KR20140067817A

KR20140067817A - Gas seal assembly

Info

Publication number: KR20140067817A
Application number: KR1020120135554A
Authority: KR
Inventors: 김진형; 신봉근
Original assignee: 삼성테크윈 주식회사
Priority date: 2012-11-27
Filing date: 2012-11-27
Publication date: 2014-06-05

Abstract

Disclosed is a gas seal assembly. the gas seal assembly includes a rotary sealing sleeve which is installed by being inserted into an inner sleeve; a sealing sleeve coming into contact with the rotary sealing sleeve; a press sleeve pressing the sealing sleeve to the rotary sealing sleeve by coming into contact with the sealing sleeve; a seal housing which is separated from the press sleeve and the sealing sleeve and on which one side of the press sleeve is arranged on the lower side of the bottom surface; two or more third sealing units installed between the press sleeve and the bottom surface of the seal housing; and an elastic unit providing the press sleeve of a restoration force by being installed between the seal housing and the press sleeve.

Description

Gas seal assembly

The present invention relates to an assembly, and more particularly, to a gas seal assembly.

In general, gas-tight assemblies can be used to seal gas to internal components in a device that uses gas. In particular, the gas seal assembly can be used in a device that compresses and uses a gas such as a compressor. Such gas seal assemblies can be constructed by various components.

Particularly, such a gas chamber assembly is disclosed in US Patent No. 6,601,854 entitled Shaft seal (Applicant: DRESSER-RAND COMPANY). Hereinafter, a conventional gas chamber assembly will be described in detail with reference to FIG.

1 is a cross-sectional view showing a conventional gas chamber assembly 1;

Referring to FIG. 1, a conventional gas seal assembly 1 includes an inner sleeve 5 installed on a rotary shaft 6, a rotary sealing sleeve 4 inserted into the inner sleeve 5, a rotary sealing sleeve 4 (Not shown). In addition, the gas seal assembly 1 may include a force sleeve 9 in contact with the sealing sleeve 2. In addition, in the case of the above-described force sleeve 9, the connecting door sealing sleeve 2 can be pressed by the separate support sleeve 17 and the spring 10. Further, the support sleeve 20 can be installed in the seal housing 8. [

At this time, in the case of the gas chamber assembly formed as described above, the type of product is complicated and the driving method can be complicated. Particularly, the gas chamber assembly formed as described above can increase the processing cost and the number of assembly work due to an increase in the number of parts. Therefore, it is necessary to simplify the structure of the gas chamber assembly formed as described above.

U.S. Patent No. 6,601,854

Embodiments of the present invention seek to provide a gas chamber assembly that is simple in structure.

According to an aspect of the present invention, there is provided an internal combustion engine comprising: a rotating sealing sleeve inserted into and installed in an inner sleeve; a sealing sleeve installed to be in contact with the rotating sealing sleeve; and a pressing member urging the sealing sleeve toward the rotating sealing sleeve in contact with the sealing sleeve A seal housing having a sleeve, a seal sleeve spaced apart from the seal sleeve by a predetermined distance, one surface of the force sleeve being disposed below the bottom surface, and at least two And a resilient portion provided between the threaded housing and the force sleeve to provide a restoring force to the force sleeve.

The apparatus may further include a first sealing portion disposed at a portion where the inner sleeve and the rotating sealing sleeve contact each other and installed to be inserted into the inner sleeve.

The rotating sealing sleeve and the sealing sleeve may be in surface contact with each other.

The apparatus may further include a sealing member installed between the sealing sleeve and the force sleeve, the second sealing member contacting the sealing sleeve and the force sleeve.

In addition, at least one of the force sleeve and the thread housing may have an elastic part insertion groove into which a part of the elastic part is inserted.

The at least two third sealing portions may be provided between the force sleeve and the bottom surface of the threaded housing such that the third sealing portions are spaced from each other by a predetermined distance in the longitudinal direction of the inner sleeve.

The bottom surface of the seal housing having the at least two or more third sealing portions may be formed to be inclined in both directions about the at least two or more third sealing portions.

In addition, the inclination formed on the bottom surface of the seal housing may be formed to be higher in the longitudinal direction of the rotary shaft between the at least two or more third sealing portions.

