Mechanically switched double-coil direct current contactor
By mechanically connecting a microswitch and an insulating bracket in a dual-coil DC contactor, coil switching control is simplified, the problem of PCB board damage is solved, reliability is improved, and costs are reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-03-27
AI Technical Summary
Existing dual-coil DC contactors have complex PCB board structures, are susceptible to environmental interference, and their components are easily damaged, resulting in low reliability and high size and cost.
By using a mechanical method, a microswitch is connected in series in the coil, and the switching of the coil is controlled by an insulating bracket and an insulating actuator, which simplifies the coil switching control and reduces the use of PCB boards.
It improves operational reliability and anti-interference capabilities, reduces weight and production costs, and simplifies the structure and assembly process.
Smart Images
Figure CN224053095U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of circuit protection, in particular to the technical field of direct current in circuit protection, and more particularly to a mechanical switching double-coil direct current contactor. BACKGROUND
[0002] The double-coil direct current contactor provides the force for the contact system to close by the attraction coil alone or the attraction coil and the holding coil together, and provides the holding force for the contact system after closing by the holding coil. That is, the circuit loop in which the attraction coil is located needs to be disconnected after closing, and the circuit loop in which the holding coil is located needs to be kept on after closing. At present, the on and off of the attraction coil and the holding coil of the double-coil direct current contactor is controlled by the PCB to switch between the coils. The PCB structure is complex, and because it has control circuits and components, the PCB generally needs to be separated from the chamber in which the contact system is located. Because the PCB is full of circuits and components, it is easy to be disturbed by the environment or the components to fail during the operation of the direct current contactor, which leads to the failure of coil switching and reduces the working reliability. Moreover, the PCB is large in size and heavy in weight, and high in processing cost, which leads to the relatively large size and weight of the double-coil direct current contactor and high cost. SUMMARY
[0003] The purpose of the present application is to provide a mechanical switching double-coil direct current contactor, which controls the closing and opening of the attraction coil during closing and opening by connecting a mechanical on-off micro switch in series in the attraction coil, so as to provide the holding force for the contact system after closing only by the holding coil. The switching between the coils is realized by mechanical mode, which improves the working reliability and anti-interference ability.
[0004] To solve the above technical problems, the technical solution provided is a mechanical switching double-coil direct current contactor, which comprises a double-coil driving system and a contact system.
[0005] The double-coil driving system comprises an attraction coil and a holding coil arranged in parallel, and the contact system comprises a moving contact bridge assembly and a stationary contact.
[0006] An insulating support is arranged in the chamber in which the contact system is located, and a first metal spring and a first micro switch are arranged on the insulating support in intervals. The first micro switch is connected in series with the first metal spring at both ends, and the first micro switch is connected in series with the attraction coil through the first metal spring. A first insulating actuator is arranged on the moving contact bridge assembly, and the first micro switch is located on the displacement path of the first insulating actuator during closing. The circuit loop in which the attraction coil and the holding coil are located is on during opening.
[0007] When closing, the closing coil and the holding coil are energized at the same time, the moving contact bridge assembly is driven to displace the first insulation executor, and the contact system is closed. At the same time, the first insulation executor mechanically changes the first micro switch from the closed state to the open state, and the circuit loop in which the closing coil is located is disconnected. When opening, the first micro switch is reset to the closed state.
[0008] Preferably, the first metal spring and the insulation support are integrally injection molded.
[0009] Preferably, two first switch contact pins are fixed on one side of the static contact, and the two first switch contact pins are in series in the circuit loop in which the closing coil is located. The first metal spring is in conductive contact with the first switch contact pin.
[0010] Preferably, the insulation support is fixed across the moving contact bridge assembly, and a space for displacement of the moving contact bridge assembly is reserved between the insulation support and the moving contact bridge assembly. The static contact and the two ends of the moving contact bridge of the moving contact bridge assembly in conductive contact with the static contact are respectively located outside the insulation support.
[0011] Preferably, a second metal spring and a second micro switch are further arranged on the insulation support, the two ends of the second micro switch are in series connection with the second metal spring, two auxiliary contact pins are further arranged on one side of the static contact, the two auxiliary contact pins are in series in an auxiliary circuit in an insulating and spaced manner, the second metal spring is in conductive contact with the auxiliary contact pin, a second insulation executor is further arranged on the moving contact bridge assembly, the second micro switch is located on the displacement path of the second insulation executor when closing, and the second micro switch is in a normally open state when opening to disconnect the auxiliary circuit. When closing, the moving contact bridge assembly displaces the first insulation executor and the second insulation executor, the moving contact bridge assembly closes the contact system, the first insulation executor and the second insulation executor respectively act on the first micro switch and the second micro switch to change the switch state, disconnect the circuit loop in which the closing coil is located, and make the auxiliary circuit conductive.
