EP3958283A2

EP3958283A2 - Electromagnetic relay capable of resisting short-circuit current

Info

Publication number: EP3958283A2
Application number: EP21275109.3A
Authority: EP
Inventors: Feifei Fu; Yiqing Zhu; Zhonghua Tan; Jinqiang Liu
Original assignee: Xiamen Hongfa Electroacoustic Co Ltd
Current assignee: Xiamen Hongfa Electroacoustic Co Ltd
Priority date: 2020-08-20
Filing date: 2021-08-11
Publication date: 2022-02-23
Anticipated expiration: 2041-08-11
Also published as: EP3958283A3; EP3958283C0; EP3958283B1; CN112086319A

Abstract

The present disclosure discloses electromagnetic relay capable of resisting short-circuit current, and includes a base (1), a magnetic circuit part, a static spring part (2) and a moving spring part. The static spring part (2) includes a static spring lead-out piece (21) and an elastic static spring piece. The static spring lead-out piece (21) is arranged on the base (1), and the static spring piece (22) is provided with a static contact (221). The static spring piece (22) is electrically connected to the static spring lead-out piece (21), and the static spring piece (22) generates an electric power in the direction of the moving spring part in the energized state, and the electric power can resist the electric repulsive force received by the static contact (221).

Description

TECHNICAL FIELD

The present disclosure relates to the technical field of relays, in particular to an electromagnetic relay capable of resisting short-circuit current.

BACKGROUND

Short-circuit (Short circuit) refers to the situation when two points with different potentials in a normal circuit are directly connected incorrectly or connected by a conductor with very small impedance (or resistance). The current intensity is very high during short circuit, which will often damage electrical equipment or cause fire. The current connected in this case is the short circuit current. When the relay is working normally in the circuit, when the short circuit current passes through, the electrodynamic repulsion formed by the short circuit current will affect the contact parts of the relay, and in severe cases, it may cause contact bonding or abnormal disconnection failure. The ability of a relay to resist a certain short circuit current without damage is called the ability of the relay to withstand short circuit current.
When a traditional electromagnetic relay passes a short-circuit current, the contacts are repelled under the action of electric repulsive force, resulting in open contacts or failure of contact bonding, and has a low short-circuit current resistance. For this reason, an electromagnetic relay with anti-short-circuit current function has appeared in the prior art. However, the structure of this electromagnetic relay for resisting short-circuit current is mostly set in the moving spring part, and additional transmission components (such as push cards) need to be added. This not only increases the cost and difficulty of structural assembly, but also is not suitable for electromagnetic relays with a relatively compact structure and a relatively small volume.

