Magnetic latching relay

Abstract

The invention relates to a magnetic latching relay which comprises a relay base, an electromagnetic coil assembly is arranged in the relay base, an armature assembly is arranged in the relay base on one side of the electromagnetic coil assembly, and the armature assembly is pivoted in the relay base. One side, far away from the electromagnetic coil assembly, of the armature assembly is provided with a driving arm, the driving arm comprises a first driving force arm and a second driving force arm, one side, far away from the armature assembly, of the driving arm is provided with a movable contact plate, and the movable contact plate is pivoted in the relay base; the end, close to the first driving force arm, of the movable contact plate is provided with a movable contact, and the length of a force arm from the movable contact to the pivot joint center of the movable contact plate is larger than the length of a force arm from the contact position of the second driving force arm and the movable contact plate to the pivot joint center of the movable contact plate. A conducting strip is arranged in the relay base on one side, close to the armature assembly, of the movable contact plate, and the conducting strip is connected with the movable contact plate through a flexible conducting piece.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a magnetic latching 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] As the application scope of relays continues to expand, relays are gradually developing towards high load and miniaturization. Among them, the demand for high load requires that relays should have large contact gap and low contact resistance.

[0004] In order to comply with the State Grid's new standard that the disconnection distance between the moving and static contacts must be greater than 5.5m, it is necessary to increase the magnetic field strength of the magnetic circuit and increase the power consumption. In particular, the magnetic circuit composed of the armature assembly also needs to increase the rotation angle of the armature assembly by several times. This will increase the magnetic spacing between the armature assembly and the coil assembly, and make it more difficult to attract. In order to ensure that the armature assembly can still be attracted normally when the magnetic spacing increases, it is also necessary to increase the magnetic force of the coil in the magnetic circuit and the magnetic force of the magnet in the armature assembly. This will increase the volume of the coil in the magnetic circuit and the volume of the armature assembly, and is not conducive to achieving miniaturized design.

[0005] At the same time, since it is necessary to ensure that the contact resistance of the relay is in a small state during operation, under the existing contact bearing structure, when the contact surface is burned by the arc, the stability of the contact resistance cannot be effectively guaranteed. It is necessary to consider how to prevent the contacts from being burned during operation and reduce the impact of the arc, and on this basis, carry out relay development work. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects in the prior art and provide a magnetic latching relay.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is to design a magnetic latching relay, including a relay base and a snap-fitted upper cover, an electromagnetic coil assembly is provided in the relay base, an armature assembly is provided in the relay base on one side of the electromagnetic coil assembly, the armature assembly is pivotally connected in the relay base, a driving arm is provided on the side of the armature assembly away from the electromagnetic coil assembly, the driving arm includes a first driving force arm and a second driving force arm, a moving touch plate is provided on the side of the driving arm away from the armature assembly, the moving touch plate is pivotally connected in the relay base, the first driving force arm contacts or separates with the end of the moving touch plate on the side of the pivot center of the moving touch plate, and the second The driving force arm contacts or separates from the end of the moving touch plate on the other side of the pivot center of the moving touch plate, and a moving contact is provided at one end of the moving touch plate close to the first driving force arm. The force arm length from the moving contact to the pivot center of the moving touch plate is greater than the force arm length from the contact position of the second driving force arm with the moving touch plate to the pivot center of the moving touch plate. A conductive sheet is provided in the relay base on the side of the moving touch plate close to the armature assembly, and the conductive sheet is connected to the moving touch plate through a flexible conductive member. A static sheet assembly is provided in the relay base on the side of the moving touch plate away from the armature assembly, and the static sheet assembly includes an electrostatic sheet and a static contact, and the static contact corresponds to the moving contact one by one.

