A magnetic latching contactor with large load and low temperature rise

Abstract

The present invention discloses a magnetic latching contactor with large load and low temperature rise. Its structure includes a base, a yoke iron shell, an electromagnetic component, a yoke iron plate, a push rod frame, a pair of static reed plates and a moving reed plate assembly, etc. The electromagnetic component is provided with upper and lower static iron cores, a moving iron core and magnetic blocks, etc. When the electromagnetic component is connected to a rated excitation pulse voltage not less than a certain value to form an instantaneous electromagnetic suction force, it will adsorb the moving iron core to descend or ascend. After the electromagnetic suction force disappears, the magnetic force of the magnetic block synchronously cooperates to keep the descending moving iron core in contact with the lower static iron core or the ascending moving iron core in contact with the upper static iron core, thereby driving the conduction or disconnection of the conduction between the moving reed plate assembly and a pair of static reed plates. Since an instantaneous electromagnetic suction force is adopted, the long-term energization heating of the coil can be avoided, and the inter-turn short circuit and the burning of the coil can be prevented. At the same time, a pair of static reed plates and a moving reed plate assembly under large load adopt structures such as large and small contact points and sequential conduction, which can better reduce the temperature rise of the contact points and the system temperature rise, and improve the product life.

Description

Technical Field

[0001] The present invention relates to a magnetic latching contactor, specifically a magnetic latching contactor with large load and low temperature rise. Background Art

[0002] The structure of a traditional DC magnetic latching contactor mainly consists of a base, a yoke iron shell, an electromagnetic component, a yoke iron plate, a push rod frame, etc. A pair of static reed plates are provided on the base, and a moving reed plate assembly is provided on the push rod frame. The working process is as follows: When the coil of the electromagnetic component is energized, the magnetic field generated by the coil current will cause the static iron core in the electromagnetic component to generate electromagnetic attraction, attracting the moving iron core to descend or ascend, and driving the push rod frame to descend or ascend synchronously against the elastic force of the return spring, so that the normally closed contacts between a pair of static reed plates and the moving reed plate assembly are disconnected, and the normally open contacts are closed; When the coil of the electromagnetic component is de-energized, the electromagnetic attraction on the static iron core disappears, and the return spring pushes the moving iron core to reset, so that the normally closed contacts between a pair of static reed plates and the moving reed plate assembly are disconnected, and the normally open contacts are closed.

[0003] However, in large-load centralized inverters for photovoltaic power generation, traditional DC relays or DC contactors are used on the AC side to protect the AC output. Due to the large current flowing through the control system and serious heating of components such as IGBTs, the control system generally reduces the temperature rise by increasing measures such as fans and heat dissipation copper bars. When using traditional DC relays or DC contactors for control, the static iron core generates electromagnetic attraction, which requires the coil of the electromagnetic component to be continuously energized. This will cause the enameled wire of the coil to heat up for a long time, easily reducing the insulation performance of the enameled wire film of the coil, and then causing inter-turn short circuit and coil burnout. At the same time, when a pair of static reed plates and the moving reed plate assembly under large load are in contact and conducting electricity, it often causes too high a temperature rise at the contacts. And due to the high temperature rise at the contacts and the long-term driving heat of the coil, it not only increases the temperature rise of the system, but also shortens the service life of the relay or contactor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a magnetic latching contactor with large load and low temperature rise, which can effectively solve the problem of long-term heating of the coil and reduce the temperature rise of the contacts, thereby reducing the temperature rise of the system and improving the product life.

