CN212182232U

CN212182232U - DC relay capable of bearing large current impact after contact abrasion

Info

Publication number: CN212182232U
Application number: CN202021317476.5U
Authority: CN
Inventors: 戴丁志; 李思进; 马海洋
Original assignee: Neptune Electric Kunshan Co ltd
Current assignee: Neptune Electric Kunshan Co ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2020-12-18
Anticipated expiration: 2030-07-08

Abstract

The utility model discloses a contact still can bear direct current relay that heavy current strikeed after wearing and tearing, draw forth end, straight type movable contact spring and pushing mechanism including two stationary contacts, pushing mechanism includes push rod, pressure spring, spring fixing base, promotes support, goes up yoke, locating part, moves yoke and lower yoke, and straight type movable contact spring transversely passes and promotes the support, and lower yoke is fixed on the downside of straight type movable contact spring. The upper yoke is fixed on the top end of the pushing support, the movable yoke is located between the straight movable spring and the upper yoke, a limiting hole with the radius larger than that of the limiting part is arranged on the upper yoke, a clamping edge is arranged at the upper end part of the limiting part, the lower end of the limiting part movably penetrates through the limiting hole to be fixedly connected with the movable yoke, and the clamping edge of the limiting part is stopped outside the limiting hole of the upper yoke. The utility model discloses still can bear the heavy current after the contact wearing and tearing, not only increased the electromagnetic attraction who is used for resisting electronic repulsion, work certain number of times moreover after the contact wearing and tearing, it bears heavy current impact capacity and can strengthen on the contrary.

Description

DC relay capable of bearing large current impact after contact abrasion

Technical Field

The utility model relates to a relay technical field, specific saying so relates to a direct current relay that can still bear heavy current after contact wearing and tearing.

Background

At present, a direct current relay easily generates electric repulsion force when large impact current occurs, so that a static contact and a movable reed are forced to be separated under the action of the repulsion force, the static contact and the movable reed are attracted again under the action of a pressure spring after the static contact and the movable reed are separated instantly, high-temperature electric arc is continuously generated at the contact position of the static contact and the movable reed between the separation and the attraction, the contact position of the static contact and the movable reed is heated instantly and is adhered easily, and the relay is forced to lose efficacy due to the adhesion of the contacts.

The large current flowing in the carrier circuit is a relatively troublesome problem at present. The key to solving the problem of forced separation of such contacts is how to resist or cancel the electrodynamic repulsion force generated by the high current impact. In the prior art, a closed magnetic conductive ring composed of a movable yoke and a lower yoke is additionally arranged at a movable reed, when current flowing through the movable reed changes, an annular magnetic field is generated at the periphery of the movable reed and acts between the movable yoke and the lower yoke, at the moment, the movable yoke and the lower yoke respectively generate electromagnetic attraction to attract each other, and meanwhile, the movable yoke and a pushing mechanism are fixed to achieve the purpose that the electromagnetic attraction is upward along the axial direction of a contact, so that the purpose that a relay continues to normally work and does not fail is achieved by resisting electric repulsion force generated by large-current impact. The larger the impact current is, the stronger the magnetic field acting in the closed magnetic loop formed by the moving yoke and the lower yoke is, and at this time, the larger the electromagnetic attraction force is generated between the moving yoke and the lower yoke due to the instant increase of the magnetic field intensity. The structure capable of bearing large current impact realizes that the electromagnetic attraction force is upward along the direction of the contact axis because the upper yoke is fixed on the U-shaped push bracket on the push rod. After the contact of the relay is contacted with the straight movable reed, because a gap still exists between the movable iron core and the static iron core which provide thrust and needs to be removed, the pushing mechanism continues to drive the upper yoke iron to move upwards, so that a gap is generated between the movable yoke iron and the lower yoke iron, the electromagnetic suction is reduced, and the energy efficiency of the relay for bearing large-current impact is influenced.

On the other hand, when the relay works for a period of time, the lower end contact of the leading-out end of the static contact and the upper end contact of the straight movable reed are repeatedly attracted and separated to be abraded to a certain extent, and the abrasion degree is increased along with the increase of the working on-off times of the relay, so that the gap between the movable yoke and the lower yoke is increased under the influence of abrasion during the attraction of the relay, the electromagnetic attraction is reduced, and the capacity of the relay for bearing large-current impact is weakened.

