Sealing plug and vacuum sealing structure

Abstract

The application provides a sealing plug and a vacuum sealing structure for sealing a connecting pipe, comprising: a plug body; the plug body extends in a cylindrical shape; the plug body has a first end and a second end at two ends thereof; an outer peripheral wall of the first end is used for abutting against an inner hole wall of the connecting pipe; a cross-sectional area of the second end gradually increases in a direction from the first end to the second end; an outer periphery of the second end is provided with an external thread for abutting against the inner hole wall of the connecting pipe; a receiving groove is concavely arranged on the plug body, the receiving groove is located on a side of the external thread facing the first end, and the receiving groove extends in a ring shape along a circumference of the plug body; and a sealing material in a paste or semi-fluid state is filled in the receiving groove. When the sealing plug is located in the connecting pipe, the sealing plug is limited in the connecting pipe under the action of vacuum negative pressure. When the sealing plug is slightly leaked, the sealing material flows along the external thread, so that a sealing barrier composed of the sealing material is formed at an end of the external thread, thereby improving the sealing performance of the sealing plug.

Description

Technical Field

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

[0002] In related technologies, vacuum containers have vacuum chambers to contain objects to be processed or tested, and can be widely used in fields such as technology research and development, material storage and transportation.

[0003] A vacuum sealing structure can be installed on the outer wall of the vacuum container. The vacuum sealing structure includes a connecting pipe and a sealing plug sealed within the connecting pipe. The connecting pipe connects to the vacuum chamber, enabling the vacuum container to be evacuated. The sealing plug seals the connecting pipe, ensuring the vacuum container's sealing performance after evacuation.

[0004] However, there is a tendency for gaps to exist between the current sealing plug and the connecting pipe, resulting in micro-leakage. External gas can flow along the gap between the sealing plug and the connecting pipe toward the vacuum chamber, thereby disrupting the vacuum environment of the vacuum container and making it inconvenient to use the vacuum container. Summary of the Invention

[0005] One objective of this application is to provide a sealing plug and a vacuum sealing structure with better sealing performance.

[0006] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0007] According to one aspect of this application, a sealing plug is provided for sealing a connecting pipe, comprising: a plug body; the plug body extending in a cylindrical shape; the axial ends of the plug body being a first end and a second end, respectively; the outer peripheral wall of the first end being used to fit against the inner wall of the connecting pipe; the cross-sectional area of ​​the second end gradually increasing in the direction from the first end to the second end; the outer periphery of the second end being provided with an external thread for fitting against the inner wall of the connecting pipe; the plug body being recessed with a receiving groove for receiving a sealing substance, the receiving groove being located on the side of the external thread facing the first end, and the receiving groove extending circumferentially along the plug body.

[0008] In this embodiment, the sealing plug further includes a sealing filler, which is arranged in a ring shape within the receiving groove to conform to the inner wall of the connecting pipe.

[0009] In this embodiment, the sealing filler is made of silicone grease or fluorinated ester.

[0010] In this embodiment, within the axial section of the plug body, the cross-section of the sealing groove is rectangular, trapezoidal, arc-shaped, or triangular.

[0011] In this embodiment, the outer periphery of the plug body is recessed with at least one sealing groove, the sealing groove is located on the side of the receiving groove facing the first end, and the sealing groove extends in a ring shape around the circumference of the plug body; the sealing plug also includes at least one elastic sealing ring, the elastic sealing ring is sleeved on the plug body and correspondingly received in the sealing groove, for sealing connection with the inner wall of the connecting pipe.

[0012] In this embodiment, the diameter of the second end is smaller than the diameter of the first end, and a sealing groove is disposed at the end of the first end facing the second end.

[0013] In this embodiment, the external thread is a tapered external thread; the pitch of the external thread ranges from 0.55mm to 2mm.

[0014] In this embodiment, within the axial cross-section of the plug, the angle between the inclined surface of the second end outer contour and the axis of the plug is less than 5° and greater than 0°.

[0015] In this embodiment, chamfers are provided on the opposite sides of the first end and the second end, and the chamfers extend in a ring shape around the circumference of the plug body.

