CN115036176A - Electromagnetic relay capable of preventing contact adhesion - Google Patents

Abstract

The invention discloses an electromagnetic relay for preventing contact adhesion, which comprises a base, a magnetic circuit part and a contact part, wherein the magnetic circuit part is arranged on the base, the contact part comprises a push card and at least one contact unit, the contact unit comprises at least one rigid movable reed and at least one static reed part arranged on the base, the static reed part comprises a flexible static reed and a limiting part, the rigid movable reed is fixed on the push card, and the push card is driven by an armature iron of the magnetic circuit part; the limiting part is fixed on the base and/or the flexible static reed, and the limiting part limits the degree of deformation of the flexible static reed to the direction of the corresponding movable contact, so that the flexible static reed can meet the requirement of contact overtravel through flexible characteristics, and meanwhile, the static contact and the movable contact can be prevented from being adhered. The invention solves the problem that the dynamic spring is easy to generate fatigue fracture due to frequent high stress deformation, so that the structure reliability is poor, and simultaneously plays a role in preventing contact adhesion.

Description

Electromagnetic relay capable of preventing contact adhesion

Technical Field

The invention relates to a relay, in particular to an electromagnetic relay capable of preventing contact adhesion.

Background

An electromagnetic relay is an electronic control device, which is usually applied in an automatic control circuit, and is actually an 'automatic switch' which uses a small current to control a large current, so that the electromagnetic relay plays roles of automatic regulation, safety protection, circuit switching and the like in the circuit.

The electromagnetic relay in the prior art generally comprises a base, a magnetic circuit part and a contact part, wherein a rigid static spring is mostly used for matching with a flexible movable spring, on one hand, the movable spring is a bent flexible sheet, and when a bending angle is large, the bending precision is not high, and the structural stability is poor; when the bending angle is small, the movable spring plate is frequently subjected to high stress deformation under the condition of meeting the requirement of contact overtravel, so that the movable spring plate is easy to generate fatigue fracture and has poor structural reliability.

Most of contact parts of the electromagnetic relay in the prior art do not have the function of preventing contact adhesion, and when the contact is not broken completely and adhesion occurs, electric arcs are easy to generate, and potential safety hazards exist.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides the electromagnetic relay for preventing the contact adhesion, which can prevent the contact adhesion on the basis of improving the structural reliability of the movable spring piece.

The technical scheme adopted by the invention for solving the technical problems is as follows: an electromagnetic relay for preventing contact adhesion comprises a base, a magnetic circuit part and a contact part, wherein the magnetic circuit part is arranged on the base; the contact part comprises a push card and at least one contact unit, the contact unit comprises at least one rigid movable reed provided with a movable contact and at least one static reed part arranged on the base, the static reed part comprises a flexible static reed provided with a static contact and a limiting part, the rigid movable reed is fixed on the push card, and the push card is driven by the armature of the magnetic circuit part to enable the movable contact on the rigid movable reed to be in contact with or separated from the static contact on the flexible static reed; the limiting part is arranged on the base and/or the flexible static reed, and the limiting part limits the degree of deformation of the flexible static reed to the direction of the corresponding movable contact, so that the flexible static reed can meet the requirement of over-travel of the contact through the flexible characteristic and can prevent the static contact and the movable contact from being adhered.

Furthermore, the limiting part is a static spring leading-out sheet of the static spring part and is electrically connected with the flexible static spring sheet.

Furthermore, the limiting part is matched with one side of the flexible static spring piece facing to the corresponding movable contact, the limiting part abuts against the flexible static spring piece, and the matching point of the limiting part and the flexible static spring piece is located below the static contact.

Furthermore, the top of the limiting part is a bending section, the upper end of the bending section props against the flexible static reed, and the rest part of the bending section and the flexible static reed have a space.

Further, the rigid movable reed comprises a main piece and a plurality of supporting pieces which are integrally formed, the main piece is fixed on the pushing card, the plurality of supporting pieces are arranged at intervals along the moving direction of the pushing card, each supporting piece extends downwards and is provided with the movable contact, and each movable contact on the rigid movable reed faces to the same side of the pushing card in the moving direction; each support is respectively matched with one flexible static reed and a static contact on the flexible static reed, so that the rigid dynamic reed and the flexible static reed matched with the rigid dynamic reed form a plurality of contact pairs in a serial connection mode.

Furthermore, the number of the supporting pieces is two, so that the rigid movable spring leaf is in an inverted U shape.

Furthermore, the contact unit comprises a plurality of rigid movable reeds and a plurality of flexible static reeds, the plurality of rigid movable reeds are arranged at intervals along the movement direction of the pushing card, a part of rigid movable reeds and the flexible static reeds matched with the rigid movable reeds form a normally open contact pair, and the other rigid movable reeds and the flexible static reeds matched with the rigid movable reeds form a normally closed contact pair.

Furthermore, two adjacent flexible static reeds in the moving direction of the pushing card share the same limiting piece; the limiting piece shared by two adjacent flexible static reeds is Y-shaped.

Furthermore, the number of the contact units is multiple, and the multiple groups of contact units are arranged at intervals along the direction vertical to the movement direction of the push card; the base is provided with an arc barrier which separates adjacent contact units; the arc barrier and the base are integrally formed, or the arc barrier and the base are mutually separated, and the arc barrier is arranged on the base.

Furthermore, one or more elastic pieces are abutted between the pushing card and the base or the magnetic circuit part, and the elastic pieces provide counter force opposite to the attraction direction of the armature iron for the pushing card; the position of the elastic piece matched with the pushing card is equivalent to the horizontal position of the movable contact in contact with the fixed contact; the elastic piece is a spring.

