model discloses a limit structure can be right the quiet reed other end carries out two-way spacing. The stationary contact contacts with movable contact point contact state, the stationary contact spring other end with the spacing groove is close to it presets the clearance to have between one side cell wall of movable spring part, makes the utility model discloses can play the effect of anti-contact bonding.

5. The utility model discloses still include supplementary movable contact spring and supplementary stationary contact spring can be used for the state of control main contact unit (being movable spring part and stationary spring part).

6. The second sheet body of the auxiliary movable reed is Z-shaped and/or provided with a hollow structure, so that the elasticity of the second sheet body can be increased.

7. Because the movable spring part is including the rigidity movable contact spring who is equipped with the movable contact, this rigidity movable contact spring with armature relatively fixed makes the utility model discloses a during short-circuit current, the electronic repulsion that the rigid movable contact spring is difficult for receiving by the contact is repulsive, thereby can further improve the utility model discloses an anti short-circuit current's ability and contact stability.

The present invention will be described in further detail with reference to the accompanying drawings and examples; however, the present invention is not limited to the embodiment.

Drawings

Fig. 1 is a schematic perspective view of the first embodiment of the present invention;

FIG. 2 is a front view of the first embodiment of the present invention;

fig. 3 is a schematic view (partially cut away) showing the fitting of the static spring part and the base according to the first embodiment of the present invention;

fig. 4 is a front view (partially cut away) showing a state where the movable contact and the fixed contact are in contact according to the first embodiment of the present invention;

FIG. 5 is a front view (partially in section) of the embodiment of the present invention when passing a short-circuit current;

fig. 6 is a schematic perspective view of the second embodiment of the present invention.

Detailed Description

Example one

Please refer to fig. 1-5, the utility model discloses an anti short-circuit current's electromagnetic relay, including base 1, magnetic circuit part, quiet spring part 2 and movable spring part, quiet spring part 2 includes that quiet spring draws forth piece 21 and takes elastic quiet reed 22, and quiet spring draws forth piece 21 and sets up in base 1, sets up stationary contact 221 on the quiet reed 22, and this quiet reed 22 draws forth piece 21 electricity with quiet spring and is connected, and quiet reed 22 produces the electric power of direction orientation movable spring part at the on-state, and the electrodynamic repulsion that this electric power can resist stationary contact 221 and receive. The electromotive force is greater than the electromotive repulsive force, and/or the stationary spring piece 22 generates an elastic preload directed toward the movable spring portion in a state where the stationary contact 221 is in contact with the movable contact 91 of the movable spring portion. "and/or" mean the utility model discloses only exist "the electrodynamic force is greater than the condition of electronic repulsion", perhaps, the utility model discloses only exist "at stationary contact 221 and the movable contact 91 contact state of movable spring part, the stationary contact spring piece 22 produces the condition of the elasticity pre-pressure of direction orientation movable spring part", perhaps, the utility model discloses coexistent "the electrodynamic force is greater than electronic repulsion" and "at stationary contact 221 and the movable contact 91 contact state of movable spring part, the stationary contact spring piece 22 produces the condition of the elasticity pre-pressure of direction orientation movable spring part". In the present embodiment, the electromotive force is larger than the electromotive repulsive force, and in the state where the stationary contact 221 is in contact with the movable contact 91 of the movable spring portion, the stationary spring piece 22 generates elastic preload directed toward the movable spring portion.

In this embodiment, the base 1 is provided with a limiting structure, which limits the movement of the other end of the static spring piece 22 towards the movable spring portion and/or the static spring leading-out piece 21, or limits the movement stroke of the other end of the static spring piece 22 towards the movable spring portion and/or the static spring leading-out piece 21, and makes the static spring piece 22 be in an elastic pre-pressing state before the static contact 221 of the static spring piece contacts the movable contact 91. The limiting structure is specifically a limiting groove 11, and the other end of the static reed 22 is inserted into the limiting groove 11. As shown in fig. 3, the static spring 22 has a certain opening angle (shown by a dotted line in fig. 3), and after the other end of the static spring 22 is inserted into the limiting groove 11, the other end of the static spring 22 is limited by the limiting groove 11, and the static spring 22 deforms to generate a certain elastic pre-pressure. In the contact state of the fixed contact 221 and the movable contact 91, a preset gap is formed between the other end of the fixed spring piece 22 and the groove wall of the limiting groove 11 on the side close to the movable spring part, as shown in fig. 4. In other embodiments, the limiting structure is a limiting convex part.