In addition, the force sleeve may include a movable block provided with the elastic portion, spaced apart from the threaded housing by a predetermined distance, and a support block formed to be bent from the movable block to the bottom side of the threaded housing.

The embodiments of the present invention can effectively block the flow of the gas generated along the rotation axis of the rotation shaft with a simple structure. In addition, embodiments of the present invention can reduce the number of parts compared to conventional gas-seal assemblies, thereby simplifying the assembly process and reducing the fabrication cost and the number of assemblies.

In addition, embodiments of the present invention can simplify the structure by utilizing the leverage effect that the ringage mechanism necessary for effectively blocking the gas has to have.

1 is a cross-sectional view showing a conventional gas chamber assembly.
2 is a cross-sectional view illustrating a gas seal assembly according to an embodiment of the present invention.
3 is a sectional view showing the operation of the gas chamber assembly shown in Fig.
4 is an enlarged cross-sectional view showing part A of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

2 is a cross-sectional view showing a gas seal assembly 100 according to an embodiment of the present invention.

The gas seal assembly 100 may include an inner sleeve 110 into which the rotating shaft S is inserted. At this time, a space is formed inside the inner sleeve 110, so that the outer circumferential surface of the rotating shaft S and the inner circumferential surface of the inner sleeve 110 can contact the rotating shaft S inserted therein.

Particularly, the inner sleeve 110 may include a first body portion 111 having a hollow formed therein, into which the rotation axis S is inserted. At this time, a seal ring (O) is installed in the first body part 111 to seal the rotation axis S from the base body.

The inner sleeve 110 may include a first coupling portion 112 formed to extend from the first body portion 111 and protrude in the outer circumferential direction of the rotation axis S. [ The first coupling part 112 may be formed by bending the first body part 111 and may include a seating groove 113 formed by bending the end of the first coupling part 112 to receive and accommodate a rotary sealing sleeve 120 to be described later .

Meanwhile, the gas seal assembly 100 may include a rotating sealing sleeve 120 inserted into the inner sleeve 110. At this time, the rotating sealing sleeve 120 can be in surface contact with the inner surface of the seating groove 113. Specifically, the rotating sealing sleeve 120 may be fitted and fixed to the seating groove 113.

The gas seal assembly 100 may include a first sealing portion 130 disposed between the rotating sealing sleeve 120 and the inner sleeve 110. At this time, the first sealing part 130 may be installed at a portion where the rotating sealing sleeve 120 and the inner sleeve 110 are in contact with each other.

Specifically, the first sealing portion 130 may be installed to be inserted into at least one of the rotating sealing sleeve 120 and the inner sleeve 110. For example, the first sealing portion 130 may be inserted into the rotating sleeve 120 or into the inner sleeve 110. The first sealing part 130 may be partially inserted into the rotating sealing sleeve 120 and the inner sleeve 110, respectively. Hereinafter, for convenience of explanation, the first sealing part 130 is installed to be inserted into the inner sleeve 110 will be described in detail.

When the first sealing part 130 is inserted into the inner sleeve 110 as described above, the first insertion groove 114 may be formed in the inner sleeve 110. At this time, the first insertion groove 114 may be formed to be pulled in from the inner surface of the seating groove 113.

Meanwhile, the first sealing part 130 may be formed in various ways. For example, the first sealing portion 130 may include an O-ring. Also, the first sealing part 130 may include a U-shaped seal.

At this time, since the O-ring or U-shaped chamber corresponds to a general configuration, a detailed description will be omitted. Hereinafter, the case where the first sealing part 130 includes a U-shaped seal will be described in detail.

The first sealing part 130 may include a first sealing member 131 formed to open at one side thereof. The first sealing part 130 may include a first elastic member 132 disposed inside the first sealing member 131. At this time, the first sealing member 131 may be formed of an elastic material to generate a restoring force around the opened portion. Further, the open portion of the first sealing member 131 may be disposed so as to face the flow direction of the gas around the direction in which the gas flows.

The first sealing part 130 formed as described above may block the gas flowing along the portion where the inner sleeve 110 and the rotating sealing sleeve 120 contact each other. Specifically, the flowing gas as described above may be stored in the first sealing member 131 by flowing into the open portion of the first sealing member 131. In addition, the gas flowing as described above can be secondarily blocked by the first elastic member 132.

