High performance aerodynamic seal

Abstract

The utility model provides a high -performance pneumatic sealing element, including cylinder body, the cylinder body fixed mounting has seal cover, the cylinder body inside swing installation has gas rod, seal cover is equipped with assembly seat, and assembly seat is equipped with assembly cavity and through -hole, and gas rod passes through the through -hole, and assembly cavity fixed mounting has sealing element, and assembly cavity is equipped with fixed rib, and sealing element is equipped with V type ring groove, and V type ring groove divides sealing element into fixed part and sealing part, and sealing part and gas rod seal swing contact, and sealing element inside fixedly connected with V type spring piece. The utility model discloses sealing element is fixed by V type ring groove fixed part and sealing part, and sealing element inside fixed with V type spring piece, and V type spring piece elasticity acts on sealing part, makes sealing part when non -positive air pressure can tightly adhere gas rod, guarantees air -tightness, when operating, positive air pressure acts on sealing element, and V type ring groove makes positive air pressure act on sealing part, further makes sealing part tightly adhere gas rod, improves the air -tightness of gas rod movement.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic sealing technology, specifically relating to high-performance pneumatic seals. Background Technology

[0002] In pneumatic transmission systems, the movement of the air rod creates a gap between the cylinder and the air rod. High-performance pneumatic seals are needed to seal this gap and prevent leakage. Currently, commonly used high-performance pneumatic seals, such as circular and square sealing rings, are widely used in both dynamic and static sealing applications of pneumatic transmission systems due to their advantages, including simple structure, ease of manufacturing, and low cost. However, existing dynamic sealing elements still have certain shortcomings in terms of airtightness.

[0003] Chinese utility model patent CN219013355U belongs to the field of pneumatic sealing technology, particularly high-performance pneumatic seals. It includes a cylinder body with a side cover fixed to one end. A piston moves within the cylinder body, and a mounting shell is threaded onto the side cover. A first sealing ring and a second sealing ring are fixed to the inner wall of the mounting shell. This utility model initially fixes the mounting shell through the threaded connection between the mounting shell and the side cover. With the addition of a limiting mechanism, the mounting shell is further limited, thus fixing the first and second sealing rings. This double fixation prevents displacement and slippage of the first and second sealing rings during use. Furthermore, the limiting mechanism allows for the disassembly and replacement of the mounting shell, first sealing ring, and second sealing ring. The anti-corrosion and wear-resistant layers enhance the corrosion and wear resistance of the first and second sealing rings, reducing the likelihood of damage after prolonged friction. However, it still has certain shortcomings in terms of airtightness. Utility Model Content

[0004] The purpose of this invention is to provide a high-performance pneumatic seal to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-performance pneumatic seal, comprising a cylinder body, a sealing cover fixedly mounted on the cylinder body, a pneumatic rod movably mounted inside the cylinder body, an assembly seat provided on the sealing cover, an assembly cavity and a through hole provided on the assembly seat, the pneumatic rod passing through the through hole, a seal fixedly mounted on the assembly cavity, a fixing rib provided on the assembly cavity, a V-shaped annular groove provided on the seal, the V-shaped annular groove dividing the seal into a fixing part and a sealing part, the sealing part being in sealing contact with the pneumatic rod, and a V-shaped spring sheet fixedly connected inside the seal.

[0006] Preferably, the sealing part is provided with an annular groove.

[0007] Preferably, the V-shaped spring is made of stainless steel.

[0008] Preferably, the fixing rib has an inclined surface.

[0009] Preferably, the sealing element is fixedly connected to the V-shaped spring sheet by an insert injection molding process.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The sealing element of this utility model consists of a V-shaped annular groove fixing part and a sealing part. A V-shaped spring is fixed inside the sealing element. The V-shaped spring acts elastically on the sealing part, so that the sealing part can tightly fit the air rod when there is no positive air pressure, ensuring airtightness. During operation, when positive air pressure is applied to the sealing element, the V-shaped annular groove makes the positive air pressure act on the sealing part, further making the sealing part tightly fit the air rod, improving the airtightness when the air rod moves. Attached Figure Description

[0012] Figure 1 This is a structural view of the present invention.

