KR101694641B1 - Sealing assembly and hydraulic actuator cylinder assembly of turbine valve having the same - Google Patents

Abstract

The present invention relates to a sealing assembly and a hydraulic actuator cylinder assembly for a turbine valve, including the same. The sealing assembly seals a gap between a first body, having a circular cross section, and a second body having a circular cross section assembled with the outer or inner surface of the first body. The sealing assembly includes: an O-ring member inserted into a sealing groove of the first body; and a sealing member inserted into the sealing groove, and installed between the O-ring member and the second body. As such, the sealing assembly keeps airtightness between the first and second bodies. The sealing member includes: a first sealing unit installed on a side, taking hydraulic fluid, to primarily prevent a leak of the hydraulic fluid, and including a first protruding part protruding towards the second body to make line contact with the inner surface of the second body; and a second sealing unit integrated with the first sealing unit, but installed on the opposite side to the side, taking the hydraulic fluid, to secondarily prevent a leak of the hydraulic fluid, and including a second protruding part making line contact with the inner surface of the second body. The sealing member is able to more include: an oil pocket formed between the first and second protruding parts, and filled with the hydraulic fluid to improve lubrication between the first and second sealing units; and an oil hole penetrated between the first and second sealing units to induce the hydraulic fluid, flowing in through an inlet formed in an inflow direction of the hydraulic fluid, into the oil pocket.

Description

Technical Field [0001] The present invention relates to a sealing assembly and a turbine valve having the same and a hydraulic actuator cylinder assembly having the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing assembly and a turbine valve hydraulic actuator cylinder assembly having the same, and more particularly, to a sealing assembly and a turbine valve hydraulic actuator cylinder assembly having the piston and the rod are sealed safely without damaging the sealing member.

Generally, the sealing method of the piston head and the piston rod, which is applied to the turbine valve hydraulic actuator cylinder assembly, is resistant to radial load and has a structure that reduces frictional force when the piston moves. Also suitable is a single acting hydraulic actuator which is opened by hydraulic pressure and closed by spring force.

1 and 2 show a conventional seal 10. Fig. 1 is a cross-sectional view showing a conventional face contact type sealing material, and Fig. 2 is a sectional view showing a conventional line contact type sealing material.

1 and 2, the sealing member 10 used in the conventional hydraulic actuator includes sealing means 11 and 13 which are provided outside the O-ring 15 and the O-ring to contact the inner circumferential surface of the cylinder body 20 or the piston rod, .

Referring to Fig. 1, the sealing means 11 of the conventional surface contact type is sealed by sealing the sealing means 11 on the inner circumferential surface of the cylinder body or the like. However, according to this method, there is a problem that friction occurs before the lubricant film is formed and damage to the sealing means 11 and the cylinder body 20 occurs frequently in the case of frequent minute operation less than the width of the sealing material 10. [

Referring to Fig. 2, in the sealing means 13 of the conventional line contact type, the sealing means 13 is in surface contact with the inner circumferential surface of the cylinder body 20 or the like and sealed. However, this method has an unstable structure in which lubricating ability is excellent but damage to the sealing means 13 is liable to occur due to foreign matter or damage to the inner surface of the cylinder body 20, thereby increasing leakage amount.

Disclosure of Invention Technical Problem [8] The present invention has been proposed in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a sealing assembly for preventing leakage of fluid stably, To provide a cylinder assembly.

According to an aspect of the present invention, there is provided a sealing assembly for sealing between a first body having a circular cross section and a second body having a circular cross section assembled to the inner or outer peripheral surface of the first body, And a seal member inserted into the sealing groove and inserted between the O-ring member and the second body, wherein the first body and the second body, And the sealing member is provided on a side to which the operating oil is introduced to primarily prevent the leakage of the operating oil, and the first sealing member is provided on the side to which the operating oil flows, A first sealing means including a protruding portion; and a second sealing means formed integrally with the first sealing means, the second sealing means being provided on the first sealing means so as to prevent leakage of the operating oil, And a second sealing means provided on the opposite side of the inlet side and having a second protrusion protruding in line with the inner circumferential surface of the second body, wherein the sealing member is formed between the first protrusion and the second protrusion An oil pocket filled with operating oil to improve the lubricity of the first sealing means and the second sealing means; and an oil passage formed between the first sealing means and the second sealing means, And an oil hole for introducing the hydraulic fluid introduced through the inlet into the oil pocket.

