Floating type iron core assembly and direct current contactor

Abstract

The floating type iron core assembly comprises an iron sheet, a guiding piece is assembled above the iron sheet, the guiding piece vertically penetrates through the iron sheet, a lining is installed on the iron sheet, a center shaft is installed in the axial center of the lining vertically penetrating through the lining, the upper portion of the center shaft is sleeved with a movable contact piece, and the lower portion of the center shaft is sleeved with a movable iron core. A long pressure spring is pressed between the movable iron core and the iron sheet; the lining located above the guide piece laterally extends to form an outer convex structure, a short pressure spring is pressed between the upper part of the outer convex structure and the movable contact piece, and a floating structure of the lining relative to the guide piece and the central shaft relative to the lining is formed by the long pressure spring and the short pressure spring; therefore, a brand new floating type iron core assembly structure is provided, the problem that an existing gasket is prone to neglected installation or wrong installation is solved, the stability and reliability of the elastic force of the spring can be effectively guaranteed and controlled, and the stability of the iron core assembly is greatly improved and guaranteed.

Description

Technical Field

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

[0002] A contactor is an electronic control device, usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. The contactor plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0003] A DC contactor is a type of contactor. In the iron core assembly of the DC contactor, gaskets, springs, and moving contacts are usually installed on the central axis. For example, in the existing patent application number 2023236039193, the publication date 2024.08.13, and the name of a high-voltage DC contactor with sealed arc extinguishing, it is disclosed that the iron core mechanism assembly includes a movable shaft located in the middle, and the movable shaft located above the yoke is provided with gaskets, contact springs, and contact plates via steps and retaining springs. The movable shaft located below the yoke is provided with a moving iron core via steps and retaining springs, and a core spring is installed on the movable shaft between the moving iron core and the yoke.

[0004] In the prior art, when installing the core assembly in the DC contactor, it is very easy to miss the gasket on the central axis, or to install the gasket in the wrong way. In addition, the gasket abuts against the bottom end of the contact spring, and the stable control of the spring force cannot be guaranteed. Summary of the invention

[0005] To solve the above problems, the present invention provides a floating core assembly and a DC contactor with a reasonable structure, thereby avoiding the problem of easy missing or wrong installation of existing gaskets, and being able to effectively ensure and control the stability and reliability of the spring elastic force.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A floating iron core assembly comprises an iron sheet, a guide piece is arranged above the iron sheet, a bushing is installed through the guide piece and the iron sheet from top to bottom, a central shaft is installed through the bushing at the axial center from top to bottom, a moving contact piece is mounted on the upper part of the central shaft, a moving iron core is mounted on the lower part of the central shaft, a long compression spring is pressed between the moving iron core and the iron sheet; the bushing located above the guide piece extends laterally to form an outward convex structure, a short compression spring is pressed between the upper part of the outward convex structure and the moving contact piece, thereby forming a floating structure of the bushing relative to the guide piece and the central shaft relative to the bushing through the long compression spring and the short compression spring.

[0008] As a further improvement of the above technical solution:

[0009] The length of the short compression spring is smaller than that of the long compression spring, and the material diameter of the short compression spring is larger than the material diameter of the long compression spring.

[0010] It also includes a switch top rod, which is installed in the middle of the moving contact piece; the top of the short compression spring is in contact with the bottom surface of the moving contact piece, the top of the short compression spring is accommodated in the switch top rod, and the top of the short compression spring is limited and guided by the switch top rod.

[0011] The top end of the central axis of the moving contact piece extending upwardly extends laterally to form a flange, and the bottom surface of the flange is in contact with the top surface of the moving contact piece.

[0012] The inner diameter of the short compression spring is matched with the outer diameter of the bushing, and the short compression spring is sleeved on the bushing above the outer convex structure.

[0013] The middle part of the guide member is provided with a stepped hole 1 for accommodating and fitting the bushing, and the outer protrusion structure of the bushing is located at a large hole portion with a larger diameter above the stepped hole 1; the bottom surface of the outer protrusion structure is in contact with the bottom surface of the large hole portion.

[0014] The edge of the opening of the small hole with a smaller diameter located below the step hole extends downward to form a convex edge, which extends downward into the through hole of the iron sheet; the convex edge is located between the inner wall surface of the through hole and the outer wall surface of the bushing.

[0015] The long compression spring set is located on the outer wall surface of the bushing, and a step hole 2 is opened on the moving iron core; the top end of the long compression spring fits with the bottom surface of the convex edge, and the long compression spring and the bottom end of the bushing extend downward into the large hole with a larger diameter at the upper part of the step hole 2, and the bottom end of the long compression spring fits with the bottom surface of the large hole of the step hole 2.

