An electromagnetic relay capable of resisting short-circuit current

Abstract

The invention discloses an electromagnetic relay for resisting short-circuit current, comprising a base, a magnetic circuit part, a static spring part and a dynamic spring part, wherein the static spring part comprises a static spring lead-out piece and a static spring piece with elasticity, the static spring lead-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 lead-out piece, and the static spring piece generates an electromotive force in a direction toward the dynamic spring part in a power-on state, and the electromotive force can resist the electromotive repulsion force received by the static contact. The design of the static spring part of the invention can not only improve the ability of the invention to resist short-circuit circuit, but also make the static and dynamic contacts contact reliably, reduce contact bounce, improve contact stability, and do not need to add an additional transmission structure, reduce parts, reduce structural complexity, and also reduce product volume to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of relays, and in particular to an electromagnetic relay capable of resisting short-circuit current. Background Art

[0002] Short circuit refers to the situation when two points with different potentials in a normal circuit are incorrectly directly connected or connected by a conductor with very small impedance (or resistance). The current intensity is very high during a short circuit, which often damages electrical equipment or causes a fire. The current connected in this case is the short-circuit current. When the relay is working normally in the circuit, when a short-circuit current passes through it, the electromotive repulsion formed by the short-circuit current will affect the contact parts of the relay, which may cause the contacts to stick or abnormally disconnect and fail in severe cases. The ability of a relay to resist a certain short-circuit current without being damaged is called the relay's short-circuit current resistance.

[0003] When a short-circuit current passes through a conventional electromagnetic relay, the contacts are repelled by the electric repulsion force, causing the contacts to open or the contacts to fail to bond, and the short-circuit current resistance is low. For this reason, the prior art has an electromagnetic relay with a short-circuit current resistance function. However, the structure of this electromagnetic relay for short-circuit current resistance is mostly set in the dynamic spring part, and additional transmission components (such as push cards) need to be added, which not only increases the cost and difficulty of structural assembly, but is also not suitable for electromagnetic relays with a relatively compact structure and a relatively small volume. Summary of the invention

[0004] The present invention aims at solving the technical problems in the prior art and provides an electromagnetic relay capable of resisting short-circuit current.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an electromagnetic relay resistant to short-circuit current, including 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, a static contact is arranged on the static spring piece, the static spring piece is connected to the static spring lead-out piece, and the static spring piece generates an electric force directed toward the moving spring part in the power-on state, and the electric force can resist the electric repulsion exerted on the static contact.

[0006] Further, the electromotive force is greater than the electromotive repulsive force, and / or, when the static contact is in contact with the moving contact of the dynamic spring part, the static spring sheet generates an elastic pre-pressure directed toward the dynamic spring part.

[0007] Furthermore, one end of the static spring piece is connected to the static spring lead-out piece, and the base is provided with a limiting structure, which limits the movement of the other end of the static spring piece toward the dynamic spring part and / or the static spring lead-out piece, or the limiting structure limits the movement range of the other end of the static spring piece toward the dynamic spring part and / or the static spring lead-out piece.

[0008] Furthermore, the static spring piece is placed in an elastic pre-stressed state by the limiting structure before the static contact comes into contact with the moving contact of the dynamic spring part.

[0009] Furthermore, the limiting structure is a limiting groove, and the other end of the static spring piece is inserted into the limiting groove; when the static contact and the moving contact are in contact, there is a preset gap between the other end of the static spring piece and the groove wall on one side of the limiting groove close to the moving spring part.

[0010] Furthermore, the static spring lead-out piece and the static spring piece form a U-shape or a V-shape; the static spring piece and the static spring lead-out piece are riveted or welded.

[0011] Furthermore, the magnetic circuit part includes a yoke, an armature and a coil frame equipped with an iron core and enameled wire. The coil frame is arranged on the base, and the armature is arranged at the edge of the yoke and cooperates with the movable spring part and the iron core.

