High voltage DC contactor

Abstract

This invention discloses a high-voltage DC contactor, comprising an arc-extinguishing cavity, two stationary contacts partially inserted into the arc-extinguishing cavity, a moving contact piece built into the arc-extinguishing cavity, a coil winding disposed outside the arc-extinguishing cavity, a moving iron core and an iron core shell disposed within the space enclosed by the coil winding, a push rod connected at one end to the moving iron core and at the other end to the moving contact piece, two auxiliary terminals partially inserted into the iron core shell, and an auxiliary spring piece disposed on the moving iron core. When the coil winding is energized or de-energized, the moving contact piece can be attracted and connected to one end of the two stationary contacts, and the auxiliary spring piece can be separated from one end of the two auxiliary terminals; or the moving contact piece can be separated from one end of the two stationary contacts, and the auxiliary spring piece can be contacted and connected to one end of the two auxiliary terminals. An insulating sealing structure with the same or similar coefficient of thermal expansion as the auxiliary terminals is provided between the auxiliary terminals and the iron core shell. This high-voltage DC contactor has high reliability, high safety, good airtightness, and long service life, meeting market demands.

Description

Technical Field

[0001] This invention relates to the field of contactor technology, and in particular to a high-voltage DC contactor with high reliability, high safety, good airtightness, and long service life. Background Technology

[0002] As is well known, high-voltage DC contactors typically have two sets of contact structures: one set is the main contact structure, used to control the opening and closing of the main circuit; the other set is the auxiliary contact structure, used to monitor the working status of the main contact structure.

[0003] Regarding the auxiliary contact structure, the commonly used implementation structure in the industry is as follows: it includes an auxiliary moving spring plate disposed in the arc-extinguishing cavity and fixedly connected to the push rod, and an auxiliary stationary contact plate also disposed in the arc-extinguishing cavity and cooperating with the auxiliary moving spring plate. When the push rod moves upward, it can cause the main contact structure to conduct and cause the auxiliary moving spring plate to separate from the auxiliary stationary contact plate; when the push rod moves downward, it can cause the main contact structure to disconnect and cause the auxiliary moving spring plate to contact and connect with the auxiliary stationary contact plate.

[0004] However, since the existing auxiliary contact structure is located inside the arc-extinguishing cavity, it is not only susceptible to arc contamination generated when the main contact structure is disconnected, but may also be burned and damaged in severe cases. Furthermore, it may be subject to high-voltage impacts caused by arc-extinguishing cavity failures, which adversely affects the functionality of the auxiliary contact structure, that is, it adversely affects the reliability and safety of the high-voltage DC contactor during operation.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] To overcome the above-mentioned defects, the present invention provides a high-voltage DC contactor, which has the advantages of simple and reasonable structure, small size, high reliability and safety, good airtightness, long service life and low processing cost, thus well meeting market demand.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: a high-voltage DC contactor, comprising an arc-extinguishing cavity, two stationary contacts, a moving contact piece, a coil winding, a moving iron core, and a push rod. The two stationary contacts are partially inserted into the arc-extinguishing cavity. The moving contact piece is movably housed within the arc-extinguishing cavity and positioned opposite one end of the two stationary contacts. The coil winding is positioned next to the outside of the arc-extinguishing cavity, and the moving iron core is movably disposed within the space enclosed by the coil winding. One end of the push rod is fixedly connected to the moving iron core, and the other end of the push rod is movably and sealed into the arc-extinguishing cavity and connected to the moving contact piece. When the coil winding is energized or de-energized, the moving contact piece can be attracted and connected to one end of the two stationary contacts. Alternatively, the coil windings can be separated; a core housing for accommodating the moving iron core is also positioned within the space enclosed by the coil windings; two auxiliary terminals and an elastic auxiliary spring are also provided. The two auxiliary terminals are fixedly disposed on the core housing with one end inserted into the core housing and the other end extending out of the core housing. The auxiliary spring is fixedly disposed on the moving iron core, and when the moving contact is engaged or disengaged from one end of the two stationary contacts, the auxiliary spring can be disengaged or contacted with one end of the two auxiliary terminals respectively; in addition, an insulating sealing structure is provided between the two auxiliary terminals and the core housing, and the thermal expansion coefficient of the insulating sealing structure is the same as or similar to that of the auxiliary terminals.

