Armature mounting structure on direct current contactor

Abstract

The invention discloses a DC contactor upper armature installation structure, which comprises an armature support assembly used for fixedly installing an upper armature of a DC contactor on a magnetic pole piece, the armature support assembly comprises an armature support, an insulation connecting piece and a fixing pin, the upper armature is fixed on the armature support, the insulation connecting piece is fixed on the armature support, and the fixing pin is fixed on the insulation connecting piece. 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 invention, the three parts in the armature support assembly, namely the armature support, the insulating connecting piece and the fixing pin, are separately molded and then are fixedly assembled, so that the molding mode is relatively simple and easy to process, the manufacturing cost is reduced, the foreign matter risk caused by large-volume integral injection molding 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] This invention relates to the field of contactor technology, and in particular to an armature mounting structure for a DC contactor. Background Technology

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

[0003] Currently, setting up a short-circuit current protection structure in a DC contactor is one of the effective methods to solve the above-mentioned technical problems. The specific structure is as follows: an upper armature is fixed on the magnetic pole piece by an armature bracket, and a lower armature is installed on the moving contact. When the moving contact contacts the stationary contact and conducts current, the upper and lower armatures are magnetized under the action of the generated spiral magnetic field, so that the upper and lower armatures generate an attraction force between them and act on the moving contact, thereby providing an upward compensating force on the moving contact to overcome the electrodynamic repulsion force it receives.

[0004] In the above structure, the moving contact and lower armature are high-voltage ends, while the magnetic pole piece and lower armature are low-voltage ends. To avoid breakdown between the high and low voltage ends, existing technologies generally use an insulating support block integrally injection molded on the armature bracket. Although this can solve the problem of breakdown between the high and low voltage ends, the need to integrally injection mold the insulating support block on the metal results in complex injection molding processes, complex mold designs, high costs, and large injection molded parts. This also leads to a higher risk of foreign objects. Furthermore, if the parts deform during the injection molding process, they cannot be repaired and must be scrapped, increasing manufacturing costs. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide an armature mounting structure for a DC contactor, so as to overcome the technical problem of complex forming of existing armature mounting structures.

[0006] The technical solution adopted by the present invention to solve its technical problem is: an armature mounting structure for a DC contactor, comprising: an armature bracket assembly for fixing the upper armature of the DC contactor onto a magnetic pole piece, the armature bracket assembly comprising an armature bracket, an insulating connector and a fixing foot, the upper armature being fixed to the armature bracket, support plates being provided on both sides of the armature bracket, the support plates being fixedly connected to the fixing foot through the insulating connector, and the support plates and the fixing foot not contacting each other, the fixing foot being 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 fixed foot and the insulating connector, can be fixedly connected by any one of riveting, locking, or tight fitting.

[0008] As a further improvement of the present invention, the insulating connector is provided with a first slot and a second slot at both ends, the support plate is provided with a first pin at one end, the first pin is fixedly inserted into the first slot, and the fixed pin is provided with a second pin at one end, 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 locking protrusions. The first pin is press-fitted with the inner wall of the first slot through the locking protrusions thereon, and the second pin is press-fitted with the inner wall of the second slot through the locking protrusions thereon.

[0010] As a further improvement of the present invention, the first slot and the second slot are perpendicularly distributed; correspondingly, the first pin and the second pin are also perpendicularly 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 plug, and when the first plug is fully inserted into the first slot, the first limiting step abuts against one end face of the insulating connector; the fixing foot is provided with a second limiting step at the bottom of the second plug, and when the second plug 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 fixing foot is provided with a horizontally distributed fixing section and a plug-in section that is bent vertically upward relative to the fixing section. The fixing section is fixedly connected to the magnetic pole piece by any one of riveting, locking, or tight fitting. 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 extends integrally downward from the bottom of the first slot with a supporting step, the supporting step abutting against the top surface of the fixing 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. The four support plates are distributed in a rectangular shape. The number of insulating connectors and the fixing feet are the same as the number of support plates and are fixedly connected in a one-to-one correspondence.