[0008] According to a further preferred technical solution, the relay base includes two installation cavities of rectangular structures of different sizes, wherein a smaller installation cavity is offset on one long side of the other larger installation cavity, an electromagnetic coil assembly is provided in the smaller installation cavity, and the electromagnetic coil assembly is arranged along the direction of the long side, an armature assembly is provided on one side of the electromagnetic coil assembly, and the armature assembly extends from the smaller installation cavity into the larger installation cavity, the moving touch plate is pivotally connected to the larger installation cavity, and the moving touch plate is also arranged along the direction of the long side, and a static sheet assembly is provided in the larger installation cavity on the side of the moving touch plate away from the armature assembly, and the static sheet in the static sheet assembly is extended from the larger installation cavity away from the smaller installation cavity. The short side of one side of the mounting cavity extends to the outside of the relay base, the static contact in the static sheet assembly is arranged on the side of the static sheet near the extension position, the conductive sheet is arranged in the larger mounting cavity on the side of the moving touch plate near the armature assembly, the conductive sheet extends from the long side of one side of the smaller mounting cavity and away from the smaller mounting cavity to the outside of the relay base, the moving contact is arranged at one end of the moving touch plate near the protruding position of the conductive sheet, one end of the conductive sheet located in the larger mounting cavity is connected to the end of the moving touch plate away from the moving contact through a flexible conductive member, and a driving arm is also provided between the moving touch plate and the armature assembly, and the driving arm contacts or separates from the two ends of the moving touch plate respectively.

[0009] According to a further preferred technical solution, the pivot center of the movable touch plate and the pivot center of the armature assembly are on the same straight line, and the straight line is perpendicular to the center line of the electromagnetic coil assembly.

[0010] According to a further preferred technical solution, the moving contact and the static contact are arranged in pairs, each of the moving contacts is fixedly connected to one of the moving contact plates, the two moving contact plates are pivotally connected to the relay base through a mounting seat, and the two moving contact plates rotate independently around a pivot center in the mounting seat.

[0011] A further preferred technical solution is that a semi-circular arc rotating portion is provided on one side of the middle position of the moving touch plate, a pair of coaxial pivot shafts are provided in the middle of the mounting seat, a pair of first arc plates are provided on the outer periphery of the pivot shafts and are fitted with the pivot shafts, a pair of second arc plates are provided on the opposite sides of the pair of first arc plates and are separated from the pivot shafts, and the semi-circular arc rotating portion can be rotatably installed between the pivot shafts and the second arc plates.

[0012] According to a further preferred technical solution, two abutment posts are provided at one end of the mounting seat close to the moving contact, the two abutment posts are at different positions on the mounting seat, and one end of the moving contact plate close to the moving contact abuts against the abutment posts.

[0013] A further preferred technical solution is that the mounting seat is provided with a guard plate between the abutment column and the first arc-shaped plate, and the mounting seat is also provided with a first touch plate on a side close to the driving arm, and a partition is provided between the first touch plate and the guard plate to form two protection cavities, and the side of the moving touch plate close to the moving contact point is located in the corresponding protection cavity, and the end of the mounting seat away from the moving contact point is provided with a connecting plate extending outward from the pivot axis, and the extending end of the connecting plate is provided with an arc-shaped second touch plate, the first driving force arm of the driving arm contacts or separates from the first touch plate, and the second driving force arm of the driving arm contacts or separates from the second touch plate.

[0014] According to a further preferred technical solution, a first elastic sheet is further provided at a position of the movable touch plate close to the movable contact point, the first elastic sheet is respectively connected to the movable contact point and the magnetic attraction member, and is located inside the first touch plate of the mounting seat; A second elastic sheet is further provided at one end of the moving touch plate away from the moving contact point, one end of the second elastic sheet abuts against the moving touch plate, and the other end abuts against the inner side of the relay base close to the electrostatic sheet.

[0015] According to a further preferred technical solution, a magnetic attraction member is disposed on the movable touch plate near the movable contact point, and a magnetic attraction member is also disposed on the electrostatic sheet near the static contact point.

[0016] According to a further preferred technical solution, an arc-starting sheet is provided on the electrostatic sheet near the static contact, and an arc-extinguishing chamber is also provided in the relay base between the electrostatic sheet and the conductive sheet.