Meanwhile, the gas seal assembly 100 may include a sealing sleeve 140 installed to contact the rotating sealing sleeve 120. At this time, the sealing sleeve 140 and the rotating sealing sleeve 120 may be in surface contact with each other.

The gas seal assembly 100 may also include a force sleeve 150 that contacts the sealing sleeve 140 and urges the sealing sleeve 140 toward the rotating sealing sleeve 120. At this time, the force sleeve 150 may apply the sealing sleeve 140 to prevent the sealing sleeve 140 and the force sleeve 150 from falling off.

Further, the force sleeve 150 may be formed to be bent. The force sleeve 150 may include a movable block 151 provided with an elastic portion 195 and spaced apart from the threaded housing 160 by a predetermined distance. At this time, the movable block 151 may be formed in the outer circumferential direction of the rotation axis S. In particular, the moving block 151 may be formed to be in surface contact with the sealing sleeve 140 as described above.

In addition, the force sleeve 150 may include a support block 152 that is configured to bend from the mobile block 151 to the bottom side of the seal housing 160. At this time, the support block 152 may be formed in the longitudinal direction of the rotation axis S. In particular, the movable block 151 and the support block 152 may be connected to form a right angle with respect to each other.

The gas seal assembly 100 may include a second sealing portion 170 disposed between the sealing sleeve 140 and the force sleeve 150. At this time, the second sealing portion 170 may be formed to be the same as or similar to the first sealing portion 130 described above. Hereinafter, for convenience of explanation, the second sealing portion 170 includes a U-shaped seal will be described in detail.

The second sealing portion 170 may include a second sealing member 171 and a second elastic member 172. At this time, the second sealing member 171 and the second elastic member 172 are the same as the first sealing member 131 and the first elastic member 132 described above, and thus the detailed description is omitted.

The second sealing portion 170 may be installed to be inserted into at least one of the sealing sleeve 140 and the force sleeve 150. Specifically, the second sealing portion 170 may be inserted into the sealing sleeve 150 or inserted into the sealing sleeve 150. Also, a portion of the second sealing portion 170 may be inserted into the sealing sleeve 140 and the force sleeve 150, respectively. Hereinafter, the second sealing portion 170 is inserted into the force sleeve 150 for convenience of explanation.

Meanwhile, the second insertion groove 150a may be formed in the portion of the force sleeve 150 that contacts the sealing sleeve 140, such that the second sealing portion 170 is inserted. At this time, the second insertion groove 150a may be formed at various positions. Particularly, the second insertion groove 150a can be installed at an optimum position so that the force applied by the force sleeve 150 can be exactly applied to the sealing sleeve 140.

The second sealing portion 170 may block the gas flowing into the portion where the sealing sleeve 140 and the force sleeve 150 contact each other. Specifically, a portion of the second sealing portion 170 may be inserted into the force sleeve 150 so as to protrude toward the sealing sleeve 140 side.

The gas seal assembly 100 may include an actual housing 160 spaced apart from the force sleeve 150 and the seal sleeve 140 to support the force sleeve 150. At this time, the threaded housing 160 may be installed so as not to contact the outer circumferential surface of the force sleeve 150 and the outer circumferential surface of the sealing sleeve 140. In particular, the threaded housing 160 may not contact the force sleeve 150 to allow the force sleeve 150 to move.

Further, the seal housing 160 may be installed inside the outer case C. At this time, a surface contact may be made between the threaded housing 160 and the outer case C, and a sixth sealing portion 193 may be provided at a portion where the threaded housing 160 and the outer case C are in contact with each other.

The gas seal assembly 100 may include at least two third sealing portions 180 that are provided between the force sleeve 150 and the bottom surface of the seal housing 160. At this time, the at least two third sealing portions 180 may be formed to be the same as or similar to the first sealing portions 130 described above.

Hereinafter, for the sake of convenience of explanation, the case where at least two or more third sealing portions 180 include a U-shaped seal will be described in detail. For convenience of explanation, the number of the at least two third sealing portions 180 is two, while the two third sealing portions 180 are the fourth sealing portion 181 and the fifth sealing portion 182, respectively. Will be described in detail.