[0012] Furthermore, it also includes an auxiliary moving spring piece with an auxiliary moving contact and an auxiliary static spring piece with an auxiliary static contact, which are matched with each other and are respectively installed on the coil frame and / or the base; the auxiliary moving spring piece is linked with the armature, and the action state of the auxiliary moving spring piece is opposite to the action state of the moving spring part.

[0013] Furthermore, the auxiliary moving spring piece includes a first vertical piece and a second horizontal piece, the first piece is integrally connected to the second piece, the bottom of the first piece passes through the base, the second piece is Z-shaped and / or has a hollow structure, the second piece is provided with the 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 frame from the side of the coil frame; the armature is provided with a driving part for driving the second piece to move.

[0014] Furthermore, the movable spring part includes a rigid movable spring piece provided with a movable contact, and the rigid movable 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 reset for the armature.

[0015] Furthermore, the rigid movable spring piece is connected to the armature through a plastic part by insert injection molding or dispensing. Compared with the prior art, the present invention has the following beneficial effects:

[0016] 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 a static contact is arranged on the static spring piece, the static spring piece is electrically connected to the static spring lead-out piece, and the static spring piece generates an electric force in the direction toward the dynamic spring part when it is energized, and the electric force can resist the electric repulsion of the static contact, so that when the short-circuit current passes through the present invention, the static contact and the dynamic contact are not easily repelled, thereby improving the short-circuit current resistance of the present invention. In addition, the design of the static spring part of the present invention also makes the static and dynamic contacts reliably contact, reduces the contact bounce, and improves the contact stability of the contact; there is no need to add an additional transmission structure, reduces the number of parts, reduces the complexity of the structure, and also reduces the product volume to a certain extent.

[0017] 2. Since the static spring sheet generates an elastic pre-pressure directed toward the dynamic spring part when the static contact is in contact with the dynamic contact of the dynamic spring part, the present invention can also utilize the elastic pre-pressure to make the static contact and the dynamic contact firmly contact together, thereby further improving the short-circuit current resistance and contact stability of the present invention.

[0018] 3. Since one end of the static spring piece is connected to the static spring lead-out piece, the base is provided with a limiting structure, which limits the movement of the other end of the static spring piece toward the dynamic spring part and / or the static spring lead-out piece, or the limiting structure limits the movement stroke of the other end of the static spring piece toward the dynamic spring part and / or the static spring lead-out piece. , so that the present invention can limit the deformation stroke of the static spring piece in the direction of the dynamic spring part under the action of the electric force, avoid the excessive stroke and shake the moving contact, and / or the present invention can avoid the abnormal state that the static spring piece is pushed by the dynamic spring part to contact with the static spring lead-out piece. The static spring piece is in a pre-stressed state before its static contact contacts the moving contact, so that once the moving contact contacts the static contact, the static spring piece has a pre-stress that makes the static and dynamic contacts contact reliably, thereby ensuring that the anti-short circuit performance of the present invention is more reliable.

[0019] 4. The limiting structure is a limiting groove, and the other end of the static spring piece is inserted into the limiting groove, so that the limiting structure of the present invention can limit the other end of the static spring piece in two directions. When the static contact and the moving contact are in contact, there is a preset gap between the other end of the static spring piece and the groove wall on one side of the limiting groove close to the moving spring part, so that the present invention can play a role in preventing contact adhesion.

[0020] 5. The present invention also includes the auxiliary moving spring piece and the auxiliary static spring piece, which can be used to monitor the status of the main contact unit (ie, the moving spring part and the static spring part).

[0021] 6. The second sheet of the auxiliary movable spring is in a Z-shape and / or is provided with a hollow structure, which can increase the elasticity of the second sheet.

[0022] 7. Since the movable spring part includes a rigid movable spring piece provided with a movable contact, the rigid movable spring piece is relatively fixed to the armature, so that when a short-circuit current passes through the present invention, the rigid movable spring piece is not easily repelled by the electric repulsion force to which the passive contact is subjected, thereby further improving the short-circuit current resistance capability and contact stability of the present invention.