[0005] The technical problem of the present invention is realized through the following technical solutions:

[0006] A magnetic latching contactor with large load and low temperature rise, comprising a base, a yoke iron shell mounted on the base, an electromagnetic assembly mounted in the yoke iron shell, and a push rod frame movably arranged below the electromagnetic assembly. It also includes a yoke iron plate fixedly mounted in the yoke iron shell to separate the electromagnetic assembly from the push rod frame. A pair of static reed plates are provided on the base, and a moving reed plate assembly is provided on the push rod frame. The electromagnetic assembly includes a coil frame, an upper coil and a lower coil sleeved and fixed outside the coil frame, and a magnetic block mounted between the upper and lower coils. An upper static iron core is fixedly mounted in the upper coil, a lower static iron core is fixedly mounted in the lower coil, and a moving iron core is movably mounted between the upper and lower static iron cores. A push rod extending upward and connecting the moving iron core is provided at the top of the push rod frame. When the electromagnetic assembly is energized with a pulse voltage not less than the rated excitation voltage to form an instantaneous electromagnetic suction force, the instantaneous electromagnetic suction force adsorbs the moving iron core to descend and then disappears, and the magnetic force of the magnetic block synchronously cooperates to keep the descending moving iron core in contact with the lower static iron core. The moving iron core drives the push rod frame and the moving reed plate assembly to descend synchronously through the push rod, and the conductive connection between the pair of static reed plates is connected through the moving reed plate assembly; or the instantaneous electromagnetic suction force adsorbs the moving iron core to ascend and then disappears, and the magnetic force of the magnetic block synchronously cooperates to keep the ascending moving iron core in contact with the upper static iron core. The moving iron core drives the push rod frame and the moving reed plate assembly to ascend synchronously through the push rod, and the conductive connection between the pair of static reed plates is disconnected through the moving reed plate assembly.

[0007] The moving reed plate assembly includes a bracket buckled and fixed at the bottom of the push rod frame, and a first moving reed plate and a second moving reed plate movably mounted in the bracket. Compression springs that push against each other are provided between the first moving reed plate and the push rod frame, and between the second moving reed plate and the push rod frame. The moving iron core drives the push rod frame and the moving reed plate assembly to descend synchronously through the push rod. The first moving reed plate first connects the conductive connection between the pair of static reed plates, and then the second moving reed plate connects the conductive connection between the pair of static reed plates. The moving iron core drives the push rod frame and the moving reed plate assembly to ascend synchronously through the push rod. The second moving reed plate first disconnects the conductive connection between the pair of static reed plates, and then the first moving reed plate disconnects the conductive connection between the pair of static reed plates.

[0008] The instantaneous electromagnetic suction force of the electromagnetic assembly is greater than the magnetic force of the magnetic block. When the magnetic force of the magnetic block keeps the moving iron core in contact with the upper static iron core, the instantaneous electromagnetic suction force overcomes the magnetic force of the magnetic block and adsorbs the moving iron core to disengage from the upper static iron core and descend; when the magnetic force of the magnetic block keeps the moving iron core in contact with the lower static iron core, the instantaneous electromagnetic suction force overcomes the magnetic force of the magnetic block and adsorbs the moving iron core to disengage from the lower static iron core and ascend.

[0009] An upper and lower through shaft hole is provided in the coil frame. The upper coil, the magnetic block and the lower coil are all sleeved and fixed outside the shaft hole. The upper static iron core, the moving iron core and the lower static iron core are all mounted in the shaft hole, and the upper static iron core is fixed on the yoke iron shell, and the lower static iron core is fixed on the yoke iron plate.

[0010] The upper end of the push rod sequentially passes through the yoke iron plate, the lower static iron core, the moving iron core, and the upper static iron core. Bushings that are in movable contact with the push rod are provided inside both the lower static iron core and the upper static iron core. The moving iron core is fixed in the middle of the push rod.

[0011] The coil holder is provided with a single-coil terminal or a double-coil terminal for electrically connecting to the electromagnetic assembly.

[0012] Each static reed plate is provided with a large static contact and a small static contact; the first moving reed plate is provided with a pair of large moving contacts, and the pair of large moving contacts form a connection or disconnection with the large static contacts on the pair of static reed plates; the second moving reed plate is provided with a pair of small moving contacts, and the pair of small moving contacts form a connection or disconnection with the small static contacts on the pair of static reed plates.

[0013] The first moving reed plate and the second moving reed plate are horizontally arranged side by side inside the bracket, and a limit rivet fixed to the bracket is provided between the first moving reed plate and the second moving reed plate.

[0014] The base is provided with anti-rotation rods respectively located on both sides of the bracket, and the anti-rotation rods on both sides jointly position the bracket and prevent it from rotating.