[0008] As a further improvement of the present invention, when the coil winding is energized, the moving iron core and the push rod can be driven to move in the forward direction along the axial direction of the push rod, thereby causing the moving contact to engage with one end of the two stationary contacts and causing the auxiliary spring to separate from one end of the two auxiliary terminals; when the coil winding is de-energized, the moving iron core and the push rod can be driven to move in the reverse direction along the axial direction of the push rod, thereby causing the moving contact to separate from one end of the two stationary contacts and causing the auxiliary spring to contact and connect with one end of the two auxiliary terminals.

[0009] As a further improvement of the present invention, the coil winding is defined to be located below the arc-extinguishing cavity, and correspondingly, the axes of the moving iron core and the push rod are both in the up-down direction and are coaxially connected.

[0010] The auxiliary spring is fixedly mounted on the bottom side of the moving iron core, and the two auxiliary terminals extend vertically and pass through the bottom wall of the iron core shell side by side.

[0011] As a further improvement of the present invention, the auxiliary spring is provided with a main body in the shape of a long strip, two curved portions extending upward from both ends of the main body in the length direction, and two connecting portions integrally connected to the upper ends of the two curved portions. The main body is used to contact and communicate with one end of the two auxiliary terminals at positions close to the two curved portions. The two curved portions are used to provide elastic restoring force to the main body, and the two connecting portions are used to be fixedly connected to the bottom side of the moving iron core.

[0012] As a further improvement of the present invention, the auxiliary spring is made of beryllium copper alloy material, and the two curved portions in the auxiliary spring are both C-shaped and arranged in a mirror symmetrical manner, so that the deformation of the main body is 0.4 to 0.8 mm.

[0013] As a further improvement of the present invention, the two connecting parts in the auxiliary spring are both inverted L-shaped and are also arranged in a mirror symmetrical manner, and the two connecting parts are fixedly connected to the bottom side of the moving iron core by any one of resistance welding, laser welding and riveting.

[0014] As a further improvement of the present invention, the iron core shell is provided with a hollow cylinder with an upper opening and a bottom closed, and two connecting rings formed side by side on the bottom wall of the hollow cylinder by a threading process. The two auxiliary terminals are respectively passed through the two connecting rings, and the insulating sealing structure is fixedly provided between the connecting rings and the auxiliary terminals.

[0015] As a further improvement of the present invention, the auxiliary terminal is made of Kovar alloy, and the insulating sealing structure is made of glass.

[0016] As a further improvement of the present invention, the coil winding is provided with a frame and a coil wound on the frame; the iron core shell is also provided with a connecting edge extending radially outward from the periphery of the upper opening side of the hollow cylinder, the hollow cylinder is inserted into the frame, and the connecting edge is fixedly overlapped on the upper side of the frame.

[0017] As a further improvement of the present invention, the high-voltage DC contactor further includes a housing, an arc-extinguishing shroud, a magnetic guide plate, a stationary iron core, and a return spring. The arc-extinguishing shroud has an opening on its lower side. The magnetic guide plate is sealed and fixedly connected to the lower opening side of the arc-extinguishing shroud, and together with the arc-extinguishing shroud, they enclose the arc-extinguishing cavity. The arc-extinguishing cavity and the coil winding are arranged vertically within the housing. The stationary iron core is partially inserted into the upper opening side of the hollow cylinder and is simultaneously fixedly connected to the magnetic guide plate. The return spring is sleeved on the push rod and elastically abuts against the stationary iron core and the moving iron core, respectively. In addition, the other ends of the two auxiliary terminals extend out of the housing for connection with external devices.

[0018] The beneficial effects of this invention are as follows: Compared with the traditional direct-acting contactor structure, the high-voltage DC contactor provided by this invention has the following advantages: ① The auxiliary contact structure is moved outside the arc-extinguishing cavity, thereby effectively avoiding arc pollution caused by the disconnection of the main contact structure and avoiding the impact of high voltage caused by the arc-extinguishing cavity failure on the auxiliary contact structure. This ensures that the auxiliary contact structure always operates under a safe voltage, significantly improving the reliability and safety of the high-voltage DC contactor during operation and ensuring its service life. Furthermore, the auxiliary contact structure is a normally closed contact structure; therefore, the stroke design of the moving iron core and the push rod only needs to consider meeting the working requirements of the main contact structure, thus simplifying the product's processing difficulty, reducing installation layout requirements, and facilitating product manufacturing. ② By designing the thermal expansion coefficient of the insulating sealing structure to be the same as or similar to that of the auxiliary terminal, it can be ensured that the insulating sealing structure is firmly connected to the auxiliary terminal, thereby ensuring the airtightness and service life of the high-voltage DC contactor. ③ The iron core housing has sufficient space for the installation of the auxiliary contact structure, which makes the assembly of the auxiliary contact structure more convenient and further reduces production costs. ④ The overall structure of the high-voltage DC contactor is simple and reasonable, small in size, easy to process and manufacture, and has low manufacturing costs, which is conducive to production implementation. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of the high-voltage DC contactor of the present invention in the conducting state.

