Contactor

Abstract

To provide a contactor with improved impact resistance performance of a product.SOLUTION: The electromagnetic relay includes an upper insulating housing (3), a movable terminal (2) movably disposed on the upper insulating housing (3), a pair of stationary terminals (1) located above the movable terminal (2) and fixed to the upper insulating housing (3), an insulating bracket (6) mounted on the upper insulating housing (3), an upper magnetic conductor (4), and a lower magnetic conductor assembled to the movable terminal (2) and moving synchronously with the movable terminal (2). The movable terminal (2) is movable along a vertical direction between an open position electrically separated from the pair of stationary terminals (1) and a closed position in electrical contact with the pair of stationary terminals (1). When the movable terminal (2) moves to the closed position, there is a certain gap between the upper magnetic conductor (4) and the lower magnetic conductor to prevent the upper magnetic conductor (4) from colliding with the lower magnetic conductor.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Chinese Patent Application No. CN202411124218.8, filed with the State Intellectual Property Office of China on August 15, 2024, the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to a contactor. [Background technology]

[0003] In the prior art, when a contactor coil is energized, its main contacts are closed, effectively connecting and transmitting current. When the contactor coil loses power, its main contacts are open, disconnecting the current. When the high-voltage circuit connected to the contactor is operating normally, the current transmitted by the contactor's main contacts is relatively stable and normal. However, when an abnormal condition, such as a short circuit, occurs in the high-voltage circuit, the abnormal current will have some effect on the load-bearing capacity and stability of the contactor's main contacts. High-voltage DC contactors are important devices in many electrical equipment, such as the electrical systems of new energy vehicles. When a surge current occurs between the moving and stationary contacts, the contactor will fail, causing unexpected and serious consequences. At the same time, the future development trend for new energy vehicles is high current and high voltage. When a high-voltage system fails, surge currents can reach 5kA or even 15kA or more. When such large currents flow through the moving and stationary contacts, strong electrical repulsive forces (including Lorentz and Holm forces) are generated in the main contact circuit. The direction of this electrical repulsive force is opposite to the direction of contact between the moving and stationary contacts, causing them to bounce open and resulting in a malfunction.

[0004] In the prior art, to resist the above-mentioned electrical repulsion force, an upper magnetic conductor and a lower magnetic conductor are typically attached to a contactor. The upper magnetic conductor is attached to a movable bracket within the contactor and is movable with the movable bracket. The lower magnetic conductor is attached to a movable terminal of the contactor and is movable with the movable terminal. When a short circuit occurs in the high-voltage circuit connected to the contactor, the upper and lower magnetic conductors are magnetized by the short-circuit current, causing the movable contact to generate an attractive force toward the stationary contact. This attractive force can counteract the effect of the Holm force and improve the contactor's ability to resist the short-circuit current. However, the drawback of the existing solution is that the upper magnet conductor and the movable bracket move together, which increases the total weight of the moving parts, increases the impact force, and reduces the impact resistance level. Under higher impact acceleration, the moving parts in the contactor may malfunction, such as the contactor closing incorrectly. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made to overcome or mitigate at least one aspect of the above disadvantages. [Means for solving the problem]

[0006] According to an aspect of the present invention, there is provided a contactor comprising: an upper insulating housing having an arc extinguishing chamber formed therein; a movable terminal movably mounted in the arc extinguishing chamber of the upper insulating housing; a pair of stationary terminals positioned above the movable terminal and fixed to the upper insulating housing; an insulating bracket attached to the arc extinguishing chamber of the upper insulating housing; an upper magnetic conductor fixed between the upper insulating housing and the insulating bracket and therefore stationary relative to the upper insulating housing; and a lower magnetic conductor assembled to the movable terminal and moving synchronously with the movable terminal. The movable terminal is vertically movable between an open position electrically isolated from the pair of stationary terminals and a closed position electrically in contact with the pair of stationary terminals. When the movable terminal is moved to the closed position, a predetermined gap is formed between the upper and lower magnetic conductors, preventing the upper magnetic conductor from colliding with the lower magnetic conductor.

[0007] According to an exemplary embodiment of the present invention, a positioning recess is formed on the upper part of the insulating bracket, a pressing protrusion is formed on the inside of the upper wall of the upper insulating housing, the upper magnetic conductor is positioned in the positioning recess of the insulating bracket, and the pressing protrusion is pressed against the upper surface of the upper magnetic conductor, thus fixing the upper magnetic conductor in a predetermined mounting position.

[0008] According to another exemplary embodiment of the present invention, a positioning recess is formed on the inside of the upper wall of the upper insulating housing, the upper magnetic conductor is positioned in the positioning recess, and the upper part of the insulating bracket is pressed against the bottom surface of the upper magnetic conductor, thus fixing the upper magnetic conductor in a predetermined mounting position.

