A self-sealing hermetic test quick connector locking sleeve device

Abstract

The utility model provides a kind of self-sealing airtight test quick connector locking sleeve device, belong to self-sealing airtight test quick connector locking sleeve technical field, this self-sealing airtight test quick connector locking sleeve device includes locking sleeve body, sealing ring, compression ring and limit piece;The locking sleeve body is cylindrical structure, the inner wall of locking sleeve body is provided with thread section and smooth section along circumference, the thread section is located at one end of locking sleeve body, the smooth section is located at the other end of locking sleeve body;The sealing ring is arranged in the inside of locking sleeve body, and sealing ring is annular structure, the outer diameter of sealing ring is matched with the inner diameter of locking sleeve body smooth section, and the inner wall of sealing ring is provided with inverted conical sealing surface;The compression ring is arranged between sealing ring and thread section;It can solve the problem that existing airtight test connector exists when connecting measured workpiece sealing reliability is poor, installation is inconvenient, sealing performance declines after repeated use and the ability of adapting to different workpiece sizes is weak.

Description

Technical Field

[0001] This utility model belongs to the technical field of self-sealing airtightness test quick connector locking sleeve, specifically, it relates to a self-sealing airtightness test quick connector locking sleeve device. Background Technology

[0002] In modern industrial production, airtightness testing is a crucial step in ensuring product quality and is widely used in automotive manufacturing, aerospace, piping systems, refrigeration equipment, and medical devices. Traditional airtightness testing connectors mainly employ flange connections, threaded connections, or clamp connections. These connection methods generally have many shortcomings. Flange connections require multiple bolts for tightening, making the installation process cumbersome, time-consuming, and requiring specialized tools. The preload of the bolts is difficult to control precisely, leading to unstable sealing performance. While threaded connections have a simple structure, the seal relies mainly on the compression of the threads themselves and the filling of sealant. After repeated disassembly and assembly, the threads wear out severely, causing a sharp decline in sealing performance. Clamp connections, although relatively convenient to operate, rely mainly on the radial compression of the rubber ring for sealing, requiring high surface quality and tightness of the workpiece being tested. Uneven pressure distribution leads to frequent leaks in existing airtightness testing connectors during practical applications, especially under high-pressure testing or when the workpiece surface has minor defects. This not only affects the accuracy of test results but also increases the number of repeated tests and costs. Existing connectors have poor adaptability to workpieces of different sizes, typically requiring multiple sets of connectors for different specifications, increasing equipment investment and management complexity. The short service life of the seals necessitates frequent replacements, increasing maintenance costs and downtime. With the development of industrial automation and intelligent manufacturing, higher demands are placed on the efficiency and reliability of airtightness testing. There is an urgent need for an airtightness testing connector device that can be quickly installed, provides reliable sealing, is highly adaptable, and is easy to maintain to solve the above technical problems. Utility Model Content

[0003] In view of this, the present invention provides a self-sealing quick-connect locking sleeve device for airtightness testing, which can solve the technical problems of existing airtightness testing connectors when connecting to the workpiece under test, such as poor sealing reliability, inconvenient installation and adjustment, decreased sealing performance after repeated use, and weak ability to adapt to different workpiece sizes. These problems lead to frequent leakage during airtightness testing, affecting testing accuracy and efficiency, increasing testing costs and time, and failing to meet the requirements of modern industrial production for efficient and accurate airtightness testing.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a self-sealing airtightness testing quick-connect locking sleeve device for connecting airtightness testing equipment and the workpiece under test. It includes a locking sleeve body, a sealing ring, a clamping ring, and a limiting member. The locking sleeve body has a cylindrical structure, with a threaded section and a smooth section circumferentially arranged on its inner wall. The threaded section is located at one end of the locking sleeve body, and the smooth section is located at the other end. The sealing ring is located inside the locking sleeve body and has an annular structure. The outer diameter of the sealing ring matches the inner diameter of the smooth section of the locking sleeve body, and the inner wall of the sealing ring has an inverted conical sealing surface. The clamping ring is located between the sealing ring and the threaded section. The clamping ring also has an annular structure, and its outer wall has an external thread that mates with the threaded section. The inner side of the clamping ring has a pushing surface that is in close contact with the outer surface of the sealing ring. The limiting member is located at the end of the smooth section of the locking sleeve body and has an annular boss structure. The inner diameter of the limiting member is smaller than the outer diameter of the sealing ring, used to restrict the axial movement of the sealing ring.

