High-current reed switch contact structure and high-current reed switch application structure
The high-current reed switch contact structure addresses the issue of arc erosion and sticking contacts by transferring arcs to a separate discharge device, improving current carrying and switching performance.
Patent Information
- Application Number
- CN202111526636.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2015-03-25
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2035-03-25
AI Technical Summary
Small reed switches face challenges in carrying large current loads due to arc erosion and sticking contacts, which are exacerbated by the limitations of traditional arc extinguishing devices in small reed switches with limited volume.
A high-current reed switch contact structure with a specially designed arc discharge structure that transfers arcs generated during switching to a separate arc discharge device, reducing surface damage and improving current carrying capacity.
The solution effectively reduces arc-induced damage to contacts, enhancing the switch's current carrying and switching capabilities by quickly extinguishing arcs at the arc discharge device.
Smart Images
Figure CN114360945B_ABST
Abstract
Description
[0001] This application is a divisional application of application number 201510132609.9, application date March 25, 2015, and invention name “High current reed switch contact structure”. Technical Field
[0002] The present invention relates to the technical field of electric contact structure in an electric power or electronic switch used in various switches, in particular to a high-current reed switch contact structure and a high-current magnetic reed switch application structure. Background Art
[0003] The contact structure of the reed switch in the prior art is designed and produced with a simple planar structure. When applied to a relatively large load, when the on-off voltage exceeds 10V and the current exceeds 0.1A, a gas with extremely high temperature, strong brightness and conductivity will be generated in the contact gap, which is called an arc. The arc will seriously burn the contact surface of the electric contact, causing the contact to stick and be unable to disconnect, or even completely burn the switch contact. In order to improve the on-off ability of the switch, various chemical structures of different electric contacts are used to improve the arc erosion resistance of the electric contact, thereby improving the on-off ability and service life of the switch. In medium and large switches, in order to reduce the arc erosion of the electric contact, a dedicated arc extinguishing device is specially designed. Commonly used arc extinguishing methods include metal grid arc extinguishing, magnetic blowing arc extinguishing, inert protective gas arc extinguishing, vacuum arc extinguishing and the like. Although these arc extinguishing methods have good arc extinguishing effects, in some small reed switches, especially some small reed switches with limited volume, due to the limitations of the switch structure and volume, it is impossible to add traditional arc extinguishing devices.
[0004] At present, reed switches are mainly used in small relays, reed switches, micro switches, travel switches and other series of products. Since the switch contacts of these switches adopt the traditional switch electrical contact design structure, they cannot carry a large charge load. In actual applications, most of the damage is caused by the electrical contacts being adhered or burned due to arc erosion and unable to conduct. In particular, the arc erosion and adhesion of electrical contacts in reed switches and small relay products and travel switches, which have a huge market application volume, are particularly prominent. Summary of the invention
[0005] One of the tasks of the present invention is to provide a new type of high-current reed switch contact structure with a simple structure and the ability to provide a larger carrying current. The reed switch of this structure adopts a specially designed contact structure. On the basis of the traditional switch contact structure, an arc discharge structure device is added to quickly transfer the arc generated by the switch contact at the moment of on and off to the contact arc discharge structure device, thereby reducing the arc ablation of the contact surface of the electric contact, making it difficult for the contact to stick, and greatly improving the current carrying and on-off capacity of the switch. To achieve the above purpose, the technical solution of the present invention is:
[0006] The present invention provides a high-current reed switch contact structure, comprising at least one group of reed electrodes with elasticity or at least one fixed electrode and one reed electrode with elasticity; the reed electrodes are made of conductive material, the overlapping ends have contacts on the opposite sides, and the sides of the ends with contacts have protruding arc discharge devices; the end faces of the reed ends overlap, if the reed switch is a normally open type, there is a certain gap between the two electrode contacts; if the reed switch is a normally closed type, the two electrode contacts are in a tightly closed state; if the reed switch is a conversion type, the midpoint electrode and The normally closed electrode is in a tightly closed state, with a certain gap from the normally open electrode; the front spacing between the contacts and the spacing between the side shoulder of the contact and the shoulder of the arc discharge device are determined according to the specific breaking current voltage and breakdown voltage and other related working parameters of the switch. In the disconnected static state, the front spacing between the contacts should be greater than the spacing between the side shoulder of the contact and the shoulder of the arc discharge device. The spacing between the side shoulder of the contact and the shoulder of the arc discharge device is the maximum breakdown voltage distance of the switch; the opposing surfaces of the side shoulder of the electrode and the shoulder of the arc discharge device are electroplated with an arc erosion-resistant plating layer.