[0009] According to another exemplary embodiment of the present invention, the stationary terminal has vertically opposed upper and lower ends, the upper end of the stationary terminal being exposed from the upper wall of the upper insulating housing for electrical connection to an external high voltage load circuit, and the lower end of the stationary terminal extending into the arc-extinguishing chamber for electrical contact with the movable terminal.

[0010] According to another exemplary embodiment of the present invention, stationary contacts are formed on the bottom surfaces of the lower ends of a pair of stationary terminals, respectively, and movable contacts are formed on the upper surfaces of the two ends of the movable terminal, respectively, so that when the movable terminals are moved to a closed position, the movable contacts on both ends of the movable terminal are in electrical contact with the stationary contacts of the pair of stationary terminals, respectively.

[0011] According to another exemplary embodiment of the present invention, the stationary terminal has horizontally opposed first and second ends and a pillar located between the first and second ends, the first end of the stationary terminal being exposed from one side wall of the upper insulating housing for electrical connection to an external high voltage load circuit, and the pillar of the stationary terminal extending into the arc-extinguishing chamber for electrical contact with the movable terminal.

[0012] According to another exemplary embodiment of the present invention, a second end of the static terminal is exposed from the other side wall of the upper insulating housing for thermal connection to an external cooling circuit, allowing the contactor to be cooled via the external cooling circuit and the static terminal.

[0013] According to another exemplary embodiment of the present invention, stationary contacts are formed on the bottom surfaces of the posts of a pair of stationary terminals, respectively, and movable contacts are formed on the top surfaces of the two ends of the movable terminal, respectively, so that when the movable terminals are moved to a closed position, the movable contacts on both ends of the movable terminal are in electrical contact with the stationary contacts of the pair of stationary terminals, respectively.

[0014] According to another exemplary embodiment of the present invention, the lower magnetic conductor is U-shaped, the movable terminal is assembled in the U-groove of the lower magnetic conductor, and the upper magnetic conductor is located above the upper opening of the lower magnetic conductor.

[0015] According to another exemplary embodiment of the present invention, the contactor further comprises a pair of magnetically blown magnets respectively fixed to a pair of side walls of the upper insulating housing and respectively adjacent to stationary contacts of the pair of stationary terminals, the pair of magnetically blown magnets being suitable for extinguishing an electric arc between the movable terminal and the stationary terminal by magnetic blow.

[0016] According to another exemplary embodiment of the present invention, slots are formed in a pair of side walls of the upper insulating housing, respectively, and a pair of magnetically blown magnets are inserted into the slots in the pair of side walls, respectively, the slots have insertion openings located on the bottom surface of the upper insulating housing, and the magnetically blown magnets are inserted into the slots in the side walls through the insertion openings.

[0017] According to another exemplary embodiment of the present invention, the insulating bracket includes a flange portion located at the bottom of the insulating bracket, which presses against the bottom surface of the magnetic blown magnet to hold the magnetic blown magnet in the slot.

[0018] According to another exemplary embodiment of the present invention, the contactor further includes an upper shielding shell provided in the upper insulating housing and surrounding the arc extinguishing chamber, and the upper insulating housing is directly molded to the upper shielding shell and the pair of stationary terminals by embedding injection molding, so that the upper insulating housing, the upper shielding shell, and the pair of stationary terminals are formed as a single piece.

[0019] According to another exemplary embodiment of the present invention, the contactor further comprises a lower insulating housing, the lower insulating housing having a receiving chamber formed therein and an upper portion of the lower insulating housing locked to a bottom portion of the upper insulating housing, a lower shielding shell provided in the lower insulating housing and fitted to the upper shielding shell, a coil assembly mounted in the receiving chamber of the lower insulating housing, and a magnetic conductive plate supported on an upper surface of the coil skeleton of the coil assembly. A flange portion of an insulating bracket is clamped between the magnetic conductive plate and the bottom surface of the upper insulating housing, so that the insulating bracket is stationary relative to the upper insulating housing.

[0020] According to another exemplary embodiment of the present invention, the contactor further includes an insulating base located in the arc extinguishing chamber, a contact spring compressed between the lower magnetic conductor and the insulating base to apply contact pressure to the movable terminal, and a limiting bracket fixed to the insulating base to limit the direction and distance of movement of the movable terminal relative to the insulating base.

[0021] According to another exemplary embodiment of the present invention, the contactor further comprises a drive shaft attached to the coil skeleton and having an upper end extending through the magnetic conductive plate into the arc-extinguishing chamber, the upper end of the drive shaft being fixed to an insulating base, which electrically insulates the upper end of the drive shaft from the contact spring and the limiting bracket.

[0022] According to another exemplary embodiment of the present invention, the insulating base is molded directly onto the drive shaft and limit bracket by embedding injection molding, so that the insulating base, drive shaft, and limit bracket are formed as a single piece.

[0023] According to another exemplary embodiment of the present invention, the contactor further includes an upper magnetic core located on the coil skeleton and fixed to the magnetic conductive plate, and a lower magnetic core movably provided on the coil skeleton and movable along the axial direction of the lower magnetic core, wherein a drive shaft passes through the upper and lower magnetic cores, and a lower end of the drive shaft is connected to the lower magnetic core and moves together with the lower magnetic core.

