Leakage test expansion sealing structure

Abstract

The utility model discloses a leak test expansion sealing structure, which is characterized by comprising a sealing bottom plate, a nylon block, a pressing block and a top pressure column, the nylon block is fixedly arranged on the sealing bottom plate, the pressing block is arranged above the nylon block, the middle part of the nylon block is provided with a convex part which is in contact with a concave part in the middle part of the pressing block, and the top pressure column is arranged above the nylon block. A sealing ring is arranged on the outer side of the end face, making contact with the pressing block, of the periphery of the protruding part, and the top face of the pressing block is pressed by the jacking column, so that the protruding part of the nylon block expands transversely to extrude the sealing ring. The sealing device has the advantages that the nylon is pressed through external pressure, the nylon deforms outwards, the outer sealing ring is pressed, the sealing ring is tightly attached to the sealing side wall of a product, the sealing effect on the product is achieved, the sealing effect is good, and the structure is simple.

Description

Technical Field

[0001] The utility model relates to the field of airtightness detection jigs, and particularly relates to a leak detection expansion and sealing structure. Background Art

[0002] Due to the influence of die-casting process, shrinkage porosity and gas holes are likely to occur on existing aluminum alloy die-cast products. When the products are used as shells with high airtightness requirements, leak detection needs to be carried out on the aluminum alloy die-cast products. During leak detection, multiple holes on the products need to be blocked and sealed. The existing sealing jigs use stoppers moving vertically and horizontally to block the holes. However, for blocking holes with a large area, sealing rings need to be used. But the end faces of the blocked holes do not have planes for setting sealing rings. Therefore, a blocking structure for the inner wall surface of the holes needs to be designed. Summary of the Invention

[0003] Aiming at the above deficiencies in the prior art, the utility model provides a leak detection expansion and sealing structure, which has a simple structure and can seal and block the side walls of product holes.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A leak detection expansion and sealing structure, characterized in that: it includes a sealing bottom plate, a nylon block, a pressing block, and a top pressure column. The nylon block is fixedly arranged on the sealing bottom plate. The pressing block is arranged above the nylon block. A convex part is provided in the middle of the nylon block and contacts a concave part in the middle of the pressing block. A sealing ring is arranged on the outer periphery of the convex part and the outer side of the contact end face with the pressing block. The top pressure column presses the top surface of the pressing block, so that the convex part of the nylon block expands laterally to squeeze the sealing ring.

[0006] Further, a compression spring is arranged between the top surface of the nylon block and the pressing block. The pressing block is limited on the nylon block by screws, and the compression spring is sleeved outside the screws.

[0007] Further, both the pressing block and the nylon block are provided with arc-shaped limiting parts for limiting the sealing ring. The upper and lower ends of the sealing ring are provided with convex ribs, and both the pressing block and the nylon block are provided with embedding grooves corresponding to the convex ribs.

[0008] The beneficial effects of the utility model include: using external pressure to press the nylon, causing the nylon to deform outward, pressing the outer sealing ring, making the sealing ring tightly adhere to the side wall of the product for sealing, having a good sealing effect and a simple structure. Description of the Drawings

[0009] Figure 1 is a structural schematic diagram of the utility model;

[0010] Figure 2 is Figure 1 The sectional view taken along line A-A in

[0011] Figure 3 is Figure 1 The sectional view taken along line B-B in Detailed implementation manners

[0012] The present utility model will be further described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0013] A leak detection and expansion sealing structure as shown in Figures 1-3 includes a sealing bottom plate 1, a nylon block 2, a pressing block 3, and a pressing column 4. The nylon block 2 is fixedly arranged on the sealing bottom plate 1, and the nylon block 2 protrudes into the hole position on the product. The pressing block 3 is arranged above the nylon block 2. A convex portion 6 is provided in the middle of the nylon block 2 and contacts a concave portion in the middle of the pressing block 3. A sealing ring 5 is arranged on the outer side of the contact end face between the outer periphery of the convex portion 6 and the pressing block 3. The pressing column 4 presses the top surface of the pressing block 3, so that the convex portion 6 of the nylon block 2 expands laterally to squeeze the sealing ring 5, and at the same time, the sealing ring 5 is also pressed to laterally squeeze and contact the inner wall of the hole position to achieve sealing.

[0014] As shown in Figure 2 in order to reset the nylon block 2 and the sealing ring 5, a compression spring 7 is arranged between the top surface of the nylon block 2 and the pressing block 3. The pressing block 3 is limited on the nylon block 3 by a screw 8, and the compression spring 7 is sleeved outside the screw 8. When the pressing column 4 leaves the top surface of the pressing block 3, the compression spring 7 resets to lift the pressing block 3.

[0015] In order to make the sealing effect of the sealing ring better, both the pressing block 3 and the nylon block 2 are provided with arc-shaped limiting portions for limiting the sealing ring 5. Both the upper end and the lower end of the sealing ring 5 are provided with ribs, and both the pressing block 3 and the nylon block 2 are provided with grooves corresponding to the ribs.

[0016] The technical solutions provided by the embodiments of the present utility model have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the embodiments of the present utility model. The descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present utility model; at the same time, for those of ordinary skill in the art, according to the embodiments of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A leak detection and expansion tight sealing structure, characterized in that: It includes a sealed bottom plate (1), a nylon block (2), a pressing block (3), and a pressing column (4). Among them, the nylon block (2) is fixedly arranged on the sealed bottom plate (1), the pressing block (3) is arranged above the nylon block (2), a convex part (6) in the middle of the nylon block (2) contacts a concave part in the middle of the pressing block (3), a sealing ring (5) is arranged on the outside of the contact end face between the outer periphery of the convex part (6) and the pressing block (3), and the pressing column (4) presses the top surface of the pressing block (3) so that the convex part (6) of the nylon block (2) expands laterally to squeeze the sealing ring (5).

2. The leak detection expansion and tightening seal structure according to claim 1, wherein: A compression spring (7) is arranged between the top surface of the nylon block (2) and the pressing block (3). The pressing block (3) is limited on the nylon block (2) by a screw (8), and the compression spring (7) is sleeved outside the screw (8).

3. The leak detection and expansion tight sealing structure according to claim 1, characterized in that: Both the pressing block (3) and the nylon block (2) are provided with arc-shaped limiting parts for limiting the sealing ring (5). Both the upper end and the lower end of the sealing ring (5) are provided with convex ribs, and both the pressing block (3) and the nylon block (2) are provided with embedding grooves corresponding to the convex ribs.

Images