The fourth sealing portion 181 may include a fourth sealing member 181a and a fourth elastic member 181b. The fifth sealing portion 182 may include a fifth sealing member 182a and a fifth elastic member 182b. The fourth sealing member 181a and the fifth sealing member 182a are the same as the first sealing member 131 described above and the fifth elastic member 181b and the fifth elastic member 182b are the same as the first sealing member 131 described above Described first elastic member 132, detailed description thereof will be omitted.

The fourth sealing portion 181 and the fifth sealing portion 182 may be installed to be inserted into the force sleeve 150 or the threaded housing 160. Specifically, the fourth sealing portion 181 and the fifth sealing portion 182 may be inserted into the force sleeve 150 or inserted into the thread housing 160.

Hereinafter, the fourth sealing portion 181 and the fifth sealing portion 182 are inserted into the force sleeve 150 for convenience of explanation.

When the fourth sealing portion 181 and the fifth sealing portion 182 are provided on the force sleeve 150 as described above, the third sealing portion 180 is inserted into the outer surface of the force sleeve 150, 3 insertion groove 150c and a fourth insertion groove 150d may be formed. The third insertion groove 150c and the fourth insertion groove 150d formed in the force sleeve 150 may be formed on the upper surface of the support block 152 opposite to the bottom surface of the seal housing 160. [

The fourth sealing portion 181 and the fifth sealing portion 182 installed as described above can block the gas flowing into the portion where the bottom surfaces of the moving block 151 and the seal housing 160 face each other. Specifically, the fourth sealing portion 181 and the fifth sealing portion 182 block the space between the moving block 151 and the bottom surface of the seal housing 160, thereby blocking the flowing gas as described above.

At this time, the bottom surface of the threaded housing 160 may be formed to be inclined. In particular, the bottom surface of the threaded housing 160 may be formed to be inclined to both sides with respect to a part.

The bottom surface of the seal housing 160 may be inclined in the longitudinal direction of the rotary shaft S about the fourth sealing portion 181 and the fifth sealing portion 182. [ Particularly, the inclination of the bottom surface of the seal housing 160 can be formed to be higher as the distance from the fourth sealing portion 181 and the fifth sealing portion 182 increases.

The gas seal assembly 100 may include a positioning sleeve 190 connected to the inner sleeve 110 and in contact with the rotating sealing sleeve 120. At this time, the positioning sleeve 190 is hollowed inside and the rotation axis S can be inserted. In addition, the positioning sleeve 190 may be connected to the inner sleeve 110 by a coupling member B such as a bolt or the like.

The gas seal assembly 100 may include an elastic portion 195 disposed between the seal housing 160 and the force sleeve 150 to provide a restoring force to the force sleeve 150. In particular, the elastic portion 195 may be installed between the moving block 151 and the seal housing 160. At this time, the elastic portion 195 may be formed in various ways. For example, the elastic portion 195 may be formed of a rubber member. Further, the elastic portion 195 may include a spring.

At least one of the seal housing 160 and the force sleeve 150 may be formed with elastic portion insertion grooves 150b and 160b into which the elastic portion 195 is inserted. The elastic member insertion grooves 150b and 160b may be formed in the seal housing 160 or the force sleeve 150 and may be formed in the seal housing 160 and the force sleeve 150, respectively.

Particularly when the elastic part insertion grooves 150b and 160b are respectively formed in the threaded housing 160 and the force sleeve 150 and the elastic part 195 is inserted into the elastic part 195, It is possible to prevent the position from deviating.

Hereinafter, the operation of the gas seal assembly 100 and the sealing method of the gas will be described in detail.

3 is a sectional view showing the operation of the gas chamber assembly 100 shown in Fig. 4 is an enlarged cross-sectional view showing part A of FIG.

3 and 4, the gas seal assembly 100 may be installed on the rotation axis S. At this time, the gas seal assembly 100 may be installed in a device for compressing a gas such as a compressor (not shown) and supplying it to the outside. Hereinafter, the gas seal assembly 100 will be described in detail with reference to the case where the gas seal assembly 100 is used in the compressor for convenience of explanation.

Such a compressor must shut off the gas flowing into the rotary shaft S when rotating the rotary shaft S due to its life or the like. Therefore, the gas seal assembly 100 can prevent the flowing gas from moving toward the longitudinal direction side of the rotating shaft S as described above.

