CN113782394A

CN113782394A - Magnetic latching relay

Info

Publication number: CN113782394A
Application number: CN202111134871.9A
Authority: CN
Inventors: 林江煌; 李学龙
Original assignee: Xiamen Hongfa Hermetically Sealed Relays Co ltd
Current assignee: Xiamen Hongfa Hermetically Sealed Relays Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2021-12-10
Anticipated expiration: 2041-09-27
Also published as: CN113782394B

Abstract

The present invention provides a magnetic latching relay, comprising an electromagnetic system, a contact system and a restoring reed. The electromagnet system drives the contacting system to be in a self-retaining state in which the contacts are in contact with the contacts and in a self-retaining state when the contacts are separated from the contacts by controlling the movement of the armature of the electromagnetic system. switch between states; the restoring reed is fixed on the electromagnetic system and extends with an elastic part whose rigidity is less than that of the moving reed 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 reset state, the elastic part and the armature maintain a certain gap, and when switching from the reset 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 reed and the contact pressure together form a reaction force system, which ensures that the asymmetric magnetic circuit provides a reaction force to make the contacts disconnect smoothly when the asymmetric magnetic circuit is restored; the armature moves smoothly and the switching is more reliable.

Description

Magnetic latching relay

Technical Field

The invention relates to the field of relays, in particular to a magnetic latching relay.

Background

The magnetic latching relay is an automatic switch, which comprises an electromagnetic system and a contact system, and makes use of the action of permanent magnetic steel to make a contact group of a product in a closed or open state. The magnetic latching relay generally comprises an electromagnetic system and a contact system, wherein a moving contact part of the contact system is connected with an armature of the electromagnetic system and is hinged on a bracket of the electromagnetic system, and the electromagnetic system drives the contact system to switch between a self-holding state in which a contact is contacted with the contact and a reset state in which the contact is separated from the contact by controlling the movement of the armature of the electromagnetic system; on/off is realized.

Application publication No. CN102945771A discloses a 1/2 crystal cover relay electromagnetic system, the cantilever laminating of its damping reed is at the left end of armature, and during the release state, exerts certain pressure at the left end of armature, improves the sensitivity when the state switches and the reliability of magnetism maintenance when static, but this damping reed is shorter with the cantilever length of armature laminating, and the rigidity is too big, and the armature that actually is unfavorable rotates.

Disclosure of Invention

Therefore, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a magnetic latching relay in which an armature operates smoothly at the time of return and switching is more reliable.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a magnetic latching relay comprises an electromagnetic system, a contact system and a reset reed, wherein the electromagnetic system drives the contact system to switch between a self-holding state that contacts and a reset state that is separated from the contacts by controlling the movement of an armature of the electromagnetic system; the restoring reed is fixed on the electromagnetic system and extends to form an elastic part with rigidity smaller than that of a movable reed of the contact system, the elastic part is positioned between the armature and the contact system and extends along the width direction of the armature, a certain gap is kept between the elastic part and the armature in the restoring state, and when the restoring state is switched to the self-holding state, the armature contacts the elastic part and drives the elastic part to deform.

Further, the return spring comprises: the electromagnetic system comprises a fixing part, an adjusting part and an elastic part, wherein the fixing part is fixed on the electromagnetic system, the adjusting part is connected with the fixing part and the elastic part, and the width of the adjusting part is smaller than that of the fixing part and larger than that of the elastic part.

Furthermore, the restoring reed is of an L-shaped structure and comprises a vertical rod and a horizontal rod, the vertical rod is vertically arranged, the horizontal rod is horizontally arranged, the fixing part is located at the upper section of the vertical rod, the adjusting part is located at the lower section of the vertical rod, and the horizontal rod is the elastic part; the adjusting part is bent laterally to enable the fixing part and the elastic part to be staggered on a vertical plane.

Furthermore, a pushing rod is fixed on the armature and fixed on the side face of the armature and protrudes out of the end of the pushing rod, the end, connected with the adjusting part, of the elastic part is defined as a connecting end, the other end of the elastic part is defined as a free end, the pushing rod corresponds to the free end of the elastic part, and the pushing rod contacts the free end of the elastic part of the restoring reed when the armature swings.

Furthermore, the surface of the elastic part is also provided with a convex rib for contacting the push rod in a protruding mode, and the surface of the convex rib is an arc-shaped surface.

Further, the contact surface of the push rod for contacting the elastic part is an arc contact surface.