[0020] Figure 2 for Figure 1 The diagram shows the assembly structure when the iron core shell, push rod, stationary iron core, auxiliary terminals, and auxiliary springs are assembled together.

[0021] Figure 3 for Figure 2 A cross-sectional schematic diagram of the assembly structure shown in the figure;

[0022] Figure 4 for Figure 3 The diagram shows the assembly structure when the moving iron core and the auxiliary spring are assembled together.

[0023] Figure 5 This is a cross-sectional structural diagram of the high-voltage DC contactor of the present invention in the open state;

[0024] Figure 6 for Figure 5 The diagram shows the assembly structure when the iron core shell, push rod, stationary iron core, auxiliary terminals, and auxiliary springs are assembled together.

[0025] Referring to the accompanying drawings, the following explanations are provided:

[0026] 1. Stationary contact; 2. Moving contact; 3. Coil winding; 30. Frame; 31. Coil; 4. Moving iron core; 5. Push rod; 6. Iron core shell; 60. Hollow cylinder; 61. Connecting ring; 62. Connecting edge; 7. Auxiliary terminal; 8. Auxiliary spring; 80. Main body; 81. Bending part; 82. Connecting part; 9. Insulation and sealing structure; 10. Shell; 11. Arc extinguishing hood; 12. Magnetic guide plate; 13. Stationary iron core; 14. Return spring; 15. Support; 16. Contact spring; 17. Yoke; 18. Magnetic guide ring. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Example:

[0028] Please see the appendix Figure 1 To be continued Figure 6As shown, this embodiment provides a high-voltage DC contactor, including a housing 10, and an arc-extinguishing cover 11, a magnetic plate 12, two stationary contacts 1, a moving contact 2, a coil winding 3, a stationary iron core 13, a moving iron core 4, a push rod 5, and a return spring 14, all of which are built into the housing 10. The arc-extinguishing cover 11 is a cover structure with an opening at the bottom. The magnetic plate 12 is sealed and fixedly connected to the lower opening side of the arc-extinguishing cover 11, and together with the arc-extinguishing cover 11, forms an arc-extinguishing cavity. The two stationary contacts 1 are fixedly disposed in the arc-extinguishing cover with one end inserted into the arc-extinguishing cavity and the other end extending out of the arc-extinguishing cavity. 11. That is, both stationary contacts 1 are partially inserted into the arc-extinguishing cavity, and the two stationary contacts 1 are arranged side by side, with the other end of each stationary contact 1 protruding from the outer casing 10 for connection to the wiring terminal. The moving contact 2 is movably built into the arc-extinguishing cavity and is simultaneously positioned opposite one end of each of the two stationary contacts 1. It can be understood that the two stationary contacts 1 and the moving contact 2 together constitute the main contact structure of the high-voltage DC contactor. The coil winding 3 is positioned below the arc-extinguishing cavity by the yoke 17, that is, the coil winding 3 is positioned below the magnetic plate 12 by the yoke 17. Within the space enclosed by the coil winding 3, a stationary iron core 13 and a moving iron core 4 are arranged vertically. The axes of both the stationary iron core 13 and the moving iron core 4 are vertical, and the stationary iron core 13 is also fixedly connected to the magnetic plate 12. The push rod 5 extends vertically (i.e., the axis of the push rod 5 is vertical), and the lower end of the push rod 5 is coaxial with and fixedly connected to the moving iron core 4 (a conventional threaded connection method can be used). After the upper end of the push rod 5 is inserted into the arc-extinguishing cavity in a movable and sealed manner, it is connected to the moving contact piece 2 through a combination of support 15, inverted U-shaped frame and contact spring 16 (a conventional technique in the field of contactors). (Section); The return spring 14 is sleeved on the push rod 5 and elastically abuts against the stationary iron core 13 and the moving iron core 4 respectively; When the coil winding 3 is energized, a magnetic circuit can be formed between the yoke 17, the magnetic plate 12, the stationary iron core 13 and the moving iron core 4, so that a magnetic attraction force is generated between the stationary iron core 13 and the moving iron core 4. Through this magnetic attraction force, the moving iron core 4 can be driven to move upward together with the push rod 5 (at which time the return spring 14 is compressed), thereby driving the moving contact 2 to be attracted and connected to one end of the two stationary contacts 1. At this time, the high-voltage DC contactor is in the conducting state (see Appendix). Figure 1 (As shown); when the coil winding 3 is de-energized, the moving iron core 4 and the push rod 5 can move downward together under their own weight and the elastic restoring force provided by the return spring 14, thereby causing the moving contact 2 to separate from one end of the two stationary contacts 1. At this time, the high-voltage DC contactor is in the open state (see Appendix). Figure 5 (As shown).

