Electromagnetic outer shell for direct current contactor

Abstract

An electromagnetic outer shell for a direct current contactor comprises an outer shell, the outer shell is of a shell structure with an opening in the upper end, an upper end cover is installed at the opening in the upper end of the outer shell, an anti-explosion barrel is installed in the outer shell, an electromagnetic coil is arranged in the anti-explosion barrel, and an edge ring folded outwards is arranged on the upper end of the anti-explosion barrel along the periphery. An annular step is arranged on the inner side of the upper end of the outer shell, the edge ring is installed on the annular step, the edge position of the lower surface of the upper end cover is matched with the edge ring, an annular notch is formed in the side edge of the upper end cover, and a dispensing groove is defined by the annular notch and the side wall of the annular step. According to the utility model, the defects in the prior art are overcome, the overall strength of the outer shell can be effectively enhanced so as to effectively avoid deformation or fracture of the outer shell in an extreme environment, the stable operation of the internal electromagnetic coil can be ensured, and the magnetic field of the coil is prevented from leaking from the outer side.

Description

Technical Field

[0001] This utility model relates to the field of DC contactor technology, and specifically to an electromagnetic housing for a DC contactor. Background Technology

[0002] Contactors are important power control components used to control the starting and stopping of motors and the switching on and off of other electrical loads. They are widely used in industrial and agricultural electrification and automation, as well as other economic construction fields. Their usage is large, their operating time is long, and with the popularization and improvement of electrification and automation technologies, the demand for contactors is growing very rapidly. Existing DC contactors mainly consist of three parts: an electromagnetic mechanism, a contact system, and an arc-extinguishing device. The electromagnetic mechanism consists of an iron core, a coil, and a coil support.

[0003] In current technology, coils are usually directly sleeved outside the central sleeve of the coil support. However, the outer side of the coil is directly exposed and encapsulated inside the housing of the DC contactor. This structural design will generate magnetic leakage, which will reduce the electromagnetic field strength generated by the coil. In addition, the edge of the housing is not strong enough and is prone to deformation. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides an electromagnetic housing for a DC contactor, which overcomes the shortcomings of the prior art. It is reasonably designed and can effectively enhance the overall strength of the housing to avoid deformation or cracking of the housing in extreme environments. At the same time, it can ensure the stable operation of the internal electromagnetic coil and prevent the magnetic field of the coil from leaking out from the outside.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An electromagnetic housing for a DC contactor includes a housing that is open at the top. A top cover is installed at the top opening of the housing. An explosion-proof barrel is installed inside the housing, and an electromagnetic coil is disposed within the explosion-proof barrel. An outwardly folded edge ring is provided along the circumference of the upper end of the explosion-proof barrel. An annular step is provided on the inner side of the upper end of the housing, and the edge ring is mounted on the annular step. The edge of the lower surface of the top cover is adapted to the edge ring. An annular notch is provided on the side of the top cover, and the annular notch and the side wall of the annular step form a dispensing groove.

[0007] Preferably, the edge ring has a downwardly bent arc-shaped surface structure.

[0008] Preferably, the outer side of the edge ring is provided with a through hole, and the glue dispensing groove is connected to the gap between the explosion-proof barrel and the inner wall of the outer shell through the through hole.

[0009] Preferably, the inner wall of the annular step is provided with a positioning protrusion, and the outer edge of the upper cover is provided with a positioning groove that cooperates with the positioning protrusion.

[0010] Preferably, the explosion-proof barrel is made of metal.

[0011] This invention provides an electromagnetic housing for a DC contactor, offering the following advantages: The guiding effect of the edge ring at the top of the explosion-proof barrel allows epoxy resin to flow along the outer surface of the explosion-proof barrel into the gap between the explosion-proof barrel and the inner wall of the housing, thus achieving a tight fixation between the explosion-proof barrel and the housing. The fluidity of the epoxy resin ensures uniform gap filling, enhancing the overall sealing and stability of the structure. Furthermore, by designing the edge ring as an outward-folding arc-shaped structure, the edge ring can be completely embedded in the epoxy resin, effectively ensuring a tight bond between the edge ring of the explosion-proof barrel and the housing, preventing loosening due to vibration or temperature changes. The explosion-proof barrel effectively enhances the overall strength of the housing, preventing deformation or breakage in extreme environments, while also ensuring the stable operation of the internal electromagnetic coil and preventing the coil's magnetic field from leaking outwards. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of the prior art will be briefly introduced below.