Furthermore, the contact system comprises a movable contact part and a fixed contact part, wherein the movable contact part is connected with the armature of the electromagnetic system, and the middle part of the movable contact part is hinged on the electromagnetic system; the movable contact part comprises an insulating block and two groups of movable contact groups which are fixed on the insulating block and arranged in a back-to-back manner, the insulating block is connected with the armature, and the two groups of movable contact groups comprise a movable spring piece, a supporting sheet attached to the movable spring piece and a movable contact arranged on an elastic supporting arm of the movable spring piece; the contact working surfaces of the movable contacts of the two groups of movable contact groups are opposite in direction; the support sheet is arranged on the same side of the contact working surface of the movable contact, a bending part corresponding to the elastic support arm of the movable spring piece extends, and a concave part which is arranged at the bending part of the support sheet is arranged on the insulating block.

Further, two groups of movable contact groups are defined as a first movable contact group and a second movable contact group respectively, the contact working surface of the movable contact of the first movable contact group faces the insulating block, and the contact working surface of the movable contact of the second movable contact group deviates from the insulating block; and a movable spring gasket is fixedly attached to the outer side of the movable spring of the first movable contact group.

Furthermore, electromagnetic system includes mount, first yoke, second yoke, third yoke, permanent magnet steel, self-sustaining coil, reset coil, iron core and armature, first yoke, second yoke and third yoke are the interval setting and fix on the mount, self-sustaining coil and reset coil set up between first yoke and second yoke, the iron core wears to locate in self-sustaining coil and the reset coil, permanent magnet steel sets up between second yoke and third yoke, armature articulates on the mount, the reset reed is fixed on the lateral wall of first yoke.

Further, the cross-section of third yoke is "L" shape structure, has mutually perpendicular's diaphragm and riser, the bottom side direction protrusion of riser has the location boss of location permanent magnet steel, the top side direction protrusion of riser has the spacing boss that is used for spacing permanent magnet steel to deviate from, seted up the opening of stepping down on the diaphragm, the bottom of second yoke is provided with the boss, the boss passes the opening of stepping down and corresponds armature.

Through the technical scheme provided by the invention, the method has the following beneficial effects:

according to the restoring reed structure designed by the scheme, when the restoring reed structure is in a self-holding state, the elastic restoring force generated by the deformation of the elastic part of the restoring reed and the contact pressure jointly form a counter-force system, so that when an asymmetric magnetic circuit is restored, counter-force is provided to enable a contact to be disconnected smoothly, and the situation that a yoke and an armature of an electromagnetic system cannot be attracted due to a large magnetic gap is avoided; the armature moves smoothly, the switching is more reliable, and the structure is simple; it is especially suitable for smaller-sized devices such as 1/5 cubic inch magnetic latching relays.

Drawings

Fig. 1(a) is a schematic perspective view of a magnetic latching relay in a reset state in an embodiment;

fig. 1(b) is a perspective view of the magnetic latching relay in the self-holding state in the embodiment;

FIG. 2 is a schematic structural diagram of a restoring spring plate in the embodiment;

FIG. 3 is a schematic structural view of a push rod in the embodiment;

fig. 4 is a sectional view showing a magnetic latching relay in the embodiment;

FIG. 5 is a schematic structural diagram of a movable contact part in the embodiment;

FIG. 6 is a schematic diagram of the mating structure of the moving contact portion and the armature of the embodiment;

FIG. 7 is a schematic view showing a part of the structure of the movable contact part and the stationary contact part which are engaged with each other in the embodiment;

FIG. 8 is a side view showing a part of the structure of the movable contact portion and the stationary contact portion which are mated in the embodiment;

FIG. 9 is a schematic structural view of a movable spring plate in the embodiment;

FIG. 10 is a schematic structural view of a blade in an embodiment;

fig. 11 is a schematic perspective view of a third yoke in the embodiment;

fig. 12 is a side view of a third yoke in the embodiment;

fig. 13 is a schematic perspective view of an electromagnetic system according to an embodiment.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1(a) and 1(b), the present embodiment provides a magnetic latching relay, specifically an 1/5 cubic inch magnetic latching relay, which includes an electromagnetic system 100, a contact system 200, and a restoring spring 40, wherein the electromagnetic system 100 controls the movement of the armature 18 thereof to actuate the contact system 200 to switch between a self-holding state (shown in fig. 1 (b)) in which the contacts are in contact and a restoring state (shown in fig. 1 (a)) in which the contacts are separated. The return spring 40 is fixed to the electromagnetic system 100 and extends with a spring portion 43 having a stiffness lower than that of the movable spring of the contact system 200. The device is used for improving the sensitivity of the armature 18 during state conversion and avoiding the interference of suction counter force.