[0013] Figure 2 This is a structural view of the sealing cap of this utility model.

[0014] Figure 3 This is a cross-sectional structural view of the sealing cap of this utility model.

[0015] Figure 4 This is a structural view of the sealing component of this utility model.

[0016] The diagram is labeled as follows: 1. Cylinder body; 2. Sealing cap; 3. Air rod; 4. Assembly seat; 5. Assembly cavity; 6. Through hole; 7. Seal; 8. Fixing rib; 9. V-shaped annular groove; 10. Fixing part; 11. Sealing part; 12. V-shaped spring; 13. Annular groove; 14. Inclined surface. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1:

[0019] This utility model provides a high-performance pneumatic seal, comprising a cylinder body 1, a sealing cover 2 fixedly mounted on the cylinder body 1, a pneumatic rod 3 movably mounted inside the cylinder body 1, a mounting base 4 on the sealing cover 2, a mounting cavity 5 and a through hole 6 on the mounting base 4, the pneumatic rod 3 passing through the through hole 6, a seal 7 fixedly mounted on the mounting cavity 5, a fixing rib 8 on the mounting cavity 5, and a V-shaped annular groove 9 on the seal 7, dividing the seal 7 into a fixing part 10 and a sealing part 11. The sealing part 11 is in sealing contact with the pneumatic rod 3, and a V-shaped spring 12 is fixedly connected inside the seal 7. The sealing part 11 has an annular groove 13. The V-shaped spring 12 is made of stainless steel. The fixing rib 8 has a bevel 14. The seal 7 is fixedly connected to the V-shaped spring 12 by an insert injection molding process.

[0020] Through the above technical solution, the sealing element 7 of this utility model is fixed by the V-shaped annular groove 9 and the sealing part 10 and the sealing part 11. A V-shaped spring piece 12 is fixed inside the sealing element 7. The V-shaped spring piece 12 elastically acts on the sealing part 11, so that the sealing part 11 can tightly fit the air rod 3 when there is no positive air pressure, ensuring air tightness. When positive air pressure is applied to the sealing element 7 during operation, the V-shaped annular groove 9 makes the positive air pressure act on the sealing part 11, further making the sealing part 11 tightly fit the air rod 3, improving the air tightness when the air rod 3 moves.

[0021] Example 2:

[0022] In this embodiment, the seal 7 is installed between the cylinder body 1 and the air rod 3 to prevent media leakage. The cylinder body 1 is fixedly equipped with a sealing cover 2, and the air rod 3 reciprocates inside the cylinder body 1. The sealing cover 2 is provided with a mounting base 4, and a mounting cavity 5 is formed inside the mounting base 4. The mounting cavity 5 communicates with the outside through a through hole 6, through which the air rod 3 moves.

[0023] The assembly cavity 5 is equipped with fixing ribs 8, which are evenly distributed around the circumference of the assembly cavity 5 to fix the position of the sealing element 7. The sealing element 7 adopts a special structural design, and its outer surface fits tightly with the inner wall of the assembly cavity 5. A V-shaped annular groove 9 is provided in the middle of the sealing element 7, which divides the sealing element 7 into two functional areas: a fixing part 10 and a sealing part 11. The fixing part 10 cooperates with the fixing ribs 8 in the assembly cavity 5 to ensure the stable fixation of the sealing element 7 within the assembly cavity 5.

[0024] The sealing part 11 is located inside the V-shaped annular groove 9 and directly contacts the outer surface of the air rod 3. The inner edge of the sealing part 11 is designed as a flexible contact surface to maintain continuous contact during the movement of the air rod 3. A V-shaped spring 12 is embedded inside the sealing member 7, which is located between the fixing part 10 and the sealing part 11 of the sealing member 7. The two elastic arms of the V-shaped spring 12 act on different positions of the sealing part 11, providing uniform elastic support.

[0025] When the system is not in operation, the elastic force of the V-shaped spring 12 maintains the initial contact pressure between the sealing part 11 and the air rod 3. This preload ensures a basic sealing effect before the system is started. When the system is in operation, air pressure acts on the V-shaped annular groove 9 area of ​​the seal 7. The air pressure is transmitted through the inclined surface 14 of the V-shaped annular groove 9 and converted into radial pressure on the sealing part 11, making the sealing part 11 fit more tightly against the surface of the air rod 3.

