Double-contact magnetic latching relay

Abstract

The utility model provides a double-contact magnetic latching relay, and belongs to the technical field of relays. Aiming at the problem of poor reliability of single-contact contact of a movable reed in the prior art, the elastic part of the movable reed is divided into a plurality of mutually independent branches, each branch is provided with a movable contact, and the contact mode is adjusted from a single contact to a multi-contact mode, so that the contact opportunity of the contacts is increased, the contact reliability is improved, and the service life of the movable reed is prolonged. The heating phenomenon under large current can be effectively controlled; the push rod comprises a first push surface and a second push surface, and the distances between the first push surface and the plane where the elastic parts are located and the distances between the second push surface and the plane where the elastic parts are located are unequal, so that the actuation time of the two elastic parts under the action of the push rod is not synchronous and has a sequence, and the movable contact which is firstly actuated to be disconnected does not cause ablation. The moving contact which is disconnected after actuation is used as a sacrifice piece and is ablated, so that the contact stability of the moving contact which is disconnected firstly can be effectively improved, and the purpose of stabilizing the contact resistance is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of relays, and in particular relates to a double-contact magnetic latching relay. Background Art

[0002] The open and closed state of the contacts of the magnetic latching relay is maintained by the magnetic force generated by the permanent magnet. When the contacts of the relay need to be opened or closed (i.e., when the load is connected or disconnected), the coil is excited by a positive (negative) DC pulse voltage, and the relay completes the open and closed state conversion in an instant. Usually, when the contacts are in the holding state, the coil does not need to continue to be energized, and the magnetic force of the permanent magnet can maintain the state of the relay unchanged. The contacts are divided into moving contacts and static contacts. The moving contacts are set on the moving reed, and the static contacts are set on the connection terminals.

[0003] In related technologies, the moving reed adopts a single contact method, that is, each moving reed includes only one moving contact, which has the problem of poor contact reliability. After power is turned on, the surface of the moving contact is prone to burning, which leads to a large contact resistance. Under high current conditions, the temperature rise will be high, which will reduce the manganese copper sampling accuracy of the relay.

[0004] Therefore, it is necessary to provide a double-contact magnetic latching relay to solve the problems mentioned in the above background technology. Summary of the invention

[0005] The present application provides a double-contact magnetic latching relay. Aiming at the problem of poor contact reliability of a single contact adopted by a moving reed in the prior art, the elastic part of the moving reed is divided into a plurality of independent branches, and a moving contact is arranged on each branch, so that the contact mode is adjusted from a single contact to a multi-contact, thereby increasing the contact opportunities of the contacts, improving the contact reliability, and effectively controlling the heating phenomenon under large current; the push rod comprises a first push surface and a second push surface, and the first push surface and the second push surface are at different distances from the plane where the elastic part is located, so that under the action of the push rod, the actuation time of the two elastic parts is not synchronized, and there is a sequence of action, the moving contact that is actuated and disconnected first will not cause ablation, and the moving contact that is actuated and disconnected later acts as a sacrificial part and ablation occurs, which can effectively improve the contact stability of the moving contact that is disconnected first, and achieve the purpose of stabilizing the contact resistance.

[0006] In order to solve the above technical problems, the technical solution of this application is:

[0007] A double-contact magnetic latching relay, comprising:

[0008] A shell, enclosing a receiving space;

[0009] An actuating assembly is accommodated in the accommodating space, wherein the actuating assembly comprises a static spring sheet, a dynamic spring sheet and a push rod, wherein the static spring sheet is fixed to the housing, and the dynamic spring sheet comprises a fixed sheet and an elastic sheet, wherein the fixed sheet is fixed to the housing, one end of the elastic sheet is fixed to the fixed sheet, and the other end is suspended beside the static spring sheet; the elastic sheet comprises a fixed portion and at least two elastic portions arranged side by side, wherein one end of each elastic portion is fixed to the fixed portion, and the other end is suspended; a gap is maintained between two adjacent elastic portions, and each elastic portion is provided with a dynamic contact, and the static spring sheet is provided with a contact corresponding to the dynamic contact matching static contacts; the push rod includes a push portion, the push portion includes a first push portion and a second push portion, the first push portion and the second push portion are arranged at intervals on opposite sides of the moving spring piece, and the first push portion is located on the side of the moving spring piece where the moving contact is arranged, the first push portion includes a first push surface and a second push surface, the first push surface and the second push surface are respectively used to contact with the two elastic parts to apply driving force to the two elastic parts, the two push surfaces are located on different planes, and the first push surface and the second push surface are at different distances from the plane where the elastic part is located;

[0010] The driving assembly is accommodated in the accommodating space and is located beside the actuating assembly, and is used to drive the push rod to move along a first direction or a second direction, wherein the first direction is the direction in which the moving contact approaches the static contact, and the second direction is the direction in which the moving contact moves away from the static contact.