Further, the magnetic circuit part comprises a coil assembly and the armature, the coil assembly is horizontal, the armature is arranged on one side of the coil assembly in the axial direction in a swinging mode, and the bottom of the armature is fixed with the pushing card; the coil component is provided with a limiting frame, and the bottom of the limiting frame is matched with the pushing card and/or the armature so as to limit the stroke of the armature moving towards the direction far away from the coil component.

Furthermore, the limiting frame is in an inverted U shape, two sides of the limiting frame are respectively matched with two sides of the armature in the width direction, and the bottoms of two sides of the limiting frame are respectively matched with the pushing clamp.

Compared with the prior art, the invention has the following beneficial effects:

1. the rigid movable spring leaf and the flexible static spring leaf are matched with the push card to realize the closing or breaking of the contact, so that the problem of poor structural reliability caused by the fact that the movable spring leaf is easy to fatigue fracture due to frequent high-stress deformation is solved, and meanwhile, the deformation of the flexible static spring leaf only needs to meet the overtravel of the contact, so that the deformation is small, the stress level is low, and the requirement of high durability is met. In addition, the setting of locating part can provide spacingly to flexible stationary reed, plays the effect that prevents the contact adhesion to can stop the potential safety hazard.

2. The rigid movable spring plate and the pushing card are rigidly fixed, so that the bad phenomenon that the contact is polluted by foreign matters generated by frequent rotating and abrasion of the rotating shaft due to the connection of the conventional movable spring plate and the pushing card through the rotating shaft is avoided, and the contact reliability of the contact is higher.

3. The limiting piece is a static spring leading-out piece of the static spring part and is electrically connected with the flexible static spring piece, so that the limiting piece and the static spring leading-out piece are combined into a whole, one part can be reduced, the material cost is saved, the installation can be simplified, and the integral structure is more compact and the volume is smaller.

4. The top of the limiting piece is provided with a bending section, the upper end of the bending section is propped against the flexible static reed, and the rest part of the bending section and the flexible static reed are spaced, so that the contact clearance and the over-travel can be adjusted by adjusting the bending degree of the bending section of the limiting piece.

5. The rigid movable spring plate comprises the main plate and a plurality of supporting plates, so that the rigid movable spring plate and the flexible static spring plate matched with the rigid movable spring plate form a plurality of contact pairs in a series connection mode, on one hand, the rigid movable spring plate has a plurality of contact pairs and has a forced guiding function on the basis of the limiting part, and on the other hand, the series connection mode of the contact pairs can obviously increase contact gaps on the premise of not increasing the structure volume, thereby greatly improving the breaking capacity of the rigid movable spring plate. In addition, each support piece of the rigid movable spring plate is equivalent to a traditional rigid movable spring plate, the plurality of support pieces are fixed on the main piece together, and the main piece and the pushing card are used for fixing, so that each support piece does not need to be independently installed, the installation process of the rigid movable spring plate is simplified, the installation space required by the rigid movable spring plate can be reduced, the structure is more compact, the size is smaller, and the miniaturization of a product is facilitated.

6. One or more elastic pieces are connected between the pushing card and the base in an abutting mode, and the elastic pieces are used for providing the pushing card with attraction directions opposite to that of the armature ironThe elastic part is a spring, so that the invention completely converts the frequent high-stress deformation of the existing movable spring into the spring deformation with excellent elastic property (the spring can realize 10 by material verification) ⁸ Secondary compression set) to significantly improve the reliability of the structure. The position of the elastic piece matched with the pushing card is equivalent to the horizontal position of the movable contact in contact with the fixed contact, so that the counter force of the elastic piece can directly act on the position of the contact, the contact reliability of the contact is higher, and the structure has stronger impact and vibration bearing capacity.

7. The base is provided with the arc barrier, and the arc barrier can not cause the inter-group misconnection under the condition that the movable contact falls off or the rigid movable spring is broken, so that the inter-group reliability of the structure is further improved; the arc-isolating grid can separate contacts among different groups, so that the electrical insulation among the groups is met, and the effect is obvious particularly when one or more groups of loops switch large loads and the other one or more groups switch signal loads; the arc barrier not only can separate the contacts between different groups to satisfy the electrical insulation between the groups, but also can increase the cooling area of the electric arc and improve the arc quenching capability.

8. The limiting frame can effectively relieve the impact force of the armature on the contact part under the conditions of strong impact and vibration, and particularly for a relay with a larger armature, the relay failure caused by the deformation of the contact part due to the impact can be effectively avoided.

The invention is further explained in detail with the accompanying drawings and the embodiments; however, the electromagnetic relay of the present invention, which is prevented from contact sticking, is not limited to the embodiment.

Drawings

FIG. 1 is a front view of the present invention in accordance with one embodiment;

FIG. 2 is a sectional view A-A of FIG. 1 according to an embodiment;

FIG. 3 is a side view of the present invention according to one embodiment;

FIG. 4 is a cross-sectional view B-B of FIG. 3 according to an embodiment;

FIG. 5 is a schematic perspective view of the assembled state of the base and the flexible static spring plate according to the first embodiment of the present invention;

FIG. 6 is a front view of the base, the flexible stationary spring and the position limiting member in an assembled state according to the first embodiment of the present invention;

FIG. 7 is a side view of the base with the flexible stationary spring and the position limiting member in an assembled state according to the first embodiment of the present invention;

FIG. 8 is a cross-sectional view C-C of FIG. 7 in accordance with one embodiment;

FIG. 9 is a front view of an armature and push-on card in an assembled state, in accordance with one embodiment of the present invention;

FIG. 10 is a schematic view of a flexible static spring sheet according to the present invention;

FIG. 11 is a schematic view showing the construction of another flexible static spring according to the embodiment of the present invention;