[0016] A vacuum sealing structure includes: a connecting pipe and a sealing plug as described above; the connecting pipe extends in a cylindrical shape; the connecting pipe is used to communicate with a vacuum container having a vacuum chamber in the outside; the sealing plug is detachably accommodated in the inner hole of the connecting pipe for sealing the connecting pipe.

[0017] In this embodiment, the outer periphery of the plug body is recessed with at least one sealing groove; the sealing plug further includes at least one elastic sealing ring, which is sleeved on the plug body and correspondingly accommodated within the sealing groove; one sealing groove is disposed at the end of the first end facing the second end; in the direction from the first end to the second end, the inner wall of the connecting pipe is sequentially divided into a first fitting portion, a transition portion, and a second fitting portion corresponding to the outer contour of the sealing plug, the diameter of the first fitting portion is larger than the diameter of the second fitting portion, and the transition portion is frustum-shaped to connect the first fitting portion and the second fitting portion; the outer peripheral wall of the first end can fit into the first fitting portion; the elastic sealing ring located at the end of the first end facing the second end can fit into the transition portion; the portion of the external thread facing away from the first end can fit into the second fitting portion, so that the sealing plug can be sealed and connected within the inner hole of the vacuum connecting pipe.

[0018] As can be seen from the above technical solution, this application has at least the following advantages and positive effects: In this application, the receiving groove is used to fill a paste-like or semi-fluid sealing material. When the sealing plug is located inside the connecting pipe, the vacuum chamber is in a vacuum state. Under the action of vacuum negative pressure, the sealing plug is pressed and confined within the connecting pipe, with its external thread fitting against the inner wall of the connecting pipe. When the sealing plug leaks slightly, the sealing material flows along the external thread, and the flow resistance experienced by the sealing material continuously increases, causing the sealing material to form a sealing barrier composed of sealing material at the end of the external thread, thereby achieving a seal between the sealing plug and the connecting pipe and improving the sealing performance of the sealing plug. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the sealing plug of the present invention.

[0020] Figure 2 This is a cross-sectional view of the vacuum sealing structure of the present invention.

[0021] The reference numerals in the attached drawings are explained as follows: 100, connecting pipe; 110, first mating part; 120, transition part; 130, second mating part; 200, sealing plug; 210, plug body; 211, first end; 212, intermediate section; 213, second end; 214, receiving groove; 215, sealing groove; 216, chamfer; 217, mounting groove; 220, external thread; 230, sealing filler; 240, elastic sealing ring. Detailed Implementation

[0022] Typical embodiments embodying the features and advantages of this application will be described in detail in the following description. It should be understood that this application can have various variations in different embodiments, all of which do not depart from the scope of this application, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this application.

[0023] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In related technologies, vacuum containers have vacuum chambers to contain objects to be processed or tested, and can be widely used in fields such as technology research and development, material storage and transportation.

[0025] In related technologies, a vacuum sealing structure can be provided on the outer wall of the vacuum container. The vacuum sealing structure can include a connecting pipe and a sealing plug sealed within the connecting pipe. On one hand, operators can extract gas from the vacuum chamber through the connecting pipe to create a vacuum environment. On the other hand, after the vacuum chamber is evacuated, operators can seal the connecting pipe and the vacuum chamber with the sealing plug to ensure the vacuum chamber's airtightness and facilitate the use of the vacuum container.

[0026] Figure 1 This is a cross-sectional view of the sealing plug of the present invention. Figure 2 This is a cross-sectional view of the vacuum sealing structure of the present invention.

[0027] See Figure 1 and Figure 2 This application provides a sealing plug 200 for sealing a connecting pipe 100. The sealing plug 200 includes a plug body 210. The plug body 210 extends in a cylindrical shape. The two axial ends of the plug body 210 are a first end 211 and a second end 213, respectively. The outer peripheral wall of the first end 211 is used to fit against the inner wall of the connecting pipe 100. In the direction from the first end 211 to the second end 213, the cross-sectional area of ​​the second end 213 gradually increases to form a frustum shape. The outer periphery of the second end 213 is provided with an external thread 220 for fitting against the inner wall of the connecting pipe 100. The plug body 210 is recessed with a receiving groove 214 for receiving a sealing substance. The receiving groove 214 is located on the side of the external thread 220 facing the first end 211, and the receiving groove 214 extends circumferentially along the plug body 210.

