CN113223904A - Electromagnetic release and electrical protection device comprising same - Google Patents

Abstract

The invention discloses an electromagnetic trip and electrical protection equipment comprising the same, and relates to the technical field of electromagnetic trip devices. The electromagnetic release provided by the invention comprises a U-shaped magnetic yoke, an armature, a permanent magnet, a reset spring and an air gap maintaining device, wherein the air gap maintaining device is used for enabling an air gap between the permanent magnet and the armature to be a constant preset value when two polar surfaces of the armature end and the magnetic yoke end are attached, and the air gap between the permanent magnet and the armature is kept constant at a preset air gap value when the armature is attached to the polar surfaces of two branches of the magnetic yoke through the air gap maintaining device, so that the attraction of the magnet to the armature is constant, the electromagnetic release works reliably and stably, the balance torque of the reset spring and the magnet is conveniently and accurately designed, the torque balance of a reset elastic piece and the permanent magnet can be destroyed by adopting smaller current, the scheme of the low-power electromagnetic release is possible, and the electromagnetic release is suitable for the use working conditions of low power consumption and low current.

Description

Electromagnetic release and electrical protection device comprising same

Technical Field

The invention relates to the technical field of electromagnetic tripping devices, in particular to an electromagnetic release and electrical protection equipment comprising the same.

Background

An electromagnetic release is one of releases and is mainly used for short-circuit protection of circuits.

In the prior art, chinese patent No. CN1763884B discloses an electromagnetic trip device and an electrical protection apparatus including the same, the electromagnetic trip device includes a U-shaped armature, a trip coil, a paddle, a spring of the paddle, and a return pin of the paddle, the paddle pivots relative to the armature and can move to the polar surfaces at the two ends of the armature to close a magnetic circuit formed by the armature and the paddle, the trip coil is installed around a casing surrounding the circuit; when the magnetic field generator is in a standing state, no current flows in the coil, and the blade is kept to lean against the armature by magnetic flux generated by the magnet; when a current is present in the coil, the leaf opens when this current has reached a certain magnitude predetermined by the balance between the torque of the spring and the magnetic torque produced by the magnetic flux generated by the magnet.

Because assembly errors inevitably exist in the assembly process, when the electromagnetic tripping device is actually used, the gap between the blade plate and the magnet has errors with the designed gap; in addition, after tripping, the blade plate is pushed and reset through the reset pin shaft, and when the reset thrust applied to the blade plate by the reset pin shaft is too large or after resetting for many times, the blade plate can deform and warp, so that the gap between the blade plate and the magnet is changed.

In summary, in the electromagnetic trip device in the prior art, the gap between the paddle and the magnet is not controllable, so that the attraction force of the magnet to the paddle is not constant, and the electromagnetic trip device may or may not trip when the same current is applied to the coil, which causes the problem that the operation of the electromagnetic trip device is unstable, and thus the use of the electromagnetic trip device is seriously affected.

Therefore, there is a need to provide a new electromagnetic trip solution.

Disclosure of Invention

In order to overcome at least one of the above drawbacks of the prior art, a first object of the present invention is to provide an electromagnetic release, which is used to solve the problem of unstable use of the conventional electromagnetic release, and can be applied to a low-current and low-power operating condition.

The technical scheme adopted by the invention for solving the problems is as follows:

an electromagnetic release comprising:

a U-shaped yoke, both branches of the yoke having polar surfaces;

the armature is movably arranged relative to the magnetic yoke and can be attached to the two polar surfaces of the magnetic yoke to form a closed magnetic loop;

the permanent magnet provides magnetic force for keeping the armature and the two polar surfaces of the magnetic yoke in a state of being attached to each other;

the return spring is connected with the armature and provides elastic force for the armature to separate from the two polar surfaces of the magnetic yoke;

and the air gap maintaining device is used for enabling the air gap between the permanent magnet and the armature to be a constant preset value when the armature is attached to the two polar surfaces at the end of the magnetic yoke.

The electromagnetic release provided by the invention comprises an air gap retaining device, when the armature iron is attached to the polar surfaces of the two branches of the magnetic yoke, the air gap retaining device enables the air gap between the permanent magnet and the armature iron to be kept constant at a preset air gap value, so that the permanent magnet can provide constant magnetic force for the armature iron, the influences of assembly gap and armature iron deformation are avoided, the operation of the electromagnetic release is reliable and stable, and the reset elastic force of the reset spring can be accurately set and designed due to the constant magnetic force of the permanent magnet, so that the moment balance of the reset elastic piece and the permanent magnet can be destroyed by adopting smaller current, and the electromagnetic release is suitable for working conditions of small current and low power consumption.