[0006] The technical advantages of the self-sealing airtightness testing quick connector locking sleeve device provided by this utility model are as follows: By setting a combination structure of sealing ring, pressure ring and limiting component inside the locking sleeve body, the integrated design of quick locking and self-sealing functions is realized. The inverted conical sealing surface of the sealing ring forms a tight fit with the surface of the workpiece being tested. The pressure ring generates axial thrust through threaded rotation and acts on the sealing ring, so that the inverted conical sealing surface of the sealing ring generates radial pressure on the workpiece being tested, thereby forming a reliable airtight seal. The limiting component effectively prevents the sealing ring from axially dislodging during the pressing process, ensuring the structural stability and sealing reliability of the entire device. At the same time, the segmented design of the threaded section and the smooth section allows the device to be installed quickly and the pressing force to be adjusted precisely.

[0007] Based on the above technical solution, the self-sealing airtightness testing quick connector locking sleeve device of this utility model can be further improved as follows:

[0008] The inverted conical sealing surface of the sealing ring has a cone angle of 15~30°, and the inverted conical sealing surface gradually expands from the front end to the rear end of the sealing ring.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the inverted conical sealing surface of the sealing ring adopts a cone angle design of 15~30°. This cone angle range can generate an appropriate radial expansion component when the axial force is applied to the clamping ring, so that the sealing ring and the surface of the workpiece being tested form a uniform contact pressure distribution. If the cone angle is too small, the radial expansion force will be insufficient and affect the sealing effect. If the cone angle is too large, the sealing ring will undergo excessive deformation or even flip. This cone angle range ensures that the sealing ring can generate sufficient sealing pressure during the clamping process without failing due to excessive deformation. At the same time, the structure that gradually expands from the front end to the rear end allows the sealing ring to smoothly transition under pressure without stress concentration.

[0010] Furthermore, the pressing surface of the clamping ring has a conical structure, and the cone angle of the conical pressing surface matches the chamfer of the outer side of the sealing ring, forming a surface contact between the two.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the pressing surface of the clamping ring is designed as a conical structure and matches the chamfer on the outer side of the sealing ring, so that the two form a surface contact rather than a point contact or line contact. This surface contact method can evenly distribute the axial force transmitted by the clamping ring to the entire outer surface of the sealing ring, avoiding damage or uneven deformation of the sealing ring caused by local stress concentration. At the same time, the cone angle matching design allows the clamping ring to smoothly push the sealing ring forward when rotating, reducing frictional resistance and energy loss, improving clamping efficiency and service life of the sealing ring, and ensuring that the sealing ring can maintain good sealing performance during repeated use.

[0012] Furthermore, the length of the threaded section of the locking sleeve body accounts for 1 / 2 to 2 / 3 of the total length of the locking sleeve body along the axial direction, and the thread of the threaded section is a trapezoidal thread or a triangular thread.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the length of the threaded section of the locking sleeve body accounts for 1 / 2 to 2 / 3 of the total length. This proportional design allows the clamping ring to have sufficient rotational adjustment stroke to adapt to the size changes and sealing requirements of different workpieces. If the threaded section is too short, it will limit the adjustment range of the clamping ring and reduce its applicability. If the threaded section is too long, it will reduce the overall rigidity of the locking sleeve body and affect the structural stability. The selection of trapezoidal or triangular threads can provide good self-locking performance and force transmission efficiency. Trapezoidal threads have strong load-bearing capacity and are suitable for high clamping force applications. Triangular threads have good self-locking performance and are suitable for applications that need to maintain a clamped state for a long time. This design takes into account the balance between adjustment flexibility and structural stability.

[0014] Furthermore, the outer surface of the sealing ring is provided with an annular groove, which extends circumferentially along the sealing ring, and the front end of the pressing face of the pressing ring is provided with an annular protrusion that cooperates with the annular groove.

[0015] The beneficial effects of the above-mentioned improvement scheme are as follows: An annular groove is set on the outer side of the sealing ring and an annular protrusion is set on the front end of the pressing ring to match it, forming a mechanical positioning and guiding structure. When the pressing ring rotates and advances, the annular protrusion is embedded in the annular groove, which can effectively prevent the sealing ring from rotating circumferentially or shifting radially during the pressure process, ensuring that the sealing ring always moves correctly along the axial direction and maintains coaxiality with the workpiece being measured. This positioning structure also increases the contact area between the pressing ring and the sealing ring, making the thrust transmission more uniform and reliable. At the same time, the setting of the annular groove also provides a certain deformation space for the sealing ring when it is deformed under pressure, avoiding the sealing ring from tearing or permanent deformation due to lack of stress release.

