High voltage dc sealed contactor

Abstract

The application relates to a high-voltage direct-current sealed contactor, which comprises an outer shell, a static contact and a dynamic spring sheet, the static contact and the dynamic spring sheet are oppositely arranged, the static contact is arranged above the dynamic spring sheet, the dynamic spring sheet is arranged below the static contact, an insulating cover and an inner frame are arranged in the outer shell, the insulating cover is arranged above the inner frame, a contact chamber is arranged below the inner frame, the dynamic spring sheet is arranged in the contact chamber, the static contact penetrates through the insulating cover and the inner frame, so that the lower end static contact point of the static contact is also arranged in the contact chamber, and a sealing ring is fixedly arranged between the insulating cover and the inner frame on the circumferential side of the static contact. The arc-extinguishing space in the contact chamber and the metal parts outside the contact chamber are isolated, the evaporation of the dynamic spring sheet under the life test or long-term use cannot splash into the chamber outside the contact chamber, and the insulation performance of the product is improved.

Description

Technical Field

[0001] This invention relates to contactor manufacturing technology, and more specifically to the sealing structure of the contact chamber of a high-voltage DC sealed contactor. Background Technology

[0002] A contactor is an automated control electrical device that uses a coil to generate a magnetic field, causing contacts to close and thus controlling a load. A current-driven high-voltage DC sealed contactor includes a contact chamber housing the moving spring and stationary contact, an insulating cover and a yoke cylinder surrounding this contact chamber, and a contactor housing further surrounding the insulating cover and yoke cylinder, forming a multi-layered sealing structure. In this type of high-voltage DC sealed contactor, the sealing performance of the contact chamber is particularly important. For example, after life testing or long-term use, if the contact chamber is not well-sealed, vapors from the moving spring can easily overflow and splash into the inner cavity of the contactor housing. Since the inner cavity of the contactor housing contains many metal parts, contact between these metal parts and the vapors from the moving spring can easily lead to insulation failure. Summary of the Invention

[0003] Therefore, in order to address the above problems, this invention proposes a structurally optimized high-voltage DC sealed contactor.

[0004] This invention is achieved using the following technical solution:

[0005] This invention proposes a high-voltage DC sealed contactor, comprising a housing, a stationary contact, and a moving spring. The stationary contact and the moving spring are arranged opposite to each other. If the stationary contact is positioned above the moving spring, then the moving spring is positioned below the stationary contact. The device also includes an insulating cover and an inner frame installed inside the housing. The insulating cover covers the inner frame, and a contact chamber is provided below the inner frame. The moving spring is located in the contact chamber. The stationary contact passes through the insulating cover and the inner frame so that its lower stationary contact point is also located in the contact chamber. A sealing ring is fixedly provided around the stationary contact, between the insulating cover and the inner frame.

[0006] In one embodiment, a first convex lip is fixedly provided at the edge of the upper end of the inner frame, surrounding the stationary contact. A second convex lip is provided on the inner side of the first convex lip, surrounding the first convex lip and located on the inner side. The first convex lip and the second convex lip form a mounting groove for installing the sealing ring.

[0007] In one embodiment, the first convex lip has an "O" shape and the second convex lip has a "C" shape, so that the mounting groove between them also has a "C" shape.

[0008] In one embodiment, the sealing ring extends above the mounting groove.

[0009] In one embodiment, the insulating cover includes a cover top located directly above the inner frame and a cover tube extending downward from the edge of the cover top. The cover tube surrounds the outer periphery of the inner frame. The outer end of the sealing ring installed in the mounting groove is located at the edge of the upper end of the inner frame and is clamped between the first convex lip and the cover tube.

[0010] In one embodiment, the sealing ring is interference-fitted into the gap between the top of the cover and the inner frame.

[0011] In one embodiment, both the outer and inner ends of the first convex lip are provided with arc-shaped segments that are partially convex outward.

[0012] In one embodiment, the first convex lip and the sealing ring are flat shapes with uneven radial dimensions to increase the maximum radial dimension of the mounting groove, and the inner frame is used to form the outer wall of the contact chamber flush with the outer wall of the mounting groove.

[0013] In one embodiment, the sealing ring has a square cross-section, and the mounting groove is a square groove.

[0014] In one embodiment, an insulating base is installed inside the housing, and the inner frame and the insulating base are joined in the vertical direction to form the contact chamber.

