Magnetic latching high-voltage direct current contactor

Abstract

A magnetic latching high-voltage direct-current contactor comprises a ceramic shell, a mounting bottom plate is mounted in the middle of an inner cavity of the ceramic shell, and the ceramic shell is divided into a lower accommodating cavity and an upper accommodating cavity by the mounting bottom plate; a coil shell is installed in the lower containing cavity, a coil winding is installed in the coil shell, an iron core shaft hole is formed in the middle of the coil shell, a movable iron core is installed in the iron core shaft hole in a sliding mode, a movable shaft is installed in the middle of the movable iron core, and the upper end of the movable shaft penetrates through the installation bottom plate and is fixedly provided with a movable contact. A static contact is fixedly arranged above the ceramic shell, and the lower surface of the static contact is movably contacted with the upper surface of the moving contact; an annular containing groove is formed in the middle of the upper surface of the coil shell, an annular permanent magnet is installed in the annular containing groove, and the outer surface of the movable iron core makes movable contact with the inner annular face of the annular permanent magnet. According to the utility model, the defects in the prior art are overcome, and after the contactor is connected, the movable and static contacts can be kept in a closed state without continuously supplying power to the coil, so that the energy consumption is effectively reduced, and the purpose of saving energy is achieved.

Description

Technical Field

[0001] This utility model relates to the field of contactor technology, specifically to a magnetic latching high-voltage DC contactor. Background Technology

[0002] A DC contactor consists of an electromagnetic system (moving iron core, stationary iron core, and coil winding), a contact system (moving and stationary contacts), and an arc-extinguishing device. When the contactor's coil winding is energized, a strong magnetic field is generated, causing the stationary iron core to generate an electromagnetic attraction that draws the moving iron core, which in turn drives the contacts to close. When the coil winding is de-energized, the electromagnetic attraction disappears, the moving iron core is released under the action of a spring, the contacts return to their original position, and the moving and stationary contacts open.

[0003] Currently, when a contactor is in the closed state, the coil needs to be continuously energized to keep the contactor in the closed state. This means that the coil is constantly consuming power, which can lead to excessive energy consumption, especially in applications that require the contactor to remain in the closed state for extended periods. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a magnetic latching high-voltage DC contactor that overcomes the deficiencies of existing technologies. Its reasonable design allows the contactor to maintain the moving and stationary contacts in a closed state without continuously supplying power to the coil after being switched on, effectively reducing energy consumption and thus achieving energy saving.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A magnetically latched high-voltage DC contactor includes a ceramic housing. A mounting base plate is fixedly installed in the middle of the inner cavity of the ceramic housing, dividing the ceramic housing into a lower accommodating cavity and an upper accommodating cavity. A coil housing is fixedly installed in the lower accommodating cavity, and a coil winding is installed in the coil housing. An iron core shaft hole is provided in the middle of the coil housing, and a moving iron core is slidably installed in the iron core shaft hole. A movable shaft is fixedly installed in the middle of the movable iron core, and the upper end of the movable shaft passes through the mounting base plate and is fixedly installed with a moving contact. The moving contact is located in the upper accommodating cavity, and a stationary contact is fixedly installed above the ceramic housing, with the lower surface of the stationary contact in movable contact with the upper surface of the moving contact.

[0007] An annular groove is provided in the middle of the upper surface of the coil housing, and an annular permanent magnet is installed in the annular groove. The outer surface of the moving iron core is in contact with the inner ring surface of the annular permanent magnet.

[0008] Preferably, a spring is sleeved on the outer surface of the movable shaft, and the spring is located between the lower surface of the movable contact and the upper surface of the mounting base plate.

[0009] Preferably, the moving contact is configured as a disc-shaped structure.

[0010] Preferably, the coil winding comprises a first coil and a second coil, the first coil and the second coil have the same winding direction, the beginning end of the first coil is provided with a first connecting terminal, the tail end of the second coil is provided with a second connecting terminal, the tail end of the first coil and the beginning end of the second coil are connected to form a common end, and a common connecting terminal is arranged on the common end.

