D-shaped ring with auxiliary ears and sealing structure for a piston actuator

Abstract

The utility model relates to piston type actuating mechanism sealing technology, has shown a kind of piston type actuating mechanism with the D type ring of auxiliary ear and sealing structure, including D type sealing ring, first auxiliary ear, second auxiliary ear and metal framework, the two sides of D type sealing ring are equipped with first auxiliary ear and second auxiliary ear, metal framework is located inside D type sealing ring, glue hole is equipped on metal framework, and rubber under the fluid state is passed through glue hole, and rubber is evenly distributed on the two sides of D type sealing ring two sides of metal framework, by adding auxiliary ear structure on the two sides of D type sealing ring, form grease storage cavity, when piston moves, first auxiliary ear and second auxiliary ear will lubricating grease be limited between D type ring sealing surface and auxiliary ear, realize sustained lubrication, avoid lubricating grease to accumulate in both ends of stroke, ensure that middle stroke area lubrication is sufficient, reduce the leakage problem caused by D type sealing ring abrasion, improve the reliability and stability of actuating mechanism.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for piston actuators, and more specifically, to a D-ring with auxiliary lugs and sealing structure for a piston actuator. Background Technology

[0002] In traditional linear piston pneumatic actuators, a combination of O-rings and guide bands or a single O-ring is typically used. However, this design has significant drawbacks. During the piston's reciprocating motion, the O-ring and guide band scrape the grease from the cylinder wall to the two ends of the stroke (maximum / minimum positions), resulting in insufficient lubrication in the middle stroke area. This lack of grease accelerates the friction between the O-ring and the cylinder wall, leading to wear, leakage, and other problems. This not only shortens the lifespan of the O-ring but also reduces the reliability of the actuator. To address this issue, a novel sealing structure is proposed: a D-ring with auxiliary lugs and a sealing structure for piston actuators. Utility Model Content

[0003] This application provides a D-ring and sealing structure with auxiliary lugs for a piston actuator, which solves the problem that in the existing process of piston reciprocating motion, the O-ring and guide band scrape the grease on the cylinder wall to both ends of the stroke (maximum / minimum position), resulting in insufficient lubrication in the middle stroke area. The lack of grease will accelerate the friction between the sealing ring and the cylinder wall, thereby causing wear, leakage and other problems.

[0004] This application provides a D-ring with auxiliary ears for a piston actuator, including a D-ring seal, a first auxiliary ear, a second auxiliary ear, and a metal frame. The first auxiliary ear and the second auxiliary ear are provided on both sides of the D-ring seal. The metal frame is located inside the D-ring seal and has a glue flow hole. Rubber in a fluid state passes through the glue flow hole and is evenly distributed on both sides of the metal frame on both sides of the D-ring seal.

[0005] Preferably, the first auxiliary ear and the second auxiliary ear form a first storage cavity and a second storage cavity between themselves and the arcuate sealing surface of the D-shaped sealing ring.

[0006] Preferably, the rubber is an oil-resistant rubber material.

[0007] Preferably, the metal skeleton of the D-type sealing ring is made of a high-strength, corrosion-resistant metal material.

[0008] Preferably, the D-type sealing ring is installed in the sealing ring groove on the piston.

[0009] Preferably, the arc-shaped sealing surface of the D-type sealing ring compresses and seals with the inner wall of the cylinder.

[0010] A piston actuator sealing structure further includes a lower end cap and an O-ring.

[0011] As can be seen from the above technical solutions, this application provides a D-ring with auxiliary ears and a sealing structure for a piston actuator. During actual operation, when the piston reciprocates in the cylinder, the first and second auxiliary ears scrape the grease on the cylinder wall as the piston moves. However, due to the design of the first and second storage chambers, the grease is confined between the arc sealing surface of the D-ring and the first and second auxiliary ears, and will not be scraped to the two ends of the stroke. This ensures that the arc sealing surface of the D-ring is continuously lubricated throughout the entire stroke of the piston, effectively reducing friction between the D-ring and the cylinder wall, reducing wear, extending the service life of the D-ring, and improving the reliability and stability of the piston pneumatic actuator. At the same time, the metal skeleton of the D-ring undertakes part of the guiding function, reducing the dependence on independent guide belts, simplifying the overall structure, and reducing production costs.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adds auxiliary ear structures on both sides of the D-type sealing ring to form a grease storage cavity. When the piston moves, the first auxiliary ear and the second auxiliary ear restrict the grease between the sealing surface of the D-type ring and the auxiliary ear, so as to achieve continuous lubrication, avoid the accumulation of grease at both ends of the stroke, and ensure sufficient lubrication in the middle stroke area.

[0013] 2. The uniform distribution of the grease in this invention reduces friction between the D-type seal ring and the cylinder inner wall, effectively reducing wear and thus extending the service life of the D-type seal ring.

[0014] 3. This utility model reduces leakage problems caused by wear of the D-type sealing ring, and improves the reliability and stability of the actuator.