[0024] According to another exemplary embodiment of the present invention, the contactor further includes a return spring attached to the drive shaft and compressed between the upper and lower magnetic cores, wherein when the coil of the coil assembly is energized, the drive shaft drives the movable terminal to move from the open position to the closed position by the action of an electromagnetic force, and when the coil of the coil assembly is de-energized, the drive shaft drives the movable terminal to move from the closed position to the open position by the elastic return force of the return spring.

[0025] In the above exemplary embodiment of the present invention, the upper magnetic conductor is fixed between the upper insulating housing and the insulating bracket without moving. In the present invention, the upper magnetic conductor is fixed independently, reducing the weight of the moving parts and thereby reducing the large impact force caused by excessive weight and preventing product malfunction. Under the condition of a certain return spring force, the present invention can effectively improve the impact resistance of the product without sacrificing the short-circuit resistance performance.

[0026] These and other features of the present invention will become more apparent from the detailed description of illustrative embodiments of the invention taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a diagrammatic perspective view of a contactor according to an exemplary embodiment of the present invention; [Figure 2] 1 is a perspective cross-sectional view of a contactor according to an exemplary embodiment of the present invention; [Figure 3] FIG. 2 is another perspective cross-sectional view of a contactor according to an exemplary embodiment of the present invention. [Figure 4] 1 is a cross-sectional plan view of a contactor in accordance with an exemplary embodiment of the present invention in an open position in which the movable terminal is electrically isolated from the stationary terminal; [Figure 5] 1 is a cross-sectional plan view of a contactor in accordance with an exemplary embodiment of the present invention in a closed position in which the movable terminal is in electrical contact with the stationary terminal; [Figure 6] 1 is another cross-sectional plan view of a contactor in accordance with an exemplary embodiment of the present invention in a closed position in which the movable terminal is in electrical contact with the stationary terminal; [Figure 7] FIG. 10 is a diagrammatic perspective view, from one side, of a contactor according to another exemplary embodiment of the present invention. [Figure 8] FIG. 10 is a diagrammatic perspective view, seen from another side, of a contactor according to another exemplary embodiment of the present invention. [Figure 9] FIG. 10 is a diagrammatic perspective view of a contactor according to another exemplary embodiment of the present invention, with the upper insulating housing not shown. [Figure 10] FIG. 10 is a cross-sectional plan view of a contactor according to another exemplary embodiment of the present invention. [Figure 11] FIG. 10 is a diagrammatic top view of a contactor according to another exemplary embodiment of the present invention, without showing the upper insulating housing. DETAILED DESCRIPTION OF THE INVENTION

[0028] 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.

[0029] 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.

[0030] According to a general aspect of the present invention, there is provided a contactor comprising: an upper insulating housing having an arc extinguishing chamber formed therein; a movable terminal movably mounted in the arc extinguishing chamber of the upper insulating housing; a pair of stationary terminals located above the movable terminal and fixed to the upper insulating housing; an insulating bracket attached to the arc extinguishing chamber of the upper insulating housing; an upper magnetic conductor fixed between the upper insulating housing and the insulating bracket and therefore stationary relative to the upper insulating housing; and a lower magnetic conductor assembled to the movable terminal and moving synchronously with the movable terminal. The movable terminal is vertically movable between an open position electrically isolated from the pair of stationary terminals and a closed position electrically in contact with the pair of stationary terminals. When the movable terminal is moved to the closed position, a predetermined gap is formed between the upper and lower magnetic conductors, preventing the upper magnetic conductor from colliding with the lower magnetic conductor.

[0031] 1 to 6 show a first embodiment according to the present invention. Of these figures, Fig. 1 is an explanatory perspective view of a contactor according to an exemplary embodiment of the present invention, Fig. 2 is a perspective cross-sectional view of a contactor according to an exemplary embodiment of the present invention, Fig. 3 is another perspective cross-sectional view of a contactor according to an exemplary embodiment of the present invention, Fig. 4 is a plan cross-sectional view of a contactor according to an exemplary embodiment of the present invention in an open position in which a movable terminal 2 is electrically isolated from a stationary terminal 1, Fig. 5 is a plan cross-sectional view of a contactor according to an exemplary embodiment of the present invention in a closed position in which the movable terminal 2 is in electrical contact with the stationary terminal 1, and Fig. 6 is another plan cross-sectional view of a contactor according to an exemplary embodiment of the present invention in a closed position in which the movable terminal 2 is in electrical contact with the stationary terminal 1.