[0016] Furthermore, the connection between the limiting member and the smooth section of the locking sleeve body has an arc transition structure, and the radius of curvature of the arc transition structure is half to twice the height of the limiting member boss.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the connection between the limiting member and the smooth section of the locking sleeve body adopts an arc transition structure. The radius of curvature of the arc transition is set to half to two times the height of the limiting member boss. This design can effectively eliminate the stress concentration caused by sharp corners, improve the structural strength and fatigue resistance of the connection between the limiting member and the locking sleeve body. The arc transition also allows the sealing ring to smoothly contact the limiting member without impact damage when it moves axially to the limiting position. At the same time, the radius of curvature range ensures sufficient smoothness of transition without occupying too much axial space, maintaining the compactness of the device. This design extends the service life of the limiting member and the sealing ring and improves the reliability of the entire device.

[0018] Furthermore, the inner wall of the smooth section of the locking sleeve body is provided with a plurality of axially extending guide grooves, the guide grooves having a rectangular or trapezoidal cross section, and the outer side of the sealing ring is provided with guide protrusions that cooperate with the guide grooves.

[0019] The beneficial effects of the above-mentioned improvement scheme are as follows: multiple axially extending guide grooves are provided on the inner wall of the smooth section of the locking sleeve body, and matching guide protrusions are provided on the outer side of the sealing ring, forming a guiding mechanism of guide grooves and guide protrusions. This mechanism can force the sealing ring to maintain a fixed circumferential position without rotation during axial movement, ensuring that the inverted conical sealing surface of the sealing ring always contacts the workpiece in the correct posture. The rectangular or trapezoidal cross-section design of the guide grooves can provide a reliable anti-rotation effect and facilitate processing and manufacturing. At the same time, the cooperation between the guide grooves and guide protrusions also increases the contact area between the sealing ring and the locking sleeve body, improving the stability of the sealing ring installation. This guiding structure is of great significance for applications that require precise sealing positions.

[0020] Furthermore, the pitch of the external thread of the clamping ring is equal to the pitch of the thread section of the locking sleeve body, and the rear end face of the clamping ring is provided with multiple anti-slip patterns evenly distributed along the circumference, the anti-slip patterns being radially or grid-like.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the pitch of the external thread of the clamping ring is equal to the pitch of the thread section of the locking sleeve body, ensuring that the two can smoothly mesh and accurately transmit torque. The multiple circumferentially distributed anti-slip textures on the rear end face of the clamping ring can increase the friction between the operator's fingers or tools and the clamping ring, making the rotation operation of the clamping ring more convenient, reliable and less prone to slippage. The radial anti-slip textures provide a centripetal friction distribution suitable for hand operation, while the grid-like anti-slip textures provide multi-directional friction suitable for operation with tools such as wrenches. This anti-slip design not only improves the convenience and safety of operation, but also enables the clamping ring to apply sufficient torque to generate the required sealing pressure, reducing sealing failure caused by improper operation.

[0022] Furthermore, the sealing ring is made of rubber or polyurethane, the locking sleeve body and the clamping ring are made of stainless steel or aluminum alloy, and the limiting member and the locking sleeve body are integrally formed.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the sealing ring is made of rubber or polyurethane material, which can provide good elastic deformation capacity and sealing performance. These materials can fully deform under pressure to adapt to the slight unevenness of the surface of the workpiece being tested and fill the gap. The locking sleeve body and the clamping ring are made of stainless steel or aluminum alloy material, which provides sufficient structural strength and corrosion resistance. Stainless steel material has high strength and good durability and is suitable for high pressure or corrosive environments. Aluminum alloy material is lightweight and easy to operate, which is suitable for occasions with frequent disassembly and assembly. The integral molding structure of the limiting part and the locking sleeve body eliminates the risk of loosening or breakage at the connection part, and improves the reliability and service life of the overall structure. This material combination achieves an optimized match between sealing performance and structural strength.

[0024] Furthermore, the surface roughness of the inverted conical sealing surface of the sealing ring is less than the surface roughness of the pressing surface of the compression ring, and the radial thickness of the sealing ring gradually increases from the front end to the rear end along the axial direction, with the radial thickness at the rear end of the sealing ring being greater than that at the front end.