Specifically, the movable spring is one of the components of the contact system 200, which is exemplified by the present embodiment (but not limited thereto); in this embodiment, as shown in fig. 4, the movable contact spring 22 is provided with a movable contact 24. When switched to the self-holding state, the movable contact 24 is in contact with the stationary contact 34, i.e., the contacts are in contact. In this state, the movable spring 22 is deformed to generate an elastic restoring force, providing a reaction force.

The spring portion 43 is located between the armature 18 and the contact system 200 and extends along the width of the armature 18 such that the spring portion 43 has a sufficient length to ensure flexibility. In the return state, the elastic portion 43 maintains a certain gap with the armature 18, and when the return state is switched to the self-holding state, the armature 18 contacts the elastic portion 43 and drives the elastic portion 43 to deform.

In the process of switching from the reset state to the self-holding state, the movement of the armature 18 can abut against the elastic part 43 and drive the elastic part 43 to deform, so that when in the self-holding state, the elastic restoring force generated by the deformation of the elastic part 43 of the restoring reed 40 and the contact pressure (namely the elastic restoring force generated by the deformation of the movable reed 22) jointly form a counterforce system, the counterforce is provided to ensure that the contact of the contact system is disconnected smoothly when the asymmetric magnetic circuit is reset (namely the self-holding state is switched to the reset state), and the condition that the yoke iron and the armature 18 of the electromagnetic system 100 cannot be attracted due to larger magnetic gap is avoided; the armature 18 acts smoothly, the switching is more reliable and the structure is simple; the magnetic latching device is particularly suitable for devices with smaller sizes such as 1/5 cubic inch magnetic latching relays and the like.

Specifically, as shown in fig. 2, in the present embodiment, the restoring spring 40 includes: the fixing portion 41 is fixed on the electromagnetic system 100, specifically, the fixing portion 41 is provided with a welding bud 411, and is welded and fixed on the electromagnetic system 10 through the welding bud 411, of course, other methods such as riveting and fixing may also be adopted. The adjusting portion 42 connects the fixing portion 41 and the elastic portion 43, and after the assembly is completed, the adjusting portion 42 can be broken by a proper tool to change the position of the elastic portion 43, thereby adjusting the reaction force of the restoring spring 40 and the product operating voltage.

The width of the adjusting part 42 is smaller than that of the fixing part 41 and larger than that of the elastic part 43; the adjusting part 42 can ensure certain flexibility, so that the magnitude of the counter force can be adjusted through the adjusting part 42, and correction is avoided; a certain rigidity can be ensured to ensure the position of the elastic part 43, i.e. the consistency of the reaction force.

More specifically, the restoring spring 40 is in an "L" shaped structure, and includes a vertical rod vertically disposed and a horizontal rod horizontally disposed, the fixing portion 41 is located at an upper section of the vertical rod, the adjusting portion 42 is located at a lower section of the vertical rod, and the horizontal rod is the elastic portion 43; the adjustment portion 42 is laterally bent such that the fixing portion 41 and the elastic portion 43 are offset in a vertical plane. With such an arrangement, the fixing portion 41 can be fixed at the outer end of the electromagnetic system 100, and the elastic portion 43 extends from the adjusting portion 42 to the inside to correspond to the armature 18, so that the structure design is ingenious.

Further, since the return spring 40 is located at one end of the yoke, the elastic portion 43 is preferably spaced from the armature 18 by a predetermined distance in order to prevent interference between the bent portions of the adjustment portion 42 and the elastic portion 43 and the armature 18. A push rod 50 is fixed to armature 18, and push rod 50 is fixed to the side of armature 18 and protrudes from the end of push rod 50, so as not to interfere with the engagement of armature 18 with the contact system. The end of the elastic part 43 connected to the adjusting part 42 is defined as a connecting end 4301, the other end is defined as a free end 4302, the pushing rod 50 corresponds to the free end 4302 of the elastic part 43, and the pushing rod 50 contacts the free end 4302 of the elastic part 43 of the restoring spring 40 when the armature 18 swings, so as to drive the elastic part 43 to deform. In this way, interference of the bent position of the adjustment portion 42 with the armature 18 is completely avoided. And the free end 4302 of the elastic part 43 is not connected with other structures, so that the elastic deformation capacity of the position of the free end 4302 is optimal, the deformation stroke is maximum, and the control and the adjustment are easy.