[0017] The advantages and beneficial effects of the present invention are as follows: the distance L2 from the contact point between the end of the driving arm away from the moving contact and the moving contact plate to the pivot center of the moving contact plate is smaller than the distance L1 from the moving contact to the pivot center of the moving contact plate. This characteristic is used to enlarge the distance between the moving contact and the static contact, so that when the armature assembly of the magnetic latching relay does not change the rotation angle of the armature assembly, the distance between the moving contact and the static contact becomes larger, thereby realizing the contact and disconnection between the moving contact on the moving contact plate and the static contact on the conductive sheet. This structure using the pivot connection of the moving contact plate can fully utilize the limited space in the relay base on the one hand, and can also increase the distance between the moving contact and the static contact on the other hand, and has a fast action speed, can effectively extinguish the arc, and is not easy to burn the contact; The moving contact corresponding to the moving contact plate is different from the static contact on the static plate assembly in distance and height difference. The pair of contacts with smaller distance are used as arcing contacts, and the pair of contacts with larger distance are used as current carrying contacts. The above setting can ensure that when the relay is normally carrying current, the arc generated when the current is disconnected only affects one pair of contacts, and the surface integrity of the other pair of contacts can be guaranteed, so that the contact resistance of the relay can be kept small and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an axonometric view of the present invention; Figure 2 This is an axonometric view of the present invention without an upper cover; Figure 3 This is a top view of the present invention without the upper cover; Figure 4 It is an internal axonometric diagram of the present invention; Figure 5 It is a top view of the interior of the present invention; Figure 6 This is a schematic diagram of the driving force arm of the present invention; Figure 7 One of the axonometric diagrams of the mounting seat and the moving touch plate of the present invention; Figure 8 The second is an axonometric diagram of the mounting seat and the movable touch plate of the present invention; Fig. 9 This is a schematic diagram of the dislocation of the moving contact of the present invention; Fig.10 This is one of the exploded isometric views of the mounting base and the movable touch plate of the present invention; Fig.11 This is the second exploded isometric view of the mounting base and the moving touch plate of the present invention; In the figure: 10, relay base; 11, mounting cavity; 20, upper cover; 30, anti-magnetic cover; 40, mounting seat; 41, abutment column; 42, guard plate; 43, first arc plate; 44, pivot shaft; 45, connecting plate; 46, second contact plate; 47, second arc plate; 48, first contact plate; 49, partition; 50, conductive sheet; 51, moving contact plate; 52, moving contact; 53, flexible conductive member; 60, arc extinguishing chamber; 61, arc-starting sheet; 70, static sheet assembly; 71, static contact; 72, electrostatic sheet; 80, electromagnetic coil assembly; 90, armature assembly; 91, drive arm; 911, first drive force arm; 912, second drive force arm; 100, second spring sheet; 110, first spring sheet; 120, magnetic attraction member. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0020] like Figure 1-6As shown, the present application provides a magnetic latching relay, which includes a relay base 10 and an upper cover 20 that is snap-fitted and connected. An electromagnetic coil assembly 80 is provided in the relay base 10, and a magnetic shield 30 is provided between the electromagnetic coil assembly 80 and the upper cover 20. A magnetic shield 30 is also provided between the electromagnetic coil assembly 80 and the relay base 10. An armature assembly 90 is provided in the relay base 10 on one side of the electromagnetic coil assembly 80. The armature assembly 90 is pivotally connected in the relay base 10. After the electromagnetic coil of the electromagnetic coil assembly 80 is excited, the magnetic pole changes and attracts / repulses the armature assembly 80, so that the armature assembly 90 moves. The