In the present embodiment, the stationary spring lead-out piece 21 and the stationary spring piece 22 are formed in a substantially inverted U-shape (or may be formed in a V-shape). One end of the static spring plate 22 is riveted and fixed with the static spring leading-out piece 21, but the invention is not limited to this, and in other embodiments, one end of the static spring plate is welded and fixed with the static spring leading-out piece.

In this embodiment, the magnetic circuit portion includes a yoke 5, an armature 4, and a coil frame 3 with an iron core and an enameled wire, the coil frame 3 is vertically disposed on the base 1, and the armature 4 is disposed at a knife edge of the yoke 5 and is matched with the movable spring portion and the iron core. The static spring leading-out piece 21 is vertical, the bottom end thereof is inserted in the base 1, and the top end thereof is connected with one end of the static spring piece 22 in the fixed form. The other end of the static spring leading-out piece 21 faces downwards. In other embodiments, the coil former is disposed horizontally to the base.

In this embodiment, the number of the static spring portions 2 is specifically two, but not limited to, two sets of the static spring portions 2 are arranged in parallel on the same side of the base 1.

In this embodiment, the present invention further comprises an auxiliary movable spring 7 disposed on the auxiliary movable contact 721, and an auxiliary stationary spring 8 disposed on the auxiliary stationary contact 821, which are correspondingly engaged with each other and are respectively mounted on the coil frame 3 and/or the base 1. The auxiliary movable reed 7 is driven by the armature 4, and the action state of the auxiliary movable reed 7 is opposite to that of the movable spring part, namely, when the movable spring part moves towards the attracting direction, the auxiliary movable reed 7 moves towards the disconnecting direction, and when the movable spring part moves towards the disconnecting direction, the auxiliary movable reed 7 moves towards the attracting direction.

In this embodiment, the auxiliary movable spring 7 includes a vertical first sheet 71 and a horizontal second sheet 72, the bottom of the first sheet 71 passes through the base 1, the second sheet 72 is in a zigzag shape, the upper end of the second sheet 72 is integrally connected to the top of the first sheet 71, the upper end of the second sheet 72 and/or the top of the first sheet 71 are limited by the coil rack 3, the lower end of the second sheet 72 is provided with the auxiliary movable contact 721, and the second sheet 72 cooperates with the armature 4. The auxiliary static reed 8 is approximately L-shaped and comprises a vertical third sheet body 81 and a horizontal fourth sheet body 82, the bottom of the third sheet body 81 penetrates through the base 1, the top of the third sheet body 81 is integrally connected with one end of the fourth sheet body 82, the top of the third sheet body 81 and/or one end of the fourth sheet body 82 are/is limited on the coil rack 3, and the other end of the fourth sheet body 82 is provided with the auxiliary static contact 821.

In this embodiment, the auxiliary movable spring 7 and the auxiliary stationary spring 8 are respectively inserted into the bobbin 3 from the side surface of the bobbin 3. Specifically, the top of the coil frame 3 is provided with an L-shaped first slot 31 and an L-shaped second slot 32, and the upper end of the second sheet 72 and the top of the first sheet 71 are inserted into the first slot 31 from the side surface of the coil frame 3; the top of the third body 81 and one end of the fourth body 82 are inserted into the second slot 32 from the side of the coil frame 3. The bottom of the first sheet 71 and the third sheet 81 are also inserted into the bottom of the bobbin 3 from the side of the bobbin 3. The armature 4 is provided with a driving part 41 for driving the auxiliary movable spring 7 to act, specifically, when the armature 4 moves in a direction of closing the movable contact 91 and the fixed contact 221, the driving part 41 drives the second sheet body 72 to disconnect the auxiliary movable contact 721 from the auxiliary fixed contact 821; when the driving part 41 releases the second blade 72, the auxiliary movable reed 7 is returned by its own reaction force. The driving part 41 is integrally formed with the armature 4, and the driving part 41 may be sleeved with an insulating sleeve through which a creepage distance between the auxiliary contact unit and the enameled wire of the magnetic circuit portion is increased.