Preferably, the oil holes may be formed such that a plurality of oil holes are spaced apart from each other by a predetermined distance so as to uniformly introduce hydraulic oil into the oil pockets.

Preferably, the first sealing means and the second sealing means comprise: a first inclined portion formed on one side of the first protrusion and the second protrusion, the first inclined portion being formed in a direction of flow of the hydraulic fluid; And a second inclined portion formed on the other side and having an inclination angle that is less than the inclination angle of the first inclined portion.

Preferably, the O-ring member may be formed of a plurality of two or more so as to evenly press the first sealing means and the second sealing means.

According to another aspect of the present invention, there is provided a turbine valve hydraulic actuator cylinder assembly including a cylindrical cylinder body, a rod-end cap and a lower-end cap coupled to both ends of the cylinder body, And a piston rod having an outer diameter smaller than the outer diameter of the piston head and fixed to the piston head; and a cylinder piston fitted to the outer circumferential surface of the piston rod, And a piston seal inserted into a sealing groove provided on an outer circumferential surface of the piston head to hold the sealing assembly between the outer circumferential surface of the piston head and the inner circumferential surface of the cylinder body. And a second sealing portion for sealing the first sealing portion.

A rod seal inserted in a sealing groove provided on an inner circumferential surface of the rod bush and retaining airtightness between the rod bush and the piston rod; and a rod seal inserted in a sealing groove provided at an outer end of the inner surface of the rod bush, And a dust seal for preventing foreign matter from flowing into the first sealing part.

Preferably, the first sealing portion further includes a first wearer installed on an outer circumferential surface of the piston head and guiding the movement of the cylinder piston when a pressure inside the cylinder body changes while being in contact with an inner circumferential surface of the cylinder body The second sealing portion may further include a second wearer installed on an inner circumferential surface of the rod bushing and guiding the movement of the cylinder piston in contact with the outer circumferential surface of the piston rod.

By using the sealing assembly and the turbine valve hydraulic actuator cylinder assembly having the same according to an embodiment of the present invention, since the sealing material has a double line contact structure, it is possible to maintain the excellent lubricity and to prevent damage to the sealing material , It is possible to stably provide an excellent effect of preventing fluid leakage.

According to an embodiment of the present invention, a lubricating layer filled with an operating oil is formed between the first sealing means and the second sealing means to smooth the lubrication of the contact surface between the first sealing means and the second sealing means , Providing an effect of improving the stability against damage due to the double structure.

1 is a cross-sectional view showing a sealing member of a conventional surface contact type.
2 is a cross-sectional view showing a seal member of a conventional line contact type.
3 is a cross-sectional view illustrating a turbine valve hydraulic actuator cylinder assembly according to an embodiment of the present invention.
4 is an enlarged cross-sectional view showing a portion " A " in Fig.
5 is an enlarged cross-sectional view showing a portion " B " in Fig.
6 is an enlarged cross-sectional view of a sealing assembly applied to an embodiment of the present invention.
7 is a top view showing a top surface of a sealing assembly according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the embodiments described below are embodiments suitable for understanding the technical features of a sealing assembly and a turbine valve hydraulic actuator cylinder assembly having the same. However, the technical features of the present invention are not limited by the embodiments to which the present invention is applied or explained in the following embodiments, and various modifications are possible within the technical scope of the present invention.

3 to 5, a turbine valve hydraulic actuator cylinder assembly 100 according to an embodiment of the present invention includes a cylinder piston 200, a rod bush 300, (400), and a second sealing part (500).

3, a turbine valve hydraulic actuator cylinder assembly 100 according to an embodiment of the present invention includes a cylindrical cylinder body 20, and a cylinder head assembly 20 coupled to both ends of the cylinder body 20. As shown in FIG. And may include a rod-end cap 40 and a lower-end cap 50.

The cylinder piston 200 may include a piston head 210 and a piston rod 230.

The piston head 210 is inserted into the cylinder body 20 and is disposed adjacent to the lower end cap 50, and may be formed in a cylindrical shape. The piston rod 230 may have an outer diameter smaller than the outer diameter of the piston head 210 and may be fixed to the piston head 210.

The cylinder piston 200 constructed as described above can move up and down by the pressure of the fluid flowing into and out of the cylinder body 20.

