contactor

Abstract

The contactor comprises a core, a coil, and an electronic circuit board connected with the coil, and the electronic circuit board is provided with a grounding end which is electrically connected with the core through a connecting structure. Without adding other special parts or structures, the grounding end of the electronic circuit board is connected with the core by utilizing the characteristics of the core, i.e. the electric conductivity and large volume, so that the core can not only drive the contactor to open and close, but also serve as the grounding end of the electronic circuit board. The contactor can not only quickly reduce and eliminate the interference from the outside world and reduce the electrical impact on the electronic circuit board, but also facilitate the optimization of the parameters of the electronic components such as capacitors and inductors on the electronic circuit board, improve the power factor of the electronic circuit board, and has the characteristics of low cost and high performance.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and in particular to a contactor. Background Technology

[0002] Contactors are widely used in the field of electronic power equipment, especially electronic contactors. Electronic contactors typically contain an electronic circuit board composed of electronic components such as resistors, capacitors, and inductors, which implements control and protection functions. However, the coil of an electronic contactor generates significant interference when energized, easily causing interference to nearby components. Therefore, it is necessary to reduce this interference to within standard requirements. Due to space limitations, the ground terminal area in the electronic circuit board is relatively small. Existing technology can reduce interference by increasing the capacitance of the absorption capacitor and inductor on the electronic circuit board, but this results in high coil power consumption and a low power factor. The significant power consumption at the capacitors and inductors not only increases the size of the electronic circuit board but also raises costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a contactor with a simple structure and high reliability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A contactor includes an iron core and a coil, and an electronic circuit board connected to the coil. The electronic circuit board has a ground terminal, which is electrically connected to the iron core via a connection structure, thereby increasing the area and volume of the ground terminal of the electronic circuit board.

[0006] Preferably, the iron core is a magnetic yoke or an armature, and the grounding terminal of the electronic circuit board is connected to the magnetic yoke or armature through the connection structure.

[0007] Preferably, the connection structure includes a first connection structure and a second connection structure that are separately configured. One end of the first connection structure is electrically connected to the ground terminal of the electronic circuit board, and one end of the second connection structure is electrically connected to the iron core. The other ends of the first connection structure and the second connection structure are detachably connected. The second connection structure includes a fixing member for fixing the iron core.

[0008] Preferably, the second connection structure includes a fastening screw for fixing the iron core to the base plate, the fastening screw being electrically connected to the iron core, and the first connection structure being electrically connected to the fastening screw.

[0009] Preferably, the first connection structure includes a grounding wire connected to the grounding terminal of the electronic circuit board, and a grounding component connected to the grounding wire. The grounding component is provided with a wiring hole. After the wiring hole is fitted onto the fastening screw, the fastening screw is connected to the fastening nut, thereby limiting the grounding component on the fastening screw.

[0010] Preferably, the second connection structure further includes a conductive clamp connected to the fastening screw, the conductive clamp pushing the iron core to press against the base plate, and the conductive clamp being electrically connected to the fastening screw and the iron core respectively.

[0011] Preferably, the second connection structure further includes a conductive leaf spring, which is electrically connected to the fastening screw and the iron core respectively.

[0012] Preferably, a baffle is provided between the base plate and the head of the fastening screw, and the head of the fastening screw pushes the baffle to press against the base plate.

[0013] Preferably, the iron core has a boss on its side, and a conductive clamp pushes the boss to press it against the base plate, with a buffer between the boss and the base plate.

[0014] Preferably, the conductive leaf spring includes a limiting part and a pressing part connected together. The limiting part is located between the base plate and the conductive clamp and is in contact with the conductive clamp. The pressing part is provided with at least one arc surface, which is pressed against the iron core and electrically connected to the iron core.

[0015] Preferably, the grounding wire includes at least a first conductor and a second conductor, one end of the first conductor and the second conductor are respectively connected to the grounding component and the grounding terminal of the electronic circuit board, and the other end of the first conductor and the other end of the second conductor are detachably connected.