armature assembly 90 is away from one side of the electromagnetic coil assembly 80. A driving arm 91 is provided on the side of the driving arm 91, and the driving arm 91 includes a first driving force arm 911 and a second driving force arm 912. A moving touch plate 51 is provided on the side of the driving arm 91 away from the armature assembly 80, and the moving touch plate 51 is pivotally connected to the relay base 10. The first driving force arm 911 contacts or separates with the end of the moving touch plate 51 on one side of the pivot center of the moving touch plate 51, and the second driving force arm 912 contacts or separates with the end of the moving touch plate 51 on the other side of the pivot center of the moving touch plate 51. The force arm length from the contact position of the first driving force arm 911 with the moving touch plate 51 to the pivot center of the armature assembly 90 is greater than the force arm length from the contact position of the second driving force arm 912 with the moving touch plate 51 to the armature assembly 9 0, at least two moving contacts 52 are provided at one end of the moving touch plate 51 close to the first driving force arm 912, the force arm length from the moving contact 52 to the pivot center of the moving touch plate 51 is greater than the force arm length from the contact position of the second driving force arm 912 and the moving touch plate 51 to the pivot center of the moving touch plate 51, a conductive sheet 50 is provided in the relay base 10 on the side of the moving touch plate 51 close to the armature assembly 90, the conductive sheet 50 is connected to the corresponding moving contacts 52 in a one-to-one correspondence through at least two flexible conductive members 53, and a static sheet assembly 70 is provided in the relay base 10 on the side of the moving touch plate 51 away from the armature assembly 90, the static sheet assembly 70 includes an electrostatic sheet 72 and to There are at least two static contacts 71, and the static contacts 71 correspond to the moving contacts 52 one by one. After the electromagnetic coil of the electromagnetic coil assembly 80 is excited, the magnetic pole changes, and attracts / repulses the armature assembly 90, so that the armature assembly 90 moves. The armature assembly 90 drives the moving contact plate 51 to rotate around the pivot center through the driving arm 91 to realize the disconnection / closing of the moving / static contacts. The conductive sheet assembly in the original structure adopts a shunt sheet assembly structure, which occupies a large amount of space. The spacing between the moving contact 52 and the static contact 71 of the magnetic latching relay is small, so that the arc resistance and breaking capacity of the magnetic latching relay are weak, which cannot meet the requirements of the existing national power grid. By using a flexible conductive member 53 to connect the moving contact 52 and the conductive sheet 50,The space occupied by the conductive sheet assembly on the relay base 10 can be reduced, which is beneficial for arranging the transmission structure of the armature assembly 90 and the conductive sheet assembly, thereby improving the arc extinguishing performance of the magnetic latching relay. Figure 6 As shown, when the armature assembly 90 drives the moving contact plate 51 to rotate, the distance L2 from the contact point between the end of the driving arm 91 away from the moving contact 52 and the moving contact plate 51 to the pivot center of the moving contact plate 51 is smaller than the distance L1 from the moving contact 52 to the pivot center of the moving contact plate 51. This characteristic can be used to enlarge the distance between the moving contact 52 and the static contact 71, so that the distance between the moving contact 52 and the static contact 71 becomes larger without changing the rotation angle of the armature assembly 90 of the magnetic latching relay, thereby realizing the contact and disconnection between the moving contact 52 on the moving contact plate 51 and the static contact 71 on the static sheet 72. This structure using the moving contact plate 51 to pivot can make full use of the limited space in the relay base 10 on the one hand, and can also increase the distance between the moving contact 52 and the static contact 71 on the other hand, and has a fast action speed, can effectively extinguish the arc, and is not easy to burn the contacts.