[0028] When the sealing plug 200 is used, the operator first fills the receiving groove 214 with a paste-like or semi-fluid sealing substance, and then inserts the sealing plug 200 into the inner hole of the connecting pipe 100.

[0029] When the sealing plug 200 is located inside the connecting pipe 100, the vacuum chamber is in a vacuum state, and a pressure difference is formed between the inner and outer ends of the connecting pipe 100 to apply pressure to the sealing plug 200. Under the action of pressure, the sealing plug 200 is pressed and confined within the connecting pipe 100, and the external thread 220 is fitted against the inner wall of the connecting pipe 100.

[0030] Furthermore, when there is a slight leak due to a gap between the sealing plug 200 and the connecting pipe 100, the outside gas flows towards the vacuum chamber along the gap between the sealing plug 200 and the connecting pipe 100, and compresses the sealing material in the receiving groove 214. Under pressure, the sealing material flows along the external thread 220 and adheres to the external thread 220 and the inner wall of the connecting pipe 100.

[0031] In the direction from the first end 211 to the second end 213, the radial clearance between the external thread 220 and the inner wall of the connecting pipe 100 decreases linearly. As the sealing material flows along the external thread 220, the flow resistance experienced by the sealing material continuously increases. This increasing resistance effect allows the sealing material to maintain a high pressure in the penetration path, thereby densely filling all microscopic irregularities on the inner wall and the external thread 220, and forming a sealing barrier composed of sealing material at the end of the external thread 220 with the smallest clearance, thereby further improving the sealing performance of the sealing plug 200.

[0032] See Figure 1 and Figure 2 In this embodiment, the first end 211 and the second end 213 of the plug body 210 can both fit against the inner wall of the connecting pipe 100 to improve the sealing performance of the sealing plug 200.

[0033] In some embodiments, the diameter of the second end 213 is smaller than the diameter of the first end 211. When the sealing plug 200 is inserted into the inner hole of the connecting pipe 100, the second end 213 inserts into the connecting pipe 100 first, followed by the first end 211. Both the second end 213 and the first end 211 can fit against the inner wall of the connecting pipe 100. Furthermore, due to the negative pressure of the vacuum chamber, the sealing plug 200 can be pressed against the inner wall of the connecting pipe 100. The greater the pressure difference, the greater the pressure on the sealing plug 200, and the better the sealing performance between the sealing plug 200 and the connecting pipe 100, thereby effectively ensuring the reliability and stability of the vacuum sealing structure.

[0034] In other embodiments, the axes of the second end 213 and the first end 211 are coaxially arranged so that the pressure on the sealing plug 200 is uniform, thereby ensuring the reliability and stability of the sealing plug 200.

[0035] See Figure 1 and Figure 2 In this embodiment, the cross-sectional area of ​​the second end 213 gradually increases in the direction from the first end 211 toward the second end 213, so that the second end 213 is shaped like a frustum. An external thread 220 is provided on the outer periphery of the second end 213, and the external thread 220 is adapted to the outer contour of the second end 213 to form a frustum shape.

[0036] When the sealing plug 200 leaks slightly, the sealing material flows out of the receiving groove 214 under pressure. The external thread 220 guides the sealing material to flow spirally, causing it to gradually flow into the channel with a gradually narrowing radial gap, thereby gradually increasing the flow resistance on the sealing material. The increasing flow resistance allows the sealing material to maintain a high pressure in the flow path, ensuring that all micro-irregularities on the external thread 220 and part of the micro-irregularities on the inner hole of the connecting pipe 100 are fully and densely filled. Finally, a sealing barrier composed of high-density sealing material is formed between the end of the external thread 220 with the smallest gap and the inner wall of the connecting pipe 100. The structure of this sealing plug 200 achieves active control over the flow of the sealing material and the formation of the sealing barrier.

[0037] In some embodiments, the external thread 220 may be a tapered external thread 220 to facilitate the flow of the sealing material.

[0038] In some embodiments, the pitch of the external thread 220 ranges from 0.55 mm to 2 mm, so that the sealing material can form a sealing barrier between the external thread 220 and the inner wall of the connecting pipe 100, thereby improving the structural strength and reliability of the sealing barrier.