[0025] The beneficial effects of the above-mentioned improvement scheme are as follows: the surface roughness of the inverted conical sealing surface of the sealing ring is less than that of the pressing surface of the compression ring, which allows the sealing surface to form a tighter and smoother contact with the workpiece being tested to reduce leakage channels. The relatively rough surface of the pressing surface can increase the friction between the sealing ring and the outer side of the sealing ring to prevent relative sliding. The design of the sealing ring with the radial thickness gradually increasing from the front end to the rear end along the axial direction allows the front end of the sealing ring to undergo elastic deformation first and expand outward to contact the workpiece being tested when under pressure. As the clamping force increases, the thicker part at the rear end provides greater support stiffness to prevent the sealing ring from being excessively deformed or overturned. This variable thickness design optimizes the deformation characteristics of the sealing ring at different clamping stages, ensuring both the sensitivity of the initial contact and the stability and reliability of the final seal.

[0026] Compared with existing technologies, the advantages of the self-sealing airtightness testing quick connector locking sleeve device provided by this utility model are as follows: This utility model achieves an organic combination of quick locking and self-sealing functions through the ingenious cooperation of the locking sleeve body, sealing ring, clamping ring, and limiting component. The inverted conical sealing surface design of the sealing ring enables it to generate uniform radial sealing pressure when the clamping ring applies axial force, forming a reliable surface seal with the surface of the workpiece being tested, rather than a traditional line seal or point seal, which greatly improves the sealing reliability and airtightness performance. The threaded adjustment mechanism of the clamping ring allows the operator to flexibly adjust the clamping force according to the actual size of the workpiece being tested and the sealing requirements, adapting to workpieces of different diameters and surface conditions. The setting of the limiting component effectively prevents the sealing ring from axially dislodging and shifting during use. The offset design ensures stable sealing performance even after repeated use. The overall structure is compact and reasonable, and installation and disassembly are simple and quick. A single person can complete the connection and locking of the joint in seconds. Compared with traditional joints that require multiple fasteners and complex operation steps, it greatly improves work efficiency. The sealing ring is made of elastic material with good resilience and wear resistance, and can maintain good sealing effect even after thousands of repeated uses, significantly reducing maintenance costs and replacement frequency. The locking sleeve body and the clamping ring are made of high-strength corrosion-resistant material, which can adapt to various harsh working environments. This device is particularly suitable for airtightness testing of automotive parts, pipeline systems, valves, pressure vessels and other products, providing a highly efficient, reliable and economical airtightness testing connection solution for modern manufacturing industry. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a self-sealing airtightness testing quick-connect locking sleeve device;

[0029] Figure 2 This is a schematic diagram of the inner wall structure of the sealing ring;

[0030] Figure 3 This is a schematic diagram of the outer wall of the clamping ring;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Locking sleeve body; 20. Sealing ring; 30. Pressing ring; 40. Limiting component. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The diagram shows a structural schematic of a self-sealing airtightness testing quick-connect locking sleeve device provided by this utility model. In the diagram, it is used to connect the airtightness testing equipment and the workpiece under test. It includes a locking sleeve body 10, a sealing ring 20, a clamping ring 30, and a limiting member 40. The locking sleeve body has a cylindrical structure, and its inner wall is provided with a threaded section and a smooth section along the circumference. The threaded section is located at one end of the locking sleeve body, and the smooth section is located at the other end. The sealing ring is disposed inside the locking sleeve body and is annular in shape. The structure comprises a sealing ring whose outer diameter matches the inner diameter of the smooth section of the locking sleeve body, and an inverted conical sealing surface on the inner wall of the sealing ring; a clamping ring positioned between the sealing ring and the threaded section, the clamping ring having an annular structure, an external thread on the outer wall of the clamping ring that mates with the threaded section, and a pushing surface on the inner side of the clamping ring that is in close contact with the outer surface of the sealing ring; and a limiting member positioned at the end of the smooth section of the locking sleeve body, the limiting member having an annular boss structure, the inner diameter of the limiting member being smaller than the outer diameter of the sealing ring, used to restrict the axial movement of the sealing ring.

[0035] In the above technical solution, the cone angle of the inverted conical sealing surface of the sealing ring is 15~30°, and the inverted conical sealing surface gradually expands from the front end to the rear end of the sealing ring.

[0036] Furthermore, in the above technical solution, the pressing surface of the clamping ring has a conical structure, and the cone angle of the conical pressing surface matches the chamfer of the outer side of the sealing ring, forming a surface contact between the two.

