Electromagnetic release and electrical protection equipment including the electromagnetic release

Abstract

The present invention discloses an electromagnetic release and an electrical protection device including the electromagnetic release, relating to the technical field of electromagnetic tripping devices. The electromagnetic release provided by the present invention includes a U-shaped magnetic yoke, an armature, a permanent magnet, and a return spring. It further includes an air-gap maintaining device for making the air gap between the permanent magnet and the armature a constant preset value when the armature is in contact with the polar surfaces at both ends of the magnetic yoke. Through the air-gap maintaining device, when the armature is in contact with 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 the preset air-gap value, so that the suction force of the magnet on the armature is constant, making the operation of the electromagnetic release reliable and stable, and facilitating the precise design of the balance moment between the return spring and the magnet, enabling the use of a smaller current to break the moment balance between the return elastic member and the permanent magnet, making it possible to implement the scheme of a low-power electromagnetic release, and being applicable to the use conditions of low power consumption and low current.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic tripping devices, and in particular to an electromagnetic release and an electrical protection device including the electromagnetic release. Background Art

[0002] An electromagnetic release is a type of release, mainly used for short-circuit protection of circuits.

[0003] In the prior art, a Chinese patent with the publication number CN1763884B discloses an electromagnetic tripping device and an electrical protection device including this device. The electromagnetic tripping device includes a U-shaped armature, a tripping coil, a leaf plate, a spring of the leaf plate, and a reset pin of the leaf plate. The leaf plate pivots relative to the armature and can move to the polar surfaces at both ends of the armature to close the magnetic circuit formed by the armature and the leaf plate. The tripping coil is installed around a casing surrounding this path. When at rest, there is no current in the coil, and the leaf plate is held against the armature by the magnetic flux generated by a magnet. When a current appears in the coil, when this current has reached a certain value pre-determined by the balance between the torque of the spring and the magnetic torque generated by the magnetic flux of the magnet, the leaf plate opens.

[0004] Due to inevitable assembly errors during the assembly process, in actual use of this electromagnetic tripping device, there will be an error between the gap between the leaf plate and the magnet and the designed gap. In addition, after tripping, the leaf plate is reset by pushing against it with a reset pin. When the reset thrust applied by the reset pin to the leaf plate is too large or after multiple resets, the leaf plate will be deformed and warped, resulting in a change in the gap between the leaf plate and the magnet.

[0005] In summary, in the electromagnetic tripping device in the prior art, the gap between the leaf plate and the magnet is uncontrollable, so the suction force of the magnet on the leaf plate is not constant. When the same current is passed into the coil, the electromagnetic tripping device may trip or may not trip, resulting in the problem of unstable operation of the electromagnetic tripping device, which will seriously affect the use.

[0006] Therefore, a new electromagnetic release solution is needed. Summary of the Invention

[0007] In order to overcome at least one of the above-mentioned defects in the prior art, the first object of the present invention is to provide an electromagnetic release to solve the problem of unstable use of the existing electromagnetic release, and at the same time, the electromagnetic release can be applied to working conditions with small current and low power consumption.

[0008] The technical solution adopted by the present invention to solve its problems is as follows:

[0009] An electromagnetic release, comprising:

[0010] A U-shaped magnetic yoke, both branches of the magnetic yoke having polar surfaces;

[0011] An armature, movably arranged relative to the yoke, can be attached to the two polar surfaces of the yoke to form a closed magnetic circuit.

[0012] A permanent magnet provides magnetic force to keep the armature attached to the two polar surfaces of the yoke.

[0013] A return spring is connected to the armature and provides elastic force for the armature to disengage from the two polar surfaces of the yoke.

[0014] An air-gap maintaining device is used to make the air-gap between the permanent magnet and the armature a constant preset value when the armature is attached to the two polar surfaces of the yoke end.

[0015] The electromagnetic release provided by the present invention includes an air-gap maintaining device. When the armature is attached to the polar surfaces of the two branches of the yoke, the air-gap maintaining device keeps the air-gap between the permanent magnet and the armature constant at a preset air-gap value, so as to ensure that the permanent magnet provides a constant magnetic force to the armature, avoid the influence of assembly clearance and armature deformation, make the operation of the electromagnetic release reliable and stable, and moreover, since the magnetic force of the permanent magnet is constant, the reset elastic force of the return spring can be accurately set in design, so that a smaller current can be used to break the torque balance between the reset elastic member and the permanent magnet, which is applicable to working conditions with small current and low power consumption.

