An actuator o-ring seal assembly

Abstract

The application discloses an actuator O-ring sealing assembly and belongs to the technical field of sealing devices. The actuator comprises a cylinder barrel, the inside of the cylinder barrel is slidably connected with a piston, the surface of the piston is embedded with an O-ring and a stop ring, and the actuator O-ring sealing assembly comprises a pushing assembly, which is axially and slidably connected in the inside of the piston and in communication with the O-ring; and an expanding assembly, which is radially and slidably connected in the inside of the piston and abuts against the inner wall of the stop ring at the end of the expanding assembly. In the application, when the pressure in the cylinder barrel increases, the rotating barrel drives the helical groove to rotate, the ejector rod pushes the top seat to move radially under the action of the helical groove, and the top seat pushes the stop ring at the end thereof to expand. Even under high pressure and temperature for a long time, the stop ring can still be in close contact with the cylinder barrel, so that the stop ring can provide stable support for the O-ring, the O-ring is prevented from being squeezed into the gap, the sealing performance of the O-ring is improved, and the service life of the O-ring is prolonged.

Description

Technical Field

[0001] This invention relates to the field of sealing device technology, specifically to an actuator O-ring sealing assembly. Background Technology

[0002] An actuator is a device that converts received control signals (usually electrical, pneumatic, or hydraulic) into mechanical motion.

[0003] O-rings are the most common sealing elements in actuators (such as cylinders and hydraulic cylinders). They are usually installed in grooves and undergo elastic deformation under compression after assembly to prevent internal and external leakage of fluid (oil or gas). O-rings are widely used in critical parts such as pistons and piston rods and are key components for achieving efficient and stable operation of actuators.

[0004] O-rings in actuators are prone to wear after prolonged use. A common cause of wear is that under the high pressure of compressed air, a portion of the O-ring material is squeezed into the tiny gap between the piston and cylinder. When the pressure is released, this extruded material cannot fully return to its original shape and is thus worn away, leading to permanent damage to the seal. Therefore, there is a need to provide an actuator O-ring sealing assembly designed to solve the above problems. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an actuator O-ring sealing assembly to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An actuator O-ring sealing assembly is provided. The actuator includes a cylinder barrel, and a piston is slidably connected inside the cylinder barrel. An O-ring and a retaining ring are embedded in the surface of the piston. The actuator O-ring sealing assembly includes:

[0008] The push assembly is axially slidably connected inside the piston, and its end is connected to the O-ring seal, which is used to push the surface of the O-ring seal to contact the inner wall of the cylinder in stages.

[0009] The expansion assembly is radially slidably connected inside the piston. The end of the expansion assembly abuts against the inner wall of the retaining ring, which is used to drive the retaining ring to expand radially.

[0010] As a preferred embodiment of the present invention, the cylinder barrel is fixed with end caps at both ends, the two sets of end caps are fixedly connected by a pull rod, and a piston rod is slidably connected inside one set of end caps, with the end of the piston rod connected to the piston.

[0011] As a preferred embodiment of the present invention, the piston surface is provided with a sealing groove and a retaining ring groove, and the O-ring and the retaining ring are respectively located inside the sealing groove and the retaining ring groove.

[0012] As a preferred embodiment of the present invention, the pushing assembly includes: a through hole, which is opened inside the piston, and at least three gas channels are provided on one side of the through hole, the gas channels being connected to the annular main gas channel and the sealing groove; and a sealing pushing rod, which is slidably connected inside the through hole.

[0013] As a preferred embodiment of the present invention, the pushing assembly further includes an arc-shaped groove and a guide post. The arc-shaped groove is formed on the surface of the sealing pushing rod, the guide post is fixed inside the piston, and the end of the guide post is slidably connected inside the arc-shaped groove.

[0014] As a preferred embodiment of the present invention, the expansion assembly includes: a rotating cylinder rotatably connected inside the piston, and a sealing push rod surface connected inside the rotating cylinder via a spline shaft and a spline sleeve; a spiral groove formed on the surface of the rotating cylinder, with the spiral grooves distributed from deep to shallow from the center to both ends of the rotating cylinder; and a push rod slidably connected inside the piston, with one end of the push rod slidably connected in the spiral groove and the other end fixed with a top seat, the top seat engaging with the inner wall of the retaining ring.