[0015] 4. The metal skeleton of the D-type sealing ring of this utility model undertakes part of the guiding function, reducing the dependence on independent guide strips and simplifying the overall structure.

[0016] In summary, a piston actuator with a D-ring and sealing structure featuring auxiliary ears creates a grease storage cavity by adding auxiliary ear structures on both sides of the D-ring. During piston movement, the first and second auxiliary ears confine the grease between the D-ring sealing surface and the auxiliary ears, achieving continuous lubrication, preventing grease buildup at both ends of the stroke, ensuring sufficient lubrication in the middle stroke area, reducing leakage problems caused by D-ring wear, and improving the reliability and stability of the actuator. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 A cross-sectional view of a D-ring with auxiliary lugs for a piston actuator provided by this utility model; Figure 2 A schematic diagram of a D-ring and sealing structure with auxiliary lugs for a piston actuator provided by this utility model; Figure 3 A schematic diagram of a D-ring with auxiliary lugs for a piston actuator provided by this utility model; Figure 4 A schematic diagram of the metal skeleton of the D-shaped sealing ring in a D-shaped ring with auxiliary lugs for a piston actuator provided by this utility model; Figure 5 This is a partial schematic diagram of the metal skeleton of the D-shaped sealing ring in a D-shaped ring with auxiliary lugs for a piston actuator provided by this utility model.

[0019] The reference numerals in the detailed embodiments are as follows: 1. Lower end cap; 2. O-ring; 3. First storage chamber; 4. D-type sealing ring; 5. Second storage chamber; 6. Cylinder; 7. Piston; 8. First auxiliary ear; 9. Metal frame; 10. Rubber; 11. Glue flow hole; 12. Second auxiliary ear; 13. Sealing ring groove. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0021] See Figure 1-5This application discloses a D-ring and sealing structure with auxiliary ears for a piston actuator. To address the problem that in existing piston reciprocating motion, O-rings and guide bands scrape grease from the cylinder wall to the two ends of the stroke (maximum / minimum positions), resulting in insufficient lubrication in the middle stroke area. This lack of grease accelerates friction between the sealing ring and the cylinder wall, leading to wear and leakage. The proposed solution involves adding auxiliary ears to both sides of the D-ring to form a grease storage cavity. During piston movement, the first and second auxiliary ears confine the grease between the D-ring sealing surface and the auxiliary ears, achieving continuous lubrication, preventing grease accumulation at the two ends of the stroke, ensuring sufficient lubrication in the middle stroke area, reducing leakage caused by D-ring wear, and improving the reliability and stability of the actuator.

[0022] Specifically, a piston actuator with an auxiliary lug, a D-ring, and a sealing structure include a lower end cover 1, an O-ring 2, a D-ring 4, a first auxiliary lug 8, a second auxiliary lug 12, and a metal frame 9. The D-ring 4 is installed in a sealing groove 13 on the piston 7. The arc-shaped sealing surface of the D-ring 4 compresses and seals against the inner wall of the cylinder 6. The D-ring on the piston 6 is used for dynamic sealing to prevent rollover. An O-ring 2 is installed between the upper end cover 1 and the cylinder 6. The upper end cover 1 and the cylinder 6 are statically sealed by the O-ring 2. The upper and lower end covers assemble the cylinder 6 onto the piston 7. When the piston 7 moves, the first auxiliary ear 8 and the second auxiliary ear 12 on the D-type sealing ring 4 are compressed and pushed to both sides. The first auxiliary ear 8 and the second auxiliary ear 12 are provided on both sides of the D-type sealing ring 4. The shape and size of the first auxiliary ear 8 and the second auxiliary ear 12 match the inner wall of the cylinder 6 to ensure that the first auxiliary ear 8 and the second auxiliary ear 12 can fit tightly against the inner wall of the cylinder during the movement of the piston 7, so as to achieve good sealing and lubrication effect. The first auxiliary ear 8 and the second auxiliary ear 12 form the first storage cavity 3 and the second storage cavity 4 between the first auxiliary ear 8 and the second auxiliary ear 12 and the arc sealing surface of the D-type sealing ring 4. The ends of the cavity 5, the first auxiliary ear 8, and the second auxiliary ear 12 are designed with chamfers or rounded corners to reduce friction and wear during assembly and improve sealing performance. The metal skeleton 9 is located inside the D-type sealing ring 4. Under the elastic force of the metal skeleton 9, the highest arc of the first auxiliary ear 8 and the second auxiliary ear 12 is 2mm higher than the highest arc sealing surface of the D-type sealing ring 4. The metal skeleton 9 of the D-type sealing ring 4 is made of high-strength, corrosion-resistant metal material to improve the structural strength and service life of the D-type sealing ring. The shape and size of the metal skeleton 9 can be adjusted according to the specific design of the cylinder 6 and the piston 7 to ensure the best support and sealing effect. The metal skeleton 9 is provided with a glue flow hole 11. The rubber 10 in the fluid state passes through the glue flow hole 11 to the two sides of the metal skeleton 9 on both sides of the D-type sealing ring 4, and the rubber 10 is evenly distributed on both sides. The thickness of the rubber 10 layer of the D-type sealing ring 4 can be different in different parts to adapt to different sealing and guiding requirements. In particular, the thickness can be appropriately increased in the sealing surface and auxiliary ear parts. The rubber 10 is made of oil-resistant rubber material to adapt to the working environment of the pneumatic actuator. The metal skeleton 9 is placed in the mold for producing the D-type sealing ring 4. Rubber 10, in a fluid state, passes through the flow holes 11 on the metal skeleton 9. Rubber 10 is evenly vulcanized on both sides of the metal skeleton 9 on both sides of the D-type sealing ring 4. After the rubber 10 cools, the D-type sealing ring 4, composed of the metal skeleton 9 and rubber 10, is obtained. The D-type sealing ring 4 is fitted into the sealing ring groove 13 machined on the piston 7. Lubricant is then applied to the first storage chamber 3 and the second storage chamber 5 of the D-type sealing ring 4. The cylinder 6 is assembled onto the piston 7. The cylinder 6 compresses and pushes the first auxiliary ear 8 and the second auxiliary ear 12 on the D-type sealing ring 4 to both sides. At the first auxiliary ear 8 and the second auxiliary ear 12, the metal skeleton... Under the elastic force of 9, the two auxiliary ears will be tightly pressed against the inner wall of the cylinder 6 on both sides of the arc sealing surface of the D-type sealing ring 4. During the operation of the piston 7, the D-type sealing ring 4 restricts the grease in the first storage chamber 3 and the second storage chamber 5 between the sealing surface of the D-type ring and the first auxiliary ear 8 and the second auxiliary ear 12, respectively, to achieve continuous lubrication. The metal skeleton 9 in the middle of the first auxiliary ear 8 and the second auxiliary ear 12 provides the elastic force of the auxiliary ears, so that the first auxiliary ear 8 and the second auxiliary ear 12 are dynamically fitted with the cylinder 6 wall, reducing grease leakage. The metal skeleton 9 of the D-type sealing ring 4 undertakes part of the guiding function, reducing the dependence on the independent guide strip. The rubber sealing surface 10 provides radial sealing to prevent gas leakage.