[0039] In some embodiments, the external thread 220 is integrally formed with the plug body 210 to improve the structural strength and reliability of the sealing plug 200.

[0040] See Figure 1 and Figure 2 In this embodiment, within the axial section of the plug body 210, the angle between the inclined surface of the outer contour of the second end 213 and the axis of the plug body 210 is less than 5° and greater than 0°, so that the second end 213 is frustum-shaped, thereby facilitating the formation of a sealing barrier by the sealing material.

[0041] In some embodiments, the external thread 220 is wound around a frustum-shaped outer contour so that the external thread 220 is frustum-shaped. There is a radial gap between the frustum-shaped external thread 220 and the inner wall of the connecting pipe 100, and the large-diameter end of the external thread 220 is used to fit against the inner wall of the connecting pipe 100.

[0042] In the direction from the first end 211 to the second end 213, the radial dimension of the radial clearance gradually decreases. The gradually decreasing radial clearance enables the regulation of the flow resistance and final sealing pressure of the sealing material, facilitates the formation of the sealing barrier, and makes the sealing performance of the sealing plug 200 consistent and predictable, effectively improving the reliability and sealing performance of the sealing plug 200.

[0043] See Figure 1 and Figure 2In this embodiment, the receiving groove 214 can be disposed on the second end 213 and disposed close to the external thread 220 so that the sealing material can flow along the external thread 220.

[0044] In some embodiments, within the axial section of the plug 210, the cross-section of the receiving groove 214 can be rectangular, trapezoidal, arc-shaped, or triangular.

[0045] When the cross-section of the receiving groove 214 is rectangular, the receiving groove 214 can hold more sealing material to improve the sealing performance of the sealing plug 200.

[0046] When the cross-section of the receiving groove 214 is trapezoidal, the length of the sealing plug 200 gradually increases along its axial direction in the direction away from the axis of the sealing plug 200. The side of the receiving groove 214 facing the external thread 220 is a bevel, so that the sealing material can flow along the bevel of the trapezoid towards the external thread 220 under pressure and gravity, which facilitates the sealing material to form a sealing barrier and improves the sealing performance of the sealing plug 200.

[0047] When the cross-section of the receiving groove 214 is arc-shaped, the length of the sealing plug 200 gradually increases along its axial direction in the direction away from the axis of the sealing plug 200. The side of the receiving groove 214 facing the external thread 220 is an arc-shaped bevel, so that the sealing material can flow along the arc-shaped side towards the external thread 220 under pressure and gravity, which facilitates the sealing material to form a sealing barrier and improves the sealing performance of the sealing plug 200.

[0048] When the cross-section of the receiving groove 214 is triangular, the length of the sealing plug 200 gradually increases along its axial direction in the direction away from the axis of the sealing plug 200. The side of the receiving groove 214 facing the external thread 220 is a hypotenuse, so that the sealing material can flow along the hypotenuse of the triangle toward the external thread 220 under pressure and gravity, which facilitates the sealing material to form a sealing barrier and improves the sealing performance of the sealing plug 200.

[0049] See Figure 1 and Figure 2In this embodiment, the sealing plug 200 may further include a sealing filler 230. The sealing filler 230 is annularly positioned within the receiving groove 214 to conform to the inner wall of the connecting pipe 100. The sealing filler 230 is composed of the aforementioned paste-like or semi-fluid sealing material. On one hand, the sealing filler 230 extends annularly to improve the sealing performance between the sealing plug 200 and the connecting pipe 100; on the other hand, when there is a gap and slight leakage on the periphery of the sealing plug 200 and the connecting pipe 100, the sealing material in the sealing filler 230 can flow along the external thread 220, densely filling all microscopic irregularities of the inner wall and the external thread 220, and forming a sealing barrier composed of sealing material at the thread end with the smallest radial clearance, thereby further improving the sealing performance of the sealing plug 200.

[0050] It is understood that the sealing plug 200 may include a sealing filler 230 to facilitate the use of the sealing plug 200, reduce the number of operating steps for operators, and improve the efficiency of the sealing plug 200. Alternatively, the sealing plug 200 may not include a sealing filler 230. Instead, a sealing material can be temporarily filled into the receiving groove 214 to form the sealing filler 230 during operation. This allows the sealing filler 230 to fit snugly against the inner wall of the connecting pipe 100 after the sealing plug 200 is inserted into the connecting pipe 100, thereby improving the sealing performance between the sealing plug 200 and the connecting pipe 100.

