Direct current contactor with novel moving contact structure
By introducing a limiting cavity and limiting structure into the contactor, the problem of tilting of the moving contact piece is solved, the assembly consistency and switching performance of the contactor are improved, the heat resistance of the push rod is enhanced, and the reliability of the contactor is ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-03-24
AI Technical Summary
In existing contactors, the moving contact spring acts directly on the moving contact piece, which can easily cause the moving contact piece to tilt, resulting in poor breaking capacity and inconsistent contactor performance.
A limiting cavity is used to limit the movement of the contact spring. The moving contact piece and push rod are limited by the limiting cavity, limiting boss, and clamping claws to ensure that they do not tilt during movement. The extension and retraction of the moving contact spring are stabilized by the guide plate and the return spring.
It improves the assembly consistency of the contactor, avoids defective products, enhances the heat resistance of the push rod, and improves the switching performance and reliability of the contactor.
Smart Images
Figure CN224036303U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the field of contactors, in particular to a direct-current contactor with a novel movable contact structure. BACKGROUND
[0002] A contactor is a widely used switch electric appliance, which realizes the on-off of a main circuit through a control circuit by using electromagnetic principle, has the advantages of strong breaking current capacity, rapid action, safe operation, frequent operation and remote control, and is widely applied to charging piles. The working principle of the contactor is that when the coil of the contactor is powered, the coil current generates a magnetic field, the generated magnetic field generates electromagnetic attraction on the static iron core to attract the movable iron core and drive the movable contact piece to act, so that the movable contact piece is attracted to the static contact and the circuit is turned on.
[0003] The existing contactor comprises a movable contact piece, a push rod and a movable contact head compression spring, the movable contact piece is arranged on the push rod, and the movable contact head compression spring is used to drive the movable contact piece to move towards the static contact head, so as to drive the push rod to move, the push rod drives the auxiliary contact to move, and the on-off of the circuit is realized. In the existing contactor, the movable contact head compression spring directly acts on the movable contact piece, the movable contact head compression spring has no limit, and in the use process, the movable contact head compression spring is easy to twist to cause the movable contact piece to tilt, so that the breaking capacity of the produced contactor is poor and the consistency is not good. CONTENT OF THE INVENTION
[0004] In order to solve the above technical problems, the application provides a direct-current contactor with a novel movable contact structure.
[0005] The application provides a direct-current contactor with a novel movable contact structure, which adopts the following technical scheme:
[0006] The direct-current contactor with the novel movable contact structure comprises a movable contact head assembly and a movable contact head compression spring, the movable contact head compression spring is used to drive the movable contact head assembly to move towards the static contact head, a limiting cavity is formed on the movable contact head assembly, and the limiting cavity is used to accommodate an end portion of the movable contact head compression spring to limit the movable contact head compression spring.
[0007] By limiting the movable contact head compression spring through the limiting cavity, it is tried to avoid the tilting of the movable contact piece in the movement process, the assembly consistency is improved, the structure is avoided to be poor, and the product reliability is improved.
[0008] Optionally, the push rod is further arranged, the movable contact head assembly comprises a movable contact piece and a connecting plate, the movable contact piece and the connecting plate are arranged on the push rod, an avoiding hole is arranged through the push rod, a limiting boss is arranged on the connecting plate, the avoiding hole is used to accommodate the limiting boss, and the limiting cavity is formed by the outer wall of the limiting boss, the side wall of the connecting plate and the inner wall of the avoiding hole.
[0009] By adopting the technical scheme, the moving contact piece and the connecting plate are arranged on the push rod, the movement of the moving contact piece drives the auxiliary contact to move, the circuit is turned on and turned off, and the limiting cavity is formed by the outer wall of the limiting boss, the side wall of the connecting plate and the inner wall of the avoiding hole, so that machining and assembly are facilitated.
[0010] Optionally, the limiting boss comprises a large-diameter section and a small-diameter section, the small-diameter section is located on one side of the large-diameter section close to the moving contact spring, the small-diameter section is used for sleeving the moving contact spring, and the outer wall of the large-diameter section is used for abutting against the inner wall of the avoiding hole to limit the push rod.
[0011] By adopting the technical scheme, the limiting boss not only limits the moving contact spring, but also limits the push rod, so that the heat resistance of the push rod is enhanced, and the on-off performance of the contactor is improved.
[0012] Optionally, a plurality of clamping claws are arranged on the push rod, and clamping grooves are arranged on the clamping claws, the clamping grooves are used for accommodating and clamping the connecting plate and the moving contact piece.
[0013] By adopting the technical scheme, the clamping claws can clamp and limit the connecting plate and the moving contact piece, the connecting plate and the moving contact piece are fixed on the push rod, machining is facilitated, and the positioning effect is good.