[0015] The present invention has the following beneficial effects: A sealing ring is fixedly provided on the periphery of the stationary contact, between the insulating cover and the inner frame. The upper and lower ends of the sealing ring abut against the insulating cover and the inner frame respectively to form a seal, thereby forming a sealed connection at the joint of the insulating cover and the inner frame, improving the sealing performance of the contact chamber, and isolating the arc-extinguishing space inside the contact chamber from the metal parts outside the contact chamber. This ensures that the vapors generated by the moving spring during life testing or long-term use will not splash into the cavity outside the contact chamber, thus improving the insulation performance of the product. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the high-voltage DC sealed contactor in the embodiment (the housing is not shown);

[0017] Figure 2 This is a cross-sectional view of the high-voltage DC sealed contactor in the embodiment (the housing is not shown);

[0018] Figure 3 yes Figure 2 A magnified view of a section at point M;

[0019] Figure 4This is a schematic diagram of the assembly of the inner frame and the sealing ring in the embodiment;

[0020] Figure 5 This is a three-dimensional schematic diagram of the inner frame in the embodiment;

[0021] Figure 6 This is a side view of the inner frame in the embodiment;

[0022] Figure 7 This is a three-dimensional schematic diagram of the sealing ring in the embodiment. Detailed Implementation

[0023] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0025] See Figure 1-3 As shown, in a preferred embodiment of the present invention, a high-voltage DC sealed contactor is provided, including a stationary contact 3 and a moving spring 2 for realizing the connection or disconnection of the contactor circuit. The stationary contact 3 and the moving spring 2 are arranged opposite to each other. For ease of description, this embodiment defines the stationary contact 3 as being arranged above the moving spring 2, and the moving spring 2 as being arranged below the stationary contact 3. The contactor includes a yoke cylinder 1 and an insulating cover 4 (the insulating cover 4 is generally made of ceramic material). The insulating cover 4 and the yoke cylinder 1 are arranged vertically opposite each other and welded together by a frame piece 10 to form a receiving cavity. Outside the yoke cylinder 1 and the insulating cover 4, there is also a contactor housing (not shown in the figure). The insulating cover 4 and the yoke cylinder 1 have another contact chamber for accommodating the moving spring 2 and the stationary contact 3 stationary contact point. This contact chamber also serves as an arc-extinguishing chamber. Specifically, an inner frame 6 (usually a plastic frame) and an insulating base 5 are fixedly installed in the insulating cover 4 and the yoke cylinder 1. The inner frame 6 and the insulating base 5 are joined in the vertical direction to form a contact chamber 9. The insulating cover 4 is placed on top of the inner frame 6. The moving spring 2 is located in the contact chamber 9. The stationary contact 3 passes through the insulating cover 4 and the inner frame 6 from top to bottom so that the lower stationary contact point of the stationary contact 3 is also located in the contact chamber 9.

[0026] Specifically, a sealing ring 7 is fixedly provided on the periphery of the stationary contact 3, between the insulating cover 4 and the inner frame 6. The upper and lower ends of the sealing ring 7 abut against the insulating cover 4 and the inner frame 6 respectively to form a seal, thereby forming a sealed connection at the joint of the insulating cover 4 and the inner frame 6, improving the sealing performance of the contact chamber 9, and ensuring that the vapors generated by the moving spring 2 during life testing or long-term use will not splash into the cavity outside the contact chamber 9. See details. Figure 4 , 5 A first convex lip 61, annularly surrounding the stationary contact 3, is fixedly provided at the upper edge of the inner frame 6. A second convex lip 62, partially surrounding the first convex lip 61, is provided inside the first convex lip 61. A mounting groove 8 for installing the sealing ring 7 is formed between the first convex lip 61 and the second convex lip 62. In this embodiment, the first convex lip 61 has a continuous, closed "O"-shaped structure, and the second convex lip 62 has a "C"-shaped structure, thus the mounting groove 8 between them is also "C"-shaped. (See also...) Figure 1 , 3 The insulating cover 4 includes a cover top 41 located directly above the inner frame 6 and a cover cylinder 42 extending downward from the edge of the cover top 41. The cover cylinder 42 surrounds the outer periphery of the inner frame 6. The inner part of the sealing ring 7 installed in the mounting groove is clamped between the first convex lip 61 and the second convex lip 62. The sealing ring 7 is interference-fitted in the gap between the cover top 41 and the inner frame 6, filling the gap between the cover top 41 and the mounting groove 8. The outer end of the sealing ring 7 is located at the upper edge of the inner frame 6 and is clamped between the first convex lip 61 and the cover cylinder 42. This arrangement can ensure the tightness and reliability of the connection between the sealing ring 7 and the insulating cover 4 and the inner frame 6, and the mounting groove can also serve to position and install the sealing ring 7.

