A sealing structure

Abstract

The utility model relates to sealing technical field discloses a kind of sealing structure, including upper shell, lower shell, the lower end of upper shell is equipped with outer cylindrical surface, the upper end of outer cylindrical surface is equipped with annular baffle ring, outer cylindrical surface is equipped with at least sealing guide seat;The upper end of lower shell is equipped with inner cylindrical surface, and inner cylindrical surface is equipped with sealing seat, and the upper end edge of inner cylindrical surface is equipped with sealing ring;Sealing guide seat is equipped with guide surface, sealing surface, the transition surface of connecting guide surface and sealing surface, the distance of sealing surface to annular baffle ring is less than the distance of guide surface to annular baffle ring.The utility model has the beneficial effects of simple structure, convenient operation, sealing durable stable.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a sealing structure. Background Technology

[0002] Many biosensors contain organic or composite materials, which are susceptible to moisture absorption in high-humidity environments. For example, some polymer materials swell after absorbing excessive moisture. Taking electrochemical sensors as an example, if the polymer coating on the electrode surface expands, poor sealing can alter the electrode spacing and surface area. This change in electrode spacing affects the ion transport path and efficiency, interfering with electrical signal detection and reducing sensor sensitivity. Furthermore, high humidity can accelerate the chemical corrosion process of materials. In biosensors, metal electrodes or metal connections on the sensor chip may react chemically with water. For instance, copper electrodes are prone to oxidation in high humidity and the presence of oxygen, forming corrosion products such as copper oxide. These corrosion products coat the electrode surface, hindering electron transport, increasing electrode resistance, and weakening the sensor's response signal. Most existing implantable devices lack proper sealing or have poor sealing, leading to poor sensor performance, product instability, and an inability to guarantee consistent performance throughout the shelf life. Therefore, proper sealing of implantable devices is crucial for product performance. Utility Model Content

[0003] To address the aforementioned problems in the prior art, this invention provides a sealing structure that is simple in structure, easy to operate, and provides a durable and stable seal. It is particularly suitable for sealing sensors in implantable devices.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A sealing structure includes an upper shell and a lower shell. The lower end of the upper shell has an outer cylindrical surface, and the upper end of the outer cylindrical surface has an annular retaining ring. A sealing guide seat is provided on the outer cylindrical surface, distributed circumferentially and protruding outwards. The upper end of the lower shell has an inner cylindrical surface that fits with the outer cylindrical surface with a clearance. A sealing seat is provided on the inner cylindrical surface, protruding inwards, corresponding to the sealing guide seat. A sealing ring is provided at the upper edge of the inner cylindrical surface. The sealing guide seat has a guide surface, a sealing surface, and a transition surface connecting the guide surface and the sealing surface, distributed circumferentially along the outer cylindrical surface. The distance from the sealing surface to the annular retaining ring is less than the distance from the guide surface to the annular retaining ring. When the inner cylindrical surface and the outer cylindrical surface are circumferentially fitted together until the sealing ring abuts against the annular retaining ring, the sealing seat is located between the guide surface and the annular retaining ring. When the upper and lower shells rotate relative to each other, causing the sealing seat to enter the sealing surface along the guide surface and the transition surface, the sealing ring is compressed and deformed by the annular retaining ring to achieve a seal.

[0005] By adopting the above technical solution: when the upper and lower housings are fitted together, the axial position difference of the sealing seat on the guide surface and the sealing surface is used to achieve the compression seal between the sealing ring and the annular retaining ring. Furthermore, by precisely setting the height difference between the guide surface and the sealing surface, the compression deformation of the sealing ring is accurately controlled to ensure a stable seal between the sealing ring and the annular retaining ring, which is not prone to failure. This sealing connection method of the upper and lower housings can re-seal and connect stably even after repeated disassembly and separation, making it very convenient to use.

[0006] Preferably, a first limiting protrusion is provided at one end of the outer cylindrical surface near the guide surface, and a guide groove is formed between the first limiting protrusion and the sealing guide seat for the sealing seat to move in and out axially. The guide groove facilitates the sealing seat to enter the initial position of one end of the sealing guide seat axially, making the initial connection and positioning of the upper and lower housings more convenient.

