A magnetic latching relay

Abstract

The present invention provides a magnetic latching relay, comprising an electromagnetic system, a contact system and a restoring spring. The electromagnetic system drives the contact system to switch between a self-holding state in which the contacts are in contact and a restoring state in which the contacts are separated by controlling the activity of the armature. The restoring spring is fixed on the electromagnetic system and has an elastic part extending therefrom with a stiffness smaller than that of the movable spring of the contact system. The elastic part is located between the armature and the contact system and extends along the width direction of the armature. In the restoring state, the elastic part maintains a certain gap with the armature. When switching from the restoring state to the self-holding state, the armature contacts the elastic part and drives the elastic part to deform. In the self-holding state, the deformation of the elastic part of the restoring spring and the contact pressure together constitute a reaction force system, ensuring that the asymmetric magnetic circuit provides a reaction force to smoothly disconnect the contacts when restoring; the armature moves smoothly and the switching is more reliable.

Description

Technical Field

[0001] The invention relates to the field of relays, and in particular to a magnetic latching relay. Background Art

[0002] A magnetic latching relay is an automatic switch that includes an electromagnetic system and a contact system. It uses the action of permanent magnets to keep the product contact group in a closed or open state. A magnetic latching relay is generally composed of an electromagnetic system and a contact system. The moving contact part of the contact system is connected to the armature of the electromagnetic system and hinged on the bracket of the electromagnetic system. The electromagnetic system drives the contact system to switch between the self-holding state of contact and the reset state of separation from the contacts by controlling the activity of its armature, thus realizing on / off.

[0003] Application publication number CN102945771A discloses a 1 / 2 crystal cover relay electromagnetic system, in which the cantilever of the damping spring is attached to the left end of the armature. When in the released state, a certain pressure is applied to the left end of the armature to improve the sensitivity during state transition and the reliability of magnetic retention in static state. However, the cantilever length of the damping spring attached to the armature is relatively short and the rigidity is too large, which is actually not conducive to the rotation of the armature. Summary of the invention

[0004] Therefore, in order to solve the above problems, the present invention provides a magnetic latching relay, in which the armature moves smoothly during resetting and the switching is more reliable.

[0005] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0006] A magnetic latching relay comprises an electromagnetic system, a contact system and a restoring spring. The electromagnetic system drives the contact system to switch between a self-holding state in which contacts are in contact and a restoring state in which contacts are separated by the contact by controlling the activity of its armature. The restoring spring is fixed to the electromagnetic system and is extended with an elastic part having a stiffness smaller than that of a movable spring of the contact system. The elastic part is located between the armature and the contact system and extends along the width direction of the armature. In the restoring state, the elastic part maintains a certain gap with the armature. When switching from the restoring state to the self-holding state, the armature contacts the elastic part and drives the elastic part to deform.

[0007] Furthermore, the restoring spring includes: a fixing portion, an adjusting portion and the elastic portion, the fixing portion is fixed on the electromagnetic system, the adjusting portion connects the fixing portion and the elastic portion, and the width of the adjusting portion is smaller than that of the fixing portion and larger than that of the elastic portion.

[0008] Furthermore, the restoring spring has an "L"-shaped structure, including a vertical rod and a horizontally arranged cross rod, the fixed portion is located at the upper section of the vertical rod, the adjusting portion is located at the lower section of the vertical rod, and the cross rod is the elastic portion; the adjusting portion is bent laterally so that the fixed portion and the elastic portion are staggered in the vertical plane.

[0009] Furthermore, a push rod is fixed on the armature, and the push rod is fixed on the side of the armature and protrudes from the end of the push rod. The end where the elastic part is connected to the adjusting part is defined as the connecting end, and the other end is the free end. The push rod corresponds to the free end of the elastic part, and when the armature swings, the free end of the elastic part of the restoring spring is contacted through the push rod.