[0015] A pair of magnetic blocks are provided and symmetrically installed on the coil holder with the shaft hole as the center; the base is provided with a housing that covers the yoke iron shell.

[0016] Compared with the prior art, the present invention mainly improves the electromagnetic component. The structure of the electromagnetic component mainly consists of a coil bobbin, an upper coil and a lower coil sleeved and fixed outside the coil bobbin, and a magnetic block installed between the upper and lower coils. An upper static iron core is fixedly installed in the upper coil, a lower static iron core is fixedly installed in the lower coil, a moving iron core is movably installed between the upper and lower static iron cores, and a push rod extending upward and connecting the moving iron core is provided at the top of the push rod frame; when in use, when the electromagnetic component is connected to a rated excitation pulse voltage or higher to form an instantaneous electromagnetic suction force, after the instantaneous electromagnetic suction force adsorbs the moving iron core to descend and then disappears, the magnetic force of the magnetic block will synchronously cooperate to keep the descending moving iron core in contact with the lower static iron core. At this time, the descending moving iron core can drive the push rod frame and the moving reed plate assembly to descend synchronously through the push rod, and the conductive connection between a pair of static reed plates is connected through the moving reed plate assembly; when the electromagnetic component is connected to a rated excitation pulse voltage or higher to form an instantaneous electromagnetic suction force, after the instantaneous electromagnetic suction force adsorbs the moving iron core to ascend and then disappears, the magnetic force of the magnetic block will synchronously cooperate to keep the ascending moving iron core in contact with the upper static iron core. At this time, the ascending moving iron core can drive the push rod frame and the moving reed plate assembly to ascend synchronously through the push rod, and the conductive connection between a pair of static reed plates is disconnected through the moving reed plate assembly. Since the electromagnetic suction force of the electromagnetic component is an instantaneous electromagnetic suction force and there is no need for the coil to be continuously energized, and the contact between the moving iron core and the upper and lower static iron cores is still maintained by the synchronous cooperation of the magnetic force of the magnetic block, it can effectively prevent the long-term energization and heating of the coil enameled wire, reduce the influence on the insulation performance of the coil enameled wire film, and avoid inter-turn short circuit and coil burnout. At the same time, a large and small contact and sequential conduction structure are adopted for a pair of static reed plates and a moving reed plate assembly under large load, so as to better reduce the contact temperature rise and system temperature rise and improve the product life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic cross-sectional structure diagram of the present invention.

[0018] Figure 2 is Figure 1 the external structure schematic diagram of.

[0019] Figure 3 is Figure 2 one of the perspective views of.

[0020] Figure 4 is Figure 2 the other perspective view of.

[0021] Figure 5 is Figure 4 the exploded perspective view of.

[0022] Figure 6 is a schematic structural diagram of the moving iron core ascending and contacting the upper static iron core when a single-coil terminal is adopted.

[0023] Figure 7 Schematic structural diagram of the moving iron core descending and fitting with the lower static iron core when using a single-coil terminal.

[0024] Figure 8 Schematic structural diagram of the moving iron core ascending and fitting with the upper static iron core when using a double-coil terminal.

[0025] Figure 9 Schematic structural diagram of the moving iron core descending and fitting with the lower static iron core when using a double-coil terminal.

[0026] Figure 10 Schematic structural diagram of the electromagnetic component.

[0027] Figure 11 Schematic structural diagram of the coil bobbin.

[0028] Figure 12 Schematic structural diagram of the push rod holder, moving reed plate assembly and a pair of static reed plates.

[0029] Figure 13 For Figure 12 three-dimensional view.

[0030] Figure 14 Three-dimensional installation structure diagram of the push rod holder and the moving reed plate assembly.

[0031] Figure 15 Schematic structural diagram of the push rod holder. Detailed implementation mode

[0032] The embodiments of the present invention will be further described in detail below with reference to the above-mentioned drawings.