SUMMARY

Aiming at the technical problems existing in the prior art, the present disclosure provides an electromagnetic relay capable of resisting short-circuit current.
The technical solutions adopted by the present disclosure to solve its technical problems are: an electromagnetic relay capable of resisting short-circuit current, includes a base, a magnetic circuit part, a static spring part and a moving spring part, the static spring part includes a static spring lead-out piece and an elastic static spring piece, the static spring lead-out piece is arranged on the base, and the static spring piece is provided with a static contact, the static spring piece is connected to the static spring lead-out piece, and the static spring piece generates an electric power in a direction of the moving spring part in an energized state, and the electric power can resist an electric repulsive force received by the static contact.
Further, the electric power is greater than the electric repulsive force, and/or, in a state where the static contact is in contact with a moving contact of the moving spring part, the static spring piece generates an elastic pre-pressure oriented toward the moving spring part.
Further, one end of the static spring piece is connected with the static spring lead-out piece, and the base is provided with a limiting structure, the limiting structure restricts the other end of the static spring piece from moving toward the moving spring part and/or the static spring lead-out piece, or, the limiting structure restricts a movement stroke of the other end of the static spring piece moving toward the moving spring part and/or the static spring lead-out piece.
Further, the static spring piece is in an elastic pre-pressure state through the limiting structure before the static contact contacts the moving contact of the moving spring part.
Further, the limiting structure is a limiting slot, and the other end of the static spring piece is inserted into the limiting slot; when the static contact is in contact with the moving contact, there is a preset gap between the other end of the static spring piece and a slot wall of the limiting slot close to the moving spring part.
Further, the static spring lead-out piece and the static spring piece form a U-shape or V shape; the static spring piece and the static spring lead-out piece are riveted or welded.
Further, the magnetic circuit part includes a yoke, an armature, and a coil former equipped with an iron core and an enameled wire, the coil former is arranged on the base, and the armature is arranged at a knife edge of the yoke and matched with the moving spring part and the iron core.
Further, further includes an auxiliary moving spring piece provided with an auxiliary moving contact and an auxiliary static spring piece provided with an auxiliary static contact, the auxiliary moving spring piece and the auxiliary static spring piece are correspondingly matched, and they are respectively mounted on the coil former and/or the base, the auxiliary moving spring piece is linked with the armature, and an action state of the auxiliary moving spring piece is opposite to an action state of the moving spring part.
Further, the auxiliary moving spring piece includes a vertical first piece body and a horizontal second piece body, the first piece body is integrally connected with the second piece body, and a bottom of the first piece body passes through the base, the second piece body is Z-shaped and/or is provided with a hollow structure, and the second piece body is provided with an auxiliary moving contact and is linked with the armature; the auxiliary moving spring piece and the auxiliary static spring piece are respectively inserted into the coil former from a side of the coil former; the armature is provided with a driving part for driving the second piece body to move.
Further, the moving spring part includes a rigid moving spring piece provided with a moving contact, and the rigid moving spring piece is relatively fixed to the armature; a restoring spring piece is inserted between the yoke and the base, and the restoring spring piece limits the armature and provides the armature to reset.
Further, the rigid moving spring piece and the armature are connected together by a plastic part through insert injection molding or glue dispensing. Compared with the prior art, the present disclosure has the following beneficial effects:

1. Since the static spring part includes a static spring lead-out piece and a static spring piece with elasticity, the static spring lead-out piece is arranged on the base, and the static contact is arranged on the static spring piece. The static spring piece is electrically connected with the static spring lead-out piece, and the static spring piece generates electric power in the direction of the moving spring part in the energized state, the electric power can resist the electric repulsive force received by the static contact, so that when the present disclosure passes a short-circuit current, the static contact and the moving contact are not easily repelled, thereby improving the ability of the present disclosure to resist short-circuit current. In addition, the design of the static spring part of the present disclosure also enables reliable contact between the static and moving contacts, reduces the bounce of the contact, and improves the contact stability of the contact; There is no need to add an additional transmission structure, which reduces the number of parts, reduces the complexity of the structure, and reduces the product volume to a certain extent.
2. Since in the state that the static contact is in contact with the moving contact of the moving spring part, the static spring piece generates an elastic pre-pressure in the direction of the moving spring part, therefore, the present disclosure can also use the elastic pre-pressure to make the static contact and the moving contact firmly contact together, thereby further improving the short-circuit current resistance and the contact stability of the present disclosure.
3. Since one end of the static spring piece is connected with the static spring lead-out piece, the base is provided with a limiting structure. The limiting structure restricts the other end of the static spring piece from moving toward the moving spring part and/or the static spring lead-out piece, or, the limiting structure restricts the movement stroke of the other end of the static spring piece toward the moving spring part and/or the static spring lead-out piece. The present disclosure can limit the stroke of the static spring piece to be deformed in the direction of the moving spring part under the action of electric power, and prevent the moving contact from shaking apart due to the excessive stroke, and/or, the present disclosure can avoid the occurrence of an abnormal state in which the static spring piece is pushed by the moving spring part to contact with the static spring lead-out piece. The static spring piece is in a pre-compressed state before its static contact is in contact with the moving contact, such that as soon as the moving contact is brought into contact with the static contact, the static spring piece has the pre-pressure for reliably contacting the static and moving contacts, thereby ensuring that the short-circuit resistance of the present disclosure is more reliable.
4. The limiting structure is a limiting slot, and the other end of the static spring piece is inserted into the limiting slot, so that the limiting structure of the present disclosure can bidirectionally limit the other end of the static spring piece. When the static contact is in contact with the moving contact, there is a preset gap between the other end of the static spring piece and the slot wall on the side of the limiting slot close to the moving spring part, such that the present disclosure can play the role of resisting contact adhesion.
5. The present disclosure also includes the auxiliary moving spring piece and auxiliary static spring piece, which can be used to monitor the state of the main contact unit (ie, the moving spring part and the static spring part).
6. The second piece body of the auxiliary moving spring piece is Z-shaped and/or is provided with a hollow structure, which can increase the elasticity of the second piece body.
7. Since the moving spring part includes a rigid moving spring piece with a moving contact, the rigid moving spring piece is relatively fixed to the armature, so that when a short-circuit current passes through the present disclosure, the rigid moving spring piece is not easily repelled by the electromotive force received by the moving contact, therefore, the short-circuit current resistance and contact stability of the present disclosure can be further improved.