[0015] As a preferred embodiment of the present invention, a rod sealing ring is installed inside the end cap, and the piston rod surface is slidably connected inside the rod sealing ring.

[0016] As a preferred embodiment of the present invention, throttle valves are installed on the two sets of end caps, and the throttle valves are connected to the inside of the cylinder.

[0017] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: In the present invention, when the pressure inside the cylinder increases, the sealing push rod will rotate in the through hole under the action of high pressure, which can prevent the sealing push rod from getting stuck when sliding. In addition, the air distribution channels on the side of the through hole are exposed one by one to allow air to enter. Therefore, when the pressure inside the cylinder increases, the inner side of the O-ring seal comes into contact with the high-pressure gas step by step, which enhances the sealing performance between the O-ring seal and the cylinder step by step.

[0018] When the pressure inside the cylinder increases, the rotating cylinder drives the spiral groove to rotate. The push rod, under the action of the spiral groove, pushes the top seat to move radially. The top seat pushes the retaining ring at its end to expand. Even under extremely high pressure and temperature for a long time, it can still ensure that the retaining ring and the cylinder are in close contact. This allows the retaining ring to provide stable support for the O-ring seal and prevent the O-ring seal from being squeezed into the gap. Compared with the existing technology, which only uses the retaining ring to provide support for the O-ring seal, this increases the sealing performance of the O-ring seal and extends its service life.

[0019] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 A schematic diagram of the overall structure of the cylinder barrel provided for an embodiment of the present invention.

[0021] Figure 2 A cross-sectional view of the piston of an actuator O-ring sealing assembly provided by the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the cylinder barrel of an actuator O-ring sealing assembly provided by the present invention.

[0023] Figure 4 for Figure 3 A magnified view of part A in the middle.

[0024] Reference numerals: 1. Cylinder barrel; 11. End cap; 12. Piston rod; 13. Connecting rod; 14. Rod seal; 15. Throttle valve; 16. Piston; 17. Buffer seal; 2. O-ring seal; 21. Sealing groove; 3. Retaining ring; 31. Retaining ring groove; 4. Push assembly; 41. Through hole; 42. Sealing push rod; 43. Air distribution passage; 44. Annular main air passage; 45. Arc groove; 46. Guide post; 5. Expansion assembly; 51. Rotating cylinder; 52. Spiral groove; 53. Push rod; 54. Top seat. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0027] See Figures 1-4 An actuator O-ring sealing assembly is provided. The actuator includes a cylinder 1, and a piston 16 is slidably connected inside the cylinder 1. An O-ring 2 and a retaining ring 3 are embedded in the surface of the piston 16. The actuator O-ring sealing assembly includes:

[0028] The push assembly 4 is axially slidably connected inside the piston 16, and its end is connected to the O-ring seal 2, which is used to push the surface of the O-ring seal 2 to contact the inner wall of the cylinder barrel 1 in stages.

[0029] The expansion assembly 5 is radially slidably connected inside the piston 16. The end of the expansion assembly 5 abuts against the inner wall of the retaining ring 3, which is used to drive the retaining ring 3 to expand radially.

[0030] In one embodiment of the present invention, such as Figure 1 As shown, end caps 11 are fixed to both ends of the cylinder barrel 1. The two sets of end caps 11 are fixedly connected by a tie rod 13. A piston rod 12 is slidably connected inside one set of end caps 11, and the end of the piston rod 12 is connected to the piston 16. The piston 16 has a sealing groove 21 and a retaining ring groove 31 on its surface. An O-ring seal 2 and a retaining ring 3 are located inside the sealing groove 21 and the retaining ring groove 31, respectively. A rod seal 14 is installed inside the end cap 11, and the piston rod 12 is slidably connected to the inside of the rod seal 14. Throttling valves 15 are installed on both sets of end caps 11, and the throttle valves 15 are in communication with the inside of the cylinder barrel 1.

[0031] In this embodiment, when compressed air enters the cylinder 1 through the throttle valve 15 at one end, it pushes the piston 16 to move to the other end, causing the piston rod 12 to extend or retract, thereby driving the external load. When the piston 16 needs to return to its original position, compressed air enters through the throttle valve 15 at the other end, while exhaust is released from the original end, causing the piston 16 to move in the opposite direction under the pressure difference. Buffer sealing rings 17 are fixed to both sides of the piston 16. The buffer sealing rings 17 prevent impact and noise when the piston 16 reaches the end of its stroke, protecting the cylinder.