Further, the air gap maintaining device is a partition plate which is not magnetically conductive, and the partition plate is arranged between the armature and the permanent magnet.

Further, the spacer is fixed to at least one of the armature and the permanent magnet.

Further, the permanent magnet is movably arranged in a preset range relative to the magnetic yoke, and the moving direction of the permanent magnet is parallel to the direction of the magnetic force applied to the armature by the permanent magnet for keeping the armature attached to the two polar surfaces.

Further, the armature is rotatably connected to one of the branches of the yoke and the armature is movably disposed with respect to the yoke in a direction parallel to a normal line of the polar surface.

Furthermore, a magnetic conductive connecting plate is fixedly arranged on the permanent magnet, and the connecting plate is attached to the side face of the branch of the rotary connection between the magnet yoke and the armature and can slide along the side face of the branch.

Furthermore, a non-magnetic-conductive support is fixedly arranged on a branch of the magnetic yoke, the armature is rotatably connected with the support, a rotating shaft of the armature rotating around the support is slidably connected with the support, and the rotating shaft slides relative to the support along a normal direction parallel to the polar surface.

Furthermore, the armature is provided with a rotating support surface which is attached to the surface of the support and can slide along the surface of the support, and the armature can rotate relative to the support around the rotating support surface.

Furthermore, a non-magnetic connecting piece is fixed on the armature, and the rotating supporting surface is arranged on the connecting piece.

Further, an angle limiting structure is arranged between the support and the armature and can be attached to the surface of at least one of the support and the armature so as to limit the rotation angle of the armature relative to the magnetic yoke.

Further, the angle limiting structure is an inclined abutting surface arranged on one side of the rotating support surface, and the inclined abutting surface can be abutted with the surface of the support to limit the rotating angle of the armature relative to the magnetic yoke.

Furthermore, the electromagnetic release also comprises a reset column (9), wherein the reset column (9) is connected with the armature (202) and is used for driving the armature (202) to move so as to be attached to the two polar surfaces (20111) to reset.

Furthermore, a buffering elastic sheet is arranged on the armature, and the reset column is abutted to the buffering elastic sheet.

Further, the yoke is provided with an excitation coil.

Further, the magnetic yoke comprises a connecting part connected with the two branches, and the excitation coil is arranged on the connecting part.

Further, the electromagnetic release also includes a housing.

Further, the housing includes a case having a lateral opening and a cover detachably connected to the case.

Based on the same inventive concept, a second object of the present invention is to provide an electrical protection device comprising an electromagnetic trip as described above.

In summary, the electromagnetic release and the electrical protection device including the electromagnetic release provided by the invention have the following technical effects:

1) by arranging the air gap maintaining device, when the armature is attached to the polar surfaces of the two branches of the magnetic yoke, the air gap between the permanent magnet and the armature is kept constant at a preset air gap value, and the gap between the armature and the magnet is controllable, so that the attraction of the magnet to the armature is constant, the work of the electromagnetic trip is reliable and stable, the balance torque of the reset spring and the magnet is conveniently and accurately designed, the torque balance of the reset elastic piece and the permanent magnet can be destroyed by adopting smaller current, the scheme of the low-power electromagnetic trip is possible to realize, and the low-power electromagnetic trip is suitable for the use working conditions of low power consumption and low current.

2) The non-magnetic-conductive partition plate is used as an air gap retaining device, so that the structure is simple, and the structural design and the processing production are easy;

3) the permanent magnet is arranged to be movable within a preset range, so that when the armature is attached to the polar surfaces of the two branches of the magnetic yoke, the permanent magnet can move relative to the magnetic yoke within a certain range, the permanent magnet is enabled to be attached to the armature through the partition plate, the situation that the armature cannot be kept at a constant preset air gap with the permanent magnet due to deformation or other reasons is avoided, and the use stability of the electromagnetic release is further improved;

4) the permanent magnet is connected with the magnetic yoke through a connecting plate, so that on one hand, the fixing structure of the permanent magnet can be simplified, and on the other hand, as the connecting plate is connected with the branch of the magnetic yoke close to one side of the armature rotating shaft, the force arm of the permanent magnet can be reduced, the locking moment of the permanent magnet on the armature can be reduced, and further, the magnetic yoke is excited by small current to offset partial magnetic flux of the permanent magnet, so that the tripping action can be realized;

5) the armature is rotatably connected with one branch of the magnetic yoke, when tripping is performed, the armature swings relative to the magnetic yoke, tripping is rapid, and the armature is arranged to be movable relative to the magnetic yoke along the normal direction parallel to the polar surface, so that the armature is more tightly attached to the polar surface, the magnetic leakage between the armature and the magnetic yoke is reduced, the use stability of the electromagnetic release is further improved, and the realization of the electromagnetic release working with low power consumption and low current becomes possible;

6) the armature is connected with the support through a non-magnetic connecting piece, so that the production and the processing are convenient.