Of course, in other embodiments, the pushing rod 50 may correspond to the middle position of the elastic portion 43 (i.e. the position between the free end 4302 and the connection end 4301), and so on, and this may also achieve the action, but the effect may be poor. Or else: the armature 18 and the spring portion 43 may also be in direct contact, but this may relatively easily cause interference, and the requirement for the position of the spring portion 43 and the armature 18 is high. Are not optimal solutions.

The surface of the elastic part 43 is also protruded with a convex rib 431 for contacting the push rod 50, and the surface of the convex rib 431 is an arc surface; also, the contact surface 51 of the push lever 50 for contacting the elastic portion 43 is an arc-shaped contact surface. The contact friction force between the restoring reed 40 and the push rod 50 is reduced, the abrasion of the restoring reed 40 and the push rod 50 is reduced, and the contact stability and the counter force stability of the relay in the service life are ensured. Of course, in other embodiments, the rib 431 of the surface of the elastic part 43 may be separately provided, or the arc-shaped contact surface of the push rod 50 may be separately provided; or no friction reducing structure is provided.

Specifically, in the present embodiment, with continued reference to fig. 4 and 11 to 13, the electromagnetic system 100 includes a fixed frame 10, a first yoke 11, a second yoke 12, a third yoke 13, a permanent magnetic steel 14, a self-holding coil 15, a return coil 16, an iron core 17, and the armature 18, wherein 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 arranged in the self-holding coil 15 and the return coil 16, the permanent magnetic steel 14 is arranged between the second yoke 12 and the third yoke 13, the armature 18 is hinged to the fixed frame 10, and the return spring 40 is fixed on an outer side wall of the first yoke 11.

The permanent magnet 14 provides a holding force for the self-holding state and the reset state. In the reset 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 the detailed description is not provided herein.

Preferably, the first yoke 11 and the second yoke 12 are asymmetric in structure for matching the asymmetric contact system reaction force. Meanwhile, the winding windows of the self-holding coil 15 and the reset coil 16 in the electromagnetic system 100 are different in size, the coil resistance values are the same, and the ampere-turn values are different, so that the different electromagnetic attraction force is provided, and the different electromagnetic attraction force is used for matching with the asymmetric contact system counter force. The magnetic circuit is matched with the counter force of an asymmetric contact system through the structural asymmetry of the yoke parts and the asymmetry of the ampere turns of the coil, the structural space is fully utilized, and the miniaturization design of the magnetic latching relay is realized.

The cross section of the third yoke 13 is in an L-shaped structure and is provided with a transverse plate 132 and a vertical plate 131 which are perpendicular to each other, and a positioning boss 1301 for positioning the permanent magnetic steel 14 protrudes laterally from the vertical plate 131 of the third yoke 13, so that the permanent magnetic steel 14 can be positioned effectively. And the top of the vertical plate 131 also laterally protrudes with a limit boss 1302 for limiting the permanent magnetic steel 14 to be separated, so that the permanent magnetic steel 14 is prevented from being separated upwards, and the stable assembly of the permanent magnetic steel 14 is ensured. Of course, in other embodiments, the assembly manner of the permanent magnetic steel 14 is not limited to this, for example, only the positioning boss 1301 or the limiting boss 1302 is adopted, or other structures are adopted for positioning or limiting, and the like.

The transverse plate 132 is provided with a abdication opening 1303, the bottom of the second yoke 12 is provided with a boss 121, and the boss 121 penetrates through the abdication opening 1303 to correspond to the armature 18 so as to generate an electromagnetic attraction relationship with the armature 18, so that the cooperation between the second yoke 12 and the armature 18 is not interfered.

The side of diaphragm 132 inwards caves in and has coil lead wire groove 1304, gives way the wire of coil for the structure is more compact.

The electromagnetic system 100 can ensure that the armature retaining force is more than 1.2N in the self-retaining state and the resetting state, and the vibration resistance, impact resistance and centrifugal acceleration resistance of the relay are improved.

Of course, in other embodiments, the structure of the electromagnetic system 100 is not limited thereto, and an existing magnetically-retained electromagnetic system structure may be used instead.