[0026] During the movement of the air spring 3, the flexible contact surface of the sealing part 11 adaptively adjusts to the surface shape of the air spring 3. The elastic characteristics of the V-shaped spring 12 allow the sealing part 11 to follow the radial movement of the air spring 3 within a certain range, maintaining the sealing effect. When the air pressure changes, the V-shaped annular groove 9 structure converts the air pressure change into a corresponding adjustment of the sealing contact pressure, achieving dynamic sealing.

[0027] The sealing structure exhibits excellent responsiveness during the reciprocating motion of the pneumatic rod 3. The material selection for the sealing part 11 takes into account the balance between wear resistance and elastic modulus to ensure sealing performance under long-term use. The material and angle design of the V-shaped spring 12 enable it to provide stable elastic restoring force without causing excessive resistance to the movement of the pneumatic rod 3.

[0028] The fixing rib 8 structure of the assembly cavity 5 not only serves to fix the seal 7, but also limits the deformation range of the seal 7 under high pressure. This design prevents excessive deformation of the seal 7 under extreme working conditions and extends its service life. The gap between the through hole 6 and the air rod 3 is precisely calculated to ensure smooth movement of the air rod 3 and to provide the seal 7 with an optimal working environment.

[0029] The sealing structure in this embodiment achieves efficient sealing during the movement of the air rod 3 through the synergistic effect of mechanical elasticity and air pressure. The special structure of the V-shaped annular groove 9 converts axial air pressure into radial sealing force, improving sealing efficiency. The entire system maintains good sealing performance under various operating conditions, solving the problem of insufficient airtightness of traditional seals 7.

[0030] Example 3:

[0031] In this embodiment, a sealing cover 2 is fixedly installed on the cylinder body 1, and a piston rod 3 is movably installed inside the cylinder body 1. The sealing cover 2 is provided with a mounting base 4, and the mounting base 4 forms a mounting cavity 5 and has a through hole 6 for the piston rod 3 to pass through. A sealing element 7 is fixedly installed in the mounting cavity 5 by a fixing rib 8.

[0032] The seal 7 employs a special structural design, with a V-shaped spring piece 12 fixedly connected internally and a V-shaped annular groove 9 externally. The V-shaped annular groove 9 divides the seal 7 into two parts: a fixing part 10 and a sealing part 11. The fixing part 10 is firmly fixed in the assembly cavity 5 by a fixing rib 8, while the sealing part 11 maintains sealed contact with the air rod 3. The contact surface of the sealing part 11 is provided with an annular groove 13.

[0033] The design principle of the annular groove 13 is to effectively reduce the frictional resistance between the sealing part 11 and the air rod 3 by reducing the actual contact area between them. When the air rod 3 reciprocates within the cylinder 1, the intermittent contact pattern formed by the annular groove 13 can significantly reduce sliding friction while maintaining sufficient sealing pressure. The elastic force provided by the V-shaped spring 12 ensures that the sealing part 11 always applies appropriate contact pressure to the air rod 3.

[0034] When the pneumatic system is operating, the positive air pressure acting on the seal 7 converts the air pressure into radial pressure on the sealing part 11 through the special structure of the V-shaped annular groove 9, further enhancing the sealing effect. The presence of the annular groove 13 allows this pressure to be distributed more evenly on the sealing contact surface, avoiding excessive wear caused by excessive local pressure. When the air pressure changes, the elastic deformation of the V-shaped spring 12 can automatically adjust the contact state between the sealing part 11 and the air rod 3, ensuring sealing reliability under different operating conditions.

[0035] The fixing part 10 of the seal 7 is firmly fixed in the assembly cavity 5 by the fixing rib 8 to prevent the seal 7 from shifting under air pressure. The annular groove 13 structure of the sealing part 11 not only reduces friction, but also forms multiple micro sealing rings. These rings form a stepped sealing effect when the air rod 3 moves, effectively preventing media leakage. The elastic support of the V-shaped spring 12 allows the sealing part 11 to adapt to the slight wobble and surface unevenness of the air rod 3, maintaining stable sealing performance.