[0032] As shown in FIGS. 1 to 6 , a contactor is disclosed in an exemplary embodiment of the present invention. The contactor includes a pair of stationary terminals 1, a movable terminal 2, an upper insulating housing 3, an upper magnetic conductor 4, a lower magnetic conductor 5, and an insulating bracket 6. An arc extinguishing chamber 30 is formed in the upper insulating housing 3. The movable terminal 2 is movably provided in the arc extinguishing chamber 30 of the upper insulating housing 3. The pair of stationary terminals 1 are located above the movable terminal 2 and fixed to the upper insulating housing 3. The insulating bracket 6 is attached to the arc extinguishing chamber 30 of the upper insulating housing 3. The upper magnetic conductor 4 is fixed between the upper insulating housing 3 and the insulating bracket 6, and therefore the upper magnetic conductor 4 is stationary with respect to the upper insulating housing 3. The lower magnetic conductor 5 is assembled to the movable terminal 2 and moves in synchronization with the movable terminal 2. The movable terminal 2 is vertically movable between an open position where it is electrically isolated from the pair of stationary terminals 1 and a closed position where it is in electrical contact with the pair of stationary terminals 1. When the movable terminal 2 moves to the closed position, a predetermined gap is formed between the upper magnetic conductor 4 and the lower magnetic conductor 5, preventing the upper magnetic conductor 4 from colliding with the lower magnetic conductor 5.

[0033] 1 to 6, in the illustrated embodiment, a positioning recess is formed in the upper part of the insulating bracket 6, and a pressing protrusion 32 is formed on the inside of the upper wall of the upper insulating housing 3. The upper magnetic conductor 4 is positioned in the positioning recess of the insulating bracket 6, and the pressing protrusion 32 is pressed against the upper surface of the upper magnetic conductor 4, so that the upper magnetic conductor 4 is fixed in a predetermined mounting position.

[0034] 1-6, in the illustrated embodiment, the stationary terminal 1 has vertically opposed upper and lower ends. The upper end of the stationary terminal 1 is exposed from the upper wall of the upper insulating housing 3 for electrical connection to an external high-voltage load circuit (not shown). The lower end of the stationary terminal 1 extends into the arc extinguishing chamber 30 for electrical contact with the movable terminal 2.

[0035] 1 to 6, in the illustrated embodiment, stationary contacts 1a are formed on the bottom surfaces of the lower ends of a pair of stationary terminals 1, and movable contacts 2a are formed on the upper surfaces of the two ends of the movable terminal 2. When the movable terminal 2 moves to the closed position, the movable contacts 2a at both ends of the movable terminal 2 come into electrical contact with the stationary contacts 1a of the pair of stationary terminals 1.

[0036] As shown in Figures 1 to 6, in the illustrated embodiment, the lower magnetic conductor 5 is U-shaped, the movable terminal 2 is assembled in the U-shaped groove of the lower magnetic conductor 5, and the upper magnetic conductor 4 is positioned above the upper opening of the lower magnetic conductor 5.

[0037] 1 to 6, in the illustrated embodiment, the contactor further includes a pair of magnetically blown magnets 7 fixed to a pair of side walls of the upper insulating housing 3, respectively, and adjacent to the stationary contacts 1a of the pair of stationary terminals 1. The pair of magnetically blown magnets 7 are suitable for extinguishing an arc between the movable terminal 2 and the stationary terminal 1 by magnetic blow.

[0038] 1 to 6, in the illustrated embodiment, slots 33 are formed in each of a pair of side walls of the upper insulating housing 3, and a pair of magnetically blown magnets 7 are inserted into the slots 33 in the pair of side walls, respectively. The slots 33 have insertion openings located in the bottom surface of the upper insulating housing 3, and the magnetically blown magnets 7 are inserted into the slots 33 in the side walls through the insertion openings.

[0039] As shown in Figures 1 to 6, in the illustrated embodiment, the insulating bracket 6 includes a flange portion 61 located at the bottom of the insulating bracket 6, which abuts against the bottom surface of the magnetic blown magnet 7 to hold the magnetic blown magnet 7 in the slot 33.

[0040] 1 to 6, in the illustrated embodiment, the contactor further includes an upper shield shell 31 disposed in the upper insulating housing 3 and surrounding the arc extinguishing chamber 30. The upper insulating housing 3 is directly molded onto the upper shield shell 31 and the pair of stationary terminals 1 by embedding injection molding, and therefore the upper insulating housing 3, the upper shield shell 31, and the pair of stationary terminals 1 are formed as a single part.

[0041] As shown in FIGS. 1 to 6 , in the illustrated embodiment, the contactor further includes a lower insulating housing (not shown), a lower shielding shell (not shown), a coil assembly (not shown), and a magnetic conductive plate 9. A receiving chamber is formed in the lower insulating housing, and the upper part of the lower insulating housing is locked to the bottom of the upper insulating housing 3. The lower shielding shell is provided in the lower insulating housing and fits into the upper shielding shell 31. The coil assembly is attached to the receiving chamber of the lower insulating housing. The magnetic conductive plate 9 is supported on the upper surface of the coil skeleton of the coil assembly. A flange portion 61 of the insulating bracket 6 is clamped between the magnetic conductive plate 9 and the bottom surface of the upper insulating housing 3, and therefore the insulating bracket 6 is stationary relative to the upper insulating housing 3.