FIG. 12 is a schematic perspective view of a base according to the present invention;

FIG. 13 is a schematic perspective view of the base, the flexible stationary spring plate, and the arc barrier of the second embodiment of the present invention in an assembled state;

FIG. 14 is a top view of FIG. 13 according to the second embodiment;

FIG. 15 is a D-D sectional view of FIG. 14 according to the second embodiment;

FIG. 16 is a schematic perspective view of an arc chute according to a second embodiment of the present invention;

FIG. 17 is an overall sectional view of the present invention according to the second embodiment;

FIG. 18 is an enlarged view of section E in FIG. 17 according to the second embodiment;

FIG. 19 is an enlarged partial cross-sectional view of the base, the pin and the spring clip of the third embodiment of the present invention in an assembled state;

fig. 20 is a sectional view showing the base, the drawing pins, and the spring clip of the third embodiment of the present invention in an assembled state.

Detailed Description

The terms "first," "second," and the like, herein are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. In the description, the directions or positional relationships indicated by "up", "down", "left", "right", "front" and "rear" are used based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the scope of the present invention. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In addition, in the description of the present application, "a plurality" means two or more and "at least one" means one or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone.

Example one

Referring to fig. 1 to 12, an electromagnetic relay for preventing contact adhesion according to the present invention includes a housing 20, a base 1, a magnetic circuit portion 2, and a contact portion, wherein the magnetic circuit portion 2 is mounted on the base 1; the contact part comprises a push card 5 and at least one contact unit, the contact unit comprises at least one rigid movable spring piece 3 and at least one static spring part arranged on the base 1, the static spring part comprises a flexible static spring piece 4 and a limiting piece, the flexible static spring piece 4 is arranged on the base 1, the rigid movable spring piece 3 is fixed on the push card 5, the push card 5 is driven by an armature 21 of the magnetic circuit part 2, and a movable contact 31 arranged on the rigid movable spring piece 3 is contacted with or separated from a static contact 41 arranged on the flexible static spring piece 4; the limiting member is fixed to the base 1 and/or the flexible static spring piece 4, and the limiting member limits the degree of deformation of the flexible static spring piece 4 to the direction of the corresponding movable contact 31, so that the flexible static spring piece 4 can meet the contact overtravel through the flexible characteristic, and meanwhile, the static contact 41 and the movable contact 31 are prevented from being adhered. The rigid movable spring plate 3 can be fixed with the push card 5 by riveting or insert injection molding and the like.

In this embodiment, the limiting member is engaged with one side of the flexible static spring piece 4 facing the corresponding movable contact 31, and the limiting member abuts against the flexible static spring piece 4, and an engagement point of the limiting member and the flexible static spring piece 4 is located below the static contact 41. The top of the limiting member is a bending section 61, the upper end of the bending section 61 is abutted against the flexible static spring piece 4, and the rest part of the bending section 61 is spaced from the flexible static spring piece 4. Therefore, the position of the bending section 61 abutting against the flexible static reed 4 can be changed by adjusting the bending degree of the bending section 61 of the limiting member, so that the purpose of adjusting the gap and the overtravel of the contact is achieved.

In this embodiment, the limiting member is a static spring lead-out piece 6 of the static spring part and is electrically connected to the flexible static spring piece 4, so that the top of the static spring lead-out piece 6 is used for limiting the flexible static spring piece 4, and the lower part of the static spring lead-out piece 6 passes through the base 1 and serves as a lead-out pin of the flexible static spring piece 4. The static spring leading-out piece 6 and the flexible static spring piece 4 are electrically connected in a welding mode, but the method is not limited to the welding mode, and in other embodiments, the static spring leading-out piece and the flexible static spring piece are electrically connected in a riveting mode or other fixing modes. In other embodiments, the stopper is separate from the flexible static spring, and is a stopping sheet independently fixed on the base.

In this embodiment, as shown in fig. 8, the rigid movable spring 3 includes a main piece 32 and a plurality of support pieces 33 that are integrally formed, the main piece 32 is fixed on the push card 5 (the main piece 32 is specifically fixed at the bottom of the push card 5 in a riveting manner, but is not limited thereto), the plurality of support pieces 33 are arranged at intervals along the moving direction of the push card 5, each support piece 33 extends downward and is provided with the movable contact 31, and each movable contact 31 on the rigid movable spring 3 faces the same side of the push card 5 in the moving direction; each support 33 is respectively matched with one flexible static reed 4 and a static contact 41 on the flexible static reed, so that the rigid dynamic reed 3 and the flexible static reed 4 matched with the rigid dynamic reed form a plurality of contact pairs in a serial form. The series connection form of the contact pairs can obviously increase the contact gaps on the premise of not increasing the structure volume, thereby greatly improving the breaking capacity of the invention. The number of the supporting pieces 33 is two, so that the rigid movable spring plate 3 is in an inverted U shape. Therefore, the rigid movable spring piece 3 and the two flexible fixed spring pieces 4 cooperate to form two contact pairs in series, and in this case, the contact gap formed by each rigid movable spring piece 3 is L1+ L2, where L1 and L2 are the contact gaps of the two contact pairs, respectively, as shown in fig. 8. In other embodiments, the number of the branch pieces is three or more, and the like. The multiple supporting pieces of the rigid movable spring are jointly fixed on the main piece, and the main piece and the pushing clamp complete fixation, so that each supporting piece does not need to be independently installed, the installation process of the rigid movable spring is simplified, the installation space required by the rigid movable spring can be reduced, the structure is more compact, the size is smaller, and the miniaturization of a product is facilitated.