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the short-circuit current-resistant electromagnetic relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the three-dimensional structure of the present invention in Example 1;

[0025] Figure 2 This is a front view of the first embodiment of the present invention;

[0026] Figure 3 1 is a schematic diagram of the cooperation between the static spring part and the base of the present invention in the first embodiment (partial cross-section);

[0027] Figure 4 It is a front view (partial cross-section) of the first embodiment of the present invention when the moving contact and the stationary contact are in contact;

[0028] Figure 5 This is a front view (partial cross-section) of the present invention in the first embodiment when a short-circuit current passes through it;

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention. DETAILED DESCRIPTION

[0030] Embodiment 1

[0031] See also Figure 1-Figure 5As shown, an electromagnetic relay for resisting short-circuit current of the present invention comprises a base 1, a magnetic circuit part, a static spring part 2 and a moving spring part, wherein the static spring part 2 comprises a static spring lead-out piece 21 and a static spring piece 22 with elasticity, wherein the static spring lead-out piece 21 is arranged on the base 1, and a static contact 221 is arranged on the static spring piece 22, wherein 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 force in a direction toward the moving spring part in a power-on state, and the electric force can resist the electric repulsion force exerted on the static contact 221. The electric force is greater than the electric repulsion 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 a direction toward the moving spring part. The "and / or" means that the present invention only has the situation that "the electric force is greater than the electric repulsion force", or the present invention only has the situation that "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 preload in the direction of the moving spring part", or the present invention simultaneously has the situation that "the electric force is greater than the electric repulsion 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 preload in the direction of the moving spring part". In this embodiment, the electric force is greater than the electric repulsion 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 preload in the direction of the moving spring part.

[0032] 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 toward the dynamic spring part and / or the static spring lead-out piece 21, or limits the movement of the other end of the static spring piece 22 toward the dynamic spring part and / or the static spring lead-out piece 21, and makes the static spring piece 22 in an elastic pre-stressed state before its static contact 221 contacts the dynamic contact 91. The limiting structure is specifically a limiting groove 11, and the other end of the static spring piece 22 is inserted into the limiting groove 11. Figure 3 As shown, the static spring 22 has a certain opening angle (such as Figure 3 As shown by the dotted line in the figure, after the other end of the static spring piece 22 is inserted into the limiting groove 11, the other end of the static spring piece 22 is limited by the limiting groove 11, and the static spring piece 22 is deformed to generate a certain elastic preload. 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 side wall of the limiting groove 11 close to the moving spring part, as shown in FIG. Figure 4 In other embodiments, the limiting structure is a limiting convex portion.

[0033] In this embodiment, the static spring lead-out piece 21 and the static spring piece 22 roughly form an inverted U shape (or V shape). One end of the static spring piece 22 is fixed to the static spring lead-out piece 21 by riveting, but it is not limited to this. In other embodiments, one end of the static spring piece is fixed to the static spring lead-out piece by welding.

[0034] In this embodiment, the magnetic circuit part includes a yoke 5, an armature 4 and a coil frame 3 equipped with an iron core and enameled wire. The coil frame 3 is placed vertically on the base 1, and the armature 4 is arranged at the edge of the yoke 5 and cooperates with the movable 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 form. The other end of the static spring lead-out piece 21 faces downward. In other embodiments, the coil frame is placed horizontally on the base.

[0035] In this embodiment, the number of the static spring parts 2 is specifically two groups, but it is not limited thereto. The two groups of static spring parts 2 are arranged side by side on the same side of the base 1 .

[0036] In this embodiment, the present invention 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, which are matched with each other and are respectively mounted on the coil frame 3 and / or the base 1. The auxiliary moving spring piece 7 is driven by the armature 4, and the action state of the auxiliary moving spring piece 7 is opposite to the action state of the moving spring part, that is, when the moving spring part moves in the direction of attraction, the auxiliary moving spring piece 7 moves in the direction of disconnection, and when the moving spring part moves in the direction of disconnection, the auxiliary moving spring piece 7 moves in the direction of attraction.