[0029] To improve the reliability, safety, airtightness, and service life of this high-voltage DC contactor, this embodiment also makes the following structural improvements and innovations to the high-voltage DC contactor: Please refer to the appendix. Figure 1 and attached Figure 5 As shown, a core housing 6 for accommodating the moving iron core 4 and a portion of the stationary iron core 13 is also positioned within the space enclosed by the coil winding 3. Additionally, two auxiliary terminals 7 and an elastic auxiliary spring 8 are provided. Both auxiliary terminals 7 and the auxiliary spring 8 are made of conductive material. The auxiliary spring 8 is fixedly disposed on the bottom side of the moving iron core 4. Both auxiliary terminals 7 are vertically extending rod-shaped structures, and are fixedly disposed on the bottom wall of the core housing 6 with one end inserted into the core housing 6 and the other end extending out of the core housing 6. Further, it can be understood that the two auxiliary terminals 7 are arranged side-by-side. The auxiliary terminals 7 pass through the bottom wall of the iron core housing 6, and their other ends extend out of the housing 10 for connection to external devices (such as status monitoring equipment, control circuit detection devices, or signal acquisition modules). Thus, when the coil winding 3 is energized, causing the moving contact 2 to engage with one end of the two stationary contacts 1, it also causes the auxiliary spring 8 to separate from one end of the two auxiliary terminals 7. Conversely, when the coil winding 3 is de-energized, causing the moving contact 2 to separate from one end of the two stationary contacts 1, it also causes the auxiliary spring 8 to contact one end of the two auxiliary terminals 7. Therefore, in this high-voltage DC contactor, the two auxiliary terminals 7 and the auxiliary spring 8 together constitute an auxiliary contact structure capable of reflecting the on / off state of the main contact structure, and the on / off state of the auxiliary contact structure is opposite to that of the main contact structure. Furthermore, compared to the prior art where the auxiliary contact structure is located within the arc-extinguishing cavity, this embodiment innovatively places the auxiliary contact structure outside the arc-extinguishing cavity. That is, this embodiment isolates the auxiliary contact structure from the arc-extinguishing cavity and sets them independently. This effectively avoids arc pollution caused by the disconnection of the main contact structure and prevents the impact of high voltage caused by arc-extinguishing cavity failure on the auxiliary contact structure. This ensures that the auxiliary contact structure can always operate under a safe voltage, thereby significantly improving the reliability and safety of the high-voltage DC contactor during operation and ensuring its service life. In addition, the auxiliary contact structure in this embodiment is a normally closed contact structure. Therefore, the stroke design of the moving iron core 4 and the push rod 5 only needs to consider meeting the working requirements of the main contact structure, simplifying the product's processing difficulty, reducing installation layout requirements, and facilitating product manufacturing.

[0030] Furthermore, based on the auxiliary contact structure provided in this embodiment, an insulating sealing structure 9 is also provided between each of the two auxiliary terminals 7 and the iron core housing 6, as detailed in the appendix. Figure 3 and attached Figure 6 As shown, and specifically, the coefficient of thermal expansion of the insulating sealing structure 9 is the same as or similar to that of the auxiliary terminal 7. Understandably, this embodiment, by configuring the insulating sealing structure 9, achieves electrical insulation between the auxiliary terminal 7 and the iron core housing 6, while also optimizing the thermal expansion coefficients of the insulating sealing structure 9 and the auxiliary terminal 7 as described above. This ensures that during the gradual cooling process after the insulating sealing structure 9 and the auxiliary terminal 7 are connected at high temperature, their contractions remain consistent, effectively avoiding stress concentration caused by differences in contraction. This ensures a firm connection between the insulating sealing structure 9 and the auxiliary terminal 7, thereby ensuring the airtightness and service life of the high-voltage DC contactor.