In this embodiment, the contact unit includes a plurality of rigid movable reeds 3 and a plurality of flexible stationary reeds 4, a plurality of rigid movable reeds 3 are arranged at intervals along the moving direction of the push card 5, and a part of the rigid movable reeds 3 and the flexible stationary reeds 4 matched therewith form a normally open contact pair, and the other rigid movable reeds 3 and the flexible stationary reeds 4 matched therewith form a normally closed contact pair. The number of the rigid movable reeds 3 is two, the four flexible static reeds 4 are matched, and the contact units form four contact pairs. The moving contacts 31 on the two rigid moving springs 3 face in opposite directions, so that one rigid moving spring 3 and two flexible static springs 4 form two normally open contact pairs, and the other rigid moving spring 3 and the other two flexible static springs 4 form two normally closed contact pairs.

In this embodiment, two adjacent flexible stationary spring pieces 4 in the moving direction of the push card 5 share the same limiting member. That is, two flexible static spring pieces 4 in the middle of the four flexible static spring pieces 4 share the same limiting piece (i.e., the static spring leading-out piece 6), the limiting piece is in a Y shape, and the left and right inclined sections at the top of the limiting piece respectively form the bending section 61. The limiting piece is positioned between the two middle flexible static reeds 4 and is electrically connected with the two middle flexible static reeds 4 by welding or riveting; the two flexible static reeds 4 in the middle are respectively long zigzag sheets, as shown in fig. 10. As shown in fig. 11, the two flexible stationary spring leaves 4 on both sides are long straight structure respectively, and the two flexible stationary spring leaves 4 on both sides are electrically connected with a limiting member (i.e. stationary spring leading-out piece 6) respectively, the bending section 61 of the limiting member includes two tilting sections and a vertical section located between the two tilting sections, the two tilting sections are located on the same side of the vertical end, and the tilting directions of the two tilting sections are opposite, and the high end of the upper tilting section is pressed against the part of the corresponding flexible stationary spring leaf 4 close to the stationary contact 41. The cross-sectional view of the stationary spring lead-out piece 6 corresponding to the two flexible stationary spring pieces 4 on both sides is substantially in the shape of a spoon as shown in fig. 8.

In this embodiment, the number of the contact units is multiple, and the multiple contact units are arranged at intervals along a direction perpendicular to the moving direction of the push card 5. The base 1 is provided with an arc barrier 9, and the adjacent contact units are separated by the arc barrier 9; the arc barrier 9 and the base 1 are integrally formed. The number of the contact units is specifically four, as shown in fig. 5 and 12, the arc barrier 9 includes three retaining walls 91, and each retaining wall 91 is used for separating adjacent contact units. The arc barrier 9 can not cause the inter-group misconnection under the condition that the movable contact 31 falls off or the rigid movable spring 3 is broken, and the reliability of the structure between the groups is further improved; the arc-isolating grid 9 can isolate the switching loops among the groups, so that the mutual interference of loads among the groups is reduced, and the effect is obvious particularly when one or more groups of loops switch large loads and the other group or groups switch signal loads. In addition, the arc barrier 9 can not only separate the contacts between different groups to satisfy the electrical insulation between the groups, but also increase the cooling area of the arc and improve the arc extinguishing capability.

In this embodiment, one or more elastic members are abutted between the push card 5 and the base 1 or the magnetic circuit portion 2, and the elastic members provide a reaction force opposite to the attracting direction of the armature 21 for the push card 5; the position where the elastic member is engaged with the push card 5 corresponds to the horizontal position where the movable contact 31 is in contact with the fixed contact 41, that is, the position where the elastic member is engaged with the push card 5 corresponds to or substantially corresponds to the horizontal position where the movable contact 31 is in contact with the fixed contact 41. The elastic part is specifically a spring 8, the spring 8 aims to promote the counter force of the structure, and under the condition that the electromagnetic relay loses or partially loses excitation, the spring 8 resists the electromagnetic attraction to realize contact switching. As shown in fig. 2, the number of the springs 8 is specifically two, but not limited thereto, each spring 8 is respectively horizontal, one end of each spring 8 is respectively sleeved on a first positioning column 221 correspondingly arranged on the below-described yoke 22, and the other end of each spring 8 is respectively sleeved on a second positioning column 51 correspondingly arranged on the push card 5. The counter force of the spring 8 can directly act on the position of the contact, so that the contact reliability of the contact is higher, and the structure has stronger capability of bearing impact and vibration.

In this embodiment, the magnetic circuit portion 2 includes a coil assembly and the armature 21, the coil assembly is horizontal, the armature 21 is swingably disposed on one side of the coil assembly in the axial direction, and the bottom of the armature 21 is fixed to the push clip 5; the coil assembly is provided with a limiting frame 7, and the bottom of the limiting frame 7 is matched with the pushing card 5 and/or the armature 21 so as to limit the stroke of the armature 21 moving in the direction away from the coil assembly. Specifically, the limiting frame 7 is in an inverted U shape, the top of the limiting frame is fixed to the upper surface of one horizontal side of a yoke 22, two sides of the limiting frame are respectively matched with two sides of the armature 21 in the width direction, two sides of the limiting frame 7 are respectively matched with the pushing clamp 5, and specifically, lap joint grooves matched with the pushing clamp 5 are respectively arranged at positions corresponding to two sides of the limiting frame 7 on the pushing clamp 5. The arrangement of the limiting frame 7 can effectively relieve the impact force of the armature 21 on the contact part of the relay under the conditions of strong impact and vibration, and particularly for the relay with a larger armature 21, the relay failure caused by the deformation of the contact part due to the impact can be effectively avoided.