[0016] The contactor invented in this invention does not require additional special parts or structures. Utilizing the conductivity and large size of the iron core, the grounding terminal of the electronic circuit board is connected to the iron core, thereby increasing the area and volume of the electronic circuit board's ground terminal. This significantly optimizes the EMC performance of the circuit board. In addition to driving the contactor's opening and closing, the iron core can also serve as the circuit board's ground terminal. This not only rapidly reduces and eliminates interference from the electronic circuit board to the outside world and reduces electrical shocks to the electronic circuit board, but also facilitates the optimization of parameters for electronic components such as capacitors and inductors on the electronic circuit board, improving the power factor of the electronic circuit board. It features low cost and high performance.

[0017] Furthermore, by designing the connection structure as a separate first connection structure and second connection structure, the electronic circuit board and the iron core can be assembled separately, and then the first connection structure and the second connection structure can be connected together. This not only reduces the difficulty of assembly, but also facilitates the individual disassembly or replacement of the electronic circuit board and the coil.

[0018] In addition, the fastening screw has two functions: it not only fixes the magnetic yoke and the base plate, but also forms an electrical connection. This eliminates the need for additional parts for electrical connection, saving on the number of parts and cost.

[0019] In addition, the grounding electrical connection is achieved through conductive leaf springs. The conductive leaf spring is an elastic connector with one or more arc surfaces. Combined with the function of elastic buffers, the grounding scheme can remain reliable under various harsh environmental conditions (such as strong impact, vibration, salt spray, alternating damp heat, mechanical and electrical life, etc.). Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the interaction between the magnetic yoke and the coil created in this invention;

[0021] Figure 2 This is a schematic diagram of the structure of the magnetic yoke created in this invention;

[0022] Figure 3 This is a schematic diagram of the structure of the coil created in this invention;

[0023] Figure 4 This is the first embodiment of the first connection structure created by the present invention;

[0024] Figure 5 This is the first embodiment of the second connection structure created by the present invention;

[0025] Figure 6 This invention is a creation Figure 5 Cross-sectional view;

[0026] Figure 7 This invention is a creation Figure 6 A magnified view of a portion of the image;

[0027] Figure 8 This is a schematic diagram of the structure of the magnetic yoke created in this invention;

[0028] Figure 9 This is a schematic diagram of the structure of the conductive leaf spring created in this invention;

[0029] Figure 10 This is a second embodiment of the second connection structure created by the present invention;

[0030] Figure 11 This invention is a creation Figure 10 A magnified view of a portion of the image;

[0031] Figure 12 This is a third embodiment of the second connection structure created by the present invention;

[0032] Figure 13 This invention is a creation Figure 12 A magnified view of a portion of the image;

[0033] Figure 14 This is a second embodiment of the first connection structure created by the present invention;

[0034] Figure 15 This is the third embodiment of the first connection structure created by the present invention.

[0035] Figure 16 This is a schematic diagram illustrating the engagement of the armature and the yoke in this invention;

[0036] Figure 17 This is a schematic diagram illustrating the support and cooperation between the armature and the contact in this invention;

[0037] Figure 18 This is a schematic diagram of the armature structure created in this invention. Detailed Implementation

[0038] The following is in conjunction with the appendix Figures 1 to 18 The given embodiments further illustrate specific implementations of the contactor created by the present invention. The contactor created by the present invention is not limited to the descriptions of the following embodiments.

[0039] like Figure 1 As shown, the contactor created by the present invention includes a magnetic yoke 11 and a coil 2, as well as an electronic circuit board 3 connected to the coil 2. The electronic circuit board 3 is provided with a grounding terminal, which is electrically connected to the magnetic yoke 11 through a connection structure.

[0040] The contactor invented in this invention does not require additional special parts or structures. Utilizing the conductivity and large size of the iron core, the grounding terminal of the electronic circuit board is connected to the iron core, thereby increasing the area and volume of the electronic circuit board's ground terminal. This significantly optimizes the EMC performance of the circuit board. In addition to driving the contactor's opening and closing, the iron core can also serve as the circuit board's ground terminal. This not only rapidly reduces and eliminates interference from the electronic circuit board to the outside world and reduces electrical shocks to the electronic circuit board, but also facilitates the optimization of parameters for electronic components such as capacitors and inductors on the electronic circuit board, improving the power factor of the electronic circuit board. It features low cost and high performance.