[0032] In one embodiment of the present invention, such as Figure 4 As shown, the pushing component 4 includes:

[0033] A through hole 41 is provided inside the piston 16. At least three sets of air passages 43 are provided on one side of the through hole 41. The air passages 43 are connected to the annular main air passage 44 and the sealing groove 21.

[0034] The sealing push rod 42 is slidably connected inside the through hole 41.

[0035] In this embodiment, when compressed air enters the cylinder 1 from the throttle valve 15 at one end, it pushes the piston 16 to move to the other end. The two sets of O-ring seals 2 on the surface of the piston 16 can prevent compressed air leakage and maintain stable pressure inside the cylinder.

[0036] When the pressure inside the cylinder barrel 1 increases, under the action of high pressure, the sealing push rod 42 will move towards the low-pressure side inside the through hole 41, so that the ends of the air distribution channels 43 on the side of the through hole 41 are exposed one by one to allow air to enter. In this embodiment, there are three sets of air distribution channels 43. The high-pressure gas enters the annular main air channel 44 through the air distribution channels 43 in stages, and finally enters the interior of the sealing groove 21, thereby pushing the O-ring seal 2 in the sealing groove 21 to make close contact with the inner wall of the cylinder barrel 1. Therefore, as the pressure inside the cylinder barrel 1 gradually increases, the sealing performance of the O-ring seal 2 will not decrease, but will instead be enhanced because the inner side of the O-ring seal 2 comes into contact with the high-pressure gas, causing the contact pressure between the O-ring seal 2 and the cylinder barrel 1 to increase.

[0037] In one embodiment of the present invention, such as Figure 4 As shown, the pushing assembly 4 also includes an arc-shaped groove 45 and a guide post 46. The arc-shaped groove 45 is formed on the surface of the sealing pushing rod 42, and the guide post 46 is fixed inside the piston 16. The end of the guide post 46 is slidably connected inside the arc-shaped groove 45.

[0038] In this embodiment, when the sealing push rod 42 moves toward the low-pressure side in the through hole 41, under the action of the arc groove 45 and the guide post 46, the sealing push rod 42 will rotate in the through hole 41, which can prevent the sealing push rod 42 from getting stuck when sliding and expose the air distribution channel 43.

[0039] In one embodiment of the present invention, such as Figure 2 and Figure 4 As shown, the expansion component 5 includes:

[0040] The rotating cylinder 51 is rotatably connected inside the piston 16, and the surface of the sealing push rod 42 is connected inside the rotating cylinder 51 through a splined shaft and a splined sleeve.

[0041] Spiral grooves 52 are formed on the surface of the rotating cylinder 51, and the spiral grooves 52 from the center to both ends of the rotating cylinder 51 are distributed from deep to shallow.

[0042] The push rod 53 is slidably connected inside the piston 16. One end of the push rod 53 is slidably connected in the spiral groove 52, and the other end is fixed with a top seat 54, which is engaged with the inner wall of the retaining ring 3.

[0043] In this embodiment, when the pressure inside the cylinder 1 increases, the O-ring 2 undergoes elastic deformation, and some material from its low-pressure side begins to be squeezed into the gap formed between the piston 16 and the inner wall of the cylinder 1. When the piston 16 moves, the material squeezed into the gap is sheared off, causing the O-ring 2 to lose its sealing ability. A retaining ring 3 is installed between the two sets of O-rings 2. The retaining ring 3 fills the gap between the piston 16 and the cylinder 1, providing support for the O-ring 2 and preventing it from being squeezed into the gap.

[0044] When the pressure inside the cylinder 1 increases, the sealing push rod 42 rotates within the through hole 41. The sealing push rod 42 drives the rotating cylinder 51 to rotate synchronously, and the rotating cylinder 51 drives the spiral groove 52 to rotate. Since the end of the push rod 53 is slidably connected inside the spiral groove 52, and the spiral groove 52 is distributed from deep to shallow on the surface of the rotating cylinder 51, the push rod 53 will push the top seat 54 to move radially under the action of the spiral groove 52, causing the top seat 54 to push the retaining ring 3 at its end to expand. Even under extremely high pressure and temperature for a long time, it can still ensure that the retaining ring 3 and the cylinder 1 are in close contact, so that the retaining ring 3 can provide a stable support for the O-ring seal 2, preventing the O-ring seal 2 from being squeezed into the gap, increasing the sealing performance of the O-ring seal 2 and extending the service life of the O-ring seal 2.