[0010] Furthermore, the surface of the elastic part is also protruded with a convex rib for contacting the push rod, and the surface of the convex rib is an arc surface.

[0011] Furthermore, the contact surface of the push rod for contacting the elastic part is an arc-shaped contact surface.

[0012] Furthermore, the contact system includes a moving contact part connected to the armature of the electromagnetic system and hinged in the middle to the electromagnetic system, and a static contact part corresponding to the moving contact part; the moving contact part includes an insulating block and two groups of moving contact groups fixed on the insulating block and arranged back to back, the insulating block is connected to the armature, and the two groups of moving contact groups each include a moving spring, a supporting piece attached to the moving spring, and a moving contact arranged on the elastic support arm of the moving spring; the contact working surfaces of the moving contacts of the two groups of moving contact groups are in opposite directions; the supporting piece is on the same side as the contact working surface of the moving contact, and is extended with a bending portion of the elastic support arm corresponding to the moving spring, and the insulating block has a recessed portion that gives way to the bending portion of the supporting piece.

[0013] Furthermore, the two groups of moving contact groups are defined as the first moving contact group and the second moving contact group, the contact working surfaces of the moving contacts of the first moving contact group face the insulating block, and the contact working surfaces of the moving contacts of the second moving contact group face away from the insulating block; a moving spring gasket is also fixedly attached to the outer side of the moving spring sheet of the first moving contact group.

[0014] Furthermore, the electromagnetic system includes a fixed frame, a first yoke, a second yoke, a third yoke, a permanent magnet, a self-holding coil, a return coil, an iron core and the armature, the first yoke, the second yoke and the third yoke are arranged at intervals and fixed on the fixed frame, the self-holding coil and the return coil are arranged between the first yoke and the second yoke, the iron core is passed through the self-holding coil and the return coil, the permanent magnet is arranged between the second yoke and the third yoke, the armature is hinged on the fixed frame, and the return spring is fixed on the outer wall of the first yoke.

[0015] Furthermore, the cross-section of the third yoke is an "L"-shaped structure, with a horizontal plate and a vertical plate perpendicular to each other, the bottom of the vertical plate protrudes laterally with a positioning boss for positioning the permanent magnet, the top of the vertical plate protrudes laterally with a limiting boss for limiting the permanent magnet from escaping, the horizontal plate is provided with a clearance opening, and the bottom of the second yoke is provided with a boss, and the boss passes through the clearance opening to correspond to the armature.

[0016] The technical solution provided by the present invention has the following beneficial effects:

[0017] The restoring spring structure designed in this scheme, when in the self-holding state, the elastic restoring force generated by the deformation of the elastic part of the restoring spring and the contact pressure together constitute a reaction force system, ensuring that when the asymmetric magnetic circuit is restored, a reaction force is provided to enable the contacts to be disconnected smoothly, avoiding the situation where the yoke and the armature of the electromagnetic system cannot be attracted due to a large magnetic gap; the armature moves smoothly, the switching is more reliable, and the structure is simple; it is especially suitable for smaller devices such as 1 / 5 cubic inch magnetic holding relays. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1( a ) is a three-dimensional schematic diagram of a magnetic latching relay in a reset state according to an embodiment;

[0019] FIG1( b ) is a three-dimensional schematic diagram of a magnetic latching relay in a self-holding state according to an embodiment;

[0020] Figure 2 The figure shows a schematic diagram of the structure of the recovery reed in the embodiment;

[0021] Figure 3 The figure shows a schematic diagram of the structure of the push rod in the embodiment;

[0022] Figure 4 Shown is a cross-sectional view of a magnetic latching relay in an embodiment;

[0023] Figure 5 The figure shows a schematic diagram of the structure of the moving contact part in the embodiment;

[0024] Figure 6 The figure shows a schematic diagram of the matching structure between the moving contact part and the armature in the embodiment;

[0025] Figure 7 The figure shows a partial structural diagram of the matching of the moving contact part and the stationary contact part in the embodiment;