[0041] like Figure 16-18 As shown, the contactor typically includes a pair of iron cores, where the upper iron core is the moving iron core, also known as the armature 13, and the lower iron core is the stationary iron core, also known as the magnetic yoke 11. The coil 2 is mounted on the magnetic yoke 11, and the armature 13 is fastened to the contact support 14 by sliders 17 on both sides and cross pins 16. When the coil 2 is energized, an electromagnetic attraction is generated between the armature 13 and the magnetic yoke 11, driving the armature 13 to move the contact support 14 and the contact bridge 15 downwards until the armature 13 contacts the magnetic yoke 11, at which point the movement stops.

[0042] Now Figure 1-8The preferred embodiment shown is described below. In this embodiment, the iron core is a magnetic yoke 11. The grounding terminal of the electronic circuit board 3 is connected to the magnetic yoke 11, making the magnetic yoke 11 the ground terminal of the electronic circuit board 3. It can be understood that, as other embodiments of the present invention, the grounding terminal of the electronic circuit board 3 can also be connected to the armature 13 (moving iron core), making the armature 13 the ground terminal of the electronic circuit board 3. All of these fall within the protection scope of the present invention. In this embodiment, the iron core is considered the final ground terminal of the circuit. The iron core is not grounded in any other way. Because the iron core is a metal part and has a certain volume, its volume is much larger than that of the ground terminal of the circuit board. By enlarging the area and volume of the ground terminal in the electronic circuit board, the purpose of quickly eliminating or greatly reducing interference can be achieved.

[0043] Furthermore, the connection structure in this embodiment includes a separate first connection structure and a second connection structure. One end of the first connection structure is electrically connected to the ground terminal of the electronic circuit board 3, and one end of the second connection structure is electrically connected to the magnetic yoke 11. The other ends of the first and second connection structures are detachably connected. By designing the connection structure as a separate first and second connection structure, the electronic circuit board 3 and the magnetic yoke 11 can be assembled separately before connecting the first and second connection structures together. This not only reduces the difficulty of assembly but also facilitates the individual disassembly or replacement of the electronic circuit board 3 and the coil 2. This embodiment is a preferred embodiment of the connection structure, and also a first implementation of the first connection structure and a first implementation of the second connection structure.

[0044] like Figure 3 As shown, the electronic circuit board 3 is soldered to the winding of the coil 2 and then installed on the coil bracket 4. One end of the first connection structure is soldered to the grounding end of the electronic circuit board 3, and the other end of the first connection structure is connected to the second connection structure through the circular grounding component 120.

[0045] like Figure 1-4 As shown, as a first embodiment of the first connection structure, the first connection structure includes a grounding wire 110 connected to the grounding terminal of the electronic circuit board 3, and a grounding component 120 connected to the grounding wire 110. The grounding component 120 is provided with a wiring hole 121. After the wiring hole 121 is fitted onto the fastening screw 210 on the second connection structure, the grounding component 120 is fixed to the second connection structure. This not only has the characteristics of simple structure, but also can ensure a reliable electrical connection between the first connection structure and the second connection structure.

[0046] like Figure 5-8As shown, in a first embodiment of the second connection structure, the second connection structure includes a fastening screw 210 for fixing the magnetic yoke 11 to the base plate 310. The fastening screw 210 is an assembly, including a spring washer and a flat washer, as well as a fastening nut 220 and a spring piece 230 that cooperate with the fastening screw 210. The fastening screw 210 is electrically connected to the magnetic yoke 11. The grounding member 120 of the first connection structure fits the wiring hole 121 onto the fastening screw 210, and then the fastening nut 220 is connected to the fastening screw 210. The spring piece 230 can be pushed by the fastening nut 220 to make the grounding member 120 tightly adhere to the conductive clamp 240, so that the first connection mechanism and the second connection mechanism are electrically connected. Of course, the spring piece 230, as well as the spring washer and the flat washer, may not be provided. The fastening screw 210 has two functions: it not only fixes the magnetic yoke 11 and the base plate 310, but also forms an electrical connection. This eliminates the need for additional parts for electrical connection, saving on the number of parts and cost.