[0012] Preferably, the second metal spring and the insulation support are integrally injection molded.
[0013] Preferably, the first metal spring and the first micro switch, and the second metal spring and the first micro switch are respectively located on opposite sides of the insulation support and outside the static contact.
[0014] Preferably, the first insulation executor and the second insulation executor are respectively arranged on opposite sides of the base of the moving contact bridge assembly.
[0015] Preferably, the first and second insulation execution members are in a rod-like structure, respectively protruding from the base towards one end of the stationary contact.
[0016] Preferably, the first and second insulation execution members are integrally formed with the base.
[0017] The mechanical switching double-coil DC contactor of the present application adopts a first metal spring and a first micro switch connected in series with the attraction coil on the insulation support, a first insulation execution member on the movable contact bridge assembly, and the displacement of the insulation execution member to actuate the micro switch to change the switching state of the micro switch, thereby realizing the switching of the double coil and saving the PCB circuit board for coil switching control. The mechanical switching of the double coil instead of the PCB board improves the switching reliability and anti-interference ability.
[0018] Meanwhile, a second metal spring and a second micro switch connected in series with the auxiliary circuit are arranged on the insulation support, a second insulation execution member is arranged on the movable contact bridge assembly, and the displacement of the second insulation execution member changes the switching state of the second micro switch to realize the conduction of the auxiliary circuit.
[0019] After the insulation support is integrally injection molded with the first and second metal springs and connected with the first and second micro switches, the insulation support with the micro switches is formed, and the insulation support is installed to realize the conductive contact of the metal springs with the first switch contact pin and the auxiliary contact pin, thereby realizing the series connection with the circuit loop and the auxiliary circuit of the attraction coil, and simplifying the structure and assembly process.
[0020] The first and second insulation execution members are arranged on the base of the movable contact bridge assembly, or the base of the movable contact bridge assembly is integrally connected with the first and second insulation execution members through integral injection molding, thereby further simplifying the number of spare parts and the assembly process.
[0021] The use of the insulation support and the insulation execution member saves the PCB circuit board, fully utilizes the space in the existing DC contactor, improves the space utilization, and reduces the weight of the DC contactor compared with the existing DC contactor using the PCB board. The use of the insulation support and the insulation execution member and the injection molding process reduces the production cost. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a circuit schematic diagram.
[0023] Figure 2 is Figure 1 a specific structure diagram.
[0024] Figure 3 is a schematic diagram of an insulating support structure.
[0025] Figure 4 is a schematic diagram of a structure without a protective cover.
[0026] Figure 5 is a schematic diagram of a base of an insulating actuator and a moving contact bridge assembly.
[0027] Reference signs
[0028] Attracting coil 1, holding coil 2, normally closed switch 3, static contact 4, protective cover 5, moving contact bridge assembly 6, double coil 7, moving iron core 8, push rod 9, first switch contact 10, auxiliary contact 11, first insulating actuator 12, second insulating actuator 13, insulating support 14, first metal spring 15, second metal spring 16, first micro switch 17, second micro switch 18, base 601. DETAILED DESCRIPTION
[0029] The mechanical switching double coil DC contactor of the application comprises a double coil driving system and a contact system.
[0030] The double coil driving system comprises an attracting coil and a holding coil arranged in parallel, and the contact system comprises a moving contact bridge assembly and a static contact.
[0031] An insulating support is arranged in a chamber where the contact system is located, first metal springs and first micro switches are arranged on the insulating support at intervals, the first micro switches are connected in series with the first metal springs at both ends, and the first micro switches are connected in series with the attracting coil through the first metal springs; a first insulating actuator is arranged on the moving contact bridge assembly, and the first micro switch is located on the displacement path of the first insulating actuator when the contactor is closed; when the contactor is opened, the circuit loop of the attracting coil and the holding coil is conducted.
[0032] When the contactor is closed, the attracting coil and the holding coil are energized at the same time, the moving contact bridge assembly is driven to displace with the first insulating actuator, so that the contact system is closed, and at the same time, the first insulating actuator mechanically converts the first micro switch from a closed state to an open state, thereby breaking the circuit loop of the attracting coil; when the contactor is opened, the first micro switch is reset to the closed state.
