Contactor movable contact assembly and contactor

Abstract

To provide a contactor movable contact assembly with higher electrical insulation performance.SOLUTION: A contactor movable contact assembly includes: an installation frame; a movable terminal (4); an insulation top seat fixed to a magnetic top plate (11) of the installation frame or the movable terminal (4); and an auxiliary movable contact (3) fixed to the insulation top seat and electrically contacting an auxiliary static contact of a contactor. The insulation top seat has a first insulation member (21) and a second insulation member (22) for electrically isolating the auxiliary movable contact (3) from the magnetic top plate (11). The first insulation member (21) has a comparative tracking index lower than a maximum operating voltage allowed by the contactor. The second insulation member (22) has a comparative tracking index higher than the maximum operating voltage allowed by the contactor.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Chinese Patent Application No. CN202410125382.4, filed with the State Intellectual Property Office of China on January 29, 2024, the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to a movable contact assembly for a contactor, and to a contactor including a movable contact assembly for a contactor. [Background technology]

[0003] In the field of new energy, such as solar power generation and energy storage, the operating voltage requirements for contactors used there are becoming increasingly higher. Considerations are being raised from the commonly used 1000V to 1500V to 2000V or even higher. In conventional technologies, only ordinary insulating materials are typically used to electrically insulate the low-voltage drive shaft from the high-voltage components of the auxiliary moving contact assembly (e.g., moving terminal, spring). As the operating voltage increases, the insulation distance requirements imposed by safety regulations also increase. Meeting these requirements inevitably requires the use of more internal insulators or insulator designs with more complex structures. This significantly increases the overall product volume, manufacturing difficulty, and ultimately cost. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made to overcome or mitigate at least one aspect of the above disadvantages. [Means for solving the problem]

[0005] According to an aspect of the present invention, there is provided a movable contact assembly for a contactor, the movable contact assembly including a mounting frame including an insulating bottom seat, a movable terminal movably mounted on the mounting frame to electrically contact a stationary terminal of the contactor, a spring mounted on the mounting frame and floatingly supporting the movable terminal on the insulating bottom seat of the mounting frame, a drive shaft connected to the insulating bottom seat of the mounting frame for driving the mounting frame to move along the axial direction of the drive shaft, and a bottom insulating member mounted on the bottom of the insulating bottom seat and surrounding the drive shaft. The insulating bottom seat and the bottom insulating member are used to electrically insulate the drive shaft from the spring, and the insulating bottom seat has a comparative tracking index lower than the maximum operating voltage allowed by the contactor, and the bottom insulating member has a comparative tracking index higher than the maximum operating voltage allowed by the contactor.

[0006] According to an exemplary embodiment of the present invention, an insulating support is formed on the bottom surface of the insulating bottom seat, the upper end of the drive shaft is joined to the insulating support of the insulating bottom seat, an annular groove is formed in the insulating support of the insulating bottom seat, and the bottom insulating member is annular and engages with the annular groove of the insulating support.

[0007] According to another exemplary embodiment of the present invention, the insulating bottom seat is formed directly on the upper end of the drive shaft by an injection molding process, and the bottom insulating member is formed directly on the bottom of the insulating bottom seat by a secondary injection molding process.

[0008] According to another exemplary embodiment of the present invention, the mounting frame further includes a pair of conductive side plates fixed to the insulating base, and a magnetic top plate fixed between the upper portions of the pair of conductive side plates, wherein mounting slots are formed in the upper portions of the conductive side plates, and two ends of the magnetic top plate are inserted into the mounting slots of the pair of conductive side plates, respectively.

[0009] According to another exemplary embodiment of the present invention, the insulating base seat includes a pair of insulating side walls and an insulating bottom wall connected between the bottoms of the pair of insulating side walls, wherein the lower ends of the pair of conductive side plates are fixed to the pair of insulating side walls of the insulating base seat, respectively, and the upper end of the drive shaft is fixed to the insulating bottom wall of the insulating base seat.

[0010] According to another exemplary embodiment of the present invention, the insulating bottom seat is formed directly on the lower ends of the pair of conductive side plates and the upper end of the drive shaft by an injection molding process, and the bottom insulating member is formed directly on the bottom of the insulating bottom seat by a secondary injection molding process.

[0011] According to another exemplary embodiment of the present invention, the movable contact assembly for the contactor further includes a floatable seat, which is provided on the mounting frame and assembled to the movable terminal to float together with the movable terminal, and the spring is compressed between the floatable seat and the insulating bottom seat to floatably support the floatable seat and the movable terminal on the insulating bottom seat.

[0012] According to another exemplary embodiment of the present invention, a mounting notch is formed on each side of the movable terminal, a mounting flange is formed on each side of the floatable seat, and the mounting notch is embedded in the mounting notch.

[0013] According to another exemplary embodiment of the present invention, a first positioning pillar is formed on the bottom surface of the floating seat, and a second positioning pillar is formed inside the insulating bottom wall of the insulating bottom seat, and the first positioning pillar and the second positioning pillar are axially opposite each other and are inserted into the upper and lower ends of the spring, respectively, to position the spring.

