Magnetic latching relay with electromagnetic shielding function

Abstract

The utility model discloses a magnetic latching relay with an electromagnetic shielding function, which comprises an electromagnetic driving assembly, an armature assembly, a pushing card and a plurality of contact assemblies which are arranged in a shell, the armature assembly drives the pushing card to drive the contact assemblies to open or close, and an electromagnetic shielding layer is arranged on the outer wall of the shell at a position close to the electromagnetic driving assembly. According to the utility model, the electromagnetic shielding layer is arranged on the outer wall of the shell, and the electromagnetic driving assembly is adjusted to be arranged in the middle in the shell, so that electromagnetic signals can be blocked, and interference of an external magnetic field to the relay can be effectively shielded; and meanwhile, electromagnetic interference caused by external sensitive components when the relay works can be weakened, the influence of electromagnetic radiation on surrounding electronic equipment is reduced, and the stability and reliability of the whole system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to relay technology field, concretely relates to a magnetic latching relay with electromagnetic shielding function. BACKGROUND

[0002] Relay is a common and widely used in electrical control field switching device, its structure generally by electromagnet and a group of contact point composition. The operation principle of relay is based on electromagnetic induction, when electromagnet is electrified, will produce magnetic field in its coil, this magnetic field will attract the contact point of connection and close, thereby realize the conduction of current, when the coil same reverse electricity, coil produces reverse magnetic field, with magnetic steel together can make relay contact point open. Therefore, relay can pass through control small current to switch the on-off of big current, bear the switching, protection and regulation function of circuit in automatic control system.

[0003] However, with the increasingly miniaturization and integration of electronic equipment, the problem of electromagnetic interference (EMI) in external environment is increasingly prominent, which brings challenges to the normal work of magnetic latching relay. The influence of external magnetic field on relay can be divided into several aspects: external magnetic field leads to misoperation of relay; external magnetic field makes relay unable to maintain its original state, leading to failure or unstable work of relay; external magnetic field interference makes the contact surface appear arc, welding or corrosion phenomenon, leading to shortening of contact life and unstable work of relay.

[0004] On the other hand, during the working process of relay, the electromagnetic wave and magnetic field generated by its coil will also have an impact on the surrounding electronic equipment, which is particularly evident in high-frequency environment. These electromagnetic waves and magnetic fields may interfere with the normal operation of surrounding electronic components, especially for wireless communication equipment, sensors and other microelectronic devices that rely on accurate current and voltage, causing potential negative effects; when the relay is quickly attracted or released, it will cause transient current fluctuation, which can be propagated to other circuits through power lines, signal lines, etc., leading to misoperation or performance decline; when switching large load circuit, the arc effect of relay contact point will be more obvious, the generation of arc will not only cause the dramatic change of transient current and voltage, but also produce high-frequency interference pulse, which further affects the normal work of sensitive equipment nearby.

[0005] Therefore, in view of the problem of relay interference by external magnetic field and electromagnetic interference to the outside, it is particularly important to design an effective suppression scheme to ensure the normal operation of relay in various applications and the safety of surrounding equipment. UTILITY MODEL CONTENT

[0006] In order to overcome the problem of existing relay interference by external magnetic field and electromagnetic interference to the outside, the utility model provides a magnetic latching relay with electromagnetic shielding function.

[0007] The utility model discloses a technical scheme as follows: A magnetic latching relay with electromagnetic shielding function, including setting in the electromagnetic drive subassembly of casing, armature subassembly, push card and a plurality of contact subassembly, armature subassembly drive push card drive contact subassembly open or close, the outer wall of casing is provided with electromagnetic shielding layer in the position close to electromagnetic drive subassembly.

[0008] The shell includes a bottom shell and an upper cover, an L-shaped metal plate is mounted on the outside of the bottom shell, one limb of the metal plate is attached to the bottom plate of the bottom shell, and the other limb is attached to the side plate of the bottom shell close to the electromagnetic drive assembly, a shielding sticker is attached to the upper cover corresponding to the position of the electromagnetic drive assembly, and the metal plate and the shielding sticker together form the electromagnetic shielding layer.