In this embodiment, as shown in fig. 4, the coil assembly includes a coil frame 25, an enamel wire 26 wound around the coil frame 25, an iron core 27 inserted into the coil frame 25, an L-shaped yoke 22, and a restoring spring 24. The armature 21 is fitted to one axial side of the coil frame 25, one vertical side of the yoke 22 is fitted to the other axial side of the coil frame 25, and is fixed to one end of the iron core 27 facing the yoke 22 by riveting, welding, or the like, the bottom of one vertical side of the yoke 22 is fixedly connected to the base 1, and the first positioning column 221 is disposed on one vertical side of the yoke 22. One horizontal side of the yoke 22 is fitted over the bobbin 25, and one horizontal side of the yoke 22 extends in the direction of the armature 21 and is connected to the armature 21 via the return spring 24. The return spring piece 24 has a first side, a second side, and a bent portion provided between the first side and the second side, and specifically, the return spring piece 3 is substantially L-shaped. The first edge of the restoring spring 24 is specifically connected to the upper surface of the edge of the yoke 22 in the horizontal state, and the second edge of the restoring spring 24 is connected to the surface of the armature 21 opposite to the yoke 22. A first distance is reserved between the horizontal side of the armature 21 and the yoke 22; the lower surface of one horizontal side of the yoke 22 is provided with a magnetic conducting piece 23, and the magnetic conducting piece 23 protrudes out of the tail end of one horizontal side of the yoke 22 towards the direction of the armature 21. The armature 21 has an attraction state and a recovery state, and the armature 21 switches the state thereof through swinging; the armature 21 contacts the magnetic conductive member 23 in an attraction state, and a second distance is formed between the armature 21 and the magnetic conductive member 23 in a recovery state, wherein the second distance is smaller than the first distance. The armature 21 and the magnetic conductive member 23 are in surface contact in the contact state, but not limited to this, and in other embodiments, the armature and the magnetic conductive member are in line contact in the contact state.

In this embodiment, the magnetic conducting member 23 is connected to the inner surface of the horizontal side of the yoke 22, and the size of the second gap is adjustable. The material of the magnetic conducting member 23 may be the same as that of the yoke 22, and the magnetic conducting member 23 is a sheet, but is not limited thereto. In other embodiments, the flux conductor 23 is integrally formed with the yoke 22.

In this embodiment, a connection hole is formed in one horizontal side of the yoke 22, the magnetic conducting member 23 is connected to the one horizontal side of the yoke 22 by a fastening member penetrating through the connection hole, and the fastening member can move toward or away from the armature 21 relative to the connection hole, so as to adjust the second distance. The connection hole is a long hole, specifically, a waist-shaped hole, and is extended in a direction parallel to the axial direction of the coil bobbin 25. The fastener is specifically a screw 28, and is in threaded connection with the magnetic conduction member 23. In other embodiments, the fastener is a rivet that is riveted to the magnetic conductor 23. The number of the fastening members (i.e., screws) is two, but not limited thereto, and the two screws are arranged in line in the width direction of the armature 21.

In this embodiment, the restoring reed 24 is connected to the upper surface of the horizontal side of the yoke 22 by the fastening member (i.e., the screw 28), that is, the screw passes through the first side of the restoring reed 24 and the horizontal side of the yoke 22 in sequence, and then is screwed into the threaded hole formed in the magnetic conductive member 23. The corners of two sides of the restoring spring 24 are round corners, and the second side of the restoring spring 24 is riveted and fixed with the armature 21.

In this embodiment, the lower end of the outer shell 20 (see fig. 17) is open, the lower end of the outer shell 20 is connected with the base 1 in a snap-fit manner, and the magnetic circuit portion 2 and the contact portion are accommodated in a shell cavity enclosed by the outer shell 20 and the base 1.

In this embodiment, the present invention further includes a socket portion 29, and the socket portion 29 is mounted on the yoke 22, and specifically, the socket portion 29 is fixed to one side of the yoke 22 in a horizontal shape. The lamp holder part 29 is embedded with electronic components such as a coil protection element and an indicator light, and the electronic components and a part or all of the coil are connected in parallel to obtain electric energy. The coil rack 25 is provided with a plurality of soldering lugs, part of the soldering lugs are connected with coil leading-out pins through wires, the other soldering lugs are used as coil middle taps, a bus ring formed by the enameled wires 26 is divided into a plurality of sub-coils, and the sub-coils are respectively used for supplying power to electronic components of the lamp holder part 29.

In this embodiment, the leading-out pin of the static spring part and the leading-out pin (i.e., the coil leading-out pin) of the magnetic circuit part 2 respectively penetrate through the corresponding jack 11 arranged on the base 1, and the elastic fastener 10 is used for abutting against the limit, specifically, the elastic fastener 10 is arranged in the jack 11 of the base 1, and urges the leading-out pin to abut against the inner side surface of the jack 11, as shown in fig. 8, so that the leading-out pin is prevented from shaking in the jack 11, and the leading-out pin is also prevented from being provided with bracts or slash marks and the like which are used for interference fit with the jack 11, thereby preventing the plastic scraps from being wiped out. The elastic clamping piece 10 is smoothly matched with the inner side surface of the insertion hole 11, so that plastic scraps are further prevented from being generated. The elastic clamping piece 10 comprises at least one first arc-shaped bending part protruding towards the direction close to the leading-out pins and at least one second arc-shaped bending part protruding towards the direction far away from the leading-out pins, the first arc-shaped bending part and the second arc-shaped bending part are arranged along the depth direction of the jack 11, and the adjacent first arc-shaped bending part and the second arc-shaped bending part are in smooth transition, so that the elastic clamping piece is approximately in a wave shape.