[0033] As Figures 1 to 15 shown, 1. Base, 11. Anti-rotation rod, 12. Socket, 2. Yoke iron shell, 21. Pin, 22. Top hole, 3. Electromagnetic component, 31. Coil bobbin, 311. Shaft hole, 312. Embedded hole, 32. Upper coil, 33. Lower coil, 34. Magnet block, 35. Upper static iron core, 36. Lower static iron core, 37. Moving iron core, 38. Bush, 4. Push rod holder, 41. Push rod, 5. Yoke iron plate, 51. Bottom hole, 6. Static reed plate, 61. Large static contact, 62. Small static contact, 7. Moving reed plate assembly, 71. Bracket, 72. First moving reed plate, 73. Second moving reed plate, 74. Compression spring, 75. Large moving contact, 76. Small moving contact, 77. Limit rivet, 8. Double-coil terminal, 9. Outer shell, 10. Single-coil terminal.

[0034] A magnetic latching contactor with large load and low temperature rise, as Figures 1 to 5 shown, mainly relates to a magnetic latching contactor suitable for use under large loads. Its structure is composed of a base 1, a yoke iron shell 2, an electromagnetic component 3, a yoke iron plate 5, a push rod holder 4, etc., and an outer shell 9 is also provided on the base to cover the yoke iron shell 2 and its related components to form protection.

[0035] The described yoke iron shell 2 is in an inverted U shape, and it is fixedly formed by being respectively inserted into the sockets 12 on both sides of the base 1 through the pins 21 on both sides; the electromagnetic assembly 3 and the push rod frame 4 are arranged in the yoke iron shell 2 in an up-and-down layout manner, and are separated by a yoke iron plate 5 fixedly installed horizontally in the yoke iron shell 2, so that the push rod frame 4 can be movably arranged below the electromagnetic assembly 3.

[0036] The described electromagnetic assembly 3 is as Figure 10 shown, and includes a coil frame 31, an upper coil 32 and a lower coil 33 fixedly sleeved outside the coil frame, and a magnetic block 34 installed between the upper and lower coils. Specifically: first, an axially through hole 311 is provided in the coil frame 31, and the upper coil 32, the magnetic block 34 and the lower coil 33 are fixedly sleeved outside the axially through hole 311 in sequence from top to bottom; at the same time, the upper static iron core 35, the moving iron core 37 and the lower static iron core 36 are also installed in the axially through hole 311 in sequence from top to bottom, and the upper static iron core 35 is fixed on the top hole 22 of the yoke iron shell 2, that is, exactly fixed inside the upper coil 32, and the lower static iron core 36 is fixed on the bottom hole 51 of the yoke iron plate 5, that is, exactly fixed inside the lower coil 33. Then, once the electromagnetic assembly 3 is energized, electromagnetic suction can be generated through the upper and lower static iron cores to adsorb the moving iron core 37 to form a descent or ascent.

[0037] There are a pair of the described magnetic blocks 34, and usually magnetic steels with relatively strong magnetic force are selected. This pair of magnetic blocks 34 are symmetrically embedded in the embedding holes 312 on the coil frame 31 with the axially through hole 311 as the center and provide fixed magnetic force.

[0038] The top of the described push rod frame 4 is provided with a push rod 41 extending upward and connecting the moving iron core 37. The specific structure is: the upper end of the push rod 41 sequentially passes through the yoke iron plate 5, the lower static iron core 36, the moving iron core 37 and the upper static iron core 35. Bushings 38 in movable contact with the push rod 41 are provided in both the lower static iron core 36 and the upper static iron core 35 to facilitate the relative sliding at the contact. The moving iron core 37 is fixed in the middle of the push rod 41 by means of screw tightening. Therefore, the descent or ascent of the moving iron core 37 will drive the push rod frame 4 to synchronously descend or ascend through the push rod 41.

[0039] Of course, in the actual structure, the bushing 38 can also not be designed. This is mainly applicable to working conditions with not high requirements for the number of times, and the purpose of adding the bushing 38 is to extend the mechanical service life when the number of running times is frequent.

