Relay

Abstract

The utility model discloses a relay, which comprises a pair of static contacts, a movable contact piece, a first magnetizer, a second magnetizer and a third magnetizer, and is characterized in that the movable contact piece is used for being in contact with the pair of static contacts; the first magnetizer is arranged on one side, facing the static contact, of the movable contact piece; the second magnetizer is connected to the movable contact piece and is arranged on one side, opposite to the static contact, of the movable contact piece; the third magnetizer is connected to the second magnetizer and is arranged on one side, back to the static contact, of the second magnetizer, and the third magnetizer and the second magnetizer are respectively used for forming a magnetic conductive loop with the first magnetizer.

Description

Technical Field

[0001] The present application relates to the technical field of electric control devices, and in particular to a relay. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. A relay is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] A high-voltage DC relay is a type of relay. In the related art, a high-voltage DC relay includes a pair of stationary contacts and a moving contact. The moving contact is used to contact with a pair of stationary contacts to close the relay contacts. When a pair of stationary contacts flows with a large short-circuit current, the moving contact will bounce open due to the electromotive force generated by the short-circuit current. The instantaneous bounce of the moving and static contacts will cause the relay to burn or explode under the action of a strong electric arc.

[0004] In order to resist the electromotive repulsion generated by the short-circuit current, an anti-short-circuit structure is usually provided in the related art, and the anti-short-circuit structure is used to generate a suction force along the contact pressure direction on the moving contact piece, and the suction force can resist the electromotive repulsion generated by the short-circuit current between the moving contact piece and the stationary contact. However, the anti-short-circuit capability of the anti-short-circuit structure in the related art needs to be further improved. Utility Model Content

[0005] The embodiment of the present application provides a relay capable of improving short-circuit resistance.

[0006] The relay of the embodiment of the present application includes:

[0007] A pair of stationary contacts;

[0008] A moving contact piece, used for contacting with a pair of the stationary contacts;

[0009] A first magnetic conductor is arranged on a side of the moving contact piece facing the stationary contact;

[0010] a second magnetic conductor connected to the moving contact piece and disposed on a side of the moving contact piece facing away from the stationary contact; and

[0011] The third magnetic conductor is connected to the second magnetic conductor and is arranged on a side of the second magnetic conductor facing away from the static contact. The third magnetic conductor and the second magnetic conductor are used to form a magnetic circuit with the first magnetic conductor respectively.

[0012] According to some embodiments of the present application, the first magnetic conductor includes a plurality of magnetic conductive sheets, and the plurality of magnetic conductive sheets are stacked along the movement direction of the moving contact sheet.

[0013] According to some embodiments of the present application, the second magnetic conductor includes a first base and two first side portions, the first base is fixedly connected to a surface of the moving contact piece facing away from the stationary contact, the two first side portions are respectively connected to two sides of the first base along a third direction, and the two first side portions are respectively located on two sides of the moving contact piece along the third direction;

[0014] The arrangement direction of the pair of stationary contacts is defined as a first direction, the movement direction of the moving contact piece is defined as a second direction, and the third direction, the first direction, and the second direction are perpendicular to each other.

[0015] According to some embodiments of the present application, the first side portion has a first magnetic pole surface facing the first magnetic conductor, and the first magnetic pole surface is flush with a side surface of the moving contact piece facing the stationary contact.

[0016] According to some embodiments of the present application, the third magnetic conductor includes a second base and two second side portions, the second base is fixedly connected to a side surface of the first base facing away from the static contact, the two second side portions are respectively connected to both sides of the second base along the third direction, and the two second side portions are respectively arranged on both sides of the two first side portions facing away from each other along the third direction.

[0017] According to some embodiments of the present application, the second side portion has a second magnetic pole surface facing the first magnetic conductor, and the second magnetic pole surface is flush with a side surface of the moving contact piece facing the static contact.

[0018] According to some embodiments of the present application, bosses are provided on surfaces of the two second side portions facing away from each other along the third direction;

[0019] A bending portion is provided between the second side portion and the second base portion, and a through hole is provided at a position of the bending portion corresponding to the boss, and the through hole penetrates the bending portion along a thickness direction of the bending portion.

[0020] According to some embodiments of the present application, along the first direction, two ends of the second side portion extend out from two ends of the first side portion respectively.