The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments; However, the electromagnetic relay capable of resisting short-circuit current of the present disclosure is not limited to the embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the three-dimensional structure of the embodiment one of the present disclosure;
FIG. 2 is a front view of the embodiment one of the present disclosure;
FIG. 3 is a schematic diagram (partial cross-sectional view) of the cooperation between the static spring part and the base of the present disclosure in the embodiment one;
FIG. 4 is a front view (partial cross-sectional view) of the embodiment one of the present disclosure when the moving contact is in contact with the static contact;
FIG. 5 is a front view (partial cross-sectional view) of the embodiment one of the present disclosure when a short-circuit current is passed through;
FIG. 6 is a schematic diagram of the three-dimensional structure of the embodiment two of the present disclosure.

DETAILED DESCRIPTION

Embodiment One

Please refer to FIGS. 1 to 5, an electromagnetic relay capable of resisting short-circuit current of the present disclosure includes a base 1, a magnetic circuit part, a static spring part 2 and a moving spring part. The static spring part 2 includes a static spring lead-out piece 21 and an elastic static spring piece 22. The static spring lead-out piece 21 is arranged on the base 1, and the static spring piece 22 is provided with a static contact 221. The static spring piece 22 is electrically connected to the static spring lead-out piece 21, and the static spring piece 22 generates an electric power in the direction of the moving spring part in the energized state, and the electric power can resist the electric repulsive force received by the static contact 221. The electric power is greater than the electric repulsive force, and/or, when the static contact 221 is in contact with the moving contact 91 of the moving spring part, the static spring piece 22 generates an elastic pre-pressure in the direction toward the moving spring part. The "and/or" means that the present disclosure only has the situation that "the electric power is greater than the electric repulsive force", or, in the present disclosure, there is only a situation in which "when the static contact 221 is in contact with the moving contact 91 of the moving spring part, the static spring piece 22 generates an elastic pre-pressure in the direction of the moving spring part", or, the present disclosure both has "the electric power is greater than the electric repulsive force" and "when the static contact 221 is in contact with the moving contact 91 of the moving spring part, the static spring piece 22 generates an elastic pre-pressure in the direction of the moving spring part". In this embodiment, the electric power is greater than the electric repulsive force, and when the static contact 221 is in contact with the moving contact 91 of the moving spring part, the static spring piece 22 generates an elastic pre-pressure in the direction toward the moving spring part.
In this embodiment, the base 1 is provided with a limiting structure, the limiting structure restricts the other end of the static spring piece 22 from moving toward the moving spring part and/or the static spring lead-out piece 21, or, the limiting structure restricts the movement stroke of the other end of the static spring piece 22 moving toward the moving spring part and/or the static spring lead-out piece 21, and the static spring piece 22 is in an elastic pre-pressure state before its static contact 221 contacts the moving contact 91. The limiting structure is specifically a limiting slot 11, and the other end of the static spring piece 22 is inserted into the limiting slot 11. As shown in FIG. 3, the static spring piece 22 has a certain opening angle in advance (as shown by the dashed line in FIG. 3), after the other end of the static spring piece 22 is inserted into the limiting slot 11, the other end of the static spring piece 22 is limited by the limiting slot 11, and the static spring piece 22 is deformed to generate a certain elastic pre-pressure. As shown in FIG. 4, when the static contact 221 is in contact with the moving contact 91, there is a preset gap between the other end of the static spring piece 22 and the slot wall of the limiting slot 11 close to the moving spring part. In other embodiments, the limiting structure is a limiting protrusion.