According to the electromagnetic relay for preventing contact adhesion, when a certain excitation is applied to the magnetic circuit part 2, the push card 5 moves along with the armature 21 along the attraction direction with the iron core 27, so that a normally open contact pair is closed, and a normally closed contact pair is opened; when the magnetic circuit part 2 is de-energized, the push card 5 moves along with the armature 21 in the direction away from the iron core 27, so that the normally open contact pair is disconnected, the normally closed contact pair is closed, and the switching of the circuit is realized. In the process of removing excitation of the magnetic circuit part 2, the restoring reed 24 and the spring 8 can provide counter force to assist the armature 21 and the push card 5 to restore. Particularly, the invention completely converts the frequent high-stress deformation of the existing dynamic spring into the deformation of the spring 8 with excellent elastic performance (the spring 8 can realize 10 by material verification) ⁸ Secondary compression deformation) and significantly improves the reliability of the structure.

The flexible static reed 4 of the invention adopts a long flat sheet type or long Z-shaped design with larger flexibility, and the deformation of the flexible static reed 4 only needs to meet the overtravel of the contact (the deformation of the existing movable reed is the sum of the overtravel of the contact and the clearance of the contact), so the deformation is smaller, the stress level is low, and the requirement of high durability is met. With the quiet spring that flexible quiet reed 4 links to each other is drawn forth piece 6 is right flexible quiet reed 4 carries on spacingly, can prevent on the one hand that the contact from taking place the adhesion, and on the other hand can avoid when the fuse welding because of normally open contact pair or normally closed contact pair, opposite side normally closed contact pair or normally open contact pair switch-on return circuit, and simultaneously, this design can ensure that the corresponding side of fuse welding contact pair keeps certain safe distance, satisfies the compulsory direction function.

The armature and the yoke adopt a separation mode, so that the armature can be prevented from being contacted with the yoke to be abraded when acting, and the problem that the relay is blocked or contact is abnormal due to abrasion of a yoke knife edge is solved. The arrangement of the magnetic conducting piece can ensure that a closed magnetic loop can be formed in a state that the armature is separated from the yoke when the armature is attracted, so that the relay can reliably work, and the first distance is larger, so that corners (round corners) at two sides of the recovery reed can be designed to be larger, and the recovery reed can durably work and is not easy to break. In addition, the armature is also separated from the magnetic conduction piece in the recovery state, so that the armature cannot rotate by taking the magnetic conduction piece as a fulcrum immediately when acting, and the abrasion to the magnetic conduction piece is reduced; the armature and the magnetic conduction piece are in surface contact or line contact in a contact state, but not in point contact, so that the abrasion of the armature to the magnetic conduction piece can be further reduced; when the armature and the magnetic conduction piece are in a contact state, the weight of the whole armature and a contact system of the electromagnetic relay is borne by the recovery reed, and the magnetic conduction piece is not loaded, so that the abrasion of the magnetic conduction piece can be further reduced, and the permanent work of the magnetic conduction piece is ensured.

The size of the second distance is adjustable, so that the magnetic circuit fall of a magnetic circuit system of the relay can be adjusted according to the relative position of the magnetic conduction piece and the armature, and the over-stroke and the electrical parameters of a product can be adjusted. The magnetic circuit fall is the distance between the surface of the magnetic conducting piece, which is used for contacting the armature, and one end, used for connecting the second edge of the yoke, of the iron core of the magnetic circuit system. Specifically, the size of the second distance can be adjusted by adjusting the matching position of the magnetic conduction piece and the connecting hole (the waist-shaped hole), so that the purpose of adjusting the electrical and mechanical parameters of the product before the product is finished is achieved.

After the coil assembly adopts the structure, the magnetic conduction efficiency is high, the structural flexibility is realized, the working air gap and the magnetic circuit fall of the magnetic circuit part 2 can be changed by adjusting the relative positions of the parts, the action voltage and the release voltage of the product can be adjusted, and the problem that the product has poor correctability due to the fact that the adjustment space of the magnetic circuit part of the relay in the prior art is small or does not have the adjustment space is solved.

Example two

Referring to fig. 13-18, a difference between the electromagnetic relay for preventing contact adhesion according to the first embodiment of the present invention and the first embodiment is: the arc barrier 9 and the base 1 are separated from each other, and the arc barrier 9 is detachably mounted on the base 1.

In this embodiment, the arc-blocking fence 9 includes three strip-shaped retaining walls 91 and a side baffle 92, the three retaining walls 91 are arranged in parallel, one end of each retaining wall 91 is integrally formed with the same side of the side baffle 92, the other end of the retaining wall 91 in the middle is provided with a mounting post 911, and the mounting post 911 is inserted into and matched with a mounting hole 12 correspondingly arranged on the base 1, as shown in fig. 15. The side shield 92 is back to a side bottom of the retaining wall 91 is provided with one or more limit convex parts 921, the bottom of the inner side surface of the housing 20 is provided with limit grooves 201 corresponding to the limit convex parts 921 one to one, and the limit convex parts 921 are engaged with the limit grooves 201 one to one, as shown in fig. 17 and fig. 18, so as to limit the displacement of the arc-isolating fence 9 in the length direction of the retaining wall 91.

The electromagnetic relay for preventing contact adhesion is the same as the electromagnetic relay in the prior art or can be realized by the prior art.

EXAMPLE III

Referring to fig. 19 and fig. 20, the difference between the electromagnetic relay for preventing contact adhesion according to the first embodiment of the present invention and the first embodiment is: the elastic clamping piece 10 is connected with the leading-out pin 30 in a buckling way so as to prevent the elastic clamping piece 10 from falling out of the jack 11 of the base 1. The lead pin 30 may be a lead pin of a static spring portion or a coil lead pin of a magnetic circuit portion.