7) The inclined abutting surface arranged on one side of the rotary support of the connecting piece can play a role in limiting the rotation angle of the armature, and the connecting piece is ingenious in structure and easy to process.

Drawings

FIG. 1 is an exploded view of an electromagnetic release in accordance with an embodiment of the present invention;

fig. 2 is a schematic diagram of an internal structure of an electromagnetic release in a triggered trip state according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an internal structure of an electromagnetic release in an un-triggered trip state according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the structure of the field coil, the yoke and the support of the electromagnetic release according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a buffering elastic sheet and a connecting member according to an embodiment of the present invention;

fig. 6 is a schematic diagram of an internal structure of the box according to an embodiment of the present invention.

Wherein the reference numerals have the following meanings:

1. a housing; 101. a box body; 1011. clamping; 1012. a through groove; 1013. buckling the salient points; 102. a cover plate; 1021. a buckling part; 2. a trip assembly; 201. a magnetic yoke; 2011. branching; 20111. a polar surface; 20112. clamping the bulges; 20113. a plug end; 2012. a connecting portion; 202. an armature; 203. a permanent magnet; 204. a return spring; 205. a field coil; 206. a partition plate; 3. a groove; 4. a guide plate; 5. a support; 501. connecting holes; 502. a second spring hook; 6. a connecting member; 601. rotating the support surface; 602. an inclined abutting surface; 7. a connecting plate; 8. a first spring hook; 9. a reset column; 901. a limiting table; 10. a buffering elastic sheet; 1001. a fixed end; 1002. a movable end; 1003. an arching portion; 11. connecting the bosses; 1101. a reset hole.

Detailed Description

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

Referring to fig. 1 to 6, the invention discloses an electromagnetic release, which comprises a housing 1 and a release assembly 2 arranged in the housing 1, wherein the release assembly 2 comprises a U-shaped magnetic yoke 201, an armature 202, a permanent magnet 203, a return spring 204 and an excitation coil 205, the magnetic yoke 201 is provided with two branches 2011 arranged in parallel and a connecting part 2012 connected between the two branches 2011, both branches 2011 of the magnetic yoke 201 are provided with polar surfaces 20111, and the excitation coil 205 is arranged on the magnetic yoke 201;

the armature 202 is movably arranged relative to the magnetic yoke 201 and can be attached to the two polar surfaces 20111 to form a closed magnetic loop;

the return spring 204 is connected to the armature 202, and referring to fig. 2, provides an elastic force for the armature 202 to disengage from the two polar surfaces 20111 when the electromagnetic release is in a tripped state;

referring to fig. 3, when the electromagnetic release is in an unfired release state, the permanent magnet 203 provides magnetic force to the armature 202 to keep the armature in contact with the two polar surfaces 20111.

Referring to fig. 1-3, the trip assembly 2 further includes an air gap maintaining device for maintaining a constant predetermined value of the air gap between the permanent magnet 203 and the armature 202 when the armature 202 is attached to the two polar surfaces 20111.

The preset air gap value is designed according to the actual application requirement of the electromagnetic release.

In a preferred embodiment, the air gap maintaining means is a non-magnetically permeable spacer 206, the spacer 206 being arranged between the armature 202 and the permanent magnet 203; the armature 202 is separated from the permanent magnet 203 by a spacer 206 so that the air gap between the armature 202 and the permanent magnet 203 is maintained at a constant value.

In other possible embodiments, the air gap maintaining device may also be an air cushion, a non-magnetic ball or a column disposed between the air gap maintaining devices, as long as the air gap between the permanent magnet 203 and the armature 202 can be maintained at a constant preset value when the armature 202 is attached to the two polar surfaces 20111.

Further, the spacer 206 is fixed to at least one of the armature 202 and the permanent magnet 203.

Further, as a preferred embodiment, in the present embodiment, the partition plate 206 is fixed on a side of the armature 202 facing the permanent magnet 203, and a surface of the partition plate 206 facing away from the armature 202 may be attached to a surface of the permanent magnet 203, so that an air gap between the permanent magnet 203 and the armature 202 is maintained at a constant preset value.