[0011] Preferably, the shell includes a base and a cover plate, the base encloses a receiving space with a top opening, the cover plate is sealed on the top opening of the base, and the cover plate is detachably connected to the base.

[0012] Preferably, the drive assembly includes a coil bracket, a coil, a yoke and an armature, the coil bracket is in an I-shape, including an iron core and two side plates arranged at both ends of the iron core to play a supporting role, the coil is sleeved on the iron core, the yoke is fixed to the side plates in a one-to-one correspondence and is connected to the iron core; the armature includes a main body, a pin shaft, a first cantilever and a second cantilever, the pin shaft is fixed to the upper and lower ends of the main body, the pin shaft is hinged to the shell and can rotate around its own axis, the first cantilever and the second cantilever are respectively arranged at the left and right ends of the main body, the number of the first cantilever and the number of the second cantilever are both two, the two first cantilevers are relatively spaced, the two second cantilevers are relatively spaced, one yoke is located between the two first cantilevers, and the other yoke is located between the two second cantilevers, and the push rod is fixed to the main body through a connecting piece.

[0013] Preferably, the push rod also includes a clamping portion and a connecting portion connecting the clamping portion and the push portion, the clamping portion is provided with a clamping slot, the connecting member is provided with a clamping block that cooperates with the clamping slot, and the clamping block is correspondingly clamped in the clamping slot, so that the push rod, the connecting member and the armature are connected and fixed.

[0014] Preferably, the first pushing surface is protruding relative to the second pushing surface, and the distance between the first pushing surface and the plane where the elastic portion is located is smaller than the distance between the second pushing surface and the plane where the elastic portion is located.

[0015] Preferably, the actuating assembly further comprises an auxiliary spring, wherein the auxiliary spring and the moving contact are located on opposite sides of the moving spring, and the auxiliary spring and the elastic part are arranged in one-to-one correspondence, and each of the auxiliary springs is fixed to the elastic part at one end and the other end is suspended at a distance beside the elastic part, and the suspended ends of the two auxiliary springs are connected to form a whole.

[0016] Preferably, the first pushing portion is located at a side of the moving reed where the moving contact is provided, and the second pushing portion is located at a side of the moving reed where the auxiliary reed is provided.

[0017] Preferably, it also includes a lead-out component, which includes a static spring lead-out piece, a movable spring lead-out piece and a terminal block, the static spring lead-out piece connects one of the static springs and one of the terminal blocks, the movable spring lead-out piece connects one of the movable springs and one of the terminal blocks, and the terminal block is connected to the line to be protected.

[0018] Preferably, a shielding cover is further included. The shielding cover adopts a U-shaped structure and is sleeved on the periphery of the shell to form a covering effect on the top surface, the bottom surface and one side surface of the shell to achieve the effect of preventing magnetic interference.

[0019] The beneficial effects of this application are:

[0020] (1) In view of the problem that the contact reliability of the movable spring piece using a single contact point is poor in the prior art, the elastic part of the movable spring piece is divided into multiple independent branches, and a movable contact point is provided on each branch, so that the contact mode is adjusted from a single contact point to multiple contacts, thereby increasing the contact opportunities of the contacts, improving the contact reliability, and effectively controlling the heating phenomenon under large current;

[0021] (2) The push rod includes a first push surface and a second push surface. The distances between the first push surface and the second push surface and the plane where the elastic part is located are different, so that the actuation time of the two elastic parts is not synchronized under the action of the push rod, and there is a sequence. The moving contact that is actuated and disconnected first will not cause ablation, and the moving contact that is actuated and disconnected later will act as a sacrificial part and ablation will occur, which can effectively improve the contact stability of the moving contact that is disconnected first, thereby achieving the purpose of stabilizing the contact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional structural diagram showing a double-contact magnetic latching relay provided by the present application;

[0023] Figure 2 express Figure 1 The connection diagram of the drive assembly, the actuating assembly and the lead-out assembly shown;

[0024] Figure 3 express Figure 2 An exploded schematic diagram of the connection structure shown;

[0025] Figure 4 A schematic diagram showing the connection between the push rod and the moving reed;

[0026] Figure 5 A schematic diagram showing the cooperation between the push rod and the elastic part;

[0027] Figure 6 A schematic diagram showing the structure of a shielding cover. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Please refer to Figure 1-Figure 6 The present application provides a double-contact magnetic latching relay 100 , including a housing 10 , a driving assembly 20 , an actuating assembly 30 , a lead-out assembly 40 and a shielding cover 50 .

