Connecting mechanism for auxiliary contact of direct current contactor and direct current contactor

Abstract

The utility model discloses a connecting mechanism for an auxiliary contact of a direct current contactor and the direct current contactor, and relates to the technical field of electrical equipment. The connecting mechanism for the auxiliary contact of the direct current contactor comprises a coil framework and a metal insertion piece, the coil framework and the metal insertion piece are of an integrated injection molding structure, the coil framework is used for installing a coil, and the metal insertion piece is used for being connected with the auxiliary contact of the direct current contactor. According to the connecting mechanism for the auxiliary contact of the direct-current contactor and the direct-current contactor, the auxiliary contact is led out of the shell of the high-voltage direct-current contactor through the metal insertion piece, the process operability is high, and the problem that the welding position of the auxiliary contact and a wire is prone to breakage in a welding wire leading-out mode in the prior art can be solved; therefore, the working reliability of the high-voltage direct-current contactor is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a connection mechanism for auxiliary contacts of a DC contactor and a DC contactor. Background Art

[0002] A DC contactor is a contactor whose core is controlled by a DC coil. Because DC flows through the attraction coil, there's no inrush starting current, making it suitable for applications with frequent starts and stops. A DC contactor generally consists of a coil and external magnetic circuit, an arc extinguishing chamber, a stationary contact, a moving contact, a movable shaft assembly, a permanent magnet, and a plastic casing. With the widespread adoption of DC power supply systems in electric vehicles, aviation, rail transit, charging stations, photovoltaics, and energy storage, the use of DC contactors is increasing rapidly.

[0003] In existing technology, auxiliary contacts are welded to the exterior of the high-voltage direct current contactor housing via wires. These wires are then connected to the battery management system, providing feedback on the operating status of the high-voltage DC contactor's main contacts. Due to the inherent characteristics of the wires, securing them is difficult, resulting in poor process operability and a high risk of fracture at the weld between the auxiliary contacts and the wires, leading to the risk of failure of the high-voltage DC contactor. Utility Model Content

[0004] The purpose of the utility model is to provide a connection mechanism for auxiliary contacts of a DC contactor and a DC contactor, wherein the auxiliary contacts are led out of the high-voltage DC contactor housing through metal inserts, the process operability is strong, and the problem of easy breakage of the welding joint between the auxiliary contacts and the wires in the prior art of the welding wire lead-out method can be solved, thereby ensuring the reliability of the high-voltage DC contactor.

[0005] The embodiment of the present utility model is achieved as follows:

[0006] In a first aspect, embodiments of the present invention provide a connection mechanism for auxiliary contacts of a DC contactor, comprising a coil bobbin and a metal insert. The coil bobbin and the metal insert are integrally injection-molded. The coil bobbin is used to mount the coil, and the metal insert is used to connect to the auxiliary contacts of the DC contactor. This connection mechanism for auxiliary contacts of a DC contactor uses the metal insert to lead the auxiliary contacts out of the high-voltage DC contactor housing. This process is highly operational and addresses the problem of easily breaking the weld between the auxiliary contacts and the wires, a problem encountered in conventional wire lead-out methods. This ensures the reliability of the high-voltage DC contactor.

[0007] As an implementation method, it further includes a wire, and the metal insert is connected to the auxiliary contact through the wire.

[0008] As an implementation method, the metal insert includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion is used to connect to the wire, and the second connecting portion is used to connect to the circuit board of the DC contactor, and the first connecting portion and the second connecting portion are located on different sides of the coil skeleton.

[0009] As an implementation method, the coil skeleton extends toward the side close to the auxiliary contact to form a mounting seat, the end of the first connection part close to the second connection part is arranged in the mounting seat, and the end of the first connection part away from the second connection part extends out of the mounting seat.

[0010] As an implementable embodiment, the number of the metal inserts is the same as the number of the auxiliary contacts, and the metal inserts and the auxiliary contacts are arranged in a one-to-one correspondence.

[0011] As an implementation method, it further includes a first pin, wherein the first pin and the second connecting portion are respectively arranged on opposite sides of the coil frame, one end of the first pin is embedded in the coil frame, and the other end of the first pin is connected to the circuit board.

[0012] As an implementation method, it further includes a connector, which is connected to the circuit board and is used to connect the DC contactor to the power circuit.

[0013] As an implementation method, it further includes a second pin, and the connector and the second pin are an integral injection-molded structure, and the connector connects the DC contactor to the power circuit through the second pin.