In this embodiment, the static spring lead-out piece 21 and the static spring piece 22 roughly form an inverted U-shape (or a V-shape). One end of the static spring piece 22 is riveted and fixed to the static spring lead-out piece 21, but not limited thereto. In other embodiments, one end of the static spring piece is welded and fixed with the static spring lead-out piece.
In this embodiment, the magnetic circuit part includes a yoke 5, an armature 4, and a coil former 3 equipped with an iron core and enameled wire. The coil former 3 is erected on the base 1, the armature 4 is arranged at the knife edge of the yoke 5 and is matched with the moving spring part and the iron core. The static spring lead-out piece 21 is vertical, and its bottom end is inserted into the base 1, and its top end is connected to one end of the static spring piece 22 in the above-mentioned fixed manner. The other end of the static spring lead-out piece 21 faces downward. In other embodiments, the coil former is lying on the base.
In this embodiment, the number of the static spring part 2 is specifically two groups, but not limited to this, the two static spring parts 2 are arranged side by side on the same side of the base 1.
In this embodiment, the present disclosure also includes an auxiliary moving spring piece 7 provided with an auxiliary moving contact 721, and an auxiliary static spring piece 8 provided with an auxiliary static contact 821, the auxiliary moving spring piece 7 and the auxiliary static spring piece 8 are correspondingly matched, and they are respectively mounted on the coil former 3 and/or the base 1. The auxiliary moving spring piece7 is driven by the armature 4, and the operating state of the auxiliary moving spring piece 7 is opposite to that of the moving spring part. That is, when the moving spring part moves in the direction of attracting and closing, the auxiliary moving spring piece 7 moves in the direction of disconnection, when the moving spring part moves in the disconnecting direction, the auxiliary moving spring piece 7 moves in the sucking and closing direction.
In this embodiment, the auxiliary moving spring piece 7 includes a vertical first piece body 71 and a horizontal second piece body 72. The bottom of the first piece body 71 passes through the base 1, and the second piece body 72 is in a zigzag shape, the upper end of the second piece body 72 is integrally connected with the top of the first piece body 71, and the upper end of the second piece body 72 and/or the top of the first piece body 71 are limited to the coil former 3. The auxiliary moving contact 721 is provided at the lower end of the second piece body 72, and the second piece body 72 cooperates with the armature 4 to act. The auxiliary static spring piece 8 is roughly L-shaped, and includes a vertical third piece body 81 and a horizontal fourth piece body 82. The bottom of the third piece body 81 passes through the base 1, and the top of the third piece body 81 is integrally connected with one end of the fourth piece body 82, and the top of the third piece body 81 and/or one end of the fourth piece body 82 is limited to the coil former 3, and the other end of the fourth piece body 82 is provided with the auxiliary static contact 821.
In this embodiment, the auxiliary moving spring piece 7 and the auxiliary static spring piece 8 are inserted into the coil former 3 from the side of the coil former 3, respectively. Specifically, the top of the coil former 3 is provided with an L-shaped first slot 31 and an L-shaped second slot 32, the upper end of the second piece body 72 and the top of the first piece body 71 are inserted into the first slot 31 from the side of the coil former 3; The top of the third piece body 81 and one end of the fourth piece body 82 are inserted into the second slot 32 from the side of the coil former 3. The bottoms of the first piece body 71 and the third piece body 81 are also inserted into the bottom of the coil former 3 from the side of the coil former 3 respectively. The armature 4 is provided with a driving part 41 for driving the auxiliary moving spring piece 7 to move. Specifically, when the armature 4 moves in a direction that closes the moving contact 91 and the static contact 221, the driving part 41 drives the second piece body 72 to disconnect the auxiliary moving contact 721 from the auxiliary static contact 821; When the driving part 41 releases the second piece body 72, the auxiliary moving spring piece 7 relies on its own reaction force to reset. The driving part 41 and the armature 4 are integrally formed, and the driving part 41 can be sleeved with an insulating sleeve, through which the creepage distance between the auxiliary contact unit and the enameled wire of the magnetic circuit part is increased.
