Shaft end sealing structure of hydraulic actuating mechanism of high-pressure bypass valve

Abstract

The utility model relates to the technical field of high-pressure bypass valves, in particular to a shaft end sealing structure of a hydraulic actuating mechanism of a high-pressure bypass valve, which comprises an end cover, a piston rod connected with the end cover in a sliding manner, a combined dustproof ring used for connecting the end cover and the piston rod, a combined check ring, a step seal I, a step seal II and a guide belt, the combined dustproof ring, the combined check ring, the step seal I, the step seal II and the guide belt are sequentially arranged from outside to inside of the oil cylinder; in practical application, the combined dustproof ring, the combined check ring, the step seal I, the step seal II and the guide belt are sequentially arranged from outside to inside of the oil cylinder, so that the sealing performance of the end cover is effectively ensured, and the service life of the end cover is prolonged; according to the utility model, oil leakage of the end cover can be avoided, the service life of the end cover is prolonged, and fire disasters caused by contact of leaked hydraulic oil with the high-temperature valve body and the thermal insulation cotton can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure bypass valve technical field, concretely is a kind of high pressure bypass valve hydraulic actuator shaft end sealing structure. BACKGROUND

[0002] The existing high pressure bypass valve hydraulic actuator shaft lower end cover sealing includes front end cover and piston rod, and the sealing element between front end cover and piston rod is sealed by guide ring, sealing ring, dustproof ring one and dustproof ring two, and the material of sealing ring, dustproof ring one and dustproof ring two is polyurethane.Because the sealing of the front end cover of actuator is short distance from high temperature valve body, the sealing of hydraulic actuator is influenced by valve body heat radiation for a long time, not only the performance of sealing element is influenced, but also the front end cover is prone to oil leakage, the service life of front end cover is shortened, and the leaked hydraulic oil contacts high temperature valve body and heat preservation cotton, and fire is prone to occur. SUMMARY

[0003] The utility model discloses a kind of high pressure bypass valve hydraulic actuator shaft end sealing structures, not only can avoid the situation that end cover appears oil leakage, prolong the service life of end cover, but also can avoid the situation that the leaked hydraulic oil contacts high temperature valve body and heat preservation cotton and fire occurs.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A kind of high pressure bypass valve hydraulic actuator shaft end sealing structure, including end cover, the piston rod of sliding connection end cover, the combined dustproof ring, combined stop ring, ster seal one, ster seal two and guide belt for connecting the end cover and piston rod are used, the combined dustproof ring, combined stop ring, ster seal one, ster seal two and guide belt are sequentially arranged from outside to oil cylinder interior.

[0006] Further, the combined dustproof ring includes PTFE sealing ring and fluorine rubber O ring one, the outer side of the PTFE sealing ring is recessed to the inside, the fluorine rubber O ring one is arranged in recessed place, the inner side of the PTFE sealing ring is provided with V-shaped protrusion, the inner side of the PTFE sealing ring and the convex point of V-shaped protrusion are all abutted with the outer side of piston rod.

[0007] Further, the combined stop ring includes Y-shaped sealing ring and fluorine rubber sealing ring, oil film is arranged between the lip of Y-shaped sealing ring and piston rod sliding surface, one side of the Y-shaped sealing ring is provided with opening, the opening is arranged towards oil cylinder interior, the fluorine rubber sealing ring is arranged on the other side of Y-shaped sealing ring.

[0008] Further, the Y-shaped sealing ring is made of fluorine rubber.

[0009] Further, the Stoffon I and Stoffon II each include a PTFE ring and a fluororubber O-ring II, the inner side of the PTFE ring is provided with an inward protrusion, the protruding point of the inward protrusion abuts against the piston rod, and the fluororubber O-ring II is sleeved on the outer side of the PTFE ring.

[0010] Further, the width of the guide belt is not less than one fifth of the axial length of the end cover.