[0009] The electromagnetic drive assembly includes an integrated iron core, a coil holder and a coil, L-shaped yokes are mounted at both ends of the iron core, and the end portions of the yokes form adsorption ends that open and close the armature assembly.

[0010] The armature assembly includes an intermediate layer of armature blocks, two side magnetic pole pieces and an external armature sleeve, the middle part of the armature sleeve is hinged to the shell, and together forms a lever structure, an integral swing protrusion is provided on the armature sleeve, and after the swing protrusion is inserted into the first clamping groove on the push card, the push card is driven to move.

[0011] The push card and the coil of the electromagnetic drive assembly are arranged in parallel, and at least one set of contact assemblies is arranged at each end of the electromagnetic drive assembly.

[0012] The contact assembly includes a first lead-out sheet, a second lead-out sheet, a static contact, a dynamic contact and a dynamic spring sheet, the first lead-out sheet and the second lead-out sheet are fixed to the shell and extend outside the shell, the first end of the dynamic spring sheet is fixed to the second lead-out sheet, the second end is clamped in the second clamping groove of the push card, the static contact is fixed to the first lead-out sheet, and the dynamic contact is fixed to the dynamic spring sheet at a position close to the second end.

[0013] The dynamic spring sheet has a plurality of shunt copper sheets and at least one elastic reinforcing sheet stacked in sequence.

[0014] The shunt copper sheet and the elastic reinforcing sheet have a U-shaped bending portion at the same position, and the shunt copper sheet and the elastic reinforcing sheet have a gap at the U-shaped bending portion.

[0015] At least one auxiliary switch is installed in the shell, and a protruding portion for triggering the auxiliary switch is provided on the push card.

[0016] The utility model discloses have following beneficial effect: through setting electromagnetic shielding layer on the outer wall of shell, form electromagnetic shielding layer on the outer wall of shell, can block electromagnetic signal, thereby effectively shielding outside magnetic field to relay's interference, can also weaken the electromagnetic interference that relay works to external sensitive component device causes, reduce the influence of electromagnetic radiation to surrounding electronic equipment, improved the stability and reliability of whole system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the three-dimensional schematic view of the utility model embodiment.

[0018] Figure 2 It is the three-dimensional schematic view of another angle of the utility model embodiment.

[0019] Figure 3 It is the structural schematic view of the utility model embodiment (hidden upper cover).

[0020] Figure 4 It is the structural schematic view of the utility model embodiment (hidden bottom shell and upper cover).

[0021] Figure 5 It is the schematic view of armature assembly in the utility model embodiment.

[0022] Figure 6 It is the schematic view of push card in the utility model embodiment.

[0023] Figure 7 It is the schematic view of contact assembly in the utility model embodiment.

[0024] Electromagnetic drive assembly 1, coil holder 101, yoke iron 102;

[0025] Armature assembly 2, armature block 201, magnetic pole piece 202, armature sleeve 203, swing protrusion 204;

[0026] Push card 3, first clamping groove 301, second clamping groove 302, protruding part 303;

[0027] Contact assembly 4, first lead-out sheet 401, second lead-out sheet 402, static contact 403, dynamic contact 404, dynamic spring sheet 405, shunt copper sheet 406 and at least one elastic reinforcing sheet 407;

[0028] Bottom shell 5;

[0029] Upper cover 6;

[0030] Metal plate 7;

[0031] Shielding sticker 8

[0032] Auxiliary switch 9. DETAILED DESCRIPTION

[0033] The utility model will be further described below in combination with the embodiments and drawings.