On the other hand, the rod bush 300 is fitted to the outer circumferential surface of the piston rod 230 and can be fixed to the rod-end cap 40 through the flange-shaped cylinder cap 45.

The rod bushing 300 can cope with a radial load applied to the piston rod 230 while minimizing wear of the piston rod 230 during movement of the cylinder piston 200.

The turbine valve hydraulic actuator cylinder assembly 100 according to an embodiment of the present invention includes a first sealing part 400 for sealing between the piston head 210 and the cylinder body 20, And a second sealing part 500 sealing between the rod bush 300 and the second sealing part 500.

3 and 4, the first sealing part 400 is installed on the outer circumferential surface of the piston head 210 and is positioned between the outer circumferential surface of the piston head 210 and the inner surface of the cylinder body 20, Can be kept secret.

The first sealing part 400 may include a piston seal 410 and a first wear ring 470.

The piston seal 410 includes a first O-ring 430 inserted into the seal groove 211 of the piston head 210 and a first seal member 420 disposed between the first O-ring 430 and the cylinder body 20 ). The first seal member 420 seals between the outer circumferential surface of the piston head 210 and the inner circumferential surface of the cylinder body 20 together with the first O-ring 430 and contacts the inner circumferential surface of the cylinder body 20, For example, PTFE (polytetrafluoroethylene), etc.).

As such, the piston seal 410 may be a sealing assembly including the first O-ring 430 and the first sealant 420.

The first wear ring 470 is provided on the outer circumferential surface of the piston head 210 and is capable of guiding the movement of the cylinder piston 200 when the pressure inside the cylinder body 20 changes while contacting the inner circumferential surface of the cylinder body 20 have.

3 and 5, the second sealing portion 500 may include a load seal 510, a dust seal 540, and a second wear ring 570. [

The rod seal 510 includes a second O-ring 530 inserted into the seal groove 301 of the rod bush 300 and a second seal member 520 disposed between the second O-ring 530 and the piston rod 230 ). The second seal member 520 seals the rod bush 300 and the piston rod 230 together with the second O-ring 530 and can contact the outer circumferential surface of the piston rod 230. Like the first sealing material 420 of the second sealing material 520, the first sealing material 420 may be composed of a composite containing a fluororesin (e.g., PTFE).

5, the dust seal 540 is installed at the outer end of the inner circumferential surface of the rod bush 300 to prevent foreign matter from flowing into the cylinder body 20. As shown in FIG.

More specifically, the dust seal 540 includes a third O-ring 560 inserted into the seal groove 301 of the rod bush 300 and a third O-ring 560 inserted between the third O-ring 560 and the piston rod 230. [ And may include a sealing material 550. The third seal member 550 seals between the rod bush 300 and the piston rod 230 together with the third O-ring 560 to prevent foreign matter from entering the rod bush 300 side, Can be prevented. The third sealing material 550 may be composed of a composite material containing a fluororesin (for example, PTFE or the like) like the first sealing material 420 and the second sealing material 520.

The second wear ring 570 is installed on the inner peripheral surface of the rod bush 300 and can guide the movement of the cylinder piston 200 while being in contact with the outer circumferential surface of the piston rod 230.

As shown, the rod seals 510 and the dust seals 540 apply a reference compound chamber, but the piston seals 410 may be made of a sealing assembly according to one embodiment of the present invention.

Hereinafter, referring to the embodiments shown in FIGS. 6 and 7, a description will be given of a sealing assembly that is a structure that constitutes the first sealing portion 400. FIG. Hereinafter, the first sealing member 420 and the first O-ring 430, which are sealing assemblies constituting the piston seal 410 of the first sealing portion 400, will be described by way of example.

Therefore, the reference numerals of the respective components of the sealing assembly described below will be described with reference to the reference numerals of the first sealing portion 400. That is, the first body of the sealing assembly described below is denoted by the reference numeral of the piston head 210, the second body is denoted by the reference numeral of the cylinder body 20, Reference numerals of the first O-ring 430 and reference numerals of the first sealing member 420 will be described as the sealing members.

6, the sealing member 420 may have a first protrusion 421a and a second protrusion 425a which are in line contact with the inner circumferential surface of the second body 20. The first and second protrusions 421a and 425a are sealed between the second body 20 and the first body 210 by the contact between the inner surface of the second body 20 and the inner surface of the second body 20, Can be prevented from leaking to the outside.