[0045] The working principle of this invention is as follows: When compressed air enters the cylinder 1 from the throttle valve 15 at one end, it pushes the piston 16 to move to the other end. The two sets of O-ring seals 2 on the surface of the piston 16 can prevent compressed air leakage and maintain the pressure inside the cylinder. The retaining ring 3 can fill the gap between the piston 16 and the cylinder 1, provide support for the O-ring seal 2, and prevent it from being squeezed into the gap.

[0046] When the pressure inside the cylinder barrel 1 increases, the sealing push rod 42 moves towards the low-pressure side within the through hole 41 under high pressure, causing the ends of the air distribution passages 43 on the side of the through hole 41 to be exposed one by one for air intake. The high-pressure gas enters the annular main air passage 44 through the air distribution passages 43 and finally enters the sealing groove 21, thereby pushing the O-ring seal 2 in the sealing groove 21 to make tight contact with the inner wall of the cylinder barrel 1. As the pressure inside the cylinder barrel 1 gradually increases, the sealing performance of the O-ring seal 2 will not decrease, but will instead be enhanced because the inner side of the O-ring seal 2 comes into contact with the high-pressure gas, causing the contact pressure between the O-ring seal 2 and the cylinder barrel 1 to increase.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An actuator O-ring sealing assembly, the actuator including a cylinder (1), wherein a piston (16) is slidably connected inside the cylinder (1), characterized in that, The piston (16) has an O-ring (2) and a retaining ring (3) embedded in its surface. The actuator O-ring sealing assembly includes: The push assembly (4) is axially slidably connected inside the piston (16), and its end is connected to the O-ring seal (2) for gradually pushing the surface of the O-ring seal (2) to contact the inner wall of the cylinder barrel (1); The expansion assembly (5) is radially slidably connected inside the piston (16). The end of the expansion assembly (5) abuts against the inner wall of the retaining ring (3) to drive the retaining ring (3) to expand radially. The piston (16) has a sealing groove (21) and a retaining ring groove (31) on its surface. The O-ring seal (2) and the retaining ring (3) are located inside the sealing groove (21) and the retaining ring groove (31), respectively. The actuating component (4) includes: A through hole (41) is provided inside the piston (16). At least three sets of air passages (43) are provided on one side of the through hole (41). The air passages (43) are connected through the annular main air passage (44) and the sealing groove (21). The sealing push rod (42) is movably connected inside the through hole (41); The push assembly (4) further includes an arc groove (45) and a guide post (46). The arc groove (45) is formed on the surface of the sealing push rod (42), and the guide post (46) is fixed inside the piston (16). The end of the guide post (46) is slidably connected inside the arc groove (45).

2. The actuator O-ring sealing assembly according to claim 1, characterized in that, The cylinder barrel (1) is fixed with end caps (11) at both ends. The two sets of end caps (11) are fixedly connected by a pull rod (13). A piston rod (12) is slidably connected inside one set of end caps (11). The end of the piston rod (12) is connected to the piston (16).

3. The actuator O-ring sealing assembly according to claim 1, characterized in that, The expansion component (5) includes: The rotating cylinder (51) is rotatably connected inside the piston (16), and the surface of the sealing push rod (42) is connected inside the rotating cylinder (51) through a spline shaft and a spline sleeve; Spiral grooves (52) are formed on the surface of the rotating cylinder (51), and the spiral grooves (52) from the center to both ends of the rotating cylinder (51) are distributed from deep to shallow. The push rod (53) is slidably connected inside the piston (16). One end of the push rod (53) is slidably connected in the spiral groove (52), and the other end is fixed with a top seat (54). The top seat (54) is engaged with the inner wall of the retaining ring (3).

4. The actuator O-ring sealing assembly according to claim 2, characterized in that, The end cap (11) is equipped with a rod seal ring (14), and the piston rod (12) is slidably connected to the inside of the rod seal ring (14).

5. The actuator O-ring sealing assembly according to claim 4, characterized in that, Throttling valves (15) are installed on both sets of end caps (11), and the throttle valves (15) are internally connected to the cylinder barrel (1).

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