DC contactor

Abstract

The invention relates to the technical field of direct current contactors, and discloses a direct current contactor. The direct current contactor comprises a driving device, a plastic shell, a movable contact piece and two connecting copper bars, the movable contact piece is arranged in the plastic shell, and the driving device is configured to be capable of driving the movable contact piece to be close to or away from the driving device; the connecting copper bar is provided with a first contact, the movable contact piece is provided with two second contacts, and the second contacts can be selectively conducted with the first contacts in a one-to-one correspondence mode; the connecting copper bar at least partially extends out of the plastic shell. The moving contact is arranged in the plastic shell, the plastic shell not only can protect the moving contact, but also has an electrical isolation effect, so that the direct current contactor can be applied to some scenes with relatively low requirements on electrical performance, and compared with a ceramic structure, the plastic shell is simpler in manufacturing process and further lower in cost; and the economical efficiency of the direct current contactor can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current contactors, and in particular to a direct current contactor. Background Art

[0002] A high-voltage DC contactor is a key component used in high-voltage electrical equipment. This contactor can open or close a circuit without human intervention to control the flow of direct current.

[0003] The high-voltage DC contactors used in new energy vehicles are generally ceramic sealed high-voltage DC contactors, which have good arc extinguishing performance and strong electrical performance, but have complex manufacturing processes and high manufacturing costs. When faced with application conditions where the electrical performance requirements of the contactor are relatively weak, this type of product is not cost-effective.

[0004] Therefore, a DC contactor is urgently needed to solve the above problems. Summary of the invention

[0005] Based on the above, the purpose of the present invention is to provide a DC contactor, which is particularly suitable for scenarios with weaker requirements on electrical performance, can effectively reduce manufacturing processes and costs, and has a higher cost-effectiveness.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] DC contactor, including:

[0008] Drive unit and plastic housing;

[0009] A moving contact piece is disposed in the plastic housing, and the driving device is configured to drive the moving contact piece to approach or move away from the driving device;

[0010] Two connecting copper bars are provided, the connecting copper bars are provided with a first contact, the moving contact piece is provided with two second contacts, the second contacts can be selectively connected with the first contacts in a one-to-one correspondence; the connecting copper bars at least partially extend out of the plastic housing.

[0011] As a preferred solution of the DC contactor, the DC contactor comprises two connecting copper bars, and the connecting copper bars are assembled and connected to the plastic housing.

[0012] As a preferred solution of the DC contactor, the plastic shell includes a rectangular top wall and four side walls extending vertically from four sides of the top wall, the top wall of the plastic shell is provided with a first connecting hole, the connecting copper bar is provided with a second connecting hole corresponding to the first connecting hole, a first connecting member is penetrated through the first connecting hole and the second connecting hole to connect the connecting copper bar and the plastic shell, and the two opposite side walls of the plastic shell are correspondingly provided with through holes, and the connecting copper bar is partially inserted into the cavity of the plastic shell through the through holes so that the first contact and the second contact are in corresponding positions.

[0013] As a preferred solution of the DC contactor, the plastic shell is provided with a glue dispensing groove connected to the connecting copper busbar, two first connecting holes are arranged at intervals on one side of the top wall of the plastic shell, the glue dispensing groove is arranged between the two first connecting holes, the glue dispensing groove is used to accommodate adhesive, and the connecting copper busbar is bonded to the plastic shell.

[0014] As a preferred solution of the DC contactor, the DC contactor is also provided with a bottom cover, which is detachably connected to the plastic shell, and the driving device is arranged in the plastic shell. The DC contactor also includes pins electrically connected to the driving device, and the pins extend from the plastic shell to electrically connect the bottom cover to the docking electrical appliance.

[0015] As a preferred solution of the DC contactor, the plastic shell is provided with an avoidance hole, and the DC contactor is further provided with a dust cover, and the dust cover can selectively block the avoidance hole.

[0016] As a preferred solution of the DC contactor, the connecting copper busbar is integrally formed with the plastic housing by injection molding.

[0017] As a preferred solution of the DC contactor, the DC contactor also includes a yoke frame for accommodating the driving device, the driving device is arranged outside the plastic shell and the plastic shell is located on the upper surface of the yoke frame, and the plastic shell is detachably connected to the yoke frame.

[0018] As a preferred solution of the DC contactor, a sealing gasket is provided between the plastic housing and the yoke frame.