Specifically, when the rotary shaft S rotates, an external gas may flow into the interior through an impeller (not shown). At this time, the gas introduced into the inside can flow in the longitudinal direction of the rotation axis S.

Particularly, in the case of the above-described flowing gas, it is possible to flow between the outer case C and the inner sleeve 110. At this time, the gas may flow into the space between the inner sleeve 110 and the rotating sealing sleeve 120.

The gas may also flow into the space between the rotating sealing sleeve 120 and the sealing sleeve 140. The gas may flow into the space between the force sleeve 150 and the sealing sleeve 140. In addition, the gas may flow into the space between the force sleeve 150 and the seal housing 160.

At this time, the gas flowing in the space between the inner sleeve 110 and the rotating sealing sleeve 120 may be blocked by the first sealing part 130 as described above. In addition, the gas flowing between the rotating sealing sleeve 120 and the sealing sleeve 140 may be blocked through surface contact between the rotating sealing sleeve 120 and the sealing sleeve 140.

The gas flowing through the space between the force sleeve 150 and the sealing sleeve 140 may be blocked by the second sealing portion 170. In the case of the gas flowing into the space between the force sleeve 150 and the seal housing 160, the fourth sealing portion 181 and the fifth sealing portion 182 may block the gas.

On the other hand, in the case of the above-mentioned flowing gas, the pressure can be increased toward the impeller side in the longitudinal direction of the rotating shaft S on which the impeller is installed. Further, the gas may be formed to have a smaller pressure as it moves away from the impeller side about the longitudinal direction of the rotary shaft (S).

Therefore, the flow of air may occur due to the pressure difference as described above. At this time, the flow of the air as described above can remove the lubricant supplied to the rotating shaft (S). Particularly, when the lubricant is removed as described above, wear of the rotation shaft S may occur due to rotation of the rotation shaft S, and thus the service life of the rotation shaft S may be shortened.

At this time, in order to prevent the above-described problems, the gas can be prevented from flowing through the first to third sealing portions 130 to 181.

However, since the space between the rotating sealing sleeve 120 and the sealing sleeve 140 is not provided with a separate sealing portion, it can greatly affect the service life of the rotating shaft S depending on how well the surface contact is maintained.

Specifically, the rotating sealing sleeve 120 and the sealing sleeve 140 can be in surface contact as described above. At this time, the rotating sealing sleeve 120 and the sealing sleeve 140 may be spaced apart from each other due to a tolerance in installation and rotation of the rotating shaft S, In particular, the rotation sealing sleeve 120 and the sealing sleeve 140 may be separated from each other due to the influence of resonance or the like due to the rotation of the rotation axis S without being in surface contact with each other.

At this time, the sealing sleeve 140 can move so as to move away from the other end about the one end of the rotating sealing sleeve 120. When the sealing sleeve 140 is separated from the rotating sealing sleeve 120 as described above, the sealing sleeve 140 can move toward the force sleeve 150.

When the movable block 151 moves as described above, the movable block 151 moves to the side of the threaded housing 160 so that the elastic block 195 can be moved. The elastic part 195 is compressed according to the movement of the moving block 151 to store the restoring force, and can provide the restoring force to the moving block 151. Particularly, the elastic part 195 is inserted into the elastic part insertion grooves 150b and 160b so that it can be prevented from being twisted or moved out of the elastic part insertion grooves 150b and 160b according to the movement of the movement block 151 have.

When the restoring force is provided from the elastic part 195 as described above, the moving block 151 can exert a force on the sealing sleeve 140. In particular, the moving block 151 may engage the rotating sealing sleeve 120 such that the sealing sleeve 140 is in surface contact with the rotating sealing sleeve 120.

The sealing sleeve 140 can maintain surface contact with the rotating sealing sleeve 120 by applying the sealing sleeve 140 to the rotating sealing sleeve 120 as described above.

When the force sleeve 150 moves as described above, the support block 152 can move toward the seal housing 160 together with the movement block 151. [ At this time, the upper surface of the support block 152 can move on the bottom surface of the seal housing 160.

The support block 152 can move in various directions without moving in parallel with the bottom surface of the seal housing 160 when the other end of the seal sleeve 140 rotates about one end.

