CN110335784B - Double-coil multi-contact electromagnetic relay - Google Patents
Double-coil multi-contact electromagnetic relay Download PDFInfo
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- CN110335784B CN110335784B CN201910662563.XA CN201910662563A CN110335784B CN 110335784 B CN110335784 B CN 110335784B CN 201910662563 A CN201910662563 A CN 201910662563A CN 110335784 B CN110335784 B CN 110335784B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/44—Magnetic coils or windings
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Abstract
The invention relates to the technical field of relays, in particular to a double-coil multi-contact electromagnetic relay, which comprises an electromagnet assembly, a contact assembly and a pushing assembly which is movably arranged, wherein the electromagnet assembly drives the contact assembly to be connected or disconnected through the pushing assembly; the electromagnet assembly comprises a starting coil, a holding coil and a control module, wherein the starting coil and the holding coil are arranged in parallel, and the control module regulates and controls the on-off of the starting coil and a power supply; when the relay starts to work, the control module controls the starting coil to be conducted with the power supply, the starting coil and the holding coil are arranged in parallel, the equivalent resistance value of the two coils is reduced, the starting power of the relay is increased, the ferromagnetic attraction force is generated, the response efficiency of the relay is improved, and the design of a large stroke is met; after the contact assembly is attracted, the control module disconnects the starting coil from the power supply, the current limiting is carried out on the holding coil, the holding coil can enable the contact assembly to be in an attracted state only by low power, and the energy saving purpose is achieved.
Description
Technical Field
The invention relates to the technical field of relays, and particularly discloses a double-coil multi-contact electromagnetic relay.
Background
The relay is one of common accessories of various intelligent control equipment, in the use process of the relay, on one hand, the size of the relay is required to be smaller and smaller, on the other hand, the relay is required to have a large-stroke design to meet the safety required by circuit isolation, and in the prior art, the relay with the large-stroke design needs a large-power driving force, and the relay maintains a large-power state for a long time to cause waste of electric energy; the low-power driving of the relay cannot meet the design requirement of the large stroke of the relay, and the safety of the circuit isolation of the small-stroke relay cannot be fully ensured.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the double-coil multi-contact electromagnetic relay, which improves the response efficiency of the relay and satisfies the large-stroke design, and only needs small power to enable the contact assembly to be in a suction holding state so as to achieve the purpose of saving electric energy.
In order to achieve the above purpose, the double-coil multi-contact electromagnetic relay of the invention comprises an electromagnet assembly, a contact assembly and a pushing assembly which is movably arranged, wherein the contact assembly comprises a main contact unit and an auxiliary contact unit, the electromagnet assembly is used for driving the pushing assembly to move, and the moving pushing assembly drives the main contact unit and the auxiliary contact unit to be connected or disconnected; the electromagnet assembly comprises a starting coil, a holding coil and a control module, wherein the starting coil and the holding coil are arranged in parallel, the resistance value of the starting coil is smaller than that of the holding coil, an external power supply is used for supplying power to the starting coil and the holding coil, and the control module is used for regulating and controlling the connection or disconnection of the starting coil and the power supply.
Further, the contact assembly further comprises a fixing frame, and the main contact unit comprises two main contacts arranged on the fixing frame; the auxiliary contact unit comprises at least two first auxiliary contacts and at least two conductive sheets, wherein the first auxiliary contacts are arranged on the fixing frame, the first auxiliary contacts correspond to the conductive sheets one by one, the conductive sheets are provided with elastic clamps, the first auxiliary contacts are provided with conductive parts inserted into the elastic clamps, and the elastic clamps clamp the conductive parts; the pushing component is provided with a push rod unit which is movably arranged, the push rod unit is provided with a movable point block and a pushing piece, the movable point block is used for conducting two main contacts, and the pushing piece is used for driving the first conducting piece to conduct or disconnect the second conducting piece.