[0037] In this embodiment, the auxiliary moving spring piece 7 includes a first vertical piece 71 and a second horizontal piece 72, the bottom of the first piece 71 passes through the base 1, the second piece 72 is Z-shaped, the upper end of the second piece 72 is integrally connected with the top of the first piece 71, and the upper end of the second piece 72 and / or the top of the first piece 71 is limited to the coil frame 3, the lower end of the second piece 72 is provided with the auxiliary moving contact 721, and the second piece 72 cooperates with the armature 4. The auxiliary static spring piece 8 is roughly L-shaped, including a third vertical piece 81 and a fourth horizontal piece 82, the bottom of the third piece 81 passes through the base 1, the top of the third piece 81 is integrally connected with one end of the fourth piece 82, and the top of the third piece 81 and / or one end of the fourth piece 82 is limited to the coil frame 3, and the other end of the fourth piece 82 is provided with the auxiliary static contact 821.

[0038] In this embodiment, the auxiliary moving spring piece 7 and the auxiliary static spring piece 8 are respectively inserted into the coil frame 3 from the side of the coil frame 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. 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 of the coil frame 3; the top of the third sheet 81 and one end of the fourth sheet 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 respectively inserted into the bottom of the coil frame 3 from the side of the coil frame 3. 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 the direction of closing the moving contact 91 and the static contact 221, the driving part 41 drives the second sheet 72 to disconnect the auxiliary moving contact 721 from the auxiliary static contact 821; when the driving part 41 releases the second sheet 72, the auxiliary moving spring piece 7 is reset by its own reaction force. The driving part 41 is integrally formed with the armature 4, and the driving part 41 can be covered with an insulating sleeve, so that the creepage distance between the auxiliary contact unit and the enameled wire of the magnetic circuit part is increased.

[0039] In this embodiment, the movable spring part includes a rigid movable spring piece 9 provided with a movable contact 91, and the movable spring piece 9 is relatively fixed to the armature 4. Specifically, the movable spring piece 9 is connected together by insert injection molding or dispensing through a plastic part 10. The armature 4 is roughly L-shaped, and one side of it is arranged at the edge of the yoke 5 and cooperates with the pole surface of the iron core, and the other side faces downward and is connected to the movable spring piece 9 through the injection molding 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 with reset.

[0040] The electromagnetic relay of the present invention is resistant to short-circuit current. When its coil (i.e., enameled wire) is energized, under the action of electromagnetic attraction, the armature 4 is attracted to the iron core, and the rotation of the armature 4 drives the moving spring 9 to rotate, so that the moving contact 91 contacts the static contact 221, and the main contact is turned on. At the same time, the driving part 41 on the armature 4 pushes the auxiliary moving spring 97 to open the originally closed auxiliary contact (i.e., the auxiliary moving contact 721 is separated from the auxiliary static contact 821). When the moving contact 91 and the static contact 221 just contact, the moving contact 91 and the static contact 221 have elastic pre-pressure, and the static spring 22 is further deformed and pre-pressed by the pushing action of the moving spring 9 until the other end thereof touches the side wall of the limit groove 11 away from the moving spring 9, such as Figure 4As shown. Under the combined effect of the elastic pre-pressure of the static spring piece 22 and the electromotive force generated by the static spring piece 22 being energized, the moving contact 91 is in reliable contact with the static contact 221, reducing the bounce of the contact and improving 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 to return to the initial state, the main contact is disconnected (i.e., the moving contact 91 is separated from the static contact 221), and at the same time, the driving part 41 on the armature 4 leaves the second sheet 72 of the auxiliary moving spring piece 9, and the auxiliary contact is closed (i.e., the auxiliary moving contact 721 is in contact with the auxiliary static contact 821).

