Magnetic latching relay installed on PCB

Abstract

The utility model discloses a magnetic latching relay installed on a PCB, which comprises an electromagnetic driving assembly, an armature assembly, a pushing card and a contact assembly which are arranged in a shell, the armature assembly drives the pushing card to drive the contact assembly to open or close, and the contact assembly is provided with a first leading-out sheet and a second leading-out sheet which are led out of the shell. The ends, located outside the shell, of the first leading-out piece and the second leading-out piece are provided with split structures. According to the split structure of the first lead-out sheet and the second lead-out sheet, the contact volume of the lead-out terminal and hot tin in a tin furnace is obviously reduced during tin soldering, heat conduction is reduced, namely heat transferred to a relay through a contact assembly is reduced, and finally, a plastic part of the relay is protected from being melted; the problem of heating failure in the welding process of the magnetic latching relay and the PCB is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of magnetic latching relay, specifically relates to a magnetic latching relay installed on PCB. BACKGROUND

[0002] In prior art, large-current magnetic latching relays are usually fixed on printed circuit boards (PCB) by screw locking. This connection mode has the advantage of reliable connection, but the relays usually need to have longer connecting wires and mounting pieces, which increases the cost, and the relay body is relatively large, which is not conducive to miniaturization of the PCB. Based on this, in some applications, large magnetic latching relays are directly welded on the PCB, but these relays with pure copper dynamic / static spring pins and large pins are prone to melting of the plastic parts during the welding process due to excessive heat transfer caused by the large contact area between the pins and the series, finally leading to failure of the relay.

[0003] At present, some technologies have attempted to reduce the risk of heating by improving the pin material and optimizing the welding process, but it is still difficult to fundamentally solve this problem in actual application. CONTENT OF THE UTILITY MODEL

[0004] In order to overcome the problem of heating failure of the magnetic latching relay during the welding process, the utility model provides a magnetic latching relay installed on a PCB.

[0005] The technical scheme adopted by the utility model is as follows: a magnetic latching relay installed on a PCB, comprising an electromagnetic drive assembly, an armature assembly, a push card and a contact assembly arranged in a housing, the armature assembly drives the push card to drive the contact assembly to open or close, the contact assembly has a first lead-out piece and a second lead-out piece leading out of the housing, and the end portions of the first lead-out piece and the second lead-out piece located outside the housing have a forked structure.

[0006] Preferably, the end portions of the first lead-out piece and the second lead-out piece have at least four fork branches, and the front ends of the fork branches are provided with chamfers.

[0007] Preferably, the contact assembly further comprises a static contact, a dynamic contact and a dynamic spring piece, the first end of the dynamic spring piece is fixedly connected to the second lead-out piece, the second end is clamped with the push card, the static contact is fixedly connected to the first lead-out piece, and the dynamic contact is fixed on the dynamic spring piece at a position close to the second end.

[0008] Preferably, the dynamic spring piece has a plurality of shunt copper pieces and at least one elastic reinforcing piece stacked in sequence.

[0009] Preferably, the shunt copper piece and the elastic reinforcing piece have a U-shaped bending part at the same position, and the shunt copper piece and the elastic reinforcing piece have a gap at the U-shaped bending part.

[0010] Preferably, the surface of the first lead-out sheet and the second lead-out sheet is provided with a limiting protrusion or a limiting hole for fixing with the shell.

[0011] The utility model has the advantages that the first lead-out sheet and the second lead-out sheet of the contact assembly adopt the split structure, the contact volume of the lead-out terminal and the hot tin in the tin furnace is significantly reduced during soldering, heat conduction is reduced, that is, the heat transferred to the relay through the contact assembly is reduced, the relay plastic parts are finally protected from melting, and the heat failure problem in the welding process of the magnetic latching relay and the PCB is overcome. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a perspective view of the utility model embodiment.

[0013] Fig. 2 It is a front view of the utility model embodiment (the upper cover is hidden).

[0014] Fig. 3 It is a schematic view of the contact assembly in the utility model embodiment.

[0015] The shell 1 is provided with an electromagnetic driving assembly 2, an armature assembly 3, a push card 4 and a contact assembly 5.

[0016] The electromagnetic driving assembly 2 is provided with a coil 201, a magnetic core 202 and a spring 203.

[0017] The armature assembly 3 is provided with a fixed iron core 301 and a movable iron core 302.

[0018] The push card 4 is provided with a fixed iron core 401 and a movable iron core 402.

[0019] The contact assembly 5 is provided with a first lead-out sheet 501, a second lead-out sheet 502, a static contact 503, a dynamic contact 504, a dynamic spring sheet 505, a shunt copper sheet 506, an elastic reinforcing sheet 507, a limiting protrusion 508 and a limiting hole 509. DETAILED DESCRIPTION

[0020] The utility model will be further described in combination with the embodiments and the drawings.

[0021] In the embodiments, as shown in the drawings, the utility model discloses a magnetic latching relay. Figs. 1-3As shown, it is a PCB-mounted magnetic latching relay, including an electromagnetic drive assembly 2, an armature assembly 3, a push card 4 and a contact assembly 5 arranged in the shell 1, the armature assembly 3 drives the push card 4 to drive the contact assembly 5 to open or close, the contact assembly 5 has a first lead-out sheet 501 and a second lead-out sheet 502 leading out of the shell 1, the end of the first lead-out sheet 501 and the second lead-out sheet 502 outside the shell 1 has a fork structure. The first lead-out sheet 501 and the second lead-out sheet 501 of the contact assembly 5 in this embodiment adopt a fork structure, which significantly reduces the contact volume of the lead-out terminal with hot tin in the tin furnace during soldering, reduces heat conduction, that is, reduces the heat transmitted to the relay through the contact assembly 5, finally protects the plastic parts of the relay from melting, and overcomes the heating failure problem in the soldering process of the magnetic latching relay and the PCB.