[0031] As can be seen from the above, compared with the traditional direct-acting contactor structure, the high-voltage DC contactor provided in this embodiment has the following advantages: ① The auxiliary contact structure is moved outside the arc-extinguishing cavity, thereby effectively avoiding arc pollution caused by the disconnection of the main contact structure and avoiding the impact of high voltage caused by the arc-extinguishing cavity failure on the auxiliary contact structure. This ensures that the auxiliary contact structure always operates under a safe voltage, significantly improving the reliability and safety of the high-voltage DC contactor during operation and ensuring its service life. In addition, the auxiliary contact structure is a normally closed contact structure, so the stroke design of the moving iron core 4 and the push rod 5 only needs to consider meeting the working requirements of the main contact structure, thereby simplifying the product processing difficulty, reducing the installation layout requirements, and facilitating product manufacturing. ② By designing the thermal expansion coefficient of the insulating sealing structure 9 to be the same as or similar to that of the auxiliary terminal 7, it can be ensured that the insulating sealing structure 9 and the auxiliary terminal 7 are firmly connected, thereby ensuring the airtightness and service life of the high-voltage DC contactor. ③The iron core housing 6 has sufficient space for the installation of the auxiliary contact structure, which makes the assembly of the auxiliary contact structure more convenient and further reduces the production cost.

[0032] The following provides a detailed description of the specific structure of the high-voltage DC contactor provided in this embodiment, particularly the specific structure of the auxiliary contact structure.

[0033] Please continue to refer to the appendix. Figure 3 Appendix Figure 4 and attached Figure 6As shown, in this embodiment, the auxiliary spring 8 preferably adopts the following structure: the auxiliary spring 8 has a main body 80 in the shape of a long strip, two curved portions 81 extending upward from both ends of the main body 80 along its length, and two connecting portions 82 integrally connected to the upper ends of the two curved portions 81. The main body 80, near the two curved portions 81, is used to contact and communicate with one end of the two auxiliary terminals 7. It is understood that the main body 80 extends along the parallel direction of the two auxiliary terminals 7. Furthermore, for ease of subsequent description, the main body 80 is also used to contact and communicate with one end of the two auxiliary terminals 7. The area that is in contact with and connected at one end is defined as the functional area; the two bent portions 81 are used to provide elastic restoring force to the main body 80, that is: when the main body 80 is in contact with and connected to one end of the two auxiliary terminals 7, the functional area on the main body 80 will deform under the action of the auxiliary terminals 7, and correspondingly, the ends of the two bent portions 81 that are close to the main body 80 will also deform accordingly. When the main body 80 is separated from one end of the two auxiliary terminals 7, the two bent portions 81 elastically reset and promote the elastic reset of the functional area on the main body 80; the two connecting portions 82 are used to be fixedly connected to the bottom side of the moving iron core 4.

[0034] Furthermore, the auxiliary spring 8 is preferably made of beryllium copper alloy, and the two bent portions 81 in the auxiliary spring 8 are preferably designed as C-shapes and arranged in a mirror symmetrical manner; so that the deformation of the main body 80 reaches 0.4-0.8 mm. It can be understood that by optimizing the deformation of the main body 80, it is possible to ensure that the main body 80 can provide sufficient contact pressure when in contact with the auxiliary terminal 7, and also to facilitate the return of the main body 80 to its original shape after separation from the auxiliary terminal 7.

[0035] Furthermore, in this embodiment, the two connecting parts 82 in the auxiliary spring 8 are preferably designed as inverted L-shapes and arranged in a mirror symmetrical manner, so that the two connecting parts 82 can be fixedly connected to the bottom side of the moving iron core 4 by any one of resistance welding, laser welding and riveting, thus ensuring the assembly quality.