[0042] 1 to 6 , in the illustrated embodiment, the contactor further includes an insulating base 8, a contact spring 82, and a limiting bracket 81. The insulating base 8 is located in the arc extinguishing chamber 30. The contact spring 82 is compressed between the lower magnetic conductor 5 and the insulating base 8 to apply contact pressure to the movable terminal 2. The limiting bracket 81 is fixed to the insulating base 8 to limit the direction and distance of movement of the movable terminal 2 relative to the insulating base 8.

[0043] 1 to 6 , in the illustrated embodiment, the contactor further includes a drive shaft 90 disposed on the coil skeleton and having an upper end extending through the magnetic conductive plate 9 into the arc extinguishing chamber 30. The upper end of the drive shaft 90 is fixed to an insulating base 8, which electrically insulates the upper end of the drive shaft 90 from the contact spring 82 and the limiting bracket 81.

[0044] As shown in Figures 1 to 6, in the illustrated embodiment, the insulating base 8 is molded directly onto the drive shaft 90 and the limiting bracket 81 by embedded injection molding, and therefore the insulating base 8, drive shaft 90, and limiting bracket 81 are formed as a single piece.

[0045] 1 to 6, in the illustrated embodiment, the contactor further includes an upper magnetic core 91 and a lower magnetic core 92. The upper magnetic core 91 is located on the coil skeleton and fixed to the magnetic conductive plate 9. The lower magnetic core 92 is movably disposed on the coil skeleton and is movable along the axial direction of the lower magnetic core 92. A drive shaft 90 passes through the upper magnetic core 91 and the lower magnetic core 92, and a lower end of the drive shaft 90 is connected to the lower magnetic core 92 and moves together with the lower magnetic core 92.

[0046] 1-6, in the illustrated embodiment, the contactor further includes a return spring 93 attached to the drive shaft 90 and compressed between the upper magnetic core 91 and the lower magnetic core 92. When the coil of the coil assembly is energized, the drive shaft 90 drives the movable terminal 2 to move from the open position to the closed position by the action of electromagnetic force. When the coil of the coil assembly loses power, the drive shaft 90 drives the movable terminal 2 from the closed position to the open position by the elastic return force of the return spring 93.

[0047] Figures 7 to 11 show a second embodiment according to the present invention. Of these figures, Figure 7 is an explanatory perspective view of a contactor according to another exemplary embodiment of the present invention, seen from one side, Figure 8 is an explanatory perspective view of a contactor according to another exemplary embodiment of the present invention, seen from the other side, Figure 9 is an explanatory perspective view of a contactor according to another exemplary embodiment of the present invention, in which the upper insulating housing 3 is not shown, Figure 10 is a plan sectional view of a contactor according to another exemplary embodiment of the present invention, and Figure 11 is an explanatory plan view of a contactor according to another exemplary embodiment of the present invention, in which the upper insulating housing 3 is not shown.

[0048] The main difference between the second embodiment shown in Figures 7 to 11 and the first embodiment shown in Figures 1 to 6 is the structure of the static terminal. Similar and identical technical features can be referred to the first embodiment shown in Figures 1 to 6.

[0049] As shown in FIGS. 7 to 11 , a contactor is disclosed in another exemplary embodiment of the present invention. The contactor includes a pair of stationary terminals 1, a movable terminal 2, an upper insulating housing 3, an upper magnetic conductor 4, a lower magnetic conductor 5, and an insulating bracket 6. An arc extinguishing chamber 30 is formed in the upper insulating housing 3. The movable terminal 2 is movably provided in the arc extinguishing chamber 30 of the upper insulating housing 3. The pair of stationary terminals 1 are located above the movable terminal 2 and fixed to the upper insulating housing 3. The insulating bracket 6 is attached to the arc extinguishing chamber 30 of the upper insulating housing 3. The upper magnetic conductor 4 is fixed between the upper insulating housing 3 and the insulating bracket 6, and therefore the upper magnetic conductor 4 is stationary with respect to the upper insulating housing 3. The lower magnetic conductor 5 is assembled to the movable terminal 2 and moves in synchronization with the movable terminal 2. The movable terminal 2 is vertically movable between an open position where it is electrically isolated from the pair of stationary terminals 1 and a closed position where it is in electrical contact with the pair of stationary terminals 1. When the movable terminal 2 moves to the closed position, a predetermined gap is formed between the upper magnetic conductor 4 and the lower magnetic conductor 5, preventing the upper magnetic conductor 4 from colliding with the lower magnetic conductor 5.

[0050] 7 to 11, in the illustrated embodiment, a positioning recess is formed on the inside of the upper wall of the upper insulating housing 3, and the upper magnetic conductor 4 is positioned in the positioning recess. The top of the insulating bracket 6 is pressed against the bottom surface of the upper magnetic conductor 4, and therefore the upper magnetic conductor 4 is fixed in a predetermined mounting position.