[0036] The seal 7 of this embodiment is particularly suitable for pneumatic transmission systems requiring frequent reciprocating motion. The friction-reducing design of the annular groove 13 extends the service life of the seal 7, while the synergistic effect of the V-shaped spring 12 and the V-shaped annular groove 9 ensures excellent airtightness. The overall structure of the seal 7 is simple and reliable, easy to install and maintain, and can meet the sealing requirements of high-performance pneumatic systems.

[0037] Example 4:

[0038] In this embodiment, the sealing element 7 employs a special structural design to achieve excellent airtight performance. The sealing element 7 is divided into two functional areas, a fixing part 10 and a sealing part 11, by a V-shaped annular groove 9. The fixing part 10 cooperates with the fixing rib 8 of the assembly cavity 5 to achieve stable installation, while the sealing part 11 is responsible for forming a dynamic sealing contact with the air rod 3. A V-shaped spring 12, made of stainless steel, is embedded inside the sealing element 7. Through its unique elastic properties, the spring provides continuous radial pressure to the sealing part 11.

[0039] The selection of stainless steel for the V-shaped spring 12 is of significant technical importance. Stainless steel possesses excellent elastic modulus and fatigue resistance, maintaining stable elastic properties during long-term reciprocating motion. During the operation of the seal 7, when the system is under non-positive pressure, the elastic restoring force of the V-shaped spring 12 forces the sealing part 11 to contract inward, ensuring tight contact with the surface of the air rod 3 and preventing media leakage. This design effectively solves the problem of decreased sealing performance of traditional seals 7 under low-pressure or negative-pressure conditions.

[0040] The connection between the seal 7 and the V-shaped spring 12 is achieved using an insert injection molding process. During manufacturing, the pre-formed stainless steel V-shaped spring 12 is precisely placed into the mold cavity, and then sealing material is injected to encapsulate it. This process ensures a strong mechanical bond between the V-shaped spring 12 and the seal 7 substrate, while maintaining free movement space for the spring. The advantage of insert injection molding is that it allows for the one-time molding of complex structures, avoiding potential precision loss during subsequent assembly.

[0041] When positive air pressure is introduced into the system, the air pressure is transmitted to the sealing part 11 through the special structure of the V-shaped annular groove 9. The air pressure acts on the inside of the sealing part 11, working synergistically with the elastic force of the V-shaped spring 12 to enhance the clamping force of the sealing part 11 on the air rod 3. This dual-action mechanism allows the sealing performance to automatically increase as the system pressure rises, achieving a self-tightening sealing effect. The structural design of the V-shaped annular groove 9 is crucial; it serves as both a pressure transmission channel and provides the necessary deformation space for the sealing part 11.

[0042] During the reciprocating motion of the pneumatic rod 3, the sealing part 11 undergoes slight deformation as the pneumatic rod 3 moves. The high resilience of the stainless steel V-shaped spring 12 ensures that the sealing part 11 can quickly adjust to the position changes of the pneumatic rod 3, maintaining good sealing contact at all times. At the same time, the corrosion resistance of the stainless steel material also ensures the long-term reliability of the seal 7 under harsh operating conditions. This design is particularly suitable for pneumatic systems that require frequent start-stop or speed-changing movements.

[0043] In this embodiment, the sealing element 7 exhibits dynamically adaptive sealing performance. During low-pressure operation, sealing is primarily achieved through the pre-tightening force of the V-shaped spring 12; as system pressure increases, air pressure gradually becomes the main source of sealing force. This force transmission mechanism allows the sealing element 7 to maintain stable sealing performance under different operating conditions, effectively solving the problem of leakage easily occurring in traditional sealing elements 7 during pressure fluctuations. The structural strength and elasticity retention of the stainless steel V-shaped spring 12 are key factors ensuring this performance.