With continued reference to fig. 5-10, the contact system 200 includes a moving contact portion 20 connected to the armature 18 of the electromagnetic system 100 and hinged centrally to the electromagnetic system 100 and a stationary contact portion 30 corresponding to the moving contact portion 20; specifically, the moving contact part 20 includes an insulating block 21 and two sets of moving contact sets fixed on the insulating block 21 and arranged oppositely, the insulating block 21 is connected with the armature 18, a shaft hole (not shown) is formed between the insulating block 21 and the armature 18, and a rotating shaft 27 penetrates through the shaft hole and is hinged on the fixing frame 10 of the electromagnetic system 100 through the rotating shaft 27.

The insulating block 21 is a ceramic block and has the characteristics of good insulating property, stable structure, low cost and the like; of course, in other embodiments, the insulating block may be made of other insulating materials.

The two groups of movable contact sets comprise a movable spring piece 22, a supporting sheet 23 attached to the movable spring piece 22 and a movable contact 24 arranged on an elastic support arm 2201 of the movable spring piece 22; the contact working faces of the movable contacts 24 of the two sets of movable contact sets are oppositely facing. The contact form of two sets of dynamic combinations is realized, the function of series connection voltage division is realized, and the test requirement of a high-voltage load of a user is met.

Specifically, two groups of moving contact groups are defined as a first moving contact group 201 and a second moving contact group 202 respectively; the movable spring piece 22, the holder piece 23 and the movable contact 24 of the first movable contact group 201 are respectively a first movable spring piece 221, a first holder piece 231 and a first movable contact 241; the movable spring piece 22, the holder piece 23 and the movable contact 24 of the second movable contact group 202 are respectively a second movable spring piece 222, a second holder piece 232 and a second movable contact 242; the contact working face of the first movable contact 241 of the first movable contact group 201 faces the insulating block 21, and the contact working face of the second movable contact 242 of the second movable contact group 202 faces away from the insulating block 21.

The supporting plate 23 is on the same side of the contact working surface of the movable contact 24, that is, the first supporting plate 231 is located between the first movable contact piece 221 and the insulating block 21, and the second movable contact piece 222 is located between the second supporting plate 232 and the insulating block 21. And the supporting sheets 23 are extended with bending parts 2301 corresponding to the elastic support arms 2201 of the movable spring pieces 22. The support plate 23 serves on the one hand to prevent vibration bridging and on the other hand to stabilize the movable spring 22.

Meanwhile, the insulating block 21 is provided with a concave part 211 which is arranged at a bending part 2301 of the supporting sheet (specifically, the first supporting sheet 231), so that the first supporting sheet 231 facing the insulating block 21 can be arranged, and under the condition that the size of the relay is not increased, two sets of movable contact modes can be realized, and the contact gap can be ensured.

Specifically, both sides of the insulating block 21 are provided with the concave portions 211, and the first movable contact group 21 can be abducted no matter which side is located, so that the assembly is convenient.

Specifically, the movable spring 22 is a U-shaped movable spring, and has two elastic support arms 2201, and the two elastic support arms 2201 are provided with the movable contact 24. I.e. there are two moving contacts 24 in each set of moving contacts. Meanwhile, the supporting sheet 23 is also a U-shaped supporting sheet, and has two supporting arms, both of which form a bending portion 2301 and respectively correspond to the two elastic supporting arms 2201 of the movable spring piece 22.

Further, in the first movable contact group 201, the first movable spring piece 221 is located at the outer side of the first supporting sheet 231, and the movable spring gasket 26 is further fixedly attached to the outer side of the first movable spring piece 221, so that the first movable spring piece 221 is more stable in fixation, and stability of contact pressure of a product is facilitated.

Specifically, the two movable contact sets are riveted and fixed on the insulating block through the rivet 25, and the assembly is simple and firm. Of course, other fixing methods such as bolt screwing and the like can be adopted for fixing in other embodiments.

Specifically, the insulation block 21 is provided with a convex rib 212 for isolating two sets of moving contact sets, so as to increase the creepage distance between the two sets of moving contact sets and improve the voltage withstanding capability of the product.

As shown in fig. 4, 7 and 8, the fixed contact part 30 includes a base 31, a pin 32, a connecting piece 33 and a fixed contact 34, the pin 32 is inserted into the base 31, the connecting piece 33 is fixed on the pin 32, and the fixed contact 34 is disposed on the connecting piece 33 to correspond to the contact working surface of the movable contact 24 of the movable contact part 20. Specifically, there are eight pins 32, and the number of the connecting pieces 33 is four, and the connecting pieces are connected to four of the pins 32 and respectively correspond to four movable contacts 24.