Further, the spacer 206 may be configured to be welded to the surface of the armature 202, or may be embedded in the armature 202 such that its surface protrudes from the surface of the armature 202; the spacer 206 may also be secured to the armature 202 in other ways known in the art.

In other possible embodiments, the spacer 206 may be fixed to the permanent magnet 203 and extend towards one side of the armature 202 such that the spacer 206 may abut a surface of the armature 202, thereby maintaining the air gap between the permanent magnet 203 and the armature 202 at a constant preset value.

Further, the separator 206 is a copper plate, an aluminum plate, or a zinc plate.

Further, the spacer 206 is a non-metallic plate, such as a plastic plate.

Further, in order to further ensure the stability of the air gap between the permanent magnet 203 and the armature 202, that is, to avoid the armature 202 from deforming due to heating, pressing or other reasons, or the air gap between the permanent magnet 203 and the armature 202 from changing due to installation errors of the permanent magnet 203, referring to fig. 2, 3 and 6, in the embodiment, the permanent magnet 203 is movably arranged in a preset range relative to the yoke 201, and the moving direction of the permanent magnet 203 is parallel to the direction of the magnetic force applied to the armature 202 by the permanent magnet 203 to make the armature 202 keep attaching to the two polar surfaces 20111, even if the permanent magnet 203 can be adjusted in a self-adaptive manner to a certain extent, the permanent magnet 203 is limited, and the permanent magnet 203 is prevented from moving along with the armature 202 to cause unsuccessful tripping when tripping; the preset range is set according to actual production and use requirements.

Further, as a possible embodiment, a groove 3 is provided on the inner wall of the housing 1, the permanent magnet 203 is installed in the groove 3, and the groove 3 defines the moving range of the permanent magnet.

Referring to fig. 6, in a preferred embodiment, two opposite guide plates 4 are disposed on the inner wall of the housing 1, and a space is maintained between the two guide plates 4 to form the groove 3; the orientation of the recess 3 towards the permanent magnet 203 is parallel to the direction of the magnetic force applied to the armature 202 by the armature 202 remaining in contact with the polar surface 20111, i.e., parallel to the normal to the polar surface 20111.

As a possible embodiment, a limiting plate (not labeled in the figures) can be fixed on the permanent magnet 203, and the limiting plate can be abutted with the end of the guide plate 4 to limit the movement of the permanent magnet 203 within a preset range.

As another possible embodiment, a limiting portion may be further disposed on the permanent magnet 203, a limiting sliding groove perpendicular to the direction of the groove 3 is further disposed on the guide plate 4, the limiting portion slides in the sliding groove, and the limiting portion can abut against two opposite inner walls of the sliding groove to limit the movement of the permanent magnet 203 within a preset range, for example, the permanent magnet 203 is disposed such that the cross-section is cross-shaped or T-shaped;

alternatively, a limit concave portion is provided on the permanent magnet 203, and a limit convex portion is provided on the guide plate 4, by which the movable range of the permanent magnet 203 is limited, for example, the permanent magnet is provided in an i-shaped section.

Referring to fig. 1 to 3, in the preferred embodiment, in the present embodiment, the armature 202 is rotatably connected to one branch 2011 of the yoke 201, and the armature 202 is movably disposed relative to the yoke 201 along a normal direction parallel to the polar surface 20111, so as to achieve an effect of increasing the tightness of the armature 202 against the polar surface 20111 of the branch 2011, so as to reduce the possibility of magnetic leakage.

More preferably, referring to fig. 1, 2, 3, and 5, in this embodiment, a non-magnetic support 5 is fixedly disposed on a branch 2011 of a yoke 201, an armature 202 is rotatably connected to the support 5, and a rotation shaft of the armature 202 rotating around the support 5 is slidably connected to the support 5, and the rotation shaft slides relative to the support 5 along a normal direction parallel to a polar surface 20111, so that the armature 202 can rotate relative to the yoke 201 and can also be movably disposed relative to the yoke 201 along a normal direction parallel to the polar surface 20111, and when tripping is triggered, the armature 202 swings relative to the support 5 under the pulling of a return spring 204, and tripping is rapid; in a normal state of tripping, the armature 202 can slide relative to the support 5, so that the armature 202 is better attached to the surface, and the possibility of magnetic leakage is reduced.

Further, referring to fig. 2, 3 and 5, in one possible embodiment, the armature 202 is provided with a rotation support surface 601 which is attached to a surface of the support 5 and can slide along the surface of the support 5, and the armature 202 can rotate relative to the support 5 around the rotation support surface 601.