[0034] In the embodiment, as shown in Figure 1 , 2 , it is a magnetic latching relay with electromagnetic shielding function, including setting in the electromagnetic drive assembly 1 of casing, armature assembly 2, push card 3 and several contact assemblies 4, armature assembly 2 drives push card 3 to drive contact assembly 4 to open or close, the outer wall of casing is provided with electromagnetic shielding layer in the position close to electromagnetic drive assembly 1. Specifically, the casing includes bottom shell 5 and upper cover 6;The outside of bottom shell 5 is installed with L-shaped metal plate 7, one limb of metal plate 7 is attached to the bottom plate of bottom shell 5, and the other limb is attached to the side plate close to electromagnetic drive assembly 1 of bottom shell 5;Shielding sticker 8 is pasted on the position corresponding to electromagnetic drive assembly 1 on upper cover 6;Metal plate 7 and shielding sticker 8 together constitute electromagnetic shielding layer. This embodiment includes the design of L-shaped metal plate 7 and shielding sticker 8, forms electromagnetic shielding layer on the outer wall of casing, can block electromagnetic signal, thereby effectively shielding the interference of external magnetic field to relay;Meanwhile, it can also weaken the electromagnetic interference caused by relay to external sensitive components during operation, reduce the influence of electromagnetic radiation on surrounding electronic equipment, improve the stability and reliability of the whole system.

[0035] In the embodiment, as shown in Figures 3-6 , electromagnetic drive assembly 1 includes the iron core, coil holder 101 and coil installed as a whole, the L-shaped yoke iron 102 is installed at both ends of the iron core, and the end of yoke iron 102 forms the adsorption end that opens and closes with armature assembly 2. Armature assembly 2 includes armature block 201 of middle layer, magnetic pole piece 202 on both sides and outer armature sleeve 203, the middle part of armature sleeve 203 is hinged on the casing, and together forms a lever structure;Armature sleeve 203 is provided with integral swing protrusion 204, after swing protrusion 204 is inserted into the first card slot 301 on push card 3, push card 3 is driven to move. The electromagnetic drive assembly 1 of this embodiment improves the generation and concentration effect of magnetic field by optimizing the magnetic circuit structure, ensures that the relay can be quickly and effectively attracted when energized, thereby shortening the response time and improving the efficiency of switch. The structure of armature assembly 2 can provide greater mechanical stability and flexibility during operation, ensure that the assembly maintains balance during opening and closing, reduce the risk of wear and tear, and prolong the service life. The cooperation of armature assembly 2 and push card 3 ensures that push card 3 can move smoothly, thereby realizing reliable opening and closing.

[0036] In the embodiment, as shown in Figure 3 , Figure 4As shown, the push card 3 is arranged in parallel with the coil of the electromagnetic drive assembly 1, and at least one set of contact assemblies 4 is arranged at each end of the electromagnetic drive assembly 1. This structure adjusts the position of the electromagnetic drive assembly 1 in the shell, so that the electromagnetic drive assembly 1 is arranged as centrally as possible, so that the electromagnetic drive assembly 1 can better benefit from the shielding measures, further reduces the influence of electromagnetic interference on the environment, and improves the stability of the surrounding equipment.

[0037] In the embodiment, as shown in the drawings, Figure 7 The contact assembly 4 includes a first lead-out sheet 401, a second lead-out sheet 402, a static contact 403, a dynamic contact 404, and a dynamic spring sheet 405. The first lead-out sheet 401 and the second lead-out sheet 402 are fixed to the shell and extend out of the shell. The first end of the dynamic spring sheet 405 is fixed to the second lead-out sheet 402, and the second end is clamped in the second clamping groove 302 of the push card 3. The static contact 403 is fixed to the first lead-out sheet 401, and the dynamic contact 404 is fixed to the dynamic spring sheet 405 at a position close to the second end. The contact assembly 4 of the embodiment improves the reliability of current transmission, enhances mechanical durability, stabilizes contact performance, has high current carrying capacity, simplifies installation and maintenance, and effectively prevents faults, thereby providing a solid guarantee for the effectiveness and safety of the relay in actual application.

[0038] In the embodiment, as shown in the drawings, Figure 7 The dynamic spring sheet 405 has a plurality of shunt copper sheets 406 and at least one elastic reinforcing sheet 407 stacked in sequence. The shunt copper sheet 406 and the elastic reinforcing sheet 407 have a U-shaped bending portion at the same position, and the shunt copper sheet 406 and the elastic reinforcing sheet 407 have a gap at the U-shaped bending portion. The dynamic spring sheet 405 of the embodiment has the advantages of enhancing current shunt capacity, improving elasticity and buffering performance, reducing contact resistance, reducing heat generation, supporting higher frequency operation, and improving operation stability.