[0026] Figure 8 The figure shows a partial structural side view of the moving contact part and the stationary contact part in the embodiment;

[0027] Fig. 9 The figure shows a schematic diagram of the structure of the movable spring in the embodiment;

[0028] Fig.10 The figure shows a schematic diagram of the structure of the support sheet in the embodiment;

[0029] Fig.11 The figure shows a schematic diagram of the three-dimensional structure of the third yoke in the embodiment;

[0030] Fig.12 Shown is a side view of the third yoke in the embodiment;

[0031] Fig.13 Shown is a schematic diagram of the three-dimensional structure of the electromagnetic system in the embodiment. DETAILED DESCRIPTION

[0032] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0033] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0034] 1(a) and 1(b), the present embodiment provides a magnetic latching relay, specifically a 1 / 5 cubic inch magnetic latching relay, comprising an electromagnetic system 100, a contact system 200 and a restoring spring 40. The electromagnetic system 100 drives the contact system 200 to switch between a self-holding state in which the contacts are in contact (as shown in FIG. 1(b)) and a restoring state in which the contacts are separated (as shown in FIG. 1(a)) by controlling the activity of its armature 18. The restoring spring 40 is fixed to the electromagnetic system 100 and is extended with an elastic portion 43 having a stiffness less than that of the moving spring of the contact system 200. It is used to improve the sensitivity of the armature 18 during state conversion and avoid interference from suction and reaction forces.

[0035] Specifically, the movable spring is one of the components of the contact system 200, taking this embodiment as an example (but not limited to this); Figure 4 As shown, the moving spring piece 22 is provided with a moving contact 24. When switched to the self-holding state, the moving contact 24 and the stationary contact 34 are in contact, that is, the contacts are in contact. In this state, the moving spring piece 22 is deformed to generate an elastic restoring force, providing a reaction force.

[0036] The elastic part 43 is located between the armature 18 and the contact system 200 and extends along the width direction of the armature 18, so that the elastic part 43 has a sufficient length to ensure flexibility. In the reset state, the elastic part 43 maintains a certain gap with the armature 18. When switching from the reset state to the self-holding state, the armature 18 contacts the elastic part 43 and drives the elastic part 43 to deform.

[0037] During the process of switching from the return state to the self-holding state, the movement of the armature 18 will abut against the elastic part 43 and drive the elastic part 43 to deform, so that in the self-holding state, the elastic restoring force generated by the deformation of the elastic part 43 of the restoring spring 40 and the contact pressure (i.e. the elastic restoring force generated by the deformation of the moving spring 22) together constitute a reaction force system to ensure that the asymmetric magnetic circuit provides a reaction force when returning (i.e. switching from the self-holding state to the return state), so as to avoid the situation where the yoke and the armature 18 of the electromagnetic system 100 cannot be attracted due to the large magnetic gap; the armature 18 moves smoothly, the switching is more reliable and the structure is simple; it is especially suitable for smaller devices such as the 1 / 5 cubic inch magnetic holding relay in this case.

[0038] For details, please refer to Figure 2 As shown, in this embodiment, the restoring spring 40 includes: a fixing portion 41, an adjusting portion 42 and the elastic portion 43. The fixing portion 41 is fixed to the electromagnetic system 100. Specifically, the fixing portion 41 is provided with a welding convex 411, and is fixed to the electromagnetic system 100 by welding the welding convex 411. Of course, other methods such as riveting can also be used. The adjusting portion 42 connects the fixing portion 41 and the elastic portion 43. After assembly, the adjusting portion 42 can be moved with an appropriate tool to change the position of the elastic portion 43, thereby adjusting the reaction force of the restoring spring 40 and the product action voltage.