[0016] An annular groove is provided on the central axis of the moving iron core extending downward along the circumferential direction, and a retaining spring is arranged in the annular groove to limit the moving iron core in the axial direction of the central axis by the retaining spring.

[0017] A DC contactor comprises any one of the above-mentioned floating core components.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention sets a bushing in the middle of the central shaft, and forms a floating structure of the bushing relative to the guide member and the central shaft relative to the bushing through a long compression spring and a short compression spring; thus, a new floating core assembly structure is proposed, which avoids the problem of the existing gasket being easily missed or mis-assembled, can effectively ensure and control the stability and reliability of the spring elastic force, and greatly improves the stability of the core assembly;

[0020] The present invention also includes the following advantages:

[0021] When in use, after power is turned on, the moving iron core is forced to move upward, which will overcome the gravity of the bushing and the elastic force of the spring, push the bushing upward, and the bushing pushes the moving contact piece upward through the short compression spring, so that the moving contact piece contacts the static contact piece above; after power is turned off, the upward electromagnetic force on the moving iron core disappears, and the moving iron core, bushing, and moving contact piece will be reset under the action of the long compression spring and the short compression spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the present invention.

[0023] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0024] Figure 3 It is an exploded view of the present invention.

[0025] Figure 4 It is a schematic structural diagram of the bushing of the present invention.

[0026] Among them: 1. Central axis; 2. Switch top rod; 3. Moving contact piece; 4. Iron sheet; 5. Guide piece; 6. Short compression spring; 7. Bushing; 8. Long compression spring; 9. Moving iron core; 10. Circlip;

[0027] 11. flange; 12. annular groove;

[0028] 41. Through hole;

[0029] 51. Step hole 1; 52. Convex edge;

[0030] 71. sleeve body; 72. external convex structure;

[0031] 91. Step hole 2. DETAILED DESCRIPTION

[0032] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, a floating iron core assembly of this embodiment includes an iron sheet 4, a guide member 5 is installed above the iron sheet 4, a bushing 7 is installed through the guide member 5 and the iron sheet 4 from top to bottom, a central shaft 1 is installed through the bushing 7 from top to bottom and in the axial center, a moving contact piece 3 is mounted on the upper part of the central shaft 1, a moving iron core 9 is mounted on the lower part of the central shaft 1, and a long compression spring 8 is pressed between the moving iron core 9 and the iron sheet 4; the bushing 7 located above the guide member 5 extends laterally to form an outer convex structure 72, and a short compression spring 6 is pressed between the upper part of the outer convex structure 72 and the moving contact piece 3, so that the long compression spring 8 and the short compression spring 6 form a floating structure of the bushing 7 relative to the guide member 5 and the central shaft 1 relative to the bushing 7.

[0034] In this embodiment, a bushing 7 is installed in the middle of the center shaft 1, and a floating structure of the bushing 7 relative to the guide member 5 and the center shaft 1 relative to the bushing 7 is formed through a long compression spring 8 and a short compression spring 6; thereby a new floating core assembly structure is proposed, which avoids the problem of easy missing or wrong installation of existing gaskets and can effectively ensure and control the stability and reliability of the spring elastic force.

[0035] In this embodiment, the bushing 7 is used as a force transmission medium when the moving iron core 9 is in motion, and a short compression spring 6 is pressed between the circumferential convex structure 72 of the bushing 7 and the moving contact piece 3, which can effectively ensure the timely and stable actuation of the moving contact piece 3 through the bushing 7. At the same time, the up and down movement of the bushing 7 relative to the center axis 1 is stable and smooth, which also effectively ensures the stability of the spring elastic force, and is convenient for the control and use of the spring elastic force.

[0036] The length of the short compression spring 6 is smaller than that of the long compression spring 8 , and the material diameter of the short compression spring 6 is larger than the material diameter of the long compression spring 8 .

[0037] It also includes a switch top rod 2, which is installed in the middle of the moving contact piece 3; the top of the short compression spring 6 is in contact with the bottom surface of the moving contact piece 3, and the top of the short compression spring 6 is accommodated in the switch top rod 2. The top of the short compression spring 6 is limited and guided by the switch top rod 2, which effectively ensures the reliability of the short compression spring 6 abutting against the bottom surface of the moving contact piece 3.