[0007] At the moment when the two electrodes change from a closed state to an open state, an arc will be generated between the two contacts. As the distance between the two contacts gradually increases, when the front distance between the electrical contacts increases to a value greater than the distance between the side shoulder of the contact and the shoulder of the arc discharge device, the arc will transfer to between the side shoulder of the contact and the shoulder of the arc discharge device; as the distance between the two electrodes further increases, the front distance between the contacts and the distance between the side of the contact and the arc discharge device increase at the same time until the arc is extinguished; finally, when the front distance between the contacts and the distance between the side of the contact and the arc discharge device reach the maximum, the two electrodes maintain the final stable state.
[0008] During the conversion process between electrodes, the time for the arc to travel between the two electrical contact surfaces to the arc discharge ends at the two electrode ends is extremely short, and most of the arc burning continues mainly between the arc discharge ends at the two electrode ends, thereby reducing the damage of the arc to the electrical contact surface with a large arc and increasing the charge carrying capacity of the reed switch.
[0009] The technical solution of the present invention is combined with the technical solution of the patent application (patent application number 201410501337.0 for a high current reed switch), which can greatly increase the charge carrying capacity of the reed switch.
[0010] The second task of the present invention is to provide a high-current reed switch application structure, which includes a high-current reed switch contact structure to reduce the arc erosion of the contact surface of the electrical contact of the reed switch, making the contacts less likely to stick together, and greatly improving the current carrying and switching capabilities of the switch. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the basic principle structure of the present invention and a schematic diagram of the structure of the first embodiment;
[0012] Figure 2 It is a schematic diagram of the basic principle structure of the present invention and a schematic diagram of the structure of the second embodiment;
[0013] Figure 3 It is a schematic diagram of the basic principle structure of the present invention and a schematic diagram of the structure of the third embodiment;
[0014] Figure 4 It is a schematic diagram of the basic principle structure of the present invention and a schematic diagram of the structure of the fourth embodiment;
[0015] Figure 5 It is a schematic diagram of the basic principle structure of the present invention and a schematic diagram of the structure of the fifth embodiment;
[0016] Figure 6 It is a schematic diagram of the basic principle structure of the present invention and a schematic diagram of the structure of the sixth embodiment. DETAILED DESCRIPTION
[0017] Reed switches are generally divided into three types: A normally open type; B normally closed type; C changeover switch type.
[0018] Embodiment 1: Figure 1 The present invention shows a high current reed switch contact structure, which is a schematic diagram of the reed switch normally open state structure. It is composed of at least one group of reed electrodes (11, 12) with elasticity or at least one fixed electrode (12) and an reed electrode (11) with elasticity; the electrodes (11, 12) are made of conductive material, one end of which is overlapped with the other, and the opposite surfaces of the overlapped ends are provided with contacts (13, 14); the reed electrodes (11, 12) have arc discharge devices (16) protruding from the side of the contact end, and the reed electrode (12) has arc discharge devices (162) protruding from the side of the contact end; there is a certain gap between the reed electrode contacts (13, 14); the front distance (L1) between the electrode contacts (13, 14) and the contact distance (L2) between the electrode contacts (13, 14) are equal to the distance between the electrodes (13, 14) and ... The distance (L2) between the side shoulder (15, 152) of the point and the shoulder (17, 172) of the arc discharge device is determined according to the specific breaking current voltage and breakdown voltage and other related working parameters of the switch. In the disconnected static state, the front distance (L1) between the contacts should be greater than the distance (L2) between the side shoulder (15, 152) of the contact and the shoulder (17, 172) of the arc discharge device. The distance (L2) between the side of the contact and the arc discharge device is the maximum breakdown voltage distance of the switch. The opposite surfaces of the side shoulder (15, 152) of the electrode and the shoulder (17, 172) of the arc discharge device are electroplated with an arc erosion-resistant electroplating layer.