[0051] 7 to 11, in the illustrated embodiment, the stationary terminal 1 has horizontally opposed first and second ends 11 and 12, and a pillar 13 located between the first and second ends 11 and 12. The first end 11 of the stationary terminal 1 is exposed from one side wall of the upper insulating housing 3 for electrical connection to an external high-voltage load circuit. The pillar 13 of the stationary terminal 1 extends into the arc-extinguishing chamber 30 for electrical contact with the movable terminal 2.

[0052] As shown in Figures 7 to 11, in the illustrated embodiment, the second end 12 of the static terminal 1 is exposed from the other side wall of the upper insulating housing 3 for thermal connection to an external cooling circuit, allowing the contactor to be cooled via the external cooling circuit and the static terminal 1.

[0053] 7 to 11, in the illustrated embodiment, stationary contacts 1a are formed on the bottom surfaces of the posts 13 of the pair of stationary terminals 1, respectively, and movable contacts 2a are formed on the upper surfaces of the two ends of the movable terminal 2, respectively. When the movable terminal 2 moves to the closed position, the movable contacts 2a at both ends of the movable terminal 2 come into electrical contact with the stationary contacts 1a of the pair of stationary terminals 1.

[0054] As shown in Figures 7 to 11, in the illustrated embodiment, the lower magnetic conductor 5 is U-shaped, the movable terminal 2 is assembled in the U-shaped groove of the lower magnetic conductor 5, and the upper magnetic conductor 4 is positioned above the upper opening of the lower magnetic conductor 5.

[0055] 7 to 11, in the illustrated embodiment, the contactor further includes a pair of magnetically blown magnets 7 fixed to a pair of side walls of the upper insulating housing 3, respectively, and adjacent to the stationary contacts 1a of the pair of stationary terminals 1. The pair of magnetically blown magnets 7 are suitable for extinguishing the arc between the movable terminal 2 and the stationary terminal 1 by magnetic blow.

[0056] 7 to 11, in the illustrated embodiment, slots 33 are formed in each of a pair of side walls of the upper insulating housing 3, and a pair of magnetically blown magnets 7 are inserted into the slots 33 in the pair of side walls, respectively. The slots 33 have insertion openings located in the bottom surface of the upper insulating housing 3, and the magnetically blown magnets 7 are inserted into the slots 33 in the side walls through the insertion openings.

[0057] As shown in Figures 7 to 11, in the illustrated embodiment, the insulating bracket 6 includes a flange portion 61 located at the bottom of the insulating bracket 6, which abuts against the bottom surface of the magnetic blown magnet 7 to hold the magnetic blown magnet 7 in the slot 33.

[0058] 7 to 11, in the illustrated embodiment, the contactor further includes an upper shield shell 31 disposed in the upper insulating housing 3 and surrounding the arc extinguishing chamber 30. The upper insulating housing 3 is directly molded onto the upper shield shell 31 and the pair of stationary terminals 1 by embedding injection molding, and therefore the upper insulating housing 3, the upper shield shell 31, and the pair of stationary terminals 1 are formed as a single part.

[0059] As shown in FIGS. 7 to 11 , in the illustrated embodiment, the contactor further includes a lower insulating housing (not shown), a lower shielding shell (not shown), a coil assembly (not shown), and a magnetic conductive plate 9. A receiving chamber is formed in the lower insulating housing, and the upper part of the lower insulating housing is locked to the bottom of the upper insulating housing 3. The lower shielding shell is provided in the lower insulating housing and fits into the upper shielding shell 31. The coil assembly is attached to the receiving chamber of the lower insulating housing. The magnetic conductive plate 9 is supported on the upper surface of the coil skeleton of the coil assembly. The flange portion 61 of the insulating bracket 6 is clamped between the magnetic conductive plate 9 and the bottom surface of the upper insulating housing 3, and therefore the insulating bracket 6 is stationary relative to the upper insulating housing 3.

[0060] 7 to 11 , in the illustrated embodiment, the contactor further includes an insulating base 8, a contact spring 82, and a limiting bracket 81. The insulating base 8 is located in the arc extinguishing chamber 30. The contact spring 82 is compressed between the lower magnetic conductor 5 and the insulating base 8 to apply contact pressure to the movable terminal 2. The limiting bracket 81 is fixed to the insulating base 8 to limit the direction and distance of movement of the movable terminal 2 relative to the insulating base 8.

[0061] 7 to 11 , in the illustrated embodiment, the contactor further includes a drive shaft 90 disposed on the coil skeleton and having an upper end extending through the magnetic conductive plate 9 into the arc extinguishing chamber 30. The upper end of the drive shaft 90 is fixed to an insulating base 8. The insulating base 8 electrically insulates the upper end of the drive shaft 90 from the contact spring 82 and the limiting bracket 81.