[0030] The housing 10 includes a base 11 and a cover plate 12, wherein the base 12 encloses a receiving space with an opening at the top, and the cover plate 12 covers the top opening of the base 12, and the cover plate 12 is detachably connected to the base 11. In this embodiment, the cover plate 12 is connected to the base 11 by a buckle, and in other embodiments, the cover plate 12 and the base 11 can also be fixed by gluing.

[0031] The driving assembly 20 is installed in the receiving space and is located on the left side of the receiving space. The driving assembly 20 includes a coil support 21, a coil 22, a yoke 23 and an armature 24.

[0032] The coil support 21 is in an I-shape, including an iron core 211 and two side plates 212 arranged at both ends of the iron core 211 to support the coil 22. The coil 22 is sleeved on the iron core 211. The yoke 23 is fixed to the side plates 212 in a one-to-one correspondence and connected to the iron core 211.

[0033] The armature 24 includes a main body 241 , a pin 242 , a first cantilever 243 , and a second cantilever 244 .

[0034] The pin shaft 242 is fixed to the upper and lower ends of the main body 241 . The pin shaft 242 is hinged to the housing 10 . The pin shaft 242 can rotate around its own axis.

[0035] The first cantilever 243 and the second cantilever 244 are respectively arranged at the left and right ends of the main body 241, and the number of the first cantilever 243 and the second cantilever 244 are both two, the two first cantilevers 243 are relatively spaced apart, the two second cantilevers 244 are relatively spaced apart, one yoke 23 is located between the two first cantilevers 243, and the other yoke 23 is located between the two second cantilevers 244.

[0036] The coil 22 generates a magnetic field when energized. Under the action of the magnetic force, an attraction or repulsion effect is generated between the yoke 23 and the first cantilever 243 or the second cantilever 244, so that the armature 24 as a whole can rotate around the pin shaft 242. During the rotation process, the first cantilever 243 and the second cantilever 244 can play a limiting role, limiting the rotation angle of the armature 24, thereby controlling the propulsion distance of the actuator assembly 30.

[0037] The actuating assembly 30 includes a static spring 31 , a dynamic spring 32 , an auxiliary spring 33 and a push rod 34 .

[0038] The static spring piece 31 is fixed to the housing 10 , and the dynamic spring piece 32 includes a fixed piece 321 and an elastic piece 322 . The fixed piece 321 is fixed to the housing 10 , and one end of the elastic piece 322 is fixed to the fixed piece 321 , and the other end is suspended beside the static spring piece 31 .

[0039] The elastic sheet 322 includes a fixed portion 3221 and at least two elastic portions 3222 arranged side by side, each of the elastic portions 3222 is fixed to the fixed portion 3221 at one end and suspended at the other end; a gap is maintained between two adjacent elastic portions 3222, each of the elastic portions 3222 is provided with a moving contact 3223, and the static spring sheet 31 is provided with a static contact 311 matching the moving contact 3223.

[0040] The auxiliary spring piece 33 and the moving contact 3223 are located on opposite sides of the moving spring piece 32. The auxiliary spring piece 33 and the elastic part 3222 are arranged in a one-to-one correspondence. One end of each auxiliary spring piece 33 is fixed to the elastic part 3222, and the other end is suspended beside the elastic part 3222 at an interval. The suspended ends of the two auxiliary spring pieces 33 are connected to form a whole.

[0041] The push rod 34 is fixed to the armature 24 and is used to drive the movable spring 32 to move so that the movable contact 3223 is engaged with or disconnected from the static contact 311 .

[0042] Specifically, the push rod 34 is fixed to the main body 241 of the armature 24 through a connecting piece 245. When the armature 24 rotates, the push rod 34 is driven to rotate. Since the rotation angle of the armature 24 is generally small, the movement of the push rod 34 can be approximately regarded as a linear motion.

[0043] The pushing rod 34 includes a clamping portion 341 , a pushing portion 342 , and a connecting portion 343 connecting the clamping portion 341 and the pushing portion 342 .