[0021] According to some embodiments of the present application, grooves are provided on surfaces of the two second side portions facing away from each other along the third direction, and the boss is protruding from the bottom surface of the groove.

[0022] According to some embodiments of the present application, it further includes an insulating cover, and the pair of static contacts are disposed on the insulating cover;

[0023] The first magnetic conductor is arranged in the insulating cover and is fixed relative to the insulating cover.

[0024] According to some embodiments of the present application, the first magnetic conductor is connected to the insulating cover via a connector, and the connector is connected to an outer surface of the insulating cover.

[0025] One embodiment of the above application has at least the following advantages or beneficial effects:

[0026] In the relay of the embodiment of the present application, the second magnetizer is fixedly arranged on the side of the moving contact piece facing away from the static contact, and the third magnetizer is fixedly arranged on the side of the second magnetizer facing away from the static contact. The third magnetizer and the second magnetizer are used to form a magnetic circuit with the first magnetizer respectively, which increases the number of magnetizers on the side of the moving contact piece facing away from the static contact, thereby increasing the magnetic area, thereby enhancing the short-circuit resistance. In addition, the third magnetizer is arranged on the side of the second magnetizer facing away from the static contact. On the one hand, the second magnetizer and the third magnetizer are overlapped in the direction of movement of the moving contact piece, and will not occupy too much space in the first direction or the third direction; on the other hand, the magnetic field directions in the second magnetizer and the third magnetizer are the same, and the magnetic fields will not cancel each other out, thereby ensuring the magnetic field strength, thereby further enhancing the short-circuit resistance.

[0027] Furthermore, by providing a through hole at the position corresponding to the bending portion and the boss, the position corresponding to the plate and the boss is hollowed out during bending, and there is no stress pulling phenomenon, which effectively controls the dimensional accuracy of the boss after the third magnetic conductor is bent and formed, thereby ensuring the assembly accuracy of the boss and the clamping hole of the contact bracket.

[0028] Furthermore, by lengthening the second side portion, it is possible to avoid reducing the magnetic flux passing through the third magnetic conductor due to the provision of a through hole in the third magnetic conductor, thereby ensuring that the third magnetic conductor can provide sufficient suction force.

[0029] Furthermore, by protruding the boss on the bottom surface of the groove, the root of the boss is accommodated in the groove, thereby preventing burrs formed at the root from affecting the boss from being inserted into the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Shown is a cross-sectional view of a relay according to an embodiment of the present application.

[0031] Figure 2 Shown is a schematic diagram of the direction of magnetic flux lines generated by the anti-short circuit structure of an embodiment of the present application.

[0032] Figure 3 It is shown that Figure 2 Schematic diagram of the decomposition.

[0033] Figure 4 The figure shows a three-dimensional schematic diagram of the assembled moving contact piece, the second magnetic conductor and the third magnetic conductor.

[0034] The reference numerals are described as follows:

[0035] 21. Insulation cover; 212. Inner cavity; 22. Stationary contact; 24. Frame; 25. Yoke iron plate; 251. First perforation; 27. Metal cover;

[0036] 30, moving assembly; 31, moving contact piece; 32, first elastic member; 33, push rod member; 331, push rod; 332, base; 333, contact bracket; 333a, clamping hole; 333b, bottom plate; 333c, side plate;

[0037] 40, magnetic circuit part; 41, moving iron core; 42, static iron core; 421, second through hole; 43, coil frame; 44, coil; 45, magnetic tube; 46, second elastic member;

[0038] 50. Anti-short circuit structure; 51. First magnetic conductor; 511. Magnetic conductor sheet; 512. Through hole; 52. Second magnetic conductor; 521. First base; 522. First side; 522a. First magnetic pole surface; 53. Third magnetic conductor; 531. Second base; 531a. Boss; 531b. Groove; 532. Second side; 532a. Second magnetic pole surface; 533. Bend; 534. Through hole; 54. Connector; 55. Rivet;

[0039] D1, first direction; D2, second direction; D3, third direction. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0041] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or components that are inherent to these processes, methods, products, or devices.

[0042] like Figure 1 As shown, the relay of the embodiment of the present application includes an insulating cover 21 , a yoke iron plate 25 , a pair of stationary contacts 22 , a moving component 30 and a magnetic circuit portion 40 .