[0021] like Figure 2-3 As shown, the flexible conductive member 53 is preferably a copper braided wire, and the movable touch plate 51 is connected to the conductive sheet 50 via the copper braided wire. The soft copper braided wire is used to increase the rotation angle of the movable touch plate 51 after connection.

[0022] like Figure 2-4As shown, in order to achieve a miniaturized design, in a specific embodiment, the relay base 10 includes two installation cavities 11 of rectangular structures of different sizes, wherein a smaller installation cavity 11 is offset on one long side of the other larger installation cavity 11, and an electromagnetic coil assembly 80 is provided in the smaller installation cavity 11, and the electromagnetic coil assembly 80 is arranged along the direction of the long side, and an armature assembly 90 is provided on one side of the electromagnetic coil assembly 80, and the armature assembly 90 extends from the smaller installation cavity 11 into the larger installation cavity, and the movable touch plate 51 is pivotally connected to the larger installation cavity 11, and the movable touch plate 51 is also arranged along the long side. The static sheet assembly 70 is arranged in the larger installation cavity 11 on the side of the moving touch plate 51 away from the armature assembly 90, and the electrostatic sheet 72 in the static sheet assembly 70 extends from the short side of the larger installation cavity away from the smaller installation cavity 11 to the outside of the relay base 10. The static contact 71 in the static sheet assembly 70 is arranged on the side where the electrostatic sheet 72 is close to the extension position, and the conductive sheet 50 is arranged in the larger installation cavity 11 on the side of the moving touch plate 51 close to the armature assembly 90. The conductive sheet 50 extends from the long side of the smaller installation cavity 11 and the position away from the smaller installation cavity 11. The movable contact 52 is arranged at one end of the movable contact plate 51 near the extended position of the conductive sheet 50, and one end of the conductive sheet 50 located in the larger installation cavity is connected to the end of the movable contact plate 51 away from the movable contact 52 through a flexible conductive member 53. A driving arm 91 is also provided between the movable contact plate 51 and the armature assembly 90, and the driving arm 91 contacts or separates from the two ends of the movable contact plate 51 respectively. By reasonably arranging the relay assemblies of different lengths, the structure of the relay can be optimized. A smaller installation cavity 11 is provided in the relay base 10 to install a shorter electromagnetic coil assembly 80, and the larger The conductive sheet assembly and the static sheet assembly 70 are installed in the larger installation cavity 11, and are connected by the armature assembly 90 and the drive arm 91. The electromagnetic coil assembly 80, the armature assembly 90, the drive arm assembly, the conductive sheet assembly, and the static sheet assembly 70 are arranged in parallel, and are all contacted or separated by the side, which is beneficial to the miniaturization of the relay. At the same time, the structure of the moving touch plate 51 can be reasonably arranged. The distance L2 from the contact point of the end of the drive arm 91 away from the moving contact 52 with the moving touch plate 51 to the pivot center of the moving touch plate 51 is smaller than the distance L1 from the moving contact 52 to the pivot center of the moving contact plate 51. The spacing between the moving contact 52 and the static contact 51 becomes larger, meeting the national requirements.

[0023] like Figure 3-5As shown, in one embodiment, the pivot center of the moving contact 51 plate and the pivot center of the armature assembly 90 are on the same straight line and the straight line is perpendicular to the center line of the electromagnetic coil assembly 80, so that the contact between the moving contact 52 and the static contact 71 is stable, and the bounce between the contacts is small when closing and opening the switch, thereby improving the reliability of the operation of the magnetic holding relay.

[0024] like Fig. 9 As shown, since it is necessary to ensure that the contact resistance of the relay is in a relatively small state during operation, under the existing contact bearing structure, when the contact surface is burned by the arc, the stability of the contact resistance cannot be effectively guaranteed. It is necessary to consider how to prevent the contact from being burned and reduce the influence of the arc during operation. On this basis, the distances between different moving contacts 52 and the static contacts 71 are different. The contacts with smaller distances are used as arcing contacts, and the contacts with larger distances are used as current-carrying contacts. Through this structure, it can be ensured that when the relay is normally carrying current, the arc generated when the current is disconnected only affects one group of contacts, and the surface integrity of the other group of contacts can be guaranteed. In this way, the contact resistance of the relay can be ensured to be in a relatively small and stable state. Specifically, the moving contact 52 and the static contact 71 are arranged in pairs, each of the moving contact 52 is fixedly connected to one of the moving contact plates 51, and the two moving contact plates 51 are pivotally connected to the relay base 10 through the mounting seat 40, and the two moving contact plates 51 rotate separately around the pivot center in the mounting seat 40.