[0033] The preferred embodiments will be described in detail below with reference to the drawings. The orientation words involved are only based on the orientation shown in the drawings, and do not constitute a limitation on the technical solutions of the application.
[0034] The mechanical switching double coil DC contactor of the application, its principle diagram is shown in Figure 1The attracting coil 1 and the holding coil 2 are respectively conductively connected with the power supply, so that the attracting coil 1 and the holding coil 2 form a parallel relationship. The circuit loop in which the holding coil 2 is located is in a conductive state, a normally closed switch 3 is connected in series in the attracting coil 1, the normally closed switch 3 is used to control the conduction or disconnection of the circuit loop in which the attracting coil 1 is located, when the contactor is in the open position, the circuit loops in which the attracting coil 1 and the holding coil 2 are located are both conductive, an insulating actuator is arranged on the movable contact bridge assembly, when the contactor is in the closed position, the movable contact bridge assembly is displaced towards the fixed contact, at the same time, the insulating actuator on the movable contact bridge assembly mechanically opens the normally closed switch 3, disconnects the circuit loop in which the attracting coil 1 is located, and only the holding coil 2 is kept to continue to work, thereby providing a holding force for the contact system after the contactor is closed.
[0035] The specific implementation structure is described below with reference to Figures 2 to 5 The contactor includes a double-coil driving system, a contact system and a protective cover 5, the double-coil driving system and the contact system are respectively located in different cavities, and the protective cover 5 is arranged in the cavity in which the contact system is located. The contact system includes a movable contact bridge assembly 6 and a fixed contact 4, the movable contact bridge assembly 6 is arranged in the protective cover 5, the fixed contact 4 is fixedly arranged on the top of the protective cover 5, one end of the fixed contact 4 is located in the protective cover 5, and the other end of the fixed contact 4 is located outside the protective cover 5 and can be connected with an external circuit of the contactor.
[0036] The double-coil driving system includes a double coil 7, a movable iron core 8 and a push rod 9, the push rod 9 is fixed on the movable iron core 8, and one end of the push rod 9 is located in the cavity in which the contact system is located, i.e. in the protective cover 5. The double coil 7 includes an attracting coil 1 and a holding coil 2. The movable contact bridge assembly 6 is mounted on one end of the push rod 9 located in the cavity in which the contact system is located. Two first switch contact pins 10 and two auxiliary contact pins 11 are respectively fixedly arranged on the top of the protective cover 5 on the opposite sides of the two fixed contacts 4, the two first switch contact pins 10 and the two auxiliary contact pins 11 are respectively and insulatively arranged, one end of each of the first switch contact pin 10 and the auxiliary contact pin 11 is located in the protective cover 5, and the other end of each of the first switch contact pin 10 and the auxiliary contact pin 11 is located outside the top of the protective cover 5. The two first switch contact pins 10 are conductively connected with two ends of the attracting coil 1, so that the two first switch contact pins 10 are connected in series in the circuit loop in which the attracting coil 1 is located in an insulatively spaced manner. The two auxiliary contact pins 11 are connected in series in an auxiliary circuit in an insulatively spaced manner, and the auxiliary circuit is used to provide an indication for the opening and closing of the DC contactor.
[0037] The movable contact bridge assembly 6 comprises a base 601 fixedly arranged at the end of the push rod 9 located in the protective cover 5, a support frame is arranged on the base 601, and a contact spring, a lower magnetic conductor, a movable contact bridge and an upper magnetic conductor are sequentially arranged on the base 601 in the support frame. First and second insulation execution members 12 and 13 are respectively arranged on the opposite two outer sides of the base 601, the first and second insulation execution members 12 and 13 are in a rod-shaped structure, and the end of the first and second insulation execution members 12 and 13 protruding from the base 601 is directed towards the static contact. The first and second insulation execution members 12 and 13 are integrally injection molded with the base 601, so that the base, the first and second insulation execution members 12 and 13 are in an integrated structure, facilitating assembly. Of course, in some embodiments, the first and second insulation execution members 12 and 13 can also be separately manufactured from the base 601.