[0043] The insulating cover 21 has an inner cavity 212, a pair of static contacts 22 are installed on the top of the insulating cover 21, at least part of each static contact 22 extends into the inner cavity 212 of the insulating cover 21, and a static contact point is also provided at the bottom of each static contact 22, and the static contact point can be integrally or separately provided at the bottom of the static contact 22. One static contact 22 serves as a terminal for current to flow in, and the other static contact 22 serves as a terminal for current to flow out.

[0044] In the embodiment of the present application, two mounting holes are provided on the top of the insulating cover 21, and each mounting hole is connected to the inner cavity 212. A pair of static contacts 22 are respectively provided in the two mounting holes. Moreover, each static contact 22 and the insulating cover 21 can be connected by welding, but the present invention is not limited thereto.

[0045] It can be understood that the insulating cover 21 can be made of ceramic material, that is, the insulating cover 21 is a ceramic cover, but it is not limited thereto. For example, in other embodiments, the insulating cover 21 can also be made of plastic material.

[0046] In an embodiment of the present application, the insulating cover 21 is made of ceramic material, and the insulating cover 21 is connected to the yoke iron plate 25 through a frame piece 24. The frame piece 24 can be a metal piece with an annular structure, such as an iron-nickel alloy. One end of the frame piece 24 is connected to the opening edge of the insulating cover 21, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece 24 is connected to the yoke iron plate 25, which can also be done by laser welding, brazing, resistance welding, gluing, etc. A frame piece 24 is arranged between the insulating cover 21 and the yoke iron plate 25 to facilitate the connection between the insulating cover 21 and the yoke iron plate 25.

[0047] Please continue reading Figure 1 The moving assembly 30 includes a moving contact piece 31 , a first elastic member 32 and a push rod member 33 .

[0048] For the convenience of explanation, the arrangement direction of the pair of stationary contacts 22 is defined as the first direction D1, and the movement direction of the movable contact piece 31 is defined as the second direction D2, wherein the first direction D1 is perpendicular to the second direction D2. The direction perpendicular to both the first direction D1 and the second direction D2 is defined as the third direction D3.

[0049] The movable contact piece 31 is disposed in the insulating cover 21 , and two ends of the movable contact piece 31 along the first direction D1 are respectively used to contact the bottom of a pair of stationary contacts 22 .

[0050] The push rod member 33 is movably disposed in the first through hole 251 of the yoke plate 25 , and part of the push rod member 33 extends out of the side surface of the yoke plate 25 facing the stationary contact 22 , and part of the push rod member 33 extends out of the side surface of the yoke plate 25 facing away from the stationary contact 22 .

[0051] The movable contact piece 31 is movably mounted on the portion of the push rod member 33 extending from the side surface of the yoke iron plate 25 facing the stationary contact 22. The first elastic member 32 is used to apply an elastic force to the movable contact piece 31 toward the stationary contact 22 to provide contact pressure.

[0052] As an example, the first elastic member 32 is a spring or a leaf spring, but is not limited thereto. In addition, the number of the first elastic member 32 may be one or more. When the number of the first elastic member 32 is multiple, the multiple first elastic members 32 may all be springs, or all be leaf springs, or may be a combination of leaf springs and springs, and the present application does not make any special limitation on this.

[0053] The side surface of the yoke iron plate 25 facing away from the static contact 22 is also covered with a metal cover 27, and the metal cover 27 covers the first through hole 251 of the yoke iron plate 25. The push rod member 33 extending from the side surface of the yoke iron plate 25 facing away from the static contact 22 is inserted into the metal cover 27.

[0054] Please continue reading Figure 1 The magnetic circuit part 40 includes a moving iron core 41, a stationary iron core 42, a coil frame 43 and a coil 44. The coil frame 43 is in a hollow cylindrical shape and is made of insulating material. The coil frame 43 is located on the side of the yoke iron plate 25 facing away from the stationary contact 22 and surrounds the outer periphery of the metal cover 27. The coil 44 is wound around the outer periphery of the coil frame 43.

[0055] The static iron core 42 is fixedly disposed in the metal cover 27, and part of the static iron core 42 is inserted into the first through hole 251. The static iron core 42 has a second through hole 421, and the second through hole 421 corresponds to the position of the first through hole 251, so that the push rod member 33 can be movably penetrated in the first through hole 251 and the second through hole 421. The moving iron core 41 is movably disposed in the metal cover 27, and is arranged relative to the static iron core 42 in the second direction D2. The moving iron core 41 is connected to the push rod member 33, and is used to be attracted by the static iron core 42 when the coil 44 is energized. The moving iron core 41 and the push rod member 33 can be connected by screwing, riveting, welding or other methods.

