Strengthen contact signal relay

Abstract

The invention discloses a reinforced contact signal relay, comprising a base, a contact assembly and a magnetic circuit assembly are installed on the base, the contact assembly comprises a positioning piece, a contact limit bracket, an action push rod, a reinforced static contact piece, and a reinforced moving contact piece; the contact limit bracket is connected to the positioning piece, and the positioning piece, the reinforced moving contact piece, and the reinforced static contact piece are fixed on the base; the reinforced moving contact piece is connected to the action push rod, and the lower end of the action push rod is connected to the armature; a sheet-shaped arc-extinguishing magnetic steel structure is provided on both sides of each reinforced static contact, and the magnetic field directions of the two relatively arranged arc-extinguishing magnetic steel structures are different; a counterweight is provided on the lower surface of the armature, when the coil is energized, the armature and the coil are attracted, and the reinforced moving contact piece installed on the action push rod and the reinforced static contact piece on one side form a closed magnetic circuit; when the coil is de-energized, the armature and the coil are separated, and the relay is reset under the action of the weight of the counterweight. The invention can significantly shorten the arcing time and has excellent vibration resistance and stability.

Description

Technical Field

[0001] The invention relates to a relay, in particular to a reinforced contact signal relay. Background Art

[0002] Utility model patent CN212434552U discloses a new type of safety signal relay (hereinafter referred to as JWXC-1700-YH), which adopts a snap-on magnetic circuit structure, uses electromagnetic force to move the armature, drive the push rod shaft, and then drive the middle contact to complete the logic implementation of the moving contact. The gravity method is used to complete the logic implementation of its moving break contact.

[0003] The above-mentioned new safety signal relay includes the use of multiple sets of ordinary contacts, whose contact gap is small, cannot pass large currents, and has limited voltage resistance. In order to meet the needs of high current and high voltage circuits, a signal relay with a reinforced contact structure is required. In order to achieve a contact stroke with a larger contact gap, the magnetic gap of the armature in the reinforced contact signal relay needs to be increased, that is, the original armature angle needs to be changed, and the larger armature magnetic gap also requires a larger magnetic force to drive, so the electromagnetic attraction of the coil needs to be increased accordingly. Secondly, the reinforced contacts in the reinforced contact signal relay require a larger voltage and current, and the arcing phenomenon when the contacts are connected and disconnected is much stronger than that of ordinary contacts. Therefore, the reinforced contacts require external measures to help complete the realization of arc extinguishing. It can be seen that the reinforced contact signal relay needs to have excellent arc extinguishing ability and vibration resistance to cope with harsh application scenarios and ensure the safety and stability of the circuit. Summary of the invention

[0004] Purpose of the invention: In view of the problems existing in the prior art, the purpose of the present invention is to provide a reinforced contact signal relay with excellent arc extinguishing ability and strong vibration resistance.

[0005] Technical solution: A reinforced contact signal relay includes a base, a contact assembly and a magnetic circuit assembly are installed on the base, and the magnetic circuit assembly includes an armature, a yoke, and a coil;

[0006] The contact assembly comprises a positioning piece, a contact limit bracket, an action push rod, a double-row reinforced static contact piece, and a double-row reinforced moving contact piece. The contact limit bracket is connected to the positioning piece, and the positioning piece, the reinforced moving contact piece and the reinforced static contact piece are all fixed on the base; the action push rod is connected to the reinforced moving contact piece, and the lower end of the action push rod is connected to the armature; an arc-extinguishing magnetic steel bracket is installed on the contact limit bracket, and an arc-extinguishing magnetic steel structure is installed on the arc-extinguishing magnetic steel bracket. The arc-extinguishing magnetic steel structure is in the shape of a sheet, and an arc-extinguishing magnetic steel structure is provided on both sides of each reinforced static contact, and the magnetic field directions of the two arc-extinguishing magnetic steel structures arranged opposite to each other are different;

[0007] The armature includes a first movable end and a second movable end, wherein the first movable end is opposite to the yoke, and the second movable end is opposite to the coil; the action push rod is connected to the first movable end; a counterweight plate is provided on the lower surface of the first movable end, and a counterweight stop nail is provided on the yoke;

[0008] When the coil is energized, the second movable end and the coil are attracted, and the first movable end moves with the second movable end, pushing the action push rod. The reinforced movable contact piece installed on the action push rod and the reinforced static contact piece on one side form a closed magnetic circuit; when the coil is de-energized, the second movable end and the coil are separated, and the first movable end moves under the action of the gravity of the counterweight plate, and the contact separation is controlled by the action push rod.