[0039] In the embodiment, as shown in the drawings, Figure 3 , Figure 4 At least one auxiliary switch 9 is installed in the shell, and the push card 3 is provided with a protruding portion 303 for triggering the auxiliary switch 9. In the embodiment, the auxiliary switch 9 is opened and closed by the push card 3, so that the auxiliary switch 9 is synchronized or asynchronous with the contact assembly 4, thereby meeting the integrated installation requirements of the electric meter or other scenes.

[0040] Obviously, the above embodiments of the utility model are only examples for illustrating the utility model, and are not limited to 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 with electromagnetic shielding function, comprising an electromagnetic drive assembly (1), an armature assembly (2), a pusher (3), and a plurality of contact components (4) disposed within a housing, wherein the armature assembly (2) drives the pusher (3) to open or close the contact components (4), characterized in that: An electromagnetic shielding layer is arranged on the outer wall of the shell near the electromagnetic drive assembly (1).

2. The magnetic latching relay having an electromagnetic shielding function according to claim 1, characterized by, The shell comprises a bottom shell (5) and an upper cover (6); an L-shaped metal plate (7) is mounted on the outer portion of the bottom shell (5), one limb of the metal plate (7) is attached to the bottom plate of the bottom shell (5), and the other limb is attached to the side plate of the bottom shell (5) near the electromagnetic drive assembly (1); a shielding sticker (8) is attached to the upper cover (6) corresponding to the position of the electromagnetic drive assembly (1); the metal plate (7) and the shielding sticker (8) together form the electromagnetic shielding layer.

3. The magnetic latching relay having an electromagnetic shielding function according to claim 1, characterized by, The electromagnetic drive assembly (1) comprises an integrated iron core, a coil holder (101) and a coil, L-shaped yoke iron (102) is mounted at both ends of the iron core, and the end of the yoke iron (102) forms an adsorption end that is opened and closed with the armature assembly (2).

4. The magnetic latching relay having an electromagnetic shielding function according to claim 1, characterized by, The armature assembly (2) comprises an intermediate layer of armature block (201), two sides of magnetic pole piece (202) and outer armature sleeve (203), the armature sleeve (203) is hinged in the middle of the shell, and a lever structure is formed together; the armature sleeve (203) is provided with an integrated swing protrusion (204), after the swing protrusion (204) is inserted into the first clamping groove (301) on the push card (3), the push card (3) is driven to move.

5. The magnetic latching relay having an electromagnetic shielding function according to claim 1, characterized by, The push card (3) is arranged in parallel with the coil of the electromagnetic drive assembly (1), and at least one set of the contact assembly (4) is arranged at each end of the electromagnetic drive assembly (1).

6. The magnetic latching relay having an electromagnetic shielding function according to claim 1 or 5, characterized by, The contact assembly (4) comprises a first lead-out sheet (401), a second lead-out sheet (402), a static contact (403), a dynamic contact (404) and a dynamic spring sheet (405). The first lead-out sheet (401) and the second lead-out sheet (402) are fixed to the shell and extend outside the shell. The first end of the dynamic spring sheet (405) is fixed to the second lead-out sheet (402), and the second end is clamped in the second clamping groove (302) of the push card (3). The static contact (403) is fixed to the first lead-out sheet (401), and the dynamic contact (404) is fixed to the dynamic spring sheet (405) at a position close to the second end.

7. The magnetic latching relay having an electromagnetic shielding function according to claim 6, characterized by, The dynamic spring sheet (405) has a plurality of shunt copper sheets (406) and at least one elastic reinforcing sheet (407) stacked in sequence.

8. The magnetic latching relay having an electromagnetic shielding function according to claim 7, characterized by, The shunt copper sheet (406) and the elastic reinforcing sheet (407) have a U-shaped bending portion at the same position, and the shunt copper sheet (406) and the elastic reinforcing sheet (407) have a gap at the U-shaped bending portion.

9. The latching relay having an electromagnetic shield function according to claim 1, wherein At least one auxiliary switch (9) is mounted in the shell, and a protruding portion (303) for triggering the auxiliary switch (9) is arranged on the push card (3).

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