[0051] In some embodiments, in a direction away from the axis of the plug 210, the sealing filler 230 extends outward beyond the opening of the receiving groove 214 so that the sealing filler 230 fits against the inner wall of the connecting pipe 100, thereby ensuring the sealing performance between the sealing plug 200 and the connecting pipe 100.

[0052] In some embodiments, the sealing material constituting the sealing filler 230 may be silicone grease or fluorinated ester. In other embodiments, the sealing filler 230 may also be made of perfluoropolyether ester.

[0053] See Figure 1 and Figure 2 In this embodiment, the outer periphery of the plug body 210 may be recessed with at least one sealing groove 215. The sealing groove 215 is located on the side of the receiving groove 214 facing the first end 211, and the sealing groove 215 extends in a ring shape around the circumference of the plug body 210. The sealing plug 200 may also include at least one elastic sealing ring 240. The elastic sealing ring 240 is sleeved on the plug body 210 and correspondingly received in the sealing groove 215 for sealing connection with the inner wall of the connecting pipe 100, thereby forming an elastic sealing barrier and improving the sealing performance and reliability of the plug body 210 and the connecting pipe 100.

[0054] Understandably, the sealing plug 200 can be inserted and removed multiple times to facilitate the use of the vacuum container. However, during repeated insertion and removal, the elastic sealing ring 240 may experience micro-leakage due to aging, wear, or localized deformation. Alternatively, when the vacuum container is in a vibrating environment, the sealing plug 200 may experience micro-leakage due to vibration. In such cases, the sealing filler 230 can form a sealing barrier between the external thread 220 and the inner wall of the connecting pipe 100 to further ensure the sealing performance of the sealing plug 200 and extend the service life and reliability of the vacuum sealing structure.

[0055] In some embodiments, when the sealing plug 200 is located outside the connecting pipe 100, the outer side of the elastic sealing ring 240 may extend beyond the outer peripheral wall of the plug body 210 in the radial direction. When the sealing plug 200 extends into the inner hole of the connecting pipe 100, the elastic sealing ring 240 deforms under pressure, thereby pressing against the inner wall of the sealing groove 215 and the inner wall of the connecting pipe 100, achieving a sealed connection between the sealing plug 200 and the connecting pipe 100, and improving the reliability and stability of the sealing plug 200.

[0056] In some embodiments, the plug body 210 may be provided with a plurality of sealing grooves 215, which are spaced apart along the axial direction of the plug body 210. Each of the plurality of sealing grooves 215 may accommodate an elastic sealing ring 240, thereby achieving multiple seals on the sealing plug 200 and improving its sealing performance.

[0057] In some embodiments, a sealing groove 215 may be disposed at the end of the first end 211 facing the second end 213. In the axial direction of the plug body 210, the outer contour of one end of the sealing groove 215 is flush with the outer contour of the first end 211, and the outer contour of the other end of the sealing groove 215 is flush with the outer contour of the second end 213, so that the cross-section of the sealing groove 215 is a right-angled trapezoid. This allows the elastic sealing ring 240 within the sealing groove 215 to adapt to the transition portion of the inner wall of the connecting pipe 100, further increasing the deformation of the elastic sealing ring 240 and improving the sealing performance between the elastic sealing ring 240 and the inner wall of the sealing groove 215 and the inner wall of the connecting pipe 100.

[0058] In some embodiments, within the axial section of the plug body 210, a chamfer is provided at the outer opening of the sealing groove 215. The chamfer extends in a ring shape around the axial direction of the plug body 210 to facilitate the installation of the elastic sealing ring 240, prevent scratches and damage to the elastic sealing ring 240, and ensure the reliability of the elastic sealing ring 240.

[0059] In some embodiments, the cross-section of the elastic sealing ring 240 in the axial section of the plug body 210 may be approximately circular to facilitate the installation of the elastic sealing ring 240 and to ensure the sealing performance between the elastic sealing ring 240 and the inner wall of the sealing groove 215 and the inner wall of the connecting pipe 100.