[0019] When the two electrodes (11, 12) are turned from a closed state to an open state, an arc is generated between the two contacts (13, 14). As the distance (L1) between the two contacts gradually increases, when the front distance (L1) between the electrical contacts (13, 14) increases to be greater than the distance (L2) between the side shoulders (15, 152) of the contacts and the shoulders (17, 172) of the arc discharge device, the arc is transferred to between the side shoulders (15, 152) of the contacts and the shoulders (17, 172) of the arc discharge device (16, 162); as the distance (L1) between the two electrodes further increases, the front distance (L1) between the contacts and the distance (L2) between the side faces of the contacts and the arc discharge device increase simultaneously until the arc is extinguished; finally, when the front distance (L1) between the contacts and the distance (L2) between the side faces of the contacts and the arc discharge device reach a maximum, the two electrodes (11, 12) maintain a final stable state.
[0020] The process of the two electrodes (11, 12) changing from the disconnected state to the closed state is opposite to the disconnection process.
[0021] Embodiment 2: Figure 2 The present invention shows a high current reed switch contact structure, which is a schematic diagram of the reed switch normally open state structure. It is composed of at least one group of reed electrodes (21, 22) with elasticity or at least one fixed electrode (22) and an reed electrode (21) with elasticity; the electrodes (21, 22) are made of conductive material, the end faces of one end of which overlap, and the opposite faces of the overlapped ends have contacts (23, 24), wherein the reed electrode (22) has a protruding arc discharge device (26) on the side of the contact end; there is a certain gap between the reed electrode contacts (23, 24); the front distance (L1) between the electrode contacts (23, 24) and the contact side distance (L2) between the electrode contacts (23, 24) are The distance (L2) between the shoulder (25) and the shoulder (27) of the arc discharge device is determined according to the specific breaking current voltage and breakdown voltage of the switch. In the disconnected static state, the front distance (L1) between the contacts should be greater than the distance (L2) between the side shoulder (25) of the contact and the shoulder (27) of the arc discharge device. The distance (L2) between the side of the contact and the arc discharge device is the maximum breakdown voltage distance of the switch. The opposite surfaces of the electrode side shoulder (25) and the arc discharge device shoulder (27) are electroplated with an arc erosion-resistant electroplating layer.
[0022] The description of the conversion process between the closed state and the open state of the two electrodes (21, 22) and the movement process of the arc between the contacts is similar to the opening and closing process of the first embodiment.
[0023] Embodiment 3: Figure 3The invention shows a high current reed switch contact structure, which is a schematic diagram of the normally closed state structure of the reed switch. The structure is composed of at least one group of elastic reed electrodes (31, 32) or at least one fixed electrode (32 or 31) and an elastic reed electrode (31 or 32); the reed electrodes (31, 32) are made of conductive material, the end faces of one end of which overlap, and the opposite faces of the overlapped ends have contacts (33, 34), wherein the reed electrode (31 or 32) has a protruding arc discharge device (36) on the side of the contact end; the end faces of the reed electrodes (31, 32) overlap, and the two electrode contacts (33, 34) are in a tightly closed state.
[0024] The description of the conversion process between the closed state and the open state of the two electrodes (31, 32) and the movement process of the arc between the contacts is similar to the opening and closing process of the first embodiment.
[0025] Embodiment 4: Figure 4 The invention shows a high current reed switch contact structure, which is a schematic diagram of the reed switch conversion state structure. The structure is composed of at least one group of elastic reed electrodes (41, 42, 49) or at least one fixed electrode (42, 49) and an elastic reed electrode (41); the fixed electrode or the reed electrode is made of conductive material, one end face of which overlaps with each other, and the opposite face of the overlapped end has a contact (43, 44, 431, 491), wherein the reed electrode or the fixed electrode (42, 49) has a protruding arc discharge device (46, 48) on the side of the contact end; the end faces of the reed electrodes (41, 42, 49) overlap with each other, the contacts (431, 491) of the two electrodes (41, 49) are in a tightly closed state, and the contacts (43, 44) of the two electrodes (41, 42) are in a normally open state.
[0026] The conversion process of the electrode groups (41, 42, 49) between the closed state and the open state and the movement process of the arc between the contacts are similar to the description of the opening and closing process of Example 1.