As a more preferable embodiment, in the present embodiment, the armature 202 is fixed with a non-magnetic connecting member 6, and the rotation supporting surface 601 is disposed on the connecting member 6; the connecting piece 6 is connected with the support 5, so that the processing difficulty is reduced, and the abrasion of the armature 202 is reduced, so that the service life is influenced.

Further, in order to avoid that the armature 202 rotates relative to the support 5 by an excessively large opening angle when tripping is triggered, an angle limiting structure (not labeled in the figure) is further arranged between the support 5 and the armature 202, and the angle limiting structure can be attached to the surface of at least one of the support 5 and the armature 202 to limit the rotation angle of the armature 202 relative to the magnetic yoke 201.

As a preferred embodiment, in the present embodiment, the angle limiting structure is an inclined abutment surface 602 provided on the side of the rotation support surface 601, and the inclined abutment surface 602 can abut against the surface of the support 5 to limit the rotation angle of the armature 202 relative to the yoke 201.

Specifically, in the present embodiment, the inclined abutment surface 602 is provided on the link 6 on the side of the rotation support surface 601.

Referring to fig. 2, 3, and 5, in this embodiment, the connecting element 6 is provided with inclined abutting surfaces 602 on both sides of the rotation supporting surface 601, so that the connecting element 6 is in a V-shaped structure, and the rotation supporting surface 601 is a tip of the V-shaped structure, which is used as a rotation fulcrum of the connecting element 6 relative to the support 5, that is, a fulcrum of the armature 202 relative to the support 5, and a rotation axis of the armature 202 and the connecting element 6.

Further, in order to avoid abrasion of the rotation supporting surface 601 caused by repeated rotation of the connecting member 6, the rotation supporting surface 601 is configured as a cambered surface; and a wear-resistant coating can be formed on the rotating supporting surface 601, so that the service life of the repeated action of the armature 202 is prolonged, and the service life of the electromagnetic release is further prolonged.

One possible implementation is: a limit block is arranged on the support 5, and the armature 202 is in butt joint with the limit block after tripping and swinging relative to the support 5, so that the rotation opening angle of the armature 202 is limited by the limit block.

In other possible embodiments, a limit post may be provided on the connection element 6 or the armature 202, and after the armature 202 is tripped and swings relative to the support 5, the limit post abuts against the surface of the support 5, so as to limit the opening angle of the armature 202 by rotating.

Further, as a preferred embodiment, the holder 5 is detachably fixedly coupled with the yoke 201.

Furthermore, as an optimal implementation mode, refer to fig. 1 to 4, in this embodiment, a clamping protrusion 20112 is provided on a side surface of a branch 2011 of the magnetic yoke 201, a connecting hole 501 clamped and matched with the clamping protrusion 20112 is provided on the support 5, and the clamping protrusion 20112 is clamped and matched with the connecting hole 501, so that the support 5 and the magnetic yoke 201 can be detachably connected, and the support 5 and the magnetic yoke 201 can be conveniently mounted and dismounted, and are convenient to produce, process and assemble.

Furthermore, as a preferred implementation manner, in the present embodiment, the connection hole 501 is a through hole, and the connection hole 501 is set as a through hole, so that the connection condition between the support 5 and the magnetic yoke 201 can be observed conveniently in the assembling process, and the assembling is convenient;

in other possible embodiments, the connection hole 501 may also be configured as a blind hole.

Further, in the present embodiment, as a preferable embodiment, a magnetic conductive connection plate 7 is fixed to the permanent magnet 203, the connection plate 7 is provided by a branch 2011 where the yoke 201 and the armature 202 are connected, and the connection plate 7 is attached to a surface of the branch 2011 and is slidable with respect to a surface of the branch 2011; therefore, the connecting plate 7 can be adjusted adaptively along with the permanent magnet 203, so that the air gap value to be preset between the armature 202 and the permanent magnet 203 is kept, when the armature 202 is attached to the polar surface 20111, the permanent magnet 203 forms a permanent magnet loop with the magnetic yoke 201 through the connecting plate 7, the force arm for generating a magnetic action on the armature 202 is short, and the current required by the excitation coil 205 when the electromagnetic magnetic flux generated in the magnetic yoke 201 weakens the magnetic flux generated by the permanent magnet 203 so as to break the force balance between the force of the return spring 204 and the attraction force of the permanent magnet 203 is small, so that the electromagnetic release triggered by small current is suitable for being designed.