[0007] Preferably, the distance from the first limiting protrusion to the lower edge of the outer cylindrical surface is less than the distance from the sealing guide seat to the lower edge of the outer cylindrical surface. The first limiting protrusion and the sealing guide seat are staggered, and the distance from the first limiting protrusion to the edge is smaller, which facilitates better alignment of the sealing seat with the guide groove and facilitates stable entry of the sealing seat into the guide groove.

[0008] Preferably, the lower end face of the sealing seat facing the transition surface has a chamfer. The chamfer can better adapt to the transition surface, making the sealing seat pass through the transition surface more smoothly and less prone to jamming.

[0009] Preferably, the upper end of the outer cylindrical surface near the sealing surface is provided with a bottom-touching upper limit block, and the sealing seat is provided with a bottom-touching lower limit block. When the sealing seat is fully inserted into the sealing surface, the bottom-touching lower limit block and the bottom-touching upper limit block abut and limit the movement. When the lower housing rotates to the point where it can no longer rotate, it indicates that the sealing seat is fully inserted into the sealing surface, preventing the lower housing from rotating excessively.

[0010] Preferably, the outer cylindrical surface has a positioning indicator rib at the end of the upper bottom-contact stop block near the sealing guide seat. The positioning indicator rib and the upper bottom-contact stop block form a limiting gap for limiting the lower bottom-contact stop block. When the lower bottom-contact stop block passes the positioning indicator rib, it enters the limiting gap and is limited. During the rotation of the lower housing, when the lower bottom-contact stop block passes the positioning indicator rib, the feel of the rotation changes, producing a sound. This serves two purposes: firstly, it informs the user that the lower housing has rotated to the correct position (rotated to the sealed state); secondly, the limiting gap limits the lower bottom-contact stop block and increases damping when the lower housing separates from the upper housing, preventing the lower housing from becoming loose or easily opened.

[0011] Preferably, both ends of the positioning indicator rib are provided with first guide slopes, and both ends of the bottom-touching limiting block are provided with second guide slopes adapted to the first guide slopes. When the bottom-touching limiting block enters the limiting gap, one end of the bottom-touching limiting block abuts against the bottom-touching upper limiting block, and the second guide slope on the bottom-touching limiting block abuts against the first guide slope. This arrangement reduces the resistance of the bottom-touching limiting block passing the positioning indicator rib, and completely limits the bottom-touching limiting block through the limiting gap, thereby preventing the lower shell from loosening.

[0012] Preferably, a second limiting protrusion is provided on the outer cylindrical surface above the first limiting protrusion. One end of the second limiting protrusion near the sealing guide seat is flush with the first limiting protrusion. The distance from the second limiting protrusion to the lower edge of the outer cylindrical surface is greater than the distance from the sealing guide seat to the lower edge of the outer cylindrical surface. A third limiting protrusion is provided on the sealing seat. When the sealing seat rotates along the guide surface until the third limiting protrusion abuts against the second limiting protrusion, the sealing seat is fully inserted into the guide groove. The blocking and limiting effect of the second limiting protrusion on the third limiting protrusion ensures that the sealing seat can stably enter the guide groove when the lower housing is rotated and separated, thus facilitating the disassembly and separation of the lower housing and the upper housing.

[0013] Preferably, the sealing ring is bonded to the lower housing by adhesive or injection molding.

[0014] Preferably, the sealing ring includes a sealing ring body and an annular sealing lip. The upper end face of the sealing ring body is flush with the upper end face of the lower housing. The annular sealing lip is disposed on the upper end face of the sealing ring body and is integrally formed with the sealing ring body. The annular sealing lip protrudes from the upper end face of the lower housing. The annular sealing lip deforms more easily when pressed against the annular retaining ring, thereby improving the sealing effect.

[0015] Therefore, this utility model has the advantages of simple structure, convenient operation, and long-lasting and stable sealing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 for Figure 1 Exploded view.

[0018] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0019] Figure 4 This is a front view of the upper shell.

[0020] Figure 5 This is a sectional view of the lower shell.

[0021] Figure 6 This is a partial cross-sectional view of the sealing seat entering the guide groove.

[0022] Figure 7 This is a schematic diagram showing the bottom limit block crossing the positioning indicator rib and entering the limit gap. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial technical effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the scope of protection of the present utility model.