Further, the fixing frame comprises a ceramic shell, an insulator and a first screw, wherein the main contact and the first auxiliary contact are welded on the ceramic shell, the first screw is used for fixing the conducting strip on the insulator, the insulator is provided with a first blind hole for accommodating the elastic clamp and the guide connection part, and the inner hole wall of the first blind hole is used for stopping the limiting elastic clamp.
Further, the first pair of contacts is provided with a main body part connected with the guide connection part, the outer diameter of the main body part is larger than that of the guide connection part, the end face, close to one end of the guide connection part, of the main body part is used for abutting against the outer surface of the ceramic shell, the guide connection part penetrates through the ceramic shell and stretches into the elastic clamp, and the free end of the guide connection part is provided with a guide inclined surface which is convenient to stretch into the elastic clamp.
Further, the electromagnetic relay further comprises an insulating shell, an insulating cover body and a second screw, wherein the insulating shell is provided with a second blind hole for accommodating the electromagnet assembly, the contact assembly and the pushing assembly, the second screw is used for fixing the insulating cover body on the insulating shell, the insulating cover body covers the opening of the second blind hole and is used for packaging the electromagnet assembly, the contact assembly and the pushing assembly in the second blind hole, and the main contact protrudes out of the insulating cover body; the auxiliary contact unit further comprises at least two second auxiliary contacts and at least two wires, the first auxiliary contacts, the conductive plates, the second auxiliary contacts and the wires are in one-to-one correspondence, two ends of each wire are welded to the first auxiliary contacts and the second auxiliary contacts respectively, and the second auxiliary contacts are arranged on the insulating shell or/and the insulating cover body and protrude out of the insulating cover body.
Further, the first auxiliary contact and the second auxiliary contact comprise a first concave hole and a second concave hole communicated with the first concave hole, the first concave hole is concavely formed from the end face of the auxiliary contact, the second concave hole is concavely formed from the side surface of the auxiliary contact, the lead is accommodated in the first concave hole, and external soldering tin enters the first concave hole through the second concave hole so as to weld the lead on the auxiliary contact.
Further, the insulator is provided with a first blind groove and a second blind groove concavely arranged from the inner side wall of the first blind groove, the side wall of the conducting strip is provided with a convex fin in a protruding mode, the first blind groove is used for accommodating the conducting strip, and the second blind groove is used for accommodating the convex fin.
Further, the control module comprises an insulating support, a control circuit board and a third screw, wherein the electromagnet assembly is provided with a positioning hole, the insulating support is provided with a positioning column protruding into the positioning hole, the third screw is used for fixing the control circuit board on the insulating support, the insulating support is provided with a third blind groove for accommodating the control circuit board, and the control circuit board is used for regulating and controlling the connection or disconnection of the starting coil and the power supply.
Further, the push rod unit further comprises a push rod piece, an insulating sliding block, a reset spring, an overtravel spring and an armature, wherein the insulating sliding block is arranged at one end of the push rod piece in a sliding mode, the movable point block is arranged at the insulating sliding block, the overtravel spring is sleeved on the outer side of the push rod piece, the push piece is arranged on the push rod piece, two ends of the overtravel spring respectively abut against the insulating sliding block and the push piece, the reset spring is sleeved on the outer side of the push rod piece, the armature is arranged at the other end of the push rod piece, and two ends of the reset spring respectively abut against the armature and the electromagnet assembly.
Further, the control module is provided with a control circuit, a power supply is applied to the starting coil through the control circuit, the control circuit comprises a first resistor, a first capacitor, a second resistor, a first diode, an MOS tube, a second diode, a second capacitor and a third resistor, the first capacitor, the second resistor and the MOS tube are arranged in series to form a main circuit, the power supply is applied to the starting coil through the main circuit, the positive electrode of the first diode is grounded, a conduction position between the first resistor and the first capacitor is conducted with the negative electrode of the first diode, the second diode and the third resistor are connected in series to form a secondary circuit, the second capacitor is connected with the second diode in parallel, the second capacitor is connected with the third resistor in parallel, the conduction position between the second resistor and the MOS tube is conducted with one end of the third resistor, and the other end of the third resistor is grounded.