[0014] According to another exemplary embodiment of the present invention, a movable contact assembly for a contactor further includes an insulating upper seat secured to the magnetic upper plate of the movable terminal or mounting frame, and an auxiliary movable contact secured to the insulating upper seat for electrical contact with the auxiliary stationary contact of the contactor, the insulating upper seat including a first insulating member and a second insulating member for electrically insulating the auxiliary movable contact from the magnetic upper plate, the first insulating member having a comparative tracking index lower than a maximum operating voltage allowed by the contactor, and the second insulating member having a comparative tracking index higher than the maximum operating voltage allowed by the contactor.

[0015] According to another exemplary embodiment of the present invention, the insulating upper seat is fixed to the magnetic upper plate of the mounting frame, and the portion of the auxiliary movable contact closest to the magnetic upper plate is housed in the second insulating member, and the portion of the auxiliary movable contact closest to the magnetic upper plate is electrically insulated from the magnetic upper plate by the second insulating member.

[0016] According to another exemplary embodiment of the present invention, the first insulating member has a first accommodating chamber, and the auxiliary movable contact and the second insulating member are accommodated in the first accommodating chamber of the first insulating member.

[0017] According to another exemplary embodiment of the present invention, the first insulating member includes a pair of side plates facing each other in a first direction perpendicular to the axial direction of the drive shaft, and a bottom plate connected between bottom portions of the pair of side plates, the first accommodating chamber being defined by the pair of side plates and the bottom plate, and the auxiliary movable contact and the second insulating member being fixed to the bottom plate.

[0018] According to another exemplary embodiment of the present invention, the auxiliary movable contact includes a fixed portion fixed to the bottom plate and an elastic portion suspended in the first accommodating chamber, the second insulating member has a second accommodating chamber, and the fixed portion of the auxiliary movable contact is closest to the magnetic top plate and is accommodated in the second accommodating chamber.

[0019] According to another exemplary embodiment of the present invention, the first insulating member has a first port and a second port opposite to each other in the axial direction and in a second direction perpendicular to the first direction, the second insulating member is positioned in the second port of the first insulating member and closes the second port, and the fixed portion of the auxiliary movable contact is positioned in the second accommodating chamber of the second insulating member.

[0020] According to another exemplary embodiment of the present invention, the second insulating member includes a pair of side walls facing each other in a first direction, a bottom wall connected between bottom portions of the pair of side walls, and an end wall connected between one ends of the pair of side walls, and the second storage chamber is defined by the pair of side walls, the bottom wall, and the end wall.

[0021] According to another exemplary embodiment of the present invention, a positioning post is formed on the inside of the bottom plate of the first insulating member, and positioning holes for cooperating with the positioning post are formed in the bottom wall of the second insulating member and the fixed portion of the auxiliary movable contact, respectively.

[0022] According to another exemplary embodiment of the present invention, the first insulating member has a pair of mounting portions respectively connected to the bottom outer sides of a pair of side plates, mounting holes are formed in the mounting portions, mounting posts corresponding to the mounting holes are formed on the upper surface of the magnetic upper plate, and the mounting posts are inserted into the mounting holes to attach the first insulating member to the magnetic upper plate.

[0023] According to another exemplary embodiment of the present invention, when the movable terminal moves to a closed position in electrical contact with the stationary terminal, the auxiliary movable contact moves to a closed position in electrical contact with the auxiliary stationary contact, and when the movable terminal moves to an open position away from the stationary terminal, the auxiliary movable contact moves to an open position away from the auxiliary stationary contact.

[0024] According to another aspect of the present invention, there is provided a contactor including a pair of stationary terminals, a coil used to generate an electromagnetic field, and a movable contact assembly for the contactor, wherein a drive shaft is configured to drive the movable terminal from an open position away from the stationary terminals to a closed position in electrical contact with the stationary terminals under the action of an electromagnetic force exerted by the electromagnetic field.

[0025] According to the above exemplary embodiment of the present invention, a special bottom insulating member is added to the normal insulating bottom seat. The comparative tracking index of the bottom insulating member is higher than the maximum operating voltage allowed by the contactor. Therefore, a higher electrical insulation performance can be achieved without increasing the size of the insulating bottom seat, and the low-voltage drive shaft can be safely and reliably isolated from the high-voltage conductive parts.

[0026] In the above exemplary embodiment of the present invention, a special second insulating member is added to the normal first insulating member. The comparative tracking index of the second insulating member is higher than the maximum operating voltage allowed by the contactor. This allows for higher electrical insulation performance without increasing the size of the insulating upper seat, thereby safely and reliably isolating the low-voltage auxiliary movable contact from the high-voltage conductive component.

[0027] These and other features of the present invention will become more apparent from the detailed description of illustrative embodiments taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is an illustrative perspective view of a movable terminal assembly for a contactor according to an exemplary embodiment of the present invention, viewed from one angle; [Figure 2] 1 is an axial cross-sectional view of a movable terminal assembly for a contactor according to an exemplary embodiment of the present invention. [Figure 3] 10 is a perspective view illustrating a movable terminal assembly for a contactor according to an exemplary embodiment of the present invention, viewed from another angle. FIG. [Figure 4] 1 is an illustrative exploded view of a movable terminal assembly for a contactor in accordance with an exemplary embodiment of the present invention; [Figure 5] 1 is an exploded cross-sectional view of a movable terminal assembly for a contactor in accordance with an exemplary embodiment of the present invention; [Figure 6] 2 is an exploded view of an insulating bottom seat and a bottom insulating member of a movable terminal assembly for a contactor according to an exemplary embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] Exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Like reference numerals refer to like elements throughout the drawings. However, the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art.