[0056] like Figure 1 As shown, the magnetic circuit portion 40 further includes a second elastic member 46, which is located in the metal cover 27 and disposed between the static iron core 42 and the moving iron core 41, and is used to reset the moving iron core 41 when the coil 44 is de-energized.

[0057] In one embodiment, the second elastic member 46 is a spring and is sleeved on the outer circumference of the push rod member 33 , but the present invention is not limited thereto.

[0058] It should be noted that when the coil 44 is energized, the stationary iron core 42 attracts the moving iron core 41 to move upward, and the moving iron core 41 can drive the push rod member 33 to move upward. When the moving contact piece 31 contacts the stationary contact 22, the moving contact piece 31 is stopped by the stationary contact 22, and the push rod member 33 will continue to move upward until the overtravel is completed.

[0059] During the overtravel process, the first elastic member 32 is squeezed by the push rod member 33 and can provide elastic force to the movable contact piece 31 to provide contact point pressure.

[0060] like Figure 1 As shown, the magnetic circuit portion 40 further includes a magnetic conductive cylinder 45 , which is sleeved on the outer periphery of the metal cover 27 , and is located between the metal cover 27 and the coil frame 43 .

[0061] like Figure 2 As shown, the relay of the embodiment of the present application also includes an anti-short circuit structure 50, which is used to form a suction force on the moving contact piece 31 along the contact pressure direction, and the suction force can resist the electric repulsion between the moving contact piece 31 and the static contact 22 due to the short-circuit current, thereby preventing the moving contact piece 31 from instantly bouncing open, thereby achieving an anti-short circuit effect.

[0062] The anti-short circuit structure 50 includes a first magnetic conductor 51, a second magnetic conductor 52 and a third magnetic conductor 53. The first magnetic conductor 51 is arranged on the side of the movable contact piece 31 facing the stationary contact 22; the second magnetic conductor 52 is fixedly connected to the movable contact piece 31 and arranged on the side of the movable contact piece 31 facing away from the stationary contact 22; the third magnetic conductor 53 is fixedly connected to the second magnetic conductor 52 and arranged on the side of the second magnetic conductor 52 facing away from the stationary contact 22, and the third magnetic conductor 53 and the second magnetic conductor 52 are used to form a magnetic circuit with the first magnetic conductor 51 respectively.

[0063] like Figure 2 As shown, in the embodiment of the present application, the second magnet 52 is fixedly arranged on the side of the moving contact piece 31 facing away from the stationary contact 22, and the third magnet 53 is fixedly arranged on the side of the second magnet 52 facing away from the stationary contact 22. The third magnet 53 and the second magnet 52 are used to form a magnetic circuit with the first magnet 51 respectively, which increases the number of magnets on the side of the moving contact piece 31 facing away from the stationary contact 22, thereby increasing the magnetic area, thereby enhancing the short-circuit resistance. In addition, the third magnet 53 is arranged on the side of the second magnet 52 facing away from the stationary contact 22. On the one hand, the second magnet 52 and the third magnet 53 are overlapped in the moving direction (second direction D2) of the moving contact piece 31, and will not occupy too much space of the relay along the first direction D1 or the third direction D3; on the other hand, the magnetic field directions in the second magnet 52 and the third magnet 53 are the same, and the magnetic fields will not cancel each other, ensuring the magnetic field strength, thereby further enhancing the short-circuit resistance.

[0064] It is understandable that the first magnetic conductor 51, the second magnetic conductor 52, and the third magnetic conductor 53 can be in a straight line or a U shape, and the first magnetic conductor 51, the second magnetic conductor 52, and the third magnetic conductor 53 can be made of soft magnetic materials such as iron, cobalt, nickel, and their alloys.

[0065] In one embodiment, the first magnetic conductor 51 includes a plurality of magnetic conductors 511, and the plurality of magnetic conductors 511 are stacked along the moving direction (second direction D2) of the movable contact piece 31. It can be understood that by increasing the number of thinner magnetic conductors 511, the overall thickness of the first magnetic conductor 51 can be increased. On the one hand, the magnetic conductors 511 are thin and can be made of thin strips, so the material cost is low and easy to operate; on the other hand, the number of magnetic conductors 511 can be flexibly adjusted according to the size of the short-circuit current.