[0040] The described push rod frame 4 is provided with a moving reed plate assembly 7. The moving reed plate assembly 7 includes a U-shaped bracket 71 detachably fastened and fixed to the bottom of the push rod frame 4, and a first moving reed plate 72 and a second moving reed plate 73 movably installed within the bracket 71. Among them, the first moving reed plate 72 and the second moving reed plate 73 are arranged horizontally side by side within the bracket 71, and the axial lines of both are perpendicular to the axial line of the bracket 71. A limit rivet 77 fixed to the bracket 71 is further provided between the first moving reed plate 72 and the second moving reed plate 73. The limit rivet is a copper rivet, mainly used to limit that the first moving reed plate 72 and the second moving reed plate 73 can only move up and down within the bracket 71.

[0041] Moreover, anti-rotation rods 11 are respectively provided on the base 1 on both sides of the bracket 71. The anti-rotation rods on both sides mainly play a role in jointly positioning the bracket 71 and preventing the bracket from rotating. Therefore, the bracket 71 can only move up and down during actual operation.

[0042] Compression springs 74 that push against each other are provided between the first moving reed plate 72 and the push rod frame 4, and between the second moving reed plate 73 and the push rod frame 4. Under the elastic pushing of the compression springs in the normal state, the first moving reed plate 72 and the second moving reed plate 73 both descend and fit against the bottom of the bracket 71.

[0043] The first moving reed plate 72 is provided with a pair of large moving contacts 75, and the second moving reed plate 73 is provided with a pair of small moving contacts 76. Correspondingly, a pair of static reed plates 6 respectively corresponding to the first moving reed plate 72 and the second moving reed plate 73 also need to be provided on the base 1, and each static reed plate 6 is provided with a large static contact 61 and a small static contact 62. Moreover, a pair of large moving contacts 75 just form connection or disconnection with the large static contacts 61 on a pair of static reed plates 6, and a pair of small moving contacts 76 just form connection or disconnection with the small static contacts 62 on a pair of static reed plates 6.

[0044] In this way, when the moving iron core 37 drives the push rod frame 4 and the moving reed plate assembly 7 to descend synchronously through the push rod 41, the first moving reed plate 72 first contacts the large static contacts 61 on a pair of static reed plates 6 through a pair of large moving contacts 75, thereby first connecting the conductive connection between the first moving reed plate 72 and a pair of static reed plates 6. Then, the second moving reed plate 73 contacts the small static contacts 62 on a pair of static reed plates 6 through a pair of small moving contacts 76, thereby secondarily connecting the conductive connection between the second moving reed plate 73 and a pair of static reed plates 6.

[0045] Conversely, if the moving iron core 37 drives the push rod frame 4 and the moving reed plate assembly 7 to rise synchronously through the push rod 41, a pair of small moving contacts 76 on the second moving reed plate 73 will first separate from the small static contacts 62 on the pair of static reed plates 6, that is, the second moving reed plate 73 will first disconnect the conductive connection between the pair of static reed plates 6, and then a pair of large moving contacts 75 on the first moving reed plate 72 will separate from the large static contacts 61 on the pair of static reed plates 6, that is, the first moving reed plate 72 will then disconnect the conductive connection between the pair of static reed plates 6.

[0046] The working process of the present invention is as follows: When the electromagnetic assembly 3 is connected to a rated excitation pulse voltage or higher to form an instantaneous electromagnetic attraction force, after the instantaneous electromagnetic attraction force adsorbs the moving iron core 37 to descend and then disappears, the magnetic force of the magnet 34 will synchronously cooperate to keep the descending moving iron core 37 in contact with the lower static iron core 36. At this time, the descending moving iron core 37 can drive the push rod frame 4 and the moving reed plate assembly 7 to descend synchronously through the push rod 41, and conduct the conductive connection between a pair of static reed plates 6 through the moving reed plate assembly; When the electromagnetic assembly 3 is connected to a rated excitation pulse voltage or higher to form an instantaneous electromagnetic attraction force, after the instantaneous electromagnetic attraction force adsorbs the moving iron core 37 to rise and then disappears, the magnetic force of the magnet 34 will synchronously cooperate to keep the ascending moving iron core 37 in contact with the upper static iron core 35. At this time, the ascending moving iron core 37 can drive the push rod frame 4 and the moving reed plate assembly 7 to rise synchronously through the push rod 41, and disconnect the conductive connection between a pair of static reed plates 6 through the moving reed plate assembly.