[0044] The clamping portion 341 is provided with a clamping slot 3410 , and the connecting member 245 is provided with a clamping block 2450 that cooperates with the clamping slot 3410 . The clamping block 2450 is correspondingly clamped in the clamping slot 3410 , so that the push rod 34 , the connecting member 245 and the armature 24 are connected and fixed.

[0045] The pushing portion 342 includes a first pushing portion 3421 and a second pushing portion 3422. The first pushing portion 3421 and the second pushing portion 3422 are arranged at intervals, and the first pushing portion 3421 is located on the side of the movable spring piece 32 where the movable contact 3223 is arranged, and the second pushing portion 3422 is located on the side of the movable spring piece 32 where the auxiliary spring piece 33 is arranged.

[0046] When the relay is turned on, the driving assembly 20 drives the actuating assembly 30 to move in the first direction, the second pushing part 3422 correspondingly squeezes the auxiliary spring piece 33, and transmits the force to the moving spring piece 32 through the auxiliary spring piece 33, driving the moving spring piece 32 to move in the direction close to the static spring piece 31, so that the moving contact 3223 and the static contact 311 are in contact with each other; when the relay is turned off, the driving assembly 20 drives the actuating assembly 30 to move in the second direction, the first pushing part 3421 correspondingly squeezes the moving spring piece 32, driving the moving spring piece 32 to move in the direction away from the static spring piece 31, so that the moving contact 3223 and the static contact 311 are separated from each other. The first direction is the direction in which the moving contact 3223 approaches the static contact 311, and the second direction is the direction in which the moving contact 3223 moves away from the static contact 311.

[0047] The first pushing portion 3421 includes a first pushing surface 3423 and a second pushing surface 3424. The first pushing surface 3423 and the second pushing surface 3424 are respectively used to contact the two elastic portions 3222 to apply driving force to the two elastic portions 3222. The two pushing surfaces 3423 are located on different planes, and the first pushing surface 3423 and the second pushing surface 3424 are at different distances from the plane where the elastic portions 3222 are located.

[0048] In this embodiment, the first pushing surface 3423 is arranged to protrude relative to the second pushing surface 3424, so that the distance between the first pushing surface 3423 and the plane where the elastic part 3222 is located is smaller than the distance between the second pushing surface 3424 and the plane where the elastic part 3222 is located. When the second pushing part 3421 starts to drive the movable spring piece 32 to disconnect, since the movement distance of the first pushing surface 3423 is shorter, it will contact the elastic part 3222 earlier than the second pushing surface 3424, so that the two elastic parts 3222 are disconnected in sequence one after the other, and the phenomenon of contact ablation can be completely left to the elastic part 3222 that is disconnected later, which can effectively protect the contact on the elastic part 3222 that is disconnected first from ablation, thereby achieving the purpose of stabilizing the contact resistance.

[0049] The lead-out assembly 40 includes a static spring lead-out piece 41, a dynamic spring lead-out piece 42 and a terminal block 43. The static spring lead-out piece 41 connects one static spring 31 and one terminal block 43, and the dynamic spring lead-out piece 42 connects one dynamic spring 32 and one terminal block 43. The terminal block 43 is used to integrate the relay into the circuit.

[0050] Specifically, in this embodiment, the relay adopts a single-circuit form, including a static reed 31 and a dynamic reed 32, and two terminal blocks 43 are connected to the live wire, wherein the terminal block 43 connected to the static reed 31 serves as the input port of the live wire, and the terminal block 43 connected to the dynamic reed 32 serves as the output port of the live wire. In other embodiments, the relay can also adopt a dual-circuit form, wherein a static reed 31 and a dynamic reed 32 form a loop, wherein one loop is set on the live wire, and the other loop is set on the neutral wire.

[0051] The shielding cover 50 is used to play a magnetic shielding role to prevent the relay from being interfered by strong external magnetic fields. The shielding cover 50 adopts a U-shaped structure and is sleeved on the periphery of the housing 10 to form a covering effect on the top surface, bottom surface and one side surface of the housing 10. The material of the shielding cover 50 can be selected from conventional materials in the field, such as DT4A electromagnetic pure iron material.