[0038] The top end of the central axis 1 extending upwardly from the movable contact piece 3 extends laterally to form a flange 11, the bottom surface of the flange 11 is in contact with the top surface of the movable contact piece 3, and the movable contact piece 3 is limited by the flange 11 to effectively prevent the movable contact piece 3 from falling off.

[0039] The inner diameter of the short compression spring 6 matches the outer diameter of the bushing 7 , and the short compression spring 6 is sleeved on the bushing 7 above the outer protruding structure 72 .

[0040] In this embodiment, the switch top rod 2 plays a role in structural stability and position limiting on the upper part of the short compression spring 6, and the bushing 7 plays a role in structural stability and position limiting on the lower part of the short compression spring 6, which can effectively ensure the structural reliability of the short compression spring 6 during use.

[0041] exist Figure 4 In the illustrated embodiment, the bushing 7 includes a sleeve body 71 having a cylindrical structure, and the sleeve body 71 extends circumferentially and laterally to form an outer convex structure 72 .

[0042] In one embodiment, the axial length of the sleeve body 71 located above the outer protruding structure 72 is smaller than the axial length of the sleeve body 71 located below the outer protruding structure 72, and the outer diameter of the sleeve body 71 located above the outer protruding structure 72 is larger than the outer diameter of the sleeve body 71 located below the outer protruding structure 72; thereby, while effectively ensuring the structural strength and structural reliability of the floating structure through the sleeve 7, the stability of force transmission through the sleeve 7 is effectively guaranteed.

[0043] A stepped hole 51 for accommodating and fitting the bushing 7 is provided in the middle of the guide member 5, and the outer protrusion structure 72 of the bushing 7 is located at the large hole portion with a larger diameter above the stepped hole 51; the bottom surface of the outer protrusion structure 72 is in contact with the bottom surface of the large hole portion.

[0044] In this embodiment, the outer protruding structure 72 of the bushing 7 is accommodated in the large hole portion with a larger diameter above the step hole 51, and the bottom surface of the large hole portion acts as a downward limit for the outer protruding structure 72.

[0045] The edge of the small hole with a smaller diameter located below the step hole 51 extends downward to form a convex edge 52, which extends downward into the through hole 41 of the iron sheet 4; the convex edge 52 is located between the inner wall surface of the through hole 41 and the outer wall surface of the bushing 7.

[0046] The long compression spring 8 is set on the outer wall of the bushing 7, and a step hole 91 is opened on the moving iron core 9; the top of the long compression spring 8 is in contact with the bottom of the convex edge 52, and the long compression spring 8 and the bottom of the bushing 7 extend downward into the large hole with a larger diameter at the top of the step hole 91, and the bottom of the long compression spring 8 is in contact with the bottom of the large hole of the step hole 91, so that when the moving iron core 9 is forced to move upward, it can push the trigger bushing 7 to move upward through the moving iron core 9.

[0047] An annular groove 12 is circumferentially formed on the central shaft 1 extending downward from the movable iron core 9 , and a retaining spring 10 is installed in the annular groove 12 . The retaining spring 10 restricts the movable iron core 9 axially on the central shaft 1 , thereby effectively preventing the movable iron core 9 from being separated from the central shaft 1 .

[0048] In this embodiment, a protrusion is formed on the bottom surface of the guide member 5 extending downward, and a hole corresponding to the protrusion and for the protrusion to be fitted is opened on the iron sheet 4, so that the guide member 5 and the iron sheet 4 are installed in coordination.

[0049] The floating iron core assembly in this embodiment effectively simplifies the structure of the center shaft 1 by installing a bushing 7 on the center shaft 1, pressing a short compression spring 6 against the moving contact piece 3 through the bushing 7 at the top, and abutting against the moving iron core 9 through the bushing 7 at the bottom to transmit power. While the center shaft 1 serves as a structural support, it only needs to disengage the moving contact piece 3 and the moving iron core 9 at both ends, thereby simplifying and facilitating the processing and assembly of the center shaft 1.

[0050] When assembling the floating iron core assembly of the present invention, the moving contact piece 3 is first installed in the switch top rod 2, and then the central axis 1 passes through the switch top rod 2 and the moving contact piece 3 in turn, and then the short compression spring 6 and the bushing 7 are installed on the central axis 1, and then installed together on the guide member 5 and the iron sheet 4, and finally the long compression spring 8, the moving iron core 9, and the retaining spring 10 are installed to complete the assembly.