In this embodiment, the movable spring portion includes a rigid movable spring 9 having a movable contact 91, the movable spring 9 is fixed relative to the armature 4, and specifically, the movable spring 9 is connected together by insert molding or dispensing through a plastic part 10. The armature 4 is substantially L-shaped, one side of the armature is arranged at the knife edge of the yoke 5 and is matched with the pole surface of the iron core, and the other side of the armature faces downwards and is connected with the movable spring 9 through the injection molding piece 10. A restoring spring 6 is inserted between the yoke 5 and the base 1, and the restoring spring 6 limits the armature 4 and provides the armature 4 with restoration.

The utility model discloses an anti short-circuit current's electromagnetic relay, when its coil (being the enameled wire) adds the excitation, under the effect of electromagnetic attraction, armature 4 and iron core actuation, armature 4 rotates and drives movable contact spring 9 and rotates, makes movable contact 91 and stationary contact 221 contact, and the main contact switches on, and simultaneously, the drive division 41 on the armature 4 promotes supplementary movable contact spring 97, makes the closed auxiliary contact disconnection originally (auxiliary movable contact 721 separates with supplementary stationary contact 821 promptly). When the movable contact 91 is just contacted with the fixed contact 221, the movable contact 91 and the fixed contact 221 have elastic pre-pressure, and the fixed spring piece 22 is pushed by the movable spring piece 9 to further deform and pre-press until the other end of the fixed spring piece contacts and leans against the groove wall of one side of the limiting groove 11 of the 1, which is far away from the movable spring piece 9, as shown in fig. 4. Under the combined action of the elastic pre-pressure of the fixed spring piece 22 and the electric force generated by electrifying the fixed spring piece 22, the movable contact 91 is reliably contacted with the fixed contact 221, the bounce of the contact is reduced, and the contact stability of the contact is improved. When the coil is de-energized, the armature 4 is rotated back to the initial state by the restoring reed 6, the main contact is opened (i.e., the movable contact 91 is separated from the fixed contact 221), and the driving part 41 of the armature 4 is separated from the second plate 72 of the auxiliary movable reed 9, and the auxiliary contact is closed (i.e., the auxiliary movable contact 721 is in contact with the auxiliary fixed contact 821).

When the coil is deenergized, if the movable contact 91 is bonded with the fixed contact 221, the movable contact 91 drives the fixed contact 221 to move towards the disconnection direction under the action of the counterforce of the restoring spring 6, so that the other end of the fixed spring 22 touches one side of the base limiting groove 11 close to the movable spring 9 towards the wall at a certain speed, and a certain 'knocking force' is generated, thereby helping the originally bonded movable contact and fixed contact to be disconnected and playing a role in resisting the contact bonding, and meanwhile, the movable contact 91 continues to move towards the disconnection direction under the action of the counterforce of the restoring spring 6, and further enabling the bonded contact to be disconnected.