[0052] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A double-contact magnetic latching relay, characterized in that: include: A shell, enclosing a receiving space; An actuating assembly is accommodated in the accommodating space, wherein the actuating assembly comprises a static spring sheet, a dynamic spring sheet and a push rod, wherein the static spring sheet is fixed to the housing, and the dynamic spring sheet comprises a fixed sheet and an elastic sheet, wherein the fixed sheet is fixed to the housing, one end of the elastic sheet is fixed to the fixed sheet, and the other end is suspended beside the static spring sheet; the elastic sheet comprises a fixed portion and at least two elastic portions arranged side by side, wherein one end of each elastic portion is fixed to the fixed portion, and the other end is suspended; a gap is maintained between two adjacent elastic portions, and each elastic portion is provided with a dynamic contact, and the static spring sheet is provided with a contact corresponding to the dynamic contact matching static contacts; the push rod includes a push portion, the push portion includes a first push portion and a second push portion, the first push portion and the second push portion are arranged at intervals on opposite sides of the moving spring piece, and the first push portion is located on the side of the moving spring piece where the moving contact is arranged, the first push portion includes a first push surface and a second push surface, the first push surface and the second push surface are respectively used to contact with the two elastic parts to apply driving force to the two elastic parts, the two push surfaces are located on different planes, and the first push surface and the second push surface are at different distances from the plane where the elastic part is located; The driving assembly is accommodated in the accommodating space and is located beside the actuating assembly, and is used to drive the push rod to move along a first direction or a second direction, wherein the first direction is the direction in which the moving contact approaches the static contact, and the second direction is the direction in which the moving contact moves away from the static contact.

2. The double-contact magnetic latching relay according to claim 1, characterized in that: The shell comprises a base and a cover plate, wherein the base encloses a receiving space with a top opening, and the cover plate is sealed on the top opening of the base, and the cover plate is detachably connected to the base.

3. The double-contact magnetic latching relay according to claim 1, characterized in that: The drive assembly includes a coil bracket, a coil, a yoke and an armature. The coil bracket is in an I-shape, including an iron core and two side plates arranged at both ends of the iron core to support the iron core. The coil is sleeved on the iron core. The yoke is fixed to the side plates in a one-to-one manner and connected to the iron core. The armature includes a main body, a pin shaft, a first cantilever and a second cantilever. The pin shaft is fixed to the upper and lower ends of the main body. The pin shaft is hinged to the shell and can rotate around its own axis. The first cantilever and the second cantilever are respectively arranged at the left and right ends of the main body. The number of the first cantilever and the second cantilever are both two. The two first cantilevers are relatively spaced, and the two second cantilevers are relatively spaced. One of the yokes is located between the two first cantilevers, and the other yoke is located between the two second cantilevers. The push rod is fixed to the main body through a connecting piece.

4. The double-contact magnetic latching relay according to claim 3, characterized in that: The push rod also includes a clamping portion and a connecting portion connecting the clamping portion and the push portion, the clamping portion is provided with a clamping slot, the connecting member is provided with a clamping block that cooperates with the clamping slot, and the clamping block is correspondingly clamped in the clamping slot, so that the push rod, the connecting member and the armature are connected and fixed.

5. The double-contact magnetic latching relay according to claim 1, characterized in that: The first pushing surface is protruding relative to the second pushing surface, and the distance between the first pushing surface and the plane where the elastic portion is located is smaller than the distance between the second pushing surface and the plane where the elastic portion is located.

6. The double-contact magnetic latching relay according to claim 1, characterized in that: The actuating assembly also includes an auxiliary spring, wherein the auxiliary spring and the moving contact are located on opposite sides of the moving spring, and the auxiliary springs are arranged in a one-to-one correspondence with the elastic part. Each of the auxiliary springs has one end fixed to the elastic part and the other end suspended at a distance beside the elastic part, and the suspended ends of the two auxiliary springs are connected to form a whole.

7. The double-contact magnetic latching relay according to claim 6, characterized in that: The first pushing portion is located at a side of the movable reed where the movable contact is arranged, and the second pushing portion is located at a side of the movable reed where the auxiliary reed is arranged.

8. The double-contact magnetic latching relay according to claim 1, characterized in that: It also includes a lead-out component, which includes a static spring lead-out piece, a movable spring lead-out piece and a terminal block. The static spring lead-out piece connects one of the static springs and the terminal block, and the movable spring lead-out piece connects one of the movable springs and the terminal block. The terminal block is connected to the line to be protected.

9. The double-contact magnetic latching relay according to claim 1, characterized in that: It also includes a shielding cover, which adopts a U-shaped structure and is sleeved on the periphery of the shell to form a covering effect on the top surface, the bottom surface and one side surface of the shell to prevent magnetic interference.

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