Relay capable of improving short-circuit current impact resistance

Abstract

The utility model discloses a relay capable of improving the short-circuit current impact resistance, and the relay comprises a contact assembly which comprises a first leading-out sheet, a second leading-out sheet, a first fixed contact, a first movable contact, and a U-shaped movable contact spring; the electromagnetic system is used for generating first electromagnetic force and forming first pushing force acting on the U-shaped movable contact spring; when the first movable contact and the first static contact are closed to work, the U-shaped movable contact spring generates a second electromagnetic force enabling the second limb to expand outwards, and the acting directions of the second electromagnetic force and the pushing force on the U-shaped movable contact spring are consistent. According to the utility model, the U-shaped movable reed generates a second electromagnetic force which enables the first movable contact to tend to the first static contact in a conductive state, thereby increasing the contact pressure of the contacts, reducing the bounce of the contacts, and improving the contact stability of the contacts; the problem of relay contact bonding or abnormal disconnection failure caused by electric repulsive force formed by short-circuit current is solved through a simple structure.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, and in particular to a relay capable of improving the ability to resist short-circuit current impact. 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 low impedance. The current intensity is very high during a short circuit, which often damages electrical equipment or causes a fire. The current connected during a short circuit is the short-circuit current. When the relay is working normally in the circuit, when the short-circuit current passes through, the electromotive force 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 ability to resist short-circuit current shock.

[0003] When a short-circuit current passes through a conventional electromagnetic relay, its short-circuit current resistance is low, and the contacts may be repelled by the electric repulsion force, causing the contacts to open or the contact bonding to fail. For this reason, the prior art has developed electromagnetic relays with short-circuit current impact resistance, but such electromagnetic relays usually require additional transmission components, 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. Utility Model Content

[0004] In order to solve the problem that the electromotive force generated by a short-circuit current causes the relay contacts to stick together or fail to disconnect abnormally, the utility model provides a relay with improved short-circuit current impact resistance capability.

[0005] The technical solution adopted by the utility model is as follows: a relay with improved short-circuit current impact resistance capability, comprising: a contact assembly, comprising a first lead-out piece, a second lead-out piece, a first static contact, a first moving contact and a U-shaped moving spring piece, wherein the first static contact is fixedly connected to the first lead-out piece, the first limb of the U-shaped moving spring piece is fixedly connected to the second lead-out piece, and the second limb is fixedly connected to the first moving contact; an electromagnetic system, for generating a first electromagnetic force and forming a first driving force acting on the U-shaped moving spring piece; when the first moving contact and the first static contact are closed for operation, the U-shaped moving spring piece generates a second electromagnetic force that causes the second limb to expand outward, and the second electromagnetic force and the first driving force act in the same direction on the U-shaped moving spring piece.

[0006] Preferably, the first static contact is riveted or welded to the first lead-out piece; the first limb of the U-shaped moving spring piece is riveted or welded to the second lead-out piece, and the first moving contact is riveted or welded to the second limb of the U-shaped moving spring piece.

[0007] Preferably, the U-shaped dynamic spring sheet has a plurality of shunt copper sheets stacked in sequence and at least one elastic reinforcement sheet.

[0008] Preferably, there is a gap between the shunt copper sheet and the elastic reinforcing sheet at the U-shaped bending portion.

[0009] Preferably, the shunt copper sheet and the elastic reinforcing sheet have discontinuous separation grooves extending along the length direction.

[0010] Preferably, the elastic reinforcement sheet is provided with a raised portion at the end portion corresponding to the second limb.

[0011] Preferably, the contact assembly also includes a third lead-out piece, a fourth lead-out piece, a second static contact and a second movable contact, the third lead-out piece is a non-movable conductor, the fourth lead-out piece is a movable conductor, the second static contact is fixedly connected to the third lead-out piece, and the second movable contact is fixedly connected to the fourth lead-out piece; the first electromagnetic force generated by the electromagnetic system forms a second driving force acting on the fourth lead-out piece.

[0012] Preferably, the electromagnetic system includes an electromagnetic drive assembly, an armature assembly and a push card that are linked in sequence; the armature assembly is in the form of a lever hinged in the middle, one end of which acts on the U-shaped moving spring sheet through the push card, and the other end acts on the fourth lead-out sheet.

[0013] The utility model has the following beneficial effects: the U-shaped moving spring piece of the utility model generates a second electromagnetic force that causes the first moving contact to tend toward the first static contact in a conductive state, thereby increasing the contact pressure of the contact, reducing contact bounce, and improving the contact stability of the contact; and the problem of the relay contacts being stuck or abnormally disconnected and failing due to the electromotive force formed by the short-circuit current is solved through a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the appearance of an embodiment of the utility model.