Disclosure of Invention

In order to overcome the defects, the utility model provides a direct current relay that still can bear heavy current after the contact wearing and tearing, not only increased the electromagnetic attraction who is used for resisting electronic repulsion, under the contact wearing and tearing condition after the certain number of times of relay work moreover, the heavy current impact capacity that bears of relay still is not influenced on the contrary bearing capacity can strengthen.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: a direct current relay capable of bearing large current impact after contacts are abraded comprises two stationary contact leading-out ends, a straight movable reed arranged below the two stationary contact leading-out ends and a pushing mechanism used for driving the straight movable reed to move up and down so as to enable the straight movable reed to be in contact with and separated from the two stationary contact leading-out ends, wherein the pushing mechanism comprises a push rod and a pushing support, the bottom of the pushing support is fixedly connected with the upper end part of the push rod, an upper yoke is fixed at the top of the pushing support, and the upper yoke is located between the two stationary contact leading-out ends; the straight movable spring plate transversely penetrates through the pushing support, and a lower yoke is fixed on the lower side surface of the straight movable spring plate; the spring fixing seat is fixed at the bottom of the pushing support, a pressure spring is arranged on the spring fixing seat, the upper end of the pressure spring is elastically abutted against the lower yoke, a movable yoke is arranged between the straight movable spring leaf and the upper yoke, a limiting part with a clamping edge at the upper end is additionally arranged, a first limiting hole with the radius larger than that of the limiting part except the clamping edge is arranged on the upper yoke, the lower end of the limiting part movably penetrates through the first limiting hole and is fixedly connected with the movable yoke, and the clamping edge of the limiting part is stopped outside the first limiting hole of the upper yoke.

As a further improvement of the present invention, the lower end of the limiting member is riveted to the movable yoke, and when the stationary contact leading-out end and the straight movable spring leaf remain stationary and do not contact, the movable yoke reaches the distance of the clamping edge of the limiting member is greater than the distance of the upper side of the upper yoke.

As a further improvement of the present invention, the first limit hole is located at the center of the upper yoke and is collinear with the axis of the push rod.

As a further improvement, be equipped with two stoppers on the downside of straight type movable reed, it is equipped with the spacing hole of two seconds, two to correspond on the lower yoke the stopper blocks respectively and arranges in two spacing downtheholess of second.

As a further improvement, the utility model discloses a two the spacing hole of second is relative the axis symmetry of push rod sets up, two the stopper highly be greater than the thickness of yoke down, two the end of stopper stretches out promptly the part card of yoke is gone into down in pressure spring's the upper end.

As a further improvement of the present invention, the movable yoke is in a straight shape, and the lower yoke is in a U shape; the pushing support is a U-shaped support made of weak magnetic conducting or non-magnetic conducting materials, and the tops of the U-shaped support are bent outwards respectively.

As a further improvement, be equipped with spacing installation boss on the downside of last yoke, the top correspondence that promotes the support is equipped with positioning hole, spacing installation boss card is arranged in the positioning hole.

As a further improvement, the pushing mechanism further comprises a stationary iron core and a movable iron core, the stationary iron core is located below the yoke plate, and the lower end of the push rod is movably passed through the yoke plate and the stationary iron core and then is fixedly connected with the movable iron core.

As a further improvement of the utility model, work as pushing mechanism drives straight type movable contact spring and two the stationary contact draws forth the rigid good touch in the twinkling of an eye of end, the movable iron core with still have the clearance between the stationary iron core, this clearance is the overstroke.

As a further improvement of the present invention, a yoke return tower-shaped spring is sleeved on a portion of the limiting member located between the upper yoke and the movable yoke.

The utility model has the advantages that:

1) the utility model is provided with an upper yoke fixed by a U-shaped pushing bracket, a movable yoke, a limiting part riveted with the movable yoke and relatively static, and a lower yoke contacted with the lower end surface of a straight movable spring leaf on the basis of the prior relay; the upper yoke iron is fixed on the connecting line of the two stationary contact leading-out ends and is positioned above the pushing mechanism, the movable yoke iron is riveted with the lower end surface of the limiting piece to keep a relatively fixed position and is fixed between the upper yoke iron and the straight movable reed, and the lower yoke iron is fixed on the lower end surface of the straight movable reed; the upper yoke, the movable yoke and the lower yoke are distributed in the width direction of the straight movable reed, when a contact at the lower end of a leading-out end of a static contact is closed with a contact at the upper end of the straight movable reed, the lower yoke moves upwards along the axis direction along with the pushing mechanism, platforms at two ends of the lower yoke are close to two ends of the movable yoke at the moment, but a gap is reserved between the movable iron core and the static iron core at the moment, the push rod continues to drive the U-shaped pushing support, the spring fixing seat, the upper yoke, the movable yoke and the limiting part to move upwards until the overtravel is completed, so that magnetic gaps at least with an overtravel distance exist between the platforms at two sides of the lower yoke and two ends of the movable yoke after the relay actuation action is completed completely, and the electromagnetic attraction force between the lower yoke and the movable yoke is greatly reduced. The utility model discloses this kind of structure can effectively make relay overtravel walk the back down yoke and move the yoke clearance and can guarantee to satisfy sufficient magnetic circuit requirement and leave sufficient surplus for the wearing and tearing in contact clearance again, effectively reduces the overtravel and walks the back to down yoke and move the influence of electromagnetic suction between the yoke. The structure of the utility model can generate electromagnetic attraction force in the direction of contact pressure when the movable spring leaf is impacted by large current, and is used for resisting the electric repulsion force generated between the lower end contact of the stationary contact leading-out end and the straight movable spring leaf due to the large current impact; the utility model discloses an this kind of new construction can effectively provide the ascending electromagnetic suction of contact pressure side, and this part electromagnetic suction is provided by the holding power of moving iron core and quiet iron core, because the holding power is far greater than electromagnetic suction and move iron core and quiet iron core holding power and remove still sufficient surplus for providing outside pushing mechanism thrust, can the effectual reaction force of supporting electromagnetic suction on contact pressure.

2) The utility model considers that after the movable reed and the stationary contact leading-out end in the relay are attracted and separated in a reciprocating way for a period of time on the basis of the prior relay, the movable reed and the stationary contact leading-out end of the relay are abraded to a certain degree, and the abrasion degree of the contact surface of the movable reed and the stationary contact leading-out end is intensified along with the increase of the working times of the relay, the utility model discloses a direct current relay which can still bear heavy current impact after the contact is abraded, in the relay, the movable reed and the stationary contact leading-out end are attracted, after the overtravel is finished, the platform at two sides of the lower yoke and the lower end surface of the movable yoke have certain abrasion gaps, so as to realize that the gaps between the lower end surface of the movable yoke and the platform at two sides of the lower yoke are reduced along with the abrasion along with the continuous abrasion of the movable reed and the stationary contact leading-out end in the use process, but the lower end surface of the movable yoke can not contact with the platform at two sides of the, the effect of bearing large current impact cannot be achieved.

Drawings

FIG. 1 is a perspective view of a partial structure of a preferred embodiment of the present invention;

fig. 2 is a schematic view of the upper yoke, the limiting member, the moving yoke, the lower yoke and the pushing mechanism according to the preferred embodiment of the present invention;

FIG. 3 is a top view of a partial configuration of a preferred embodiment of the present invention;

FIG. 4 is a front view of a partial configuration of a preferred embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is an exploded perspective view of a partial structure of the preferred embodiment of the present invention;

fig. 7 is a schematic structural view of an upper yoke according to a preferred embodiment of the present invention;

FIG. 8 is a schematic view of the push rod, the U-shaped push bracket and the spring fixing seat of the preferred embodiment of the present invention;

fig. 9 is a schematic view of the construction of the lower yoke according to the preferred embodiment of the present invention;

FIG. 10 is a schematic view of the stop member and the movable yoke in rivet connection according to the preferred embodiment of the present invention;

fig. 11 is a schematic structural diagram of another embodiment of the present invention;

fig. 12 is a partially enlarged schematic view of fig. 11.

The following description is made with reference to the accompanying drawings:

1-stationary contact leading-out terminal; 2-straight movable reed;

3-pressure spring; 4-yoke iron plate;

5-spring fixing seat; 6-push the support;

7-upper yoke; 8-a limiting part;

9-moving yoke iron; 10-lower yoke;

11-push rod; 12-static iron core;

13-movable iron core; 81-clamping edge;

71-first limiting hole; and 14, returning the yoke to the tower-shaped spring.

Detailed Description

The following description of the preferred embodiments of the present invention will be made in conjunction with the accompanying drawings.

