Armature mounting structure on direct current contactor

Abstract

The utility model discloses an upper armature installation structure of a direct current contactor, which comprises an armature support assembly used for fixedly installing an upper armature of the direct current contactor on a magnetic pole piece, the armature support assembly comprises an armature support, an insulation connecting piece and a fixing foot, the upper armature is fixed on the armature support, and the insulation connecting piece is fixed on the armature support. Supporting plates are arranged on the two sides of the armature support, the supporting plates are fixedly connected to the fixing feet through the insulating connecting pieces, the supporting plates and the fixing feet do not make contact with each other, and the fixing feet are fixed to the magnetic pole pieces. According to the utility model, the three parts in the armature bracket assembly, namely the armature bracket, the insulating connecting piece and the fixed pin, are respectively and independently formed and then are fixedly assembled, so that the forming mode is relatively simple and easy to process, the manufacturing cost is reduced, the foreign matter risk caused by integral injection molding with a relatively large volume is reduced, and the product quality is improved. The armature support and the fixing foot are separated from each other through the insulation connecting piece, and high-voltage and low-voltage isolation can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to an armature mounting structure of a DC contactor. Background Art

[0002] When a large current flows between the contacts of a DC contactor, especially when a short-circuit current passes through, an electric repulsion force will be generated between the moving contact and the static contact. When the electric repulsion force is greater than the supporting force of the moving contact, the moving contact will be repelled, generating a strong arc, causing the DC contactor to stick or even explode.

[0003] At present, setting up a short-circuit current resistant structure in a DC contactor is one of the effective methods to solve the above technical problems. The specific structure is: an upper armature is fixed on the magnetic pole piece through an armature bracket, and a lower armature is installed on the moving contact. When the moving contact contacts the static contact and the current flows through, the upper armature and the lower armature can be magnetized under the action of the spiral magnetic field, so that the upper armature and the lower armature generate mutual attraction and act on the moving contact, thereby exerting an upward compensation force on the moving contact to overcome the electric repulsion it is subjected to.

[0004] In the above structure, the moving contact piece and the lower armature belong to the high-voltage end, and the pole piece and the lower armature belong to the low-voltage end. In order to avoid the breakdown of the high and low voltage ends, the existing technology generally adopts an insulating support block that is integrally injection-molded on the armature bracket. Although it can solve the problem of breakdown of the high and low voltage ends, since it requires the insulating support block to be integrally injection-molded on the metal, the injection molding process is often complicated, the mold design is complex, the cost is high, the volume of the injection molded parts is large, and the risk of foreign matter is high. Once the parts are deformed during the injection molding process, they cannot be repaired and are directly scrapped, which increases the manufacturing cost. Utility Model Content

[0005] The problem to be solved by the utility model is to provide an upper armature mounting structure of a DC contactor, so as to overcome the technical problem of complex molding of the existing upper armature mounting structure.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a DC contactor upper armature mounting structure, comprising: an armature bracket assembly for fixedly mounting the upper armature of the DC contactor on a magnetic pole piece, the armature bracket assembly comprising an armature bracket, an insulating connector and a fixed foot, the upper armature is fixed to the armature bracket, support plates are provided on both sides of the armature bracket, the support plates are fixedly connected to the fixed feet through the insulating connector, and the support plates and the fixed feet do not contact each other, and the fixed feet are fixed to the magnetic pole piece.

[0007] As a further improvement of the present invention, the support plate and the insulating connector, as well as the fixing foot and the insulating connector, can be fixedly connected by riveting, locking, or tight fitting.

[0008] As a further improvement of the present invention, a first slot and a second slot are respectively provided at both ends of the insulating connector, a first pin is provided at one end of the support plate, the first pin is fixedly inserted into the first slot, and a second pin is provided at one end of the fixed pin, the second pin is fixedly inserted into the second slot.

[0009] As a further improvement of the present invention, both the first pin and the second pin are provided with a locking protrusion, and the first pin is interference-fitted with the inner wall of the first slot through the locking protrusion thereon, and the second pin is interference-fitted with the inner wall of the second slot through the locking protrusion thereon.