[0024] It should be understood that the terms "first," "second," etc., used herein are for descriptive purposes only and should not be construed as indicating or implying relative importance, nor should they be construed as implicitly specifying the number of technical features indicated. Features specified as "first" or "second" may expressly or implicitly indicate that at least one of those features is included.

[0025] like Figures 1-5 The sealing structure shown includes an upper shell 1 and a lower shell 2. The lower end of the upper shell 1 is provided with an outer cylindrical surface 10, and the upper end of the outer cylindrical surface 10 is provided with an annular retaining ring 11. The outer cylindrical surface 10 is provided with sealing guide seats 12 that are distributed circumferentially and protrude outwards. The upper end of the lower shell 2 is provided with an inner cylindrical surface 20 that is clearance-fitted with the outer cylindrical surface 10. The inner cylindrical surface 20 is provided with a sealing seat 21 that protrudes inwardly corresponding to the sealing guide seat 12. A sealing ring 3 is provided at the upper edge of the inner cylindrical surface 20. The sealing guide seat 12 is provided with a guide surface 120, a sealing surface 122, and a transition surface 121 connecting the guide surface 120 and the sealing surface 122 that are distributed circumferentially along the outer cylindrical surface 10. The sealing surface 122 extends to the annular retaining ring 11. The distance between the retaining ring 11 and the guide surface 120 is less than the distance between the retaining ring 11 and the annular retaining ring 11. When the inner cylindrical surface 20 and the outer cylindrical surface 10 are circumferentially fitted together until the flexible sealing ring 3 abuts against the annular retaining ring 11, the sealing seat 21 is located between the guide surface 120 and the annular retaining ring 11. When the upper housing 1 and the lower housing 2 rotate relative to each other, causing the sealing seat 21 to enter the sealing surface 122 along the guide surface 120 and the transition surface 121, the sealing ring 3 is compressed and deformed by the annular retaining ring 11 to achieve sealing. In some embodiments, the outer cylindrical surface 10 is provided with two sets of sealing guide seats 12 that are evenly distributed circumferentially and protrude outwards to ensure that the sealing ring 3 is evenly compressed at various positions in the circumferential direction, the sealing is stable, and it is not easy to fail.

[0026] In some embodiments, the lower end face of the sealing seat 21 facing the transition surface 121 is provided with a chamfer 213. This makes the sealing seat 21 pass through the transition surface 121 more smoothly and less prone to jamming.

[0027] like Figure 5 As shown, the sealing ring 3 is bonded to the lower housing 2 by adhesive bonding or injection molding. The sealing ring 3 includes a sealing ring body 30 and an annular sealing lip 31. The upper end face of the sealing ring body 30 is flush with the upper end face of the lower housing 2. The annular sealing lip 31 is disposed on the upper end face of the sealing ring body 30 and is integrally formed with the sealing ring body 30. The annular sealing lip 31 protrudes from the upper end face of the lower housing 2. In some embodiments, the width of the annular sealing lip 31 is smaller than the width of the sealing ring body 30, so that the annular sealing lip 31 is less likely to extend beyond the sides of the sealing ring body when subjected to compression deformation.

[0028] like Figure 4 As shown, a first limiting protrusion 13 is provided at one end of the outer cylindrical surface 10 near the guide surface 120. A guide groove 130 for the sealing seat 21 to move in and out along the axial direction is formed between the first limiting protrusion 13 and the sealing guide seat 12. The distance from the first limiting protrusion 13 to the lower edge of the outer cylindrical surface 10 is less than the distance from the sealing guide seat 12 to the lower edge of the outer cylindrical surface 10.

[0029] A second limiting protrusion 16 is provided on the outer cylindrical surface 10 above the first limiting protrusion 13. One end of the second limiting protrusion 16 near the sealing guide seat 12 is flush with the first limiting protrusion 13. The distance from the second limiting protrusion 16 to the lower edge of the outer cylindrical surface 10 is greater than the distance from the sealing guide seat 12 to the lower edge of the outer cylindrical surface 10. A third limiting protrusion 212 is provided on the sealing seat 21. When the sealing seat 21 rotates along the guide surface 120 until the third limiting protrusion 212 abuts against the second limiting protrusion 16, the sealing seat 21 is completely inserted into the guide groove 130.