[0044] Example 5:

[0045] In this embodiment, the fixing rib 8 has a beveled surface 14, which allows the seal 7 to be installed more smoothly into the assembly cavity 5. During assembly, the fixing part 10 of the seal 7 first contacts the beveled surface 14 of the fixing rib 8. Due to the guiding effect of the beveled surface 14, the seal 7 will undergo radial displacement along the beveled surface 14 when subjected to axial pressure, thereby smoothly sliding into the predetermined position of the assembly cavity 5. This beveled surface 14 structure effectively reduces assembly resistance and avoids possible jamming or deformation of the seal 7 during installation.

[0046] The angle of the inclined surface 14 of the fixing rib 8 is precisely calculated to ensure both sufficient guiding effect and secure fixation of the seal 7 after installation. When the seal 7 is fully inserted into the assembly cavity 5, the vertical surface of the fixing rib 8 and the fixing part 10 of the seal 7 form a tight fit, preventing axial movement of the seal 7 during use. Simultaneously, the presence of the inclined surface 14 ensures a more uniform distribution of contact stress between the seal 7 and the fixing rib 8 during assembly, avoiding damage to the seal 7 caused by localized stress concentration.

[0047] In practical applications, the inclined surface 14 design of the fixing rib 8 is particularly suitable for automated assembly lines. Because the inclined surface 14 provides excellent guiding properties, the robotic arm can press the seal 7 into the assembly cavity 5 more accurately and quickly, significantly improving production efficiency. Furthermore, the presence of the inclined surface 14 also reduces the risk of compression damage to the seal 7 material during assembly, extending the service life of the seal 7.

[0048] When the seal 7 is in operation, the inclined surface 14 of the fixing rib 8 does not affect its fixing function. When air pressure is applied to the seal 7, the elastic force of the V-shaped spring 12 works together with the air pressure to make the sealing part 11 tightly fit against the surface of the air rod 3. At this time, the fixing rib 8 mainly bears the axial load, and its inclined surface 14 structure does not weaken the fixing strength. On the contrary, because the contact between the seal 7 and the fixing rib 8 is more uniform during assembly, the overall reliability of the fixing structure is improved.

[0049] The inclined surface 14 design also facilitates the disassembly and replacement of the seal 7. When maintenance or replacement of the seal 7 is required, maintenance tools can apply force along the inclined surface 14 to smoothly remove the seal 7, avoiding the disassembly difficulties that may be caused by traditional right-angle fixing ribs 8. This maintainable design greatly reduces the maintenance cost and time of the equipment.

[0050] The inclined surface 14 of the fixing rib 8 can form a good fit with the geometry of the V-shaped annular groove 9 of the sealing element 7. Under air pressure, the deformation mode of the sealing element 7 is coordinated with the guiding of the inclined surface 14 of the fixing rib 8, ensuring that the sealing part 11 always remains in the optimal working position. This synergistic effect further improves the airtight performance of the sealing element 7 under dynamic working conditions.

[0051] It is worth mentioning that the inclined surface 14 design of the fixing rib 8 does not increase manufacturing difficulty. With proper mold design, this inclined surface 14 structure can be formed in one step during injection molding or machining, without significantly increasing production costs. This simple yet effective improvement provides an economical and practical solution for enhancing the performance of the pneumatic seal 7.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A high-performance pneumatic seal, comprising a cylinder body, a sealing cover fixedly mounted on the cylinder body, and a pneumatic rod movably mounted inside the cylinder body, characterized in that, The sealing cover is provided with an assembly base, the assembly base is provided with an assembly cavity and a through hole, the air rod passes through the through hole, a sealing element is fixedly installed in the assembly cavity, the assembly cavity is provided with a fixing rib, the sealing element is provided with a V-shaped annular groove, the V-shaped annular groove divides the sealing element into a fixing part and a sealing part, the sealing part is in sealing contact with the air rod, and a V-shaped spring is fixedly connected inside the sealing element.

2. The high-performance pneumatic seal according to claim 1, characterized in that, The sealing part is provided with an annular groove.

3. The high-performance pneumatic seal according to claim 1, characterized in that, The V-shaped spring is made of stainless steel.

4. The high-performance pneumatic seal according to claim 1, characterized in that, The fixing rib has an inclined surface.

5. The high-performance pneumatic seal according to claim 1, characterized in that, The sealing element is fixedly connected to the V-shaped spring sheet through an insert injection molding process.

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