The invention has the beneficial effects that: when the relay starts to work, the control module controls the starting coil to be conducted with the power supply, the starting coil and the holding coil are arranged in parallel, the equivalent resistance value of the two coils is reduced, the starting power of the relay is increased, the ferromagnetic attraction force is generated, the response efficiency of the relay is improved, and the design of a large stroke is met; after the contact assembly is attracted, the control module disconnects the starting coil from the power supply, the current limiting is carried out on the holding coil, the holding coil can enable the contact assembly to be in an attracted state only by low power, and the energy saving purpose is achieved.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic diagram of an exploded construction of the present invention;
FIG. 3 is a schematic exploded view of an electromagnet assembly according to the present invention;
fig. 4 is a schematic perspective view of a conductive sheet, a first sub-contact, an insulator and a first screw according to the present invention;
fig. 5 is a schematic perspective view of a conductive sheet according to the present invention;
fig. 6 is a circuit diagram of a control circuit of the present invention.
The reference numerals include:
1-electromagnet assembly 2-contact assembly 3-pushing assembly
4-start coil 5-hold coil 6-control module
7-main contact 8-first auxiliary contact 9-conducting strip
11-spring clip 12-guide connection 13-push rod unit
14-moving point block 15-pushing piece 16-ceramic shell
17-insulator 18-first screw 19-first blind hole
21-main body 22-guiding inclined plane 23-insulating shell
24-insulating cover 25-second screw 26-second blind hole
27-second auxiliary contact 28-non-circular portion 29-first concave hole
31-second concave hole 32-first blind groove 33-second blind groove
34-raised fins 35-insulating supports 36-control circuit board
37-third screw 38-third blind slot 39-over travel spring
41-first clip 42-second clip 43-first tab
44-second flap 45-third flap.
Detailed Description
The present invention will be further described with reference to examples and drawings, which are not intended to be limiting, for the understanding of those skilled in the art.
Referring to fig. 1 to 4, the dual-coil multi-contact electromagnetic relay of the present invention includes an electromagnet assembly 1, a contact assembly 2 and a movable pushing assembly 3, wherein the contact assembly 2 includes a main contact unit and an auxiliary contact unit, the electromagnet assembly 1 is used for driving the pushing assembly 3 to move, and the movable pushing assembly 3 drives the main contact unit and the auxiliary contact unit to be turned on or off.
The electromagnet assembly 1 comprises a starting coil 4, a holding coil 5 and a control module 6, wherein the starting coil 4 and the holding coil 5 are arranged in parallel, the resistance value of the starting coil 4 is smaller than that of the holding coil 5, preferably, the resistance value of the holding coil 5 is 10-1000 times that of the starting coil 4, an external power supply source is used for supplying power to the starting coil 4 and the holding coil 5, and the control module 6 is used for regulating the connection or disconnection of the starting coil 4 and a power supply source.
When the relay starts to work, the control module 6 controls the starting coil 4 to be conducted with the power supply, and as the starting coil 4 and the holding coil 5 are arranged in parallel, the equivalent resistance value of the two coils is greatly reduced, and on the premise that the voltage value of the two coils is unchanged, the starting power of the relay is greatly increased by the power supply, so that the electromagnet assembly 1 generates strong magnetic attraction force which drives the armature of the electromagnetic relay to move quickly, the response efficiency of the relay is improved, and the design of large stroke is met; after the contact assembly 2 is attracted, the control module 6 disconnects the starting coil 4 from the power supply, the large resistance of the holding coil 5 limits the current of the circuit, and the holding coil 5 can enable the contact assembly 2 to be in an attracted maintenance state only by small power, so that the purpose of saving electric energy is achieved.
The contact assembly 2 further comprises a fixing frame, the main contact unit comprises two main contacts 7 arranged on the fixing frame, and the driving assembly is used for conducting the two main contacts 7; the auxiliary contact unit comprises at least two first auxiliary contacts 8 and at least two conducting strips 9 which are arranged on the fixing frame, the first auxiliary contacts 8 are in one-to-one correspondence with the conducting strips 9, the conducting strips 9 are provided with elastic clamps 11, the first auxiliary contacts 8 are provided with conducting parts 12 which are inserted into the elastic clamps 11, and the elastic clamps 11 clamp the conducting parts 12.