[0030] like Figure 3 and Figure 4 As shown, an upper limit stop block 14 is provided on the upper side of the end of the outer cylindrical surface 10 near the sealing surface 122, and a lower limit stop block 210 is provided on the sealing seat 21. When the sealing seat 21 is fully inserted into the sealing surface 122, the lower limit stop block 210 abuts against the upper limit stop block 14 and is limited. An arrival indicator rib 15 is provided on the outer cylindrical surface 10 at the end of the upper limit stop block 14 near the sealing guide seat 12. A limiting gap 150 is formed between the arrival indicator rib 15 and the upper limit stop block 14 for limiting the lower limit stop block 210. When the lower limit stop block 210 passes the arrival indicator rib 15, the lower limit stop block 210 enters the limiting gap 150 and is limited.

[0031] Both ends of the positioning indicator rib 15 are provided with a first guide slope 151, and both ends of the bottom limit block 210 are provided with a second guide slope 211 that matches the first guide slope 151. When the bottom limit block 210 enters the limiting gap 150, one end of the bottom limit block 210 abuts against the bottom upper limit block 14 for limiting, and the second guide slope 211 on the bottom limit block 210 abuts against the first guide slope 151.

[0032] In this embodiment, the sealing seat 21 and the lower housing 2 are configured as an integral structure; the sealing guide seat 12, the first limiting protrusion 13, the bottom-touching upper limit block 14, the positioning indicator rib 15, the second limiting protrusion 16 and the upper housing are configured as an integral structure.

[0033] Referring to the accompanying drawings, the method of using this utility model is as follows: The sensor is installed inside the upper housing 1 or the lower housing 2, and the sealing connection between the upper housing 1 and the lower housing 2 is as follows: Figure 6 As shown, the inner cylindrical surface 20 of the lower housing 2 is coaxially inserted with the outer cylindrical surface 10 of the upper housing 1. The sealing seat 21 enters the guide groove 130 (shown by the dotted line in the figure) axially. The sealing ring 3 moves to abut against the annular retaining ring 11 (the sealing ring 3 is not compressed). At this time, the lower side of the sealing seat 21 is flush with or slightly higher than the guide surface 120. Then the lower housing rotates clockwise, and the lower side of the sealing seat 21 moves along the guide surface 120. When the sealing seat passes the transition surface 121, the sealing ring 3 begins to be compressed. When the sealing seat 21 is fully inserted into the sealing surface 122, the sealing ring 3 is compressed to its maximum deformation. Figure 7 As shown, the lower housing 2 continues to rotate, causing the bottom limit block 210 to pass over the positioning indicator rib 15 and enter the limiting gap 150. At this time, the bottom limit block 210 is limited by the bottom limit block 14, and the upper housing 1 and the lower housing 2 are completely sealed together.

[0034] When it is necessary to separate the upper housing 1 from the lower housing 2, rotate the lower housing 2 counterclockwise so that the bottom limit block 210 passes the positioning indicator rib 15. The sealing seat 21 moves sequentially along the sealing surface 122, the transition surface 121, and the guide surface 120 until the third limiting protrusion 13 on the sealing seat 21 contacts the second limiting protrusion 16. At this time, the sealing seat 21 enters the guide groove 130, and finally the lower housing 2 is separated from the upper housing 1 along the axial direction.

[0035] In the description of this utility model, it should be understood that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, and the other end are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the purpose of more clearly describing the technical solution of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as a limitation of this utility model.