[0009] Furthermore, the yoke is provided with a reset assembly, which includes a first elastic member and a second elastic member, the first elastic member abuts against the second elastic member, exerts downward pressure on the second elastic member, one end of the second elastic member is fixed to the yoke, and the other end is connected to the first movable end / weight plate. Preferably, the weight plate is arranged at the end of the first movable end, and a connecting member is provided on one side of the weight plate, and a hole / groove adapted to the second elastic member is opened on the connecting member; the second elastic member is connected to the first movable end through the hole / groove.

[0010] Furthermore, the first elastic member is a spring, the upper end of which is fixed, and the bottom end of which is against the second elastic member. The reset assembly includes a connecting rod, which is installed on the yoke and used to fix the spring. The second elastic member is a spring; the connecting rod passes through the first movable end and the spring in sequence and is fixed on the yoke.

[0011] Furthermore, the reset assembly also includes a gasket, which is sleeved on the connecting rod, and the bottom end of the spring is pressed against the spring through the gasket.

[0012] Furthermore, the positioning piece is U-shaped.

[0013] Furthermore, a bracket is provided on the yoke, and the upper end of the contact limiting bracket is connected to the positioning piece, and the lower end is installed on the bracket.

[0014] Furthermore, the arc-extinguishing magnetic steel structure is made of neodymium iron boron.

[0015] Beneficial effects:

[0016] The present invention has the following advantages: 1. Arc extinguishing ability: The arc extinguishing magnetic steel can provide a sufficient and stable magnetic field, effectively preventing the phenomenon of arc failure, thereby greatly improving the arc extinguishing stability. Under the condition of DC220V, 5A, the arc burning time is 6-8ms, and the arc extinguishing time is significantly shortened compared with the prior art. 2. Vibration resistance: The arc extinguishing magnetic steel is not directly fixed on the top of the contact spring, but is fixed in a split installation manner, which greatly reduces the inertial swing amplitude during vibration and greatly reduces the contact bounce time. Under the preferred embodiment, the amplitude can be stabilized at 0.5mm, and there is no contact bounce at 0-36Hz, and the contact bounce time is 10-15ms, which ensures the reliability of the system; it inherits the existing safety relay gravity + elastic force recovery method, and by changing the position of the compression spring, the point of action of the elastic force is greatly optimized, and the recovery action of the signal relay is more reliable and stable. 3. Stability: The cantilever limit card method is improved to a closed limit card method, and the overall structure is more stable and reliable. 4. Modular design: Each module is independent and does not interfere with each other, making installation and maintenance easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 yes Figure 1 A top view of

[0019] Figure 3 It is a schematic diagram of the arrangement of the arc-extinguishing magnetic steel structure;

[0020] Figure 4 It is a proportional gravity + elastic recovery method;

[0021] Figure 5 This is the gravity+elastic force recovery method of Example 2. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below in conjunction with the embodiments and drawings.

[0023] Embodiment 1:

[0024] A reinforced contact signal relay includes a base 1, on which a contact assembly and a magnetic circuit assembly are installed, the magnetic circuit assembly includes an armature 31, a yoke 32, a coil 33, and a static iron core 34; the contact assembly includes a positioning piece 21, a contact limit bracket 22, an action push rod 23, a double-row reinforced static contact piece 24, a double-row reinforced moving contact piece 25, a double-row static contact piece 27, and a double-row moving contact piece 28. The positioning piece 21, the reinforced moving contact piece 25, the reinforced static contact piece 24, the static contact piece 27, and the moving contact piece 28 are all horizontally fixed on the base 1, and the upper end of the contact limit bracket 22 is connected to the positioning piece 21, and the lower end is installed on the bracket 8. Each reinforced moving contact piece 25 is correspondingly configured with a pair of reinforced static contact pieces 24 above and below, the end of the reinforced moving contact piece 25 is a reinforced moving contact 241, and the end of the reinforced static contact piece 24 is a reinforced static contact 251; the reinforced moving contact piece 25 is connected to the action push rod 23, and the lower end of the action push rod 23 is connected to the armature 31; the contact limit bracket 22 is equipped with a U-shaped arc-extinguishing magnetic steel bracket 221, and a plurality of sheet-shaped arc-extinguishing magnetic steels 26 are installed on the arc-extinguishing magnetic steel bracket 221.

[0025] Specifically, an arc-extinguishing magnetic steel 26 is provided on each side of each reinforced static contact, and the magnetic field directions of the two arc-extinguishing magnetic steels 26 arranged opposite to each other are different; the size of this embodiment is 5mm*10mm, the thickness is 1mm, the arc-extinguishing magnetic steel 26 is installed on the arc-extinguishing magnetic steel bracket 221, and the arc-extinguishing magnetic steel bracket 221 is installed on the contact limit bracket 22. The direction of the magnetic field passes through the reinforced static contact and is tangent to the direction of the arc generated when the contact is disconnected. The material of the arc-extinguishing magnetic steel structure 26 is preferably neodymium iron boron. The arc-extinguishing magnetic steel made of neodymium iron boron has a field strength that is 20% higher than that of existing relays. Combined with the fixing method of the magnetic steel, it can provide a sufficient and stable magnetic field.