[0016] Further, the air-gap maintaining device is a non-magnetic partition plate, and the partition plate is arranged between the armature and the permanent magnet.

[0017] Further, the partition plate is fixed to at least one of the armature and the permanent magnet.

[0018] Further, the permanent magnet is movably arranged relative to the yoke within a preset range, and the moving direction of the permanent magnet is parallel to the direction in which the permanent magnet applies magnetic force to the armature to keep the armature attached to the two polar surfaces.

[0019] Further, one of the branches of the armature and the yoke is rotatably connected, and the armature is movably arranged relative to the yoke along the normal direction parallel to the polar surface.

[0020] Further, a magnetic conductive connecting plate is fixedly arranged on the permanent magnet, and the connecting plate is attached to and can slide along the side surface of the branch of the yoke rotatably connected to the armature.

[0021] Further, a non-magnetic support is fixedly arranged on a branch of the yoke, the armature is rotatably connected to the support, a rotation axis of the armature rotating around the support is slidably connected to the support, and the rotation axis slides relative to the support along a normal direction parallel to the polar surface.

[0022] Further, a rotation support surface that abuts against the surface of the support and can slide along the surface of the support is arranged on the armature, and the armature can rotate relative to the support around the rotation support surface.

[0023] Further, a non-magnetic connecting piece is fixed on the armature, and the rotation support surface is arranged on the connecting piece.

[0024] Further, an angle limiting structure is further arranged between the support and the armature, and the angle limiting structure can abut against the surface of at least one of the support and the armature to limit the rotation angle of the armature relative to the yoke.

[0025] Further, the angle limiting structure is an inclined abutting surface arranged on one side of the rotation support surface, and the inclined abutting surface can abut against the surface of the support to limit the rotation angle of the armature relative to the yoke.

[0026] Further, the electromagnetic release further includes a reset post (9), and the reset post (9) is connected to the armature (202) and is used for driving the armature (202) to move so as to abut against the two polar surfaces (20111) for resetting.

[0027] Further, a buffer spring piece is arranged on the armature, and the reset post abuts against the buffer spring piece.

[0028] Further, an exciting coil is arranged on the yoke.

[0029] Further, the yoke includes a connecting portion connected between the two branches, and the exciting coil is arranged on the connecting portion.

[0030] Further, the electromagnetic release further includes a housing.

[0031] Further, the housing includes a box body with a lateral opening and a cover plate detachably connected to the box body.

[0032] Based on the same inventive concept, a second object of the present invention is to provide an electrical protection device, and the electrical protection device includes the above-mentioned electromagnetic release.

[0033] To sum up, the electromagnetic release provided by the present invention and the electrical protection device including the electromagnetic release have the following technical effects:

[0034] 1) By setting up an air-gap maintaining device, when the polar surfaces of the armature and the two branches of the yoke are in contact, the air gap between the permanent magnet and the armature is kept constant at a preset air-gap value, making the gap between the armature and the magnet controllable. Thus, the suction force of the magnet on the armature is constant, ensuring the reliable and stable operation of the electromagnetic release. Moreover, it is convenient to accurately design the balance torque between the return spring and the magnet, enabling the use of a smaller current to break the torque balance between the return elastic member and the permanent magnet, making it possible to implement the low-power electromagnetic release scheme, which is suitable for low-power consumption and low-current operating conditions.

[0035] 2) Using a non-magnetic separator as the air-gap maintaining device, the structure is simple, facilitating structural design, machining, and production.

[0036] 3) The permanent magnet is set to be movable within a preset range. When the polar surfaces of the armature and the two branches of the yoke are in contact, the permanent magnet can move relative to the yoke within a certain range, enabling the permanent magnet to remain in contact with the armature through the separator, thus preventing the armature from being unable to maintain a constant preset air gap with the permanent magnet due to deformation or other reasons, further enhancing the stability of the electromagnetic release during use.

[0037] 4) The permanent magnet is connected to the yoke through a connecting plate. On the one hand, it can simplify the fixing structure of the permanent magnet. On the other hand, since the connecting plate is connected to the branch of the yoke close to the rotation axis of the armature, it can reduce the force arm of the permanent magnet and the locking torque exerted by the permanent magnet on the armature. Further, it becomes possible to use a small current to excite the yoke to counteract part of the magnetic flux of the permanent magnet and thus achieve the tripping action.