[0019] As a preferred solution of the DC contactor, the first contact is made of alloy material and is welded, bonded or riveted to the connecting copper busbar.

[0020] The beneficial effects of the present invention are:

[0021] The present invention sets a driving device and a moving contact piece so that the driving device can drive the moving contact piece to move in a direction close to or away from the driving device. During the movement of the moving contact piece, since the moving contact piece is provided with a second contact point, correspondingly, the connecting copper bar is provided with a first contact point. When the driving device drives the moving contact piece to move in a direction close to the driving device, the second contact point can be separated from the contact with the first contact point, and then the conduction between the moving contact piece and the connecting copper bar is disconnected, so as to realize the function of the DC contactor closing the circuit. At the same time, the moving contact piece is arranged in a plastic shell, which can not only protect the moving contact piece, but also take into account the electrical isolation function, so that the DC contactor can be applied to some scenes with weaker requirements for electrical performance. Compared with the ceramic structure, the plastic shell has a simpler manufacturing process and lower cost, which can effectively improve the economy of the DC contactor. In addition, by directly setting the first contact point on the connecting copper bar, and extending at least part of the connecting copper bar out of the plastic shell, the connecting copper bar can be directly used for the connection between the DC contactor and the external circuit, which effectively reduces the number of parts and simplifies the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 is a schematic diagram of a DC contactor provided in Embodiment 1 of the present invention from one viewing angle;

[0024] Figure 2 is a schematic diagram of the DC contactor provided in the first embodiment of the present invention from another perspective;

[0025] Figure 3 yes Figure 2 Schematic diagram of hidden dust cover;

[0026] Figure 4 Schematic diagram of a DC contactor with a hidden plastic housing and a bottom cover provided in Embodiment 1 of the present invention;

[0027] Figure 5 yes Figure 4 A partial enlarged schematic diagram in the middle;

[0028] Figure 6 is a schematic diagram of a DC contactor provided in Embodiment 2 of the present invention;

[0029] Figure 7 is a schematic diagram of a DC contactor with a hidden plastic housing provided in Embodiment 2 of the present invention;

[0030] Figure 8 Schematic diagram of an explosion of a DC contactor provided in Embodiment 2 of the present invention.

[0031] In the figure:

[0032] 100. Driving device;

[0033] 200, plastic housing; 201, first connecting hole; 202, avoidance hole; 2021, vertical portion; 2022, horizontal portion; 2023, snap-fit ​​member; 203, snap-fit ​​hole; 204, mounting ear; 210, first connecting member; 211, screw head; 212, screw rod; 220, glue dispensing groove; 230, nut; 240, second connecting member;

[0034] 300, moving contact piece; 310, second contact point;

[0035] 400, connecting copper busbar; 401, second connecting hole; 410, first contact point;

[0036] 510, bottom cover; 511, snap-fit ​​protrusion; 520, dust cover; 530, reset member; 540, bracket;

[0037] 600, pins;

[0038] 700, yoke iron frame; 710, fourth connecting hole;

[0039] 800. Sealing gasket. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0042] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0045] Embodiment 1

[0046] like Figure 1-Figure 5 As shown, this embodiment provides a DC contactor, which includes a driving device 100, a plastic housing 200, a moving contact piece 300 and a connecting copper bar 400. In this embodiment, two connecting copper bars 400 are provided; and the two connecting copper bars 400 are arranged on opposite sides of the plastic housing 200. The moving contact piece 300 is arranged in the plastic housing 200, and the driving device 100 is configured to drive the moving contact piece 300 to approach or move away from the driving device 100; the connecting copper bar 400 is provided with a first contact point 410, and the moving contact piece 300 is provided with two second contacts 310, and the second contacts 310 can be selectively connected with the first contacts 410 in a one-to-one correspondence. The plastic housing 200 is made of plastic material, and the connecting copper bar 400 at least partially extends out of the plastic housing 200.