The first terminal is clamped by elastic deformation of the elastic clamp 11, so that the conductive sheet 9 and the first auxiliary contact 8 are prevented from being separated from each other due to collision or vibration of the electromagnetic relay, and conduction stability between the conductive sheet 9 and the first auxiliary contact 8 is ensured.
The pushing component 3 is provided with a push rod unit 13 which is movably arranged, the push rod unit 13 is provided with a movable point block 14 and a push plate 15, the movable point block 14 is made of conductive metal materials, the movable point block 14 is used for contacting and conducting two main contacts 7, and the two main contacts 7 are conducted through the movable point block 14; the push plate 15 is used for driving the first conductive plate 9 to conduct or break the second conductive plate 9, so as to conduct or break between the two first auxiliary contacts 8.
The fixing frame comprises a ceramic shell 16, an insulator 17 and a first screw 18, wherein the main contact 7 and the first auxiliary contact 8 are welded on the ceramic shell 16, the movable point block 14 and the push plate 15 are positioned in the ceramic shell 16, the first screw 18 is used for fixing the conducting strip 9 on the insulator 17, the connection strength between the conducting strip 9 and the insulator 17 is improved, and the conducting strip 9 and the insulator 17 are prevented from being loosened and cannot be normally used.
The insulator 17 is provided with a first blind hole 19 for accommodating the elastic clamp 11 and the guide connection part 12, the first blind hole 19 is concavely formed from the top surface of the insulator 17, and the inner hole wall of the first blind hole 19 is used for stopping the limiting elastic clamp 11. The bottom wall of the first blind hole 19 is used for stopping the elastic clamp 11, so that after the first auxiliary contact 8 is inserted into the elastic clamp 11, the first auxiliary contact 8 is prevented from being excessively inserted due to excessive downward deformation of the elastic clamp 11, and the conduction yield between the first auxiliary contact 8 and the conductive sheet 9 is improved.
The first auxiliary contact 8 has a main body portion 21 connected with the conductive connection portion 12, the first auxiliary contact 8 is in an integral structure, the outer diameter of the main body portion 21 is larger than that of the conductive connection portion 12, the main body portion 21 and the conductive connection portion 12 are both approximately cylindrical, the end face of the main body portion 21, which is close to one end of the conductive connection portion 12, is used for abutting against the outer surface of the ceramic shell 16, the first auxiliary contact 8 is prevented from being excessively installed into the ceramic shell 16, and the installation yield between the first auxiliary contact 8 and the ceramic shell 16 is improved.
The guide connection part 12 penetrates through the ceramic shell 16 and extends into the elastic clamp 11, a guide inclined surface 22 which is convenient to extend into the elastic clamp 11 is arranged at the free end of the guide connection part 12, and the installation efficiency between the guide connection part 12 and the elastic clamp 11 is improved through the arrangement of the guide inclined surface 22. In this embodiment, the guiding inclined surface 22 is a conical surface.
The electromagnetic relay further comprises an insulating shell 23, an insulating cover 24 and a second screw 25, wherein the insulating shell 23 is provided with a second blind hole 26 for accommodating the electromagnet assembly 1, the contact assembly 2 and the pushing assembly 3, the electromagnet assembly 1 is clamped between the contact assembly 2 and the bottom wall of the second blind hole 26, the pushing assembly 3 is arranged between the electromagnet assembly 1 and the contact assembly 2, the second screw 25 is used for fixing the insulating cover 24 on the insulating shell 23, the connection strength between the insulating cover 24 and the insulating shell 23 is enhanced, and the electromagnet assembly and the contact assembly are prevented from being separated from each other due to collision or vibration.