[0038] 5) One of the branches of the armature is rotatably connected to the yoke. During the tripping action, the armature swings relative to the yoke, enabling rapid tripping. By setting the armature to be movable relative to the yoke along the normal direction parallel to the polar surface, the contact between the armature and the polar surface becomes closer, reducing the magnetic leakage between the armature and the yoke, further enhancing the stability of the electromagnetic release during use, and making it possible to implement an electromagnetic release that operates with low power consumption and small current.

[0039] 6) The armature is connected to the support through a non-magnetic connecting member, facilitating production and machining.

[0040] 7) The inclined contact surface provided on the rotation support side of the connecting member can limit the rotation angle of the armature. The structure is ingenious and easy to machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is an exploded view of the structure of the electromagnetic release in one embodiment of the present invention;

[0042] Figure 2 is an internal structure diagram of the electromagnetic release in the triggered tripping state in one embodiment of the present invention;

[0043] Figure 3 Schematic diagram of the internal structure of the electromagnetic release in the untriggered release state in one embodiment of the present invention;

[0044] Figure 4 Schematic diagram of the structure of the exciting coil, yoke and support of the electromagnetic release in one embodiment of the present invention;

[0045] Figure 5 Schematic diagram of the structure of the buffer spring piece and the connecting piece in one embodiment of the present invention;

[0046] Figure 6 Schematic diagram of the internal structure of the box body in one embodiment of the present invention.

[0047] Among them, the meanings of the reference numerals are as follows:

[0048] 1. Housing; 101. Box body; 1011. Card position; 1012. Through groove; 1013. Buckle bump; 102. Cover plate; 1021. Buckling part; 2. Release assembly; 201. Yoke; 2011. Branch; 20111. Polarity surface; 20112. Clamping protrusion; 20113. Insertion end; 2012. Connection part; 202. Armature; 203. Permanent magnet; 204. Return spring; 205. Exciting coil; 206. Partition board; 3. Groove; 4. Guide plate; 5. Support; 501. Connection hole; 502. Second spring hook; 6. Connecting piece; 601. Rotating support surface; 602. Inclined abutting surface; 7. Connecting plate; 8. First spring hook; 9. Return column; 901. Limit platform; 10. Buffer spring piece; 1001. Fixed end; 1002. Movable end; 1003. Arch part; 11. Connecting boss; 1101. Return hole. Detailed implementation manners

[0049] 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 accompanying drawings in the embodiments of the present invention.

[0050] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention.

[0052] Embodiment 1

[0053] Referring to Figures 1 - 6 , the present invention discloses an electromagnetic release, which includes a housing 1 and a release assembly 2 disposed in the housing 1. The release assembly 2 includes a U-shaped yoke 201, an armature 202, a permanent magnet 203, a return spring 204, and an exciting coil 205. The yoke 201 has two parallel branches 2011 and a connecting portion 2012 connecting the two branches 2011. Both branches 2011 of the yoke 201 have polar surfaces 20111, and the exciting coil 205 is disposed on the yoke 201;

[0054] The armature 202 is movably disposed relative to the yoke 201 and can be in contact with the two polar surfaces 20111 to form a closed magnetic circuit;

[0055] The return spring 204 is connected to the armature 202. Referring to Figure 2 , when the electromagnetic release is in the tripped state, it provides an elastic force for the armature 202 to disengage from the two polar surfaces 20111;

[0056] Referring to Figure 3 , when the electromagnetic release is in the non-triggered tripped state, the permanent magnet 203 provides a magnetic force for the armature 202 to remain in contact with the two polar surfaces 20111.

[0057] Referring to Figures 1 - 3 , the release assembly 2 further includes an air gap maintaining device for making the air gap between the permanent magnet 203 and the armature 202 a constant preset value when the armature 202 is in contact with the two polar surfaces 20111.

[0058] The preset air gap value is designed according to the actual application requirements of the electromagnetic release.

[0059] As a preferred embodiment, the air gap maintaining device is a non-magnetic partition 206, and the partition 206 is disposed between the armature 202 and the permanent magnet 203; the armature 202 and the permanent magnet 203 are separated by the partition 206, so that the air gap between the armature 202 and the permanent magnet 203 is maintained at a constant value.

[0060] In other possible embodiments, the air gap maintaining device may also be an air cushion, a non-magnetic ball or 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 in contact with the two polar surfaces 20111.

[0061] Further, the partition plate 206 is fixed to at least one of the armature 202 and the permanent magnet 203.

[0062] Further, as a preferred embodiment, in this embodiment, the partition plate 206 is fixed to the side of the armature 202 facing the permanent magnet 203, and the surface of the partition plate 206 facing away from the armature 202 can be in contact with the surface of the permanent magnet 203, so that the air gap between the permanent magnet 203 and the armature 202 is maintained at a constant preset value.