Referring to fig. 1-10, for a direct current relay that can still bear heavy current impact after contact wearing and tearing, draw forth end 1, set up at two stationary contacts and draw forth the straight type movable contact spring 2 of end 1 below to and be used for driving straight type movable contact spring 2 and can up-and-down motion so that its and two stationary contacts draw forth the pushing mechanism that end 1 contacted each other and separate.

The pushing mechanism comprises a movable iron core 13, a static iron core 12, a push rod 11, a pressure spring 3, a spring fixing seat 5, a U-shaped pushing support 6, an upper yoke 7, a limiting part 8, a movable yoke 9 and a lower yoke 10, wherein the straight movable reed 2 transversely penetrates through the U-shaped pushing support 6, and the lower yoke 10 is fixed on the lower side surface of the straight movable reed 2. The upper yoke 7 is fixed on the top end of the U-shaped pushing bracket 6 and is positioned between the two stationary contact leading-out terminals 1. The movable yoke 9 is located between the straight movable spring leaf 2 and the upper yoke 7, the upper yoke 7 is provided with a first limiting hole 71 with a radius larger than that of the limiting member 8, the upper end of the limiting member 8 is provided with a clamping edge 81, the lower end of the limiting member 8 movably penetrates through the first limiting hole 71 to be fixedly connected with the movable yoke 9, and the clamping edge 81 of the limiting member 8 is stopped outside the first limiting hole 71 of the upper yoke 7. Namely, the movable yoke 9 and the limiting piece 8 are mutually fixed and matched and are in clearance fit with the upper yoke, and certain movable clearances are arranged at the upper side and the lower side of the upper yoke 7.

The bottom of the pushing support 6 is fixedly connected with the upper end of the push rod 11, the lower portion of the push rod penetrates through the centers of the yoke iron plate 4 and the static iron core 12 and then is fixedly connected with the movable iron core 13, the spring fixing seat 5 is fixed at the bottom of the pushing support 6, the lower end of the pressure spring 3 is fixed on the spring fixing seat 5, and the upper end of the pressure spring is elastically abutted against the lower yoke iron 10 fixed on the lower side face of the straight movable reed 2.

This direct current relay is at the during operation, because straight type movable contact spring 2 is located pushing mechanism, straight type movable contact spring 2 transversely passes promotion support 6 promptly, when the movable iron core 13 circular telegram of bottom because magnetic force effect upward movement, drive push rod 11, promote support 6 and spring fixing base 5 and pressure spring 3 upward movement in the lump, pressure spring 3 upper end is owing to support tightly on fixing the lower yoke 10 on straight type movable contact spring 2's the downside, consequently will drive straight type movable contact spring 2 upward movement, in order to realize drawing out the contact closure of end 1 with two stationary contacts.

However, in the direct current relay, a movable yoke 9 is arranged between an upper yoke 7 and a straight movable reed 2, that is, the movable yoke 9 is connected with the upper yoke 7 through a limiting piece 8, when a lower end contact of two fixed contact leading-out ends 1 is closed with an upper end contact of the straight movable reed 2, the lower yoke 10 moves upwards along the axial direction along with a pushing mechanism, two ends of the lower yoke 10 are close to or contacted with the movable yoke 9, so that a group of closed magnetic loops are formed in the width direction of the straight movable reed 2, when a large impact current flows on the straight movable reed, that is, when a large current flows through the straight movable reed 2 through the fixed contact leading-out end 1 and flows along the other fixed contact leading-out end 1, a closed magnetic loop is formed between the movable yoke 9 and the lower yoke 10 along with the change of the current, at this time, an electromagnetic attraction force exists between the movable yoke 9 and the lower yoke 10, the electromagnetic attraction can offset part of electric repulsion generated by large current flowing through the lower end contact of the leading-out end of the static contact and the upper end contact of the straight movable reed.

When the actuation contact action of the lower end surface of the fixed contact leading-out end 1 of the direct current relay and the upper end surface of the straight movable reed 2 is completed, a gap still exists between the movable iron core 13 and the fixed iron core 12, the movable iron core 13 will continue to drive the push rod 11 to move upwards to continue to move over the overtravel, and at the moment, the push rod 11, the U-shaped pushing support 6, the upper yoke 7, the limiting part 8 and the movable yoke 9 continue to move upwards along the axial direction until the overtravel is completed until the movable iron core 13 and the fixed iron core 12 are completely actuated.

