Magnetic latching relay resistant to electric repulsive force

Abstract

A magnetic latching relay resistant to electric repulsive force comprises a sliding frame, a movable reed assembly and a static reed assembly. The sliding frame comprises a frame body, a mounting hole and an abutting groove. The movable contact spring assembly comprises a magnetized iron sheet, a connecting plate, a movable contact, a magnetized column, an elastic sheet, an elastic piece and an iron block. The elastic piece comprises an elastic piece body, an abutting part and a blocking piece. The static reed assembly comprises a static reed and a static contact. The second compression elastic piece and the elastic piece are arranged in the movable contact spring assembly, so that enough thrust is provided for the movable contact and the static contact to overcome the repulsive force between the movable contact and the static contact. And a magnetized column is arranged on the magnetized iron sheet. And meanwhile, an iron block is arranged between the two static reeds, and the magnetic attraction force on the magnetized column can be attracted to the iron block, so that the movable contact and the static contact are virtually connected, and the electrical connection stability of the magnetic latching relay is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a magnetic latching relay with anti-electric repulsive force. Background Art

[0002] A magnetic latching relay is an electronic component that uses electromagnetic principles to achieve the on-off of contacts. Its core feature is that it can maintain the on-off state of the contacts even after power-off, mainly due to the permanent magnet set inside. However, when the magnetic latching relay is powered on, repulsive force will be generated between the contacts, which not only affects the stability of the contacts, but also causes contact loss due to the existence of arcs when the contacts are turned on and off, thus shortening the service life of the relay.

[0003] In Chinese Patent CN202021240529.8, a relay is disclosed. A first armature and a second armature are arranged on the upper and lower sides of the moving contact plate, and an insulating layer is arranged between the moving contact plate and the first armature. When the moving contact plate conducts at least two static contacts, the first armature and the second armature generate magnetic suction force to push the static contacts against the moving contact plate, and an insulating layer is arranged between the first armature and the moving contact plate to avoid the magnetic field generated by overcurrent on the first armature from reducing the magnetic concentration effect, further improving the stability of the contact between the moving contact plate and the static contacts and enhancing the tolerance of the relay to excessive current.

[0004] The above solution solves the problem of arc generation when the contacts are turned on and off by setting an insulating layer, but does not solve the problem of unstable contact between the contacts caused by the repulsive force generated between the contacts when they are in contact. Summary of the Utility Model

[0005] In view of this, the utility model provides a magnetic latching relay with anti-electric repulsive force to solve the above technical problems.

[0006] A magnetic latching relay resistant to electric repulsive force, which comprises a housing, a sliding frame disposed in the housing, two sets of moving reed assemblies disposed in the sliding frame, and a set of static reed assemblies disposed in the housing corresponding to the moving reed assemblies. The housing includes a base and a cover plate covering the base. The sliding frame includes a frame body, two mounting holes spaced apart in the frame body, and at least one abutting groove disposed on an end face of the frame body away from the mounting holes. A first compression elastic member is embedded in the abutting groove, and the other end of the first compression elastic member abuts against the inner side wall of the base. Each moving reed assembly includes a magnetized iron sheet, a connecting plate embedded in the magnetized iron sheet, two moving contacts respectively disposed at two ends of the connecting plate, a magnetization column penetrating through a middle region of the connecting plate, a elastic sheet disposed on an end face of the magnetized iron sheet facing away from the connecting plate, a second compression elastic member with two ends respectively abutting against the mounting hole and the elastic sheet, and an iron block disposed on a side wall of the base corresponding to the magnetization column. The elastic sheet includes an elastic sheet body, two abutting portions disposed at two ends of the elastic sheet body, and two pairs of retaining pieces disposed on two side edges of the elastic sheet body. The static reed assembly includes two static reeds embedded in the base, and two pairs of static contacts respectively disposed on the two static reeds. When energized, the magnetization column generates a magnetic force under the action of the current and attracts the opposite iron block, so that the moving contact has a tendency to move towards the static reed assembly.

[0007] Further, a coil assembly and a magnet assembly are sequentially disposed along one end of the base.

[0008] Further, the magnet assembly includes a permanent magnet rotatably disposed in the base, two yokes disposed on two sides of the permanent magnet, and a swing head disposed on an end face of the permanent magnet facing the sliding frame.

[0009] Further, the frame body is slidably disposed in the housing.

[0010] Further, avoiding grooves are provided in middle regions of two side edges of the magnetized iron sheet.

[0011] Further, the abutting portions disposed at two ends of the elastic sheet body are inclined towards the magnetized iron sheet.

