阅读说明：本技术 低磁耗推拉式双联转换直流接触器 (Low-magnetic-loss push-pull type duplex conversion direct current contactor ) 是由 戴丁志 戴孟仕 戴心怡 周树意 陈利军 于 2019-11-15 设计创作，主要内容包括：本发明公开了一种低磁耗推拉式双联转换直流接触器,由电磁构件、负载构件、壳体构件组成,其中电磁构件包括动铁芯(11)、静铁芯(13)、线圈、线圈架、导磁固定板(9),负载构件包括上接触片、下接触片、接触桥、顶柱、超程弹簧,在所述动铁芯与导磁固定板之间设有隔磁件(15)。所述隔磁件为自润滑轴承,该自润滑轴承套在动铁芯的外围上,且该自润滑轴承的内壁设有隔磁层。所述隔磁件为隔磁漆而设在动铁芯的外表面上。本发明通过隔磁件的设置,隔磁间隙更小,使得磁通损耗减少,从而提高了电磁利用率,且耐磨抗震、噪音低、耐高温,改善了接触器触点压力与技术性能,工作稳定可靠,提升了接触器产品质量,延长其使用寿命。(The invention discloses a low-magnetic-loss push-pull type duplex conversion direct current contactor, which consists of an electromagnetic component, a load component and a shell component, wherein the electromagnetic component comprises a movable iron core (11), a static iron core (13), a coil rack and a magnetic conduction fixing plate (9), the load component comprises an upper contact piece, a lower contact piece, a contact bridge, a top column and an over travel spring, and a magnetic isolation piece (15) is arranged between the movable iron core and the magnetic conduction fixing plate. The magnetism isolating part is a self-lubricating bearing which is sleeved on the periphery of the movable iron core, and a magnetism isolating layer is arranged on the inner wall of the self-lubricating bearing. The magnetism isolating piece is made of magnetism isolating paint and is arranged on the outer surface of the movable iron core. The invention has the advantages of improving the electromagnetic utilization rate, improving the contact pressure and the technical performance of the contactor, along with wear resistance, shock resistance, low noise, high temperature resistance, stable and reliable work, improving the product quality of the contactor and prolonging the service life of the contactor by arranging the magnetic isolation piece and reducing the magnetic flux loss.)

1. Low magnetic loss push-pull type duplex conversion direct current contactor comprises electromagnetism component, load component, casing component, and wherein the electromagnetism component includes movable iron core (11), quiet iron core (13), coil (16), coil former (12), magnetic conduction fixed plate (9), and the casing component includes upper cover shell (2), base (1), and the load component includes contact piece (6), lower contact piece (7), contact bridge, fore-set (18), overtravel spring (19), its characterized in that: and a magnetism isolating piece (15) is arranged between the movable iron core (11) and the magnetic conduction fixing plate (9).

2. The low-magnetic-loss push-pull duplex switching direct current contactor as claimed in claim 1, wherein: the magnetism isolating piece (15) is a self-lubricating bearing, the self-lubricating bearing is sleeved on the periphery of the movable iron core (11), and a magnetism isolating layer (21) is arranged on the inner wall of the self-lubricating bearing.

3. The low-magnetic-loss push-pull duplex switching direct current contactor as claimed in claim 1, wherein: the magnetism isolating piece (15) is made of magnetism isolating paint and is arranged on the outer surface of the movable iron core (11).

4. The low-magnetic-loss push-pull duplex switching direct current contactor as claimed in claim 2, wherein: the material of the magnetic isolating layer takes polytetrafluoroethylene as a main raw material.

5. The low-magnetic-loss push-pull duplex switching direct-current contactor as claimed in claim 3, wherein the enamel-insulated paint is made of polytetrafluoroethylene as a main raw material.

Technical Field

The present invention relates to a contactor for commutating or on-off controlling a current.

Background

The duplex converting DC contactor (belonging to a relay) is an electrical product equipped for controlling the power supply to a line and the conversion and commutation or on-off control of current, and is widely applied to engineering vehicles such as electric winches, forklifts, tractors, fork trucks and the like, industrial electrical control systems and the like.

The push-pull duplex switching direct current contactor generally comprises an electromagnetic component, a load component and a shell component, wherein: the electromagnetic component comprises a movable iron core, a static iron core, a coil (enameled wire), a coil rack, a magnetic conduction fixed plate, a magnetic conduction rack and the like, the shell component comprises an upper cover shell and a base, the load component comprises an upper contact piece, a lower contact piece, a contact bridge, a top column, an over travel spring and the like, and magnetic conduction components such as the magnetic conduction fixed plate, the magnetic conduction rack and the like and the coil rack wrap the coil and the movable iron core and the static iron core in a half-wrapping mode. The push-pull type is characterized in that the iron core is divided into a movable iron core and a static iron core by adopting a split structure design instead of an integral iron core design, and due to the structural characteristics of the push-pull type duplex conversion direct current contactor, the magnetic isolation gap between the movable iron core and the magnetic conduction fixing plate is large, magnetic flux is generated after the coil is electrified, the phenomenon of magnetic flux loss exists, the magnetic flux loss is large, and the electromagnetic utilization rate is low. Thereby affecting the technical performance of the contactor and producing bad effect on the applied electric appliance.