In this embodiment, the elastic clip 10 and/or the lead-out pin 30 is provided with a limiting part for limiting the lead-out pin 30 to move along the depth direction of the insertion hole 21, and the limiting part is abutted against the base 2. The insertion hole 21 is vertically through, the leading-out pin 30 is inserted into the insertion hole 11 from top to bottom, and the elastic clamping piece 10 is installed into the insertion hole 11 from the lower end of the insertion hole 11. The leading-out pins 30 are sheet-shaped pins, the cross sections of the leading-out pins are square, the elastic clamping piece 10 is located on one side of the leading-out pins 30 in the thickness direction, the part, far away from the leading-out pins 30, of the elastic clamping piece 10 in the thickness direction of the leading-out pins 30 is in contact fit with the inner side face of the insertion hole 11, and the elastic clamping piece 10 is in smooth fit with the inner side face of the insertion hole 11.

In this embodiment, as shown in fig. 19, the elastic clip 10 is provided with one or more wedge-shaped clips 103, the leading-out pin 30 is provided with clip holes 301 that are engaged with the wedge-shaped clips 103 one by one, and the clip holes 301 penetrate through two ends of the leading-out pin 30 in the thickness direction. The card hole 301 may be replaced by a card slot or the like. The number of the wedge-shaped latch 103 and the latch hole 301 is two, but not limited thereto. The two clamping holes 301 are arranged along the width direction of the leading-out pin 30, and the positions of the two wedge-shaped clamping blocks 103 correspond to the two clamping holes 301 one by one.

In this embodiment, as shown in fig. 19, the elastic clip 10 includes at least one first arc-shaped bending portion 101 protruding toward the direction close to the lead-out pin 30 and at least one second arc-shaped bending portion 102 protruding toward the direction away from the lead-out pin 30, the first arc-shaped bending portion 101 and the second arc-shaped bending portion 102 are alternately arranged along the depth direction of the insertion hole 11, the first arc-shaped bending portion 101 is located between the plurality of second arc-shaped bending portions 102, and the adjacent first arc-shaped bending portion 101 and the adjacent second arc-shaped bending portion 102 are in smooth transition. The number of the first arc-shaped bent portion 101 is specifically one, the number of the second arc-shaped bent portion 102 is two, but the invention is not limited thereto, and the first arc-shaped bent portion 101 is located between the two second arc-shaped bent portions 102. The first arc-shaped bent portion 101 is provided with the wedge-shaped latching block 103, and each second arc-shaped bent portion 102 is respectively in contact fit with the inner side surface of the insertion hole 11. Therefore, the elastic clamping piece 10 is approximately wave-shaped, so that the elastic deformation capacity of the elastic clamping piece 10 is better, and the smooth matching of the inner side surfaces of the elastic clamping piece 10 and the insertion hole 11 can be ensured.

In this embodiment, the insertion hole 11 includes a through hole 111 with two through ends and a sinking groove 112 with one open end and the other closed end, and the through hole 111 is laterally communicated with the sinking groove 112; the lead pin 30 is inserted into the through hole 111, and a portion of the lead pin 30 in the through hole 111 is adapted to the through hole 111, that is, a shape and a size of the portion of the lead pin 30 in the through hole 111 are consistent or substantially consistent with a shape and a size of the through hole 111, so that the lead pin 30 is not or substantially not displaced in the width direction and the thickness direction of the lead pin 30 in the through hole 111. Specifically, the lower end of the sinking groove 112 is open, the upper end is closed, and the elastic clip 10 is loaded into the sinking groove 112 from one end (i.e. the lower end) of the sinking groove 112 and is limited by the upper end of the sinking groove 112, so that the elastic clip 10 cannot move upwards in the sinking groove 112. The limiting portion is located at the other end of the insertion hole 11, and specifically, the limiting portion is located at the upper end of the insertion hole 11, as shown in fig. 6.

In this embodiment, as shown in fig. 20, the limiting portion includes two limiting steps 12, the two limiting steps 12 are respectively located at two sides of the leading-out pin 30, which are opposite to each other in the width direction, and step surfaces of the two limiting steps 12 respectively face the direction in which the depth of the insertion hole 11 is inward and respectively abut against the upper surface of the base 2, as shown in fig. 20. In other embodiments, the limiting part is a collar or the like sleeved on the pin.

When the leading-out pin 30 is assembled, the leading-out pin 30 is firstly inserted into the through hole 111 from top to bottom, then the wedge-shaped fixture block 103 of the elastic fixture 10 faces the leading-out pin 30, the elastic fixture 10 is arranged into the sinking groove 112 from bottom to top, in the process that the elastic fixture 10 is arranged into the sinking groove 112, the inclined surface of each wedge-shaped fixture block 103 of the elastic fixture 10 provides guidance, so that the elastic fixture 10 is smoothly arranged, and the elastic fixture 10 is in a compressed state, when the elastic fixture 10 is arranged in place, each wedge-shaped fixture block 103 of the elastic fixture 10 is respectively clamped into the corresponding clamping hole 301, as shown in figure 19, so that the elastic fixture 10 has the effect of stopping downwards, meanwhile, the elastic fixture 10 is elastically reset, each second arc-shaped bending part 102 of the elastic fixture 10 respectively contacts the inner side surface which is close to the sinking groove 112 and far away from the leading-out pin 30, and the first arc-shaped bending part 101 of the elastic fixture 10 abuts against the leading-out pin 30, the lead-out pins 30 are abutted against the inner side surface of the through hole 111 far away from the sinking groove 112, so that the lead-out pins 30 are more stable in the through hole 111 and are less prone to shaking. After the assembly is completed, the step surfaces of the two limit steps 12 of the lead-out pin 30 are respectively abutted against the upper surface of the base 2, so that the lead-out pin 30 is limited to move downwards; because the elastic clamping piece 10 cannot move upwards under the limit of the sinking groove 112, and the elastic clamping piece 10 is connected with the leading-out pin 30 in a buckling way, the elastic clamping piece 10 forms an upper limit to the leading-out pin 30, so that the leading-out pin 30 cannot move upwards. In addition, the elastic clamping piece 10 provides elastic support for the leading-out pin 30, so that the leading-out pin 30 supports the inner side surface of the jack 11, and the leading-out pin 30 cannot displace in the through hole 111 along the width direction and the thickness direction, therefore, the leading-out pin 30 can be firmly limited in the jack 11, and the plugging force of the leading-out pin 30 is greatly improved.