[0012] Further, regions where the two abutting portions abut against the magnetized iron sheet are corresponding to positions of the moving contacts.

[0013] Further, the spacing distance between the two retaining pieces is equivalent to the width of the frame body.

[0014] Compared with the prior art, the magnetic latching relay with anti-electric repulsive force provided by the present utility model provides sufficient thrust for the moving contact and the static contact to overcome the repulsive force between the moving contact and the static contact by arranging the second compression elastic member and the elastic sheet in the moving reed assembly. However, in order to overcome the change in repulsive force caused by current fluctuation or unexpected working conditions, it is necessary to provide a certain amount of supplementary thrust. Therefore, at least one magnetization column is arranged on the magnetization iron sheet, and when energized, the magnetization column is magnetized to generate magnetic suction force. At the same time, an iron block is arranged between the two static reeds, and the magnetic suction force on the magnetization column will attract the iron block, thereby providing a certain amount of supplementary suction force for the moving reed assembly and the static reed assembly, preventing the moving contact and the static contact from being in virtual contact under the action of the repulsive force and in some unexpected situations, and ensuring the electrical connection stability of the magnetic latching relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic structural diagram of a magnetic latching relay with anti-electric repulsive force provided by the present utility model.

[0016] Figure 2 is Figure 1 a schematic structural diagram of the assembled moving reed assembly and the sliding frame of the magnetic latching relay with anti-electric repulsive force.

[0017] Figure 3 is Figure 1 a schematic structural diagram of the frame of the magnetic latching relay with anti-electric repulsive force.

[0018] Figure 4 is Figure 1 a schematic structural diagram of the moving reed assembly of the magnetic latching relay with anti-electric repulsive force. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further details the specific embodiments of the present utility model. It should be understood that the description of the embodiments of the present utility model herein does not limit the protection scope of the present utility model.

[0020] As Figures 1 to 4 shown, it is a schematic structural diagram of a magnetic latching relay with anti-electric repulsive force provided by the present utility model. The novel moving reed assembly of the magnetic latching relay includes a housing 10, a sliding frame 20 arranged in the housing 10, two groups of moving reed assemblies 30 arranged in the sliding frame 10, and a group of static reed assemblies 40 arranged in the housing 10 and corresponding to the moving reed assemblies 30. It can be imagined that the novel moving reed assembly of the magnetic latching relay also includes some other functional structures, such as coil assemblies, magnet assemblies, etc., which are well-known technologies to those skilled in the art and will not be elaborated herein.

[0021] The housing 10 includes a base 11 and a cover plate 12 covering the base 11. The base 11 is sequentially provided with a coil assembly 13 and a magnet assembly 14 along one end.

[0022] After the coil assembly 13 is energized, positive and negative magnetic fields can be generated at its two end parts respectively, which interact with the magnet assembly 14, that is, attract or repel, so that the magnet assembly 14 makes a reciprocating rotation. The magnet assembly 14 is connected to the sliding frame 20. The magnet assembly 14 includes a permanent magnet 141 rotatably arranged in the base 11, two yokes 142 arranged on both sides of the permanent magnet 141, and a swing head 143 arranged on the end face of the permanent magnet 141 facing the sliding frame 20. In the natural state, the permanent magnet 141 adsorbs to one side of the yoke 142 and maintains a fixed angle. When the coil assembly 13 is energized, positive and negative magnetic fields will be generated at both ends of the coil assembly 13 itself, which interact with the magnetic field of the permanent magnet 141 itself, causing the permanent magnet 141 to swing, so as to adsorb and fix to the other side of the yoke 142, and the angle can be maintained by means of the magnetism of the permanent magnet 141 itself after power-off. The swing head 143 is connected to the sliding frame 20, so as to pull the sliding frame 20 when the permanent magnet 141 swings.

[0023] The sliding frame 20 includes a frame body 21, two mounting holes 22 spaced in the frame body 21, and at least one abutting groove 23 arranged on the end face of the frame body 21 away from the mounting holes 22.

[0024] The frame body 21 is slidably arranged in the housing 10. The mounting holes 22 are used to arrange the moving reed assembly 30. A first compression elastic member 24 is embedded in the abutting groove 23, and the other end of the first compression elastic member 24 abuts against the inner side wall of the base 11. The first compression elastic member 24 pushes the frame body 21 towards the static reed assembly 40.