When the utility model discloses a during short-circuit current, suppose that the electric current direction draws forth piece 21 bottom upwards (the opposite reason of electric current direction) from quiet spring, quiet spring 22 receives the electrodynamic force F1 of right (the direction that makes quiet contact 221 and movable contact 91 laminate tighter), owing to contract at the contact point current on the contact, therefore produce electronic repulsion F2 on quiet contact 221, produce electronic repulsion F3 on movable contact 91, electronic repulsion F2 repels mutually with electronic repulsion F3. Since the static reed 22 is subjected to the electric force F1 to the right and the static contact 221 is subjected to the electric repulsive force F2 to the left, the directions of the two are opposite, and the electric force F1 on the static reed 22 partially counteracts the electric repulsive force F2. The electrodynamic force F3 acting on the moving contact 91 can counteract the influence of the electrodynamic force F3 due to the action of the electromagnetic attraction force on the armature 4. In addition, when the movable contact 91 is just contacted with the fixed contact 221, the movable contact 91 and the fixed contact 221 have elastic pre-stress, and the fixed spring piece 22 is pushed by the movable spring piece 9 to be further deformed and pre-stressed until the other end of the fixed spring piece contacts and leans against the groove wall of one side of the limiting groove 11 of the 1, which is far away from the movable spring piece 9, as shown in fig. 4. Therefore, when the present invention is used for short-circuit current, under the action of the electrodynamic force and the elastic pre-pressure force, which are not offset by the electrodynamic repulsive force, of the static spring piece 22, the movable contact 91 and the static contact 221 are not only not repelled, but also can be firmly contacted together. Additionally, because the utility model discloses a rigidity movable contact spring, consequently the utility model discloses a during short-circuit current, rigidity movable contact spring can not take place deformation by the effect of electric repulsion, thereby further improves the utility model discloses anti short-circuit current's ability. The utility model discloses adopt elasticity static reed simultaneously, provide the precompression of moving, stationary contact state, ensure contact stability.

The utility model discloses an anti short-circuit current's electromagnetic relay, it will resist the short circuit structure setting at quiet spring part 2, the utility model discloses will resist the short circuit current structure setting at quiet spring part 2, fall into quiet spring with quiet spring part 2 and draw forth piece 21 and quiet reed 22, need not increase extra drive disk assembly (if promote the card), simple structure, it is convenient to assemble, and is with low costs, is particularly useful for compact structure, small electromagnetic relay. The utility model discloses a special structural design of quiet spring part 2 has improved greatly on the one hand the utility model discloses an anti short-circuit current ability, on the other hand can improve the anti-adhesion performance of the disconnected load in-process of relay.

The utility model discloses a technical bias has been overcome in quiet spring part 2's special construction design: the static reed of the electromagnetic relay in the prior art is in a fixed form and does not have deformation capacity, and based on the characteristics of the static reed and a static contact on the static reed, the static reed is generally considered to be in a static state by a person skilled in the art, is not easy to deform, and can not additionally provide force for enabling the static contact to be contacted more reliably after being fixed. The existing short-circuit current resisting structure is generally applied to a movable spring part, except for one part of generated electric force for overcoming electric repulsion force on a contact, a static spring part in the prior art is fixed, and all the rest of the generated electric force is used for enabling movable contacts and static contacts to be in close contact with each other on the movable spring. The utility model discloses with anti short circuit structural design in quiet spring part, through traditional magnetic structure realization sound contact's switch-on, disconnection, need not increase extra transmission structure, reduced the part, reduced structure complexity, also reduced the product volume to a certain extent simultaneously. The utility model discloses a set up the spacing groove on the base, make the stationary reed have certain precompression, the spacing groove plays limiting displacement simultaneously, when the stationary reed moves under the electrodynamic force effect, the spacing groove restriction stationary reed continues the motion, guarantee that the movable contact can not shake out under the electrodynamic force effect (this is because the movable spring part is not fixed completely, maintain certain position through armature holding power, when the electrodynamic force on the stationary reed is enough big, probably lead to armature to keep motionless, the movable contact shakes out), the anti adhesive capacity of product has also been improved simultaneously.

The utility model discloses an anti short-circuit current's electromagnetic relay does not relate to the part and all is the same with prior art or can adopt prior art to realize.

Example two

Referring to fig. 6, the electromagnetic relay according to the present invention is different from the first embodiment in that: the utility model discloses a coil former 3 and/or base 1 do not position supplementary movable contact spring and supplementary stationary contact spring, armature 4 also does not set up the drive division.

In this embodiment, the other structures of the present invention are the same as those of the above embodiment, and are not repeated herein.