The insulating cover body 24 covers the opening of the second blind hole 26 and is used for packaging the electromagnet assembly 1, the contact assembly 2 and the pushing assembly 3 in the second blind hole 26, the electromagnet assembly 1, the contact assembly 2 and the pushing assembly 3 are not required to be fixedly connected, and the installation efficiency and the maintenance convenience of the electromagnetic relay are improved.
The main contact 7 protrudes out of the insulating cover 24, the auxiliary contact unit further comprises at least two second auxiliary contacts 27 and at least two wires, the first auxiliary contact 8, the conductive sheet 9, the second auxiliary contacts 27 and the wires are in one-to-one correspondence, two ends of each wire are respectively welded on the first auxiliary contact 8 and the second auxiliary contact 27, and the second auxiliary contact 27 is arranged on the insulating shell 23 or/and the insulating cover 24 and protrudes out of the insulating cover 24. Preferably, the second auxiliary contact 27 has a non-circular portion 28, the insulating housing 23 has a non-circular hole for accommodating the non-circular portion 28, and an inner hole wall of the non-circular hole stops against the non-circular portion 28 to prevent relative rotation between the second auxiliary contact 27 and the insulating housing 23.
The first auxiliary contact 8 and the second auxiliary contact 27 respectively comprise a first concave hole 29 and a second concave hole 31 communicated with the first concave hole 29, the first concave hole 29 is formed by concavely arranging the end face of the auxiliary contact, the second concave hole 31 is formed by concavely arranging the side surface of the auxiliary contact, the lead is accommodated in the first concave hole 29, external soldering tin enters the first concave hole 29 through the second concave hole 31 so as to weld the lead on the auxiliary contact, the inner hole wall of the second concave hole 31 can firmly abut against the stopping soldering tin, the lead and the auxiliary contact are prevented from being separated from each other, and the connection strength between the lead and the auxiliary contact is improved.
Preferably, the first concave hole 29 and the second concave hole 31 are blind holes, i.e. the first concave hole 29 and the second concave hole 31 do not penetrate the main body 21; when the wire is fitted into the first concave hole 29, the wire is prevented from being excessively fitted into the first concave hole 29; when the solder enters the first concave hole 29 through the second concave hole 31, the solder is prevented from flowing out through the second concave hole 31 as compared with the case that the second concave hole 31 penetrates the main body 21.
Referring to fig. 1 to 5, the insulator 17 has a first blind slot 32 and a second blind slot 33 recessed from an inner side wall of the first blind slot 32, the side wall of the conductive sheet 9 is provided with a protruding fin 34, the first blind slot 32 is used for accommodating the conductive sheet 9, and the inner side wall of the first blind slot 32 is used for blocking the conductive sheet 9 to prevent the conductive sheet 9 from moving left and right relative to the insulator 17; the second blind groove 33 is used for accommodating the convex fin 34, and the inner side wall of the second blind groove 33 abuts against the stop convex fin 34 to prevent the conductive sheet 9 from moving back and forth relative to the insulator 17. Preferably, the first blind groove 32 has second blind grooves 33 on both sides and the conductive sheet 9 has a convex fin 34 on both sides.
The elastic clip 11 includes a first clip 41 and a second clip 42 for clipping and conducting the conductive portion 12 of the first sub-contact 8, the first clip 41 has the same structure as the second clip 42, the clips are substantially in a V shape, each clip has a first tab 43, a second tab 44 bent from one end of the first tab 43, and a third tab 45 bent from one end of the second tab 44 away from the first tab 43, the second tab 44 extends from the first tab 43 in a direction away from the first tab 43, the third tab 45 extends from the second tab 44 in a direction away from the second tab 44, the first tab 43 and the third tab 45 are respectively located at two sides of the second tab 44, the first tab 43 of the first clip 41 is connected with the first tab 43 of the second clip 42 in a V shape, the other ends of the first tab 43 of the first clip 41 are connected with the other ends of the first tab 43 of the second clip 42, the second tabs 44 of the two tabs extend from the second tab 43 in a direction toward each other, and the two third tabs 45 extend from the second tab 44 in a direction away from each other.