[0026] The new safety signal relay disclosed in utility model patent CN212434552U includes 8 groups of ordinary contacts. Compared with the prior art, the number and type of contacts of the reinforced contact signal relay are different, and the number is reduced compared with 8 groups of contacts. The reinforced contact signal relay consists of 2 groups of ordinary contacts and 2 groups of reinforced contacts (symmetrically arranged on both sides of the action push rod 23). Because the reinforced contacts need to pass a larger current than ordinary contacts and withstand a larger contact on-off voltage, the shrapnel of the reinforced contacts is thicker than that of ordinary contacts, the contact gap is larger than that of ordinary contacts, and the contact pressure is also greater than that of ordinary contacts.

[0027] The above structure can be seen Figure 1The armature 31 is placed under the contact assembly in an inverted L shape, and consists of a first movable end 311 and a second movable end 312, and the first movable end 311 and the second movable end 312 are rigidly connected. The first movable end 311 and the yoke 32 are horizontally opposed, and the second movable end 312 and the static iron core 34 are opposed; the action push rod 23 and the first movable end 311 are rigidly connected; the lower surface of the first movable end 311 is provided with a counterweight plate 4, and the yoke 32 is provided with a counterweight stop nail 5.

[0028] Working principle: when the coil 33 is energized, the second movable end 312 and the static iron core 34 are attracted, and the first movable end 311 moves with the second movable end 312, pushing the action push rod 23, and the second movable end 312 overcomes the gravity of the counterweight plate 4 and moves upward, strengthening the movable contact of the movable contact plate 25 to connect with the upper strengthened static contact, completing the logical implementation of the movable contact; when the coil 33 loses power, the second movable end 312 and the static iron core 34 are separated, and the first movable end 311 moves under the action of the gravity of the counterweight plate 4, and controls the strengthened movable contact downward through the action push rod 23, completing the logical implementation of the movable break contact.

[0029] Embodiment 2:

[0030] Based on the first embodiment, this embodiment provides a reset method combining elastic force and gravity to further optimize the anti-vibration performance of the relay. Figure 1 In the figure, a reset assembly is installed on the yoke 32, and the reset assembly includes a first elastic member 62 and a second elastic member 64. The first elastic member 62 resists the second elastic member 64 and applies downward pressure to the second elastic member 64. One end of the second elastic member 64 is fixed on the yoke 32, and the other end is connected to the first movable end 311.

[0031] Preferably, the first elastic member 62 is a spring, the second elastic member 64 is a spring sheet, and the reset assembly further includes a connecting rod 61 and a gasket 63. The connecting rod 61 passes through the first movable end 311 and the spring sheet in sequence and is fixed to the upper surface of the second movable end 312. The spring and the gasket 63 are sleeved on the connecting rod 61, the upper end of the spring is fixed by a nut, and the lower end presses the gasket 63 and then presses against the spring sheet. In order to achieve a better reset effect, the counterweight plate 4 is installed at the end of the first movable end 311, and a connecting member 7 is provided on the first movable end 311, and a hole / groove is opened on the connecting member 7; the spring sheet is arranged along the yoke 32, and the end of the spring sheet is inserted into the hole / groove to achieve connection with the first movable end 311.

[0032] Further preferably, the positioning piece 21 is U-shaped, a bracket 8 is provided on the yoke 32, the bracket 8 is connected to the contact limiting bracket 22, and the positioning piece 21, the contact limiting bracket 22, the bracket 8, the yoke 32, and the base 1 constitute a closed support loop.

[0033] The utility model patent CN212434552U is used as a comparative example below for comparison with Example 2 of the present invention.

[0034] Figure 4 It is a compression spring type recovery method of utility model patent CN212434552U, where the elastic force acts on one side of the first movable end and the gravity acts on the other side of the first movable end. Figure 5 In the embodiment, the pressure of the first elastic member (spring) is combined with gravity through the spring sheet, and the pressure action point is close to gravity, so that the torque of the pressure is closer to the reaction torque that needs to be overcome, and better anti-inertial swing amplitude can be achieved in a vibration environment (the inertia is caused by the counterweight sheet, and the direction is opposite to the direction of gravity). The structure of this embodiment can make the contact mode when the contacts are closed more reliable, and also make the recovery action of the signal relay more stable.