[0030] In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are diagrammatically shown to simplify the drawings.

[0031] According to a general aspect of the present invention, there is provided a movable contact assembly for a contactor, the movable contact assembly including a mounting frame including an insulating bottom seat, a movable terminal movably mounted on the mounting frame to electrically contact a stationary terminal of the contactor, a spring mounted on the mounting frame and floatably supporting the movable terminal on the insulating bottom seat of the mounting frame, a drive shaft connected to the insulating bottom seat of the mounting frame for driving the mounting frame to move along the axial direction of the drive shaft, and a bottom insulating member mounted on the bottom of the insulating bottom seat and surrounding the drive shaft. The insulating bottom seat and the bottom insulating member are used to electrically insulate the drive shaft from the spring, and the insulating bottom seat has a comparative tracking index lower than the maximum operating voltage allowed by the contactor, and the bottom insulating member has a comparative tracking index higher than the maximum operating voltage allowed by the contactor.

[0032] According to another general aspect of the present invention, there is provided a movable contact assembly for a contactor, the movable contact assembly including a mounting frame including a magnetic upper plate and an insulating bottom seat, a movable terminal movably mounted on the mounting frame for electrical contact with a stationary terminal of the contactor, a spring mounted on the mounting frame for floatably supporting the movable terminal on the insulating bottom seat of the mounting frame, an insulating upper seat fixed to the movable terminal or the magnetic upper plate of the mounting frame, an auxiliary movable contact fixed to the insulating upper seat for electrical contact with an auxiliary stationary contact of the contactor, and a drive shaft connected to the insulating bottom seat of the mounting frame and used to drive the mounting frame to move along its axial direction. The insulating upper seat includes a first insulating member and a second insulating member for electrically insulating the auxiliary movable contact from the magnetic upper plate, the first insulating member having a comparative tracking index lower than the maximum operating voltage allowed by the contactor, and the second insulating member having a comparative tracking index higher than the maximum operating voltage allowed by the contactor.

[0033] According to another general aspect of the present invention, there is provided a contactor including a pair of stationary terminals, a coil used to generate an electromagnetic field, and a movable contact assembly for the contactor, wherein a drive shaft is configured to drive the movable terminal from an open position away from the stationary terminals to a closed position in electrical contact with the stationary terminals under the action of an electromagnetic force exerted by the electromagnetic field.

[0034] FIG. 1 is an illustrative perspective view of a movable terminal assembly for a contactor according to an exemplary embodiment of the present invention, as viewed from one angle. FIG. 2 is an axial cross-sectional view of the movable terminal assembly for a contactor according to an exemplary embodiment of the present invention. FIG. 3 is an illustrative perspective view of the movable terminal assembly for a contactor according to an exemplary embodiment of the present invention, as viewed from another angle. FIG. 4 is an illustrative exploded view of the movable terminal assembly for a contactor according to an exemplary embodiment of the present invention. FIG. 5 is an exploded cross-sectional view of the movable terminal assembly for a contactor according to an exemplary embodiment of the present invention. FIG. 6 is an illustrative exploded view of an insulating bottom seat 12 and a bottom insulating member 8 of the movable terminal assembly for a contactor according to an exemplary embodiment of the present invention.

[0035] As shown in FIGS. 1 to 6 , an exemplary embodiment of the present invention also discloses a movable contact assembly for a contactor. The movable contact assembly for a contactor includes a mounting frame 1, a movable terminal 4, a drive shaft 5, a spring 6, and a bottom insulating member 8. The mounting frame 1 includes an insulating bottom seat 12. The movable terminal 4 is mounted on the mounting frame 1 and electrically contacts a stationary terminal (not shown) of the contactor. The spring 6 is mounted on the mounting frame 1 and floatably supports the movable terminal 4 on the insulating bottom seat 12 of the mounting frame 1. The drive shaft 5 is connected to the insulating bottom seat 12 of the mounting frame 1 and is used to drive the mounting frame 1 to move along the axial direction Z of the drive shaft 5. The bottom insulating member 8 is disposed at the bottom of the insulating bottom seat 12 and surrounds the drive shaft 5.

[0036] 1-6, in the illustrated embodiment, insulating bottom seat 12 and bottom insulating member 8 are used to electrically insulate low-voltage drive shaft 5 from high-voltage conductive components (such as movable terminal 4, conductive side plate 13, and spring 6). The comparative tracking index of insulating bottom seat 12 is lower than the maximum operating voltage allowed by the contactor, and the comparative tracking index of bottom insulating member 8 is higher than the maximum operating voltage allowed by the contactor.