[0015] Figure 2 It is a schematic diagram of the internal structure of an embodiment of the utility model.

[0016] Figure 3 It is a schematic diagram of the assembly of a U-shaped moving spring piece and a push card in an embodiment of the utility model.

[0017] Figure 4 It is a structural schematic diagram of a U-shaped movable spring piece in an embodiment of the utility model.

[0018] Figure 5 It is a schematic diagram of the assembly of the fourth lead-out piece and the armature assembly in the embodiment of the utility model.

[0019] First lead-out piece 1; second lead-out piece 2; first static contact 3; first moving contact 4; U-shaped moving spring piece 5, shunt copper sheet 501, elastic reinforcement sheet 502, separation groove 503, tilting portion 504; third lead-out piece 6; fourth lead-out piece 7; second static contact 8; second moving contact 9; electromagnetic drive assembly 10; armature assembly 11; push card 12; first shell 13; second shell 14; support frame 15. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the embodiments and drawings.

[0021] In the embodiment, Figures 1 to 5 As shown, a relay with improved short-circuit current impact resistance includes: a contact assembly, including a first lead-out piece 1, a second lead-out piece 2, a first static contact 3, a first moving contact 4 and a U-shaped moving spring piece 5, wherein the first static contact 3 is fixed to the first lead-out piece 1, the first limb of the U-shaped moving spring piece 5 is fixed to the second lead-out piece 2, and the second limb is fixed to the first moving contact 4; an electromagnetic system, used to generate a first electromagnetic force and form a first driving force acting on the U-shaped moving spring piece 5; when the first moving contact 4 and the first static contact 3 are closed and working, the U-shaped moving spring piece 5 generates a second electromagnetic force that causes the second limb to expand outward, and the second electromagnetic force and the first driving force act in the same direction on the U-shaped moving spring piece 5. The U-shaped moving spring piece 5 of this embodiment generates a second electromagnetic force that causes the first moving contact 4 to tend toward the first static contact 3 in a conductive state, thereby increasing the contact pressure, reducing the contact bounce, and improving the contact stability of the contact; the problem of the relay contact being stuck or abnormally disconnected and failing due to the electromotive force formed by the short-circuit current is solved through a simple structure.

[0022] In the embodiment, Figure 2 As shown, in the embodiment, the first static contact 3 is riveted or welded to the first lead-out piece 1; the first limb of the U-shaped movable spring piece 5 is riveted or welded to the second lead-out piece 2, and the first movable contact 4 is riveted or welded to the second limb of the U-shaped movable spring piece 5. Riveting or welding are both stable and reliable connection methods, which can ensure the stability and reliability of the contact assembly to meet the normal working requirements of the relay.

[0023] In the embodiment, Figure 3 , 4As shown, the U-shaped moving spring piece 5 has a plurality of shunt copper sheets 501 stacked in sequence and at least one elastic reinforcing sheet 502. The multi-layer shunt copper sheets 501 can share and evenly distribute the current, shunt the original current on the U-shaped moving spring piece 5, increase the current carrying area of ​​the part, reduce the current density, improve the conductive efficiency of the U-shaped moving spring piece 5, and reduce the heat generated by the resistor. The elastic reinforcing sheet 502 is made of materials such as spring steel, has good elasticity, and can provide a stable restoring force, so that the U-shaped moving spring piece 5 can quickly return to its original state after the current impact, which helps to reduce the residual deformation of the moving spring piece and improve the reliability of the contact, thereby ensuring the reliability of the relay.

[0024] In the embodiment, Figure 3 , 4 As shown, there is a gap between the shunt copper sheet 501 and the elastic reinforcing sheet 502 at the U-shaped bending part. The gap between each sheet at the U-shape can increase the contact area between each sheet and the air, thereby improving the heat dissipation performance, avoiding the situation of excessive local temperature, thereby ensuring the reliability of the relay, and having obvious advantages for the operation of equipment in a high temperature environment.

[0025] In the embodiment, Figure 3 , 4 As shown, the shunt copper sheet 501 and the elastic reinforcing sheet 502 have discontinuous separation grooves 503 extending along the length direction. The separation grooves 503 can reduce the stress concentration between the shunt copper sheet 201 and the elastic reinforcing sheet 502, reduce the risk of deformation and damage, and also have the effect of facilitating heat diffusion.

[0026] In the embodiment, Figure 3 , 4 As shown, the end of the elastic reinforcing sheet 502 corresponding to the second limb is provided with a tilting portion 504. The tilting portion 504 is inserted into the buckle of the push card 12 together with the end of the second limb of the U-shaped movable spring sheet 5, which can ensure the stability of the connection between the two.