The first protrusion 421a and the second protrusion 425a are in line contact with the inner circumferential surface of the second body 20 so that the cylinder piston 200 performs frequent fine operations less than the width of the sealing member 420 The lubricating film can be easily formed and excellent lubricity can be obtained.

6, the sealing member 420 includes a first sealing means 421 for primarily preventing leakage of the fluid and a second sealing means 425 for preventing secondary leakage. Structure.

Specifically, the first sealing means 421 is disposed inside the second body 20 filled with the working oil, and the first protrusion 421a may be formed. The second sealing means 425 includes the second protrusion 425a and the second protrusion 425a may be disposed at the outer end of the first protrusion 421a.

Accordingly, the operating fluid between the first and second bodies 210 and 20 is prevented from leaking to the outside primarily by the first protrusion 421a, the first protrusion 421a is damaged, The second projection 425a can be prevented from being leaked secondarily.

6 and 7, the sealing member 420 may further include an oil pocket 428 and an oil hole 429.

The oil pocket 428 is formed between the first projecting portion 421a and the second projecting portion 425a and is filled with operating oil to improve the lubricity of the first sealing means 421 and the second sealing means 425 have.

The oil hole 429 is formed to pass through between the first sealing means 421 and the second sealing means 425 so that the operating oil introduced through the inlet formed in the operating oil inflow direction is introduced into the oil pocket 428 .

6, the sealing member 420 is pushed in a direction opposite to the direction in which the operating oil is introduced by the pressure P of the working oil, so that the operating oil flows into the oil hole 429 and flows into the oil pocket 428, Can be filled with hydraulic oil.

The lubricating layer is formed not only in the first sealing means 421 but also in the second sealing means 425 by filling the oil pocket 428 with the operating oil during the operation of the system, The damage can be prevented.

Therefore, the sealing assembly according to the present invention can stably prevent damage due to the double structure of the first and second sealing means while maintaining the lubricity by the linear contact structure. Therefore, it is possible to stably prevent leakage of the fluid Can be provided.

At this time, the oil hole 429 can be applied without any limitation in shape, as long as the hydraulic oil can flow into the oil pocket 428 between the first sealing means 421 and the second sealing means 425. 6, the operating oil introduced into the oil hole 429 formed in the direction of the pressure P of the operating oil is called a first projection (not shown) 421a and the second projection 425a.

7, the oil holes 429 may be formed such that a plurality of oil holes 429 are spaced apart from each other by a predetermined distance in the circumferential direction so that the fluid is uniformly introduced into the oil pockets 428.

In the illustrated embodiment, four oil holes 429 are formed, but the present invention is not limited thereto. The oil holes 429 may be formed in various numbers depending on the size of the sealing member 420 and the hydraulic pressure of the hydraulic actuator. Further, the plurality of oil holes 429 may be arranged at regular intervals to uniformly fill the entire oil pocket 428 with the operating oil.

On the other hand, the first sealing means 421 and the second sealing means 425 are provided with first inclined portions 422 and 426 formed at one side of the first projecting portion 421a and the second projecting portion 425a and formed in the flow- And second inclined portions 423 and 427 formed on the other side of the first protruding portion 421a and the second protruding portion 425a and having a slope angle that is less than the inclination angle of the first inclined portions 422 and 426. [

The first sealing means 421 includes a first inclined portion 422 formed on the inner side of the second body 20 with respect to the first projected portion 421a and a second inclined portion 422 formed on the outer side of the second inclined portion 422 formed on the outer side of the second body 20, The first inclined portion 422 may be formed with a sharp inclination relative to the second inclined portion 423.

Accordingly, the first inclined portion 422 is formed in the direction in which the operating oil flows, and the inclined portion is formed urgently, so that the first inclined portion 422 can effectively maximize the effect of preventing leakage of the operating oil by effectively responding to the pressure by the operating oil.

On the other hand, each of the O-ring members 430 may be composed of a plurality of O-rings.

6, each of the O-ring members 430 presses the first sealing means 421 and the second sealing means 425, respectively, so that the O- The pressing force can be evenly applied to the first sealing means 421 and the second sealing means 425. [ However, the present invention is not limited thereto. If the first sealing means 421 and the second sealing means 425 can be evenly pressed, three or more As shown in FIG.

Accordingly, the sealing force of the sealing member 420 having a double structure can be further maximized.