[0037] As shown in Figures 1 to 6, in the illustrated embodiment, a special bottom insulating member 8 is added to the insulating bottom seat 12. The comparative tracking index of the bottom insulating member 8 is higher than the maximum operating voltage allowed by the contactor. Therefore, higher electrical insulation performance can be achieved without increasing the size of the insulating bottom seat, and the low-voltage drive shaft 5 can be safely and reliably isolated from high-voltage conductive components.

[0038] 1 to 6, in the illustrated embodiment, an insulating support 123 is formed on the bottom surface of the insulating bottom seat 12, and the upper end of the drive shaft 5 is joined to the insulating support 123 of the insulating bottom seat 12. An annular groove 12a is formed in the insulating support 123 of the insulating bottom seat 12, and the bottom insulating member 8 is annular and engages with the annular groove 12a of the insulating support 123.

[0039] As shown in Figures 1 to 6, in the illustrated embodiment, the insulating bottom seat 12 is formed directly on the upper end of the drive shaft 5 by an injection molding process, and the bottom insulating member 8 is formed directly on the bottom of the insulating bottom seat 12 by a secondary embedded injection molding process.

[0040] As shown in FIGS. 1 to 6, in the illustrated embodiment, the mounting frame 1 further includes a pair of conductive side plates 13 and a magnetic upper plate 11. The pair of conductive side plates 13 are fixed to an insulating base seat 12. The magnetic upper plate 11 is fixed between the upper portions of the pair of conductive side plates 13. Mounting slots 13a are formed in the upper portions of the conductive side plates 13, and the two ends of the magnetic upper plate 11 are inserted into the mounting slots 13a of the pair of conductive side plates 13, respectively.

[0041] 1 to 6, in the illustrated embodiment, the insulating bottom seat 12 includes a pair of insulating side walls 121 and an insulating bottom wall 122. The insulating bottom wall 122 is connected between the bottom portions of the pair of insulating side walls 121. The lower ends of the pair of conductive side plates 13 are fixed to the pair of insulating side walls 121 of the insulating bottom seat 12, respectively, and the upper end of the drive shaft 5 is fixed to the insulating bottom wall 122 of the insulating bottom seat 12.

[0042] As shown in Figures 1 to 6, in the illustrated embodiment, the insulating bottom seat 12 is formed directly on the lower ends of the pair of conductive side plates 13 and the upper end of the drive shaft 5 by an injection molding process, and the bottom insulating member 8 is formed directly on the bottom of the insulating bottom seat 12 by a secondary injection molding process.

[0043] 1 to 6 , in the illustrated embodiment, the movable contact assembly for a contactor further includes a floatable seat 7, which is provided on the mounting frame 1 and assembled to the movable terminal 4 to float together with the movable terminal 4. The spring 6 is compressed between the floatable seat 7 and the insulating bottom seat 12 to floatably support the floatable seat 7 and the movable terminal 4 on the insulating bottom seat 12.

[0044] As shown in Figures 1 to 6, in the illustrated embodiment, mounting notches 4a are formed on both sides of the movable terminal 4, mounting flanges 7a are formed on both sides of the floating seat 7, and the mounting notches 4a are embedded in the mounting notches 4a.

[0045] 1 to 6, in the illustrated embodiment, a first positioning pillar 7b is formed on the bottom surface of the floating seat 7, and a second positioning pillar 12b is formed inside the insulating bottom wall 122 of the insulating bottom seat 12. The first positioning pillar 7b and the second positioning pillar 12b are located on opposite sides in the axial direction and are inserted into the upper and lower ends of the spring 6, respectively, to position the spring 6.

[0046] 1 to 6, in the illustrated embodiment, the movable contact assembly for a contactor further includes an insulating upper seat 2 and an auxiliary movable contact 3. The insulating upper seat 2 is fixed to a magnetic upper plate 11 of a mounting frame 1. The auxiliary movable contact 3 is fixed to the insulating upper seat 2 and electrically contacts an auxiliary stationary contact (not shown) of the contactor. The insulating upper seat 2 includes a first insulating member 21 and a second insulating member 22 for electrically insulating the auxiliary movable contact 3 from the magnetic upper plate 11. The first insulating member 21 has a comparative tracking index lower than the maximum operating voltage allowed by the contactor, and the second insulating member 22 has a comparative tracking index higher than the maximum operating voltage allowed by the contactor.

[0047] As shown in Figures 1 to 6, in the illustrated embodiment, the portion of the auxiliary movable contact 3 closest to the magnetic upper plate 11 is housed in the second insulating member 22, and the portion of the auxiliary movable contact 3 closest to the magnetic upper plate 11 is electrically insulated from the magnetic upper plate 11 by the second insulating member 22.

[0048] As shown in Figures 1 to 6, in the illustrated embodiment, the first insulating member 21 has a first accommodating chamber 210, and the auxiliary movable contact 3 and the second insulating member 22 are accommodated in the first accommodating chamber 210 of the first insulating member 21.

[0049] 1 to 6, in the illustrated embodiment, the first insulating member 21 includes a pair of side plates 211 and a bottom plate 212. The pair of side plates 211 face each other in a first direction X that is perpendicular to the axial direction Z of the drive shaft 5. The bottom plate 212 is connected between the bottoms of the pair of side plates 211. The first accommodating chamber 210 is defined by the pair of side plates 211 and the bottom plate 212, and the auxiliary movable contact 3 and the second insulating member 22 are fixed to the bottom plate 212.