[0037] Furthermore, in the above technical solution, the length of the threaded section of the locking sleeve body accounts for 1 / 2 to 2 / 3 of the total length of the locking sleeve body along the axial direction, and the thread of the threaded section is a trapezoidal thread or a triangular thread.

[0038] Furthermore, in the above technical solution, the outer surface of the sealing ring is provided with an annular groove, which extends along the circumference of the sealing ring, and the front end of the pressing face of the pressing ring is provided with an annular protrusion that cooperates with the annular groove.

[0039] Furthermore, in the above technical solution, the connection between the limiting member and the smooth section of the locking sleeve body has an arc transition structure, and the radius of curvature of the arc transition structure is half to twice the height of the limiting member boss.

[0040] Furthermore, in the above technical solution, the inner wall of the smooth section of the locking sleeve body is provided with a plurality of axially extending guide grooves, the guide grooves having a rectangular or trapezoidal cross section, and the outer side of the sealing ring is provided with guide protrusions that cooperate with the guide grooves.

[0041] Furthermore, in the above technical solution, the pitch of the external thread of the clamping ring is equal to the pitch of the thread section of the locking sleeve body, and the rear end face of the clamping ring is provided with multiple anti-slip patterns evenly distributed along the circumference, the anti-slip patterns being radially or grid-like.

[0042] Furthermore, in the above technical solution, the sealing ring is made of rubber or polyurethane, the locking sleeve body and the clamping ring are made of stainless steel or aluminum alloy, and the limiting component and the locking sleeve body are integrally formed.

[0043] Furthermore, in the above technical solution, the surface roughness of the inverted conical sealing surface of the sealing ring is less than the surface roughness of the pressing surface of the compression ring, and the radial thickness of the sealing ring gradually increases from the front end to the rear end along the axial direction, with the radial thickness at the rear end of the sealing ring being greater than that at the front end.

[0044] The following is a specific embodiment 1 of this utility model. This embodiment is used for airtightness testing of the intake manifold of an automobile engine. The locking sleeve body is made of 304 stainless steel, with an outer diameter of 80mm, an inner diameter of 65mm, and a total length of 100mm. The inner wall of the locking sleeve body is divided into two sections: the front section is a smooth section with a length of 40mm and an inner diameter of 65mm, and the rear section is a threaded section with a length of 60mm and an inner diameter of 65mm. The thread is an M65*1.5 trapezoidal thread. The smooth section and the threaded section are connected by a transition through a change in diameter. The end of the smooth section forms an annular boss, i.e., a limiting member, with an inner diameter of 58mm and a boss height of 3mm. The connection between the limiting member and the inner wall of the smooth section is provided with an arc transition with a radius of 4mm. Four guide grooves are evenly distributed circumferentially on the inner wall of the smooth section. Each guide groove extends 35mm axially, is 3mm wide, and 2mm deep, with a rectangular cross-section. The sealing ring is made of nitrile rubber with a Shore A70 hardness. The sealing ring has an annular structure with an outer diameter of 64mm, an inner diameter of 60mm, and an axial length of 25mm. The radial thickness at the front end of the sealing ring is 2mm, and the radial thickness at the rear end is 3.5mm. The inner wall of the sealing ring has an inverted conical sealing surface with a cone angle of 22 degrees. The sealing surface gradually expands from the 60mm inner diameter at the front end to the 64mm inner diameter at the rear end. The outer surface of the sealing ring has an annular groove with a width of 5mm and a depth of 1.5mm, located at the axial center of the sealing ring. The outer surface of the sealing ring also has... The locking ring is equipped with four guide protrusions that mate with the guide grooves of the locking sleeve body. Each protrusion is 2.8mm wide, 1.8mm high, and extends 20mm axially. The clamping ring is made of 6061 aluminum alloy, has an annular structure with an outer diameter of 72mm, an inner diameter of 62mm, and an axial length of 15mm. The outer wall of the clamping ring has external threads that mate with the threaded section of the locking sleeve body. The external thread specification is M65*1.5 trapezoidal thread with a pitch of 1.5mm. The inner side of the clamping ring has a conical pressing surface with a cone angle of 25° that matches the chamfer on the outer side of the sealing ring. The front end of the pressing surface has an annular protrusion with a width of 4.5mm and a height of 1.2mm for embedding into the annular groove of the sealing ring. The rear end face is equipped with 12 radially distributed anti-slip grooves, each 2mm wide and 0.8mm deep, radiating outwards from the center of the clamping ring. In use, the locking sleeve body is fitted onto the connection port of the engine intake manifold. The outer diameter of the manifold port is 60mm. The inverted conical sealing surface of the sealing ring initially contacts the outer surface of the manifold. The clamping ring is rotated so that its external thread engages with the internal thread of the locking sleeve body. A torque of 15 Nm is applied to tighten the clamping ring. The clamping ring moves 8mm axially, pushing the sealing ring forward. Under the action of axial force, the inverted conical sealing surface of the sealing ring expands radially, tightly pressing the sealing surface against the manifold surface to form a 4mm wide annular sealing band. The test pressure is 0.5 MPa, the holding time is 60 seconds, and the pressure drop does not exceed 0.The 0.01 MPa pressure meets airtightness requirements. The elastic deformation of the sealing ring fully absorbs minor unevenness on the manifold surface. The cooperation between the guide protrusion and the guide groove ensures that the sealing ring maintains coaxiality and prevents circumferential rotation during compression. The limiting component effectively prevents the sealing ring from coming off forward. The anti-slip texture of the compression ring allows operators to apply sufficient torque by hand without the need for a wrench. The entire connection process takes approximately 10 seconds, and the disassembly process takes approximately 5 seconds. After 5000 continuous uses on the production line, the sealing ring still maintains good elasticity and sealing performance, with no obvious wear or aging on the surface.