[0027] Embodiment 5: Figure 5The present invention shows a high-current reed switch contact structure, which is a high-current reed switch application structure, and is composed of a high-strength insulating tube (58) and a group of elastic reed electrodes (51, 52), or a fixed electrode (52) and an elastic reed electrode (51). The insulating tube (58) is filled with an inert protective gas. The reed electrodes (51, 52) are made of a conductive material with excellent magnetic conductivity, and the end faces of one end overlap each other, and the opposite faces of the overlapping ends have contacts (53, 54), wherein the reed electrode (52) has a protruding arc discharge device (56) at the contact end. If the reed switch is a normally open type, there is a certain gap between the two electrode contacts (53, 54); if the reed switch is a conversion type, then the midpoint electrode is in a tightly closed state with the normally closed electrode, and has a certain gap with the normally open electrode. The reed structure is similar to that of Example 4.
[0028] Under the action of magnetic field polarization and when the magnetic field is removed, the closing and opening process between the electrodes of the reed switch and the movement process of the arc between the contacts are similar to those described in Example 1.
[0029] Embodiment 6: Figure 6 The present invention shows a high-current reed switch contact structure, which is a high-current reed switch application structure, and is composed of a high-strength insulating tube (68) and a group of elastic reed electrodes (61, 62), or a fixed electrode (62) and an elastic reed electrode (61). The insulating tube is filled with an inert protective gas. The reed electrodes (61, 62) are made of a conductive material with excellent magnetic conductivity, and the end faces of one end overlap each other. The opposite faces of the overlapping ends have contacts (63, 64), wherein the reed electrode (62) has a protruding arc discharge device (662) at the end of the contact, and the reed electrode (61) has a protruding arc discharge device (66) at the end of the contact. If the reed switch is a normally open type, there is a certain gap between the two electrode contacts (63, 64); if the reed switch is a conversion type, then the midpoint electrode is in a tightly closed state with the normally closed electrode, and has a certain gap with the normally open electrode. The reed structure is similar to that of Example 4.
[0030] Under the action of magnetic field polarization and when the magnetic field is removed, the closing and opening process between the electrodes of the reed switch and the movement process of the arc between the contacts are similar to those described in Example 1.
[0031] The above is only a preferred embodiment of the principle structure of the present invention, and does not set any scope and limitation to the technology of the present invention. Therefore, any slight modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.
Claims
1. High current reed switch contact structure, characterized by It includes at least one set of reed-type electrodes with elasticity, or a fixed electrode and a reed-type electrode with elasticity; The end faces of one end of the electrodes overlap, and contacts are provided on the opposite faces of the overlapping ends. The opposite faces of the overlapping ends of the contacts are parallel to each other, and the front distance between the contacts is (L1). A protruding arc discharge device is provided on the side of the contact portion of the overlapping end of the opposite faces of the electrodes of the reed switch. The arc discharge device is provided on the side of the contact end in the electrode width direction, perpendicular to the parallel faces between the two contacts, and the arc discharge device extends longitudinally in the direction of the two contacts along the perpendicular plane direction of the parallel faces between the two contacts. The distance (L2) between the side faces of the electrodes and the arc discharge device is determined according to the specific operating parameters of the breaking current voltage and the breakdown voltage of the switch, and the front distance (L1) between the contacts is greater than the distance (L2) between the side faces of the electrodes and the arc discharge device.
2. The high current reed switch contact structure according to claim 1, characterized in that The shoulder of the electrode side and the opposite surface of the shoulder of the arc discharge device are plated with an arc erosion resistant plating layer.
3. The high current reed switch contact structure according to claim 1, characterized in that The distance (L2) between the electrode side and the arc discharge device is the maximum breakdown voltage distance of the switch.
4. The application structure of a high-current reed switch includes a high-strength insulating tube and a group of elastic reed electrodes, or a fixed electrode and an elastic reed electrode; the insulating tube is filled with an inert protective gas; the reed electrode is made of a conductive material with excellent magnetic conductivity, the end faces of one end of the electrode overlap, the opposite faces of the overlapping ends are parallel to each other, and the opposite faces of the overlapping ends have contacts, characterized in that: A protruding arc discharge device is provided on the side of the contact end in the electrode width direction, and the arc discharge device extends longitudinally in the direction of the two contacts along the perpendicular plane direction of the parallel planes between the two contacts, and the distance (L2) between the electrode side and the arc discharge device; the front distance (L1) between the contacts and the distance (L2) between the electrode side and the arc discharge device are determined according to the specific operating parameters of the switch breaking current voltage and breakdown voltage, and the front distance (L1) between the contacts is greater than the distance (L2) between the electrode side and the arc discharge device.