[0025] Each moving reed assembly 30 includes a magnetized iron sheet 31 inserted into the mounting hole 22, a connecting plate 32 embedded in the magnetized iron sheet 31, two moving contacts 33 respectively arranged at both ends of the connecting plate 32, a magnetized column 34 penetrating through the middle area of the connecting plate 32, a spring piece 35 arranged on the end face of the magnetized iron sheet 31 facing away from the connecting plate 32, and both ends of one Mounting hole 22 and the spring piece 35 abuts against the second compression elastic member 36, and an iron block 37 arranged on the side wall of the base 11 and opposite to the magnetized column 34.

[0026] The cross-section of the magnetized iron sheet 31 is concave. Avoidance grooves 311 are provided in the middle areas of both sides of the magnetized iron sheet 31. This allows the width of the remaining portion of the magnetized iron sheet 31 to be greater than the width of the mounting hole 22 after the magnetized iron sheet 31 is inserted into the mounting hole 22, thereby increasing the area of the magnetized iron sheet 31 and improving the heat dissipation effect.

[0027] The connecting plate 32 is used to connect the two moving contacts 33 into one body, so that a passage is formed between the two moving contacts 33 .

[0028] The magnetized column 34 is made of a magnetizable material. When energized, the current generates a magnetic force on the magnetized column 34, attracting the opposing iron block 37. The distance between the magnetized column 34 and the iron block 37 is greater than the distance between the movable contact 33 and the iron block 37, providing a magnetic force that tends to move the movable contact 33 toward the stationary reed assembly 40. Even when the movable contact 33 and the stationary reed assembly 40 are in full contact, a gap remains between the magnetized column 34 and the iron block 37.

[0029] See also Figure 3 The spring piece 35 includes a spring piece body 351 , two abutting tops 352 arranged at both ends of the spring piece body 351 , and two pairs of blocking pieces 353 arranged on both sides of the spring piece body 351 .

[0030] The spring sheet body 351 contacts one end of the second compression elastic member 36, thereby pushing the spring sheet 35 toward the magnetized iron sheet 31. The abutting portions 352 at both ends of the spring sheet body 351 are inclined toward the magnetized iron sheet 31, thereby imparting a certain elastic force to the spring sheet 35. When the spring sheet 35 contacts the magnetized iron sheet 31, only two of the abutting portions 352 contact the magnetized iron sheet 31, and the areas where the two abutting portions 352 contact the magnetized iron sheet 31 are located corresponding to the positions of the moving contacts 33, thereby providing a resisting force to the magnetized iron sheet 31 and preventing the repulsive force generated when the moving spring assembly 30 contacts the static spring assembly 40, causing the moving spring assembly 30 and the static spring assembly 40 to be in virtual contact.

[0031] The distance between the two blocking pieces 353 is equivalent to the width of the frame body 21 , so that the blocking pieces 353 can only be displaced along the length direction of the frame body 21 to ensure the blocking effect.

[0032] The second compression elastic member 36 is a spring or elastic column or other existing items on the market, and is used to provide thrust for the elastic sheet body 351 .

[0033] The static reed assembly 40 includes two static reeds 41 embedded in the base 11, and two pairs of static contacts 42 respectively disposed on the two static reeds 41. Each of the static contacts 42 corresponds to one of the moving contacts 33.

[0034] The magnetization column 34 is disposed between the two static reeds 41. Preferably, the magnetization column 34 is disposed on the perpendicular bisector of the two static reeds 41 so that the two moving contacts 33 obtain substantially the same pulling force.

[0035] When powered on, the sliding frame 20 moves towards the static reed assembly 40 under the drive of the magnet assembly 14 until the moving contact 33 contacts the static contact 42. In the powered-on state, based on the left-hand rule, a repulsive force is generated between the moving contact 33 and the static contact 42. This repulsive force pushes the moving reed assembly 30 away from the static reed assembly 40. At this time, the elastic member 36 pushes the moving reed assembly 30 on the magnetized iron sheet 31 towards the static reed assembly 40 under the action of the elastic force, thereby offsetting part of the repulsive force. At the same time, the elastic sheet 35 can also provide a certain thrust, thereby offsetting part of the repulsive force. Generally, by designing the strength of the second compression elastic member 36, that is, by designing the elastic force that the second compression elastic member 36 can provide and with the assistance of the elastic sheet 35, all the repulsive forces can be offset. However, the current applied to the moving reed assembly 30 and the static reed assembly 40 is not always constant and will fluctuate to some extent. Therefore, the repulsive force also fluctuates, that is, it may be larger or smaller. In addition, during the use of this magnetic latching relay, there may be different working conditions, such as bumping, vibration, etc., which will also cause a tendency for the moving reed assembly 30 and the static reed assembly 40 to become disengaged. Therefore, it is necessary to design the magnetization column 34 and the iron block 37 to provide a certain supplementary suction force. Specifically, after the magnetized iron sheet 31 is powered on, it will generate a magnetic field and be magnetized under the action of the current. At the same time, the magnetization column 34 is also magnetized, thereby generating a certain magnetic suction force. Therefore, the magnetic suction force on the magnetization column 34 attracts the iron block 37, thereby providing a certain supplementary suction force for the moving reed assembly 30 and the static reed assembly 40 to prevent the moving contact 33 and the static contact 42 from having a virtual contact under the action of the repulsive force and in some unexpected situations.