[0047] By setting the driving device 100 and the moving contact piece 300, the driving device 100 can drive the moving contact piece 300 to move in a direction close to or away from the driving device 100. During the movement of the moving contact piece 300, since the moving contact piece 300 is provided with a second contact point 310, correspondingly, the connecting copper bus 400 is provided with a first contact point 410. When the driving device 100 drives the moving contact piece 300 to move in a direction close to the driving device 100, the second contact point 310 can be separated from the contact with the first contact point 410, and then the conduction between the moving contact piece 300 and the connecting copper bus 400 is disconnected, so as to realize the function of the DC contactor closing the circuit. At the same time, the moving contact piece 300 is arranged in the plastic shell 200, and the plastic shell 200 replaces the ceramic material in the prior art. The plastic shell 200 can not only protect the moving contact piece 300, but also take into account the electrical isolation effect, so that the DC contactor can be applied to some scenes with weak electrical performance requirements. Compared with the ceramic structure, the plastic shell 200 has a simpler manufacturing process and lower cost, which can effectively improve the economy of the DC contactor. In addition, by directly setting the first contact 410 on the connecting copper bus 400, and extending at least part of the connecting copper bus 400 out of the plastic shell 200, the connecting copper bus 400 can be directly used for the connection between the DC contactor and the external circuit, which effectively reduces the number of parts and simplifies the structure. The plastic shell 200 can be made of nylon, PET or PPT, which is not specifically limited here.

[0048] It is worth noting that the DC contactor also includes a push rod assembly (not shown) connecting the moving contact piece 300 and the driving device 100, which includes a bracket 540 and a reset member 530. The moving contact piece 300 crosses the bracket 540 and the two ends of the moving contact piece 300 are located at the two ends of the bracket 540. Two connecting copper bars 400 are respectively arranged at the two ends of the bracket 540 and are arranged corresponding to the moving contact piece 300. The reset member 530 is connected to the moving contact piece 300. When the driving device 100 does not drive the moving contact piece 300 to move, the reset member 530 can drive the moving contact to move in a direction away from the driving device 100, thereby causing the first contact 410 and the second contact 310 to be disconnected, so as to realize the function of the DC contactor conducting the circuit. Regarding the working principle and setting method of the driving device 100, those skilled in the art can set it according to actual needs, and no specific limitation is made here.

[0049] Specifically, to achieve the connection between the first contact 410 and the connecting copper bar 400, the first contact 410 is made of an alloy material and is welded, bonded or riveted to the connecting copper bar 400. The alloy material of the first contact 410 is preferably alloy silver. Similarly, the connection between the second contact 310 and the moving contact piece 300 can also be bonded or riveted. It can be understood that the first contact 410 and the connecting copper bar 400 after bonding or riveting, and the second contact 310 and the moving contact piece 300 are all conductive connections, that is, bonding can use conductive glue, and riveting also uses conductive materials.

[0050] In this embodiment, in order to realize the connection between the copper busbar 400 and the plastic housing 200, the copper busbar 400 and the plastic housing 200 are assembled and connected. That is, the copper busbar 400 and the plastic housing 200 are connected through an assembly process. Exemplarily, the assembly connection can be a detachable connection or a non-detachable connection, but both require an assembly process for connection.

[0051] Optionally, the plastic housing 200 includes a rectangular top wall and four side walls extending vertically from four sides of the top wall, the top wall of the plastic housing 200 is provided with a first connection hole 201, the connecting copper bar 400 is provided with a second connection hole 401 corresponding to the first connection hole 201, and the first connecting member 210 is penetrated through the first connection hole 201 and the second connection hole 401 to connect the copper bar 400 and the plastic housing 200, so that the plastic housing 200 and the connecting copper bar 400 can be fixed. Through the connection of the first connecting member 210, the connection between the connecting copper bar 400 and the plastic housing 200 is more reliable. The opposite side walls of the plastic housing 200 are also correspondingly provided with through holes, and the connecting copper bar 400 is partially inserted into the cavity of the plastic housing 200 through the through holes so that the first contact 410 and the second contact 310 are in corresponding positions.

[0052] Specifically, a nut 230 may be provided in the first connection hole 201 and / or the second connection hole 401, and the nut 230 may be integrally formed in the first connection hole 201 and / or the second connection hole 401 by injection molding; or one of the first connection hole 201 and / or the second connection hole 401 is provided as a threaded hole. Accordingly, the first connection member 210 is a bolt, and the threaded connection is more reliable, and the disassembly is more convenient. Preferably, a connection between a copper bar 400 and a plastic housing 200 may be realized by two first connection members 210, so that the connection is more secure. In the present application, the first connection member 210 is a bolt, and the first connection member 210 includes a screw head 211 and a screw rod 212 connected to the screw head 211, the screw head 211 is accommodated in the first connection hole 201, and the screw rod 212 is accommodated in the second connection hole 401.