[0027] In this embodiment, the radial dimension of the first convex lip 61 is non-uniform; the first convex lip 61 is a flat shape similar to a rectangle or ellipse. This elongates the maximum radial dimension of the mounting groove 8. The sealing ring 7 is also a flat shape, rather than a conventional annular shape with a uniform radial dimension, to fit the shape of the mounting groove 8. Figure 6 The outer wall of the cavity wall 63 of the inner frame 6 body, which forms the contact chamber 9, is designed to be flush with the outer wall 81 of the mounting groove 8. This allows the cavity wall 63 of the inner frame 6 body to provide some support when the sealing ring 7 is pressed down by the insulating cover 4, preventing the inner frame 6 from cracking under pressure. In this embodiment, the first convex lip 61 is made flat, which elongates the maximum radial dimension of the mounting groove 8, thus expanding the inner cavity space of the inner frame 6 body and increasing the arc-extinguishing space. Furthermore, as... Figure 3 , 7 In this embodiment, the sealing ring 7 has a square cross-section instead of the conventional circular sealing ring. This type of sealing ring 7 is less prone to rebound and can fit more tightly in the mounting groove 8, improving the sealing performance and thus maximizing the arc extinguishing space.

[0028] In this embodiment, the sealing ring 7 protrudes above the mounting groove 8, allowing it to be compressed downwards by the insulating cover 4, thereby improving the sealing performance.

[0029] like Figure 5 The outer and inner ends of the first convex lip 61 are respectively provided with arc-shaped segments 611 and 612 that are partially convex to form a partial clearance structure for components (such as contactor coil lead-out ends) that protrude through the inner frame 6, so as to avoid occupying the assembly space of other components.

[0030] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail made to the invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the protection scope of the invention.

Claims

1. A high-voltage DC sealed contactor, comprising a housing, a stationary contact, and a moving spring, wherein the stationary contact and the moving spring are arranged opposite to each other, and the stationary contact is positioned above the moving spring, and the moving spring is positioned below the stationary contact, characterized in that: It also includes an insulating cover and an inner frame installed inside the housing. The insulating cover covers the inner frame, and a contact chamber is provided below the inner frame. The moving spring is disposed in the contact chamber, and the stationary contact passes through the insulating cover and the inner frame so that the lower stationary contact point of the stationary contact is also disposed in the contact chamber. A sealing ring is fixedly provided on the periphery of the stationary contact between the insulating cover and the inner frame. A first convex lip is fixedly provided at the edge of the upper end of the inner frame, surrounding the stationary contact. A second convex lip is provided on the inner side of the first convex lip, surrounding the first convex lip and located on the inner side of the first convex lip. The first convex lip and the second convex lip form a mounting groove for installing the sealing ring. The first convex lip and the sealing ring are flat shapes with uneven radial dimensions to increase the maximum radial dimension of the mounting groove.

2. The high-voltage DC sealed contactor according to claim 1, characterized in that: The first convex lip has an "O" shape, and the second convex lip has a "C" shape, so the mounting groove between the first convex lip and the second convex lip also has a "C" shape.

3. The high-voltage DC sealed contactor according to claim 1, characterized in that: The sealing ring extends above the mounting groove.

4. The high-voltage DC sealed contactor according to claim 1, characterized in that: The insulating cover includes a cover top located directly above the inner frame and a cover tube extending downward from the edge of the cover top. The cover tube surrounds the outer periphery of the inner frame. The outer end of the sealing ring installed in the mounting groove is located at the edge of the upper end of the inner frame and is clamped between the first convex lip and the cover tube.

5. The high-voltage DC sealed contactor according to claim 4, characterized in that: The sealing ring is interference-fitted in the gap between the top of the cover and the inner frame.

6. The high-voltage DC sealed contactor according to claim 1, characterized in that: The outer and inner sides of the first convex lip are provided with arc-shaped segments that are partially convex.

7. The high-voltage DC sealed contactor according to claim 1, characterized in that: The insulating cover is made of ceramic, and the inner frame is used to form the outer wall of the contact chamber flush with the outer wall of the mounting groove.

8. The high-voltage DC sealed contactor according to claim 1, characterized in that: The sealing ring has a square cross-section, and the mounting groove is a square groove.

9. The high-voltage DC sealed contactor according to claim 1, characterized in that: It also includes an insulating base installed inside the housing, wherein the inner frame and the insulating base are joined in the vertical direction to form the contact chamber.

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