At this time, the support block 152 can be linearly moved by the inclination of the bottom surface of the threaded housing 160. Specifically, when the movable block 151 moves as described above, the supporting block 152 can move from the fourth sealing portion 181 to the fifth sealing portion 182 side. Particularly, when the supporting block 152 moves as described above, the fourth sealing portion 181 moves in contact with the lowered portion of the bottom of the threaded housing 160, can do.

On the contrary, when the support block 152 moves, the fifth sealing portion 182 moves while contacting the lower side of the slope of the bottom of the seal housing 160, .

Therefore, when the support block 152 moves as described above, the fourth and fifth sealing portions 181 and 182 can move the support block 152 in the direction of the rotation axis S, respectively. Since the fourth sealing portion 181 and the fifth sealing portion 182 force the support block 152 as described above, the support block 152 is moved in a linear motion can do.

Meanwhile, when the supporting block 152 moves as described above, the fourth sealing part 181 and the fifth sealing part 182 can prevent the support block 152 from rotating. Specifically, the moving block 151 may rotate together with the sealing sleeve 140 according to the motion of the sealing sleeve 140. At this time, since the supporting block 152 is supported by the fourth and fifth sealing portions 181 and 182, the moving block 151 may not rotate. In addition, rotation of the moving block 151 is prevented, so that the sealing sleeve 140 can be prevented from rotating.

Therefore, the gas seal assembly 100 is simple in structure and can effectively block the flow of gas generated along the rotation of the rotation axis S. In addition, since the gas chamber assembly 100 reduces the number of parts compared with the conventional gas chamber assembly, the assembling process is simple, and the machining cost and the number of assemblies can be reduced.

In addition, the gas seal assembly 100 can simplify the structure by utilizing a leverage effect, which is required to have a ringage mechanism necessary for effectively shutting off the gas.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover all such modifications and variations as fall within the true spirit of the invention.

100: gas chamber assembly 140: sealing sleeve
110: inner sleeve 150: force sleeve
111: first body part 160: thread housing
112: first coupling portion 161: support projection
113: seat groove 170: second sealing portion
114: first insertion groove 180: third sealing portion
120: rotating sealing sleeve 190: positioning sleeve
130: first sealing portion 193: sixth sealing portion
131: first sealing member 195: elastic member
132: first elastic member

Claims

A rotating sealing sleeve inserted and installed in the inner sleeve;
A sealing sleeve installed to contact the rotating sealing sleeve;
A force sleeve contacting the sealing sleeve to apply the sealing sleeve to the rotating sealing sleeve side;
An actual housing disposed at a predetermined distance from the force sleeve and the sealing sleeve, the one side of the force sleeve being disposed below the bottom;
At least two third sealing portions provided between the force sleeve and the bottom surface of the seal housing; And
And an elastic portion provided between the threaded housing and the force sleeve to provide a restoring force to the force sleeve.

The method according to claim 1,
And a first sealing portion disposed at a portion where the inner sleeve and the rotating sealing sleeve contact each other and installed to be inserted into the inner sleeve.

The method according to claim 1,
Wherein the rotating sealing sleeve and the sealing sleeve are in surface contact with each other.

The method according to claim 1,
And a second sealing portion disposed between the sealing sleeve and the force sleeve, the second sealing portion contacting the sealing sleeve and the force sleeve.

The method according to claim 1,
At least one of the force sleeve and the thread housing,
And an elastic part insertion groove into which a part of the elastic part is inserted.

The method according to claim 1,
Wherein the at least two third sealing portions are disposed between the force sleeve and the bottom surface of the seal housing so as to be spaced apart from each other by a predetermined distance in the longitudinal direction of the inner sleeve.

The method according to claim 6,
Wherein a bottom surface of the seal housing having at least two or more third sealing portions is formed to be inclined in both directions about a center between the at least two or more third sealing portions.

8. The method of claim 7,
Wherein a slope formed on a bottom surface of the seal housing is formed to be heightened in the longitudinal direction of the rotation shaft between the at least two or more third seal portions.

9. The method according to any one of claims 1 to 8,
The force sleeve
A moving block provided with the elastic portion and spaced apart from the threaded housing at a predetermined interval; And
And a support block formed to be bent from the movable block to a bottom surface side of the seal housing.