[0010] As a further improvement of the present invention, the first slot and the second slot are vertically distributed; correspondingly, the first pin and the second pin are also vertically distributed.

[0011] As a further improvement of the present invention, the support plate is provided with a first limiting step at the top of the first pin, and when the first pin is fully inserted into the first slot, the first limiting step abuts against the corresponding end face of the insulating connector; the fixed foot is provided with a second limiting step at the bottom of the second pin, and when the second pin is fully inserted into the second slot, the second limiting step abuts against the other end face of the insulating connector.

[0012] As a further improvement of the present invention, the fixed foot is provided with a horizontally distributed fixed section and a plug-in section bent vertically upward compared to the fixed section. The fixed section is fixedly connected to the magnetic pole piece by any one of riveting, locking, and tight fitting, and the second plug is provided on the plug-in section.

[0013] As a further improvement of the present invention, the first slot and the second slot are staggered in the horizontal direction, and the insulating connector has a support step extending downward from the bottom of the first slot, and the support step rests on the top surface of the fixed section.

[0014] As a further improvement of the present invention, the armature bracket is also provided with a top plate, and two support plates are fixedly connected to both sides of the top plate, and the four support plates are distributed in a rectangular shape. The insulating connectors and the fixed feet are the same in number as the support plates and are fixedly connected one by one.

[0015] As a further improvement of the present invention, the insulating connector is integrally injection-molded using a plastic material.

[0016] The beneficial effects of the utility model are as follows: the utility model provides an armature mounting structure for a DC contactor, which forms the three parts of the armature bracket assembly, namely the armature bracket, the insulating connector and the fixed leg, separately and then performs fixed assembly. This molding method is relatively simple, easy to process, and has a small volume, which reduces the risk of foreign matter caused by large-volume one-piece injection molding. The armature bracket and the fixed leg are isolated from each other by the insulating connector, which can achieve high and low voltage isolation and ensure the safety of the DC contactor. At the same time, the two metal parts of the armature bracket and the fixed leg can be shaped before assembly and assembled after meeting the technical requirements, avoiding the direct scrapping of parts caused by deformation in the existing one-piece injection molding, thereby reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a perspective view of a first embodiment of the armature mounting structure of a DC contactor according to the present invention;

[0018] Figure 2 A cross-sectional view of the armature bracket assembly and the upper armature in Example 1 of the present utility model;

[0019] Figure 3 This is an exploded view of the armature bracket assembly and the upper armature in Example 1 of the present utility model;

[0020] Figure 4 A three-dimensional diagram of the armature bracket in the first embodiment of the present invention;

[0021] Figure 5 This is a three-dimensional diagram of the insulating connector in Example 1 of the present utility model;

[0022] Figure 6 This is a three-dimensional view of the insulating connector in the first embodiment of the present invention from another perspective;

[0023] Figure 7 A three-dimensional diagram of the fixed foot in the first embodiment of the present invention;

[0024] Figure 8 A three-dimensional diagram of the armature bracket assembly and the upper armature in the second embodiment of the present invention;

[0025] Figure 9 This is a three-dimensional diagram of the insulating connector in the second embodiment of the present invention;

[0026] Figure 10 This is a three-dimensional view of the insulating connector in the second embodiment of the present invention from another perspective.

[0027] The following description is made with reference to the accompanying drawings:

[0028] 1. Upper armature; 2. Pole piece; 3. Armature bracket assembly; 31. Armature bracket; 311. Support plate; 3111. First pin; 3112. First limiting step; 312. Top plate; 32. Insulating connector; 321. First slot; 322. Second slot; 323. Support step; 33. Fixing foot; 331. Second pin; 3311. Boss; 332. Second limiting step; 333. Fixing section. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Example 1

[0031] See Figures 1 to 7 The utility model provides an upper armature mounting structure of a DC contactor, including an armature bracket assembly 3 for fixing an upper armature 1 of a DC contactor on a magnetic pole piece 2, wherein the armature bracket assembly 3 includes an armature bracket 31, an insulating connector 32 and a fixing foot 33.