[0023] As can be seen from the above technical solution, in actual operation, when the piston 7 reciprocates within the cylinder 6, the first auxiliary ear 8 and the second auxiliary ear 12 scrape the grease on the inner wall of the cylinder 6 as the piston 7 moves. However, due to the design of the first storage chamber 3 and the second storage chamber 5, the grease is confined between the arc sealing surface of the D-type sealing ring 4 and the first auxiliary ear 8 and the second auxiliary ear 12, and will not be scraped to the two ends of the stroke. This ensures that the arc sealing surface of the D-type sealing ring 4 is continuously lubricated throughout the entire stroke range of the piston 7, effectively reducing the friction between the D-type sealing ring 4 and the inner wall of the cylinder 6, reducing wear, extending the service life of the D-type sealing ring 4, and improving the reliability and stability of the piston-type pneumatic actuator. At the same time, the metal skeleton 9 of the D-type sealing ring 4 undertakes part of the guiding function, reducing the dependence on independent guide belts, simplifying the overall structure, and reducing production costs.

[0024] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0025] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A D-ring with auxiliary lugs for a piston actuator, characterized in that: It includes a D-type sealing ring (4), a first auxiliary ear (8), a second auxiliary ear (12) and a metal skeleton (9). The first auxiliary ear (8) and the second auxiliary ear (12) are provided on both sides of the D-type sealing ring (4). The metal skeleton (9) is located inside the D-type sealing ring (4). The metal skeleton (9) is provided with a glue flow hole (11). Rubber (10) in a fluid state passes through the glue flow hole (11) to the two sides of the metal skeleton (9) on both sides of the D-type sealing ring (4) where the rubber (10) is evenly distributed.

2. A D-ring with auxiliary lugs for a piston actuator according to claim 1, characterized in that: The first auxiliary ear (8) and the second auxiliary ear (12) form a first storage cavity (3) and a second storage cavity (5) between the arc sealing surface of the D-type sealing ring (4).

3. A D-ring with auxiliary lugs for a piston actuator according to claim 1, characterized in that: The rubber (10) is made of oil-resistant rubber material.

4. A D-ring with auxiliary lugs for a piston actuator according to claim 1, characterized in that: The metal skeleton (9) of the D-type sealing ring (4) is made of high-strength, corrosion-resistant metal material.

5. A D-ring with auxiliary lugs for a piston actuator according to claim 1, characterized in that: The D-type sealing ring (4) is installed in the sealing ring groove (13) on the piston (7).

6. A D-ring with auxiliary lugs for a piston actuator according to claim 1, characterized in that: The arc sealing surface of the D-type sealing ring (4) compresses and seals with the inner wall of the cylinder (6).

7. A sealing structure for a piston actuator, comprising a D-ring with auxiliary lugs for a piston actuator as described in any one of claims 1-6, characterized in that: It also includes a lower end cap (1) and an O-ring (2).

Images