[0014] Optionally, the plurality of clamping claws are arranged on two sides of the push rod.
[0015] By adopting the technical scheme, the clamping claws are arranged on two sides of the push rod, so that the connecting plate and the moving contact piece can be inserted into the clamping grooves of the clamping claws from the other two sides of the push rod, and assembly of the connecting plate and the moving contact piece is facilitated.
[0016] Optionally, a core rod is further arranged, the moving contact piece is slidably arranged on the core rod, the moving contact spring is sleeved on the core rod, a clearance hole is arranged on the connecting plate and the moving contact piece and used for allowing the core rod to pass through, and the moving contact spring is used for abutting the moving contact piece and the connecting plate against the core rod.
[0017] By adopting the technical scheme, when the moving contact piece and the connecting plate slide relative to the core rod, the moving contact spring is compressed, and the moving contact spring can reset the moving contact piece and the connecting plate.
[0018] Optionally, a guide plate is further arranged, a guide hole is arranged on the guide plate and used for guiding movement of the core rod, a limiting groove is arranged on the guide plate and communicates with the guide hole, the limiting groove is used for accommodating an end portion of the moving contact spring, and a bottom wall of the limiting groove is used for abutting and compressing the end portion of the moving contact spring.
[0019] By adopting the above technical solution, the guide plate can not only guide the core rod, but also limit the other end of the moving contact spring, making the extension and retraction of the moving contact spring more stable.
[0020] Optionally, the system also includes a flange with a limiting hole, and a mounting boss on the guide plate. The outer wall of the mounting boss is used to abut against the inner wall of the limiting hole to limit the guide plate.
[0021] By adopting the above technical solution, the outer wall of the mounting boss abuts against the inner wall of the limiting hole to position the guide plate, which facilitates the assembly of the guide plate.
[0022] Optionally, a return spring is also included, which is sleeved on the core rod. The core rod, the mounting boss, and the inner wall of the limiting hole form a limiting groove, which is used to accommodate the end of the return spring to limit the return spring.
[0023] By adopting the above technical solution, the limiting hole can not only position the guide plate, but also cooperate with the mounting boss to limit the end of the return spring.
[0024] Optionally, each end of the core rod is provided with a limiting member, which is used to abut against the moving contact piece to limit the movement of the moving contact piece.
[0025] By adopting the above technical solution, the movement of the moving contact piece is limited by the limiting component, which facilitates processing and has a good limiting effect.
[0026] In summary, this application includes at least one of the following beneficial technical effects:
[0027] 1. Minimize the tilting of moving contact pieces during movement to improve assembly consistency, structural design to avoid defective products, and improve product reliability;
[0028] 2. The limiting boss can not only limit the moving contact spring, but also limit the push rod, thereby enhancing the heat resistance of the push rod and improving the switching performance of the contactor;
[0029] 3. The clamping jaws can clamp and limit the connection plate and the moving contact piece, which is convenient for processing and has a good positioning effect. Attached Figure Description
[0030] Figure 1 This is a structural schematic diagram of an embodiment of this application.
[0031] Figure 2 This is a cross-sectional view of an embodiment of this application.
[0032] Figure 3 This is an exploded view of this application.
[0033] Explanation of reference numerals in the attached drawings: 1. Moving contact assembly; 11. Moving contact piece; 111. Clearance hole; 12. Limiting cavity; 2. Moving contact compression spring; 3. Connecting plate; 4. Push rod; 41. Clearance hole; 5. Limiting boss; 51. Large diameter section; 52. Small diameter section; 6. Clamping claw; 61. Clamping groove; 7. Core rod; 8. Guide plate; 81. Guide hole; 82. Limiting groove; 83. Mounting boss; 9. Flange; 91. Limiting hole; 100. Return spring; 110. Receiving groove; 120. Limiting element; 130. Washer; 140. Annular groove; 150. Iron core; 151. Stepped hole. Detailed Implementation
[0034] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.
[0035] This application discloses a DC contactor with a novel moving contact structure. (Refer to...) Figure 1 and Figure 2 The system includes a core assembly, which includes a moving contact assembly 1 and a moving contact spring 2. The moving contact spring 2 is used to push the moving contact assembly 1 toward the stationary contact. A limiting cavity 12 is formed on the moving contact assembly 1. The limiting cavity 12 is used to accommodate the end of the moving contact spring 2 to limit the movement of the moving contact spring 2.