[0039] The width of the adjusting portion 42 is smaller than the fixing portion 41 and larger than the elastic portion 43 , so that the adjusting portion 42 can ensure a certain flexibility so as to adjust the size of the reaction force through the adjusting portion 42 to achieve correction-free operation; and can also ensure a certain rigidity to ensure the position of the elastic portion 43 , that is, to ensure the consistency of the reaction force.

[0040] More specifically, the restoring spring 40 is in an "L"-shaped structure, including a vertical rod and a horizontal rod, the fixing portion 41 is located at the upper section of the vertical rod, the adjusting portion 42 is located at the lower section of the vertical rod, and the horizontal rod is the elastic portion 43; the adjusting portion 42 is bent laterally so that the fixing portion 41 and the elastic portion 43 are staggered on the vertical plane. In this way, the fixing portion 41 can be fixed to the outer end of the electromagnetic system 100, and the elastic portion 43 is extended from the outside to the inside by the adjusting portion 42 to correspond to the armature 18, and the structural design is ingenious.

[0041] Furthermore, since the restoring spring 40 is located at one end of the yoke, in order to avoid the bending of the adjusting portion 42 and the elastic portion 43 from interfering with the armature 18, the elastic portion 43 and the armature 18 preferably maintain a certain distance. A push rod 50 is fixed to the armature 18, and the push rod 50 is fixed to the side of the armature 18 and protrudes from the end of the push rod 50, so that the armature 18 will not interfere with the cooperation between the contact system. The end of the elastic portion 43 connected to the adjusting portion 42 is defined as the connecting end 4301, and the other end is defined as the free end 4302. The push rod 50 corresponds to the free end 4302 of the elastic portion 43, and when the armature 18 swings, the push rod 50 contacts the free end 4302 of the elastic portion 43 of the restoring spring 40, thereby driving the elastic portion 43 to deform. In this way, the interference of the bending position of the adjusting portion 42 with the armature 18 is completely avoided. Furthermore, the free end 4302 of the elastic portion 43 is not connected to other structures, and the elastic deformation capacity at the free end 4302 is optimal, the deformation stroke is maximum, and it is easy to control and adjust.

[0042] Of course, in other embodiments, the push rod 50 may correspond to the middle position of the elastic part 43 (i.e., the position between the free end 4302 and the connecting end 4301), etc., which can also achieve the action, but the effect may be poor. Alternatively, the armature 18 and the elastic part 43 may also be in direct contact, but this will easily cause mutual interference, and the position requirements of the elastic part 43 and the armature 18 are higher. Neither of them is the best solution.

[0043] The surface of the elastic part 43 also has a convex rib 431 protruding thereon for contacting the push rod 50, and the surface of the convex rib 431 is an arc-shaped surface; similarly, the contact surface 51 of the push rod 50 for contacting the elastic part 43 is an arc-shaped contact surface. The contact friction between the restoring spring 40 and the push rod 50 is reduced, the wear of the restoring spring 40 and the push rod 50 is reduced, and the contact stability and reaction force stability of the relay during its service life are ensured. Of course, in other embodiments, the convex rib 431 on the surface of the elastic part 43 may be provided separately, or the arc-shaped contact surface of the push rod 50 may be provided separately; or neither of them may have a structure for reducing friction, etc.

[0044] Specifically, in this embodiment, continue to refer to Figure 4 , Figures 11 to 13As shown, the electromagnetic system 100 includes a fixed frame 10, a first yoke 11, a second yoke 12, a third yoke 13, a permanent magnet 14, a self-holding coil 15, a return coil 16, an iron core 17 and the armature 18, the first yoke 11, the second yoke 12 and the third yoke 13 are arranged at intervals and fixed on the fixed frame 10, the self-holding coil 15 and the return coil 16 are arranged between the first yoke 11 and the second yoke 12, the iron core 17 is passed through the self-holding coil 15 and the return coil 16, the permanent magnet 14 is arranged between the second yoke 12 and the third yoke 13, the armature 18 is hinged on the fixed frame 10, and the return spring 40 is fixed on the outer wall of the first yoke 11.