[0032] The armature bracket 31 and the fixing leg 33 are both made of metal.

[0033] In the present invention, the armature bracket 31 is an inverted U-shaped structure, which is provided with a top plate 312 and support plates 311 connected to both sides of the top plate 312. The top plate 312 is arranged in the horizontal direction, and the support plates 311 on both sides thereof are arranged in the vertical direction. The armature bracket 31 can be obtained by stamping and bending a sheet metal part.

[0034] The upper armature 1 is fixed to the bottom of the top plate 312 of the armature bracket 31. Methods of fixing include, but are not limited to, riveting, locking (e.g., using bolts), and tight fitting. This embodiment employs riveting. Specifically, two bosses are provided on the top of the upper armature 1. The top plate 312 has through-holes adapted thereto. The bosses pass through the through-holes and are secured to the portion protruding from the top plate 312 by pressure riveting.

[0035] Furthermore, the support plate 311 is fixedly connected to the fixed foot 33 through the insulating connector 32, and the support plate 311 and the fixed foot 33 do not contact each other. The fixed foot 33 is fixed on the magnetic pole piece 2, so that the upper armature 1 is fixedly mounted on the magnetic pole piece 2 through the armature bracket 31.

[0036] The utility model forms the three parts of the armature bracket assembly 3, namely the armature bracket 31, the insulating connector 32 and the fixed leg 33, separately and then fixes and assembles them. The forming is simple and easy to process. The insulating connector 32 is used to isolate the armature bracket 31 and the fixed leg 33 from each other, thereby achieving high and low voltage isolation and ensuring the safety of the DC contactor. At the same time, the two metal parts of the armature bracket 31 and the fixed leg 33 can be shaped before assembly to meet technical requirements before assembly, thereby avoiding the direct scrapping of parts caused by deformation in existing one-piece injection molding, thereby reducing manufacturing costs.

[0037] In this embodiment, the insulating connector 32 is made of plastic material and is integrally injection molded. The molding method is simple, the injection mold design is not complicated, and the manufacturing cost is reduced. In addition, the volume is small, which reduces the risk of foreign matter caused by larger volume integral injection molding.

[0038] In other embodiments of the present invention, the insulating connector 32 may also be made of ceramic material.

[0039] In the present invention, the support plate 311 and the insulating connector 32 as well as the fixing foot 33 and the insulating connector 32 can be fixedly connected by riveting, locking (such as using bolts), or tight fitting.

[0040] Specifically, see Figures 2 to 7 The insulating connector 32 has a first slot 321 and a second slot 322 at its upper and lower ends, respectively. The lower end of the support plate 311 has a first pin 3111 integrally formed thereon, which is fixedly inserted into the first slot 321. The upper end of the fixing leg 33 has a second pin 331 integrally formed thereon, which is fixedly inserted into the second slot 322.

[0041] The first pin 3111 and the second pin 331 are both provided with a latching protrusion 3311. The first pin 3111, through its latching protrusion 3311, is tightly fitted with the inner wall of the first slot 321. The second pin 331, through its latching protrusion 3311, is tightly fitted with the inner wall of the second slot 322. By providing the latching protrusion 3311 on both the first pin 3111 and the second pin 331, the present invention further strengthens the tight fit between the armature bracket 31, the fixing leg 33, and the insulating connector 32, preventing them from falling off.

[0042] The present invention does not limit the shape of the latching protrusion 3311. In this embodiment, the latching protrusion 3311 is specifically tooth-shaped, and two latching protrusions 3311 are symmetrically provided on both sides of the first pin 3111 and both sides of the second pin 331, but are not limited to two. The size of the latching protrusion 3311 near the end is slightly smaller to facilitate the first pin 3111 and the second pin 331 to be inserted into the corresponding first slot 321 and the second slot 322.