[0047] Obviously, in the above working process, the instantaneous electromagnetic attraction force of the electromagnetic assembly 3 needs to be greater than the magnetic force of the magnet 34. When the magnetic force of the magnet keeps the moving iron core 37 in contact with the upper static iron core 35, this instantaneous electromagnetic attraction force will overcome the magnetic force of the magnet 34 and adsorb the moving iron core 37 to separate from the upper static iron core 35 and descend; When the magnetic force of the magnet 34 keeps the moving iron core 37 in contact with the lower static iron core 36, this instantaneous electromagnetic attraction force will overcome the magnetic force of the magnet 34 and adsorb the moving iron core 37 to separate from the lower static iron core 36 and rise.

[0048] Since the electromagnetic attraction force of the electromagnetic assembly 3 is an instantaneous electromagnetic attraction force, there is no need for the coil to be continuously energized. Moreover, the contact between the moving iron core 37 and the upper and lower static iron cores is still maintained by the synchronous cooperation of the magnetic force of the magnet 34. Therefore, it can effectively prevent the long-term energization and heating of the coil enameled wire, reduce the influence on the insulation performance of the coil enameled wire film, and also avoid inter-turn short circuit and coil burnout.

[0049] In addition, the purpose of designing such a contact structure between the moving reed plate assembly 7 and a pair of static reed plates 6 is mainly to reduce the temperature rise of the contacts. By connecting two large contacts in series for current shunting, they are connected first and then disconnected, and the large contacts are made of contact materials with strong arc resistance, which can better ensure the electrical life of the product. The small contacts are also connected in series for current shunting, and the small contacts are lower in height than the large contacts. They are mainly made of materials with high conductivity and low bulk resistance. They are connected after the large contacts are connected first, playing a current-carrying role and better reducing the temperature rise of the contacts, and thus reducing the temperature rise of the load terminals. When disconnecting, the small contacts are disconnected first, and the large contacts are disconnected later, which can ensure the action reliability. Therefore, even under large loads, it can better reduce the temperature rise of the contacts and the system temperature rise, and improve the product life.

[0050] A single-coil terminal 10 or a double-coil terminal 8 for electrically connecting the electromagnetic assembly 3 is provided on the coil bobbin 31 described above.

[0051] Among them, the working process of the single-coil terminal 10 is as follows: In the initial state, as Figure 6 shown, the moving iron core 37 is attached to the upper static iron core 35 under the magnetic force of the magnetic block 34. When a voltage not less than the rated excitation pulse voltage is applied between the two coil legs of the single-coil terminal 10 and then powered off after less than 100 ms, the electromagnetic attraction generated by the electromagnetic assembly 3 will overcome the magnetic force of the magnetic block 34 and cause the moving iron core 37 to descend and attach to the lower static iron core 36. Thereby driving the large and small contacts between the moving reed plate assembly 7 and a pair of static reed plates 6 to contact and conduct electricity successively, and maintaining this state by the magnetic force of the magnetic block 34. At this time, both the first moving reed plate 72 and the second moving reed plate 73 are pushing against the compression spring 74 in a compressed state.

[0052] When a reverse voltage not less than the rated excitation pulse voltage is applied between the two coil legs of the single-coil terminal 10 and then powered off after less than 100 ms, then as Figure 7 shown, the restoring elastic force of the compression spring 74 and the reverse electromagnetic attraction generated by the electromagnetic assembly 3 will be greater than the magnetic force of the magnetic block 34, and cause the moving iron core 37 to rise and attach to the upper static iron core 35 to return to the initial state. Thereby driving the large and small contacts between the moving reed plate assembly 7 and a pair of static reed plates 6 to separate successively, and maintaining this state by the magnetic force of the magnetic block 34.