[0045] The permanent magnet 14 provides a holding force for the self-holding state and the return state. In the return state, the armature 18 is attracted to the first yoke 11, and in the self-holding state, the armature 18 is attracted to the second yoke 12. The specific action principle is the prior art and will not be described in detail here.

[0046] Preferably, the structures of the first yoke 11 and the second yoke 12 are asymmetric, which are used to match the asymmetric contact system reaction force. At the same time, the winding window sizes of the self-holding coil 15 and the reset coil 16 in the electromagnetic system 100 are different, the coil resistance values ​​are the same, and the ampere-turn values ​​are different, which are used to provide different electromagnetic suction forces to match the asymmetric contact system reaction force. The magnetic circuit matches the asymmetric contact system reaction force through the structural asymmetry of the yoke parts and the asymmetry of the coil ampere-turns, fully utilizes the structural space, and realizes the miniaturization design of the magnetic holding relay.

[0047] The cross section of the third yoke 13 is an "L"-shaped structure, with a horizontal plate 132 and a vertical plate 131 perpendicular to each other. The vertical plate 131 of the third yoke 13 has a positioning boss 1301 protruding laterally for positioning the permanent magnet 14, which can effectively position the permanent magnet 14. And the top of the vertical plate 131 also has a limiting boss 1302 protruding laterally for limiting the permanent magnet 14 from escaping, preventing the permanent magnet 14 from escaping upward, and ensuring the stable assembly of the permanent magnet 14. Of course, in other embodiments, the assembly method of the permanent magnet 14 is not limited to this, such as only using the structure of the positioning boss 1301 or the limiting boss 1302, or using other structures for positioning or limiting.

[0048] The transverse plate 132 is provided with a clearance opening 1303 , and the bottom of the second yoke 12 is provided with a boss 121 , which passes through the clearance opening 1303 and corresponds to the armature 18 to generate an electromagnetic attraction relationship with the armature 18 , and will not interfere with the cooperation between the second yoke 12 and the armature 18 .

[0049] The side edge of the transverse plate 132 is inwardly recessed with a coil lead wire groove 1304 to make room for the coil wire, making the structure more compact.

[0050] The electromagnetic system 100 can ensure that the armature holding force is more than 1.2N in both the self-holding state and the reset state, thereby improving the ability of the relay to resist vibration, impact and centrifugal acceleration.

[0051] Of course, in other embodiments, the structure of the electromagnetic system 100 is not limited thereto, and may also be replaced by an existing magnetic holding electromagnetic system structure.

[0052] Continue to refer to Figures 5 to 10 As shown, the contact system 200 includes a moving contact part 20 connected to the armature 18 of the electromagnetic system 100 and hinged in the middle to the electromagnetic system 100, and a stationary contact part 30 corresponding to the moving contact part 20; specifically, the moving contact part 20 includes an insulating block 21 and two groups of moving contact groups fixed on the insulating block 21 and arranged back to back, the insulating block 21 is connected to the armature 18, and an axial hole (not shown) is provided between the insulating block 21 and the armature 18, a rotating shaft 27 is passed through the axial hole, and the moving contact part 30 is hinged to the fixed frame 10 of the electromagnetic system 100 through the rotating shaft 27.

[0053] The insulating block 21 is made of a ceramic block, which has the characteristics of good insulation, stable structure and low cost. Of course, in other embodiments, the insulating block can also be made of other insulating materials.

[0054] The two groups of moving contact points each include a moving spring 22, a supporting piece 23 attached to the moving spring 22, and a moving contact 24 disposed on an elastic arm 2201 of the moving spring 22; the contact working surfaces of the moving contacts 24 of the two groups of moving contact points face in opposite directions, thus realizing two groups of moving-closed contacts and a series voltage-dividing function, thereby meeting the user's high-voltage load test requirements.