[0036] Although specific embodiments of the present invention are described in detail herein, they are given for illustrative purposes only and should not be construed as limiting the scope of the present invention. Various substitutions, alterations, and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A sealing structure comprising an upper housing (1) and a lower housing (2), characterized in that, The lower end of the upper housing (1) is provided with an outer cylindrical surface (10), the upper end of the outer cylindrical surface (10) is provided with an annular retaining ring (11), and the outer cylindrical surface (10) is provided with a sealing guide seat (12) that is distributed circumferentially and protrudes outward. The upper end of the lower housing (2) is provided with an inner cylindrical surface (20) that is in clearance fit with the outer cylindrical surface (10). The inner cylindrical surface (20) is provided with an inwardly protruding sealing seat (21) corresponding to the sealing guide seat (12). A sealing ring (3) is provided at the upper edge of the inner cylindrical surface (20). The sealing guide seat (12) is provided with a guide surface (120), a sealing surface (122), and a transition surface (121) connecting the guide surface (120) and the sealing surface (122) distributed circumferentially along the outer cylindrical surface (10). The distance from the sealing surface (122) to the annular retaining ring (11) is less than the distance from the guide surface (120) to the annular retaining ring (11). When the inner cylindrical surface (20) and the outer cylindrical surface (10) are circumferentially fitted together until the sealing ring (3) and the annular retaining ring (11) abut against each other, the sealing seat (21) is located between the guide surface (120) and the annular retaining ring (11); when the upper housing (1) and the lower housing (2) rotate relative to each other, causing the sealing seat (21) to enter the sealing surface (122) along the guide surface (120) and the transition surface (121), the sealing ring (3) is compressed and deformed by the annular retaining ring (11) to achieve sealing.

2. The sealing structure according to claim 1, characterized in that, A first limiting protrusion (13) is provided at one end of the outer cylindrical surface (10) near the guide surface (120). A guide groove (130) for the sealing seat (21) to move in and out axially is formed between the first limiting protrusion (13) and the sealing guide seat (12).

3. The sealing structure according to claim 2, characterized in that, The distance from the first limiting protrusion (13) to the lower edge of the outer cylindrical surface (10) is less than the distance from the sealing guide seat (12) to the lower edge of the outer cylindrical surface (10).

4. The sealing structure according to claim 1, characterized in that, The lower end face of the sealing seat (21) facing the transition surface (121) is provided with a chamfer (213).

5. A sealing structure according to claim 1 or 2, characterized in that, The outer cylindrical surface (10) is provided with a bottom-reaching upper limit block (14) on the upper side of the end near the sealing surface (122), and the sealing seat (21) is provided with a bottom-reaching lower limit block (210). When the sealing seat (21) is fully inserted into the sealing surface (122), the bottom-reaching lower limit block (210) and the bottom-reaching upper limit block (14) abut and limit each other.

6. A sealing structure according to claim 5, characterized in that, On the outer cylindrical surface (10), at one end of the upper limit block (14) near the sealing guide seat (12), there is a positioning indicator rib (15). The positioning indicator rib (15) and the upper limit block (14) form a limiting gap (150) for limiting the lower limit block (210). When the lower limit block (210) passes the positioning indicator rib (15), the lower limit block (210) enters the limiting gap (150) and is limited.

7. A sealing structure according to claim 6, characterized in that, Both ends of the positioning indicator rib (15) are provided with a first guide slope (151), and both ends of the bottom-touching limit block (210) are provided with a second guide slope (211) that is adapted to the first guide slope (151). When the bottom-touching limit block (210) enters the limiting gap (150), one end of the bottom-touching limit block (210) abuts against the bottom-touching upper limit block (14) for limiting, and the second guide slope (211) on the bottom-touching limit block (210) abuts against the first guide slope (151).

8. A sealing structure according to claim 3, characterized in that, A second limiting protrusion (16) is provided on the outer cylindrical surface (10) above the first limiting protrusion (13). One end of the second limiting protrusion (16) near the sealing guide seat (12) is flush with the first limiting protrusion (13). The distance from the second limiting protrusion (16) to the lower edge of the outer cylindrical surface (10) is greater than the distance from the sealing guide seat (12) to the lower edge of the outer cylindrical surface (10). A third limiting protrusion (212) is provided on the sealing seat (21). When the sealing seat (21) rotates along the guide surface (120) until the third limiting protrusion (212) abuts against the second limiting protrusion (16), the sealing seat (21) is fully inserted into the guide groove (130).

9. A sealing structure according to claim 1, characterized in that, The sealing ring (3) is connected to the lower housing (2) by adhesive bonding or injection molding.

10. A sealing structure according to claim 9, characterized in that, The sealing ring (3) includes a sealing ring body (30) and an annular sealing lip (31). The upper end face of the sealing ring body (30) is flush with the upper end face of the lower housing (2). The annular sealing lip (31) is disposed on the upper end face of the sealing ring body (30) and is an integral structure with the sealing ring body (30). The annular sealing lip (31) protrudes from the upper end face of the lower housing (2).

Images