[0038] The insulating support 14 is arranged above the movable contact bridge assembly 6 in the protective cover 5, and a space for displacement of the movable contact bridge assembly 6 is reserved between the insulating support 14 and the movable contact bridge assembly 14. The two ends of the movable contact bridge of the movable contact bridge assembly 6 and the static contact 4 are respectively located outside the insulating support 14, that is, the arrangement of the insulating support 14 does not hinder the displacement of the movable contact bridge assembly 6 when the movable contact bridge assembly 6 is opened and closed and the conductive contact action with the static contact 4 when the movable contact bridge assembly 6 is closed. A group of first metal springs 15 and a group of second metal springs 16 are respectively arranged on the opposite sides of the insulating support 14. The first metal springs 15 and the second metal springs 16 are integrally formed with the insulating support by a buried mold injection process, and in order to improve the insulation effect, the first metal springs 15 and the second metal springs 16 are located in the insulating support except for the two ends. One end of the first metal spring 15 and the second metal spring 16 extends outside the insulating support 14 as a contact end, the other end of the first metal spring 15 is in conductive connection with the normally closed pin of the first micro switch 17, and the other end of the second metal spring 16 is in conductive connection with the normally open pin of the second micro switch 18, forming a connection mode in which the first micro switch 17 and the first metal spring 15 and the second metal spring 16 and the second micro switch 18 are respectively connected in series. The end of the first metal spring 15 as the contact end is located above the first micro switch 17 and is in conductive contact with the first switch contact pin 10, and the end of the second metal spring 16 as the contact end is located above the second micro switch 18 and is in conductive contact with the auxiliary contact pin 11. When the first metal spring 15 and the second metal spring 16 are respectively in conductive contact with the first switch contact pin and the auxiliary contact pin, the contact ends of the first metal spring 15 and the second metal spring 16 are in a compressed state, so that the contact ends of the first metal spring 15 and the second metal spring 16 are pressed against the end of the first switch contact pin and the auxiliary contact pin under the action of the elastic force, ensuring reliable contact. Through the conductive contact of the first metal spring 15 and the second metal spring 16 with the first switch contact pin and the auxiliary contact pin respectively, the first micro switch 17 is connected in series in the circuit loop in which the attraction coil 1 is located, and the second micro switch 18 is connected in series in the auxiliary circuit. In the open position, the first micro switch 17 is in a normally closed state as a normally closed switch 3 connected in series in the circuit loop in which the attraction coil 1 is located, so that the circuit loop in which the attraction coil 1 is located is conductive, and the second micro switch 18 is in a normally open state, so that the auxiliary circuit loop is disconnected. The first micro switch 17 and the second micro switch 18 are respectively fixedly arranged on the insulating support 14, and the first micro switch 17 and the second micro switch 18 are respectively located on the displacement path of the first insulating actuator 12 and the second insulating actuator 13 when closed, that is, the first insulating actuator 12 is arranged corresponding to the first micro switch 17, and the second insulating actuator 13 is arranged corresponding to the second micro switch 18. The first metal spring 15 and the first micro switch 17, and the second metal spring 16 and the second micro switch 18 are respectively located on the opposite outer sides of the movable contact bridge assembly 6 and on the opposite outer sides of the center lines of the two static contacts.
[0039] The micro switch is directly fixed on the insulating support before assembly, and only the insulating support needs to be fixed during assembly, and the metal spring is in contact with the first switch contact and the auxiliary contact through elastic force to realize conductive connection, thereby simplifying the assembly process and improving the assembly efficiency. The insulating support is arranged on the outer periphery of the movable contact bridge assembly, and the space on the outer periphery of the contact system is fully utilized, thereby improving the space utilization.
[0040] When the contactor is closed, the movable contact bridge is in conductive contact with the static contact, and when the movable contact bridge assembly 6 with the first and second insulating actuators 12 and 13 is displaced towards the static contact, the first insulating actuator 12 touches the first micro switch 17, and the first micro switch 17 is switched from the closed state to the open state, thereby disconnecting the circuit loop in which the attraction coil 1 is located; the second insulating actuator 13 touches the second micro switch 18, and the second micro switch 18 is switched from the open state to the closed state, thereby making the auxiliary circuit loop conductive.