[0051] The use of the present invention is:

[0052] In actual use, after power is turned on, the moving iron core 9 is forced to move upward, which will overcome the gravity of the bushing 7 and the spring force, push the bushing 7 upward, and the bushing 7 pushes the moving contact piece 3 upward through the short compression spring 6, so that the moving contact piece 3 contacts the static contact piece above; after power is turned off, the upward electromagnetic force on the moving iron core 9 disappears, and the moving iron core 9, bushing 7, and moving contact piece 3 will be reset under the action of the long compression spring 8 and the short compression spring 6.

[0053] This embodiment also provides a DC contactor, comprising any of the above floating core components.

[0054] The floating core assembly in this embodiment can be installed and used in a corresponding DC contactor, such as a single-contact DC contactor, a double-contact DC contactor, etc., according to actual needs.

[0055] The present invention avoids the problem of easy missing or wrong installation of existing gaskets, can effectively ensure and control the stability and reliability of the spring elastic force, and greatly improves the stability of the iron core assembly.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A floating core assembly, characterized in that: The invention comprises an iron sheet (4), a guide member (5) is arranged above the iron sheet (4), a bushing (7) is installed through the guide member (5) and the iron sheet (4) from top to bottom, a central shaft (1) is installed through the bushing (7) from top to bottom and at the axial center, a moving contact piece (3) is mounted on the upper part of the central shaft (1), a moving iron core (9) is mounted on the lower part of the central shaft (1), and a long compression spring (8) is pressed between the moving iron core (9) and the iron sheet (4); the bushing (7) located above the guide member (5) extends laterally to form an outer convex structure (72), and a short compression spring (6) is pressed between the outer convex structure (72) and the moving contact piece (3), so that a floating structure of the bushing (7) relative to the guide member (5) and the central shaft (1) relative to the bushing (7) is formed through the long compression spring (8) and the short compression spring (6).

2. A floating core assembly as claimed in claim 1, characterized in that: The length of the short compression spring (6) is smaller than the length of the long compression spring (8), and the material diameter of the short compression spring (6) is larger than the material diameter of the long compression spring (8).

3. A floating core assembly as claimed in claim 1, characterized in that: It also includes a switch top rod (2), which is installed in the middle of the moving contact piece (3); the top of the short compression spring (6) is in contact with the bottom surface of the moving contact piece (3), the top of the short compression spring (6) is accommodated in the switch top rod (2), and the top of the short compression spring (6) is limited and guided by the switch top rod (2).

4. A floating core assembly as claimed in claim 1, characterized in that: The top end of the central axis (1) extending upwardly from the movable contact piece (3) extends laterally to form a flange (11), and the bottom surface of the flange (11) is in contact with the top surface of the movable contact piece (3).

5. A floating core assembly as claimed in claim 1, characterized in that: The inner diameter of the short compression spring (6) is matched with the outer diameter of the bushing (7), and the short compression spring (6) is sleeved on the bushing (7) above the outer convex structure (72).

6. A floating core assembly as claimed in claim 1, characterized in that: The guide member (5) has a stepped hole (51) in the middle thereof for receiving and fitting the bushing (7). The outer protruding structure (72) of the bushing (7) is located above the stepped hole (51) at a large hole portion with a larger diameter. The bottom surface of the outer protruding structure (72) is in contact with the bottom surface of the large hole portion.

7. A floating core assembly as claimed in claim 6, characterized in that: The edge of the opening of the small hole portion with a smaller diameter located below the step hole (51) extends downward to form a convex edge (52), and the convex edge (52) extends downward into the through hole (41) of the iron sheet (4); the convex edge (52) is located between the inner wall surface of the through hole (41) and the outer wall surface of the bushing (7).

8. A floating core assembly as claimed in claim 1, characterized in that: The long compression spring (8) is sleeved on the outer wall of the bushing (7), and a second step hole (91) is opened on the moving iron core (9); the top of the long compression spring (8) is in contact with the bottom of the convex edge (52), and the bottom of the long compression spring (8) and the bushing (7) extend downward into a large hole with a larger diameter at the top of the second step hole (91), and the bottom of the long compression spring (8) is in contact with the bottom of the large hole of the second step hole (91).

9. A floating core assembly as claimed in claim 1, characterized in that: An annular groove (12) is provided along the circumferential direction on the central axis (1) extending downwardly from the movable iron core (9), and a retaining spring (10) is arranged in the annular groove (12). The retaining spring (10) restricts the movable iron core (9) axially along the central axis (1).

10. A DC contactor, characterized in that: The floating core assembly comprises the floating core assembly according to any one of claims 1 to 9.

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