[0055] Specifically, the two moving contact groups are defined as a first moving contact group 201 and a second moving contact group 202; the moving reed 22, the supporting piece 23 and the moving contact 24 of the first moving contact group 201 are respectively a first moving reed 221, a first supporting piece 231 and a first moving contact 241; the moving reed 22, the supporting piece 23 and the moving contact 24 of the second moving contact group 202 are respectively a second moving reed 222, a second supporting piece 232 and a second moving contact 242; the contact working surface of the first moving contact 241 of the first moving contact group 201 faces the insulating block 21, and the contact working surface of the second moving contact 242 of the second moving contact group 202 faces away from the insulating block 21.

[0056] The supporting piece 23 is on the same side as the contact working surface of the moving contact 24, that is, the first supporting piece 231 is located between the first moving spring piece 221 and the insulating block 21, and the second moving spring piece 222 is located between the second supporting piece 232 and the insulating block 21. The supporting pieces 23 are each extended with a bent portion 2301 corresponding to the elastic arm 2201 of the moving spring piece 22. The supporting piece 23 plays a role in avoiding vibration bridging on the one hand, and in stabilizing the moving spring piece 22 on the other hand.

[0057] At the same time, the insulating block 21 has a recessed portion 211 of a bent portion 2301 that gives way to a support plate (specifically, the first support plate 231), which can give way to the first support plate 231 facing the insulating block 21, thereby realizing two sets of normally closed contacts and ensuring the contact gap without increasing the volume of the relay.

[0058] Specifically, recesses 211 are provided on both sides of the insulating block 21 , so that the first movable contact group 21 can be made to give way no matter which side it is located on, thereby facilitating assembly.

[0059] Specifically, the movable spring piece 22 is a U-shaped movable spring piece, having two elastic arms 2201, and the two elastic arms 2201 are both provided with movable contacts 24. That is, each movable contact group has two movable contacts 24. At the same time, the supporting piece 23 is also a U-shaped supporting piece, having two arms, and the two arms form a bending portion 2301, which respectively corresponds to the two elastic arms 2201 of the movable spring piece 22.

[0060] Furthermore, in the first moving contact group 201, the first moving spring piece 221 is outside the first supporting piece 231, and a moving spring gasket 26 is fixedly attached to the outside of the first moving spring piece 221, so that the first moving spring piece 221 is fixed more stably, which is beneficial to the stability of the product contact pressure.

[0061] Specifically, the two moving contact groups are fixed to the insulating block by riveting with rivets 25, which is simple and firm to assemble. Of course, in other embodiments, other fixing methods such as bolting can also be used for fixing.

[0062] Specifically, the insulating block 21 has protrusions with ribs 212 for isolating the two moving contact groups, so as to increase the creepage distance between the two moving contact groups and improve the voltage resistance of the product.

[0063] like Figure 4 , Figure 7 and Figure 8As shown, the static contact part 30 includes a base 31, a pin 32, a connecting piece 33 and a static contact 34. The pin 32 is inserted into the base 31, the connecting piece 33 is fixed on the pin 32, and the static contact 34 is arranged on the connecting piece 33 to correspond to the contact working surface of the moving contact 24 of the moving contact part 20. Specifically, there are eight pins 32, and the number of the connecting pieces 33 is four, which are connected to four of the pins 32 and correspond to four moving contacts 24 respectively.

[0064] Of course, in other embodiments, the structure of the contact system 200 is not limited thereto, and may also be replaced by a structure in the prior art.