[0011] The utility model discloses the beneficial effect is:

[0012] In practical application, through the combined dust ring, the combined check ring, the Stoffon I, the Stoffon II and the guide belt arranged from outside to the inside of the oil cylinder in sequence, the sealing property of the end cover is effectively guaranteed, and the service life of the end cover is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the whole structure schematic diagram of the utility model discloses;

[0014] Figure 2 It is the sectional view of the combined dust ring in the utility model discloses;

[0015] Figure 3 It is the sectional view of the combined check ring in the utility model discloses;

[0016] Figure 4 It is the sectional view of the Stoffon I or Stoffon II in the utility model discloses;

[0017] Reference signs: end cover 1;Piston rod 2;Combined dust ring 3;PTFE sealing ring 31;Recess 311;V-shaped protrusion 312;Fluororubber O-ring I 32;Combined check ring 4;Y-shaped sealing ring 41;Lip 411;Opening 412;Fluororubber sealing ring 42;Stoffon I 5;PTFE ring 51;Inward protrusion 511;Fluororubber O-ring II 52;Stoffon II 6;Guide belt 7. DETAILED DESCRIPTION

[0018] As Figure 1 , Figure 2 , Figure 3 and Figure 4 Indicated, a kind of high-pressure bypass valve hydraulic actuator axle end sealing structure, including end cover 1, the piston rod 2 of sliding connection end cover 1, for connecting the combined dust ring 3, the combined check ring 4, the Stoffon I 5, the Stoffon II 6 and guide belt 7 of the end cover 1 and piston rod 2, the combined dust ring 3, the combined check ring 4, the Stoffon I 5, the Stoffon II 6 and guide belt 7 are arranged from outside to the inside of oil cylinder in sequence.

[0019] The combination dustproof ring 3, the combination blocking ring 4, the stellite seal 1 5, the stellite seal 2 6 and the guide belt 7 are sequentially arranged from the outside to the inside of the oil cylinder, so that the sealing property of the end cover 1 is effectively ensured, and the service life of the end cover 1 is prolonged; the utility model not only can avoid the oil leakage of the end cover 1, prolong the service life of the end cover 1, but also can avoid the situation that the leaked hydraulic oil contacts the high-temperature valve body and the heat preservation cotton to cause fire.

[0020] As Figure 1 , Figure 2 , Figure 3 and Figure 4 indicated, the combination dustproof ring 3 includes a PTFE sealing ring 31 and a fluororubber O-ring 1 32, the outer side of the PTFE sealing ring 31 is recessed to form a recess 311, the fluororubber O-ring 1 32 is arranged at the recess 311, the inner side of the PTFE sealing ring 31 is provided with a V-shaped protrusion 312, and the inner side of the PTFE sealing ring 31 and the convex points of the V-shaped protrusion 312 are all in abutment with the outer side of the piston rod 2; in the embodiment, the sealing force is provided by the fluororubber O-ring 1 32, the PTFE sealing ring 31 plays a sealing role on hydraulic oil, steam, water and emulsion, and the V-shaped protrusion 312 can reduce the frictional resistance between the PTFE sealing ring 31 and the piston rod 2, wherein the PTFE is polytetrafluoroethylene.

[0021] As Figure 1 , Figure 2 , Figure 3 and Figure 4 indicated, the combination blocking ring 4 includes a Y-shaped sealing ring 41 and a fluororubber sealing ring 42, an oil film is arranged between the lip 411 of the Y-shaped sealing ring 41 and the sliding surface of the piston rod 2, one side of the Y-shaped sealing ring 41 is provided with an opening 412, the opening 412 is arranged towards the inside of the oil cylinder, and the fluororubber sealing ring 42 is arranged at the other side of the Y-shaped sealing ring 41; in the embodiment, the sealing effect of the Y-shaped sealing ring 41 is improved by the fluororubber sealing ring 42, the friction condition of the lip 411 of the Y-shaped sealing ring 41 is improved by the oil film, and the abrasion is reduced.