[0063] Furthermore, the partition plate 206 can be set to be welded to the surface of the armature 202, or can be embedded in the armature 202 and its surface protrudes from the surface of the armature 202; the partition plate 206 can also be fixed to the armature 202 by other methods in the prior art.

[0064] In other possible embodiments, the partition plate 206 can be fixed to the permanent magnet 203 and extend toward the armature 202, so that the partition plate 206 can be in contact with the surface of the armature 202, so that the air gap between the permanent magnet 203 and the armature 202 is maintained at a constant preset value.

[0065] Further, the partition plate 206 is a copper plate, an aluminum plate or a zinc plate.

[0066] Further, the partition plate 206 is a non-metal plate, such as a plastic plate.

[0067] Further, to further ensure the stability of the air gap maintained between the permanent magnet 203 and the armature 202, that is, to prevent the armature 202 from deforming due to heat, pressure or other reasons, or the permanent magnet 203 from causing a change in the air gap between the permanent magnet 203 and the armature 202 due to installation errors or other reasons, refer to Figure 2 、 Figure 3 and Figure 6 , in this embodiment, the permanent magnet 203 is arranged to be movable relative to the magnetic yoke 201 within a preset range, and the direction of movement of the permanent magnet 203 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 two-polarity surfaces 20111, that is, when the permanent magnet 203 can be adaptively moved and adjusted to a certain extent, the permanent magnet 203 is limited, so as to avoid the permanent magnet 203 moving with the armature 202 during tripping and resulting in unsuccessful tripping; the preset range is set according to actual production and use requirements.

[0068] Further, as a possible embodiment, a groove 3 is provided on the inner wall of the housing 1, and the permanent magnet 203 is installed in the groove 3, and the movement range of the permanent magnet is defined by the groove 3.

[0069] As a preferred embodiment, refer toFigure 6 In this embodiment, two oppositely arranged guide plates 4 are provided on the inner wall of the housing 1, and a gap is maintained between the two guide plates 4 to form the groove 3; the direction of the groove 3 facing the permanent magnet 203 is parallel to the direction in which the armature 202 is attracted by the magnetic force to be in close contact with the polar surface 20111, that is, parallel to the normal direction of the polar surface 20111.

[0070] As a possible implementation manner, a limiting plate (not marked in the figure) can be fixed on the permanent magnet 203, and the limiting plate can abut against the end of the guide plate 4 to limit the movement of the permanent magnet 203 within a preset range.

[0071] As another possible implementation manner, a limiting portion can also be provided on the permanent magnet 203, and a limiting sliding groove perpendicular to the orientation of the groove 3 is also provided on the guide plate 4. The limiting portion slides in the sliding groove, and the limiting portion can abut against the 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 provided with a cross-shaped or T-shaped cross-section;

[0072] Alternatively, a limiting recess is provided on the permanent magnet 203, and a limiting protrusion is provided on the guide plate 4, and the movement range of the permanent magnet 203 is restricted by the limiting protrusion. For example, the permanent magnet is provided with an I-shaped cross-section.

[0073] Refer to Figures 1 - 3 As a preferred implementation manner, in this embodiment, the armature 202 is rotatably connected to one branch 2011 of the yoke 201, and the armature 202 can be movably arranged relative to the yoke 201 along the normal direction parallel to the polar surface 20111, so as to increase the tightness of the contact between the armature 202 and the polar surface 20111 of the branch 2011, thereby reducing the possibility of magnetic leakage.

[0074] More preferably, refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 In this embodiment, a non-magnetic support 5 is fixedly provided on the branch 2011 of the yoke 201, the armature 202 is rotatably connected to the support 5, and the rotation axis of the armature 202 rotating around the support 5 is slidably connected to the support 5. The rotation axis slides relative to the support 5 along the normal direction parallel to the polar surface 20111, so that the armature 202 can not only rotate relative to the yoke 201, but also be movably arranged relative to the yoke 201 along the normal direction parallel to the polar surface 20111. When the trip is triggered, the armature 202 swings relative to the support 5 under the pulling of the return spring 204, and the trip is rapid; in the normal state when the trip is not triggered, since the armature 202 can slide relative to the support 5, the contact effect between the armature 202 and the surface is better, reducing the possibility of magnetic leakage.