[0035] In summary, the reinforced contact relay of the present invention uses a snap-on magnetic circuit structure, uses electromagnetic force to move the armature, drives the middle contact, and is used to complete the logic implementation with the make contact and break contact. Since the voltage and current of the reinforced contact are larger (reinforced contact 380V, 5A, ordinary contact 24V, 1A), the arcing phenomenon when the contact is connected and disconnected is much stronger than that of ordinary contacts. The present invention adopts a miniaturized and lightweight design concept, and proposes to use a permanent magnet magnetic blowing method to extinguish the arc, and uses a magnetic sheet arc extinguishing magnetic steel as its permanent magnet for magnetic blowing. In actual configuration, if the arc extinguishing magnetic steel is directly fixed at the end of the contact spring, the arc extinguishing magnetic steel has a large swing amplitude when the relay is in action due to its large weight, which is not conducive to its arc extinguishing and contact contact stability.

[0036] Based on this, the present application adopts a contact limit bracket, an arc extinguishing magnetic steel bracket on the contact limit bracket, and the contact limit bracket and the yoke are rigidly fixed, so that the overall structure is more solid and reliable; the arc extinguishing magnetic steel is installed on the arc extinguishing magnetic steel bracket in a split manner, which can reduce the inertial swing amplitude during vibration, so that the contact bounce performance and anti-vibration performance are greatly improved. Preferably, the arc extinguishing magnetic steel is made of neodymium iron boron, which can provide a sufficient and stable magnetic field.

Claims

1. A reinforced contact signal relay, comprising a base (1), a contact assembly and a magnetic circuit assembly being mounted on the base (1), the magnetic circuit assembly comprising an armature (31), a yoke (32), and a coil (33), characterized in that: The contact assembly comprises a positioning piece (21), a contact limiting bracket (22), an action push rod (23), a double-row reinforced static contact piece (24), and a double-row reinforced moving contact piece (25); the contact limiting bracket (22) is connected to the positioning piece (21); the positioning piece (21), the reinforced moving contact piece (25), and the reinforced static contact piece (24) are all fixed on the base (1); the action push rod (23) is connected to the reinforced moving contact piece (25); the lower end of the action push rod (23) is connected to the armature (31); an arc-extinguishing magnetic steel bracket (221) is mounted on the contact limiting bracket (22); an arc-extinguishing magnetic steel structure (26) is mounted on the arc-extinguishing magnetic steel bracket (221); the arc-extinguishing magnetic steel structure (26) is in the form of a sheet; an arc-extinguishing magnetic steel structure (26) is provided on each side of each reinforced static contact; and the magnetic fields of the two arc-extinguishing magnetic steel structures (26) arranged opposite to each other have different directions; The armature (31) comprises a first movable end (311) and a second movable end (312), wherein the first movable end (311) and the yoke (32) are opposite to each other, and the second movable end (312) and the coil (33) are opposite to each other; the action push rod (23) is connected to the first movable end (311); a counterweight plate (4) is provided on the lower surface of the first movable end (311), and a counterweight stop nail (5) is provided on the yoke (32); When the coil (33) is energized, the second movable end (312) and the coil (33) are attracted, and the first movable end (311) moves along with the second movable end (312), pushing the action push rod (23), and the reinforced movable contact piece (25) installed on the action push rod (23) and the reinforced static contact piece (24) on one side form a closed magnetic circuit; when the coil (33) is de-energized, the second movable end (312) and the coil (33) are separated, and the first movable end (311) moves under the action of the gravity of the weight plate (4), and the contact separation is controlled by the action push rod (23); The yoke (32) is provided with a reset assembly, the reset assembly comprising a first elastic member (62) and a second elastic member (64), the first elastic member (62) abutting against the second elastic member (64) to apply downward pressure to the second elastic member (64), one end of the second elastic member (64) is fixed to the yoke (32), and the other end is connected to the first movable end (311) / the weight plate (4); the first elastic member (62) is a spring, the upper end of which is fixed, and the bottom end of which abuts against the second elastic member (64); the reset assembly comprises a connecting rod (61), the connecting rod (61) is mounted on the yoke (32), and is used to The fixing spring is provided; the second elastic member (64) is a spring sheet; the connecting rod (61) passes through the first movable end (311) and the spring sheet in sequence and is then fixed to the yoke (32); the reset assembly further comprises a gasket (63), the gasket (63) is sleeved on the connecting rod (61), and the bottom end of the spring is pressed against the spring sheet through the gasket (63); the counterweight plate (4) is provided at the end of the first movable end (311), a connecting member (7) is provided on one side of the counterweight plate (4), and a hole / groove adapted to the second elastic member (64) is provided on the connecting member (7); the second elastic member (64) is connected to the first movable end (311) through the hole / groove.

2. The reinforced contact signal relay according to claim 1, characterized in that: The positioning piece (21) is U-shaped.

3. The reinforced contact signal relay according to claim 2, characterized in that: A bracket (8) is provided on the yoke (32); the upper end of the contact limit bracket (22) is connected to the positioning piece (21), and the lower end is mounted on the bracket (8).

4. The reinforced contact signal relay according to claim 2 or 3, characterized in that: The arc-extinguishing magnetic steel structure (26) is made of neodymium iron boron.

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