[0014] A second aspect of the present invention provides a DC contactor, comprising an auxiliary contact and the aforementioned connecting mechanism for the auxiliary contact, wherein the metal insert of the connecting mechanism is connected to the auxiliary contact. This connecting mechanism for the auxiliary contact of the DC contactor uses the metal insert to lead the auxiliary contact to the exterior of the high-voltage DC contactor housing. This process is highly operable and addresses the problem of easily breaking the weld between the auxiliary contact and the wire, a problem that exists in conventional wire lead-out methods. This ensures the reliability of the high-voltage DC contactor.

[0015] As an implementable embodiment, the coil skeleton of the connecting mechanism extends toward the side close to the auxiliary contact to form a mounting seat, and the DC contactor also includes a yoke plate, and a avoidance groove is provided on the yoke plate. The shape of the avoidance groove is adapted to the shape of the mounting seat, and the avoidance groove is used to make way for the mounting seat.

[0016] The beneficial effects of the embodiments of the present utility model include:

[0017] The connecting mechanism includes a coil bobbin and a metal insert. The coil bobbin and the metal insert are an integral injection-molded structure. The coil bobbin is used to mount the coil, and the metal insert is used to connect to the auxiliary contact of the DC contactor. Compared with the prior art in which the auxiliary contact is led out of the high-voltage direct contactor housing by welding a wire, the connecting mechanism provided by the present application, on the basis of utilizing the coil bobbin of the DC contactor itself, directly replaces the existing wire or fixes the existing wire by adding a metal insert, thereby preventing the wire from shaking significantly, making the wire fixation more secure, and thus ensuring the reliability of the high-voltage DC contactor. In the actual production process, the coil bobbin and the metal insert can be first formed into a whole by an injection molding process, and then the whole formed by the coil bobbin and the metal insert is assembled and fixed. The manufacture of the coil bobbin and the metal insert can be completed by only one set of molds, without adding a set of molds specifically for manufacturing the metal insert, and without fixing the separately manufactured coil bobbins and metal inserts, thereby improving the operability and simplicity of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 One of the structural schematic diagrams of the connection mechanism for auxiliary contacts of a DC contactor provided in an embodiment of the utility model;

[0020] Figure 2 This is a second structural diagram of a connection mechanism for auxiliary contacts of a DC contactor provided in an embodiment of the present utility model.

[0021] Icon: 100-connecting mechanism; 10-coil skeleton; 11-mounting seat; 20-metal insert; 21-first connecting part; 22-second connecting part; 30-wire; 40-yoke plate; 41-avoidance groove; 50-first pin; 60-connector; 70-second pin; 200-DC contactor; 210-auxiliary contact; 220-coil; 230-circuit board. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0027] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections, indirect connections through an intermediate medium, or connections within two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] Please refer to Figure 1 and Figure 2 The present invention provides a connection mechanism 100 (hereinafter referred to as the connection mechanism 100 ) for the auxiliary contact 210 of a DC contactor 200 . The connection mechanism 100 includes a coil bobbin 10 and a metal insert 20 . The coil bobbin 10 and the metal insert 20 are integrally injection-molded. The coil bobbin 10 is used to mount the coil 220 , and the metal insert 20 is used to connect to the auxiliary contact 210 of the DC contactor 200 . The connection mechanism 100 for the auxiliary contact 210 of the DC contactor 200 uses the metal insert 20 to lead the auxiliary contact 210 outside the housing of the high-voltage DC contactor 200 . This connection mechanism 100 has high process operability and can solve the problem of the prior art of welding the wire 30 to lead out, which is prone to breakage at the weld between the auxiliary contact 210 and the wire 30 , thereby ensuring the reliability of the high-voltage DC contactor 200 .

[0029] It should be noted that the connection mechanism 100 includes a coil bobbin 10 and a metal insert 20. The coil bobbin 10 is used to mount the coil 220, and the metal insert 20 is used to connect to the auxiliary contact 210 of the DC contactor 200. Furthermore, the coil bobbin 10 and the metal insert 20 are integrally injection-molded. In other words, in actual manufacturing, the coil bobbin 10 and the metal insert 20 can first be formed into a single unit using an injection molding process, and then the unit formed by the coil bobbin 10 and the metal insert 20 can be assembled and fixed. For example, the starting coil 220 and the holding coil 220 can be sequentially sleeved on the coil bobbin 10 from the inside out, and the metal insert 20 can be electrically connected to the auxiliary contact 210.

[0030] The advantage of this is that, on the one hand, by adding a metal insert 20, the wire 30 in the prior art can be directly replaced for connection with the auxiliary contact 210, and the metal insert 20 can also be used to fix the existing wire, thereby avoiding large-scale shaking of the wire 30 and making the wire 30 more securely fixed. On the other hand, during production, only one set of molds is needed to complete the manufacture of the coil skeleton 10 and the metal insert 20. There is no need to add a set of molds specifically for manufacturing the metal insert 20, nor is there any need to fix the separately manufactured coil skeleton 10 and metal insert 20, thereby improving the operability and simplicity of the production process.