In actual use, the guide connection portion 12 of the first auxiliary contact 8 is inserted between the first clamping piece 41 and the second clamping piece 42, the first auxiliary contact 8 abuts against the connection portion of the second folding piece 44 and the third folding piece 45, and drives the first clamping piece 41 and the second clamping piece 42 to move away from each other, so that the first clamping piece 41 and the second clamping piece 42 are elastically deformed, after the first auxiliary contact 8 is inserted into the required position in the elastic clamp 11, the first auxiliary contact 8 does not move any more, and the first clamping piece 41 and the second clamping piece 42 move towards each other and abut against the outer surface of the first auxiliary contact 8 under the action of self elastic restoring force, so that stable conduction between the first auxiliary contact 8 and the elastic clamp 11 is realized. By the structural arrangement of the first clamping piece 41 and the second clamping piece 42, the situation that the conducting strip 9 and the first auxiliary contact 8 cannot be normally conducted due to the fact that the clamping pieces cannot contact the first auxiliary contact 8 is avoided, and the conduction yield between the first auxiliary contact 8 and the conducting strip 9 is improved.
The control module 6 comprises an insulating support 35, a control circuit board 36 and a third screw 37, the electromagnet assembly 1 is provided with a positioning hole, the insulating support 35 is provided with a positioning column protruding into the positioning hole, the insulating support 35 and the electromagnet assembly 1 are ensured to be assembled rapidly and accurately by utilizing the cooperation of the positioning hole and the positioning column, and the installation and combination efficiency of the electromagnet assembly 1 and the control module 6 is improved.
The third screw 37 is used for fixing the control circuit board 36 on the insulating support 35, ensuring that the control circuit board 36 is firmly connected with the insulating support 35, the insulating support 35 is provided with a third blind groove 38 for accommodating the control circuit board 36, the control circuit board 36 is prevented from being damaged by clamping the bottom wall of the insulating support 35 and the bottom wall of the second blind hole 26, the control circuit board 36 is protected by the inner side wall of the third blind groove 38, the control circuit board 36 is prevented from being damaged by other accessories of the relay, and the control circuit board 36 is used for regulating and controlling the connection or disconnection of the starting coil 4 and the power supply.
The push rod unit 13 further comprises a push rod piece, an insulating sliding block, a reset spring, an over-travel spring 39 and an armature, wherein the insulating sliding block is arranged at one end of the push rod piece in a sliding manner, the movable point block 14 is arranged on the insulating sliding block, preferably, the movable point block 14 and the insulating sliding block are formed together in an injection mode, the over-travel spring 39 is sleeved on the outer side of the push rod piece, the push plate 15 is arranged on the push rod piece, two ends of the over-travel spring 39 respectively abut against the insulating sliding block and the push plate 15, the push plate 15 and the insulating sliding block are isolated by the over-travel spring 39, interference caused by collision between the push plate 15 and the movable point block 14 is avoided, the reset spring is sleeved on the outer side of the other end of the push rod piece, the armature is arranged on the other end of the push rod piece, and two ends of the reset spring respectively abut against the armature and the electromagnet assembly 1.
Referring to fig. 1 to 6, the control module 6 has a control circuit, a power supply is applied to the start-up coil 4 via the control circuit, the control circuit includes a first resistor R1, a first capacitor C1, a second resistor R2, a first diode D1, a MOS transistor Q1, a second diode D2, a second capacitor C2, and a third resistor R3, the first resistor R1, the first capacitor C1, the second resistor R2, and the MOS transistor Q1 are serially connected to form a main circuit, the power supply is applied to the start-up coil 4 via the main circuit, the positive electrode of the first diode D1 is grounded, the conduction point between the first resistor R1 and the first capacitor C1 is conducted with the negative electrode of the first diode D1, the second diode D2 and the third resistor R3 are serially connected to form a sub-circuit, the second capacitor C2 is parallelly connected to the second diode D2, the second capacitor C2 is parallelly connected to the third resistor R3, the conduction point between the second resistor R2 and the MOS transistor Q1 is conducted with one end of the third resistor R3, and the other end of the third resistor R3 is grounded.