[0041] When the coil is de-energized, if the moving contact 91 and the static contact 221 are bonded, the moving contact 91 drives the static contact 221 to move in the direction of disconnection under the action of the reaction force of the restoring spring 6, so that the other end of the static spring 22 hits the wall of the base limit groove 11 close to the moving spring 9 at a certain speed, thereby generating a certain "knocking force" to help the originally bonded moving and static contacts to disconnect, and play a role in resisting contact adhesion. 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 6, further disconnecting the bonded contacts.

[0042] When the present invention passes a short-circuit current, assuming that the current direction is upward from the bottom of the static spring lead-out piece 21 (the same applies to the opposite direction of the current), the static spring piece 22 is subjected to an electric force F1 to the right (in the direction that makes the static contact 221 and the moving contact 91 fit more tightly), and the electric current shrinks at the contact point, thereby generating an electric repulsion F2 on the static contact 221 and an electric repulsion F3 on the moving contact 91, and the electric repulsion F2 and the electric repulsion F3 repel each other. Since the electric force F1 on the static spring piece 22 is to the right, and the electric repulsion F2 on the static contact 221 is to the left, the two directions are opposite, and a part of the electric force F1 on the static spring piece 22 offsets the electric repulsion F2. The electric force F3 acting on the moving contact 91 can offset the influence of the electric force F3 due to the electromagnetic attraction on the armature 4. In addition, when the moving contact 91 and the static contact 221 just come into contact, the moving contact 91 and the static contact 221 have elastic pre-pressure, and the static spring 22 is further deformed and pre-pressed by the push of the moving spring 9 until the other end thereof touches the groove wall of the limiting groove 11 away from the moving spring 9. Figure 4 As shown. Therefore, when the present invention passes a short-circuit current, under the action of the electromotive force of the static reed 22 that is not offset by the electromotive force and the elastic pre-pressure, the moving contact 91 and the static contact 221 will not only not be repelled, but can also be firmly in contact with each other. In addition, since the present invention adopts a rigid moving reed, when the present invention passes a short-circuit current, the rigid moving reed will not be deformed by the electromotive force, thereby further improving the ability of the present invention to resist short-circuit current. The present invention also adopts an elastic static reed to provide pre-pressure for the contact state of the moving and static contacts, ensuring the contact stability of the contacts.

[0043] The present invention provides an electromagnetic relay capable of resisting short-circuit current, in which the short-circuit resistance structure is arranged on the static spring part 2. The present invention provides the short-circuit resistance structure on the static spring part 2, and divides the static spring part 2 into a static spring lead-out piece 21 and a static spring piece 22. No additional transmission components (such as a push card) are required. The structure is simple, the assembly is convenient, and the cost is low. The electromagnetic relay is particularly suitable for a compact structure and a small volume. The special structural design of the static spring part 2 of the present invention greatly improves the short-circuit resistance capability of the present invention on the one hand, and can improve the anti-adhesion performance of the relay during load disconnection on the other hand.

[0044] The special structural design of the static spring part 2 of the present invention overcomes technical prejudice: the static spring piece of the electromagnetic relay of the prior art is fixed and has no deformation ability. Based on the characteristics of the static spring piece and the static contact thereon, the technicians in this field generally believe that the static spring piece is in a static state and is not easy to deform. After being fixed, it cannot provide additional force for the static contact to make the dynamic and static contacts contact more reliably. The existing anti-short-circuit current structure is generally applied to the dynamic spring part. In addition to a part of the electric force generated by it being used to overcome the electric repulsion on the contact, because the static spring part of the prior art is fixed, the rest of it all acts on the dynamic spring piece to make the dynamic and static contacts in close contact. However, this structure also needs to add a transmission mechanism such as a push card to push the dynamic spring piece to realize the connection and disconnection of the dynamic and static contacts, which increases the complexity of the structure, increases the number of parts, and also has a relatively large demand for product space. The present invention designs the anti-short-circuit structure in the static spring part, realizes the connection and disconnection of the dynamic and static contacts through the traditional magnetic circuit structure, does not need to add an additional transmission structure, reduces parts, reduces the complexity of the structure, and also reduces the product volume to a certain extent. The present invention provides a limit groove on the base so that the static spring piece has a certain pre-pressure. At the same time, the limit groove plays a limiting role. When the static spring piece moves under the action of electric force, the limit groove restricts the static spring piece from continuing to move, thereby ensuring that the moving contact will not shake open under the action of electric force (this is because the moving spring part is not completely fixed, but is maintained in a certain position by the armature holding force. When the electric force on the static spring piece is large enough, the armature may not be held, and the moving contact may shake open). At the same time, the product's anti-adhesion ability is also improved.