[0013] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention;

[0014] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0015] Explanation of the labels in the diagram:

[0016] 1. Outer shell; 2. Top cover; 3. Explosion-proof barrel; 4. Edge ring; 5. Annular step; 6. Annular notch; 7. Glue groove; 8. Through hole. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0018] Example 1, as Figure 1-2As shown, an electromagnetic housing for a DC contactor includes a housing 1, which is an open-top shell structure. A top cover 2 is installed at the top opening of the housing 1. An explosion-proof barrel 3 is installed inside the housing 1, and an electromagnetic coil is disposed within the explosion-proof barrel 3. An outwardly folded edge ring 4 is provided along the circumference of the upper end of the explosion-proof barrel 3. An annular step 5 is provided on the inner side of the upper end of the housing 1, and the edge ring 4 is mounted on the annular step 5. The edge of the lower surface of the top cover 2 is fitted onto the edge ring 4. An annular notch 6 is provided on the side of the top cover 2, and the annular notch 6 and the side wall of the annular step 5 form a dispensing groove 7. Specifically, the explosion-proof barrel 3 is made of metal.

[0019] Working principle:

[0020] During installation, the edge ring 4 of the explosion-proof barrel 3 is aligned with the annular step 5 of the outer shell 1. Epoxy resin is injected into the annular notch 6 on the side of the upper cover 2, allowing the resin to enter the dispensing groove 7. Guided by the edge ring 4, the epoxy resin flows along the outer surface of the explosion-proof barrel 3 into the gap between the barrel 3 and the inner wall of the outer shell 1, achieving a tight fixation between the explosion-proof barrel and the outer shell. The fluidity of the epoxy resin ensures uniform gap filling, enhancing the overall sealing and stability of the structure. Furthermore, by designing the edge ring 4 as an outwardly folded arc-shaped structure, it is completely embedded in the epoxy resin, effectively ensuring a tight bond between the edge ring 4 of the explosion-proof barrel 3 and the outer shell 1, preventing loosening due to vibration or temperature changes. The explosion-proof barrel 3 can effectively enhance the overall strength of the outer shell 1, so as to effectively prevent the outer shell from deforming or breaking in extreme environments, while ensuring the stable operation of the internal electromagnetic coil and preventing the magnetic field of the coil from leaking out from the outside.

[0021] In Example 2, as a further preferred embodiment of Example 1, a through hole 8 is provided on the outer side of the edge ring 4. The dispensing groove 7 is connected to the gap between the explosion-proof barrel 3 and the inner wall of the outer shell 1 through the through hole 8. By providing multiple through holes 8 on the outer side of the edge ring 4, the epoxy resin adhesive, after entering the dispensing groove 7, can be evenly distributed to the gap between the explosion-proof barrel 3 and the outer shell 1 through the through holes 8, further ensuring dense filling of the adhesive and improving the overall pressure resistance and impact resistance of the structure. In addition, the design of the through holes 8 can effectively expel air bubbles, avoiding uneven adhesive distribution caused by air bubbles, and further improving the sealing effect.

[0022] In Example 3, as a further preferred embodiment of Example 1, a positioning protrusion is provided on the inner sidewall of the annular step 5, and a positioning groove that mates with the positioning protrusion is provided circumferentially on the outer edge of the upper cover 2. Through the engagement of the positioning protrusion and the positioning groove, precise positioning of the upper cover 2 and the outer shell 1 can be achieved, ensuring assembly accuracy.

[0023] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electromagnetic housing for a DC contactor, characterized in that: The device includes an outer shell (1), which is a shell structure with an open top. An upper cover (2) is installed at the upper opening of the outer shell (1). An explosion-proof barrel (3) is installed inside the outer shell (1). An electromagnetic coil is installed inside the explosion-proof barrel (3). An outwardly folded edge ring (4) is provided along the circumference of the upper end of the explosion-proof barrel (3). An annular step (5) is provided on the inner side of the upper end of the outer shell (1). The edge ring (4) is installed on the annular step (5). The edge position of the lower surface of the upper cover (2) is adapted to the edge ring (4). An annular notch (6) is provided on the side of the upper cover (2). The annular notch (6) and the side wall of the annular step (5) form a glue groove (7).

2. The electromagnetic housing for a DC contactor according to claim 1, characterized in that: The edge ring (4) has a downward-bent arc-shaped surface structure.

3. The electromagnetic housing for a DC contactor according to claim 1, characterized in that: The outer side of the edge ring (4) is provided with a through hole (8), and the glue dispensing groove (7) is connected to the gap between the explosion-proof barrel (3) and the inner wall of the outer shell (1) through the through hole (8).

4. An electromagnetic housing for a DC contactor according to claim 1, characterized in that: The inner wall of the annular step (5) is provided with a positioning protrusion, and the outer edge of the upper cover (2) is provided with a positioning groove that matches the positioning protrusion.

5. An electromagnetic housing for a DC contactor according to claim 1, characterized in that: The explosion-proof barrel (3) is made of metal.

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