[0036] Reference Figure 2 and Figure 3 The DC contactor also includes a push rod 4, which drives the auxiliary contact to move. The moving contact assembly 1 includes a moving contact piece 11 and a connecting plate 3. The moving contact piece 11 abuts against the connecting plate 3, and both the moving contact piece 11 and the connecting plate 3 are fixed to the push rod 4. A clearance hole 41 is provided through the push rod 4. A limiting boss 5 is integrally formed on the side wall of the connecting plate 3 facing the moving contact spring 2. The limiting boss 5 is a stepped boss, which includes a large diameter section 51 and a small diameter section 52. The small diameter section 52 is located on the side of the large diameter section 51 closer to the moving contact spring 2. The limiting cavity 12 is formed by the outer peripheral surface of the small diameter section 52, the side wall of the large diameter section 51, and the inner peripheral surface of the clearance hole 41. The outer circumferential surface of the large-diameter section 51 is inserted into the clearance hole 41 and abuts against the inner circumferential surface of the clearance hole 41. The side wall of the push rod 4 on the outer circumference of the clearance hole 41 abuts against the side wall of the connecting plate 3 to position the connecting plate 3.
[0037] Reference Figure 1 and Figure 3 Multiple clamping claws 6 are integrally formed on the push rod 4. The multiple clamping claws 6 are respectively located on the ends of the push rod 4 on both sides of the moving contact piece 11. The clamping claws 6 are provided with clamping grooves 61 extending in a direction perpendicular to the moving direction of the moving contact piece 11. The clamping grooves 61 are used to accommodate and clamp the connecting plate 3 and the moving contact piece 11.
[0038] Reference Figure 2 andFigure 3 Both the connecting plate 3 and the moving contact piece 11 have clearance holes 111, with the clearance holes 111 on the connecting plate 3 located on the limiting boss 5. A core rod 7, which is a stepped shaft, passes through the clearance hole 111. A guide plate 8 is fitted around the core rod 7, and a guide hole 81 extending axially along the core rod 7 is provided on the guide plate 8. The core rod 7 passes through the guide hole 81, which guides the movement of the core rod 7. A limiting groove 82, communicating with the guide hole 81, is provided on the side wall of the guide plate 8 near the moving contact spring 2. The radial dimension of the limiting groove 82 is larger than the radial dimension of the guide hole 81. A washer 130 is fitted inside the limiting groove 82 on the core rod 7. The washer 130 abuts against the shoulder of the core rod 7. The moving contact spring 2 is fitted on the core rod 7. The moving contact spring 2 is pressed between the washer 130 and the large diameter section 51. The limiting groove 82 limits the end of the moving contact spring 2 away from the connecting plate 3.
[0039] Reference Figure 2 and Figure 3 Two limiting members 120 are fixedly installed on the core rod 7, and each limiting member 120 is snapped and fixed at both ends of the core rod 7 along its length. The limiting members 120 are used to abut against the moving contact piece 11 to limit the movement of the moving contact piece 11. In this embodiment, the limiting member 120 is an open retaining ring, and the core rod 7 has an annular groove 140, in which the limiting member 120 is snapped.
[0040] Reference Figure 2 and Figure 3 The core rod 7 is fitted with a flange 9, and a limiting hole 91 is formed through the flange 9 along the axial direction of the core rod 7. The core rod 7 passes through the limiting hole 91. A mounting boss 83 is integrally formed on the guide plate 8. The mounting boss 83 is inserted into the limiting hole 91, and the outer peripheral surface of the mounting boss 83 abuts against the inner peripheral surface of the limiting hole 91 to position the guide plate 8. A return spring 100 is fitted on the core rod 7. The limiting hole 91, the side wall of the mounting boss 83, and the outer peripheral surface of the core rod 7 form a receiving groove 110. The receiving groove 110 is used to receive the end of the return spring 100 to limit the return spring 100. The return spring 100 and the moving contact compression spring 2 are respectively located on both sides of the guide plate 8.
[0041] Reference Figure 2 Figure 3A core rod 7 is fitted with an iron core 150, and a limiting member 120 abuts against the side wall of the iron core 150. A stepped hole 151 extending axially along the core rod 7 is formed on the iron core 150. The small-diameter section of the stepped hole 151 is located on the side of the large-diameter section away from the return spring 100. The small-diameter section of the stepped hole 151 abuts against the shoulder of the core rod 7 to cooperate with the limiting member 120 and fix the iron core 150. The end of the return spring 100 away from the guide plate 8 is inserted into the large-diameter section of the stepped hole 151 and abuts against the side wall of the large-diameter section of the small-diameter section of the stepped hole 151 to limit the return spring 100.