[0045] The electromagnetic relay for resisting short-circuit current of the present invention has the same parts as those in the prior art or can be implemented by using the prior art.

[0046] Embodiment 2

[0047] See also Figure 6 As shown, an electromagnetic relay resistant to short-circuit current of the present invention is different from the above-mentioned embodiment 1 in that the coil frame 3 and / or the base 1 of the present invention do not have the auxiliary moving spring and the auxiliary static spring, and the armature 4 is not provided with the driving part.

[0048] In this embodiment, the remaining structures of the present invention are the same as those of the above-mentioned embodiment 1 and will not be described again here.

[0049] The above embodiments are only used to further illustrate an electromagnetic relay capable of resisting short-circuit current of the present invention, but the present invention 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 invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay capable of resisting short-circuit current, comprising a base, a magnetic circuit part, a static spring part and a dynamic spring part, characterized in that: 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. A static contact is arranged on the static spring piece. The static spring piece is connected to the static spring lead-out piece, and the current directions of the static spring piece and the static spring lead-out piece are opposite. When the static spring piece is energized, it generates an electric force directed toward the moving spring part, and the electric force can resist the electric repulsion exerted on the static contact.

2. The short-circuit current-resistant electromagnetic relay according to claim 1, characterized in that: The electromotive force is greater than the electromotive repulsive force, and / or, when the static contact is in contact with the movable contact of the movable spring portion, the static spring sheet generates an elastic preload directed toward the movable spring portion.

3. The short-circuit current-resistant electromagnetic relay according to claim 1 or 2, characterized in that: One end of the static spring piece is connected to the static spring lead-out piece, and the base is provided with a limiting structure, which limits the movement of the other end of the static spring piece toward the dynamic spring part and / or the static spring lead-out piece, or the limiting structure limits the movement range of the other end of the static spring piece toward the dynamic spring part and / or the static spring lead-out piece.

4. The short-circuit current-resistant electromagnetic relay according to claim 3, characterized in that: The static spring piece is put into an elastic pre-stressed state by the limiting structure before the static contact point contacts the moving contact point of the moving spring part.

5. The electromagnetic relay against short-circuit current according to claim 3, characterized in that: The limiting structure is a limiting groove, and the other end of the static spring piece is inserted into the limiting groove; when the static contact and the moving contact are in contact, there is a preset gap between the other end of the static spring piece and a side wall of the limiting groove close to the moving spring part.

6. The electromagnetic relay against short-circuit current according to claim 1, characterized in that: The static spring lead-out piece and the static spring piece form a U-shape or a V-shape; the static spring piece and the static spring lead-out piece are riveted or welded.

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

8. The short-circuit current-resistant electromagnetic relay according to claim 7, characterized in that: It also includes an auxiliary moving spring piece with an auxiliary moving contact and an auxiliary static spring piece with an auxiliary static contact, which are matched with each other and are respectively installed on the coil frame and / or the base; the auxiliary moving spring piece is linked with the armature, and the action state of the auxiliary moving spring piece is opposite to the action state of the moving spring part.

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

10. The short-circuit current-resistant electromagnetic relay according to claim 7, characterized in that: The movable spring part comprises a rigid movable spring piece provided with a movable contact, and the rigid movable 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 with reset.

11. The electromagnetic relay capable of resisting short-circuit current according to claim 10, characterized in that: The rigid moving spring piece and the armature are connected together through a plastic part in the form of insert injection molding or glue dispensing.

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