[0031] In summary, compared with the prior art in which the auxiliary contact 210 is led out of the high-voltage direct contactor housing by welding the wire 30, Figure 1 and Figure 2As shown, the connection mechanism 100 provided in the present application, on the basis of utilizing the coil skeleton 10 of the DC contactor 200 itself, further adds a metal insert 20 to directly replace the existing wire or fix the existing wire, thereby avoiding the wire 30 from shaking significantly, making the wire 30 more firmly fixed, and thus ensuring the reliability of the high-voltage DC contactor 200. In the actual production process, the injection molding process can be used to first form the coil skeleton 10 and the metal insert 20 into a whole, and then the whole formed by the coil skeleton 10 and the metal insert 20 is assembled and fixed. The manufacture of the coil skeleton 10 and the metal insert 20 can be completed by only one set of molds. There is no need to add a set of molds specifically for manufacturing the metal insert 20, nor is there any need to fix the separately manufactured coil skeleton 10 and metal insert 20, which improves the operability and simplicity of the production process.

[0032] As an implementable method, Figure 2 As shown, the connection mechanism 100 also includes a wire 30, and the metal insert 20 is connected to the auxiliary contact 210 via the wire 30. In other words, the connection mechanism 100 provided in the present application divides the lead-out path originally connected via the wire 30 in the prior art into at least two parts, one part of which is connected via the metal insert 20, and the remaining part is connected via the wire 30, thereby shortening the actual length of the required wire 30 and fixing the remaining part of the wire 30 via the metal insert 20. This method can not only maximize the advantages of the good connection stability of the metal insert 20 and the high shape adaptability of the wire 30, but also make the wire 30 more securely fixed via the metal insert 20.

[0033] As an implementable method, Figure 1 and Figure 2 As shown, the metal insert 20 includes a first connecting portion 21 and a second connecting portion 22 that are interconnected. The first connecting portion 21 is used to connect to the wire 30, and the second connecting portion 22 is used to connect to the circuit board 230 of the DC contactor 200, so as to further guide the auxiliary signal of the auxiliary contact 210 to the circuit board 230 through the metal insert 20. The first connecting portion 21 and the second connecting portion 22 are located on different sides of the coil skeleton 10 to better adapt to the respective orientation layouts of the main contacts, circuit board 230 and coil skeleton 10 inside the DC contactor 200.

[0034] As an implementable method, Figure 1 and Figure 2As shown, the coil skeleton 10 extends toward the side close to the auxiliary contact 210 to form a mounting seat 11, and the end of the first connecting portion 21 close to the second connecting portion 22 is arranged in the mounting seat 11 to fix the metal insert 20 through the mounting seat 11, thereby improving the reliability of the fixation of the metal insert 20, and the end of the first connecting portion 21 away from the second connecting portion 22 extends out of the mounting seat 11, so that the wire 30 can be fixed at the end of the first connecting portion 21 away from the second connecting portion 22, so that the wire 30 is electrically connected to the metal insert 20.

[0035] As an implementable method, Figure 2 As shown, the number of metal inserts 20 is the same as the number of auxiliary contacts 210, and the metal inserts 20 and the auxiliary contacts 210 are arranged in a one-to-one correspondence. For example, the number of metal inserts 20 and the number of auxiliary contacts 210 are both two, and two metal inserts 20 and two auxiliary contacts 210 are arranged in a one-to-one correspondence.

[0036] As an implementable method, Figure 1 and Figure 2 As shown, the connecting mechanism 100 also includes a first pin 50, and the cross-section of the coil skeleton 10 is in the shape of an I. The first pin 50 and the second connecting portion 22 are respectively arranged on opposite sides of the coil skeleton 10 (i.e., the upper bottom side and the lower bottom side of the I). One end of the first pin 50 is embedded in the coil skeleton 10, and the other end of the first pin 50 is connected to the circuit board 230 so that the coil 220 is located in the electric field.

[0037] As an implementable method, Figure 2 As shown, the connection mechanism 100 also includes a connector 60, which is arranged outside the housing of the DC contactor 200. The connector 60 is connected to the circuit board 230, and the connector 60 is used to connect the DC contactor 200 to the power circuit (such as the battery management system). Furthermore, as an embodiment, the connection mechanism 100 also includes a second pin 70. The connector 60 and the second pin 70 are an integral injection-molded structure. The connector 60 connects the DC contactor 200 to the power circuit through the second pin 70. Similar to the integral injection-molded structure of the coil skeleton 10 and the metal insert 20, the connector 60 and the second pin 70 are an integral injection-molded structure, which can improve the connection reliability of the connector 60 and the second pin 70 and the ease of manufacturing.