[0025] like Figure 7-8 As shown, in order to realize the rapid disassembly and assembly of the moving touch plate 51 and to make the spacing between the moving contact 52 and the static contact 71 different so as to realize independent rotation, the moving touch plate 51 is provided with a semicircular arc rotating portion 511 on one side of the middle position, and the middle part of the mounting seat 40 has a pair of coaxial pivot shafts 44, and the outer periphery of the pivot shaft 44 is provided with a pair of first arc plates 43 which are arranged in close contact with the pivot shaft 44, and the opposite sides of the pair of first arc plates 43 are provided with a pair of second arc plates 47 which are separated from the pivot shaft 44, and the semicircular arc rotating portion 511 can be rotatably installed between the pivot shaft 44 and the second arc plate 47.

[0026] like Figure 10-11As shown, two abutment columns 41 are provided at one end of the mounting seat 40 close to the moving contact 52, and the center positions of the two abutment columns 41 on the mounting seat 40 are different, so that after the two moving contact plates 51 are assembled on the mounting seat 40, the end of the moving contact plate 51 close to the moving contact 52 abuts against the abutment column 41, and the distances between the two moving contacts 52 and the corresponding static contacts 71 are different, and the contacts with smaller distances serve as arcing contacts, and the contacts with larger distances serve as current-carrying contacts. Through this structure, it can be ensured that when the relay is normally carrying current, the arc generated when the current is disconnected only affects one group of contacts, and the surface integrity of the other group of contacts can be guaranteed, thereby ensuring that the contact resistance of the relay is in a small and stable state.

[0027] The mounting seat 40 is provided with a guard plate 42 between the abutting column 41 and the first arc-shaped plate 43, and a first touch plate 48 is further provided on the side of the mounting seat 40 close to the driving arm 91, and a partition plate 49 is provided between the first touch plate 48 and the guard plate 42 to form two protection cavities, and the end of the moving touch plate 51 close to the moving contact 52 is located in the corresponding protection cavity, and the end of the mounting seat 40 away from the moving contact 52 is provided with a connecting plate 45 extending outward from the pivot shaft 44, and the extending end of the connecting plate 45 is provided with an arc-shaped second touch plate 46, the first driving force arm 911 of the driving arm 91 contacts or separates from the first touch plate 48, and the second driving force arm 912 of the driving arm 91 contacts or separates from the second touch plate 46.

[0028] like Figure 2-3 As shown, a magnetic member 120 is provided at a position of the moving touch plate 51 close to the moving contact 52. The magnetic member 120 is in a U-shaped structure and is installed on the moving touch plate 51 by a side of the moving touch plate 51 close to the armature assembly 90. A magnetic member 120 is also provided on the electrostatic sheet 72 close to the static contact 71. The magnetic member 120 is made of a high magnetic permeability material. When the moving and static contacts are closed, current enters the moving touch plate 51 from the electrostatic sheet 71. After the moving touch plate 51 is energized, the magnetic member 120 on the moving touch plate 51 is magnetized. The magnetic member 120 is magnetic and attracts the magnetic member 120 on the electrostatic sheet 72 to ensure that the moving contact 52 and the static contact 71 fit more closely.

[0029] like Figure 2-3As shown, the movable touch plate 51 is further provided with a first elastic piece 110 near the movable contact 52. The first elastic piece 110 is connected to the movable contact 52 and the magnetic attraction member 120 respectively. The first elastic piece 110 is made of elastic material and serves as an energy storage element. The first elastic piece 110 is in a hook shape and is located in the first touch plate 48 of the mounting seat 40. When the armature assembly 90 drives the movable touch plate 52 to rotate, the movable contact 52 is disconnected from the static contact 71. After the permanent magnet in the armature assembly 90 is used to absorb the yoke of the electromagnetic coil assembly 80 to complete self-locking, the first elastic piece 110 is deformed to complete energy storage. When the electromagnetic coil assembly 80 is provided with a driving signal, the armature assembly 90 starts to rotate in the opposite direction, and the first elastic piece 110 restores its original shape, which will assist in pushing the movable touch plate 51 to rotate in the opposite direction. The movable contact 52 is attracted to the static contact 71, thereby improving the sensitivity of the movable touch plate 51.