[0043] It's worth noting that the first slot 321 and second slot 322 on the insulating connector 32 are arranged perpendicularly; correspondingly, the first pin 3111 and second pin 331 are also arranged perpendicularly. This structural design facilitates the insertion of the first pin 3111 on the armature bracket 31 and the second pin 331 on the fixing leg 33 into the corresponding first slot 321 and second slot 322, respectively, reducing manufacturing complexity.

[0044] In addition, ribs are provided in the first slot 321 and the second slot 322 along the depth direction of each slot, so as to increase the tight fit with the first pin 3111 and the second pin 331 and further prevent them from falling off.

[0045] like Figure 4 As shown, the support plate 311 is provided with a first limiting step 3112 on top of the first pin 3111. When the first pin 3111 is fully inserted into the first slot 321, the first limiting step 3112 abuts against a corresponding end surface of the insulating connector 32, limiting the insertion depth of the first pin 3111 into the first slot 321 and ensuring a consistent height of the insulating connector 32.

[0046] like Figure 7 As shown, the fixing leg 33 is provided with a second limiting step 332 at the bottom of the second pin 331. When the second pin 331 is fully inserted into the second slot 322, the second limiting step 332 abuts against the other end surface of the insulating connector 32, limiting the insertion depth of the second pin 331 into the second slot 322 and ensuring a consistent height of the fixing leg 33.

[0047] The utility model can ensure the assembly accuracy of the armature bracket 31 and the fixing foot 33 with the insulating connector 32 by providing a first limiting step 3112 on the support plate 311 and a second limiting step 332 on the fixing foot 33, thereby preventing the occurrence of uneven feet.

[0048] Continue reading Figure 7 The fixing foot 33 includes a horizontally distributed fixing section 333 and a plug-in section that is bent vertically upward relative to the fixing section 333. The second plug-in section 331 and the second limiting step 332 are both provided on the plug-in section. In the present invention, the fixing section 333 can be fixedly connected to the magnetic pole piece 2 by any of riveting, locking (such as using bolts), or tight fitting. This embodiment specifically uses riveting. Specifically, the top of the magnetic pole piece 2 is provided with a protruding bulge, and the fixing section 333 is provided with an assembly hole that matches the protruding bulge. The protruding bulge passes through the assembly hole and is fixed by pressure riveting at the portion protruding from the fixing section 333.

[0049] like Figure 3As shown, in this embodiment, two support plates 311 are fixedly connected to both sides of the top plate 312, and the four support plates 311 are distributed in a rectangular shape. The insulating connectors 32 and the fixing feet 33 are the same as the number of the support plates 311 and are fixedly connected one by one.

[0050] Example 2

[0051] The difference between this embodiment and the first embodiment is that the structure of the insulating connector 32 is different.

[0052] Specifically, see Figures 8 to 10 The first slot 321 and the second slot 322 on the insulating connector 32 are staggered in the horizontal direction. Compared with the first embodiment, this staggered arrangement of the first slot 321 and the second slot 322 can effectively reduce the thickness of the insulating connector 32, thereby reducing the height of the entire armature support assembly 3, saving space and further facilitating the miniaturization of the DC contactor product.

[0053] In addition, the insulating connector 32 has a support step 323 extending downward from the bottom of the first slot 321 . The support step 323 abuts against the top surface of the fixing section 333 to increase the overall structural strength of the armature bracket assembly 3 and make its support more reliable.

[0054] It can be seen that the armature mounting structure of the DC contactor of the present invention is achieved by separately molding the three parts of the armature bracket assembly 3, namely the armature bracket 31, the insulating connector 32 and the fixed leg 33, and then fixing and assembling them. This molding method is relatively simple, easy to process, and has a small volume, which reduces the risk of foreign matter caused by large-volume one-piece injection molding. The armature bracket 31 and the fixed leg 33 are isolated from each other by the insulating connector 32, which can achieve high and low voltage isolation and ensure the safety of the DC contactor. At the same time, the two metal parts of the armature bracket 31 and the fixed leg 33 can be shaped before assembly and assembled after meeting the technical requirements, avoiding the direct scrapping of parts caused by deformation of the existing one-piece injection molding, thereby reducing manufacturing costs.