[0065] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A magnetic latching relay, comprising an electromagnetic system and a contact system, wherein the electromagnetic system drives the contact system to switch between a self-holding state in which contacts are in contact and a reset state in which contacts are separated by controlling the activity of its armature; Features: It also includes a restoring spring, which is fixed on the electromagnetic system and extends with an elastic part whose stiffness is smaller than that of the moving spring of the contact system, the elastic part is located between the armature and the contact system, and extends along the width direction of the armature, and in the restoring state, the elastic part and the armature maintain a certain gap, and when switching from the restoring state to the self-holding state, the armature contacts the elastic part and drives the elastic part to deform; the restoring spring includes: a fixed part, an adjusting part and the elastic part, the fixed part is fixed on the electromagnetic system, and the adjusting part connects the fixed part and the elastic part; a push rod is fixed on the armature, the push rod is fixed on the side of the armature and protrudes from the end of the push rod, the end of the elastic part connected to the adjusting part is defined as the connecting end, and the other end is defined as the free end, the push rod corresponds to the free end of the elastic part, and contacts the free end of the elastic part of the restoring spring through the push rod when the armature swings.

2. The magnetic latching relay according to claim 1, Features: The width of the adjusting portion is smaller than that of the fixing portion and larger than that of the elastic portion.

3. The magnetic latching relay according to claim 2, Features: The restoring spring has an "L"-shaped structure, including a vertical rod and a horizontally arranged cross rod. The fixed portion is located at the upper section of the vertical rod, the adjusting portion is located at the lower section of the vertical rod, and the cross rod is the elastic portion. The adjusting portion is bent laterally so that the fixed portion and the elastic portion are staggered in the vertical plane.

4. The magnetic latching relay according to claim 1, Features: The surface of the elastic part is also protruded with a convex rib for contacting the push rod, and the surface of the convex rib is an arc surface.

5. The magnetic latching relay according to claim 1 or 4, Features: The contact surface of the push rod for contacting the elastic part is an arc-shaped contact surface.

6. The magnetic latching relay according to claim 1, Features: The contact system includes a moving contact part connected to the armature of the electromagnetic system and hinged to the electromagnetic system in the middle, and a static contact part corresponding to the moving contact part; the moving contact part includes an insulating block and two groups of moving contact groups fixed on the insulating block and arranged back to back, the insulating block is connected to the armature, and the two groups of moving contact groups each include the moving spring, a supporting piece attached to the moving spring, and a moving contact arranged on the elastic support arm of the moving spring; the contact working surfaces of the moving contacts of the two groups of moving contact groups are in opposite directions; the supporting piece is on the same side as the contact working surface of the moving contact, and is extended with a bending portion of the elastic support arm corresponding to the moving spring, and the insulating block has a recessed portion that gives way to the bending portion of the supporting piece.

7. The magnetic latching relay according to claim 6, Features: The two moving contact groups are defined as a first moving contact group and a second moving contact group, the contact working surface of the moving contacts of the first moving contact group faces the insulating block, and the contact working surface of the moving contacts of the second moving contact group faces away from the insulating block; a moving spring gasket is also fixedly attached to the outer side of the moving spring sheet of the first moving contact group.

8. The magnetic latching relay according to claim 1, Features: The electromagnetic system includes a fixed frame, a first yoke, a second yoke, a third yoke, a permanent magnet, a self-holding coil, a return coil, an iron core and the armature. The first yoke, the second yoke and the third yoke are arranged at intervals and fixed on the fixed frame. The self-holding coil and the return coil are arranged between the first yoke and the second yoke. The iron core is passed through the self-holding coil and the return coil. The permanent magnet is arranged between the second yoke and the third yoke. The armature is hinged on the fixed frame, and the return spring is fixed on the outer wall of the first yoke.

9. The magnetic latching relay according to claim 8, Features: The cross-section of the third yoke is an "L"-shaped structure, with a horizontal plate and a vertical plate perpendicular to each other, a positioning boss for positioning the permanent magnet protrudes laterally from the bottom of the vertical plate, a limiting boss for limiting the permanent magnet from escaping protrudes laterally from the top of the vertical plate, a clearance opening is opened on the horizontal plate, and a boss is set on the bottom of the second yoke, and the boss passes through the clearance opening and corresponds to the armature.

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