[0011] The utility model provides a kind of magnetic latching high-voltage direct current contactor. With the following beneficial effects: when contactor circuit is conducted, by the voltage pulse signal of on coil winding, it makes that coil winding is electrified to produce the magnetic field same with annular permanent magnet magnetic field direction, to make that dynamic iron core is moved upwards under the magnetic field of coil winding and the magnetic field of magnetic latching magnetic steel and make dynamic contact and static contact, contactor circuit is conducted.And at this time, the magnetic adsorption of annular permanent magnet can be used to make that dynamic iron core is always adsorbed in the position in annular permanent magnet inner ring surface, so that coil winding does not need to continue to be electrified, can directly pass through the magnetic adsorption of annular permanent magnet, to limit and fix dynamic iron core, so that contactor circuit can be in the state of conduction, to effectively reduce energy consumption, reach the purpose of energy saving. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the description of prior art.

[0013] Fig. 1 The structural schematic diagram of the utility model;

[0014] Fig. 2 The structural schematic diagram of the utility model;

[0015] Fig. 3 The structural schematic diagram of the utility model;

[0016] Explanation of reference numerals in the drawing:

[0017] 1, ceramic shell;2, mounting bottom plate;3, coil shell;4, iron core shaft hole;5, dynamic iron core;6, moving shaft;7, dynamic contact;8, static contact;9, annular placement groove;10, annular permanent magnet;11, spring. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following will combine the drawing in the utility model, to the technical scheme in the utility model, clear, complete description.

[0019] Example one, such as Figs. 1-3As shown, a magnetic latching high-voltage DC contactor includes a ceramic housing 1, a mounting base plate 2 is fixedly installed in the inner cavity of the ceramic housing 1, the mounting base plate 2 separates the ceramic housing 1 into a lower accommodating cavity and an upper accommodating cavity; a coil housing 3 is fixedly installed in the lower accommodating cavity, a coil winding is installed in the coil housing 3, an iron core shaft hole 4 is arranged in the middle of the coil housing 3, a moving iron core 5 is slidably installed in the iron core shaft hole 4, a moving shaft 6 is fixedly installed in the middle of the moving iron core 5, and a movable contact 7 is fixedly installed on the upper end of the moving shaft 6 and penetrates through the mounting base plate 2; the movable contact 7 is located in the upper accommodating cavity, a stationary contact 8 is fixedly installed above the ceramic housing 1, and the lower surface of the stationary contact 8 is in movable contact with the upper surface of the movable contact 7.

[0020] An annular placement groove 9 is formed in the middle of the upper surface of the coil housing 3, and an annular permanent magnet 10 is installed in the annular placement groove 9; the outer surface of the moving iron core 5 is in movable contact with the inner annular surface of the annular permanent magnet 10.

[0021] Working principle:

[0022] In use, when the contactor circuit is turned on, an electric voltage pulse signal is applied to the coil winding to make the coil winding generate a magnetic field in the same direction as the magnetic field of the annular permanent magnet 10, so that the moving iron core 5 moves upward under the combined action of the magnetic field generated by the coil winding and the magnetic field of the magnetic latching magnet, and the movable contact 7 is in contact with the stationary contact 8, and the contactor circuit is turned on. At this time, the moving iron core 5 also moves upward to a position between the inner annular surfaces of the annular permanent magnet 10, so that the moving iron core 5 is always attracted to the position between the inner annular surfaces of the annular permanent magnet 10 by the magnetic attraction of the annular permanent magnet 10, so that the coil winding does not need to be continuously energized, and the moving iron core 5 can be directly positioned and fixed by the magnetic attraction of the annular permanent magnet 10, so that the contactor circuit can always be in a turned-on state, thereby effectively reducing energy consumption and achieving the purpose of energy saving.

[0023] When the contactor needs to be turned off, a reverse electric voltage pulse signal can be applied to the coil winding to make the coil winding generate a magnetic field in the opposite direction of the magnetic field of the annular permanent magnet 10, and in this embodiment, the magnetic field generated by the coil winding has a greater force on the moving iron core 5 than the magnetic field of the annular permanent magnet 10; therefore, the moving iron core 5 can be driven to move downward under the action of the magnetic field generated by the coil winding, and then the moving iron core 5 moves away from the annular permanent magnet 10 and falls back to the initial position in the iron core shaft hole 4. so that the contactor circuit is turned off.