[0050] 1 to 6, in the illustrated embodiment, the auxiliary movable contact 3 includes a fixed portion 3a fixed to the bottom plate 212 and an elastic portion 3b suspended in the first accommodating chamber 210. The second insulating member 22 has a second accommodating chamber 220, and the fixed portion 3a of the auxiliary movable contact 3 is closest to the magnetic upper plate 11 and is accommodated in the second accommodating chamber 220.

[0051] 1 to 6 , in the illustrated embodiment, the first insulating member 21 has a first port and a second port 202 that are opposite to each other in the axial direction Z and a second direction Y that is perpendicular to the first direction X. The second insulating member 22 is positioned in the second port 202 of the first insulating member 21 and closes the second port 202. The fixed portion 3 a of the auxiliary movable contact 3 is positioned in the second accommodating chamber 220 of the second insulating member 22.

[0052] 1 to 6, in the illustrated embodiment, the second insulating member 22 includes a pair of side walls 221, a bottom wall 222, and an end wall 223. The pair of side walls 221 face each other in the first direction X. The bottom wall 222 is connected between bottom portions of the pair of side walls 221. The end wall 223 is connected between one ends of the pair of side walls 221. The second accommodating chamber 220 is defined by the pair of side walls 221, the bottom wall 222, and the end wall 223.

[0053] As shown in Figures 1 to 6, in the illustrated embodiment, a positioning pillar 21a is formed on the inside of the bottom plate 212 of the first insulating member 21, and positioning holes 22a cooperating with the positioning pillar 21a are formed in the bottom wall 222 of the second insulating member 22 and the fixed portion 3a of the auxiliary movable contact 3, respectively.

[0054] 1 to 6, in the illustrated embodiment, first insulating member 21 has a pair of mounting portions 213 connected to the outer bottom surfaces of a pair of side plates 211, and mounting holes 12b are formed in mounting portions 213. Mounting posts 11b corresponding to mounting holes 12b are provided on the upper surface of magnetic upper plate 11. Mounting posts 11b are inserted into mounting holes 12b to attach first insulating member 21 to magnetic upper plate 11.

[0055] 1 to 6, in the illustrated embodiment, the movable terminal 4 is configured to move between a closed position in electrical contact with the stationary terminal and an open position away from the stationary terminal when driven by the drive shaft 5. The auxiliary movable contact 3 is configured to move between a closed position in electrical contact with the auxiliary stationary contact and an open position away from the auxiliary stationary contact when driven by the drive shaft 5.

[0056] 1 to 6, in the illustrated embodiment, when the movable terminal 4 moves to a closed position where it is in electrical contact with the stationary terminal, the auxiliary movable contact 3 moves to a closed position where it is in electrical contact with the auxiliary stationary contact. When the movable terminal 4 moves to an open position where it is away from the stationary terminal, the auxiliary movable contact 3 moves to an open position where it is away from the auxiliary stationary contact.

[0057] As shown in FIGS. 1 to 6, another exemplary embodiment of the present invention also discloses a contactor. The contactor includes a pair of stationary terminals, a coil, and the above-described movable contact assembly for the contactor. The coil is used to generate an electromagnetic field. A drive shaft 5 is adapted to drive the movable terminal 4 from an open position away from the stationary terminal to a closed position in electrical contact with the stationary terminal by the action of an electromagnetic force applied by the electromagnetic field.

[0058] As shown in FIGS. 1 to 6 , another exemplary embodiment of the present invention discloses a movable contact assembly for a contactor. The movable contact assembly for a contactor includes a mounting frame 1, an insulating upper seat 2, an auxiliary movable contact 3, a movable terminal 4, a drive shaft 5, and a spring 6. The mounting frame 1 includes a magnetic upper plate 11 and an insulating bottom seat 12. The movable terminal 4 is provided on the mounting frame 1 and electrically contacts a stationary terminal (not shown) of the contactor. The spring 6 is attached to the mounting frame 1 and floatably supports the movable terminal 4 on the insulating bottom seat 12 of the mounting frame 1. The insulating upper seat 2 is fixed to the movable terminal 4 or the magnetic upper plate 11 of the mounting frame 1. The auxiliary movable contact 3 is fixed to the insulating upper seat 2 and electrically contacts the auxiliary stationary contact (not shown) of the contactor. The drive shaft 5 is connected to the insulating bottom seat 12 of the mounting frame 1 and is used to drive the mounting frame 1 to move along the axial direction Z of the drive shaft 5.

[0059] 1 to 6, in the illustrated embodiment, the insulating upper seat 2 is fixed to the magnetic upper plate 11 of the mounting frame 1. The insulating upper seat 2 includes a first insulating member 21 and a second insulating member 22 for electrically insulating the low-voltage auxiliary movable contact 3 from the high-voltage magnetic upper plate 11. The first insulating member 21 has a comparative tracking index lower than the maximum operating voltage allowed by the contactor, and the second insulating member 22 has a comparative tracking index higher than the maximum operating voltage allowed by the contactor.