[0041] Workflow:
[0042] When the contactor is closed, the power supply is turned on, the circuit loop in which the attraction coil 1 and the closing coil 2 are located is energized, and the magnetic force generated by the attraction coil 1 and the closing coil 2 acts together to displace the movable iron core 8 with the push rod 9, the movable contact bridge assembly 6, and the first and second insulating actuators 12 and 13 towards the static contact, the movable contact bridge of the movable contact bridge assembly 6 is in contact with the static contact to close, and then the first insulating actuator 12 pushes the first micro switch 17 to act, so that the switch state of the first micro switch 17 is switched from the closed state to the open state, and the circuit loop in which the attraction coil 1 is located is disconnected, and only the holding coil 2 provides holding force for the contact system after closing; at the same time, the second insulating actuator 13 pushes the second micro switch 18 to act, so that the switch state of the second micro switch 18 is switched from the open state to the closed state, and the auxiliary circuit is conductive. When the contactor is opened, the movable contact bridge assembly 6 with the first and second insulating actuators 12 and 13 is displaced away from the static contact, the first and second micro switches 17 and 18 are separated from the abutment with the first and second insulating actuators 12 and 13, and the first and second micro switches 17 and 18 are reset under the action of their own elastic force.
Claims
1. A mechanically switched dual-coil DC contactor, characterized by, The double-coil drive system comprises a closing coil and a holding coil arranged in parallel, and the contact system comprises a movable contact bridge assembly and a stationary contact; An insulating support is arranged in a chamber where the contact system is located, and a first metal spring and a first micro switch are arranged on the insulating support in a spaced manner, the two ends of the first micro switch are connected in series with the first metal spring, and the first micro switch is connected in series with the closing coil through the first metal spring; a first insulating executive member is arranged on the movable contact bridge assembly, and the first micro switch is located on the displacement path of the first insulating executive member when the contactor is closed; when the contactor is in an open position, the circuit loop in which the closing coil and the holding coil are located is conducted; When the contactor is closed, the closing coil and the holding coil are energized at the same time, the movable contact bridge assembly is driven to displace with the first insulating executive member, the contact system is closed, and at the same time, the first insulating executive member mechanically changes the first micro switch from a closed state to an open state, and the circuit loop in which the closing coil is located is disconnected; when the contactor is opened, the first micro switch is reset to the closed state. The first metal spring and the insulating support are integrally injection molded.
2. The dual-coil DC contactor of claim 1, wherein, Two first switch contact pins are fixedly arranged on one side of the stationary contact, and the two first switch contact pins arranged in a spaced manner are connected in series in the circuit loop in which the closing coil is located, and the first metal spring is in conductive contact with the first switch contact pin.
3. The dual-coil DC contactor of claim 2, wherein, The insulating support is fixedly arranged above the movable contact bridge assembly, a space for displacement of the movable contact bridge assembly is reserved between the insulating support and the movable contact bridge assembly, and the two ends of the movable contact bridge of the movable contact bridge assembly and the stationary contact in conductive contact with each other are located outside the insulating support.
4. The dual-coil DC contactor of claim 3, wherein, A second metal spring and a second micro switch are further arranged on the insulating support, the two ends of the second micro switch are connected in series with the second metal spring, two auxiliary contact pins are further arranged on one side of the stationary contact, the two auxiliary contact pins are connected in series in an auxiliary circuit in an insulating and spaced manner, the second metal spring is in conductive contact with the auxiliary contact pin, a second insulating executive member is further arranged on the movable contact bridge assembly, the second micro switch is located on the displacement path of the second insulating executive member when the contactor is closed, and when the contactor is in an open position, the second micro switch is in a normally open state, the auxiliary circuit is disconnected, when the contactor is closed, the movable contact bridge assembly displaces with the first insulating executive member and the second insulating executive member, the movable contact bridge assembly closes the contact system, at the same time, the first insulating executive member and the second insulating executive member respectively act on the first micro switch and the second micro switch to change the switch state, disconnect the circuit loop in which the closing coil is located, and conduct the auxiliary circuit.
5. The dual-coil DC contactor according to any one of claims 1 to 4, characterized in that, The second metal spring and the insulating support are integrally injection molded.
6. The dual-coil DC contactor of claim 5, wherein, The first metal spring, the first micro switch, the second metal spring, and the first micro switch are respectively located on opposite sides of the insulating support and outside the stationary contact.
7. The dual-coil DC contactor of claim 6, wherein, 8. The dual-coil DC contactor of claim 5, wherein, The first and second insulation execution members are arranged on opposite sides of a base of the movable contact bridge assembly.
9. The dual-coil DC contactor of claim 8, wherein, The first and second insulation execution members are in the form of rods and protrude from the base towards one end of the stationary contact.
10. The dual-coil DC contactor of claim 8, wherein, The first and second insulation execution members are integrally formed with the base.