Furthermore, in a preferred embodiment, the connection plate 7 is also the aforementioned limit plate, and is fixed to an end of the permanent magnet 203 away from the armature 202, and can abut against an end surface of the guide plate 4, so as to counteract the moving range of the permanent magnet 203.

Further, as a preferred embodiment, the surfaces of the connecting plate 7 and the branch 2011 of the yoke 201, on which the connecting plate 7 slides, are set to be smooth, so as to reduce friction and avoid the effect of abrasion on the yoke 201.

As a possible implementation manner, the end face of the connecting plate 7, which is attached to the surface of the magnetic yoke 201, is configured as an arc-shaped face, so that the effects of reducing friction and avoiding abrasion to the magnetic yoke 201 can also be achieved.

Further, as a preferred embodiment, the excitation coil 205 is disposed on the connecting portion 2012, so that the longitudinal size of the yoke 201 can be reduced, the space can be fully utilized, and a large number of windings are provided, thereby achieving a compact structure.

Further, as a possible embodiment, the armature 202 is further provided with a first spring hook 8 to which the return spring 204 is connected.

As a further preferred embodiment, the first spring catch 8 is integrally formed with the connecting element 6.

Furthermore, the first spring hook 8 is formed by bending a part of the plate material of the connecting piece 6, so that the processing is convenient, and the material is saved.

Further, the first spring hook 8 abuts against the end of the armature 202, so that the armature 202 can be positioned in an auxiliary manner, and the armature 202 and the connecting piece 6 can be fixed conveniently.

Further, as a more preferable embodiment, the inner side surface of the connecting piece 6 is attached to the side surface of the armature 202 to assist in fixing the armature 202, so that the influence of the transmission of the armature 202 relative to the connecting piece 6 on the machining precision when the armature 202 and the connecting piece 6 are fixed is avoided, and in addition, the connection strength between the armature 202 and the connecting piece 6 is favorably enhanced.

Further, as a possible implementation manner, a second spring hook 502 is arranged on the support 5, and two ends of the return spring 204 are respectively connected with the first spring hook 8 and the second spring hook 502; therefore, the return spring 204 can be fixed with the magnetic yoke 201 and then assembled in the housing 1, thereby facilitating debugging.

Further, as a possible embodiment, a reset post 9 is connected to the housing 1, and the reset post 9 is used for driving the armature 202 to move so as to make the armature 202 abut against the two polar surfaces 20111 of the yoke 201 to reset.

Further, as a more preferable embodiment, in the present embodiment, the reset rod 9 abuts on a side of the armature 202 away from the side abutting on the polar surface 20111.

In other possible embodiments, an abutting plate may extend from a side surface of the armature 202, and the reset post 9 abuts against the abutting plate, so as to drive the armature 202 to move by applying pressure to the abutting plate, and further, the armature 202 is reset by abutting against the two polar surfaces 20111 of the yoke 201.

Furthermore, as a preferred embodiment, in the present embodiment, the armature 202 is provided with the buffering elastic sheet 10, and the buffering elastic sheet 10 is located on a side of the armature 202 away from the polar surface 20111; the buffering elastic sheet 10 is used for buffering the reset force applied to the armature 202 by the reset column 9, so that the deformation of the armature 202 is reduced.

Further, as a preferred embodiment, referring to fig. 2, 3, and 5, in this embodiment, the buffering elastic sheet 10 includes a fixed end 1001 and a movable end 1002, the fixed end 1001 and the movable end 1002 form an arched portion 1003 that faces away from a surface of the armature 202, the return post 9 abuts against a side of the arched portion 1003, the fixed end 1001 is fixed to the armature 202, and the movable end 1002 can slide along the surface of the armature 202; with such an arrangement, when the reset rod 9 applies force to the buffer elastic sheet 10, the arching portion 1003 can deform in a direction approaching the armature 202, and the movable portion can slide along the surface of the armature 202, so that a good buffer effect can be achieved.

Further, the buffering elastic sheet 10 is a non-magnetic sheet.

Furthermore, the buffering elastic sheet 10 and the connecting piece 6 are integrally formed, so that the material is saved, and the economy is better.

Further, as a preferred embodiment, referring to fig. 1, 2, 3 and 6, the housing 1 includes a closed box 101 having a lateral opening and a cover plate 102 detachably connected to the box 101 for closing the opening;

specifically, the side surface of the case 101 is a large-area surface, the end surface of the case 101 is a small-area surface, and the side opening is located on the side surface of the case 101 which is a large-area surface.

More specifically, in the present embodiment, the casing 101 has a square or rectangular parallelepiped shape.