[0060] 1 to 6, in the illustrated embodiment, a special second insulating member 22 is added to the first insulating member 21. The comparative tracking index of the second insulating member 22 is higher than the maximum allowable operating voltage of the contactor. Therefore, higher electrical insulation performance can be achieved without increasing the size of the insulating upper seat 2, and the low-voltage auxiliary movable contact 3 can be safely and reliably insulated from the high-voltage conductive component.

[0061] As shown in Figures 1 to 6, in the illustrated embodiment, the portion of the auxiliary movable contact 3 closest to the magnetic upper plate 11 is housed in the second insulating member 22, and the portion of the auxiliary movable contact 3 closest to the magnetic upper plate 11 is electrically insulated from the magnetic upper plate 11 by the second insulating member 22.

[0062] As shown in Figures 1 to 6, in the illustrated embodiment, the first insulating member 21 has a first accommodating chamber 210, and the auxiliary movable contact 3 and the second insulating member 22 are accommodated in the first accommodating chamber 210 of the first insulating member 21.

[0063] 1 to 6, in the illustrated embodiment, the first insulating member 21 includes a pair of side plates 211 and a bottom plate 212. The pair of side plates 211 face each other in a first direction X that is perpendicular to the axial direction Z of the drive shaft 5. The bottom plate 212 is connected between the bottoms of the pair of side plates 211. The first accommodating chamber 210 is defined by the pair of side plates 211 and the bottom plate 212, and the auxiliary movable contact 3 and the second insulating member 22 are fixed to the bottom plate 212.

[0064] 1 to 6, in the illustrated embodiment, the auxiliary movable contact 3 includes a fixed portion 3a fixed to the bottom plate 212 and an elastic portion 3b suspended in the first accommodating chamber 210. The second insulating member 22 has a second accommodating chamber 220, and the fixed portion 3a of the auxiliary movable contact 3 is closest to the magnetic upper plate 11 and is accommodated in the second accommodating chamber 220.

[0065] 1 to 6 , in the illustrated embodiment, the first insulating member 21 has a first port and a second port 202 that are opposite to each other in the axial direction Z and a second direction Y that is perpendicular to the first direction X. The second insulating member 22 is positioned in the second port 202 of the first insulating member 21 and closes the second port 202. The fixed portion 3 a of the auxiliary movable contact 3 is positioned in the second accommodating chamber 220 of the second insulating member 22.

[0066] 1 to 6, in the illustrated embodiment, the second insulating member 22 includes a pair of side walls 221, a bottom wall 222, and an end wall 223. The pair of side walls 221 face each other in the first direction X. The bottom wall 222 is connected between bottom portions of the pair of side walls 221. The end wall 223 is connected between one ends of the pair of side walls 221. The second accommodating chamber 220 is defined by the pair of side walls 221, the bottom wall 222, and the end wall 223.

[0067] As shown in Figures 1 to 6, in the illustrated embodiment, a positioning pillar 21a is formed on the inside of the bottom plate 212 of the first insulating member 21, and positioning holes 22a cooperating with the positioning pillar 21a are formed in the bottom wall 222 of the second insulating member 22 and the fixed portion 3a of the auxiliary movable contact 3, respectively.

[0068] 1 to 6, in the illustrated embodiment, first insulating member 21 has a pair of mounting portions 213 connected to the outer bottom surfaces of a pair of side plates 211, respectively, and mounting holes 12b are formed in mounting portions 213. Mounting posts 11b corresponding to mounting holes 12b are provided on the upper surface of magnetic upper plate 11. Mounting posts 11b are inserted into mounting holes 12b to attach first insulating member 21 to magnetic upper plate 11.

[0069] 1 to 6, in the illustrated embodiment, the mounting frame 1 further includes a pair of conductive side plates 13 fixed to the insulating bottom seat 12. The magnetic upper plate 11 is fixed between the upper portions of the pair of conductive side plates 13.

[0070] As shown in Figures 1 to 6, in the illustrated embodiment, mounting slots 13a are formed on the upper part of the conductive side plates 13, and the two ends of the magnetic upper plate 11 are inserted into the mounting slots 13a of the pair of conductive side plates 13, respectively.

[0071] 1 to 6, in the illustrated embodiment, the insulating bottom seat 12 includes a pair of insulating side walls 121 and an insulating bottom wall 122. The insulating bottom wall 122 is connected between the bottom portions of the pair of insulating side walls 121. The lower ends of the pair of conductive side plates 13 are fixed to the pair of insulating side walls 121 of the insulating bottom seat 12, respectively, and the upper end of the drive shaft 5 is fixed to the insulating bottom wall 122 of the insulating bottom seat 12.

[0072] As shown in Figures 1 to 6, in the illustrated embodiment, the insulating base seat 12 is formed directly on the lower ends of the pair of conductive side plates 13 and the upper end of the drive shaft 5 by an injection molding process, and therefore the insulating base seat 12, the mounting frame 1, and the drive shaft 5 are formed as a single piece.

[0073] It should be understood by those skilled in the art that the above embodiments are illustrative and not restrictive. For example, those skilled in the art can make many modifications to the above embodiments without any contradiction in structure or principle, and can freely combine various features described in different embodiments with each other.