In the use process of the control circuit, when the starting coil 4 is electrified, the first capacitor C1 is in a charging state, the circuit is in a 'path' state, and at the moment, a power supply source supplies power to the starting coil 4 through the MOS tube Q1, so that the starting coil 4 and the holding coil 5 are arranged in parallel. When the first capacitor C1 is charged, the circuit is in an 'open circuit' state, the starting coil 4 is powered off, and the power supply is switched on through the holding coil 5, so that the purpose of saving electric energy is achieved.
Through the arrangement of the first diode D1, the voltage stabilizing treatment of the control circuit is realized, the MOS tube Q1 is prevented from being broken down due to the fact that the voltage of the control circuit is too high, and the service life of the MOS tube Q1 is prolonged. Through the setting of the second resistor R2, the current flowing through the MOS tube Q1 is controlled, the purpose of current limiting is achieved, and the damage to the MOS tube Q1 caused by overlarge current flowing through the MOS tube Q1 is avoided. Through the arrangement of the second capacitor C2, voltage stabilizing processing of the circuit is realized, voltage flowing through the MOS tube Q1 and the starting coil 4 is ensured to be kept at a preset value, and the starting coil 4 is ensured to have enough power to meet the design requirement of large stroke. Through the arrangement of the second diode D2, the discharging treatment of the second capacitor C2 is realized, the reverse voltage during the discharging of the second capacitor C2 is limited, and the damage of the MOS tube Q1 caused by the directional voltage during the discharging of the second capacitor C2 is avoided. The discharge of the second capacitor C2 is provided with a load via the arrangement of the third resistor R3.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.
Claims (9)
1. The double-coil multi-contact electromagnetic relay comprises an electromagnet assembly, a contact assembly and a pushing assembly which is movably arranged, wherein the contact assembly comprises a main contact unit and an auxiliary contact unit, the electromagnet assembly is used for driving the pushing assembly to move, and the moving pushing assembly drives the main contact unit and the auxiliary contact unit to be conducted or disconnected; the method is characterized in that: the electromagnet assembly comprises a starting coil, a holding coil and a control module, wherein the starting coil and the holding coil are arranged in parallel, the resistance value of the starting coil is smaller than that of the holding coil, an external power supply is used for supplying power to the starting coil and the holding coil, and the control module is used for regulating and controlling the connection or disconnection of the starting coil and the power supply; the contact assembly also comprises a fixing frame, and the main contact unit comprises two main contacts arranged on the fixing frame; the auxiliary contact unit comprises at least two first auxiliary contacts and at least two conductive sheets, wherein the first auxiliary contacts are arranged on the fixing frame, the first auxiliary contacts correspond to the conductive sheets one by one, the conductive sheets are provided with elastic clamps, the first auxiliary contacts are provided with conductive parts inserted into the elastic clamps, and the elastic clamps clamp the conductive parts; the pushing assembly is provided with a push rod unit which is movably arranged, the push rod unit is provided with a movable point block and a pushing piece, the movable point block is used for conducting two main contacts, and the pushing piece is used for driving the first conducting piece to conduct or disconnect the second conducting piece; the movable point block is made of conductive metal materials.
2. The dual-coil multi-contact electromagnetic relay of claim 1, wherein: the fixing frame comprises a ceramic shell, an insulator and a first screw, wherein the main contact and the first auxiliary contact are welded on the ceramic shell, the first screw is used for fixing the conducting strip on the insulator, the insulator is provided with a first blind hole for accommodating the elastic clamp and the guide connection part, and the inner hole wall of the first blind hole is used for stopping the limiting elastic clamp.
3. The dual-coil multi-contact electromagnetic relay according to claim 2, wherein: the first auxiliary contact is provided with a main body part connected with the guide connection part, the outer diameter of the main body part is larger than that of the guide connection part, the end face of the main body part, which is close to one end of the guide connection part, is used for abutting against the outer surface of the ceramic shell, the guide connection part penetrates through the ceramic shell and stretches into the elastic clamp, and the free end of the guide connection part is provided with a guide inclined plane which is convenient to stretch into the elastic clamp.