Therefore, after the magnet yoke 201, the magnet exciting coil 205, the support 5, the connecting plate 7, the armature 202 and the return spring 204 are installed to form the tripping assembly 2, the tripping assembly can be integrally installed in the box body 101 from the opening on the side part of the box body 101, performance debugging after products are assembled is facilitated, whether parts are connected in place or not is visually checked, and quality inspection is facilitated.

Referring to fig. 6, as a preferred embodiment, in this embodiment, a clamping portion 1011 for clamping the magnetic yoke 201 is disposed on a surface of the box 101 opposite to the cover plate 102; the clamping position 1011 is used for assisting in fixing the magnetic yoke 201, so that the product is convenient to assemble.

Further, referring to fig. 4, a plug-in terminal 20113 is disposed on the branch 2011 of the magnetic yoke 201, and the plug-in terminal 20113 matches with the position lock 1011; the positioning and installation of the magnetic yoke 201 are convenient to realize; and the fixing of the magnet yoke 201 is assisted, so that the magnet yoke 201 is prevented from shaking in the use process.

Further, referring to fig. 6, a through groove 1012 is formed in a side surface of the case 101 perpendicular to the cover plate 102, and a lead wire or a terminal of the excitation coil 205 is inserted into the case 101 through the through groove 1012, so that a circuit connection is realized, and the structure is simple.

Further, the case 101 and the cover plate 102 are connected by a snap structure.

More specifically, referring to fig. 1 and 6, a fastening protrusion 1013 is disposed on a side surface of the case 101, and a fastening portion 1021 matching with the fastening protrusion 1013 is disposed on the cover plate 102, so that the case 101 and the cover plate 102 can be detachably connected by matching the fastening portion 1021 with the fastening protrusion 1013.

Further, referring to fig. 1, as a preferred embodiment, in this embodiment, the housing 1 is further provided with a connecting boss 11, the connecting boss 11 is provided with a reset hole 1101 through which the reset column 9 penetrates, and the connecting boss 11 can extend the contact length between the reset column 9 and the housing 1, so as to prevent the reset column 9 from shaking.

Further, referring to fig. 1 to 3, a limiting table 901 is disposed at one end of the reset column 9 abutting against the armature 202, and the limiting table 901 can abut against the surface of the connecting boss 11 to limit the reset column 9 from separating from the housing 1.

Further, as a preferred embodiment, when the inclined abutment surface 602 abuts against the surface of the support 5, the limit stand 901 can abut against the surface of the connection boss 11; the connection boss 11 can thus assist in limiting the inclined abutment surface 602 of the connection piece 6, making it better limiting the angle of rotation of the armature 202.

Furthermore, a connecting notch (not marked in the figure) is formed in the shell 1, and the connecting boss 11 is matched with the connecting notch in a clamping manner, so that the connecting boss 11 is fixed to the shell 1 conveniently.

The electromagnetic release provided by the invention can keep the air gap between the permanent magnet 203 and the armature 202 constant to be a preset air gap value through the air gap keeping device when the armature 202 is attached to the polar surfaces 20111 at the two ends of the magnetic yoke 201, so that the permanent magnet 203 can provide constant magnetic force for the armature 202, and the electromagnetic release can work reliably and stably;

moreover, because the magnetic force of the permanent magnet 203 is constant, the reset elastic force of the reset spring 204 can be accurately set, so that the moment balance between the reset elastic piece and the permanent magnet 203 can be destroyed by adopting a smaller current, and the permanent magnet is suitable for working conditions of low current and low power consumption;

in addition, the electromagnetic release provided by the invention adopts a structure design of magnetic leakage prevention, so that the magnetic leakage is further improved, the use stability of the electromagnetic release is improved, and the realization of the electromagnetic release working with low power consumption and low current becomes possible;

furthermore, the position of the permanent magnet 203 is specifically set, so that the moment arm of the permanent magnet 203 is reduced, the locking torque of the permanent magnet 203 applied to the armature 202 is reduced, and further, a small current is excited to the magnetic yoke 201 to offset partial magnetic flux of the permanent magnet 203, so that the tripping action can be realized.

In conclusion, the electromagnetic release provided by the invention has high use stability and can be suitable for the use working conditions of low current and low power consumption.

Example 2

This embodiment discloses an electrical protection device, which includes any one of the electromagnetic trips of embodiment 1, and which may be a leakage protection switch.