The lower end of the limiting member 8 is fixedly riveted and matched with the movable yoke 9, so that the lower end face of the limiting member 8 and the lower end face of the movable yoke 9 are located on the same plane and are mutually fixed, stored and static, the first limiting hole 71 is located at the central position of the upper yoke 7 and is collinear with the axis of the push rod, and the riveting combination structure of the limiting member 8 and the movable yoke 9 can generate relative sliding in the central through hole of the upper yoke 7, namely in the axis direction of the aperture of the first limiting hole 71.

Wherein, lower yoke is fixed on the downside of straight type movable reed 2, compression spring 3 is supported between yoke 10 and spring fixing base 5 up end under, for fixed Assembly, make down the yoke and do not produce the mistake between the straight type movable reed 2 and remove, be equipped with two stoppers on the downside of straight type movable reed 2, and correspond on the yoke down and be equipped with two spacing holes of second, two stoppers block respectively and arrange two spacing downthehole spacing cooperations of assembling in of second, and 2 end stopper height are greater than yoke thickness down under the straight type movable reed, make the partial card that stretches out yoke promptly of the end of two stoppers go into in compression spring 3's the upper end, fix a position compression spring 3 by being supported under yoke 10 terminal surface and spring fixing base 5 up end. The two second limiting holes are symmetrically arranged relative to the axis of the push rod, so that the up-and-down moving precision of the push rod is ensured.

Wherein, the moving yoke is straight shape, the lower yoke is U-shaped, so that the lower yoke 10 can contact or approach the moving yoke 9 through the platform at the two sides of the U-shaped to form a magnetic circuit.

The pushing support 6 is a U-shaped support made of weak magnetic conducting or non-magnetic conducting materials, magnetic loss in a closed magnetic loop is reduced, and the tops of the pushing support are bent outwards respectively so as to be convenient to fix the upper yoke iron 7. Specifically be for establish spacing installation boss on the downside of last yoke 7, the top correspondence that promotes support 6 is equipped with positioning hole, and spacing installation boss card is arranged in positioning hole, realizes the cooperation of the promotion support 6 roof of yoke 7 and U type.

The direct-current relay further comprises a yoke iron plate device, a through hole is formed in the center of the yoke iron plate, a U-shaped pushing support in the pushing mechanism and the spring fixing seat are formed in an injection molding mode, the pressure spring is abutted between the lower end face of the lower yoke iron and the upper end face of the spring, and a push rod of the pushing mechanism penetrates through the through hole of the yoke iron plate downwards to be connected and matched with a mechanism which provides pushing force and is arranged on the lower portion of the yoke iron plate for fixing.

Referring to fig. 11 and 12, in another embodiment of the present invention, a yoke return tower spring 14 is sleeved on a portion of the limiting member 8 between the upper yoke 7 and the movable yoke 9, and a gap between a lower end surface of the movable yoke and steps on both sides of the lower yoke is minimized by elasticity of the yoke return tower spring 14, so that electromagnetic attraction between the movable yoke 9 and the lower yoke 10 is maximized.

The working principle of the dc relay is explained in detail as follows:

when the direct-current relay does not work, and the lower end contact of the leading-out end of the static contact is not contacted with the upper end contact of the straight movable reed, the upper yoke, the limiting piece, the movable yoke, the straight movable reed, the lower yoke, the pressure spring and the spring fixing seat which are assembled on the pushing mechanism are driven upwards along the axial direction by the force provided by the iron core along with the pushing mechanism. At the moment, when a large current flows through the straight movable spring piece through the fixed contact leading-out end and flows away along the other fixed contact leading-out end, a closed magnetic loop is formed between the movable yoke and the lower yoke along with the change of the current, and at the moment, electromagnetic attraction exists between the movable yoke and the lower yoke.