[0066] like Figures 2 to 4 As shown, the second magnetic conductor 52 includes a first base portion 521 and two first side portions 522. The first base portion 521 is fixedly connected to a side surface of the movable contact piece 31 facing away from the stationary contact 22. The two first side portions 522 are respectively connected to two sides of the first base portion 521 along the third direction D3, and the two first side portions 522 are respectively located on two sides of the movable contact piece 31 along the third direction D3. In other words, the second magnetic conductor 52 is generally in a U-shaped structure.

[0067] It is understandable that by designing the second magnetic conductor 52 as a U-shaped structure, the distance between the magnetic pole surface of the second magnetic conductor 52 and the first magnetic conductor 51 is closer, so as to further increase the attraction between the first magnetic conductor 51 and the second magnetic conductor 52 and enhance the short-circuit resistance.

[0068] The first side portion 522 has a first magnetic pole surface 522a facing the first magnetic conductor 51, and the first magnetic pole surface 522a is flush with the surface of the movable contact piece 31 facing the stationary contact 22. The first magnetic pole surface 522a of the first side portion 522 is flush with the surface of the movable contact piece 31 facing the stationary contact 22, which not only reduces the distance between the first magnetic pole surface 522a and the first magnetic conductor 51, but also prevents the first side portion 522 from interfering with the contact between the movable contact piece 31 and the stationary contact 22.

[0069] Please continue reading Figures 2 to 4 The third magnetic conductor 53 includes a second base 531 and two second side portions 532. The second base 531 is fixedly connected to a side surface of the first base 521 facing away from the stationary contact 22. The two second side portions 532 are respectively connected to two sides of the second base 531 along the third direction D3, and the two second side portions 532 are respectively arranged on two sides of the two first side portions 522 facing away from each other along the third direction D3. In other words, the third magnetic conductor 53 is generally in a U-shaped structure.

[0070] By designing the third magnetizer 53 as a U-shaped structure, the distance between the magnetic pole surface of the third magnetizer 53 and the first magnetizer 51 is made closer, so as to further increase the attraction between the first magnetizer 51 and the third magnetizer 53 and enhance the short circuit resistance.

[0071] The second side portion 532 has a second magnetic pole surface 532a facing the first magnet 51, and the second magnetic pole surface 532a is flush with the surface of the moving contact piece 31 facing the stationary contact 22, which not only reduces the distance between the second magnetic pole surface 532a and the first magnet 51, but also prevents the second side portion 532 from interfering with the contact between the moving contact piece 31 and the stationary contact 22.

[0072] As can be seen from the above, the first magnetic pole surface 522a of the second magnet 52, the second magnetic pole surface 532a of the third magnet 53, and the surface of the side of the moving contact piece 31 facing the static contact 22 are flush, so that under the premise that the second magnet 52 and the third magnet 53 will not interfere with the contact between the moving contact piece 31 and the static contact 22, the distance between the first magnetic pole surface 522a, the second magnetic pole surface 532a and the first magnet 51 is reduced, thereby increasing the suction force between the first magnet 51 and the second magnet 52, and the first magnet 51 and the third magnet 53, thereby enhancing the short-circuit resistance.

[0073] like Figure 3 As shown, the push rod component 33 includes a push rod 331, a base 332 and a contact bracket 333. The push rod 331 is movably arranged in the first through hole 251 of the yoke iron plate 25 and the second through hole 421 of the static iron core 42. One axial end of the push rod 331 is connected to the moving iron core 4141, and the other axial end of the push rod 331 is provided with a base 332. The contact bracket 333 is connected to the base 332. The first elastic member 32 is arranged between the base 332 and the third magnetic conductor 53. In the embodiment of the present application, one end of the first elastic member 32 abuts against the base 332, and the other end of the first elastic member 32 abuts against the second base 531.

[0074] In one embodiment, the push rod 331, the base 332 and the contact bracket 333 are integrally formed. Further, the push rod 331, the base 332 and the contact bracket 333 are integrally formed by injection molding.

[0075] like Figure 1 and Figure 3 As shown, the contact support 333 has a bottom plate 333b and two side plates 333c, the bottom plate 333b is connected to the base 332, and one end of the two side plates 333c is respectively connected to the two sides of the bottom plate 333b along the third direction D3. Each side plate 333c has a clamping hole 333a.