[0045] The following is another specific embodiment 2 of this utility model. Embodiment 2 is based on Embodiment 1, where the surface of the inverted conical sealing surface of the sealing ring is finely polished to a surface roughness of 0.4 μm, while the surface roughness of the pressing surface of the clamping ring is maintained at 1.6 μm. This difference in surface roughness makes the contact between the sealing surface and the workpiece under test more compact and smooth, reducing the formation of microscopic leakage channels. Simultaneously, the relatively rough surface of the pressing surface of the clamping ring increases the coefficient of friction with the outer surface of the sealing ring, preventing relative sliding or rotation of the sealing ring during clamping. The sealing ring material is changed to fluororubber with a Shore A80 hardness, which has better high-temperature resistance and oil resistance, suitable for airtightness testing of high-temperature engine components or oily environments. The depth of the annular groove of the sealing ring is increased to 2 mm, allowing the annular protrusion of the clamping ring to be embedded more deeply into the groove, further... The mechanical locking effect between the two components was enhanced, preventing axial displacement of the sealing ring during high-pressure testing. The number of guide grooves on the locking sleeve body was increased to six, and the circumferential spacing between the guide grooves was smaller, resulting in a denser distribution of guide protrusions on the sealing ring, improving guiding accuracy and anti-deflection capability. The anti-slip texture on the rear end face of the clamping ring was changed to a grid pattern, with longitudinal and transverse textures intersecting to form a 9*9 grid array. Each grid unit has a side length of 4mm and a depth of 1mm. This grid pattern provides greater friction and better torque transmission when using tools such as wrenches. This improved design is particularly suitable for high-requirement airtightness testing applications with test pressures exceeding 1 MPa or operating temperatures exceeding 120℃. After 2000 high-pressure and high-temperature cycle tests, the sealing performance remained stable, with a pressure leakage rate of less than 0.005 MPa per minute, proving the effectiveness and reliability of the improved design.

[0046] The following is another specific embodiment 3 of this utility model. Embodiment 3 is based on Embodiment 1, with three annular microgrooves of 0.5mm depth and 1mm width arranged circumferentially on the inverted conical sealing surface of the sealing ring. These three annular microgrooves are evenly distributed axially with a spacing of 6mm. The function of the annular microgrooves is to form tiny gas buffer cavities when the sealing ring initially contacts the surface of the workpiece, allowing the sealing ring to fit the workpiece surface more evenly. Simultaneously, during the clamping process, these microgrooves are gradually flattened and closed, forming multiple sealing barrier layers, significantly improving sealing reliability. The thread type of the locking sleeve body is changed to a triangular thread with a thread specification of M65*2. The tooth angle of the triangular thread is 60 degrees, which has better self-locking performance than a trapezoidal thread, making it suitable for testing occasions where a long-term clamping state is required without frequent adjustment. The axial length of the clamping ring is increased to 20mm, and the internal structure is changed to a double-layer pressing surface design. The first layer... The first layer has a 20-degree cone angle for initial contact and guidance, while the second layer has a 28-degree cone angle for final compression and sealing. This double-layer pressing surface design makes the compression process of the sealing ring smoother and more gradual, avoiding sudden compression or local overload of the sealing ring that may be caused by a single cone angle. The inner diameter of the limiting component is reduced to 56mm and the boss height is increased to 5mm, providing a stronger limiting effect and being able to withstand greater axial reaction force. It is suitable for airtightness testing of large-diameter or thick-walled workpieces. This improved solution can still maintain a good sealing effect even when there are slight ellipticity or roundness errors on the workpiece surface. Tests show that it can still achieve effective sealing for workpieces with a roundness error of 0.3mm. The pressure stability is better than that of Example 1. This solution is particularly suitable for airtightness testing of workpieces with relatively poor surface quality, such as castings or welded parts, significantly improving the adaptability and success rate of the test and reducing the number of repeated tests caused by workpiece surface defects.