[0053] The working process of the double-coil terminal 8 is as follows: In the initial state, as Figure 8As shown, the moving iron core 37 fits against the upper static iron core 35 under the magnetic force of the magnetic block 34. When the coil feet on both outer sides of the double-coil terminal 8 are connected with a voltage not less than the rated excitation pulse voltage and then powered off after less than 100 ms, the electromagnetic attraction generated by the electromagnetic assembly 3 will overcome the magnetic force of the magnetic block 34, causing the moving iron core 37 to descend and fit against the lower static iron core 36. Thereby, it drives the large and small contacts between the moving reed plate assembly 7 and a pair of static reed plates 6 to contact and conduct electricity successively, and this state is maintained by the magnetic force of the magnetic block 34 all the time. At this time, both the first moving reed plate 72 and the second moving reed plate 73 are pushing against the compression spring 74 in a compressed state.

[0054] When the coil feet on both inner sides of the double-coil terminal 8 are connected with a reverse voltage not less than the rated excitation pulse voltage and then powered off after less than 100 ms, it will be as Figure 9 shown. The restoring elastic force of the compression spring 74 and the reverse electromagnetic attraction generated by the electromagnetic assembly 3 will be greater than the magnetic force of the magnetic block 34, and will cause the moving iron core 37 to rise and fit against the upper static iron core 35 to return to the initial state. Thereby, it drives the large and small contacts between the moving reed plate assembly 7 and a pair of static reed plates 6 to separate successively, and this state is maintained by the magnetic force of the magnetic block 34 all the time.

[0055] During the above working process, the energizing time of the coil of the electromagnetic assembly 3 is only within 100 ms, with little heat generation and safer use.

[0056] The above are only specific embodiments of the present invention. Those skilled in the art should understand that any structural design similar to this embodiment should be included within the protection scope of the present invention.

Claims

1. A magnetic latching contactor with large load and low temperature rise, comprising a base (1), a yoke iron shell (2) mounted on the base, an electromagnetic assembly (3) mounted inside the yoke iron shell, and a push rod frame (4) movably arranged below the electromagnetic assembly. It further includes a yoke iron plate (5) fixedly mounted inside the yoke iron shell (2) to separate the electromagnetic assembly (3) from the push rod frame (4); a pair of static contact plates (6) are provided on the base (1), and a moving contact plate assembly (7) is provided on the push rod frame (4). Characterized in that The electromagnetic assembly (3) includes a coil frame (31), an upper coil (32) and a lower coil (33) sleeved and fixed outside the coil frame, and a magnetic block (34) mounted between the upper and lower coils; a fixed upper static iron core (35) is provided inside the upper coil (32), a fixed lower static iron core (36) is provided inside the lower coil (33), and a moving iron core (37) is movably arranged between the upper and lower static iron cores; a push rod (41) extending upward and connecting to the moving iron core (37) is provided at the top of the push rod frame (4); when the electromagnetic assembly (3) is connected to a rated excitation pulse voltage or higher to form an instantaneous electromagnetic suction force, the instantaneous electromagnetic suction force adsorbs the moving iron core (37) to descend and then disappears, and the magnetic force of the magnetic block (34) synchronously cooperates to keep the descending moving iron core (37) in contact with the lower static iron core (36). The moving iron core drives the push rod frame (4) and the moving contact plate assembly (7) to descend synchronously through the push rod (41), and the moving contact plate assembly connects the conductive connection between a pair of static contact plates (6); or the instantaneous electromagnetic suction force adsorbs the moving iron core (37) to ascend and then disappears, and the magnetic force of the magnetic block (34) synchronously cooperates to keep the ascending moving iron core (37) in contact with the upper static iron core (35). The moving iron core drives the push rod frame (4) and the moving contact plate assembly (7) to ascend synchronously through the push rod (41), and the moving contact plate assembly disconnects the conductive connection between a pair of static contact plates (6).