[0075] Further, referring to Figure 2 , Figure 3 , Figure 5 a possible implementation, a rotating support surface 601 is provided on the armature 202, which is in contact with the 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 rotating support surface 601.

[0076] As a more preferable implementation, in this embodiment, a non-magnetic connecting member 6 is fixed on the armature 202, and the rotating support surface 601 is arranged on the connecting member 6; the connecting member 6 is connected to the support 5, reducing the processing difficulty and reducing the wear of the armature 202, which may affect the service life.

[0077] Further, to prevent the armature 202 from rotating and opening at too large an angle relative to the support 5 when triggering the tripping, an angle limiting structure (not marked in the figure) is also provided between the support 5 and the armature 202. The angle limiting structure can be in contact with 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 yoke 201.

[0078] As a preferred implementation, in this embodiment, the angle limiting structure is an inclined abutting surface 602 arranged on one side of the rotating support surface 601. The inclined abutting surface 602 can be in contact with the surface of the support 5 to limit the rotation angle of the armature 202 relative to the yoke 201.

[0079] Specifically, in this embodiment, the inclined abutting surface 602 is arranged on the connecting member 6 and is located on one side of the rotating support surface 601.

[0080] Referring to Figure 2 , Figure 3 , Figure 5 , in this embodiment, inclined abutting surfaces 602 are arranged on both sides of the rotating support surface 601 of the connecting member 6, so that the connecting member 6 has a V-shaped structure. The rotating support surface 601 is the tip of the V-shaped structure, which serves as the rotation fulcrum of the connecting member 6 relative to the support 5, that is, the rotation fulcrum of the armature 202 relative to the support 5, and is also the location of the rotation axis of the armature 202 and the connecting member 6. In a possible implementation, it is only necessary to arrange the inclined abutting surface 602 on the surface where the connecting member 6 swings upward relative to the support 5 and abuts against the support 5, that is, only retaining the inclined abutting surface 602 at the rotation fulcrum shown in the figure can also achieve the function of the angle limiting structure.

[0081] Further, to prevent the repeated rotation of the connecting member 6 from causing wear of the rotating support surface 601, the rotating support surface 601 is arranged as an arc surface; a wear-resistant coating can also be applied on the rotating support surface 601 to extend the service life of the repeated operation of the armature 202, and further extend the service life of the electromagnetic release.

[0082] One possible implementation is as follows: A limiting block is provided on the support 5. After the armature 202 is tripped and swings relative to the support 5, it abuts against the limiting block, thereby restricting the rotation opening angle of the armature 202 through the limiting block.

[0083] In other possible implementations, a limiting post can also be provided on the connecting member 6 or the armature 202. After the armature 202 is tripped and swings relative to the support 5, it abuts against the surface of the support 5 through the limiting post, thereby restricting the rotation opening angle of the armature 202.

[0084] Further, as a preferred implementation, the support 5 and the yoke 201 are detachably and fixedly connected.

[0085] Even further, as a preferred implementation, refer to Figures 1 - 4 , in this embodiment, a clamping protrusion 20112 is provided on the side surface of the branch 2011 of the yoke 201, and a connection hole 501 that is in clamping fit with the clamping protrusion 20112 is provided on the support 5. Through the clamping fit between the clamping protrusion 20112 and the connection hole 501, the detachable connection between the support 5 and the yoke 201 is realized, thereby facilitating the installation and disassembly of the support 5 and the yoke 201, and facilitating production, processing, and assembly.

[0086] Even further, as a preferred implementation, in this embodiment, the connection hole 501 is a through hole. Setting the connection hole 501 as a through hole facilitates observing the connection situation between the support 5 and the yoke 201 during the assembly process and is convenient for assembly;

[0087] In other possible implementations, the connection hole 501 can also be set as a blind hole.

[0088] Further, as a preferred implementation, in this embodiment, a magnetically conductive connecting plate 7 is fixed on the permanent magnet 203. The connecting plate 7 is arranged adjacent to the branch 2011 where the yoke 201 is connected to the armature 202, and the connecting plate 7 is in contact with the surface of this branch 2011 and can slide relative to the surface of the branch 2011; thus, the connecting plate 7 can be adaptively adjusted along with the permanent magnet 203 to maintain a specific preset air gap value between the armature 202 and the permanent magnet 203. When the armature 202 is in contact with the polar surface 20111, the permanent magnet 203 forms a permanent magnetic circuit with the yoke 201 through the connecting plate 7. Furthermore, the force arm of the magnetic force acting on the armature 202 is relatively short, and the current required when the excitation coil 205 generates an electromagnetic magnetic flux in the yoke 201 to weaken the magnetic flux generated by the permanent magnet 203 and thus destroy the force balance of the suction force between the return spring 204 and the permanent magnet 203 is relatively small. Therefore, it is suitable for designing an electromagnetic release triggered by a small current.