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

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A magnetic latching relay, comprising an electromagnetic system and a contact system, the electromagnetic system drives the contact system to switch between a self-retaining state in which the contacts are in contact and a reset state in which the contacts are separated by controlling the movement of its armature; It is characterized in that: it also includes a restoring reed, which is fixed on the electromagnetic system and extends with an elastic part whose rigidity is smaller than that of the moving reed of the contacting system, the elastic part is located between the armature and the contacting system, and extends along the armature and the contacting system. The width direction of the armature extends. In the return state, the elastic portion and the armature maintain a certain gap. When the armature is switched from the return state to the self-retaining state, the armature contacts the elastic portion and drives the elastic portion to deform.

2 . The magnetic latching relay according to claim 1 , wherein the restoring reed comprises: a fixing part, an adjusting part and the elastic part, the fixing part is fixed on the electromagnetic system, and the adjusting The fixing part and the elastic part are connected by a part, and the width of the adjusting part is smaller than that of the fixing part and larger than that of the elastic part.

3 . The magnetic latching relay according to claim 2 , wherein the restoring reed is in an “L” shape, comprising a vertical bar and a horizontal bar, and the fixing part is located on the vertical bar. 4 . The adjusting part is located at the lower part of the vertical rod, and the horizontal rod is the elastic part; the adjusting part is bent laterally so that the fixed part and the elastic part are staggered on the vertical plane.

4 . The magnetic latching relay according to claim 1 , wherein 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, which defines the The end of the elastic part connected with the adjusting part is 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 push rod contacts the elastic part of the restoring spring. free end.

5 . The magnetic latching relay according to claim 4 , wherein a convex rib for contacting the push rod is further protruded from the surface of the elastic portion, and the surface of the convex rib is an arc-shaped surface. 6 .

6 . The magnetic latching relay according to claim 4 , wherein the contact surface of the push rod for contacting the elastic portion is an arc-shaped contact surface. 7 .

7 . The magnetic latching relay according to claim 1 , wherein the contact system comprises a movable contact part connected to the armature of the electromagnetic system and hinged to the electromagnetic system in the middle and a stationary contact part corresponding to the movable contact part. 8 . The movable contact part includes an insulating block and two sets of movable contact groups fixed on the insulating block and arranged opposite to each other, the insulating block is connected to the armature, and the two groups of movable contact groups both include the movable reed, the sticker The supporting piece arranged on the movable reed and the movable contact arranged on the elastic support arm of the movable spring; The contact working surface of the point is on the same side, and a bent portion corresponding to the elastic support arm of the movable spring is extended, and the insulating block has a concave portion that gives way to the bent portion of the support plate.

8 . The magnetic latching relay according to claim 7 , wherein the two sets of movable contact groups are defined as a first movable contact group and a second movable contact group, and the movable contact of the first movable contact group The contact working surface of the second movable contact group faces the insulating block, and the contact working surface of the movable contact of the second movable contact group is away from the insulating block; the outer side of the movable spring of the first movable contact group is also fixedly attached There are moving spring washers.

9 . The magnetic latching relay according to claim 1 , wherein the electromagnetic system comprises a fixed frame, a first yoke, a second yoke, a third yoke, a permanent magnet, a self-retaining coil, and a return coil. 10 . , the iron core and the armature, the first yoke, the second yoke and the third yoke are arranged at intervals and fixed on the fixing frame, and the self-retaining coil and the return coil are arranged on the first yoke and the third yoke. Between the second yokes, the iron core is inserted into the self-retaining coil and the return coil, the permanent magnet steel is arranged between the second yoke and the third yoke, and the armature is hinged on the fixed frame, so The restoring spring is fixed on the outer side wall of the first yoke.

10 . The magnetic latching relay according to claim 9 , wherein the cross-section of the third yoke is an “L”-shaped structure, with transverse plates and vertical plates that are perpendicular to each other, and the bottom of the vertical plate is lateral to each other. 11 . A positioning boss for locating the permanent magnet steel protrudes, a limit boss for limiting the escape of the permanent magnet steel protrudes laterally from the top of the vertical plate, an opening for letting go is provided on the horizontal plate, and the first The bottom of the secondary yoke is provided with a boss, and the boss passes through the opening opening to correspond to the armature.