[0060] See Figure 1 and Figure 2 In this embodiment, the plug 210 may also have an intermediate section 212 between the first end 211 and the second end 213. The intermediate section 212 is used to connect the first end 211 and the second end 213. The diameter of the intermediate section 212 is smaller than the diameter of the first end 211, and the diameter of the intermediate section 212 may be smaller than the diameter of the large diameter end of the external thread 220, so that the intermediate section 212 is spaced apart from the inner wall of the connecting pipe 100, thereby facilitating the passage of gas drawn into the gap between the first end 211 and the connecting pipe 100 through the intermediate section 212 and the connecting pipe 100, and facilitating the application of pressure by the gas to the sealing material.

[0061] In some embodiments, the diameter of the intermediate section 212 may also be equal to the diameter of the large diameter end of the external thread 220, so that the intermediate section 212 can fit against the inner wall of the connecting pipe 100, thereby further improving the sealing performance of the sealing plug 200.

[0062] In some embodiments, the first end 211, the middle section 212 and the second end 213 are integrally formed to improve the structural strength of the sealing plug 200.

[0063] In some embodiments, a sealing groove 215 is located at the end of the first end 211 facing the end of the second end 213. In the axial direction of the plug body 210, the outer contour of one end of the sealing groove 215 is flush with the outer contour of the first end 211, and the outer contour of the other end of the sealing groove 215 is flush with the outer contour of the transition portion 120, so that the cross-section of the sealing groove 215 is a right trapezoid, thereby making the elastic sealing ring 240 in the sealing groove 215 adapt to the transition portion of the inner hole wall of the connecting pipe 100, further increasing the deformation of the elastic sealing ring 240, and improving the sealing performance between the elastic sealing ring 240 and the inner wall of the sealing groove 215 and the inner hole wall of the connecting pipe 100.

[0064] In some embodiments, the intermediate section 212 may not be required, and the plug body 210 may only include the first end 211 and the second end 213 to achieve multiple seals for the vacuum device.

[0065] See Figure 1 and Figure 2In this embodiment, the plug body 210 is provided with chamfers 216 on the opposite sides of the first end 211 and the second end 213. The chamfers 216 extend in a ring around the circumference of the plug body 210 to facilitate the use of the sealing plug 200 and to facilitate the sealing plug 200 to extend into the inner hole of the connecting pipe 100, thereby improving the reliability and stability of the sealing plug 200.

[0066] Understandably, chamfer 216 does not affect the overall taper and shape trend of the first end 211 and the second end 213.

[0067] See Figure 1 and Figure 2 In this embodiment, the end face of the plug 210 at the first end 211 may also be recessed with a mounting groove 217. The mounting groove 217 is used to connect with an external installation device, thereby facilitating the connection and movement of the sealing plug by the external installation device.

[0068] In this embodiment, the plug 210 can be made of metal or plastic, as long as the structural strength of the plug 210 can be guaranteed.

[0069] See Figure 1 and Figure 2 When the sealing plug 200 is used, it is moved into the connecting pipe 100 so that the large diameter end of the external thread 220 fits against the inner wall of the connecting pipe 100, the sealing filler 230 fits against the inner wall of the connecting pipe 100, and multiple elastic sealing rings 240 abut against the inner wall of the connecting pipe 100, so that multiple seals are formed between the plug body 210 and the connecting pipe 100, thereby effectively improving the sealing performance of the vacuum sealing structure.

[0070] When there is a slight leak due to a gap between the plug 210, the elastic sealing gasket, and the inner wall of the connecting pipe 100, the external gas flows towards the vacuum chamber under the vacuum negative pressure. When the external gas flows to the sealing filler 230, the sealing material flows onto the external thread 220 under its own weight and the pressure of the gas, and flows towards the vacuum chamber along the external thread 220. Due to the action of the frustum-shaped second end 213 and the external thread 220, the sealing material gradually flows into the channel with the radial gap gradually narrowing during the flow process, thereby gradually increasing the flow resistance of the sealing material. The increasing flow resistance allows the sealing material to maintain a high pressure in the flow path, thereby ensuring that all micro-irregularities on the external thread 220 and part of the micro-irregularities on the inner hole of the connecting pipe 100 are fully and densely filled. Finally, a sealing barrier made of high-density sealing material is formed between the end of the external thread 220 with the smallest gap and the inner wall of the connecting pipe 100, effectively improving the sealing performance of the sealing plug 200 and the connecting pipe 100.