Through adopting the electromagnetic release that stability is higher and can be applicable to undercurrent drive contact, this electrical protection equipment can have the advantage that stability in use is strong, sensitivity is high.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims (18)

1. An electromagnetic release, comprising:

a U-shaped yoke (201), both branches (2011) of the yoke (201) having polar surfaces (20111);

the armature (202) is movably arranged relative to the magnetic yoke (201) and can be attached to the two polar surfaces (20111) to form a closed magnetic circuit;

the permanent magnet (203) provides magnetic force for keeping the armature (202) and the two polar surfaces (20111) in a state of attaching;

the return spring (204) is connected with the armature (202) and provides elastic force for separating the armature (202) from the two polar surfaces (20111);

and the air gap maintaining device is used for enabling the air gap between the permanent magnet (203) and the armature (202) to be a constant preset value when the armature (202) is attached to the two polar surfaces (20111).

2. An electromagnetic release according to claim 1, wherein the air gap retaining means is a non-magnetically permeable spacer plate (206), the spacer plate (206) being arranged between the armature (202) and the permanent magnet (203).

3. The electromagnetic trip according to claim 2, characterized in that the diaphragm (206) is fixed with at least one of the armature (202) and the permanent magnet (203).

4. An electromagnetic release according to claim 2 or 3, wherein the permanent magnet (203) is movably arranged in a predetermined range with respect to the yoke (201), and the direction in which the permanent magnet (203) moves is parallel to the direction in which the permanent magnet (203) applies a magnetic force to the armature (202) to keep the armature (202) in contact with the polar surfaces (20111).

5. Electromagnetic trip according to claim 1, 2 or 3, characterised in that the armature (202) is rotatably connected to one of the branches (2011) of the yoke (201) and that the armature (202) is movably arranged in relation to the yoke (201) in a direction parallel to the normal of the polar surface (20111).

6. The electromagnetic release according to claim 5, characterized in that a magnetically conductive connecting plate (7) is fixedly arranged on the permanent magnet (203), and the connecting plate (7) is attached to a side surface of a branch (2011) of the yoke (201) rotatably connected with the armature (202) and can slide along the side surface of the branch (2011).

7. Electromagnetic trip according to claim 5, characterized in that a magnetically non-conductive abutment (5) is fixedly arranged on the branch (2011) of the yoke (201), the armature (202) is rotatably connected to the abutment (5), the armature (202) is slidably connected to the abutment (5) about a rotation axis of rotation of the abutment (5), the rotation axis sliding with respect to the abutment (5) along a normal direction parallel to the polar surface (20111).

8. The electromagnetic trip according to claim 7, characterized in that the armature (202) is provided with a rotary support surface (601) which abuts against and is slidable along a surface of the seat (5), the armature (202) being rotatable about the rotary support surface (601) relative to the seat (5).

9. An electromagnetic release according to claim 8, characterised in that a magnetically non-conductive connecting piece (6) is fixed to the armature (202), the rotary support surface (601) being provided on the connecting piece (6).

10. Electromagnetic release according to claim 8 or 9, characterized in that an angular stop is further provided between the seat (5) and the armature (202), said angular stop being able to abut against a surface of at least one of the seat (5) and the armature (202) to define the angle of rotation of the armature (202) with respect to the yoke (201).

11. Electromagnetic release according to claim 10, characterized in that the angular limit structure is a slanted abutment surface (602) provided on the side of the rotation support surface (601), the slanted abutment surface (602) being able to abut against a surface of the abutment (5) to define the angle of rotation of the armature (202) with respect to the yoke (201).

12. The electromagnetic release according to claim 1, 2, 3, 6, 7, 8, 9 or 11, further comprising a reset post (9), wherein the reset post (9) is connected to the armature (202) for driving the armature (202) to move to abut against the two polar surfaces (20111) for resetting.

13. The electromagnetic release according to claim 12, characterized in that the armature (202) is provided with a damping spring (10), and the reset post (9) abuts against the damping spring (10).

14. Electromagnetic release according to claim 1, 2, 3, 6, 7, 8, 9 or 11, characterized in that the magnet yoke (201) is provided with an excitation coil (205).

15. Electromagnetic trip according to claim 14, characterized in that the yoke (201) comprises a connection (2012) between the two branches (2011) and the field coil (205) is arranged on the connection (2012).

16. The electromagnetic release of claim 1, 2, 3, 6, 7, 8, 9, or 11, wherein the electromagnetic release further comprises a housing (1).

17. Electromagnetic trip according to claim 16, characterized in that the housing (1) comprises a box (101) with a lateral opening and a cover plate (102) detachably connected to the box (101).

18. Electrical protection device, characterized in that it comprises an electromagnetic trip according to any one of claims 1 to 17.

Images