A screwable O-ring bidirectional seal structure

Abstract

The utility model relates to a kind of rotatable O type bidirectional sealing structure, for the sealing connection of the cylinder cover and cylinder of packaging container, the inside of the cylinder cover is provided with internal thread, the end of the cylinder is provided with external thread, the cylinder cover is connected with cylinder by internal thread and external thread, the sealing end surface of the cylinder is equipped with annular groove for accommodating O type sealing ring, the bottom of the cylinder cover is equipped with L type sealing compression part, the L type sealing compression part includes radial sealing wall and axial sealing wall, the radial sealing wall and axial sealing wall are connected perpendicularly, the radial sealing wall extrudes O type sealing ring and generates radial compression deformation;The axial sealing wall extrudes O type sealing ring and generates axial compression deformation.The utility model effectively protects chassis rust layer, significantly reduces operating risk, and has the advantages of stable and reliable support.

Description

Technical Field

[0001] This utility model relates to the field of packaging container technology, and in particular to a screw-on O-ring bidirectional sealing structure. Background Technology

[0002] The sealing performance of military packaging containers is a core tactical technical indicator for ensuring the storage, transportation, and battlefield applicability of ammunition. In the context of information warfare, high-precision guided munitions place even more stringent demands on packaging protection: they must utilize efficient sealing structures to isolate the internal and external physical environments (such as moisture, salt spray, dust, etc.) and prevent the contents from deteriorating due to environmental corrosion. To isolate the contents from the internal and external physical environments, the sealing performance of the packaging container is a crucial technical support point. Currently, mainstream sealing solutions include gasket seals, sealing strip seals, and O-ring seals, all of which essentially rely on the principle of compression static sealing. Among these, O-ring seals are widely used due to their simple structure and low cost, but they suffer from the following technical bottlenecks:

[0003] 1. Existing O-ring sealing structures generally adopt two types of structures: end face radial compression sealing or axial compression sealing. Their sealing performance is highly dependent on the dimensional accuracy and surface roughness of the mating parts. Because the dimensional accuracy of injection molded parts is difficult to maintain as high as that of machined metal parts, it is difficult to design according to the design criteria when calculating the compression amount of plastic parts. Often, after the actual assembly is completed, the sealing effect is not ideal, resulting in insufficient compression leading to leakage, or excessive compression leading to plastic deformation or stress relaxation of the O-ring, resulting in loss of rebound sealing ability.

[0004] 2. During the injection molding and cooling process, plastic parts are affected by ambient temperature and humidity, material batch differences, and mold wear. The dimensions of key sealing parts, such as groove depth and flatness of gland mating surfaces, exhibit significant batch fluctuations. This fluctuation is directly transmitted to the compression of O-ring seals, resulting in discrete sealing performance. Under the same design, the pass rate of different batches of products fluctuates drastically, making it difficult to meet the quality consistency requirements of large-scale production of military equipment.

[0005] The aforementioned problems have led to systemic defects in the existing O-ring sealing structure in the field of military packaging, such as low reliability, uncontrollable lifespan, and unstable yield. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the technical problem to be solved by this patent application is how to provide a screwable O-ring bidirectional sealing structure that effectively protects the chassis anti-rust layer, significantly reduces operational risks, and provides stable and reliable support.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A screw-on O-ring bidirectional sealing structure is used for sealing the cap and body of a packaging container. The cap has an internal thread on its inner side, and the end of the body has an external thread. The cap and body are connected via the internal and external threads. Its characteristic is that...

[0009] The sealing end face of the cylinder is provided with an annular groove for accommodating the O-ring seal. The bottom of the cylinder cover is provided with an L-shaped sealing compression part, which includes a radial sealing wall and an axial sealing wall. The radial sealing wall and the axial sealing wall are vertically connected. The radial sealing wall compresses the O-ring seal to produce radial compression deformation; the axial sealing wall compresses the O-ring seal to produce axial compression deformation.