[0047] Specifically, in this embodiment, the iron core is a magnetic yoke 11, and one end of the magnetic yoke 11 is provided with a boss 12. The second connecting structure also includes a conductive clamp 240 disposed on the side of the boss 12 away from the base plate 310. The conductive clamp 240 has threaded holes 241 at both ends that mate with two fastening screws 210. A buffer 320 is provided between the base plate 310 and the boss 12. The two fastening screws 210 pass through the baffle 330 and the base plate 310 in sequence, and are connected via the conductive clamp 240. The engagement of the threaded hole 241 on the base plate 310 and the threaded hole on the fastening screw 210, during the tightening process, fixes the conductive clamp 240 to the raised structure of the base plate 310 on one hand, and pushes the upper surface of the boss 12 on the other hand, causing the boss 12 to press the buffer 320 onto the base plate 310. Under the reaction force of the buffer 320, the magnetic yoke 11 is fixed to the base 310, and the upper surface of the boss 12 is tightly attached to the lower surface of the conductive clamp 240. This establishes a reliable electrical connection between the conductive clamp 240 and the magnetic yoke 11. After the magnetic yoke 11 is tightened, the grounding member 120 of the first connecting structure is fitted onto one of the fastening screws 210 and positioned between the conductive clamp 240 and the spring piece 230. Then, the grounding member 120 is tightly attached to the conductive clamp 240 by the fastening nut 220, thus electrically connecting the first connecting mechanism and the second connecting mechanism.

[0048] It is understood that the threaded hole 241 on the conductive clamp 240 can also be a through hole without threads. Then, the two fastening screws 210 pass sequentially through the baffle 330, the base plate 310, and the conductive clamp 240, respectively, and connect to the corresponding fastening nut 220. The grounding component 120 of the first connecting structure is fitted onto one of the fastening screws 210 and is located between the conductive clamp 240 and the spring washer 230. The fastening nut 220, on one hand, fixes the conductive clamp 240 to the protruding structure of the base plate 310. The conductive clamp 240 pushes the boss 12, causing the boss 12 to press the buffer 320 tightly onto the base plate 310, and the reaction force of the buffer 320 fixes the boss 12. On the other hand, it pushes the grounding component 120 of the first connecting structure, making it tightly adhere to the conductive clamp 240.

[0049] The advantage of providing a threaded hole 241 on the conductive clamp 240 in this embodiment is that after fixing the magnetic yoke 11 and then tightening the grounding component 120, the tightened magnetic yoke 11 does not need to be loosened when disassembling or replacing the electronic circuit board 3 and the coil. Only the fastening nut 220 needs to be removed to take off the grounding component 120. Of course, the threaded hole 241 is a through hole, which is also within the protection scope of this invention.

[0050] The conductive clamp 240 is a metal part with conductivity. While pushing the boss 12, the conductive clamp 240 can form an electrical connection with the boss 12. It has two functions, just like the fastening screw 210. It does not require additional parts for electrical connection, thus saving the number of parts and cost.

[0051] It is understood that the base plate 310 is made of plastic and the buffer 320 is made of rubber. Both the plastic and rubber components are insulating, and the rubber component has compressive elasticity. The buffer 320 protects the magnetic yoke 11 and improves the fixing effect, ensuring that the upper surface of the boss 12 of the magnetic yoke 11 is tightly fitted with the conductive clamp surface, guaranteeing a reliable electrical connection between them. Of course, the buffer 320 can be omitted, and both are within the scope of protection of this invention. Preferably, two baffles 330 are provided on the side of the base plate 310 away from the conductive clamp 240. The two baffles 330 are respectively located below the boss of the base plate 310 and between the corresponding fastening screws 210. The fastening screws 210 pass sequentially through the baffles 330, the base plate 310, and the conductive clamp 240, with the head 211 of the fastening screw 210 pressing against the base plate 310 with the pushing baffle 330.