[0038] like Figure 2As shown, the embodiment of the present application further provides a DC contactor 200, comprising an auxiliary contact 210 and the aforementioned connecting mechanism 100 for the auxiliary contact 210 of the DC contactor 200, wherein the metal insert 20 of the connecting mechanism 100 is connected to the auxiliary contact 210. Since the structure and beneficial effects of the connecting mechanism 100 for the auxiliary contact 210 of the DC contactor 200 have been described in detail in the aforementioned embodiment, they will not be repeated here.

[0039] As an implementable method, Figure 2 As shown, the DC contactor 200 also includes a yoke plate 40. When the coil skeleton 10 of the connecting mechanism 100 extends toward the side close to the auxiliary contact 210 to form a mounting seat 11, since the yoke plate 40 is arranged above the coil skeleton 10, an avoidance groove 41 is provided on the yoke plate 40. The shape of the avoidance groove 41 is adapted to the shape of the mounting seat 11 so that the mounting seat 11 is given way by the avoidance groove 41, thereby avoiding interference between the yoke plate 40 and the mounting seat 11 of the coil skeleton 10 during assembly.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A connection mechanism for auxiliary contacts of a DC contactor, characterized in that: The invention comprises a coil frame (10) and a metal insert (20), wherein the coil frame (10) and the metal insert (20) are an integral injection-molded structure, the coil frame (10) is used for mounting a coil (220), and the metal insert (20) is used for connecting to an auxiliary contact (210) of a DC contactor (200).

2. The connection mechanism for auxiliary contacts of a DC contactor according to claim 1, characterized in that: It also includes a wire (30), and the metal insert (20) is connected to the auxiliary contact (210) through the wire (30).

3. The connection mechanism for auxiliary contacts of a DC contactor according to claim 2, characterized in that: The metal insert (20) comprises a first connecting portion (21) and a second connecting portion (22) connected to each other, the first connecting portion (21) being used to connect to the wire (30), the second connecting portion (22) being used to connect to a circuit board (230) of a DC contactor (200), and the first connecting portion (21) and the second connecting portion (22) being located on different sides of the coil skeleton (10).

4. The connection mechanism for auxiliary contacts of a DC contactor according to claim 3, characterized in that: The coil skeleton (10) extends toward a side close to the auxiliary contact (210) to form a mounting seat (11); an end of the first connecting portion (21) close to the second connecting portion (22) is arranged in the mounting seat (11); and an end of the first connecting portion (21) away from the second connecting portion (22) extends out of the mounting seat (11).

5. The connection mechanism for auxiliary contacts of a DC contactor according to any one of claims 1 to 4, characterized in that: The number of the metal inserts (20) is the same as the number of the auxiliary contacts (210), and the metal inserts (20) and the auxiliary contacts (210) are arranged in a one-to-one correspondence.

6. The connection mechanism for auxiliary contacts of a DC contactor according to claim 3, characterized in that: The invention also includes a first plug pin (50), wherein the first plug pin (50) and the second connecting portion (22) are respectively arranged on opposite sides of the coil skeleton (10), one end of the first plug pin (50) is embedded in the coil skeleton (10), and the other end of the first plug pin (50) is connected to the circuit board (230).

7. The connection mechanism for auxiliary contacts of a DC contactor according to claim 6, characterized in that: It also includes a connector (60), which is connected to the circuit board (230). The connector (60) is used to connect the DC contactor (200) to the power circuit.

8. The connection mechanism for auxiliary contacts of a DC contactor according to claim 7, characterized in that: It also includes a second plug pin (70), the connector (60) and the second plug pin (70) are an integral injection-molded structure, and the connector (60) connects the DC contactor (200) to the power circuit via the second plug pin (70).

9. A DC contactor, characterized in that: The invention comprises an auxiliary contact (210) and a connecting mechanism (100) for the auxiliary contact (210) of a DC contactor (200) as claimed in any one of claims 1 to 8, wherein a metal insert (20) of the connecting mechanism (100) is connected to the auxiliary contact (210).

10. The DC contactor according to claim 9, characterized in that: The coil skeleton (10) of the connecting mechanism (100) extends toward a side close to the auxiliary contact (210) to form a mounting seat (11). The DC contactor (200) further comprises a yoke plate (40). A relief groove (41) is provided on the yoke plate (40). The shape of the relief groove (41) is adapted to the shape of the mounting seat (11). The relief groove (41) is used to make way for the mounting seat (11).

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