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 by the technical entity of the present invention to the above embodiments all fall into the protection scope of the technical solution of the present invention.

Claims (11)

1. The utility model provides an anti short-circuit current's electromagnetic relay, includes base, magnetic circuit part, quiet spring part and movable spring part, its characterized in that: the static spring part comprises a static spring leading-out piece and a static spring piece with elasticity, the static spring leading-out piece is arranged on the base, a static contact is arranged on the static spring piece, the static spring piece is connected with the static spring leading-out piece, the static spring piece generates direction towards the dynamic spring part electrodynamic force in the power-on state, and the electrodynamic force can resist the electric repulsion force received by the static contact.

2. The short-circuit current resistant electromagnetic relay according to claim 1, characterized in that: the electric force is larger than the electric repulsive force, and/or the static spring piece generates elastic pre-pressure in the direction facing the movable spring part in the contact state of the static contact and the movable contact of the movable spring part.

3. The short-circuit current resistant electromagnetic relay according to claim 1 or 2, characterized in that: one end of the static reed is connected with the static reed leading-out piece, the base is provided with a limiting structure, the limiting structure limits the other end of the static reed to move towards the movable reed part and/or the static reed leading-out piece, or the limiting structure limits the movement stroke of the other end of the static reed to move towards the movable reed part and/or the static reed leading-out piece.

4. The short-circuit current resistant electromagnetic relay according to claim 3, characterized in that: the static spring piece is in an elastic pre-pressing state before the static contact is contacted with the movable contact of the movable spring part through the limiting structure.

5. The short-circuit current resistant electromagnetic relay according to claim 3, characterized in that: the limiting structure is a limiting groove, and the other end of the static reed is inserted into the limiting groove; and in a state that the static contact is in contact with the movable contact, a preset gap is formed between the other end of the static spring and the groove wall of one side of the limiting groove close to the movable spring.

6. The short-circuit current resistant electromagnetic relay according to claim 1, characterized in that: the static spring leading-out piece and the static spring leaf form a U shape or a V shape; and the static reed is riveted or welded with the static reed leading-out sheet.

7. The short-circuit current resistant electromagnetic relay according to claim 1, characterized in that: the magnetic circuit part comprises a yoke iron, an armature iron and a coil frame which is provided with an iron core and an enameled wire, the coil frame is arranged on the base, and the armature iron is arranged at the knife edge of the yoke iron and matched with the movable spring part and the iron core.

8. The short-circuit current resistant electromagnetic relay according to claim 7, characterized in that: the coil rack also comprises an auxiliary movable spring piece provided with an auxiliary movable contact and an auxiliary static spring piece provided with an auxiliary static contact, wherein the auxiliary movable spring piece and the auxiliary static spring piece are correspondingly matched and are respectively arranged on the coil rack and/or the base; the auxiliary movable spring is linked with the armature, and the action state of the auxiliary movable spring is opposite to that of the movable spring part.

9. The short-circuit current resistant electromagnetic relay according to claim 8, characterized in that: the auxiliary movable spring plate comprises a vertical first plate body and a horizontal second plate body, the first plate body and the second plate body are integrally connected, the bottom of the first plate body penetrates through the base, the second plate body is Z-shaped and/or provided with a hollow structure, and the second plate body is provided with the auxiliary movable contact and is linked with the armature; the auxiliary movable spring plate and the auxiliary static spring plate are respectively inserted into the coil rack from the side surface of the coil rack; the armature is provided with a driving part for driving the second sheet body to act.

10. The short-circuit current resistant electromagnetic relay according to claim 7, characterized in that: the movable spring part comprises a rigid movable spring provided with a movable contact, and the rigid movable spring is relatively fixed with the armature; and a restoring reed is inserted between the yoke and the base, limits the armature and provides the armature for resetting.

11. The short-circuit current resistant electromagnetic relay according to claim 10, characterized in that: the rigid movable reed and the armature are connected together through a plastic piece in an insert injection molding or dispensing mode.

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