According to the electromagnetic relay for preventing contact adhesion, a chipless plug-in mode of the leading-out pin is realized, and dispensing and fixing are not needed, so that the risk that plastic scraps increase the non-conduction of a product can be avoided, and the problem that the plug-in force of the leading-out pin is seriously reduced after glue is softened at high temperature during glue fixing can be avoided.

The above embodiments are only used to further illustrate the electromagnetic relay for preventing contact adhesion of the present invention, but the present invention is not limited to the embodiments, and any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims (12)

1. An electromagnetic relay for preventing contact adhesion comprises a base, a magnetic circuit part and a contact part, wherein the magnetic circuit part is arranged on the base; the contact portion includes a push card and at least one contact unit, characterized in that: the contact unit comprises at least one rigid movable reed provided with a movable contact and at least one static spring part arranged on the base, wherein the static spring part comprises a flexible static reed provided with a static contact and a limiting part; the limiting part is arranged on the base and/or the flexible static reed, and the limiting part limits the degree of deformation of the flexible static reed to the direction of the corresponding movable contact, so that the flexible static reed can meet the requirement of over-travel of the contact through the flexible characteristic and can prevent the static contact and the movable contact from being adhered.

2. The contact-sticking-preventing electromagnetic relay according to claim 1, characterized in that: the limiting piece is a static spring leading-out piece of the static spring part and is electrically connected with the flexible static spring piece.

3. The contact-sticking preventing electromagnetic relay according to claim 1 or 2, characterized in that: the limiting part is matched with one side, facing the corresponding movable contact, of the flexible static reed, and abuts against the flexible static reed, and the matching point of the limiting part and the flexible static reed is located below the static contact.

4. The electromagnetic relay according to claim 3, characterized in that: the top of the limiting part is provided with a bending section, the upper end of the bending section props against the flexible static reed, and the rest part of the bending section has a distance with the flexible static reed.

5. The electromagnetic relay according to claim 1, characterized in that: the rigid movable spring comprises a main piece and a plurality of supporting pieces which are integrally formed, the main piece is fixed on the pushing card, the plurality of supporting pieces are arranged at intervals along the moving direction of the pushing card, each supporting piece extends downwards and is provided with the movable contact, and each movable contact on the rigid movable spring faces to the same side of the pushing card in the moving direction; each support is respectively matched with one flexible static reed and a static contact on the flexible static reed, so that the rigid dynamic reed and the flexible static reed matched with the rigid dynamic reed form a plurality of contact pairs in a serial connection mode.

6. The electromagnetic relay of claim 5, characterized in that: the number of the supporting pieces is two, so that the rigid movable spring leaf is in an inverted U shape.

7. The electromagnetic relay according to claim 1, 2, 5 or 6, characterized in that: the contact unit comprises a plurality of rigid movable reeds and a plurality of static spring parts, the rigid movable reeds are arranged at intervals along the movement direction of the push card, a part of rigid movable reeds and flexible static reeds matched with the rigid movable reeds form a normally open contact pair, and the other rigid movable reeds and flexible static reeds matched with the rigid movable reeds form a normally closed contact pair.

8. The contact-sticking preventing electromagnetic relay according to claim 7, characterized in that: two adjacent flexible static reeds in the moving direction of the push card share the same limiting piece; the limiting piece shared by two adjacent flexible static reeds is Y-shaped.

9. The contact-sticking-preventing electromagnetic relay according to claim 1, 2, 5, or 6, characterized in that: the contact units are arranged in groups at intervals along the direction vertical to the moving direction of the push card; the base is provided with an arc barrier which separates adjacent contact units; the arc barrier and the base are integrally formed, or the arc barrier and the base are separated from each other, and the arc barrier is arranged on the base.

10. The contact-sticking-preventing electromagnetic relay according to claim 1, 2, 5, or 6, characterized in that: one or more elastic pieces are abutted between the pushing card and the base or the magnetic circuit part, and the elastic pieces provide counter force opposite to the attraction direction of the armature iron for the pushing card; the position of the elastic piece matched with the pushing card is equivalent to the horizontal position of the movable contact in contact with the fixed contact; the elastic piece is a spring.

11. The contact-sticking-preventing electromagnetic relay according to claim 1, 2, 5, or 6, characterized in that: the magnetic circuit part comprises a coil component and the armature, the coil component is horizontal, the armature is arranged on one side of the coil component in the axial direction in a swinging mode, and the bottom of the armature is fixed with the push card; the coil component is provided with a limiting frame, and the bottom of the limiting frame is matched with the pushing card and/or the armature so as to limit the stroke of the armature moving towards the direction far away from the coil component.

12. The contact-stick-preventing electromagnetic relay according to claim 11, characterized in that: the limiting frame is in an inverted U shape, two sides of the limiting frame are respectively matched with two sides of the armature in the width direction, and the bottoms of two sides of the limiting frame are respectively matched with the pushing clamp.

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