[0089] Further, as a preferred embodiment, in this embodiment, the connecting plate 7 is also the aforementioned limiting plate, which is fixed to one end of the permanent magnet 203 facing away from the armature 202 and can abut against the end face of the guiding plate 4 to limit the moving range of the permanent magnet 203.

[0090] Further, as a preferred embodiment, the surfaces of the connecting plate 7 and the branch 2011 of the yoke 201 where the connecting plate 7 slides are both set to be smooth, so as to reduce friction and avoid wearing the yoke 201.

[0091] As a possible embodiment, the end face of the connecting plate 7 that abuts against the surface of the yoke 201 is set to be an arc surface, which can also reduce friction and avoid wearing the yoke 201.

[0092] Further, as a preferred embodiment, the exciting coil 205 is arranged on the connecting portion 2012, so as to reduce the longitudinal dimension of the yoke 201, make full use of the space, arrange more windings, and have a compact structure.

[0093] Further, as a possible embodiment, a first spring hook 8 for connecting the return spring 204 is also arranged on the armature 202.

[0094] As a more preferred embodiment, the first spring hook 8 is integrally formed with the connecting member 6.

[0095] Furthermore, the first spring hook 8 is formed by bending a part of the sheet material of the connecting member 6, which is convenient for processing and saves materials.

[0096] Further, the first spring hook 8 abuts against the end of the armature 202, so as to assist in positioning the armature 202 and facilitate the fixing of the armature 202 and the connecting member 6.

[0097] Further, as a more preferred embodiment, the inner side surface of the connecting member 6 abuts against the side surface of the armature 202 to assist in fixing the armature 202, avoid the armature 202 transmitting relative to the connecting member 6 when fixing the armature 202 and the connecting member 6, which affects the processing accuracy, and also helps to enhance the connection strength between the armature 202 and the connecting member 6.

[0098] Further, as a possible embodiment, a second spring hook 502 is arranged on the support 5, and the two ends of the return spring 204 are respectively connected to the first spring hook 8 and the second spring hook 502; thus, the return spring 204 can be fixed to the yoke 201 and then assembled into the housing 1, which is convenient for debugging.

[0099] Further, as a possible implementation, a reset post 9 is connected to the housing 1. The reset post 9 is used to drive the armature 202 to act so that the armature 202 abuts against the two polar surfaces 20111 of the yoke 201 and is reset.

[0100] Further, as a more preferable implementation, in this embodiment, the reset post 9 abuts against the side of the armature 202 that is opposite to the side that abuts against the polar surface 20111.

[0101] In other possible implementation manners, a contact plate may extend from the side surface of the armature 202. The reset post 9 abuts against the contact plate, and the armature 202 is driven to act by applying pressure to the contact plate, so that the armature 202 abuts against the two polar surfaces 20111 of the yoke 201 and is reset.

[0102] Furthermore, as a preferred implementation, in this embodiment, a buffer spring piece 10 is arranged on the armature 202. The buffer spring piece 10 is located on the side of the armature 202 that is opposite to the polar surface 20111; the buffer spring piece 10 buffers the reset force applied by the reset post 9 to the armature 202, and reduces the deformation of the armature 202.

[0103] Further, as a preferred implementation, referring to Figure 2 、 Figure 3 、 Figure 5 , in this embodiment, the buffer spring piece 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 deviates from the surface of the armature 202. The reset post 9 abuts against one 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; by setting it like this, when the reset post 9 applies force to the buffer spring piece 10, the arched portion 1003 can deform in the direction close to the armature 202 and the movable portion can slide along the surface of the armature 202, which can achieve a good buffering effect.

[0104] Further, the buffer spring piece 10 is a non-magnetic conductive sheet.

[0105] Further, the buffer spring piece 10 and the connecting member 6 are integrally formed, which is beneficial to saving materials and has good economy.

[0106] Further, as a preferred implementation, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 , the housing 1 includes a closed box body 101 with a lateral opening and a cover plate 102 that is detachably connected to the box body 101 and is used to close the opening;

[0107] Specifically, the larger surface area of the box body 101 is its side surface, and the smaller surface area is its end surface. The side opening is located on the larger surface area of the box body 101, that is, the side surface.