[0027] In the embodiment, Figure 1 , 2 5, the contact assembly further includes a third lead piece 6, a fourth lead piece 7, a second static contact 8 and a second movable contact 9, the third lead piece 6 is a non-movable conductor, the fourth lead piece 7 is a movable conductor, the second static contact 8 is fixedly connected to the third lead piece 6, and the second movable contact 9 is fixedly connected to the fourth lead piece 7; the first electromagnetic force generated by the electromagnetic system forms a second driving force acting on the fourth lead piece 7. The above structure realizes the synchronous control of the double contact group to meet the requirements of the product double-point control.

[0028] In the embodiment, Figures 1 to 5As shown, the relay has two shells, a first shell 13 and a second shell 14, which are assembled into one by a snap-fit ​​structure, and a fixed space for the contact assembly and the electromagnetic system is formed inside. The electromagnetic system includes an electromagnetic drive assembly 10, an armature assembly 11 and a push card 12 that are linked in sequence; the electromagnetic drive assembly 10 is composed of a coil frame, a coil ( Figure 2 The armature assembly 11 is a lever with a hinged middle portion, and is composed of a bracket, a ferromagnetic block, a permanent magnet, and a magnetic isolation sheet; one end of the armature assembly 11 acts on the U-shaped movable spring piece 5 through the push card 12, and the other end acts on the fourth lead-out piece 7. Through the above structure, the first electromagnetic force generated by the electromagnetic system forms a first driving force acting on the U-shaped movable spring piece 5 and a second driving force acting on the fourth lead-out piece 7 through the armature assembly 11, thereby realizing the switching and connection operation of the double contact group relay.

[0029] Obviously, the above embodiments of the present invention are only examples for explaining the present invention, and are not intended to limit the implementation methods of the present invention. Other obvious changes or modifications derived from the essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A relay with improved short-circuit current impact resistance, characterized in that: include: A contact assembly, comprising a first lead-out piece (1), a second lead-out piece (2), a first static contact (3), a first movable contact (4) and a U-shaped movable spring piece (5), wherein the first static contact (3) is fixedly connected to the first lead-out piece (1), a first limb of the U-shaped movable spring piece (5) is fixedly connected to the second lead-out piece (2), and a second limb is fixedly connected to the first movable contact (4); An electromagnetic system, used for generating a first electromagnetic force and forming a first driving force acting on the U-shaped moving spring piece (5); When the first moving contact (4) and the first stationary contact (3) are in closed operation, the U-shaped moving reed (5) generates a second electromagnetic force causing the second limb to expand outward, and the second electromagnetic force and the first driving force act in the same direction on the U-shaped moving reed (5).

2. The relay for improving the short-circuit current impact resistance according to claim 1, characterized in that: The first static contact (3) is riveted or welded to the first lead-out piece (1); the first limb of the U-shaped moving spring piece (5) is riveted or welded to the second lead-out piece (2); and the first moving contact (4) is riveted or welded to the second limb of the U-shaped moving spring piece (5).

3. The relay for improving the short-circuit current impact resistance according to claim 1, characterized in that: The U-shaped moving spring sheet (5) comprises a plurality of shunt copper sheets (501) stacked in sequence and at least one elastic reinforcing sheet (502).

4. The relay for improving the short-circuit current impact resistance according to claim 3, characterized in that: The shunt copper sheet (501) and the elastic reinforcing sheet (502) have a gap at the U-shaped bending portion.

5. The relay for improving the short-circuit current impact resistance according to claim 3, characterized in that: The shunt copper sheet (501) and the elastic reinforcing sheet (502) are provided with discontinuous separation grooves (503) extending along the length direction.

6. The relay for improving the short-circuit current impact resistance according to claim 3, characterized in that: The elastic reinforcing sheet (502) is provided with a raised portion (504) at the end portion corresponding to the second limb.

7. The relay for improving the short-circuit current impact resistance according to claim 1, characterized in that: The contact assembly further comprises a third lead-out piece (6), a fourth lead-out piece (7), a second static contact (8) and a second movable contact (9); the third lead-out piece (6) is a non-movable conductor, the fourth lead-out piece (7) is a movable conductor, the second static contact (8) is fixedly connected to the third lead-out piece (6), and the second movable contact (9) is fixedly connected to the fourth lead-out piece (7); the first electromagnetic force generated by the electromagnetic system forms a second driving force acting on the fourth lead-out piece (7).

8. The relay for improving the short-circuit current impact resistance according to claim 7, characterized in that: The electromagnetic system comprises an electromagnetic drive assembly (10), an armature assembly (11) and a push card (12) which are linked in sequence; the armature assembly (11) is in the form of a lever with a hinged middle portion, one end of which acts on the U-shaped movable spring sheet (5) through the push card (12), and the other end of which acts on the fourth lead-out sheet (7).

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