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

[0016] The beneficial effects of this invention are as follows: This invention provides an armature mounting structure for a DC contactor. By separately molding the three parts of the armature bracket assembly—the armature bracket, the insulating connector, and the fixing foot—and then assembling them, the molding method is relatively simple, easy to process, and has a small size, reducing the risk of foreign objects caused by large-volume one-piece injection molding. The insulating connector isolates the armature bracket and the fixing foot from each other, achieving high and low voltage isolation and ensuring the safety of the DC contactor. At the same time, the two metal parts, the armature bracket and the fixing foot, can be shaped before assembly to meet technical requirements, avoiding the direct scrapping of parts due to deformation in existing one-piece injection molding, thus reducing manufacturing costs. Attached Figure Description

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

[0018] Figure 2 This is a cross-sectional view of the armature support assembly and the upper armature in Embodiment 1 of the present invention;

[0019] Figure 3 This is an exploded view of the armature support assembly and the upper armature in Embodiment 1 of the present invention;

[0020] Figure 4 This is a perspective view of the armature support in Embodiment 1 of the present invention;

[0021] Figure 5 This is a perspective view of the insulating connector in Embodiment 1 of the present invention;

[0022] Figure 6 This is a perspective view of the insulating connector in Embodiment 1 of the present invention from another angle;

[0023] Figure 7 This is a perspective view of the fixing foot in Embodiment 1 of the present invention;

[0024] Figure 8 This is a perspective view of the armature support assembly and the upper armature in Embodiment 2 of the present invention;

[0025] Figure 9 This is a perspective view of the insulating connector in Embodiment 2 of the present invention;

[0026] Figure 10 This is a perspective view of the insulating connector in Embodiment 2 of the present invention from another angle.

[0027] Referring to the accompanying drawings, the following explanations are provided:

[0028] 1. Upper armature; 2. Magnetic pole piece; 3. Armature support assembly; 31. Armature support; 311. Support plate; 3111. First pin; 3112. First limiting step; 312. Top plate; 32. Insulating connector; 321. First slot; 322. Second slot; 323. Supporting step; 33. Fixing foot; 331. Second pin; 3311. Locking protrusion; 332. Second limiting step; 333. Fixing section. Detailed Implementation

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

[0030] Example 1

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

[0032] Both the armature bracket 31 and the fixing foot 33 are made of metal.

[0033] In this invention, the armature bracket 31 has an inverted U-shaped structure, which has a top plate 312 and support plates 311 connected to both sides of the top plate 312. The top plate 312 is arranged in a horizontal direction, and the support plates 311 on both sides are arranged in a 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. The fixing method includes, but is not limited to, riveting, locking (such as using bolts), and tight fitting. In this embodiment, the riveting method is specifically used. Specifically, the top of the upper armature 1 is provided with two protruding posts, and the top plate 312 is provided with through holes that are adapted to them. The protruding posts pass through the through holes and are fixed by press riveting at the part protruding from the top plate 312.

[0035] Furthermore, the support plate 311 is fixedly connected to the fixed foot 33 by 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 by the armature bracket 31.

[0036] This invention involves separately molding the three parts of the armature support assembly 3—the armature support 31, the insulating connector 32, and the fixing foot 33—and then assembling them together. This process is simple and easy to manufacture. The insulating connector 32 isolates the armature support 31 and the fixing foot 33 from each other, achieving high and low voltage isolation and ensuring the safety of the DC contactor. Furthermore, the two metal parts, the armature support 31 and the fixing foot 33, can be pre-shaped to meet technical requirements before assembly, avoiding the direct scrapping of parts due to deformation caused by existing one-piece injection molding, thus reducing manufacturing costs.

[0037] In this embodiment, the insulating connector 32 is integrally injection molded from plastic material. Its molding method is simple, the injection mold design is not complicated, the manufacturing cost is reduced, and its small size reduces the risk of foreign objects caused by integral injection molding of a larger volume.

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

[0039] In this invention, the support plate 311 and the insulating connector 32, as well as the fixed foot 33 and the insulating connector 32, can be fixedly connected by any of the following methods: 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 an integrally formed first pin 3111, which is fixedly inserted into the first slot 321. The upper end of the fixing foot 33 has an integrally formed second pin 331, which is fixedly inserted into the second slot 322.