[0036] Please continue to refer to the appendix. Figure 3 and attached Figure 6As shown, in this embodiment, the structure for the two auxiliary terminals 7 to pass side-by-side through the bottom wall of the core shell 6 is as follows: the core shell 6 has a hollow cylinder 60 with an upper opening and a closed bottom, and two connecting rings 61 formed side-by-side on the bottom wall of the hollow cylinder 60 by a threading process. The two auxiliary terminals 7 pass through the two connecting rings 61 respectively, and the insulating sealing structure 9 is fixedly provided between the connecting rings 61 and the auxiliary terminals 7. It can be understood that by processing the connecting rings 61 by the threading process, on the one hand, the connecting rings 61 and the hollow cylinder 60 can be integrally formed, reducing additional assembly steps and potential failure points, thereby improving the overall structural reliability of the core shell 6 and making the structure more compact; on the other hand, it allows for flexible and simple control of the axial length of the connecting rings 61, making the assembly process between the connecting rings 61, the insulating sealing structure 9, and the auxiliary terminals 7 more convenient and the resulting joint is more robust.

[0037] Furthermore, the core housing 6 is made of stainless steel, the auxiliary terminal 7 is made of Kovar alloy, and the insulating sealing structure 9 is made of glass. Understandably, the coefficient of thermal expansion of Kovar alloy (e.g., 4J29) is 4.7 × 10⁻⁶ within the temperature range of 20℃ to 450℃. -6 / ℃~6.4×10 -6 / ℃, the coefficient of thermal expansion of hard glass (such as 3C-5, 3C-8) is 4.6×10. -6 / ℃~5.2×10 -6 / ℃, meaning that the thermal expansion coefficients of Kovar alloy and hard glass are similar and highly matched. This ensures that during the gradual cooling process after the high-temperature bonding of Kovar alloy and hard glass, the shrinkage of the two is consistent, which can effectively avoid stress concentration caused by shrinkage differences and effectively prevent sealing failure or cracking.

[0038] Additional explanation: In this embodiment, a sintering process is preferably used to fix the iron core shell 6, the auxiliary terminal 7, and the insulating sealing structure 9 together. Specifically, the iron core shell 6 and the auxiliary terminal 7 are first pretreated (e.g., cleaned and pre-oxidized), then the glass powder is pressed into shape and assembled with the connecting ring 61 and the auxiliary terminal 7. Next, it is placed in a sintering furnace for high-temperature sintering, thereby fixing the iron core shell 6, the auxiliary terminal 7, and the insulating sealing structure 9 together.

[0039] Furthermore, based on the above-described structure of the core housing 6, the structure that enables the core housing 6 to be positioned within the space enclosed by the coil windings 3 is as follows: Please refer to the appendix. Figure 1 and attached Figure 2As shown, the coil winding 3 is provided with an I-shaped frame 30 and a coil 31 wound on the frame 30; the iron core shell 6 is also provided with a connecting edge 62 extending radially outward from the periphery of the upper opening side of the hollow cylinder 60, the hollow cylinder 60 is inserted into the frame 30, and the connecting edge 62 is fixedly overlapped on the upper side of the frame 30 by welding or riveting.

[0040] Furthermore, based on the above structure of the iron core shell 6, the stationary iron core 13 is configured to be partially inserted into the upper opening side of the hollow cylinder 60, so as to be arranged opposite to the moving iron core 4, which facilitates the generation of magnetic attraction between the stationary iron core 13 and the moving iron core 4 when the coil winding 3 is energized.

[0041] Finally, it should be noted that during the manufacturing process of the high-voltage DC contactor described in this embodiment, through holes are also provided on the stationary iron core 13 and the magnetic plate 12 for the push rod 5 to pass through. A magnetic ring 18 is also provided in the frame 30 and sleeved on the iron core shell 6. These are all conventional technical means in the field of high-voltage DC contactors, so they will not be described in detail here.

[0042] In summary, the high-voltage DC contactor provided in this application has the advantages of simple and reasonable structure, small size, high reliability and safety, good airtightness, long service life and low processing cost, which well meet the market demand.