[0022] As Figure 1 , Figure 2 , Figure 3 and Figure 4 indicated, the Y-shaped sealing ring 41 is made of fluororubber; in the embodiment, the Y-shaped sealing ring 41 made of fluororubber can be used at-40℃-+200℃, and the service life of the end cover 1 is prolonged.

[0023] As Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the Stoffel 5 and the Stoffel 2 6 both include a polytetrafluoroethylene ring 51 and a fluororubber O-ring 52, an inner side of the polytetrafluoroethylene ring 51 is provided with an inward protrusion 511, a convex point of the inward protrusion 511 abuts against the piston rod 2, and the fluororubber O-ring 52 is sleeved on an outer side of the polytetrafluoroethylene ring 51; in the embodiment, the fluororubber O-ring 52 is a force element, provides sufficient sealing force, compensates the polytetrafluoroethylene ring 51, and makes the inward protrusion 511 always abut against the piston rod 2, has the advantages of low friction, no crawling, small starting force, high pressure resistance, simple groove structure and the like; the two groups of Stoffels are connected in series, and the sealing effect of the end cover 1 is improved.

[0024] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 Figure 1 Figure 2 Figure 3 Figure 4 , the width of the guide belt 7 is not less than one fifth of the axial length of the end cover 1; in the embodiment, since the guide belt 7 is made of polytetrafluoroethylene, the temperature range is wider, and the service life is longer; when the width of the guide belt 7 is not less than one fifth of the axial length of the end cover 1, the guide belt 7 can better guarantee the sealing effect of the equipment and improve the stability of the equipment.

[0025] The specific embodiments described herein are merely illustrative of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the scope defined by the present application.

Claims

1. A shaft end sealing structure for a high-pressure bypass valve hydraulic actuator, characterized in that: Includes an end cap, a piston rod that slides to connect the end cap, and a combination dustproof ring, a combination retaining ring, a first step seal, a second step seal, and a guide belt used to connect the end cap and the piston rod. The combination dustproof ring, the combination retaining ring, the first step seal, the second step seal, and the guide belt are arranged sequentially from the outside to the inside of the cylinder.

2. The shaft end sealing structure of a high-pressure bypass valve hydraulic actuator according to claim 1, characterized in that, The combined dustproof ring includes a PTFE sealing ring and a fluororubber O-ring. The outer side of the PTFE sealing ring forms an inward recess, and the fluororubber O-ring is disposed in the recess. The inner side of the PTFE sealing ring has a V-shaped protrusion, and both the inner side of the PTFE sealing ring and the protrusion of the V-shaped protrusion abut against the outer side of the piston rod.

3. The shaft end sealing structure of a high-pressure bypass valve hydraulic actuator according to claim 1, characterized in that, The combined retaining ring includes a Y-shaped sealing ring and a fluororubber sealing ring. An oil film is provided between the lip of the Y-shaped sealing ring and the sliding surface of the piston rod. An opening is provided on one side of the Y-shaped sealing ring, and the opening faces the inside of the oil cylinder. The fluororubber sealing ring is provided on the other side of the Y-shaped sealing ring.

4. The shaft end sealing structure of a high-pressure bypass valve hydraulic actuator according to claim 3, characterized in that, The Y-shaped sealing ring is made of fluororubber.

5. The shaft end sealing structure of a high-pressure bypass valve hydraulic actuator according to claim 1, characterized in that, Both Step Seal 1 and Step Seal 2 include a polytetrafluoroethylene (PTFE) ring and a fluororubber O-ring 2. The inner surface of the PTFE ring has an inward protrusion, and the protrusion of the inward protrusion abuts against the piston rod. The fluororubber O-ring 2 is sleeved on the outer surface of the PTFE ring.

6. The shaft end sealing structure of a high-pressure bypass valve hydraulic actuator according to claim 1, characterized in that, The width of the guide strip is not less than one-fifth of the axial length of the end cap.

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