[0052] The baffle 330 is a metal component with high hardness and strength. Placing the relatively large baffle 330 between the boss of the base plate 310 and the fastening screw 210 increases the force-bearing area at the contact point, reducing the force per unit area at the contact point of the base plate 310 and increasing its strength. During the contactor's engagement process, the yoke 11 is continuously subjected to significant impact forces from the armature 13. The contact area between the fastening screw 210 of the yoke 11 and the base plate 310 experiences considerable tensile force. Because the standard flat washer on the fastening screw 210 has a small area, the force per unit area at the contact point with the base plate 310 is relatively large. This prevents the base plate 310 from easily breaking or being damaged after prolonged contactor operation, effectively extending its service life.

[0053] It is understood that although this embodiment uses two fastening screws 210, only one fastening screw 210 in the second connection structure is needed to reliably ground the electronic circuit board 3. In other embodiments, the number of fastening screws 210 and their positions in conjunction with the conductive clamp 240 are not limited; at least one fastening screw 210 connected to the conductive clamp 240 is sufficient. Furthermore, the second connection structure can also be electrically connected to the magnetic yoke 11 without fastening screws 210, or it can be electrically connected to the iron core through existing conductive parts in other contactors that mate with the iron core, and then electrically connected to the first connection structure; all of these fall within the scope of protection of this invention. Of course, without using the first and second connection mechanisms, directly connecting the iron core and the circuit board ground terminal with a single connector is also within the scope of protection of this invention.

[0054] like Figure 9 As shown, the second connection structure also includes a conductive leaf spring 250, which is electrically connected between the fastening screw 210 and the magnetic yoke 11, serving as a second electrical path between the fastening screw 210 and the iron core. The conductive clamp 240 forms a first electrical path between the fastening screw 210 and the iron core. Furthermore, the first and second electrical paths are respectively connected to the upper and lower surfaces of the boss 12, and are connected between the fastening screw 210 and the magnetic yoke 11 via two electrical paths, resulting in a more reliable grounding effect. When the conductive clamp 240, the fastening screw 210, and the baffle 330 fasten the magnetic yoke 11 to the base plate 310, the conductive clamp 240, the conductive leaf spring 250, and the fastening screw 210 are tightly fitted together at the position of the fastening screw 210, forming an electrical connection between the three.

[0055] Specifically, the conductive leaf spring 250 includes a limiting part 251 and a pressing part 253, and a connecting part 252 connecting one end of the limiting part 251 and the pressing part 253. The limiting part 251 is located between the base plate 310 and the conductive clamp 240 and is in contact with the conductive clamp 240. The limiting part 251 is provided with a limiting hole 255 for upper positioning and engagement with the fastening screw 210. The pressing part 253 is located between the bottom side of the boss 12 of the magnetic yoke 11 and the buffer 320. The pressing part 253 is bent to the side to form at least one arc surface 254. During the contactor's engagement and release process, the arc surface 254 formed by the side bending of the compression part 253 is compressed by the boss 12 and the buffer 320, generating elastic movement. The arc surface 254 reciprocates along the bottom surface of the boss 12, and the arc surface 254 in contact with the lower surface of the boss 12 continuously rubs against it. Even if the lower surface of the boss 12 or the conductive leaf spring 250 oxidizes and forms an oxide film or rusts, this repeated friction will remove the oxide film or rust, thus ensuring that the compression part 253 can reliably contact the boss 12 under various environmental conditions. In this embodiment, the compression part 253 has an overall wave-shaped structure with multiple arc surfaces 254, resulting in a more reliable fixing effect. Through the arc surfaces 254 on the compression part 253, the grounding scheme remains reliable even under various harsh environmental conditions, such as strong impact, vibration, salt spray, alternating damp heat, mechanical and electrical lifespan, etc.

[0056] Furthermore, the conductive leaf spring 250 and conductive clamp 240 form two electrical paths between the electronic circuit board 3 and the magnetic yoke 11, respectively. If one electrical path fails, the other electrical path ensures the reliability of the solution. Especially after prolonged mechanical and electrical lifespan, contactors are susceptible to strong impacts and vibrations, or in special environments such as salt spray, alternating damp heat, or high humidity and high heat, where metal contact parts are prone to rust, oxidation, or loosening, leading to unreliable electrical conduction. The first type of electrical conduction, formed by the conductive clamp 240, is a static, rigid conduction between the upper surface of the boss 12 of the magnetic yoke 11 and the lower surface of the conductive clamp 240. Under the aforementioned conditions, this can easily lead to unreliable conduction. The second type of electrical conduction, where both the conductive leaf spring 250 and the rubber component 320 are elastic, and the arc surface 254 contacting the lower surface of the boss 12 continuously rubs against it, removing the oxide film or rust generated under special environmental conditions, makes this electrical conduction elastic and dynamic, thus ensuring the reliability of the electrical conduction solution.

