Ceramic cover for direct current contactor

Abstract

A ceramic cover for a direct current contactor comprises a cover body, and two through holes used for installing static contacts are symmetrically formed in the upper end face of the cover body. A first arc-shaped partition plate and a second arc-shaped partition plate are symmetrically arranged on the left side wall and the right side wall of an inner cavity of the cover body respectively, a first auxiliary contact cavity is defined between the first arc-shaped partition plate and the inner wall of the cover body, and a second auxiliary contact cavity is defined between the second arc-shaped partition plate and the inner wall of the cover body. A first auxiliary contact hole and a second auxiliary contact hole are respectively formed in the upper end surface of the cover body; the first auxiliary contact hole and the second auxiliary contact hole are respectively communicated with the first auxiliary contact cavity and the second auxiliary contact cavity; a first guide groove hole is vertically formed in the middle of the first arc-shaped partition plate, and a second guide groove hole is vertically formed in the middle of the second arc-shaped partition plate. According to the utility model, the defects in the prior art are overcome, the auxiliary contact can be effectively isolated, the arc extinguishing performance of an electric arc can be effectively improved, and the ablation of the electric arc to the contact is reduced.

Description

Technical Field

[0001] This utility model relates to the field of DC contactor technology, specifically to a ceramic cover for a DC contactor. Background Technology

[0002] A DC contactor typically consists of an iron core, coil, armature, and contact springs. When a certain voltage is applied across the coil, a current flows through it, generating an electromagnetic effect. The armature, attracted by this electromagnetic force, overcomes the tension of the return spring and is drawn towards the iron core, causing the moving contact to engage with the stationary contact. When the coil is de-energized, the electromagnetic attraction disappears, and the armature returns to its original position under the spring's reaction force, disengaging the moving contact from the stationary contact. This engagement and disengagement process achieves the purpose of connecting and disconnecting circuits.

[0003] However, DC contactors on the market are divided into two main categories: one with auxiliary contacts and the other without auxiliary contacts. In applications such as charging piles and energy storage in the new energy industry, DC contactors with auxiliary contacts are required. Through the auxiliary contacts, operators can determine whether the main contacts of the DC contactor are closed or open, thereby improving the safety of operators during operation.

[0004] Currently, the ceramic covers of the contact cavities in existing DC contactors typically employ a square or circular cavity structure. While this structure is simple, it lacks internal partitions, thus failing to effectively isolate electromagnetic interference and easily leading to creepage, affecting contact stability. Some designs use partitions to isolate the contacts, but these partition structures usually occupy significant space, limiting the contact cavity's space. This results in a narrow and elongated arc-extinguishing channel, limiting the arc-extinguishing space and preventing the arc ring from fully opening, leading to poor arc-extinguishing performance and ultimately impacting the overall performance and reliability of the DC contactor. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a ceramic cover for DC contactors, which overcomes the deficiencies of existing technologies. It is reasonably designed and can effectively isolate auxiliary contacts while also effectively improving the arc extinguishing performance and reducing the erosion of contacts by the arc.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A ceramic cover for a DC contactor includes a cover body with two symmetrical through holes for mounting stationary contacts on its upper end face. A first arc-shaped partition and a second arc-shaped partition are symmetrically arranged on the left and right side walls of the inner cavity of the cover body, respectively. A first auxiliary contact cavity is formed between the first arc-shaped partition and the inner wall of the cover body, and a second auxiliary contact cavity is formed between the second arc-shaped partition and the inner wall of the cover body. A first auxiliary contact hole and a second auxiliary contact hole are respectively opened on the upper end face of the cover body, and the first and second auxiliary contact holes are respectively connected to the first and second auxiliary contact cavities. A first guide slot is vertically opened in the middle of the first arc-shaped partition, and a second guide slot is vertically opened in the middle of the second arc-shaped partition.

[0008] Preferably, both the front and rear outer sides of the cover are provided with placement grooves for placing magnets.

[0009] Preferably, the upper surface of the cover is provided with a reinforcing groove, which is located between two through holes.

[0010] Preferably, a baffle is provided at the top of the inner cavity of the cover, the baffle is located between two through holes, and the line connecting the baffle and the two through holes is perpendicular to each other.

[0011] This invention provides a ceramic cover for a DC contactor, which has the following advantages: By using a first arc-shaped partition and a second arc-shaped partition, the inner cavity of the cover is divided into two independent auxiliary contact cavities, namely a first auxiliary contact cavity and a second auxiliary contact cavity, effectively isolating the auxiliary contacts and preventing interference from electric arcs generated by the contacts within the inner cavity of the cover, thus ensuring stable operation of the auxiliary contacts. Simultaneously, by setting both the first and second arc-shaped partitions as arc-shaped structures, the auxiliary contacts are effectively isolated, and the arc-shaped structure guides airflow, optimizing heat dissipation. Furthermore, it optimizes the utilization of the internal space of the cover, resulting in a larger contact cavity space inside the cover, which in turn allows for greater arc stretching space, effectively improving arc extinguishing performance, reducing arc erosion of the contacts, and extending the service life of the equipment. 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 Structural diagram of this utility model Figure 1 ;

[0014] Figure 2 Structural diagram of this utility model Figure 2 ;

[0015] Explanation of the labels in the diagram:

[0016] 1. Cover; 2. Through hole; 3. First arc-shaped partition; 4. Second arc-shaped partition; 5. First auxiliary contact cavity; 6. Second auxiliary contact cavity; 7. First auxiliary contact hole; 8. First auxiliary contact hole; 9. First guide groove hole; 10. Second guide groove hole; 11. Placement groove opening; 12. Reinforcing groove; 13. Baffle strip. 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 1-2 As shown, a ceramic cover for a DC contactor includes a cover body 1. Two through holes 2 for mounting stationary contacts are symmetrically opened on the front and back of the upper end face of the cover body 1. A first arc-shaped partition 3 and a second arc-shaped partition 4 are symmetrically arranged on the left and right side walls of the inner cavity of the cover body 1, respectively. A first auxiliary contact cavity 5 is formed between the first arc-shaped partition 3 and the inner wall of the cover body 1, and a second auxiliary contact cavity 6 is formed between the second arc-shaped partition 4 and the inner wall of the cover body 1. A first auxiliary contact hole 7 and a second auxiliary contact hole 8 are respectively opened on the upper end face of the cover body 1, and the first auxiliary contact hole 7 and the second auxiliary contact hole 8 are respectively connected to the first auxiliary contact cavity 5 and the second auxiliary contact cavity 6. A first guide slot 9 is vertically opened in the middle of the first arc-shaped partition 3, and a second guide slot 10 is vertically opened in the middle of the second arc-shaped partition 4.

[0019] Working principle:

[0020] In this embodiment, by symmetrically arranging a first arc-shaped partition 3 and a second arc-shaped partition 4 on the left and right side walls of the inner cavity of the cover 1, the inner cavity of the cover 1 is divided into two independent auxiliary contact cavities, namely the first auxiliary contact cavity 5 and the second auxiliary contact cavity 6. Thus, in actual use, the first arc-shaped partition 3 and the second arc-shaped partition 4 can effectively isolate the auxiliary contacts, preventing interference from the electric arc generated by the contacts within the inner cavity of the cover 1, and ensuring stable operation of the auxiliary contacts. Simultaneously, in this embodiment, by setting both the first arc-shaped partition 3 and the second arc-shaped partition 4 as arc-shaped structures, the auxiliary contacts can be effectively isolated, and the airflow can be guided through the arc structure to optimize heat dissipation. Furthermore, the internal space utilization of the cover 1 can be optimized, resulting in a larger contact cavity space within the cover 1, which in turn allows for greater arc stretching space, effectively improving arc extinguishing performance, reducing arc erosion of the contacts, and extending the service life of the equipment.

[0021] By setting the first guide slot 9 and the second guide slot 10, the guiding and positioning effect of the auxiliary contact can be achieved, ensuring that the reliability of the auxiliary contact is improved.

[0022] In Example 2, as a further preferred embodiment of Example 1, both the front and rear outer surfaces of the cover 1 are provided with placement grooves 11, which are used to place magnets. By providing placement grooves 11 on the front and rear outer surfaces of the cover 1, and embedding magnets in the placement grooves 11, the magnetic field generated by the magnets can effectively attract electric arcs, further suppressing arc propagation and improving arc extinguishing efficiency.

[0023] In embodiment three, as a further preferred embodiment one, a reinforcing groove 12 is provided on the upper surface of the cover 1, and the reinforcing groove 12 is located between two through holes 2. The reinforcing groove 12 effectively improves the structural strength of the cover 1, prevents deformation caused by high temperature or external force, and ensures the stability and safety of the equipment during long-term operation.

[0024] In Example 4, as a further preferred embodiment of Example 1, a baffle 13 is provided at the top of the inner cavity of the cover 1. The baffle 13 is located between the two through holes 2, and the lines connecting the baffle 13 and the two through holes 2 are perpendicular to each other. By separating the two through holes 2 through the baffle 13, effective isolation can be achieved between the two stationary contacts, preventing the arc from jumping between the stationary contacts, further improving the arc extinguishing effect, and ensuring the safety of equipment operation.

[0025] 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. A ceramic cover for a DC contactor, comprising a cover body (1), wherein the upper end face of the cover body (1) has two through holes (2) symmetrically formed for mounting stationary contacts; characterized in that: The left and right side walls of the inner cavity of the cover (1) are symmetrically provided with a first arc-shaped partition (3) and a second arc-shaped partition (4). The first arc-shaped partition (3) and the inner wall of the cover (1) form a first auxiliary contact cavity (5), and the second arc-shaped partition (4) and the inner wall of the cover (1) form a second auxiliary contact cavity (6). The upper surface of the cover (1) is provided with a first auxiliary contact hole (7) and a second auxiliary contact hole (8). The first auxiliary contact hole (7) and the second auxiliary contact hole (8) are respectively connected to the first auxiliary contact cavity (5) and the second auxiliary contact cavity (6). The first arc-shaped partition (3) is vertically provided with a first guide slot (9) in the middle, and the second arc-shaped partition (4) is vertically provided with a second guide slot (10) in the middle.

2. The ceramic cover for a DC contactor according to claim 1, characterized in that: The front and rear outer sides of the cover (1) are provided with placement grooves (11), which are used to place magnets.

3. A ceramic cover for a DC contactor according to claim 1, characterized in that: The upper surface of the cover (1) is provided with a reinforcing groove (12), which is located between two through holes (2).

4. A ceramic cover for a DC contactor according to claim 1, characterized in that: A baffle (13) is provided at the top of the inner cavity of the cover (1). The baffle (13) is located between two through holes (2), and the line connecting the baffle (13) and the two through holes (2) is perpendicular to each other.

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