In this embodiment, the moving spring part includes a rigid moving spring piece 9 provided with a moving contact 91, the moving spring piece 9 is relatively fixed to the armature 4. Specifically, the moving spring piece 9 is connected by a plastic part 10 by insert injection molding or glue dispensing. The armature 4 is roughly L-shaped, and one side is set at the knife edge of the yoke 5 and matched with the pole face of the iron core, and the other side faces downward and is connected to the moving spring piece 9 through the injection molded part 10. A restoring spring piece 6 is inserted between the yoke 5 and the base 1, and the restoring spring piece 6 limits the armature 4 and provides the armature 4 to reset.
In the electromagnetic relay capable of resisting short-circuit current of the present disclosure, when the coil (ie, enameled wire) is excited, under the action of electromagnetic attraction, the armature 4 is attracted to the iron core, the rotation of the armature 4 drives the moving spring piece 9 to rotate, so that the moving contact 91 is in contact with the static contact 221, and the main contact is conducted. At the same time, the driving part 41 on the armature 4 pushes the auxiliary moving spring piece 7 to disconnect the originally closed auxiliary contact (that is, the auxiliary moving contact 721 is separated from the auxiliary static contact 821). When the moving contact 91 and the static contact 221 are just in contact, the moving contact 91 and the static contact 221 have an elastic pre-pressure, and the static spring piece 22 is pushed by the moving spring piece 9 to be further deformed and pre-compressed until the other end of the static spring piece 22 touches the side groove wall of the limiting slot 11 far away from the moving spring piece 9, as shown in FIG. 4. Under the combined action of the elastic pre-pressure of the static spring piece 22 and the electric power generated by the energization of the static spring piece 22, the moving contact 91 and the static contact 221 are in reliable contact, which reduces the bounce of the contact and improves the contact stability of the contact. When the coil is de-energized, under the action of the restoring spring piece 6, the armature 4 rotates and returns to the initial state, and the main contact is disconnected (that is, the moving contact 91 is separated from the static contact 221), at the same time, the driving part 41 on the armature 4 leaves the second piece body 72 of the auxiliary moving spring piece 7, and the auxiliary contact is closed (that is, the auxiliary moving contact 721 is in contact with the auxiliary static contact 821).
When the coil is de-energized, if the moving contact 91 and the static contact 221 are bonded, the moving contact 91 will drive the static contact 221 to move in the direction of disconnection under the action of the reaction force of the restoring spring piece 6. Make the other end of the static spring piece 22 touch a side wall of the base limiting slot 11 close to the moving spring piece 9 at a certain speed. Thereby, a certain "knocking force" is generated, which helps the originally bonded moving and static contacts to be disconnected and plays a role in resisting contact bonding. At the same time, the moving contact 91 continues to move in the direction of disconnection under the action of the reaction force of the restoring spring piece 6 to further disconnect the bonded contact.
When the present disclosure passes short-circuit current, assuming that the current direction is upward from the bottom of the static spring lead-out piece 21 (Same thing with the current going in the opposite direction), the static spring piece 22 receives the electric power F1 to the right (the direction that makes the static contact 221 and the moving contact 91 fit tighter), due to the current contraction at the contact point on the contacts, an electrodynamic repulsion force F2 is generated on the static contact 221, and an electrodynamic repulsion force F3 is generated on the moving contact 91. The electrodynamic repulsion force F2 repels the electrodynamic repulsive force F3. Since the electric power F1 received by the static spring piece 22 is to the right, and the electrodynamic repulsive force F2 received by the static contact 221 is to the left, the two directions are opposite, and the electric power F1 on the static spring piece 22 partially offsets the electrodynamic repulsive force F2. The electric power F3 acting on the moving contact 91 can be offset due to the electromagnetic attraction on the armature 4. Furthermore, when the moving contact 91 and the static contact 221 are just