[0047] Specifically, the principle of this utility model is as follows: The core of this device lies in the mechanical conversion mechanism that uses a threaded mechanism to convert rotational motion into axial thrust, and then uses an inverted conical sealing surface to convert the axial force into radial sealing pressure. When the operator rotates the clamping ring, the external thread of the clamping ring meshes with the internal thread of the locking sleeve body. Based on the lead angle and friction coefficient of the thread, the clamping ring moves forward axially and pushes the sealing ring. The inverted conical sealing surface of the sealing ring follows the wedge sealing principle. When the sealing ring is subjected to axial thrust, due to the geometry of the inverted conical surface, the axial force is decomposed into normal force and tangential force. The normal force causes the sealing ring to expand radially, and the inner wall of the sealing ring presses tightly against the outer surface of the workpiece being measured, forming a uniform annular sealing band. The magnitude of the sealing pressure is related to the axial force applied by the clamping ring, the cone angle of the inverted conical surface, and the elastic modulus of the sealing ring material. By reasonably selecting the cone angle and material parameters, sufficient radial sealing pressure can be generated under a small axial force. The sealing ring is made of elastic material, and its deformation characteristics allow... It can adapt to the microscopic unevenness of the workpiece surface, fill tiny pits and scratches, and eliminate leakage channels. Simultaneously, the resilience of the elastic material allows the sealing ring to return to its original shape after unloading, preventing permanent deformation. The limiting component provides a reaction force after the sealing ring reaches the predetermined position, preventing it from moving forward or coming off under pressure, thus ensuring the stability of the sealing ring's working position. The conical surface fit between the clamping ring and the sealing ring ensures uniform thrust transmission and avoids stress concentration. The fit between the guide groove and the guide protrusion ensures that the sealing ring does not rotate circumferentially during axial movement, maintaining the correct contact between the sealing surface and the workpiece. The entire device achieves reasonable force transmission and conversion through ingenious mechanical structure design, achieving a reliable airtight seal without the need for additional sealant or complex fasteners. This purely mechanical sealing principle makes the device simple and reliable, unaffected by temperature and chemical media, and has wide applicability and a long service life.

[0048] Before use, first check whether the locking sleeve body, sealing ring, clamping ring, and limiting component are intact. The sealing ring surface should be free of cracks, tears, or permanent deformation, and the clamping ring thread should be free of wear or damage. Clean the connecting end of the workpiece to be tested, removing surface oil, dust, and impurities, ensuring the workpiece surface is smooth without obvious scratches or pits. Insert the locking sleeve body into the connecting end of the workpiece to be tested, so that the end of the workpiece extends into the smooth section of the locking sleeve body until it contacts the limiting component. At this time, the sealing ring should be located between the workpiece surface and the clamping ring. Rotate the clamping ring by hand so that its external thread engages with the internal thread of the locking sleeve body. The initial rotation should be easy and without resistance. Continue to rotate the clamping ring clockwise. The clamping ring moves forward axially and begins to push the sealing ring. When you feel the rotational resistance gradually increasing, it means that the sealing ring has begun to contact the workpiece surface and generate sealing pressure. Continue to apply appropriate torque to rotate the clamping ring until the predetermined tightness is achieved. At this time, the inverted conical sealing surface of the sealing ring forms a tight fit with the workpiece surface. Connect the air supply line of the airtightness testing equipment to the air inlet of the workpiece. Set the test pressure and holding time according to the test procedure. Start the testing equipment and fill the workpiece with test gas. Observe the pressure gauge reading and the pressure change during the holding time. Under qualified sealing conditions, the pressure should remain stable without significant drop. After the test, turn off the air supply and release the internal pressure of the workpiece. Rotate the clamping ring counterclockwise to make it move backward along the axis. The axial pressure on the sealing ring decreases and the radial sealing force disappears. Continue to rotate the clamping ring until it is completely disengaged from the thread engagement. Remove the locking sleeve body to complete the disassembly. During use, pay attention to the rotation force of the clamping ring. It should not be too large to avoid excessive deformation of the sealing ring or indentation on the workpiece surface. It should not be too small to avoid poor sealing and leakage. It is recommended to formulate a standard operating torque value according to the workpiece material and size. After long-term use, the wear of the sealing ring should be checked regularly. When obvious wear, aging or decreased elasticity is found on the surface of the sealing ring, it should be replaced in time to ensure the reliability and accuracy of the test.