[0010] In this way, through the orthogonal double-wall structure of the L-shaped sealing compression part, radial and axial compound compression are simultaneously triggered during a single stroke of thread tightening, causing the O-ring to form an L-shaped continuous sealing interface under mutually perpendicular mechanical constraints. Compared with the traditional unidirectional compression structure, this design increases the sealing contact area by more than 40% (radial + axial contact surface superposition), significantly reducing the risk of local seal failure caused by dimensional fluctuations in plastic parts. The measured sealing reliability is improved from 70% of the conventional structure to ≥95%.

[0011] As an optimization, the cylinder cover and the L-shaped sealing and pressing part are integrally formed.

[0012] In this way, the integral molding of the cylinder cover and the L-shaped sealing pressure part eliminates the accumulation of assembly errors in the split structure, which is convenient for manufacturing.

[0013] As an optimization, the length of the radial sealing wall of the L-shaped sealing compression part is greater than the depth of the annular groove, and the radial sealing wall of the L-shaped sealing compression part is located on the outside of the cylinder.

[0014] In this way, the length of the radial sealing wall is greater than the depth of the groove and extends to the side wall of the cylinder, forming an active compensation mechanism for radial compression: when the depth of the groove in the plastic cylinder becomes shallower due to process fluctuations, the extra-long sealing wall can maintain the radial compression and prevent insufficient compression and leakage.

[0015] As an optimization, a limiting block is provided on the outer side of the cylinder, and the limiting block is provided with a limiting groove. The L-shaped sealing and pressing part is inserted and matched with the limiting groove.

[0016] In this way, the insertion and engagement of the cylinder limiting block and the L-shaped sealing pressing part achieves secondary locking after the threads are fully tightened, and can generate normal pressing force on the outside of the L-shaped sealing pressing part.

[0017] As an optimization, a guide surface is provided on the outer side of the end of the L-shaped sealing and pressing part.

[0018] In this way, the tapered guide surface at the end of the L-shaped sealing and pressing part automatically corrects the coaxiality deviation between the cylinder cover and the cylinder body during the initial stage of assembly. The guide surface facilitates rapid entry into the limiting groove.

[0019] In summary, this utility model has the following beneficial effects:

[0020] 1. By applying orthogonal bidirectional synchronous compression (radial + axial) to the O-ring through the L-shaped sealing compression part, an L-shaped continuous sealing interface is constructed, which increases the sealing contact area and solves the performance degradation problem caused by single-point seal failure in ammunition packaging.

[0021] 2. Relying on the bidirectional deformation redundancy design of the L-shaped sealing and pressing part, when the critical dimensions of the plastic part fluctuate (such as a groove depth deviation of ±0.15mm), the radial sealing wall elongation compensates for the radial compression loss; the axial sealing wall height adaptively fills the axial gap; thus achieving stable sealing and increasing the batch qualification rate from 70% in the traditional process to 95%.

[0022] 3. Eliminates the problem of repeated mold repairs caused by dimensional fluctuations, reduces the frequency of mold modifications, shortens the R&D cycle, and saves process development costs.

[0023] 4. This structure can reduce the compression ratio of the O-ring during the design phase, thereby reducing the later-stage sealing ring deformation and failure caused by passively increasing the O-ring compression to compensate for dimensional fluctuations. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a screw-on O-ring bidirectional sealing structure according to the present invention.

[0025] Figure 2 for Figure 1 A sectional view.

[0026] Figure 3 for Figure 2 A schematic diagram showing the state with the O-ring bidirectional seal structure removed.

[0027] Figure 4 for Figure 2 The front view.

[0028] Figure 5 for Figure 3 The front view.

[0029] Figure 6 for Figure 1 A schematic diagram of the split structure. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. In the description of the present invention, it should be understood that directional terms such as "upper," "lower," "top," and "bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] like Figure 1-6 As shown, a screw-on O-ring bidirectional sealing structure is used for sealing the cap 1 and the body 11 of a packaging container. The inner side of the cap is provided with an internal thread, and the end of the body is provided with an external thread. The cap and the body are connected by the internal and external threads. The sealing end face of the body is provided with an annular groove 12 for accommodating the O-ring 20. The bottom of the cap is provided with an L-shaped sealing compression part 13. The L-shaped sealing compression part includes a radial sealing wall 14 and an axial sealing wall 15. The radial sealing wall and the axial sealing wall are perpendicularly connected. The radial sealing wall compresses the O-ring to produce radial compression deformation, and the axial sealing wall compresses the O-ring to produce axial compression deformation.