[0022] In the embodiment, as shown in Figs. 1-3 The end of the first lead-out sheet 501 and the second lead-out sheet 502 has at least four fork branches, and the front end of the fork branch is provided with a chamfer. In addition to overcoming the heating failure problem in the soldering process of the magnetic latching relay and the PCB, the fork branch design can also significantly increase the total contact area of the soldering area, enhance the filling effect of soldering at the connection point, provide more secure soldering strength, and reduce the risk of false soldering. The chamfer design of the fork branch helps the soldering tin to flow during the soldering process, so that the soldering tin can be uniformly distributed to form a high-quality soldering connection, ensure good electrical performance, thereby reducing the contact resistance and improving the reliability of the overall magnetic latching relay. The fork branch design also makes the structure after soldering more stable, and can effectively prevent the soldering point from loosening due to mechanical vibration or thermal expansion as the service life is prolonged, thereby enhancing the long-term reliability of the magnetic latching relay.

[0023] In the embodiment, as shown in Figs. 2-3 The contact assembly 5 further includes a static contact 503, a dynamic contact 504 and a dynamic spring sheet 505, the first end of the dynamic spring sheet 505 is fixedly connected to the second lead-out sheet 502, the second end is clamped with the push card 4, the static contact 503 is fixedly connected to the first lead-out sheet 501, and the dynamic contact 504 is fixed to the dynamic spring sheet 505 at a position close to the second end. The contact assembly 5 of this embodiment provides a solid guarantee for the effectiveness and safety of the magnetic latching relay in actual application in terms of improving the reliability of current transmission, enhancing mechanical durability, stabilizing contact performance, high current carrying capacity, simplifying installation and maintenance, and effectively preventing faults.

[0024] In the embodiment, as shown in Figs. 2-3As shown, the moving spring sheet 505 has a plurality of current distribution copper sheets 506 and at least one elastic reinforcing sheet 507 stacked in sequence. The current distribution copper sheet 506 and the elastic reinforcing sheet 507 have a U-shaped bending portion at the same position, and the current distribution copper sheet 506 and the elastic reinforcing sheet 507 have a gap at the U-shaped bending portion. The moving spring sheet 505 of the embodiment has the advantages of enhancing current distribution capacity, improving elasticity and buffering performance, reducing contact resistance, reducing heat generation, supporting higher frequency operation, and improving operation stability, etc.

[0025] In the embodiment, as shown, Fig. 3 The surfaces of the first lead-out sheet 501 and the second lead-out sheet 502 are provided with limiting protrusions 508 or limiting holes 509 for fixing with the shell 1. By providing the limiting protrusions 508 or the limiting holes 509 on the surfaces of the first lead-out sheet 501 and the second lead-out sheet 502, the connection and fixation between the shell 1 and the moving spring sheet 505 can be effectively ensured, and the loosening of the connection caused by mechanical vibration or temperature change during use can be prevented, thereby improving the stability and safety of the overall structure, preventing potential safety hazards such as short circuit or poor contact caused by loosening.

[0026] Obviously, the above-mentioned embodiments of the utility model are only examples for illustrating the utility model, and are not a limitation on the embodiments of the utility model. Other obvious changes or variations derived from the essential spirit of the utility model still belong to the protection scope of the utility model.

Claims

1. A magnetic latching relay mounted on a PCB, comprising an electromagnetic drive assembly (2), an armature assembly (3), a pusher (4), and a contact assembly (5) disposed within a housing (1), wherein the armature assembly (3) drives the pusher (4) to open or close the contact assembly (5), characterized in that, The contact assembly (5) has a first lead-out piece (501) and a second lead-out piece (502) extending out of the housing (1), and the ends of the first lead-out piece (501) and the second lead-out piece (502) located outside the housing (1) have a forked structure.

2. The magnetic latching relay mounted on a PCB according to claim 1, characterized in that, The ends of the first lead-out piece (501) and the second lead-out piece (502) have at least four forks, and the front ends of the forks are chamfered.

3. The magnetic latching relay mounted on a PCB according to claim 1, characterized in that, The contact assembly (5) further includes a stationary contact (503), a moving contact (504), and a moving spring (505). The first end of the moving spring (505) is fixed to the second lead-out piece (502), and the second end is fixed to the push card (4). The stationary contact (503) is fixed to the first lead-out piece (501), and the moving contact (504) is fixed on the moving spring (505) near the second end.

4. The magnetic latching relay mounted on a PCB according to claim 3, characterized in that, The moving spring (505) has a plurality of shunt copper sheets (506) stacked in sequence and at least one elastic reinforcing sheet (507).

5. The magnetic latching relay mounted on a PCB according to claim 4, characterized in that, The shunt copper sheet (506) and the elastic reinforcing sheet (507) have a U-shaped bend at the same position, and the shunt copper sheet (506) and the elastic reinforcing sheet (507) have a gap in the U-shaped bend.

6. The magnetic latching relay mounted on a PCB according to claim 1, characterized in that, The surfaces of the first lead-out piece (501) and the second lead-out piece (502) are provided with limiting protrusions (508) or limiting holes (509) for fixing to the housing (1).

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