[0071] See Figure 1 and Figure 2 This application also provides a vacuum sealing structure, comprising: a connecting pipe 100 and a sealing plug 200 as described above. The connecting pipe 100 extends in a cylindrical shape; the connecting pipe 100 is used to communicate with a vacuum container having a vacuum chamber in the outside. The sealing plug 200 is detachably accommodated within the inner hole of the connecting pipe 100 for sealing the connecting pipe 100.

[0072] Both the first end 211 and the second end 213 of the sealing plug 200 can fit against the inner wall of the connecting pipe 100 to achieve a sealed connection between the sealing plug 200 and the connecting pipe 100.

[0073] Furthermore, when there is a slight leak due to gaps between the plug 210, the elastic sealing gasket, and the inner wall of the connecting pipe 100, the sealing material flows to the external thread 220 under its own weight and gas pressure, fully and densely filling all the micro-irregularities on the external thread 220, as well as partially filling the micro-irregularities on the inner hole of the connecting pipe 100. Simultaneously, it forms a sealing barrier of high-density sealing material between the end of the external thread 220 (with the smallest gap) and the inner wall of the connecting pipe 100, effectively improving the sealing performance of the plug 200 and the connecting pipe 100.

[0074] See Figure 1 and Figure 2 In this embodiment, the inner wall of the connecting pipe 100 is configured to correspond to the outer contour of the sealing plug 200, so that the inner wall of the connecting pipe 100 can fit against the outer wall of the sealing plug 200.

[0075] In some embodiments, the diameter of the first end 211 is larger than the diameter of the second end 213. A first fitting portion 110 is provided on the inner wall of the connecting pipe 100 corresponding to the first end 211. A second fitting portion 130 is provided on the inner wall of the connecting pipe 100 corresponding to the second end 213. The diameter of the first fitting portion 110 is larger than the diameter of the second fitting portion 130.

[0076] When the sealing plug 200 is housed in the inner hole of the connecting pipe 100, the outer peripheral wall of the first end 211 is attached to the first fitting part 110, and the portion of the external thread 220 that is away from the first end 211 can be attached to the second fitting part 130, so that the sealing plug 200 can be sealed and connected to the inner hole of the connecting pipe 100, thereby achieving a sealed connection between the sealing plug 200 and the connecting pipe 100 and ensuring the reliability and stability of the vacuum sealing structure.

[0077] In some embodiments, the outer periphery of the plug body 210 may be recessed with at least one sealing groove 215. The sealing plug 200 also includes at least one elastic sealing ring 240, which is sleeved on the plug body 210 and correspondingly accommodated within the sealing groove 215.

[0078] When the sealing plug 200 is placed inside the inner hole of the connecting pipe 100, the elastic sealing ring 240 can be pressed against the first mating part 110 to form a sealing barrier between the plug body 210 and the connecting pipe 100, thereby achieving multi-level sealing of the sealing plug 200, effectively improving the sealing performance of the vacuum sealing structure, and ensuring the reliability and stability of the vacuum sealing structure.

[0079] In other embodiments, a sealing groove 215 may be provided at the end of the first end 211 facing the second end 213, and an elastic sealing ring 240 may be provided in the sealing groove 215.

[0080] In the direction from the first end 211 to the second end 213, the inner wall of the connecting pipe 100, corresponding to the outer contour of the sealing plug 200, may be provided with a first fitting portion 110, a transition portion 120, and a second fitting portion 130 in sequence. The transition portion 120 is frustoconical in shape to connect the first fitting portion 110 and the second fitting portion 130.

[0081] At this time, the elastic sealing ring 240 located at the end of the first end 211 facing the end of the second end 213 can fit into the transition portion 120. Since the pressure on the sealing plug 200 is set along its own axial direction, the sealing plug 200 can apply pressure to the elastic sealing ring 240 and press the elastic sealing ring 240 onto the transition portion, thereby further improving the sealing performance between the sealing plug 200 and the connecting pipe 100 and ensuring the reliability and stability of the vacuum sealing structure.