[0036] Compared with the prior art, the magnetic latching relay with anti-electric repulsive force provided by the present utility model provides sufficient thrust for the moving contact 33 and the static contact 42 to overcome the repulsive force between the moving contact 33 and the static contact 42 by arranging the second compression elastic member 36 and the elastic sheet 35 in the moving reed assembly 40. However, in order to overcome the change in repulsive force caused by current fluctuation or unexpected working conditions, it is necessary to provide a certain amount of supplementary thrust. Therefore, at least one magnetization column 34 is arranged on the magnetization iron sheet 31, and when energized, the magnetization column 34 is magnetized to generate magnetic suction force. At the same time, an iron block 37 is arranged between the two static reeds 41, and the magnetic suction force on the magnetization column 34 will attract the iron block 37, thereby providing a certain amount of supplementary suction force for the moving reed assembly 30 and the static reed assembly 40, preventing the moving contact 33 and the static contact 42 from being in virtual contact under the action of the repulsive force and in some unexpected situations, and ensuring the electrical connection stability of the magnetic latching relay.

[0037] The above is only the preferred embodiment of the present utility model and is not used to limit the protection scope of the present utility model. Any modification, equivalent replacement or improvement within the spirit of the present utility model is covered by the claims of the present utility model.

Claims

1. A magnetic latching relay resistant to electric repulsive force, characterized in that: The magnetic latching relay against electric repulsive force includes a housing, a sliding frame disposed in the housing, two sets of moving reed assemblies disposed in the sliding frame, and a set of stationary reed assemblies disposed in the housing corresponding to the moving reed assemblies. The housing includes a base and a cover plate covering the base. The sliding frame includes a frame body, two mounting holes spaced apart in the frame body, and at least one abutting groove disposed on an end face of the frame body away from the mounting holes. A first compression elastic member is embedded in the abutting groove, and the other end of the first compression elastic member abuts against the inner side wall of the base. Each moving reed assembly includes a magnetized iron sheet, a connecting plate embedded in the magnetized iron sheet, two moving contacts respectively disposed at two ends of the connecting plate, a magnetization column penetrating through a middle region of the connecting plate, a spring piece disposed on an end face of the magnetized iron sheet facing away from the connecting plate, a second compression elastic member having two ends respectively abutting against the mounting hole and the spring piece, and an iron block disposed on a side wall of the base corresponding to the magnetization column. The spring piece includes a spring piece body, two abutting portions disposed at two ends of the spring piece body, and two pairs of blocking pieces disposed on two side edges of the spring piece body. The stationary reed assembly includes two stationary reeds embedded in the base and two pairs of stationary contacts respectively disposed on the two stationary reeds. When energized, the magnetization column generates a magnetic force under the action of the current and attracts the opposite iron block, so that the moving contact has a tendency to move towards the stationary reed assembly.

2. The magnetic latching relay with anti-electrostatic repulsion force according to claim 1, characterized in that: The base is sequentially provided with a coil assembly and a magnet assembly along one end.

3. The magnetic latching relay with anti-electrostatic repulsion force according to claim 2, wherein: The magnet assembly includes a permanent magnet rotatably disposed in the base, two yokes disposed on two sides of the permanent magnet, and a swing head disposed on an end face of the permanent magnet facing the sliding frame.

4. The magnetic latching relay with anti-electrostatic repulsion force according to claim 1, characterized in that: The frame body is slidably disposed in the housing.

5. The magnetic latching relay with anti-electrostatic repulsion force according to claim 1, wherein: Avoidance grooves are provided in middle regions of two side edges of the magnetized iron sheet.

6. The magnetic latching relay with anti-electrostatic repulsion according to claim 1, characterized in that: The abutting portions disposed at two ends of the spring piece body are inclined towards the magnetized iron sheet.

7. The magnetic latching relay with anti-electrostatic repulsion according to claim 1, characterized in that: The regions where the two abutting portions abut against the magnetized iron sheet are corresponding to the positions of the moving contacts.

8. The magnetic latching relay with anti-electrostatic repulsion force according to claim 1, wherein: The spacing distance between the two blocking pieces is equivalent to the width of the frame body.

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