When the contact at the lower end of the leading-out end of the static contact of the relay is in attraction contact with the contact at the upper end of the straight movable reed, a gap still exists between the movable iron core and the static iron core, the movable iron core continues to drive the push rod to move upwards to continue to move over the overtravel, and at the moment, the push rod, the U-shaped pushing support, the upper yoke, the limiting piece and the movable yoke continue to move upwards along the axis direction until the overtravel moves over the movable iron core and the static iron core to be completely attracted. Meanwhile, a closed magnetic loop is formed between the movable yoke and the lower yoke, so that the movable yoke and the lower yoke are mutually attracted by electromagnetic attraction, and the lower end surface of the movable yoke and the lower end surface of the limiting piece are positioned on the same plane, and is riveted, matched and kept relatively fixed, and the holding force of the driven iron core and the static iron core is supported by the U-shaped pushing support, so that the limiting piece is contacted with the upper end surface of the upper yoke iron and moves upwards along the axis along with the U-shaped pushing support, the clearance between the limiting piece and the moving yoke is controlled by referring to the overtravel clearance to realize the clearance between the moving yoke and the lower yoke, thereby not only ensuring to meet the requirement of a sufficient magnetic circuit but also avoiding the electromagnetic attraction force from being greatly reduced due to the overtravel, this realizes that the movable yoke is subjected to the holding force provided by the movable iron core and the static iron core along the axial direction along with the upper yoke and is simultaneously subjected to the electromagnetic attraction force downward along the axial direction from the lower yoke. Because move the yoke and rivet with the locating part, the locating part is by the spacing unable removal of upper yoke up end, realizes down the yoke and to moving the yoke originally along the ascending electromagnetic attraction of axis to moving the yoke along the ascending electromagnetic attraction of axis.

Therefore, the direct current relay utilizes the fact that the holding force between the movable iron core and the fixed iron core is far larger than the electromagnetic attraction force between the movable yoke and the lower yoke to achieve the effect that when a large current flows through the fixed contact leading-out end and flows through the straight movable spring piece in the relay, the electromagnetic attraction force is generated by the current change to effectively resist the repulsion force caused by the current change, and the contact pressure between the lower end contact of the fixed contact leading-out end and the upper end contact of the straight movable spring piece is increased.

This direct current relay still realizes through control design movable yoke and locating part thickness size the impact that the relay can bear the heavy current, has slight clearance between lower yoke both sides platform up end and movable yoke lower extreme terminal surface after movable iron core and quiet iron core overtravel have walked, this work is in order to guarantee when the relay life after certain, and the stationary contact draws forth end lower extreme contact and straight type movable reed upper end contact to have certain wearing and tearing back, and the relay is middle and straight type movable reed upper end contact can diminish with movable yoke lower extreme terminal surface because the wearing and tearing clearance can diminish, realizes that the relay still has the ability of bearing the heavy current impact.

In summary, 1) the dc relay is provided with an upper yoke fixed by a U-shaped pushing bracket, a movable yoke, a limiting member riveted with the movable yoke and relatively stationary, and a lower yoke contacted with the lower end surface of a straight movable spring, on the basis of the existing relay; the upper yoke iron is fixed on the connecting line of the two stationary contact leading-out ends and is positioned above the pushing mechanism, the movable yoke iron is riveted with the lower end surface of the limiting piece to keep a relatively fixed position and is fixed between the upper yoke iron and the straight movable reed, and the lower yoke iron is fixed on the lower end surface of the straight movable reed; the upper yoke, the movable yoke and the lower yoke are distributed in the width direction of the straight movable reed, when a contact at the lower end of a leading-out end of a static contact is closed with a contact at the upper end of the straight movable reed, the lower yoke moves upwards along the axis direction along with the pushing mechanism, platforms at two ends of the lower yoke are close to two ends of the movable yoke at the moment, but a gap is reserved between the movable iron core and the static iron core at the moment, the push rod continues to drive the U-shaped pushing support, the spring fixing seat, the upper yoke, the movable yoke and the limiting part to move upwards until the overtravel is completed, so that magnetic gaps at least with an overtravel distance exist between the platforms at two sides of the lower yoke and two ends of the movable yoke after the relay actuation action is completed completely, and the electromagnetic attraction force between the lower yoke and the movable yoke is greatly reduced. The utility model discloses this kind of structure can effectively make relay overtravel walk the back down yoke and move the yoke clearance and can guarantee to satisfy sufficient magnetic circuit requirement and leave sufficient surplus for the wearing and tearing in contact clearance again, effectively reduces the overtravel and walks the back to down yoke and move the influence of electromagnetic suction between the yoke. The structure of the utility model can generate electromagnetic attraction force in the direction of contact pressure when the movable spring leaf is impacted by large current, and is used for resisting the electric repulsion force generated between the lower end contact of the stationary contact leading-out end and the straight movable spring leaf due to the large current impact; the utility model discloses an this kind of new construction can effectively provide the ascending electromagnetic suction of contact pressure side, and this part electromagnetic suction is provided by the holding power of moving iron core and quiet iron core, because the holding power is far greater than electromagnetic suction and move iron core and quiet iron core holding power and remove still sufficient surplus for providing outside pushing mechanism thrust, can the effectual reaction force of supporting electromagnetic suction on contact pressure.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims

1. A direct current relay capable of bearing large current impact after contact abrasion comprises two stationary contact leading-out ends (1), a straight movable spring piece (2) arranged below the two stationary contact leading-out ends (1), and a pushing mechanism used for driving the straight movable spring piece (2) to move up and down to enable the straight movable spring piece to be in contact with and separated from the two stationary contact leading-out ends (1), wherein the pushing mechanism comprises a push rod (11) and a pushing support (6), the bottom of the pushing support (6) is fixedly connected with the upper end part of the push rod (11), an upper yoke (7) is fixed to the top of the pushing support (6), and the upper yoke (7) is located between the two stationary contact leading-out ends (1); the straight movable spring (2) transversely penetrates through the pushing support (6), and a lower yoke (10) is fixed on the lower side surface of the straight movable spring (2); promote the bottom of support (6) and be fixed with spring fixing base (5), be equipped with pressure spring (3) on this spring fixing base (5), this pressure spring's upper end elasticity supports tightly under on yoke (10), its characterized in that: a movable yoke (9) is arranged between the straight movable spring piece (2) and the upper yoke (7), a limiting piece (8) with a clamping edge (81) at the upper end is further arranged, a first limiting hole (71) with the radius larger than the outer part of the clamping edge of the limiting piece is arranged on the upper yoke (7), the lower end of the limiting piece (8) movably penetrates through the first limiting hole (71) and is fixedly connected with the movable yoke (9), and the clamping edge (81) of the limiting piece (8) is stopped outside the first limiting hole (71) of the upper yoke (7).

2. The direct current relay according to claim 1, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: the lower end of the limiting piece (8) is fixedly riveted with the movable yoke (9), and when the fixed contact leading-out end (1) and the straight movable reed (2) are kept static and are not contacted, the distance from the movable yoke to a clamping edge (81) of the limiting piece is larger than the distance from the movable yoke to the upper side face of the upper yoke.

3. The direct current relay according to claim 2, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: the first limiting hole (71) is located in the center of the upper yoke (7) and is collinear with the axis of the push rod.

4. The direct current relay according to claim 1, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: two limiting blocks are arranged on the lower side face of the straight movable reed (2), two second limiting holes are correspondingly formed in the lower yoke, and the limiting blocks are respectively clamped in the two second limiting holes.

5. The direct current relay according to claim 4, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: the two limiting holes are arranged symmetrically relative to the axis of the push rod, the height of the limiting blocks is larger than the thickness of the lower yoke, and the tail ends of the limiting blocks extend out of the lower yoke, and the part of the tail ends of the limiting blocks is clamped into the upper end of the pressure spring (3).

6. The direct current relay according to claim 1, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: the movable yoke iron is in a straight shape, and the lower yoke iron is in a U-shaped shape; the pushing support (6) is a U-shaped support made of weak magnetic conducting or non-magnetic conducting materials, and the tops of the U-shaped support are bent outwards respectively.

7. The direct current relay according to claim 6, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: the lower side surface of the upper yoke is provided with a limiting installation boss, the top of the pushing support (6) is correspondingly provided with a positioning through hole, and the limiting installation boss is clamped in the positioning through hole.

8. The direct current relay according to claim 1, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: the pushing mechanism further comprises a static iron core (12) and a movable iron core (13) which are located below the yoke iron plate (4), and the lower end of the push rod penetrates through the yoke iron plate (4) and the static iron core (12) in a movable mode and then is fixedly connected with the movable iron core (13).

9. The direct current relay according to claim 8, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: when the pushing mechanism drives the straight movable spring (2) to be in contact with the two stationary contact leading-out ends (1) just right, a gap is formed between the movable iron core and the stationary iron core, and the gap is over-travel.

10. The direct current relay according to claim 1, wherein the direct current relay is capable of bearing a large current surge after the contact is worn, and the direct current relay comprises: a yoke return tower-shaped spring (14) is sleeved outside the part, located between the upper yoke (7) and the movable yoke (9), of the limiting piece (8).