[0032] In this way, through the orthogonal double-wall structure of the L-shaped sealing compression part, radial and axial compound compression are simultaneously triggered during a single stroke of thread tightening, causing the O-ring to form an L-shaped continuous sealing interface under mutually perpendicular mechanical constraints. Compared with the traditional unidirectional compression structure, this design increases the sealing contact area by more than 40% (radial + axial contact surface superposition), significantly reducing the risk of local seal failure caused by dimensional fluctuations in plastic parts. The measured sealing reliability is improved from 70% of the conventional structure to ≥95%.

[0033] In practice, the cylinder cover and the L-shaped sealing and pressing part are integrally formed.

[0034] In this way, the integral molding of the cylinder cover and the L-shaped sealing pressure part eliminates the accumulation of assembly errors in the split structure, which is convenient for manufacturing.

[0035] In practice, the length of the radial sealing wall of the L-shaped sealing compression part is greater than the depth of the annular groove, and the radial sealing wall of the L-shaped sealing compression part is located on the outside of the cylinder.

[0036] In this way, the length of the radial sealing wall is greater than the depth of the groove and extends to the side wall of the cylinder, forming an active compensation mechanism for radial compression: when the depth of the groove in the plastic cylinder becomes shallower due to process fluctuations, the extra-long sealing wall can maintain the radial compression and prevent insufficient compression and leakage.

[0037] During implementation, a limiting block 16 is provided on the outer side of the cylinder, and the limiting block is provided with a limiting groove 17. The L-shaped sealing pressing part is inserted and matched with the limiting groove.

[0038] In this way, the insertion and engagement of the cylinder limiting block and the L-shaped sealing pressing part achieves secondary locking after the threads are fully tightened, and can generate normal pressing force on the outside of the L-shaped sealing pressing part.

[0039] In practice, a guide surface 18 is provided on the outer side of the end of the L-shaped sealing and pressing part.

[0040] In this way, the tapered guide surface at the end of the L-shaped sealing and pressing part automatically corrects the coaxiality deviation between the cylinder cover and the cylinder body during the initial stage of assembly. The guide surface facilitates rapid entry into the limiting groove.

[0041] Finally, it should be noted that those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A screw-on O-ring bidirectional sealing structure for sealing the cap and body of a packaging container, wherein the cap has an internal thread on its inner side, and the end of the body has an external thread, and the cap and body are connected by the internal and external threads; characterized in that, The sealing end face of the cylinder is provided with an annular groove for accommodating the O-ring seal. The bottom of the cylinder cover is provided with an L-shaped sealing compression part, which includes a radial sealing wall and an axial sealing wall. The radial sealing wall and the axial sealing wall are vertically connected. The radial sealing wall compresses the O-ring seal to produce radial compression deformation; the axial sealing wall compresses the O-ring seal to produce axial compression deformation.

2. The screw-on O-ring bidirectional sealing structure according to claim 1, characterized in that, The cylinder cover and the L-shaped sealing and pressing part are integrally formed.

3. The screw-on O-ring bidirectional sealing structure according to claim 2, characterized in that, The length of the radial sealing wall of the L-shaped sealing compression part is greater than the depth of the annular groove, and the radial sealing wall of the L-shaped sealing compression part is located on the outside of the cylinder.

4. The screw-on O-ring bidirectional sealing structure according to claim 1, characterized in that, The outer side of the cylinder is provided with a limiting block, the limiting block is provided with a limiting groove, and the L-shaped sealing pressing part is inserted into the limiting groove.

5. The screw-on O-ring bidirectional sealing structure according to claim 1, characterized in that, A guide surface is provided on the outer side of the end of the L-shaped sealing and pressing part.

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