[0108] More specifically, in this embodiment, the box body 101 is in the shape of a cube or a cuboid.

[0109] Thus, after the yoke 201, the excitation coil 205, the support 5, the connecting plate 7, the armature 202, and the return spring 204 are installed to form the tripping component 2, it can be integrally installed in the box body 101 from the opening on the side of the box body 101, which is convenient for performance debugging after assembling the product, visually checking whether each component is connected in place, and convenient for quality inspection.

[0110] Refer to Figure 6 , as a preferred embodiment, in this embodiment, a clamping position 1011 for clamping the yoke 201 is provided on the surface of the box body 101 opposite to the cover plate 102; the yoke 201 is assisted to be fixed through the clamping position 1011, which is convenient for assembling the product.

[0111] Furthermore, refer to Figure 4 , a plug-in end 20113 is provided on the branch 2011 of the yoke 201, and the plug-in end 20113 is matched with the clamping position 1011; it is convenient to realize the positioning installation of the yoke 201; and it assists in fixing the yoke 201 to prevent the yoke 201 from shaking during use.

[0112] Further, refer to Figure 6 , a through groove 1012 is opened on the side surface of the box body 101 perpendicular to the cover plate 102, and the through groove 1012 allows the wires or terminals of the excitation coil 205 to pass out of the box body 101 to realize circuit connection, and the structure is simple.

[0113] Furthermore, the box body 101 and the cover plate 102 are connected by a snap structure.

[0114] More specifically, refer to Figure 1 、 Figure 6 , snap bumps 1013 are provided on the side surface of the box body 101, and a buckling portion 1021 matching the snap bumps 1013 is provided on the cover plate 102. The detachable connection between the box body 101 and the cover plate 102 is realized through the cooperation of the buckling portion 1021 and the snap bumps 1013.

[0115] Further, refer to Figure 1 , as a preferred embodiment, in this embodiment, a connecting boss 11 is further provided on the housing 1, and a return hole 1101 for the return post 9 to pass through is provided on the connecting boss 11. The setting of the connecting boss 11 can extend the contact length between the return post 9 and the housing 1, thereby preventing the return post 9 from shaking.

[0116] Further, refer toFigures 1 - 3 , One end of the reset post 9 in contact with the armature 202 is provided with a limit platform 901, and the limit platform 901 can abut against the surface of the connecting boss 11 to prevent the reset post 9 from detaching from the housing 1.

[0117] Furthermore, as a preferred embodiment, when the inclined abutting surface 602 is in contact with the surface of the support 5, the limit platform 901 can abut against the surface of the connecting boss 11; thus, the connecting boss 11 can assist in limiting the inclined abutting surface 602 of the connecting member 6, making the limitation of the rotation angle of the armature 202 better.

[0118] Furthermore, a connecting notch (not marked in the figure) is provided on the housing 1, and the connecting boss 11 is in snap-fit with the connecting notch, facilitating the fixation of the connecting boss 11 to the housing 1.

[0119] The electromagnetic release provided by the present invention can, through the air gap maintaining device, keep the air gap between the permanent magnet 203 and the armature 202 constant at a preset air gap value when the armature 202 is in contact with the polar surfaces 20111 at both ends of the yoke 201, so as to ensure that the permanent magnet 203 provides a constant magnetic force to the armature 202, making the operation of the electromagnetic release reliable and stable;

[0120] Moreover, since 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 it is possible to design and use a smaller current to break the torque balance between the reset elastic member and the permanent magnet 203, which is suitable for working conditions with small current and low power consumption;

[0121] In addition, the electromagnetic release provided by the present invention adopts a leakage magnetic prevention structural design, which further improves the stability of the electromagnetic release during use, making it possible to realize an electromagnetic release with low power consumption and small current operation;

[0122] Furthermore, by specifically setting the position of the permanent magnet 203, the force arm of the permanent magnet 203 is reduced, and the locking torque exerted by the permanent magnet 203 on the armature 202 is reduced. Further, it is possible to make a small current excite the yoke 201 to counteract part of the magnetic flux of the permanent magnet 203 and thus realize the tripping action.

[0123] In summary, the electromagnetic release provided by the present invention has high stability in use and can be applied to working conditions with small current and low power consumption.

[0124] Embodiment 2

[0125] This embodiment discloses an electrical protection device, which includes any one of the electromagnetic releases in Embodiment 1, and this electrical protection device can be a leakage protection switch.

[0126] By adopting an electromagnetic release with higher stability and applicable to small-current drive triggering, this electrical protection device can have the advantages of strong use stability and high sensitivity.