4. The dual-coil multi-contact electromagnetic relay of claim 1, wherein: the electromagnetic relay further comprises an insulating shell, an insulating cover body and a second screw, wherein the insulating shell is provided with a second blind hole for accommodating the electromagnet assembly, the contact assembly and the pushing assembly, the second screw is used for fixing the insulating cover body on the insulating shell, the insulating cover body covers the opening of the second blind hole and is used for packaging the electromagnet assembly, the contact assembly and the pushing assembly in the second blind hole, and the main contact protrudes out of the insulating cover body; the auxiliary contact unit further comprises at least two second auxiliary contacts and at least two wires, the first auxiliary contacts, the conductive plates, the second auxiliary contacts and the wires are in one-to-one correspondence, two ends of each wire are welded to the first auxiliary contacts and the second auxiliary contacts respectively, and the second auxiliary contacts are arranged on the insulating shell or/and the insulating cover body and protrude out of the insulating cover body.
5. The dual-coil multi-contact electromagnetic relay of claim 4 wherein: the first auxiliary contact and the second auxiliary contact comprise a first concave hole and a second concave hole communicated with the first concave hole, the first concave hole is concavely formed from the end face of the auxiliary contact, the second concave hole is concavely formed from the side surface of the auxiliary contact, the lead is accommodated in the first concave hole, and external soldering tin enters the first concave hole through the second concave hole so as to weld the lead on the auxiliary contact.
6. The dual-coil multi-contact electromagnetic relay according to claim 2, wherein: the insulator is provided with a first blind groove and a second blind groove concavely arranged from the inner side wall of the first blind groove, the side wall of the conducting strip is provided with a convex fin in a protruding mode, the first blind groove is used for accommodating the conducting strip, and the second blind groove is used for accommodating the convex fin.
7. The dual-coil multi-contact electromagnetic relay of claim 1, wherein: the control module comprises an insulating support, a control circuit board and a third screw, wherein the electromagnet assembly is provided with a positioning hole, the insulating support is provided with a positioning column protruding into the positioning hole, the third screw is used for fixing the control circuit board on the insulating support, the insulating support is provided with a third blind groove for accommodating the control circuit board, and the control circuit board is used for regulating and controlling the connection or disconnection of the starting coil and the power supply.
8. The dual-coil multi-contact electromagnetic relay of claim 1, wherein: the push rod unit further comprises a push rod piece, an insulating sliding block, a reset spring, an overtravel spring and an armature, wherein the insulating sliding block is arranged at one end of the push rod piece in a sliding mode, the movable point block is arranged at the insulating sliding block, the overtravel spring is sleeved on the outer side of the push rod piece, the push piece is arranged on the push rod piece, two ends of the overtravel spring respectively abut against the insulating sliding block and the push piece, the reset spring is sleeved on the outer side of the push rod piece, the armature is arranged at the other end of the push rod piece, and two ends of the reset spring respectively abut against the armature and the electromagnet assembly.
9. The dual-coil multi-contact electromagnetic relay of claim 1, wherein: the control module is provided with a control circuit, a power supply is applied to the starting coil through the control circuit, the control circuit comprises a first resistor, a first capacitor, a second resistor, a first diode, an MOS tube, a second diode, a second capacitor and a third resistor, the first capacitor, the second resistor and the MOS tube are arranged in series to form a main circuit, the power supply is applied to the starting coil through the main circuit, the positive electrode of the first diode is grounded, the conduction position between the first resistor and the first capacitor is conducted with the negative electrode of the first diode, the second diode and the third resistor are connected in series to form a secondary circuit, the second capacitor is connected with the second diode in parallel, the second capacitor is connected with the third resistor in parallel, the conduction position between the second resistor and the MOS tube is conducted with one end of the third resistor, and the other end of the third resistor is grounded.
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