[0030] like Figure 2-3 As shown, a second elastic piece 100 is further provided at one end of the moving touch plate 51 away from the moving contact 52, one end of the second elastic piece 100 abuts against the moving touch plate 51, and the other end abuts against the inner side of the relay base 10 close to the electrostatic sheet 72. The second elastic piece 100 is made of elastic material and serves as an energy storage element. The second elastic piece 100 is in a hook shape. When the armature assembly 90 drives the moving touch plate 51 to rotate, the moving contact 52 is disconnected from the static contact 71, and the permanent magnet in the armature assembly 90 is used to absorb the yoke of the electromagnetic coil assembly 80 to complete self-locking. Then, the second elastic piece 100 is deformed to complete energy storage. When a driving signal of the electromagnetic coil assembly 80 is provided, the armature assembly 90 starts to rotate in the opposite direction, and the second elastic piece 100 restores its original shape, which will assist in pushing the moving touch plate 51 to rotate in the opposite direction. The moving contact 52 is attracted to the static contact 51, thereby improving the sensitivity of the moving touch plate 51.

[0031] like Figure 2-3 As shown, an arc-striking plate 61 is provided on the electrostatic plate 72 near the static contact 71, and an arc-extinguishing chamber 60 is also provided in the relay base 10 between the electrostatic plate 72 and the conductive plate 50. When the moving contact 52 is disconnected from the static contact 71, the arc is guided to the arc-extinguishing chamber 60 through the arc-striking plate 61 of the electrostatic plate 72, so as to eliminate the arc generated when the contacts are disconnected.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A magnetic latching relay, comprising a relay base and a snap-fit ​​upper cover, wherein an electromagnetic coil assembly is disposed in the relay base, an armature assembly is disposed in the relay base on one side of the electromagnetic coil assembly, and the armature assembly is pivotally connected in the relay base, characterized in that: A driving arm is provided on a side of the armature assembly away from the electromagnetic coil assembly, the driving arm includes a first driving force arm and a second driving force arm, a moving touch plate is provided on a side of the driving arm away from the armature assembly, the moving touch plate is pivotally connected to the relay base, the first driving force arm contacts or separates from an end of the moving touch plate on one side of a pivot center of the moving touch plate, the second driving force arm contacts or separates from an end of the moving touch plate on the other side of a pivot center of the moving touch plate, a moving contact is provided at one end of the moving touch plate close to the first driving force arm, a force arm length from the moving contact to the pivot center of the moving touch plate is greater than a force arm length from a contact position of the second driving force arm with the moving touch plate to the pivot center of the moving touch plate, a conductive sheet is provided in the relay base on a side of the moving touch plate close to the armature assembly, the conductive sheet is connected to the moving touch plate through a flexible conductive member, and a static sheet assembly is provided in the relay base on a side of the moving touch plate away from the armature assembly, the static sheet assembly includes an electrostatic sheet and a static contact, and the static contact is matched with the moving contact in a one-to-one correspondence.