[0082] In some embodiments, the plug 210 includes a middle section 212. The middle section 212 is disposed corresponding to the second fitting portion 130. The outer peripheral wall of the middle section 212 may be spaced apart from the second fitting portion 130; or, the outer peripheral wall of the middle section 212 may be fitted to the second fitting portion 130.

[0083] It is understandable that an installation tolerance is reserved between the plug body 210 and the inner wall of the connecting pipe to facilitate the installation of the plug body 210 and ensure that the plug body 210 fits against the inner wall after assembly.

[0084] In some embodiments, the connecting pipe 100 is provided with a chamfer at the inlet end of the inner bore. The chamfer extends circumferentially along the inner bore to facilitate the entry of the sealing plug 200 into the inner bore.

[0085] The above embodiments are merely illustrative examples of structures. The structures in each embodiment are not fixed combinations. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used.

[0086] Although this application has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since this application can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A sealing plug for sealing a connecting pipe, characterized in that, include: A plug body extends in a cylindrical shape; the two axial ends of the plug body are a first end and a second end, respectively; the outer peripheral wall of the first end is used to fit the inner wall of the connecting pipe; the cross-sectional area of ​​the second end gradually increases in the direction from the first end to the second end; the outer periphery of the second end is provided with an external thread for fitting the inner wall of the connecting pipe; the plug body is recessed with a receiving groove for accommodating a sealing substance, the receiving groove is located on the side of the external thread facing the first end, and the receiving groove extends in a ring shape along the circumference of the plug body.

2. The sealing plug according to claim 1, characterized in that, The sealing plug also includes a sealing filler, which is arranged in a ring shape within the receiving groove to conform to the inner wall of the connecting pipe.

3. The sealing plug according to claim 2, characterized in that, The sealing filler is made of silicone grease or fluorinated ester.

4. The sealing plug according to claim 1, characterized in that, Within the axial section of the plug body, the cross-section of the sealing groove is rectangular, trapezoidal, arc-shaped, or triangular.

5. The sealing plug according to claim 1, characterized in that, The outer periphery of the plug is recessed with at least one sealing groove, the sealing groove is located on the side of the receiving groove facing the first end, and the sealing groove extends in a ring shape around the circumference of the plug. The sealing plug further includes at least one elastic sealing ring, which is sleeved on the plug body and correspondingly accommodated in the sealing groove for sealing connection with the inner wall of the connecting pipe.

6. The sealing plug according to claim 5, characterized in that, The diameter of the second end is smaller than that of the first end, and a sealing groove is provided at the end of the first end facing the second end.

7. The sealing plug according to claim 1, characterized in that, The external thread is a tapered external thread; the pitch of the external thread ranges from 0.55mm to 2mm.

8. The sealing plug according to claim 1, characterized in that, Within the axial section of the plug, the angle between the inclined surface of the second end outer contour and the axis of the plug is less than 5° and greater than 0°.

9. The sealing plug according to claim 1, characterized in that, Both the first end and the second end have chamfers on opposite sides, and the chamfers extend in a ring shape around the circumference of the plug body.

10. A vacuum sealing structure, characterized in that, include: A connecting pipe, which extends in a cylindrical shape; the connecting pipe is used to connect with a vacuum container with a vacuum chamber in the outside. The sealing plug as claimed in any one of claims 1 to 9 is detachably received within the inner bore of the connecting pipe for sealing the connecting pipe.

11. The vacuum sealing structure according to claim 10, characterized in that, The outer periphery of the plug body is recessed with at least one of the sealing grooves; the sealing plug also includes at least one of the elastic sealing rings, which are sleeved on the plug body and correspondingly accommodated in the sealing groove; one of the sealing grooves is disposed at the end of the first end facing the second end; In the direction from the first end to the second end, the inner wall of the connecting pipe is divided into a first fitting portion, a transition portion, and a second fitting portion in sequence according to the outer contour of the sealing plug. The diameter of the first fitting portion is larger than the diameter of the second fitting portion. The transition portion is frustum-shaped to connect the first fitting portion and the second fitting portion. The outer peripheral wall of the first end can fit into the first fitting portion. The elastic sealing ring located at the end of the first end facing the second end can fit into the transition portion. The portion of the external thread facing away from the first end can fit into the second fitting portion so that the sealing plug can be sealed and connected to the inner hole of the vacuum connector.

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