in contact, the moving contact 91 and the static contact 221 have an elastic pre-pressure, and the static spring piece 22 is pushed by the moving spring piece 9 to be further deformed and pre-compressed until the other end of the static spring piece 22 touches the side groove wall of the limiting slot 11 far away from the moving spring piece 9, as shown in FIG. 4. Therefore, when the present disclosure passes short-circuit current, under the action of the electric power and elastic pre-pressure of the static spring piece 22 that are not offset by the electrodynamic repulsion force, the moving contact 91 and the static contact 221 will not be repelled, but can also be firmly contacted together. In addition, because the present disclosure uses rigid moving spring piece, when the present disclosure passes short-circuit current, the rigid moving spring piece will not be deformed under the action of electrodynamic repulsion force, thereby further improving the ability of the present disclosure to withstand short-circuit currents. The disclosure also adopts elastic static spring piece to provide pre-pressure for the contact state of the moving and static contacts to ensure the contact stability of the contacts.
An electromagnetic relay capable of resisting short-circuit current according to the present disclosure has an anti-short-circuit structure arranged in the static spring part 2, and the static spring part 2 is divided into a static spring lead-out piece 21 and a static spring piece 22, and no need to add additional transmission parts (such as push card), simple structure, convenient assembly, low cost, especially suitable for electromagnetic relays with compact structure and small volume. The special structure design of the static spring part 2 of the present disclosure, on the one hand, greatly improves the short-circuit current resistance of the present disclosure, and on the other hand, it can improve the anti-adhesion performance of the relay in the process of breaking the load.
The special structure design of the static spring part 2 of the present disclosure overcomes the technical prejudice: the static spring piece of the electromagnetic relay in the prior art is in a fixed form and has no deformability. Based on the characteristics of the static spring piece and the static contact on it, those skilled in the art generally believe that the static spring piece is in a static state and is not easily deformed. After being fixed, it cannot provide additional force for the static contact to make the moving and static contacts contact more reliable. The existing anti-short-circuit current structure is generally applied to the moving spring part, except for a part of the electric power generated thereof to overcome the electric repulsive force on the contacts, since the static spring part of the prior art is fixed, the rest all act on the moving spring piece to make the moving and static contacts come into close contact. However, this structure also needs to add a drive mechanism such as a push card to push the moving spring piece to realize the connection and disconnection of the moving and static contacts, which increases the complexity of the structure and increases the parts. At the same time, the demand for product space is also relatively large. The present disclosure designs the anti-short circuit structure in the static spring part, through the traditional magnetic circuit structure to realize the connection and disconnection of the moving and static contacts, no additional transmission structure is required, parts are reduced, the structure complexity is reduced, and the product volume is reduced to a certain extent. In the present disclosure, a limiting slot is provided on the base, so that the static spring piece has a certain pre-pressure, and the limiting slot plays a limiting role at the same time. When the static spring piece moves under the action of electric power, the limiting slot restricts the static spring piece to continue to move to ensure that the moving contact will not shake open under the action of electric power (This is because the moving spring part is not completely fixed, but is maintained at a certain position by the armature holding force. When the electric power on the static spring piece is large enough, it may cause the armature to fail to hold and the moving contact to shake off). At the same time, the anti-adhesive ability of the product is improved.
The electromagnetic relay capable of resisting short-circuit current of the present disclosure is the same as the prior art for the parts not involved or can be realized by the prior art.