[0127] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. An electromagnetic release, characterized in that, Comprising: A U-shaped yoke (201), both branches (2011) of the yoke (201) having polar surfaces (20111); An armature (202), movably arranged relative to the yoke (201), capable of adhering to the two polar surfaces (20111) to form a closed magnetic circuit; A permanent magnet (203), providing magnetic force to keep the armature (202) in an adhering state with the two polar surfaces (20111); A return spring (204), connected to the armature (202), providing elastic force for the armature (202) to disengage from the two polar surfaces (20111); An air gap maintaining device, used to make the air gap between the permanent magnet (203) and the armature (202) a constant preset value when the armature (202) adheres to the two polar surfaces (20111); The air gap maintaining device is a non-magnetic separator (206), the separator (206) being arranged between the armature (202) and the permanent magnet (203); the separator (206) is fixed to at least one of the armature (202) and the permanent magnet (203); the permanent magnet (203) is movably arranged relative to the yoke (201) within a preset range, and the direction in which the permanent magnet (203) moves is parallel to the direction in which the permanent magnet (203) applies magnetic force to the armature (202) to keep the armature (202) in an adhering state with the two polar surfaces (20111); on the inner wall of the housing (1), there are two oppositely arranged guide plates (4), and a groove (3) is formed by maintaining a spacing between the two guide plates (4), a limiting plate is fixed on the permanent magnet (203), and the limiting plate can abut against the end of the guide plate (4) to limit the movement of the permanent magnet (203) within a preset range; A magnetic conductive connecting plate (7) is fixedly arranged on the permanent magnet (203), and the connecting plate (7) abuts against and can slide along the side surface of the branch (2011) of the yoke (201) where the yoke (201) is rotatably connected to the armature (202).

2. The electromagnetic release according to claim 1, wherein The armature (202) is rotatably connected to one of the branches (2011) of the yoke (201), and the armature (202) is movably arranged relative to the yoke (201) along the normal direction parallel to the polar surface (20111).

3. The electromagnetic release according to claim 2, wherein, A non-magnetic support (5) is fixedly arranged on the branch (2011) of the yoke (201), the armature (202) is rotatably connected to the support (5), the rotation axis of the armature (202) rotating around the support (5) is slidably connected to the support (5), and the rotation axis slides relative to the support (5) along the normal direction parallel to the polar surface (20111).

4. The electromagnetic release according to claim 3, characterized in that, A rotating support surface (601) that abuts against the surface of the support (5) and can slide along the surface of the support (5) is arranged on the armature (202), and the armature (202) can rotate relative to the support (5) around the rotating support surface (601).

5. The electromagnetic release according to claim 4, characterized in that, A non-magnetic connecting member (6) is fixed on the armature (202), and the rotating support surface (601) is arranged on the connecting member (6).

6. The electromagnetic release according to claim 4 or 5, characterized in that, An angle limiting structure is further arranged between the support (5) and the armature (202). The angle limiting structure can be in contact with 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).

7. The electromagnetic release according to claim 6, wherein The angle limiting structure is an inclined abutting surface (602) arranged on one side of the rotating support surface (601). The inclined abutting surface (602) can be in contact with the surface of the support (5) to limit the rotation angle of the armature (202) relative to the magnetic yoke (201).

8. The electromagnetic release according to claim 1, 3, 4, 5 or 7, characterized in that, The electromagnetic release further includes a reset post (9). The reset post (9) is connected to the armature (202) and is used to drive the movement of the armature (202) to make it in contact with the two polar surfaces (20111) for reset.

9. The electromagnetic release according to claim 8, wherein, A buffer spring piece (10) is arranged on the armature (202), and the reset post (9) abuts against the buffer spring piece (10).

10. The electromagnetic release according to claim 1, 3, 4, 5 or 7, characterized in that, The magnetic yoke (201) is provided with an exciting coil (205).

11. The electromagnetic release according to claim 10, characterized in that, The magnetic yoke (201) includes a connecting portion (2012) connected between the two branches (2011), and the exciting coil (205) is arranged on the connecting portion (2012).

12. The electromagnetic release according to claim 1, 3, 4, 5 or 7, characterized in that, The electromagnetic release further includes a housing (1).

13. The electromagnetic release according to claim 12, characterized in that, The housing (1) includes a box body (101) having a lateral opening and a cover plate (102) detachably connected to the box body (101).

14. An electrical protection device, characterized by comprising the electromagnetic release according to any one of claims 1-13.

Images