[0055] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person skilled in the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A DC contactor upper armature mounting structure, comprising an armature bracket assembly (3) for fixing an upper armature (1) of the DC contactor on a magnetic pole piece (2), characterized in that: The armature bracket assembly (3) comprises an armature bracket (31), an insulating connector (32) and a fixed leg (33); the upper armature (1) is fixed to the armature bracket (31); support plates (311) are provided on both sides of the armature bracket (31); the support plates (311) are fixedly connected to the fixed leg (33) via the insulating connector (32); the support plates (311) and the fixed leg (33) do not contact each other; and the fixed leg (33) is fixed to the magnetic pole piece (2).

2. The DC contactor upper armature mounting structure according to claim 1, characterized in that: The support plate (311) and the insulating connector (32), as well as the fixing foot (33) and the insulating connector (32), can be fixedly connected by any one of riveting, locking, and tight fitting.

3. The DC contactor upper armature mounting structure according to claim 1, characterized in that: The insulating connector (32) is provided with a first slot (321) and a second slot (322) at both ends, respectively; one end of the support plate (311) is provided with a first plug pin (3111), and the first plug pin (3111) is fixedly plugged into the first slot (321); one end of the fixed pin (33) is provided with a second plug pin (331), and the second plug pin (331) is fixedly plugged into the second slot (322).

4. The DC contactor upper armature mounting structure according to claim 3, characterized in that: The first plug pin (3111) and the second plug pin (331) are both provided with a locking protrusion (3311), and the first plug pin (3111) is tightly fitted with the inner wall of the first slot (321) through the locking protrusion (3311) thereon, and the second plug pin (331) is tightly fitted with the inner wall of the second slot (322) through the locking protrusion (3311) thereon.

5. The DC contactor upper armature mounting structure according to claim 3, characterized in that: The first slot (321) and the second slot (322) are vertically distributed; correspondingly, the first plug pin (3111) and the second plug pin (331) are also vertically distributed.

6. The DC contactor upper armature mounting structure according to claim 3, characterized in that: The support plate (311) is provided with a first limiting step (3112) at the top of the first plug pin (3111). When the first plug pin (3111) is fully inserted into the first slot (321), the first limiting step (3112) abuts against one end face corresponding to the insulating connector (32); the fixed leg (33) is provided with a second limiting step (332) at the bottom of the second plug pin (331). When the second plug pin (331) is fully inserted into the second slot (322), the second limiting step (332) abuts against the other end face of the insulating connector (32).

7. The DC contactor upper armature mounting structure according to claim 3, characterized in that: The fixing foot (33) is provided with a horizontally distributed fixing section (333) and a plug-in section bent vertically upward compared to the fixing section (333); the fixing section (333) is fixedly connected to the magnetic pole piece (2) by any one of riveting, locking, and tight fitting; and the second plug pin (331) is provided on the plug-in section.

8. The DC contactor upper armature mounting structure according to claim 7, characterized in that: The first slot (321) and the second slot (322) are staggered in the horizontal direction, and the insulating connector (32) is integrally provided with a support step (323) extending downward from the bottom of the first slot (321), and the support step (323) abuts against the top surface of the fixing section (333).

9. The DC contactor upper armature mounting structure according to claim 1, characterized in that: The armature bracket (31) is further provided with a top plate (312), and two support plates (311) are fixedly connected to both sides of the top plate (312), and the four support plates (311) are distributed in a rectangular shape. The insulating connectors (32) and the fixing legs (33) are the same in number as the support plates (311) and are fixedly connected in a one-to-one correspondence.

10. The DC contactor upper armature mounting structure according to claim 1, characterized in that: The insulating connector (32) is made of plastic material and is integrally injection-molded.

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