By using the sealing assembly and the turbine valve hydraulic actuator cylinder assembly having the same according to an embodiment of the present invention, since the sealing material has a double line contact structure, it is possible to maintain the excellent lubricity and to prevent damage to the sealing material , It is possible to stably provide an excellent effect of preventing fluid leakage.

According to an embodiment of the present invention, a lubricating layer filled with an operating oil is formed between the first sealing means and the second sealing means to smooth the lubrication of the contact surface between the first sealing means and the second sealing means , Providing an effect of improving the stability against damage due to the double structure.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention, It will be appreciated that those skilled in the art will readily understand the present invention.

100: Turbine Valve Hydraulic Actuator Cylinder Assembly
200: cylinder piston 210: piston head
230: Piston rod 300: Rod bush
400: first sealing portion 410: piston seal
420: first sealing material 421: first sealing means
425: second sealing means 428: oil pocket
429: oil hole 430: first o-ring
470: first wearer 500: second sealing part
510: rod seal 520: second sealant
530: second o-ring 540: dust seal
550: third sealing material 560: third o-ring
570: Secondary wear ring

Claims (7)

A sealing assembly for sealing between a first body having a circular cross section and a second body having a circular cross section assembled to an inner circumferential surface or an outer circumferential surface of the first body,
An o-ring member inserted into a sealing groove formed in the first body; And
And a sealing member inserted in the sealing groove and provided between the O-ring member and the second body to maintain airtightness between the first body and the second body,
Wherein the sealing member includes a first sealing portion provided on a side to which the operating oil flows to prevent leakage of the operating oil in a primary direction and includes a first protrusion protruded toward the second body side so as to be in line contact with the inner circumferential surface of the second body, And a second sealing means provided on the opposite side of a side where the operating oil flows on the basis of the first sealing means so as to prevent leakage of the operating oil in a secondary manner, And a second sealing means having a second projection protruding from the second sealing member,
Wherein the sealing member includes an oil pocket formed between the first projection and the second projection and filled with operating oil to improve the lubricity of the first sealing means and the second sealing means; And an oil hole penetratingly formed between the second sealing means and allowing the hydraulic fluid introduced through the inlet formed in the operating oil flow direction to flow into the oil pocket. The method according to claim 1,
Wherein the oil holes are formed such that a plurality of oil holes are spaced apart from each other by a predetermined distance so as to uniformly introduce hydraulic oil into the oil pockets. The method according to claim 1,
The first sealing means and the second sealing means may include a first inclined portion formed on one side of the first projecting portion and the second projecting portion and formed in the inflow direction of the operating oil and a second inclined portion formed on the other side of the first projecting portion and the second projecting portion And a second inclined portion having a slope angle that is less than the inclination angle of the first inclined portion. The method according to claim 1,
Wherein the O-ring member is made of a plurality of two or more so as to evenly press the first sealing means and the second sealing means. A turbine valve hydraulic actuator cylinder assembly including a cylindrical cylinder body, a rod-end cap and a lower-end cap coupled to both ends of the cylinder body,
A cylinder piston having a cylindrical piston head inserted into the cylinder body and a piston rod having an outer diameter smaller than the outer diameter of the piston head and fixed to the piston head;
A rod bush fitted on an outer circumferential surface of the piston rod and fixed to the rod-end cap through a flange-shaped cylinder cap; And
The piston seal according to any one of claims 1 to 4, inserted into a sealing groove provided on the outer circumferential surface of the piston head to maintain airtightness between the outer circumferential surface of the piston head and the inner circumferential surface of the cylinder body A first sealing portion;
A turbine valve hydraulic actuator cylinder assembly. 6. The method of claim 5,
A rod seal inserted in a sealing groove provided on an inner circumferential surface of the rod bush and retaining airtightness between the rod bush and the piston rod; a rod seal inserted in a sealing groove provided at an outer end of the rod bushing inner circumferential surface, And a second seal portion having a dust seal for preventing the fluid from entering the turbine casing. The method according to claim 6,
Wherein the first sealing portion further comprises a first wearer installed on an outer circumferential surface of the piston head and guiding the movement of the cylinder piston when a pressure inside the cylinder body changes while being in contact with an inner circumferential surface of the cylinder body,
Wherein the second sealing portion further comprises a second wearer installed on an inner circumferential surface of the rod bushing and guiding the movement of the cylinder piston while being in contact with the outer circumferential surface of the piston rod.

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