[0074] While several exemplary embodiments have been shown and described, it will be apparent to those skilled in the art that various changes or modifications can be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the following claims and their equivalents.

[0075] As used herein, elements described in the singular and preceded by the word "a" or "an" should be understood as not excluding a plurality of said elements or steps, unless such exclusion is expressly stated. Furthermore, references to "one embodiment" of the invention are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Furthermore, unless expressly stated otherwise, embodiments "comprising" or "having" an element or elements having a particular characteristic can include additional such elements that do not have that characteristic.

Claims

1. A movable contact assembly for a contactor, comprising: a mounting frame (1) including an insulating bottom seat (12); a movable terminal (4) movably mounted on the mounting frame (1) so as to be in electrical contact with a stationary terminal of a contactor; a spring (6) provided on the mounting frame (1) for floatingly supporting the movable terminal (4) on the insulating bottom seat (12) of the mounting frame (1); a drive shaft (5) connected to the insulating bottom seat (12) of the mounting frame (1), for driving the mounting frame (1) to move along the axial direction (Z) of the drive shaft (5); a bottom insulating member (8) provided at the bottom of the insulating bottom seat (12) and surrounding the drive shaft (5); Equipped with The insulating bottom seat (12) and the bottom insulating member (8) are used to electrically insulate the drive shaft (5) from the spring (6), and the insulating bottom seat (12) has a comparative tracking index lower than the maximum operating voltage allowed by the contactor, and the bottom insulating member (8) has a comparative tracking index higher than the maximum operating voltage allowed by the contactor.

2. An insulating support (123) is formed on the bottom surface of the insulating bottom seat (12), and the upper end of the drive shaft (5) is joined to the insulating support (123) of the insulating bottom seat (12); 2. The movable contact assembly for a contactor according to claim 1, wherein an annular groove (12a) is formed in the insulating post (123) of the insulating bottom seat (12), and the bottom insulating member (8) is annular and engages with the annular groove (12a) of the insulating post (123).

3. 2. The movable contact assembly for a contactor according to claim 1, wherein the insulating bottom seat (12) is formed directly on the upper end of the drive shaft (5) by an injection molding process, and the bottom insulating member (8) is formed directly on the bottom of the insulating bottom seat (12) by a secondary injection molding process.

4. The mounting frame (1) A pair of conductive side plates (13) fixed to the insulating bottom seat (12); A magnetic upper plate (11) fixed between the upper portions of the pair of conductive side plates (13), further comprising 2. The movable contact assembly for a contactor according to claim 1, wherein mounting slots (13a) are formed in the upper part of the conductive side plates (13), and two ends of the magnetic upper plate (11) are inserted into the mounting slots (13a) of the pair of conductive side plates (13), respectively.

5. The insulating bottom seat (12) is A pair of insulating side walls (121); an insulating bottom wall (122) connected between the bottoms of the pair of insulating side walls (121); Including, 5. The movable contact assembly for a contactor according to claim 4, wherein lower ends of the pair of conductive side plates (13) are fixed to the pair of insulating side walls (121) of the insulating bottom seat (12), respectively, and an upper end of the drive shaft (5) is fixed to the insulating bottom wall (122) of the insulating bottom seat (12).

6. 5. The movable contact assembly for a contactor according to claim 4, wherein the insulating bottom seat (12) is directly formed on the lower ends of the pair of conductive side plates (13) and the upper end of the drive shaft (5) by an injection molding process, and the bottom insulating member (8) is directly formed on the bottom of the insulating bottom seat (12) by a secondary injection molding process.

7. The mounting frame (1) further includes a floating seat (7), the floating seat (7) being mounted on the movable terminal (4) and floating together with the movable terminal (4); 6. The movable contact assembly for a contactor according to claim 5, wherein the spring (6) is compressed between the floatable seat (7) and the insulating bottom seat (12) to floatably support the floatable seat (7) and the movable terminal (4) on the insulating bottom seat (12).

8. 8. The movable contact assembly for a contactor according to claim 7, wherein mounting notches (4a) are formed on both sides of the movable terminal (4), mounting flanges (7a) are formed on both sides of the floatable seat (7), and the mounting notches (4a) are embedded in the mounting notches (4a).

9. A first positioning pillar (7b) is formed on the bottom surface of the floating seat (7), and a second positioning pillar (12b) is formed on the inside of the insulating bottom wall (122) of the insulating bottom seat (12); 8. The movable contact assembly for a contactor according to claim 7, wherein the first positioning post (7b) and the second positioning post (12b) are axially opposite to each other and are inserted into the upper and lower ends of the spring (6), respectively, to position the spring (6).