2. A magnetic latching contactor with large load and low temperature rise according to claim 1, Characterized in that The moving contact plate assembly (7) includes a bracket (71) buckled and fixed at the bottom of the push rod frame (4), and a first moving contact plate (72) and a second moving contact plate (73) movably mounted inside the bracket (71). Compression springs (74) that push against each other are provided between the first moving contact plate (72) and the push rod frame (4), and between the second moving contact plate (73) and the push rod frame (4); when the moving iron core (37) drives the push rod frame (4) and the moving contact plate assembly (7) to descend synchronously through the push rod (41), the first moving contact plate (72) first connects the conductive connection between a pair of static contact plates (6), and then the second moving contact plate (73) connects the conductive connection between a pair of static contact plates (6); when the moving iron core (37) drives the push rod frame (4) and the moving contact plate assembly (7) to ascend synchronously through the push rod (41), the second moving contact plate (73) first disconnects the conductive connection between a pair of static contact plates (6), and then the first moving contact plate (72) disconnects the conductive connection between a pair of static contact plates (6).

3. A magnetic latching contactor with large load and low temperature rise according to claim 1, Characterized in that The instantaneous electromagnetic suction force of the electromagnetic component (3) is greater than the magnetic force of the magnetic block (34). When the magnetic force of the magnetic block keeps the moving iron core (37) in contact with the static iron core (35), this instantaneous electromagnetic suction force overcomes the magnetic force of the magnetic block (34) and adsorbs the moving iron core (37) to disengage from the static iron core (35) and descend; when the magnetic force of the magnetic block (34) keeps the moving iron core (37) in contact with the lower static iron core (36), this instantaneous electromagnetic suction force overcomes the magnetic force of the magnetic block (34) and adsorbs the moving iron core (37) to disengage from the lower static iron core (36) and ascend.

4. A magnetic latching contactor with large load and low temperature rise according to claim 1, characterized in that a vertically through shaft hole (311) is provided inside the coil bobbin (31); the upper coil (32), the magnetic block (34) and the lower coil (33) are all sleeved and fixed outside the shaft hole (311); the upper static iron core (35), the moving iron core (37) and the lower static iron core (36) are all installed inside the shaft hole (311), and the upper static iron core (35) is fixed on the yoke iron shell (2), and the lower static iron core (36) is fixed on the yoke iron plate (5).

5. A magnetic latching contactor with large load and low temperature rise according to claim 1, characterized in that the upper end of the push rod (41) sequentially passes through the yoke iron plate (5), the lower static iron core (36), the moving iron core (37) and the upper static iron core (35). A shaft sleeve (38) that is in movable contact with the push rod (41) is provided inside both the lower static iron core (36) and the upper static iron core (35), and the moving iron core (37) is fixed in the middle of the push rod (41).

6. A magnetic latching contactor with large load and low temperature rise according to claim 1, characterized in that a single-coil terminal (10) or a double-coil terminal (8) for electrically connecting and turning on the electromagnetic component (3) is provided on the coil bobbin (31).

7. A magnetic latching contactor with large load and low temperature rise according to claim 2, characterized in that a large static contact (61) and a small static contact (62) are provided on each static reed plate (6); a pair of large moving contacts (75) are provided on the first moving reed plate (72), and this pair of large moving contacts are in connection or disconnection with the large static contacts (61) on the pair of static reed plates (6); a pair of small moving contacts (76) are provided on the second moving reed plate (73), and this pair of small moving contacts are in connection or disconnection with the small static contacts (62) on the pair of static reed plates (6).

8. A magnetic latching contactor with large load and low temperature rise according to claim 2, characterized in that the first moving reed plate (72) and the second moving reed plate (73) are horizontally arranged side by side inside the bracket (71), and a limit rivet (77) fixed on the bracket (71) is provided between the first moving reed plate (72) and the second moving reed plate (73).

9. A magnetic latching contactor with large load and low temperature rise according to claim 2, characterized in that anti-rotation rods (11) located on both sides of the bracket (71) are provided on the base (1), and the anti-rotation rods on both sides jointly position the bracket (71) and prevent rotation.

10. A magnetic latching contactor with large load and low temperature rise according to claim 4, characterized in that A pair of the magnetic blocks (34) are provided and symmetrically installed on the bobbin (31) with the shaft hole (311) as the center; an outer shell (9) covering the yoke iron shell (2) is provided on the base (1).

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