[0062] As shown in Figures 7 to 11, in the illustrated embodiment, the insulating base 8 is molded directly onto the drive shaft 90 and the limiting bracket 81 by embedded injection molding, and therefore the insulating base 8, drive shaft 90, and limiting bracket 81 are formed as a single piece.

[0063] 7 to 11, in the illustrated embodiment, the contactor further includes an upper magnetic core 91 and a lower magnetic core 92. The upper magnetic core 91 is located on the coil skeleton and fixed to the magnetic conductive plate 9. The lower magnetic core 92 is movably disposed on the coil skeleton and is movable along the axial direction of the lower magnetic core 92. The drive shaft 90 passes through the upper magnetic core 91 and the lower magnetic core 92, and the lower end of the drive shaft 90 is connected to the lower magnetic core 92 and moves together with the lower magnetic core 92.

[0064] 7-11 , in the illustrated embodiment, the contactor further includes a return spring 93 attached to the drive shaft 90 and compressed between the upper magnetic core 91 and the lower magnetic core 92. When the coil of the coil assembly is energized, the drive shaft 90 drives the movable terminal 2 to move from the open position to the closed position by the action of electromagnetic force. When the coil of the coil assembly loses power, the drive shaft 90 drives the movable terminal 2 from the closed position to the open position by the elastic return force of the return spring 93.

[0065] 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.

[0066] While several exemplary embodiments have been shown and described, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined in the following claims and their equivalents.

[0067] As used herein, elements described in the singular and preceded by the word "a" or "an" should be understood as not excluding a plural 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 may include additional such elements that do not have that characteristic.

Claims

1. A contactor, an upper insulating housing (3) in which an arc extinguishing chamber (30) is formed; a movable terminal (2) movably provided in the arc extinguishing chamber (30) of the upper insulating housing (3); a pair of stationary terminals (1) located above the movable terminals (2) and fixed to the upper insulating housing (3); an insulating bracket (6) attached to the arc extinguishing chamber (30) of the upper insulating housing (3); an upper magnetic conductor (4) fixed between the upper insulating housing (3) and the insulating bracket (6), so that the upper magnetic conductor (4) is stationary relative to the upper insulating housing (3); a lower magnetic conductor (5) assembled to the movable terminal (2) and moving in synchronization with the movable terminal (2); Equipped with The movable terminal (2) is movable along a vertical direction between an open position where it is electrically isolated from the pair of stationary terminals (1) and a closed position where it is in electrical contact with the pair of stationary terminals (1); When the movable terminal (2) moves to the closed position, a predetermined gap is formed between the upper magnetic conductor (4) and the lower magnetic conductor (5), preventing the upper magnetic conductor (4) from colliding with the lower magnetic conductor (5).

2. 2. The contactor according to claim 1, wherein a positioning recess is formed in the upper part of the insulating bracket (6), a pressing protrusion (32) is formed on the inside of the upper wall of the upper insulating housing (3), the upper magnetic conductor (4) is positioned in the positioning recess of the insulating bracket (6), and the pressing protrusion (32) is pressed against the upper surface of the upper magnetic conductor (4), thereby fixing the upper magnetic conductor (4) in a predetermined mounting position.

3. 2. The contactor according to claim 1, wherein a positioning recess is formed on the inside of the upper wall of the upper insulating housing (3), the upper magnetic conductor (4) is positioned in the positioning recess, and the upper part of the insulating bracket (6) is pressed against the bottom surface of the upper magnetic conductor (4), thereby fixing the upper magnetic conductor (4) in a predetermined mounting position.

4. the stationary terminal (1) has an upper end and a lower end that are opposite in the vertical direction, the upper end of the stationary terminal (1) being exposed from an upper wall of the upper insulating housing (3) for electrical connection to an external high voltage load circuit; 2. The contactor of claim 1, wherein the lower end of the stationary terminal (1) extends into the arc-extinguishing chamber (30) for electrical contact with the movable terminal (2).

5. A stationary contact (1a) is formed on the bottom surface of the lower end of each of the pair of stationary terminals (1), and a movable contact (2a) is formed on the upper surface of each of the two ends of the movable terminal (2), 5. The contactor of claim 4, wherein when the movable terminal (2) is moved to the closed position, the movable contacts (2a) at both ends of the movable terminal (2) are in electrical contact with the stationary contacts (1a) of the pair of stationary terminals (1), respectively.

6. The stationary terminal (1) has horizontally opposite first and second ends (11) and (12), and a post (13) located between the first and second ends (11) and (12); the first end (11) of the stationary terminal (1) is exposed from one side wall of the upper insulating housing (3) for electrical connection to an external high voltage load circuit; 2. The contactor of claim 1, wherein the post (13) of the stationary terminal (1) extends into the arc-extinguishing chamber (30) for electrical contact with the movable terminal (2).

7. 7. The contactor according to claim 6, wherein the second end (12) of the stationary terminal (1) is exposed from the other side wall of the upper insulating housing (3) for thermal connection to an external cooling circuit, so that the contactor can be cooled via the external cooling circuit and the stationary terminal (1).