Claims

1. A self-sealing quick-connect locking sleeve device for airtightness testing, used to connect airtightness testing equipment and the workpiece to be tested, characterized in that, The device includes a locking sleeve body, a sealing ring, a pressing ring, and a limiting member. The locking sleeve body has a cylindrical structure, and its inner wall has a threaded section and a smooth section along the circumference. The threaded section is located at one end of the locking sleeve body, and the smooth section is located at the other end. The sealing ring is located inside the locking sleeve body and has an annular structure. The outer diameter of the sealing ring matches the inner diameter of the smooth section of the locking sleeve body, and the inner wall of the sealing ring has an inverted conical sealing surface. The pressing ring is located between the sealing ring and the threaded section. The pressing ring has an annular structure, and its outer wall has an external thread that mates with the threaded section. The inner side of the pressing ring has a pushing surface that is in close contact with the outer side of the sealing ring. The limiting member is located at the end of the smooth section of the locking sleeve body and has an annular boss structure. The inner diameter of the limiting member is smaller than the outer diameter of the sealing ring, and it is used to restrict the axial movement of the sealing ring.

2. The self-sealing airtightness testing quick connector locking sleeve device according to claim 1, characterized in that, The cone angle of the inverted conical sealing surface of the sealing ring is 15~30°, and the inverted conical sealing surface gradually expands from the front end to the rear end of the sealing ring.

3. The self-sealing airtightness testing quick connector locking sleeve device according to claim 2, characterized in that, The pressing surface of the compression ring has a conical structure, and the cone angle of the conical pressing surface matches the chamfer of the outer side of the sealing ring, forming a surface contact between the two.

4. The self-sealing airtightness testing quick connector locking sleeve device according to claim 3, characterized in that, The threaded section of the locking sleeve body accounts for 1 / 2 to 2 / 3 of the total length of the locking sleeve body along the axial direction, and the thread of the threaded section is a trapezoidal thread or a triangular thread.

5. The self-sealing airtightness testing quick connector locking sleeve device according to claim 4, characterized in that, The outer surface of the sealing ring is provided with an annular groove, which extends along the circumference of the sealing ring, and the front end of the pressing face of the pressing ring is provided with an annular protrusion that matches the annular groove.

6. The self-sealing airtightness testing quick connector locking sleeve device according to claim 5, characterized in that, The connection between the limiting member and the smooth section of the locking sleeve body has an arc transition structure, and the radius of curvature of the arc transition structure is half to twice the height of the limiting member boss.

7. The self-sealing airtightness testing quick connector locking sleeve device according to claim 6, characterized in that, The inner wall of the smooth section of the locking sleeve body is provided with a plurality of axially extending guide grooves. The guide grooves have a rectangular or trapezoidal cross section, and the outer side of the sealing ring is provided with guide protrusions that cooperate with the guide grooves.

8. The self-sealing airtightness testing quick connector locking sleeve device according to claim 7, characterized in that, The pitch of the external thread of the clamping ring is equal to the pitch of the thread section of the locking sleeve body. The rear end face of the clamping ring is provided with multiple anti-slip patterns evenly distributed along the circumference. The anti-slip patterns are distributed in a radial or grid pattern.

9. A self-sealing airtightness testing quick-connect locking sleeve device according to claim 8, characterized in that, The sealing ring is made of rubber or polyurethane, the locking sleeve body and the pressure ring are made of stainless steel or aluminum alloy, and the limiting component and the locking sleeve body are integrally formed.

10. A self-sealing airtightness testing quick-connect locking sleeve device according to claim 9, characterized in that, The surface roughness of the inverted conical sealing surface of the sealing ring is less than that of the pressing surface of the compression ring. The radial thickness of the sealing ring gradually increases from the front end to the rear end along the axial direction, and the radial thickness of the rear end of the sealing ring is greater than that of the front end.

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