[0053] Further optionally, the plastic housing 200 is provided with a glue dispensing groove 220 connected to the connecting copper bar 400, and the glue dispensing groove 220 is used to accommodate adhesive, and the adhesive has the function of sealing and increasing the fixation between the connecting copper bar 400 and the plastic housing 200, that is, the connection between the connecting copper bar 400 and the plastic housing 200 is further increased by bonding, which is beneficial to improving the sealing of the DC contactor while improving the connection firmness. In this embodiment, two first connecting holes 201 are arranged at intervals on one side of the top wall of the plastic housing 200, and the glue dispensing grooves 220 are arranged at intervals on both sides of the first connecting hole 201.

[0054] It is worth noting that in order to ensure the reliability and sealing of the connection between the connecting copper bus 400 and the plastic shell 200, the connecting copper bus 400 can be first connected to the plastic shell 200 by means of a first connecting piece 210, and then further reinforced and sealed by means of glue dispenser 220, so that the structure of the connected DC contactor is more solid and the performance is more reliable.

[0055] Preferably, the plastic housing 200 is provided with an avoidance hole 202, and the avoidance hole 202 is provided to avoid the first contact 410 when installing the copper busbar 400. Correspondingly, the DC contactor is also provided with a dust cover 520, and the dust cover 520 can block the avoidance hole 202 when the copper busbar 400 is installed, thereby ensuring the dustproofness and sealing of the plastic housing 200, and further ensuring the stability of the performance of the DC contactor. The avoidance hole 202 is T-shaped, including a vertical portion 2021 vertically arranged with the copper busbar 400 and a horizontal portion 2022 vertical with the vertical portion 2021, and a protruding snap-fitting part 2023 is provided in the vertical portion 2021, and the dust cover 520 is matched with the avoidance hole 202. When the dust cover 520 is installed in the avoidance hole 202, it cooperates with the snap-fitting part 2023 and is fixed in the avoidance hole 202.

[0056] In this embodiment, the driving device 100 is arranged in the plastic shell 200. Accordingly, the DC contactor is also provided with a bottom cover 510, and the bottom cover 510 is detachably connected to the plastic shell 200. When the bottom cover 510 and the plastic shell 200 are disassembled, they can be used to install the driving device 100. After the installation of the driving device 100 is completed, by connecting the bottom cover 510 and the plastic shell 200, a certain protection and isolation effect can be played on the driving device 100.

[0057] Specifically, the side wall of the plastic housing 200 is provided with a snap-in hole 203. Correspondingly, the bottom cover 510 is provided with snap-in protrusions 511 corresponding to the snap-in holes 203 around it. When the snap-in protrusions 511 are placed in the snap-in holes 203, the bottom cover 510 and the plastic housing 200 can be connected, and the connection is more reliable and the disassembly is more convenient.

[0058] Furthermore, the DC contactor also includes a pin 600 electrically connected to the driving device 100 . The pin 600 extends out of the bottom cover 510 from the plastic housing 200 and is used for electrically connecting to a docking electrical appliance.

[0059] Embodiment 2

[0060] In this embodiment, Figure 6-Figure 8 As shown, in order to realize the connection between the copper busbar 400 and the plastic housing 200, the copper busbar 400 and the plastic housing 200 are integrally formed. The copper busbar 400 and the plastic housing 200 are connected by integral forming, which is conducive to reducing assembly steps, improving integration and connection reliability. Optionally, the integral forming can be integral injection molding.

[0061] Specifically, the DC contactor also includes a yoke frame 700 that accommodates a drive device 100, and the drive device 100 is arranged outside the plastic shell 200. By arranging the drive device 100 outside the plastic shell 200 and the plastic shell 200 is located on the upper surface of the yoke frame 700, it is beneficial to reduce the volume of the plastic shell 200, and at the same time simplify the structure of the plastic shell 200, thereby reducing the difficulty of one-piece molding.

[0062] Furthermore, the plastic housing 200 and the yoke frame 700 are detachably connected, so as to facilitate the inspection and replacement of the plastic housing 200 or the yoke frame 700 .