[0042] The assembly principle of a DC contactor with a novel moving contact structure according to an embodiment of this application is as follows: The assembler first inserts the mounting boss 83 of the guide plate 8 into the limiting hole 91 of the flange 9, then sequentially places the washer 130 and the moving contact spring 2 into the limiting groove 82 of the guide plate 8, then inserts the connecting plate 3 and the moving contact piece 11 into the clamping groove 61 along a direction perpendicular to the movement direction of the moving contact piece 11, and then sequentially passes the core rod 7 through the limiting hole 91 on the flange 9, the guide hole 81 on the guide plate 8, the washer 130, and the moving contact. The compression spring 2, the connecting plate 3, and the clearance hole 111 on the moving contact piece 11 are then fitted together. The limiting member 120 is then inserted into the annular groove 140 to complete the assembly of the moving contact compression spring 2, the connecting plate 3, and the moving contact piece 11. Next, the return spring 100 is fitted onto the core rod 7, and then the iron core 150 is fitted onto the core rod 7. Finally, the limiting member 120 is secured to the end of the core rod 7 away from the moving contact piece 11 to complete the assembly of the return spring 100 and the iron core 150. This completes the assembly of the iron core assembly of the entire DC contactor.
[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A DC contactor with a novel moving contact structure, comprising a moving contact assembly (1) and a moving contact spring (2), wherein the moving contact spring (2) is used to push the moving contact assembly (1) toward the stationary contact, characterized in that: A limiting cavity (12) is formed on the moving contact assembly (1), the limiting cavity (12) is used to accommodate the end of the moving contact spring (2) to limit the moving contact spring (2).
2. The DC contactor with a novel moving contact structure according to claim 1, characterized in that: It also includes a push rod (4), the moving contact assembly (1) includes a moving contact piece (11) and a connecting plate (3), the moving contact piece (11) and the connecting plate (3) are disposed on the push rod (4), the push rod (4) is provided with a clearance hole (41), the connecting plate (3) is provided with a limiting boss (5), the clearance hole (41) is used to accommodate the limiting boss (5), and the limiting cavity (12) is formed by the outer wall of the limiting boss (5), the side wall of the connecting plate (3) and the inner wall of the clearance hole (41).
3. The DC contactor with a novel moving contact structure according to claim 2, characterized in that: The limiting boss (5) includes a large diameter section (51) and a small diameter section (52). The small diameter section (52) is located on the side of the large diameter section (51) near the moving contact spring (2). The small diameter section (52) is used for the moving contact spring (2) to be sleeved. The outer wall of the large diameter section (51) is used to abut against the inner wall of the clearance hole (41) to limit the push rod (4). The limiting cavity (12) is formed by the outer wall of the small diameter section (52), the side wall of the large diameter section (51) and the inner wall of the clearance hole (41).
4. The DC contactor with a novel moving contact structure according to claim 2, characterized in that: The push rod (4) is provided with multiple clamping claws (6), and the clamping claws (6) are provided with clamping grooves (61). The clamping grooves (61) are used to accommodate and clamp the connecting plate (3) and the moving contact piece (11).
5. The DC contactor with a novel moving contact structure according to claim 4, characterized in that: Multiple clamping claws (6) are respectively located on both sides of the push rod (4).
6. The DC contactor with a novel moving contact structure according to claim 2, characterized in that: It also includes a core rod (7), the movable contact piece (11) is slidably disposed on the core rod (7), the movable contact spring (2) is sleeved on the core rod (7), and the connecting plate (3) and the movable contact piece (11) are both provided with clearance holes (111) for the core rod (7) to pass through. The movable contact spring (2) is used to press the movable contact piece (11) and the connecting plate (3) against the core rod (7).
7. The DC contactor with a novel moving contact structure according to claim 6, characterized in that: It also includes a guide plate (8), on which a guide hole (81) is provided for guiding the movement of the core rod (7), and a limiting groove (82) communicating with the guide hole (81) is provided on the guide plate (8). The limiting groove (82) is used to accommodate the end of the moving contact spring (2), and the bottom wall of the limiting groove (82) is used for the end of the moving contact spring (2) to abut and compress.
8. The DC contactor with a novel moving contact structure according to claim 7, characterized in that: It also includes a flange (9), on which a limiting hole (91) is provided, and a mounting boss (83) is provided on the guide plate (8). The outer wall of the mounting boss (83) is used to abut against the inner wall of the limiting hole (91) to limit the guide plate (8).
9. The DC contactor with a novel moving contact structure according to claim 8, characterized in that: It also includes a return spring (100), which is sleeved on the core rod (7). The core rod (7), the mounting boss (83) and the inner wall of the limiting hole (91) form a receiving groove (110). The receiving groove (110) is used to receive the end of the return spring (100) to limit the return spring (100).
10. The DC contactor with a novel moving contact structure according to claim 6, characterized in that: The core rod (7) is provided with limiting members (120) at both ends. The limiting members (120) are used to abut against the moving contact piece (11) to limit the movement of the moving contact piece (11).