[0076] like Figure 3 and Figure 4As shown, the two second side portions 532 of the third magnetic conductor 53 are provided with bosses 531a on their surfaces facing away from each other along the third direction D3, and the two bosses 531a are respectively inserted into the two holes 333a, so that the component composed of the movable contact piece 31, the second magnetic conductor 52 and the third magnetic conductor 53 can be movably installed on the contact bracket 333 along the second direction D2.

[0077] In one embodiment, the boss 531 a is formed on the second side portion 532 of the third magnetic conductor 53 by a stamping process, but the present invention is not limited thereto.

[0078] A bending portion 533 is disposed between the second side portion 532 and the second base portion 531 . A through hole 534 is disposed at a position of the bending portion 533 corresponding to the boss 531 a . The through hole 534 penetrates the bending portion 533 along a thickness direction of the bending portion 533 .

[0079] It should be noted that the third magnetic conductor 53 is formed by bending. Specifically, the boss 531a is first stamped on the plate, and then the plate is bent to form the second base 531, two second side portions 532 and two bent portions 533. Since the boss 531a has been formed before the bending process, the boss 531a may be pulled by the internal stress of the plate during bending, affecting the dimensional accuracy of the boss 531a.

[0080] In the embodiment of the present application, a through hole 534 is provided at a position corresponding to the bending portion 533 and the boss 531a, so that when bending, the position corresponding to the plate and the boss 531a is hollowed out, and there is no stress pulling phenomenon, thereby effectively controlling the dimensional accuracy of the boss 531a after the third magnetic conductor 53 is bent and formed, thereby ensuring the assembly accuracy of the boss 531a and the clamping hole 333a of the contact bracket 333.

[0081] Please continue reading Figure 4 , further, along the first direction D1, the two ends of the second side portion 532 extend out of the two ends of the first side portion 522. In other words, in the first direction D1, the length of the second side portion 532 is greater than the length of the first side portion 522. In the embodiment of the present application, by lengthening the second side portion 532, it is possible to avoid reducing the magnetic flux passing through the third magnetic conductor 53 due to the through hole provided in the third magnetic conductor 53, thereby ensuring that the third magnetic conductor 53 can provide sufficient suction force.

[0082] like Figure 4As shown, the surfaces of the two second side portions 532 facing away from each other along the third direction D3 are provided with grooves 531b, and the boss 531a is convexly arranged on the bottom surface of the groove 531b. By convexly arranging the boss 531a on the bottom surface of the groove 531b, the root of the boss 531a is accommodated in the groove 531b, so as to avoid the burr formed at the root of the boss 531a during the stamping process affecting the boss 531a from being inserted into the clamping hole 333a, and also avoid the motion interference with the contact bracket 333 of the push rod member 33 during the overtravel process.

[0083] like Figures 1 to 3 As shown, the first magnetic conductor 51 is fixedly arranged relative to the insulating cover 21. Since the first magnetic conductor 51 is fixedly arranged relative to the insulating cover 21, the requirement for the coil holding force can be reduced, thereby reducing the power consumption of the coil of the relay and the volume of the relay.

[0084] In one embodiment, the first magnetic conductor 51 is connected to the insulating cover 21 via a connector 54. In this way, the suction force of the anti-short circuit structure 50 is transferred to the insulating cover 21. Since the insulating cover 21 is a stationary component, there is no need for excessive coil holding force.

[0085] The insulating cover 21 may be provided with a through hole, which is connected to the inner cavity 212. The connecting member 54 is rod-shaped and passes through the through hole; one axial end of the connecting member 54 is connected to the insulating cover 21, and the other end is connected to the first magnetic conductor 51.

[0086] The connection between one axial end of the connector 54 and the insulating cover 21 can be implemented in various ways, such as welding, riveting, screwing, bonding, etc. The connection between the other end of the connector 54 and the first magnetic conductor 51 can also be implemented in various ways, such as welding, riveting, screwing, bonding, clamping, etc.

[0087] It can be understood that when one end of the connector 54 is connected to the insulating cover 21 by welding, by welding the connector 54 to the top wall of the insulating cover 21, the metallization layer can be processed only on the periphery of the through hole on the outer wall surface of the top wall, without the need to process the metallization layer on the inner wall surface of the top wall, which facilitates processing and simplifies the processing steps.