[0024] In the second embodiment, as a further preferred solution of the first embodiment, a spring 11 is arranged on the outer surface of the moving shaft 6 between the lower surface of the moving contact 7 and the upper surface of the mounting base 2. The spring 11 can provide a buffering effect for the moving contact 7 when it is falling down, so that the moving core 5 has a certain buffering effect when it falls back to the initial position in the core shaft hole 4, avoiding hard collision and causing damage to the parts.

[0025] In the third embodiment, as a further preferred solution of the first embodiment, the moving contact 7 is arranged in a disc type structure. Thus, when the coil winding is energized to generate a magnetic field by applying a voltage pulse signal to the coil winding, the entire moving shaft 6 can rotate freely, and the rotation of the product during operation can also uniformly consume the upper circular surface of the moving contact 7, thereby also being conducive to improving the service life of the product.

[0026] In the fourth embodiment, as a further preferred solution of the first embodiment, the coil winding includes a first coil and a second coil, the winding directions of the first coil and the second coil are consistent, the beginning end of the first coil is provided with a first connecting terminal, the tail end of the second coil is provided with a second connecting terminal, the tail end of the first coil and the beginning end of the second coil are connected to form a common end, and a common connecting terminal is arranged on the common end.

[0027] Therefore, when connecting the power, the first connecting terminal and the second connecting terminal can be directly connected to the positive electrode of the power supply through the single-pole double-throw switch, and the common connecting terminal is connected to the negative electrode of the power supply. Therefore, when the contactor circuit needs to be turned on, the single-pole double-throw switch can be directly controlled to connect the first connecting terminal to the positive electrode of the power supply and disconnect the second connecting terminal from the positive electrode of the power supply, so that the first coil is energized to generate a magnetic field in the same direction as the magnetic field of the annular permanent magnet 10. When the contactor circuit needs to be turned off, the single-pole double-throw switch can be directly controlled to disconnect the first connecting terminal from the positive electrode of the power supply and connect the second connecting terminal to the positive electrode of the power supply, so that the second coil is energized to generate a magnetic field in the opposite direction of the magnetic field of the annular permanent magnet 10.

[0028] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A magnetic latching high voltage DC contactor, characterized by: The utility model relates to a ceramic shell (1) is divided into lower accommodating cavity and upper accommodating cavity with the installation bottom plate (2) of fixed installation in the cavity of ceramic shell (1) middle, the coil shell (3) of fixed installation is installed in the lower accommodating cavity, the coil winding is installed in the coil shell (3), the iron core shaft hole (4) is set up in the middle of coil shell (3), the movable iron core (5) of sliding installation is installed in the iron core shaft hole (4), the movable shaft (6) of fixed installation is installed in the middle of movable iron core (5), the movable shaft (6) upper end passes through the installation bottom plate (2) and is fixedly installed with the movable contact (7), the movable contact (7) is located in the upper accommodating cavity, the fixedly installed static contact (8) of ceramic shell (1) top, the static contact (8) lower surface and movable contact (7) upper surface movable contact, The annular permanent magnet (10) is installed in the annular placing groove (9) of the upper surface middle of coil shell (3), and the outer surface of movable iron core (5) and the inner ring surface of annular permanent magnet (10) are in movable contact.

2. A magnetic latching HVDC contactor according to claim 1, characterized in that: The movable shaft (6) outer surface is sleeved with spring (11), and the spring (11) is located between the movable contact (7) lower surface and the installation bottom plate (2) upper surface.

3. A magnetic latching HVDC contactor according to claim 1, characterized in that: The movable contact (7) is provided as a disc type structure.

4. A magnetic latching HVDC contactor according to claim 1, characterized in that: The coil winding includes a first coil and a second coil, the first coil and the second coil have the same winding direction, the first coil has a first terminal at a starting end, the second coil has a second terminal at a tail end, the tail end of the first coil is connected to the starting end of the second coil to form a common terminal, and the common terminal has a common terminal.

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