[0043] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A high-voltage direct-current contactor comprising an arc-extinguishing chamber, two static contacts (1), a moving contact (2), a coil winding (3), a moving iron core (4) and a push rod (5), both of the static contacts (1) are partially inserted into the arc-extinguishing chamber, the moving contact (2) is movably arranged in the arc-extinguishing chamber and is arranged opposite to one end of both of the static contacts (1), the coil winding (3) is arranged below the arc-extinguishing chamber, and the moving iron core (4) is movably arranged in a space surrounded by the coil winding (3), the lower end of the push rod (5) is coaxial with and fixedly connected to the moving iron core (4), and the upper end of the push rod (5) is movably and sealingly inserted into the arc-extinguishing chamber and connected to the moving contact (2); when the coil winding (3) is turned on and off, the moving contact (2) can be brought into communication or separated from one end of both of the static contacts (1); characterized in that: In the space surrounded by the coil winding (3), an iron core shell (6) for accommodating the moving iron core (4) is also positioned and arranged, the iron core shell (6) is provided with a hollow cylinder (60) with an upper side opening and a bottom side closed, and two connecting ring bodies (61) are formed side by side on the bottom wall of the hollow cylinder (60) by a tooth extraction process; two auxiliary terminals (7) each extending vertically and an auxiliary spring leaf (8) made of beryllium copper alloy material are also provided, the upper ends of the two auxiliary terminals (7) are inserted into the iron core shell (6), the lower ends of the two auxiliary terminals (7) pass through the two connecting ring bodies (61) respectively, and an insulating sealing structure (9) is fixedly arranged between the connecting ring body (61) and the auxiliary terminal (7) by a sintering process, the thermal expansion coefficient of the insulating sealing structure (9) is the same as or close to that of the auxiliary terminal (7); the auxiliary spring leaf (8) is provided with a main body part (80) in the shape of a long strip, two bending parts (81) respectively bent and extended upwards from both ends of the length direction of the main body part (80), and two connecting parts (82) respectively integrally connected with the upper ends of the two bending parts (81), the main body part (80) is used as contact communication cooperation with the upper ends of the two auxiliary terminals (7) at positions close to the two bending parts (81) respectively, the two bending parts (81) are both in the shape of C and are mirror symmetrically arranged, so as to provide elastic restoring force to the main body part (80), and also make the deformation amount of the main body part (80) be 0.4-0.8mm; the two connecting parts (82) are used to be fixedly connected with the bottom side of the moving iron core (4); When the moving contact piece (2) and the two static contact heads (1) are in contact or separated at one end, the auxiliary spring leaf (8) can be separated or in contact communication with the upper ends of the two auxiliary terminals (7).

2. The high-voltage DC contactor of claim 1, wherein: When the coil winding (3) is energized, the moving iron core (4) and the push rod (5) can be driven to move upwards, thereby driving the moving contact piece (2) and the two static contact heads (1) to be in contact at one end, and driving the auxiliary spring leaf (8) and the upper ends of the two auxiliary terminals (7) to be separated; when the coil winding (3) is de-energized, the moving iron core (4) and the push rod (5) can be driven to move downwards, thereby driving the moving contact piece (2) and the two static contact heads (1) to be separated at one end, and driving the auxiliary spring leaf (8) and the upper ends of the two auxiliary terminals (7) to be in contact communication.

3. The HVDC contactor of claim 2, wherein: The two connecting parts (82) in the auxiliary spring leaf (8) are both in the shape of inverted L and are also mirror symmetrically arranged, and the two connecting parts (82) are fixedly connected to the bottom side of the moving iron core (4) by any one of resistance welding, laser welding and riveting.

4. The HVDC contactor of claim 2, wherein: The material of the auxiliary terminal (7) is Kovar alloy, and the material of the insulating sealing structure (9) is glass.

5. The HVDC contactor of claim 2, wherein: The coil winding (3) is provided with a frame (30) and a coil (31) wound on the frame (30); the iron core shell (6) is further provided with a connecting edge (62) radially extended outward from the upper opening side periphery of the hollow cylinder (60), the hollow cylinder (60) is inserted into the frame (30), and the connecting edge (62) is fixedly lapped on the upper side of the frame (30).

6. The HVDC contactor of claim 2, wherein: The high-voltage DC contactor further comprises a shell (10), an arc extinguishing cover (11), a magnetic conducting plate (12), a static iron core (13) and a reset spring (14), the arc extinguishing cover (11) is open at the lower side, the magnetic conducting plate (12) is sealingly and fixedly connected to the lower opening side of the arc extinguishing cover (11) and together with the arc extinguishing cover (11) forms the arc extinguishing cavity, and the arc extinguishing cavity and the coil winding (3) are arranged in the shell (10) in an up-down manner; the static iron core (13) is partially inserted into the upper opening side of the hollow cylinder (60) and is fixedly connected with the magnetic conducting plate (12), the reset spring (14) is sleeved on the push rod (5) and elastically abuts against the static iron core (13) and the moving iron core (4) respectively; In addition, the lower ends of the two auxiliary terminals (7) respectively extend out of the shell (10) for connection with external devices.

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