[0063] Optionally, the plastic housing 200 is provided with a mounting ear 204, the mounting ear 204 is provided with a third connecting hole, the yoke frame 700 is provided with a fourth connecting hole 710, and the second connecting member 240 is passed through the third connecting hole and the fourth connecting hole 710 for connecting the plastic housing 200 and the yoke frame 700. In this embodiment, four third connecting holes are provided around the plastic housing 200, and correspondingly, four fourth connecting holes 710 are also provided and are set as threaded holes, and the second connecting member 240 is a bolt, and the second connecting member 240 can be passed through the third connecting hole and the fourth connecting hole 710 for threaded connection.

[0064] Preferably, if Figure 8 As shown, a sealing gasket 800 is further provided between the plastic housing 200 and the yoke frame 700. The provision of the sealing gasket 800 is conducive to improving the sealing between the plastic housing 200 and the yoke frame 700. Exemplarily, a fifth connecting hole 810 is provided on the sealing gasket 800, and the second connecting member 240 is penetrated through the fifth connecting hole 810 to achieve the connection and sealing between the sealing gasket 800 and the plastic housing 200 and the yoke frame 700, so that the connection is more reliable and the sealing effect is better.

[0065] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A DC contactor, characterized in that: include: A driving device (100) and a plastic housing (200); A movable contact piece (300) is disposed in the plastic housing (200), and the driving device (100) is configured to be able to drive the movable contact piece (300) to move closer to or farther away from the driving device (100); A connecting copper busbar (400) is provided with a first contact point (410), and the movable contact piece (300) is provided with a second contact point (310), and the second contact point (310) can be selectively connected to the first contact point (410) in a one-to-one correspondence; the connecting copper busbar (400) at least partially extends out of the plastic housing (200).

2. The DC contactor according to claim 1, characterized in that: The DC contactor comprises two connecting copper bars (400), and the connecting copper bars (400) are assembled and connected to the plastic housing (200).

3. The DC contactor according to claim 2, characterized in that: The plastic shell (200) comprises a rectangular top wall and four side walls extending vertically from four sides of the top wall; the top wall of the plastic shell (200) is provided with a first connection hole (201); the connection copper busbar (400) is provided with a second connection hole (401) corresponding to the first connection hole (201); a first connection member (210) is inserted through the first connection hole (201) and the second connection hole (401) to connect the connection copper busbar (400) and the plastic shell (200); two opposite side walls of the plastic shell (200) are correspondingly provided with through holes; the connection copper busbar (400) is partially inserted into the cavity of the plastic shell (200) through the through holes so that the first contact point (410) and the second contact point (310) are in corresponding positions.

4. The DC contactor according to claim 2, characterized in that: The plastic shell (200) is provided with a glue dispensing groove (220) connected to the connecting copper busbar (400); two first connecting holes (201) are arranged at intervals on one side of the top wall of the plastic shell (200); the glue dispensing groove (220) is provided on both sides of the first connecting hole (201); the glue dispensing groove (220) is used to accommodate adhesive; the connecting copper busbar (400) is bonded to the plastic shell (200).

5. The DC contactor according to claim 1, characterized in that: The DC contactor is also provided with a bottom cover (510), the bottom cover (510) is detachably connected to the plastic shell (200), the driving device (100) is arranged in the plastic shell (200), and the DC contactor also includes a pin (600) electrically connected to the driving device (100), and the pin (600) extends from the plastic shell (200) to the bottom cover (510) and is electrically connected to the docking electrical appliance.

6. The DC contactor according to claim 1, characterized in that: The plastic housing (200) is provided with an avoidance hole (202), and the DC contactor is further provided with a dust cover (520), and the dust cover (520) can selectively block the avoidance hole (202).

7. The DC contactor according to claim 1, characterized in that: The connecting copper bar (400) is integrally formed with the plastic housing (200) by injection molding.

8. The DC contactor according to claim 1, characterized in that: The DC contactor further comprises a yoke frame (700) for accommodating the drive device (100); the drive device (100) is arranged outside the plastic shell (200) and the plastic shell (200) is located on the upper surface of the yoke frame (700); the plastic shell (200) and the yoke frame (700) are detachably connected.

9. The DC contactor according to claim 8, characterized in that: A sealing gasket (800) is provided between the plastic housing (200) and the yoke frame (700).

10. The DC contactor according to any one of claims 1 to 9, characterized in that: The first contact (410) is made of alloy material and is welded, bonded or riveted to the connecting copper bar (400).

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