2. A magnetic latching relay according to claim 1, characterized in that: The relay base includes two installation cavities of rectangular structures of different sizes, wherein a smaller installation cavity is offset on one long side of the other larger installation cavity, an electromagnetic coil assembly is arranged in the smaller installation cavity, and the electromagnetic coil assembly is arranged along the direction of the long side, an armature assembly is arranged on one side of the electromagnetic coil assembly, and the armature assembly extends from the smaller installation cavity into the larger installation cavity, the moving touch plate is pivotally connected to the larger installation cavity, and the moving touch plate is also arranged along the direction of the long side, and a static sheet assembly is arranged in the larger installation cavity on the side of the moving touch plate away from the armature assembly, and the static sheet in the static sheet assembly is away from the smaller installation cavity by the larger installation cavity. The short side of one side of the body extends to the outside of the relay base, the static contact in the static sheet assembly is arranged on the side of the static sheet near the extension position, the conductive sheet is arranged in the larger mounting cavity on the side of the moving touch plate near the armature assembly, the conductive sheet extends from the long side of one side of the smaller mounting cavity and away from the smaller mounting cavity to the outside of the relay base, the moving contact is arranged at one end of the moving touch plate near the protruding position of the conductive sheet, one end of the conductive sheet located in the larger mounting cavity is connected to the end of the moving touch plate away from the moving contact through a flexible conductive part, and a driving arm is also provided between the moving touch plate and the armature assembly, and the driving arm contacts or separates from the two ends of the moving touch plate respectively.

3. A magnetic latching relay according to claim 2, characterized in that: The pivot center of the movable touch plate and the pivot center of the armature assembly are on the same straight line, and the straight line is perpendicular to the center line of the electromagnetic coil assembly.

4. A magnetic latching relay according to any one of claims 1 to 3, characterized in that: The moving contact and the stationary contact are arranged in pairs, each of the moving contact is fixedly connected to a moving contact plate, the two moving contact plates are pivotally connected in the relay base through a mounting seat, and the two moving contact plates rotate independently around the pivot center in the mounting seat.

5. A magnetic latching relay according to claim 4, characterized in that: The movable touch plate is provided with a semicircular rotating part on one side of the middle position, and the middle part of the mounting seat has a pair of coaxial pivot shafts, the outer periphery of the pivot shaft is provided with a pair of first arc plates which are arranged in close contact with the pivot shaft, and the opposite sides of the pair of first arc plates are provided with a pair of second arc plates which are separated from the pivot shaft, and the semicircular rotating part can be rotatably installed between the pivot shaft and the second arc plate.

6. A magnetic latching relay according to claim 5, characterized in that: One end of the mounting seat close to the moving contact point is provided with two abutment posts, the two abutment posts are located at different positions on the mounting seat, and one end of the moving contact plate close to the moving contact point abuts against the abutment posts.

7. A magnetic latching relay according to claim 6, characterized in that: The mounting seat is provided with a guard plate between the abutting column and the first arc-shaped plate, and a first touch plate is further provided on a side of the mounting seat close to the driving arm, and a partition is provided between the first touch plate and the guard plate to form two protection cavities, and a side of the moving touch plate close to the moving contact point is located in the corresponding protection cavity, and an end of the mounting seat away from the moving contact point is provided with a connecting plate extending outward from the pivot axis, and an arc-shaped second touch plate is provided on the extended end of the connecting plate, and the first driving force arm of the driving arm contacts or separates from the first touch plate, and the second driving force arm of the driving arm contacts or separates from the second touch plate.

8. A magnetic latching relay according to claim 7, characterized in that: A first elastic sheet is further provided at a position of the movable contact plate close to the movable contact point, the first elastic sheet is respectively connected to the movable contact point and the magnetic attraction member, and is located inside the first touch plate of the mounting seat; A second elastic sheet is further provided at one end of the moving touch plate away from the moving contact point, one end of the second elastic sheet abuts against the moving touch plate, and the other end abuts against the inner side of the relay base close to the electrostatic sheet.

9. A magnetic latching relay according to any one of claims 1, 2, 3 or 8, characterized in that: The movable touch plate is provided with a magnetic attraction component at a position close to the movable contact point, and the electrostatic sheet is also provided with a magnetic attraction component at a position close to the static contact point.

10. A magnetic latching relay according to any one of claims 1, 2, 3 or 8, characterized in that: An arc-starting piece is provided on the electrostatic piece near the static contact, and an arc-extinguishing chamber is also provided in the relay base between the electrostatic piece and the conductive piece.

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