10. a mounting frame (1) including a magnetic top plate (11) and an insulating bottom seat (12); a movable terminal (4) movably mounted on the mounting frame (1) so as to be in electrical contact with a stationary terminal of a contactor; a spring (6) provided on the mounting frame (1) for floatingly supporting the movable terminal (4) on the insulating bottom seat (12) of the mounting frame (1); an insulating upper seat (2) fixed to the movable terminal (4) or the magnetic upper plate (11) of the mounting frame (1); an auxiliary movable contact (3) fixed to the insulating upper seat (2) so as to be in electrical contact with an auxiliary stationary contact of the contactor; 5. The movable contact assembly for a contactor according to claim 4, wherein the insulating upper seat (2) includes a first insulating member (21) and a second insulating member (22) for electrically insulating the auxiliary movable contact (3) from the magnetic upper plate (11), the first insulating member (21) having a comparative tracking index lower than a maximum operating voltage allowed by the contactor, and the second insulating member (22) having a comparative tracking index higher than a maximum operating voltage allowed by the contactor.

11. 11. The movable contact assembly for a contactor according to claim 10, wherein the insulating upper seat (2) is fixed to the magnetic upper plate (11) of the mounting frame (1), and a portion of the auxiliary movable contact (3) closest to the magnetic upper plate (11) is housed in the second insulating member (22), and the portion of the auxiliary movable contact (3) closest to the magnetic upper plate (11) is electrically insulated from the magnetic upper plate (11) by the second insulating member (22).

12. 12. The movable contact assembly for a contactor according to claim 11, wherein the first insulating member (21) has a first accommodating chamber (210), and the auxiliary movable contact (3) and the second insulating member (22) are accommodated in the first accommodating chamber (210) of the first insulating member (21).

13. The first insulating member (21) is a pair of side plates (211) facing each other in a first direction (X) perpendicular to the axial direction (Z) of the drive shaft (5); A bottom plate (212) connected between the bottoms of the pair of side plates (211); Including, 13. The movable contact assembly for a contactor according to claim 12, wherein the first accommodating chamber (210) is defined by the pair of side plates (211) and the bottom plate (212), and the auxiliary movable contact (3) and the second insulating member (22) are fixed to the bottom plate (212).

14. The auxiliary movable contact (3) is a fixed portion (3a) fixed to the bottom plate (212); an elastic portion (3b) suspended in the first receiving chamber (210); Including, The second insulating member (22) has a second receiving chamber (220); 14. The movable contact assembly for a contactor according to claim 13, wherein the fixed portion (3a) of the auxiliary movable contact (3) is closest to the magnetic upper plate (11) and is accommodated in the second accommodating chamber (220).

15. The first insulating member (21) has a first port and a second port (202) opposite to each other in a second direction (Y) perpendicular to the axial direction (Z) and the first direction (X), the second insulating member (22) is positioned in the second port (202) of the first insulating member (21) to close the second port (202); 15. The movable contact assembly for a contactor according to claim 14, wherein the fixed portion (3a) of the auxiliary movable contact (3) is positioned in the second accommodating chamber (220) of the second insulating member (22).

16. The second insulating member (22) is A pair of side walls (221) facing each other in the first direction (X); a bottom wall (222) connected between the bottoms of the pair of side walls (221); An end wall (223) connected between one end of the pair of side walls (221); Including, 15. The movable contact assembly for a contactor according to claim 14, wherein the second accommodating chamber (220) is defined by the pair of side walls (221), the bottom wall (222), and the end wall (223).

17. 17. The movable contact assembly for a contactor according to claim 16, wherein a positioning post (21 a) is formed on the inside of the bottom plate (212) of the first insulating member (21), and positioning holes (22 a) for cooperating with the positioning post (21 a) are formed in the bottom wall (222) of the second insulating member (22) and the fixed portion (3 a) of the auxiliary movable contact (3), respectively.

18. The first insulating member (21) has a pair of mounting portions (213) respectively connected to the outer sides of the bottoms of the pair of side plates (211), and mounting holes (12b) are formed in the mounting portions (213); 14. The movable contact assembly for a contactor according to claim 13, wherein mounting posts (11b) corresponding to the mounting holes (12b) are formed on the upper surface of the magnetic upper plate (11), and the mounting posts (11b) are inserted into the mounting holes (12b) to attach the first insulating member (21) to the magnetic upper plate (11).

19. The movable terminal (4) is configured to move between a closed position in which it is in electrical contact with the stationary terminal and an open position in which it is separated from the stationary terminal by driving the drive shaft (5); 11. The movable contact assembly for a contactor according to claim 10, wherein the auxiliary movable contact (3) is configured to move between a closed position in which it is in electrical contact with the auxiliary stationary contact and an open position in which it is separated from the auxiliary stationary contact by driving the drive shaft (5).

20. When the movable terminal (4) moves to the closed position where it electrically contacts the stationary terminal, the auxiliary movable contact (3) moves to the closed position where it electrically contacts the auxiliary stationary contact; 20. The movable contact assembly for a contactor according to claim 19, wherein when the movable terminal (4) moves to the open position away from the stationary terminal, the auxiliary movable contact (3) moves to the open position away from the auxiliary stationary contact.

21. A contactor, a pair of static terminals; a coil used to generate an electromagnetic field; The movable contact assembly for a contactor according to any one of claims 1 to 20; Equipped with The drive shaft (5) is configured to drive the movable terminal (4) from an open position away from the stationary terminal to a closed position in electrical contact with the stationary terminal by the action of an electromagnetic force exerted by the electromagnetic field.

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