[0088] It is understandable that one axial end of the connector 54 may be connected to the outer wall surface of the insulating cover 21 , may be connected to the inner wall surface of the insulating cover 21 , or may be connected to both the outer wall surface and the inner wall surface of the insulating cover 21 .

[0089] It can be seen from this that the first magnetic conductor 51 is connected to the insulating cover 21 through the connecting piece 54. On the one hand, the anti-short circuit suction force is transferred to the insulating cover 21, so there is no need for excessive coil holding force, thereby reducing the power consumption of the coil of the relay and the volume of the relay, and improving the short circuit resistance; on the other hand, since the connecting piece 54 is connected to the insulating cover 21, it will not occupy too much space in the inner cavity 212 of the insulating cover 21, thereby ensuring the arc extinguishing space of the arc extinguishing assembly and the activity space of the push rod member 33.

[0090] In addition, the first magnetic conductor 51 is connected to the rod-shaped connecting member 54, so that a variety of connection methods can be used between the first magnetic conductor 51 and the connecting member 54, such as riveting, laser welding, clamping, gluing, etc., which enriches the connection methods.

[0091] As an example, the connecting member 54 is a solid rod. In this way, the connecting member 54 and the first magnetic conductor 51 can be connected by riveting, making the connection more reliable. In addition, the solid rod has a higher support strength and is less prone to deformation.

[0092] like Figure 2 and Figure 3 As shown, when the first magnetic conductive body 51 includes multiple stacked magnetic conductive sheets 511, each magnetic conductive sheet 511 is provided with a through hole 512, and the through holes 512 on the multiple magnetic conductive sheets 511 are aligned in the second direction D2. The connecting member 54 is inserted through the multiple through holes 512 of the multiple magnetic conductive sheets 511, and the other axial end of the connecting member 54 is riveted to the magnetic conductive sheet 511 close to the movable contact sheet 31 among the multiple magnetic conductive sheets 511.

[0093] Of course, the first magnetic conductor 51 can also be fixedly arranged relative to the insulating cover 21 in the following manner: the first magnetic conductor 51 is fixedly arranged in the insulating cover 21 through a fixing bracket (not shown in the figure). Specifically, the fixing bracket is arranged in the insulating cover 21 and is fixedly connected to the yoke iron plate 25, and the first magnetic conductor 51 is fixedly connected to the fixing bracket.

[0094] In addition, in another embodiment, the first magnetic conductor 51 may also be disposed on the push rod member 33 to form a follow-up anti-short circuit structure 50 .

[0095] In another embodiment, the distance between the first magnet 51 and the second magnet 52 and the third magnet 53 can be designed to be variable. Specifically, the distance between the first magnet 51 and the second magnet 52 and the third magnet 53 can be adjusted according to the current value, thereby changing the suction force generated between the first magnet 51 and the second magnet 52 and the third magnet 53, so as to meet the requirements of short circuit resistance and overload disconnection.

[0096] like Figure 3As shown, the movable contact piece 31, the second magnetic conductor 52 and the third magnetic conductor 53 can be connected by rivets 55, but this is not limited to this. For example, they can also be connected by welding, bonding, etc., which is not limited in the present application.

[0097] In summary, the relay of the embodiment of the present application has at least the following advantages and beneficial effects:

[0098] In the relay of the embodiment of the present application, the second magnetizer 52 is fixedly arranged on the side of the moving contact piece 31 facing away from the stationary contact 22, and the third magnetizer 53 is fixedly arranged on the side of the second magnetizer 52 facing away from the stationary contact 22. The third magnetizer 53 and the second magnetizer 52 are used to form a magnetic circuit with the first magnetizer 51 respectively, which increases the number of magnetizers on the side of the moving contact piece 31 facing away from the stationary contact 22, thereby increasing the magnetic area, thereby enhancing the short-circuit resistance. In addition, the third magnetizer 53 is arranged on the side of the second magnetizer 52 facing away from the stationary contact 22. On the one hand, the second magnetizer 52 and the third magnetizer 53 are overlapped in the moving direction of the moving contact piece 31, and will not occupy too much space in the first direction D1 or the third direction D3; on the other hand, the magnetic field directions in the second magnetizer 52 and the third magnetizer 53 are the same, and the magnetic fields will not cancel each other, thereby ensuring the magnetic field strength, thereby further enhancing the short-circuit resistance.