Embodiment Two

Please refer to FIG. 6, an electromagnetic relay capable of resisting short-circuit current of the present disclosure, which is different from the above-mentioned embodiment one in: the coil former 3 and/or the base 1 of the present disclosure do not have the auxiliary moving spring piece and the auxiliary static spring piece, and the armature 4 is also not provided with the driving part.
In this embodiment, the rest of the structure of the present disclosure is the same as the above-mentioned embodiment 1, and will not be repeated here.
The above-mentioned embodiments are only used to further illustrate an electromagnetic relay capable of resisting short-circuit current of the present disclosure. However, the present disclosure is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present disclosure fall within the protection scope of the technical solution of the present disclosure.

Claims

An electromagnetic relay capable of resisting short-circuit current, comprising a base (1), a magnetic circuit part, a static spring part (2) and a moving spring part, wherein the static spring part (2) comprising a static spring lead-out piece (21) and an elastic static spring piece (22), the static spring lead-out piece (21) being arranged on the base (1), and the static spring piece (22) being provided with a static contact (221), the static spring piece (22) being connected to the static spring lead-out piece (21), and the static spring piece (22) generates an electric power in a direction of the moving spring part in an energized state, and the electric power can resist an electric repulsive force received by the static contact (221).
The electromagnetic relay capable of resisting short-circuit current according to claim 1, wherein the electric power is greater than the electric repulsive force, and/or, in a state where the static contact (221) is in contact with a moving contact (91) of the moving spring part, the static spring piece (22) generates an elastic pre-pressure oriented toward the moving spring part.
The electromagnetic relay capable of resisting short-circuit current according to claim 1 or 2, wherein one end of the static spring piece (22) is connected with the static spring lead-out piece (21), and the base (1) is provided with a limiting structure, the limiting structure restricts an other end of the static spring piece (22) from moving toward the moving spring part and/or the static spring lead-out piece (21), or, the limiting structure restricts a movement stroke of the other end of the static spring piece (22) moving toward the moving spring part and/or the static spring lead-out piece (21).
The electromagnetic relay capable of resisting short-circuit current according to claim 3, wherein the static spring piece (22) is in an elastic pre-pressure state through the limiting structure before the static contact contacts the moving contact (91) of the moving spring part.
The electromagnetic relay capable of resisting short-circuit current according to claim 3, wherein the limiting structure is a limiting slot (11), and the other end of the static spring piece (22) is inserted into the limiting slot (11); when the static contact (221) is in contact with the moving contact (91), there is a preset gap between the other end of the static spring piece (22) and a slot wall of the limiting slot (11) close to the moving spring part.
The electromagnetic relay capable of resisting short-circuit current according to claim 1, wherein the static spring lead-out piece (21) and the static spring piece (22) form a U-shape or V shape; the static spring piece (22) and the static spring lead-out piece (21) are riveted or welded.
The electromagnetic relay capable of resisting short-circuit current according to claim 1, wherein the magnetic circuit part includes a yoke (5), an armature (4), and a coil former (3) equipped with an iron core and an enameled wire, the coil former (3) is arranged on the base (1), and the armature (4) is arranged at a knife edge of the yoke (5) and matched with the moving spring part and the iron core.
The electromagnetic relay capable of resisting short-circuit current according to claim 7, wherein further comprises an auxiliary moving spring piece (7) provided with an auxiliary moving contact (721) and an auxiliary static spring piece (8) provided with an auxiliary static contact (821), the auxiliary moving spring piece (7) and the auxiliary static spring piece (8) are correspondingly matched, and they are respectively mounted on the coil former (3) and/or the base (1), the auxiliary moving spring piece (7) is linked with the armature (4), and an action state of the auxiliary moving spring piece (7) is opposite to an action state of the moving spring part.
The electromagnetic relay capable of resisting short-circuit current according to claim 8, wherein the auxiliary moving spring piece (7) comprises a vertical first piece body (71) and a horizontal second piece body (72), the first piece body (71) is integrally connected with the second piece body (72), and a bottom of the first piece body (71) passes through the base (1), the second piece body (72) is Z-shaped and/or is provided with a hollow structure, and the second piece body (72) is provided with an auxiliary moving contact (721) and is linked with the armature (4); the auxiliary moving spring piece (7) and the auxiliary static spring piece (8) are respectively inserted into the coil former (3) from a side of the coil former (3); the armature (4) is provided with a driving part (41) for driving the second piece body (72) to move.
The electromagnetic relay capable of resisting short-circuit current according to claim 7, wherein the moving spring part comprises a rigid moving spring piece (9) provided with a moving contact (91), and the rigid moving spring piece (9) is relatively fixed to the armature (4); a restoring spring piece (6) is inserted between the yoke (5) and the base (1), and the restoring spring piece (6) limits the armature (4) and provides the armature (4) to reset.
The electromagnetic relay capable of resisting short-circuit current according to claim 10, wherein the rigid moving spring piece (9) and the armature (4) are connected together by a plastic part (10) through insert injection molding or glue dispensing.