8. Stationary contacts (1a) are formed on the bottom surfaces of the posts (13) of the pair of stationary terminals (1), respectively, and movable contacts (2a) are formed on the top surfaces of the two ends of the movable terminal (2), respectively; 8. The contactor of claim 7, wherein when the movable terminal (2) is moved to the closed position, the movable contacts (2a) at both ends of the movable terminal (2) are in electrical contact with the stationary contacts (1a) of the pair of stationary terminals (1), respectively.

9. 2. The contactor of claim 1, wherein the lower magnetic conductor (5) is U-shaped, the movable terminal (2) is assembled in a U-shaped groove of the lower magnetic conductor (5), and the upper magnetic conductor (4) is positioned above an upper opening of the lower magnetic conductor (5).

10. The apparatus further comprises a pair of magnetically blown magnets (7) fixed to a pair of side walls of the upper insulating housing (3) and adjacent to the stationary contacts (1 a) of the pair of stationary terminals (1), 10. The contactor according to any one of claims 1 to 9, wherein the pair of magnetically blown magnets (7) are suitable for extinguishing an electric arc between the movable terminal (2) and the stationary terminal (1) by magnetic blow.

11. A slot (33) is formed in each of a pair of side walls of the upper insulating housing (3), and the pair of magnetic blow magnets (7) are inserted into the slots (33) in the pair of side walls, respectively; 11. The contactor according to claim 10, wherein the slot (33) has an insertion opening located on the bottom surface of the upper insulating housing (3), and the magnetic blown magnet (7) is inserted into the slot (33) in the side wall through the insertion opening.

12. 12. The contactor of claim 11, wherein the insulating bracket (6) includes a flange portion (61) located at the bottom of the insulating bracket (6), the flange portion (61) being pressed against the bottom surface of the magnetically blown magnet (7) to hold the magnetically blown magnet (7) in the slot (33).

13. The arc extinguishing chamber (30) is provided with an upper shield shell (31) disposed in the upper insulating housing (3).

13. The contactor of claim 12, wherein the upper insulating housing (3) is directly molded onto the upper shielding shell (31) and the pair of stationary terminals (1) by embedding injection molding, and thus the upper insulating housing (3), the upper shielding shell (31), and the pair of stationary terminals (1) are formed as a single part.

14. a lower insulating housing, the lower insulating housing having a receiving chamber formed therein, the upper part of the lower insulating housing being locked to the bottom of the upper insulating housing (3); a lower shield shell provided in the lower insulating housing and fitted to the upper shield shell (31); a coil assembly mounted in the receiving chamber of the lower insulating housing; a magnetic conductive plate (9) supported on the upper surface of the coil skeleton of the coil assembly; Furthermore, 14. The contactor of claim 13, wherein the flange portion (61) of the insulating bracket (6) is clamped between the magnetic conductive plate (9) and the bottom surface of the upper insulating housing (3), and therefore the insulating bracket (6) is stationary relative to the upper insulating housing (3).

15. an insulating base (8) located in the arc extinguishing chamber (30); a contact spring (82) compressed between the lower magnetic conductor (5) and the insulating base (8) to apply contact pressure to the movable terminal (2); a limiting bracket (81) fixed to the insulating base (8) to limit the direction and distance of movement of the movable terminal (2) relative to the insulating base (8); 15. The contactor of claim 14, further comprising:

16. a drive shaft (90) attached to the coil skeleton, the upper end of the drive shaft (90) extending through the magnetic conductive plate (9) into the arc extinguishing chamber (30); 16. The contactor of claim 15, wherein the upper end of the drive shaft (90) is fixed to the insulating base (8), and the insulating base (8) electrically insulates the upper end of the drive shaft (90) from the contact spring (82) and the limit bracket (81).

17. 17. The contactor of claim 16, wherein the insulating base (8) is molded directly onto the drive shaft (90) and the limiting bracket (81) by embedding injection molding, so that the insulating base (8), the drive shaft (90), and the limiting bracket (81) are formed as a single piece.

18. an upper magnetic core (91) located on the coil framework and fixed to the magnetic conductive plate (9); a lower magnetic core (92) movably provided on the coil skeleton and movable along the axial direction of the lower magnetic core (92); Furthermore, 17. The contactor of claim 16, wherein the drive shaft (90) passes through the upper magnetic core (91) and the lower magnetic core (92), and a lower end of the drive shaft (90) is connected to the lower magnetic core (92) and moves together with the lower magnetic core (92).

19. The drive shaft (90) further includes a return spring (93) that is attached to the drive shaft (90) and compressed between the upper core (91) and the lower core (92), When the coil of the coil assembly is energized, the drive shaft (90) drives the movable terminal (2) to move from the open position to the closed position by the action of electromagnetic force; 19. The contactor according to claim 18, wherein when the coil of the coil assembly is de-energized, the drive shaft (90) drives the movable terminal (2) to move from the closed position to the open position by the elastic restoring force of the return spring (93).

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