Disclosure of Invention

The invention aims to overcome the defects and provide the low-magnetic-loss push-pull type duplex conversion direct current contactor with small magnetic flux loss and high electromagnetic utilization rate.

The purpose of the invention is realized by the following technical scheme: a low-magnetic-loss push-pull type duplex conversion direct current contactor comprises an electromagnetic component, a load component and a shell component, wherein the electromagnetic component comprises a movable iron core, a static iron core, a coil rack and a magnetic conduction fixing plate, the shell component comprises an upper cover shell and a base, the load component comprises an upper contact piece, a lower contact piece, a contact bridge, a top column and an over travel spring, and a magnetic isolation piece is arranged between the movable iron core and the magnetic conduction fixing plate.

The magnetism isolating part is a self-lubricating bearing which is sleeved on the periphery of the movable iron core, and a magnetism isolating layer is arranged on the inner wall of the self-lubricating bearing. The magnetism isolating piece is made of magnetism isolating paint and is arranged on the outer surface of the movable iron core. The material of the magnetic isolating layer or the magnetic isolating paint takes polytetrafluoroethylene as a main raw material.

After the invention is adopted, the coil is integrally wrapped by the magnetism isolating piece (the self-lubricating bearing with the magnetism isolating layer or the magnetism isolating paint), the magnetism conducting fixed plate and the coil rack (and the magnetism conducting rack), the magnetism isolating gap is smaller, the magnetic flux generated by the coil is concentrated on the magnetic flux of the movable iron core when the coil, the movable iron core and the static iron core work is enlarged, the magnetic conductance of the pole shoe surface of the movable iron core is enhanced, the magnetic conductance and the magnetic field intensity of a working air gap are increased, the magnetic flux loss is reduced, and the electromagnetic utilization rate is improved. The contact pressure and the technical performance of the contactor (relay) are improved, the contactor works stably and reliably, the product quality of the contactor is improved, the service life of the contactor is prolonged, and the magnetic isolation piece is wear-resistant and high-temperature resistant. The structure is applied to the push-pull type duplex conversion direct current contactor, so that the vibration resistance of a contactor product is greatly improved compared with the conventional non-push-pull type similar products, and the vibration of the product and the noise generated during working are reduced. Thereby improving the mechanical life, high temperature resistance and vibration resistance of the product.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

FIG. 1 is a schematic structural view of the present invention (the magnetism isolating piece is magnetism isolating paint).

Fig. 2 is an enlarged schematic view of a portion labeled a in fig. 1.

Fig. 3 is a schematic structural view of another embodiment of the present invention (the magnetism isolating member is a self-lubricating bearing).

Fig. 4 is an enlarged schematic view of a portion marked B in fig. 3.

Detailed Description

Referring to fig. 1 to 4, the low magnetic loss push-pull type duplex switching dc contactor of the present invention is composed of an electromagnetic component (also called electromagnetic assembly), a load component and a shell component, wherein the electromagnetic component includes a movable iron core 11, a stationary iron core 13, a coil 16, a coil rack 12, a magnetic conduction fixing plate 9 (and a magnetic conduction rack 10), the shell component includes an upper cover shell 2 and a base 1, the load component includes an upper contact piece 6, a lower contact piece 7, a contact bridge, a top column 18 and an over travel spring 19, and a magnetic isolation piece 15 is arranged between the movable iron core 11 and the magnetic conduction fixing plate 9.

As can be seen from fig. 1 and 2, the magnetism isolating member 15 is provided on the outer surface of the movable iron core 11 as magnetism isolating paint (spraying method). Referring to fig. 3 and 4, as another embodiment, the magnetic isolation member 15 is a self-lubricating bearing (made of magnetic conductive steel material), which is sleeved on the outer periphery of the movable iron core 11, and the inner wall of the self-lubricating bearing is provided with a magnetic isolation layer 21. The magnetism isolating layer or the magnetism isolating paint both take Polytetrafluoroethylene (PTFE) as a main raw material and are thin magnetism isolating materials, so that the magnetism isolating effect is better, and the magnetic flux loss is lower.

Wherein, contact bridge includes middle contact bridge 17, curved contact bridge 5, middle contact bridge 17 contacts with curved contact bridge 5, upper contact piece 6, lower contact piece 7, and curved contact bridge 5, upper contact piece 6, lower contact piece 7 extensible to the base outside. And a return spring 8 is arranged between the movable iron core 11 and the static iron core 13.

When the contactor (relay) works, a coil (enameled wire) winds the movable iron core to generate a magnetic field, and the movable iron core is lifted through magnetic force, so that the overtravel spring drives the jack posts of the load component to lift, and the intermediate contact bridge is contacted with the upper contact piece and the bent contact bridge; and finally, the top column descends and the movable iron core also descends due to the return of the return spring. The contactor (relay) is mainly applied to the circuit on-off of a direct-current power supply load. The arrangement of the magnetism isolating piece (the self-lubricating bearing with the built-in magnetism isolating layer or magnetism isolating paint) enables the magnetism isolating clearance to be smaller, the magnetism isolating effect to be better, the magnetic flux loss to be lower, and the wrinkling problem of the magnetism isolating piece does not exist.