[0041] In this invention, both the first pin 3111 and the second pin 331 are provided with locking protrusions 3311. The first pin 3111 is press-fitted with the inner wall of the first slot 321 through the locking protrusions 3311, and the second pin 331 is press-fitted with the inner wall of the second slot 322 through the locking protrusions 3311. By providing locking protrusions 3311 on both the first pin 3111 and the second pin 331, this invention can further enhance the tightness of the fit between the armature bracket 31 and the fixing foot 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 not limited to two. The size of the latching protrusion 3311 near the end is slightly smaller so that the first pin 3111 and the second pin 331 can be inserted into the corresponding first slot 321 and second slot 322.

[0043] It is worth mentioning that the first slot 321 and the second slot 322 on the insulating connector 32 are perpendicularly distributed; correspondingly, the first pin 3111 and the second pin 331 are also perpendicularly distributed. By adopting this structural design, the present invention can easily press the first pin 3111 on the armature bracket 31 and the second pin 331 on the fixing foot 33 into the corresponding first slot 321 and second slot 322, respectively, reducing the difficulty of manufacturing process.

[0044] In addition, both the first slot 321 and the second slot 322 are provided with raised ribs along their respective slot depth directions to increase the tightness of the fit with the first pin 3111 and the second pin 331, and to further prevent them from falling off.

[0045] like Figure 4 As shown, the support plate 311 has a first limiting step 3112 at the 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 the corresponding end face of the insulating connector 32 to limit the consistency of the insertion depth of the first pin 3111 into the first slot 321 and ensure the consistent height of the insulating connector 32.

[0046] like Figure 7 As shown, the fixing foot 33 is provided with a second limiting step 332 at the bottom of the second plug 331. When the second plug 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 to limit the consistency of the insertion depth of the second plug 331 into the second slot 322 and ensure that the height of the fixing foot 33 is consistent.

[0047] The present invention provides a first limiting step 3112 on the support plate 311 and a second limiting step 332 on the fixed foot 33, which can ensure the accuracy of the assembly of the armature bracket 31 and the fixed foot 33 with the insulating connector 32 and prevent uneven feet.

[0048] Continue reading Figure 7 The fixing foot 33 has 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 foot 331 and the second limiting step 332 are both provided on the plug-in section. In this invention, the fixing section 333 can be fixedly connected to the magnetic pole piece 2 by any of the following methods: riveting, locking (such as using bolts), or tight fitting. In this embodiment, riveting is specifically used. Specifically, the top of the magnetic pole piece 2 is provided with a protrusion, and the fixing section 333 is provided with a matching mounting hole. The protrusion passes through the mounting hole and is fixed by riveting at the part 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. The four support plates 311 are arranged in a rectangular shape. The number of insulating connectors 32 and fixing feet 33 are the same as the number of support plates 311 and are fixedly connected in a one-to-one correspondence.

[0050] Example 2

[0051] The difference between this embodiment and Embodiment 1 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 Embodiment 1, this staggered distribution design 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 making it more conducive to the miniaturization design of DC contactor products.

[0053] In addition, the insulating connector 32 extends integrally downward from the bottom of the first slot 321 with a support step 323, which 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] Therefore, the armature mounting structure of the DC contactor of the present invention is simple to form by separately molding the three parts of the armature bracket assembly 3, namely the armature bracket 31, the insulating connector 32 and the fixing foot 33, and then fixing them together. This molding method is easy to process and has a small size, which reduces the risk of foreign objects caused by the large volume of one-piece injection molding. The insulating connector 32 isolates the armature bracket 31 and the fixing foot 33 from each other, which can achieve high and low voltage isolation and ensure the safety of the DC contactor. At the same time, the two metal parts, the armature bracket 31 and the fixing foot 33, can be shaped before assembly to meet the technical requirements before assembly, avoiding the direct scrapping of parts due to deformation in the existing one-piece injection molding, and reducing manufacturing costs.

[0055] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

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

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

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

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

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

6. The armature mounting structure of the DC contactor 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 pin (3111). When the first pin (3111) is fully inserted into the first slot (321), the first limiting step (3112) abuts against the corresponding end face of the insulating connector (32). The fixing foot (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 face of the insulating connector (32).

7. The armature mounting structure of the DC contactor 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 that is bent vertically upward relative to the fixing section (333). The fixing section (333) is fixedly connected to the magnetic pole piece (2) by any one of riveting, locking, or tight fitting. The second plug (331) is provided on the plug-in section.

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

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

10. The armature mounting structure of the DC contactor 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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