[0099] Furthermore, by providing a through hole 534 at the position corresponding to the bending portion 533 and the boss 531a, when bending, the position corresponding to the plate and the boss 531a is hollowed out, and there is no stress pulling phenomenon, which effectively controls the dimensional accuracy of the boss 531a after the third magnetic conductor 53 is bent and formed, thereby ensuring the assembly accuracy of the boss 531a and the clamping hole 333a of the contact bracket 333.

[0100] Furthermore, by lengthening the second side portion 532 , it is possible to avoid reducing the magnetic flux passing through the third magnetic conductor 53 due to the through hole provided in the third magnetic conductor 53 , thereby ensuring that the third magnetic conductor 53 can provide sufficient suction force.

[0101] Furthermore, by protruding the boss 531a from the bottom surface of the groove 531b, the root of the boss 531a is accommodated in the groove 531b, thereby preventing the burrs formed at the root from affecting the boss 531a from being inserted into the hole 333a.

[0102] It is understandable that the various embodiments / implementations provided in the present application can be combined with each other without causing any contradiction, and will not be illustrated one by one here.

[0103] In the application embodiments, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0104] In the description of the application embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the application embodiments and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the application embodiments.

[0105] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0106] The above are only preferred embodiments of the application embodiments and are not intended to limit the application embodiments. For those skilled in the art, the application embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. A relay, characterized in that: include: A pair of stationary contacts; A moving contact piece, used for contacting with a pair of the stationary contacts; A first magnetic conductor is arranged on a side of the moving contact piece facing the stationary contact; A second magnetic conductor is connected to the moving contact piece and is disposed on a side of the moving contact piece facing away from the stationary contact; as well as The third magnetic conductor is connected to the second magnetic conductor and is arranged on a side of the second magnetic conductor facing away from the static contact. The third magnetic conductor and the second magnetic conductor are used to form a magnetic circuit with the first magnetic conductor respectively.

2. The relay according to claim 1, characterized in that: The first magnetic conductor includes a plurality of magnetic conductive sheets, and the plurality of magnetic conductive sheets are stacked along the moving direction of the moving contact sheet.

3. The relay according to claim 1 or 2, characterized in that: The second magnetic conductor includes a first base and two first side portions, the first base is fixedly connected to a surface of the movable contact piece facing away from the stationary contact, the two first side portions are respectively connected to two sides of the first base along a third direction, and the two first side portions are respectively located on two sides of the movable contact piece along the third direction; The arrangement direction of the pair of stationary contacts is defined as a first direction, the movement direction of the moving contact piece is defined as a second direction, and the third direction, the first direction, and the second direction are perpendicular to each other.

4. The relay according to claim 3, characterized in that: The first side portion has a first magnetic pole surface facing the first magnetic conductor, and the first magnetic pole surface is flush with a surface of the moving contact piece facing the stationary contact.

5. The relay according to claim 3, characterized in that: The third magnetic conductor includes a second base and two second side portions, the second base is fixedly connected to a side surface of the first base facing away from the static contact, the two second side portions are respectively connected to both sides of the second base along the third direction, and the two second side portions are respectively arranged on both sides of the two first side portions facing away from each other along the third direction.

6. The relay according to claim 5, characterized in that: The second side portion has a second magnetic pole surface facing the first magnetic conductor, and the second magnetic pole surface is flush with a surface of the moving contact piece facing the stationary contact.

7. The relay according to claim 5, characterized in that: Bosses are provided on surfaces of the two second side portions facing away from each other along the third direction; A bending portion is provided between the second side portion and the second base portion, and a through hole is provided at a position of the bending portion corresponding to the boss, and the through hole penetrates the bending portion along a thickness direction of the bending portion.

8. The relay according to claim 7, characterized in that: Along the first direction, two ends of the second side portion extend out from two ends of the first side portion respectively.

9. The relay according to claim 7, characterized in that: Grooves are provided on surfaces of the two second side portions facing away from each other along the third direction, and the boss is protruding from the bottom surface of the groove.

10. The relay according to claim 1, characterized in that: It also includes an insulating cover, and a pair of static contacts are arranged on the insulating cover; The first magnetic conductor is arranged in the insulating cover and is fixed relative to the insulating cover.

11. The relay according to claim 10, characterized in that: The first magnetic conductor is connected to the insulating cover through a connecting piece, and the connecting piece is connected to the outer surface of the insulating cover.

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