[0057] like Figure 10-11As shown, as a second embodiment of the second connection structure, this embodiment is basically the same as the first embodiment described above, except that this embodiment does not include the conductive leaf spring 250, but only uses the conductive clamp 240 to electrically connect the fastening screw 210 and the iron core. The reliability of this electrical connection is ensured solely by the reaction force generated by the compression of the buffer 320, which tightly adheres the magnetic yoke 11 to the conductive clamp 240.

[0058] like Figure 12-13 As shown, this third embodiment of the second connection structure is basically the same as the first embodiment described above, except that the structure of the conductive leaf spring 250 is different, and the contact position between the conductive leaf spring 250 and the boss 12 of the magnetic yoke 11 is also different. In this embodiment, the conductive leaf spring 250 does not have the connecting portion 252 of the first embodiment; instead, it only includes a limiting portion 251 and a pressing portion 253.

[0059] In the first embodiment, the connecting part 252 is located on the side of the boss 12, but the force direction of the conductive clamp 240 is parallel to it. The connecting part 252 can contact the side of the boss 12, but the reliability of the contact is poor, mainly relying on the electrical contact between the pressing part 253 and the magnetic yoke 11. In this embodiment, the pressing part 253 is located at the position of the connecting part 252, that is, between the side of the boss 12 and the protrusion structure on the base plate 310. The elastic deformation force of the arc surface 254 on the pressing part 253 contacts the side of the boss 12, ensuring the reliability of the contact. It is shown on the left side of the boss 12 in the figure, but it can also be on the right side, both of which are within the protection scope of this invention. Of course, in this embodiment, it is also possible to add an elastic element between the conductive leaf spring 250 and the protrusion on the base plate 310 or to use a buffer element 320, which can increase the elasticity of the pressing part 253. As a specific embodiment, the shape and position of the magnetic yoke 11 and the boss 12 can be adjusted or changed as needed. Of course, the boss 12 can also be omitted, as long as it forms electrical contact with the magnetic yoke 11.

[0060] like Figure 14As shown, as a second embodiment of the first connection structure, this embodiment changes the first embodiment of the first connection structure into two separate and detachable structures, facilitating the individual removal of the electronic circuit board 3 or coil 2 for repair or replacement. Specifically, the first connection structure includes a first wire 111 and a second wire 112. One end of the first wire 111 is connected to the ground terminal of the electronic circuit board 3, and the other end of the first wire 111 is provided with a insert 113. One end of the second wire 112 is provided with a spring 114 that cooperates with the insert 113 on the first wire 111, and the other end of the second wire 112 is provided with a grounding element 120. The grounding element 120 is provided with a wiring hole 121 that cooperates with the second connection structure. It can be understood that the positions of the spring 114 and the insert 113 can be adjusted as needed, and the type, shape, and size of the spring 114 and the insert 113 can also be adjusted as needed. The shape of the grounding element 120 and the wiring hole 121 can also be adjusted as needed. No specific limitations are made here.

[0061] like Figure 15 As shown, this third embodiment of the first connecting structure is basically the same as the second embodiment described above, and this embodiment also includes two separate detachable structures.

[0062] The first connection structure of this embodiment includes a PCB insert 115 and a second wire 112. The second wire 112 has the same structure as in the second embodiment described above. The PCB insert 115 can be inserted into the retaining spring 114 on the second wire 112 for connection. It is understood that the type, shape, size, etc. of the PCB insert 115 can be adjusted as needed, and no specific limitation is made here.

[0063] In the second and third embodiments of the first connection structure described above, it can be understood that the grounding wire 110 includes at least a first conductor 111 and a second conductor 112. One end of the first conductor 111 and the second conductor 112 are respectively connected to the grounding terminal of the grounding component 120 and the electronic circuit board 3. The other end of the first conductor 111 and the other end of the second conductor 112 are detachably connected together. This allows for convenient and quick disassembly of the coil 2 and the electronic circuit board 3 by simply inserting and unplugging the spring 114 and the insert 113 without disassembling the fastening nut 220 and the spring 230. Preferably, a protective sleeve (not shown in the figure) is also included. The protective sleeve covers the connection between the spring 114 and the insert 113, which improves the protective effect.

[0064] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the inventive concept, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A contactor comprising an iron core and a coil (2), and an electronic circuit board (3) connected to the coil (2), characterized in that: The electronic circuit board (3) is provided with a grounding terminal. The grounding terminal is electrically connected to the iron core through a connection structure, so that the iron core can also serve as the ground terminal of the circuit board in addition to driving the contactor to open and close, thereby increasing the area and volume of the ground terminal of the electronic circuit board. The iron core is regarded as the final ground terminal of the line. The iron core is not grounded in any other way. The iron core is a magnetic yoke (11) or an armature (13). The grounding terminal of the electronic circuit board (3) is connected to the magnetic yoke (11) or the armature (13) through the connection structure.

2. The contactor according to claim 1, characterized in that: The connection structure includes a first connection structure and a second connection structure that are separately configured. One end of the first connection structure is electrically connected to the grounding terminal of the electronic circuit board (3), and one end of the second connection structure is electrically connected to the iron core. The other end of the first connection structure and the other end of the second connection structure are detachably connected. The second connection structure includes a fixing member for fixing the iron core.

3. The contactor according to claim 2, characterized in that: The second connection structure includes a fastening screw (210) for fixing the iron core to the base plate (310), the fastening screw (210) being electrically connected to the iron core, and the first connection structure being electrically connected to the fastening screw (210).

4. The contactor according to claim 3, characterized in that: The first connection structure includes a grounding wire (110) connected to the grounding end of the electronic circuit board (3), and a grounding component (120) connected to the grounding wire (110). The grounding component (120) is provided with a wiring hole (121). After the wiring hole (121) is fitted onto the fastening screw (210), the fastening screw (210) is connected to the fastening nut (220), thus limiting the grounding component (120) on the fastening screw (210).

5. The contactor according to claim 3, characterized in that: The second connection structure also includes a conductive clamp (240) connected to the fastening screw (210). The conductive clamp (240) pushes the iron core to press against the base plate (310). The conductive clamp (240) is electrically connected to the fastening screw (210) and the iron core respectively.

6. The contactor according to claim 3 or 5, characterized in that: The second connection structure also includes a conductive leaf spring (250), which is electrically connected to the fastening screw (210) and the iron core respectively.

7. The contactor according to claim 3, characterized in that: A baffle (330) is provided between the base plate (310) and the head (211) of the fastening screw (210), and the head (211) of the fastening screw (210) pushes the baffle (330) to press against the base plate (310).

8. The contactor according to claim 6, characterized in that: The iron core has a boss (12) on its side. The conductive clamp (240) pushes the boss (12) to press it against the base plate (310). A buffer (320) is provided between the boss (12) and the base plate (310).

9. The contactor according to claim 6, characterized in that: The conductive leaf spring (250) includes a limiting part (251) and a pressing part (253) connected together. The limiting part (251) is located between the base plate (310) and the conductive clamp (240) and is in contact with the conductive clamp (240). The pressing part (253) is provided with at least one arc surface (254), which is pressed against the iron core and electrically connected to the iron core.

10. The contactor according to claim 9, characterized in that, The conductive leaf spring (250) also includes a connecting part (252) connected between the limiting part (251) and one end of the pressing part (253). The side of the iron core is provided with a boss (12). A buffer (320) is provided between the boss (12) and the base plate (310). The pressing part (253) is located between the bottom side of the boss (12) of the magnetic yoke (11) and the buffer (320).

11. The contactor according to claim 4, characterized in that: The grounding wire (110) includes at least a first conductor (111) and a second conductor (112). One end of the first conductor (111) and the second conductor (112) are respectively connected to the grounding terminal of the grounding component (120) and the electronic circuit board (3). The other end of the first conductor (111) and the other end of the second conductor (112) are detachably connected.

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