KR20150092951A - Pipe Connection Device - Google Patents

Abstract

The present invention relates to a pipe connection device comprising: a ring-shaped first flange, an outer face of which is connected to a first pipe and which includes a first accommodation groove forming a first corner with an inner face in an inner peripheral portion; a ring-shaped second flange, an outer face of which is connected to a second pipe and which includes a second accommodation groove facing opposed to the first accommodation groove and forming a second corner with an inner face in an inner peripheral portion; a center ring which is positioned between the first accommodation groove and the second accommodation groove, and includes a ring-shaped center ring body and a center ring inclination portion formed on an outer peripheral face of the center ring body and coming in contact with the first corner of the first accommodation groove and the second corner of the second accommodation groove; a ring-shaped protruding ring which is coupled in the direction of the outer peripheral face of the center ring; and an O ring which is placed on the outer peripheral face of the protruding ring, wherein when the first flange is engaged with the second flange, the center ring inclination portion of the center ring comes in contact with the first corner and the second corner and is pressed.

Description

[0001] PIPE CONNECTION DEVICE [0002]

The present invention relates to a pipe connecting apparatus.

Semiconductor process lines include various process chambers and piping lines connecting the vacuum pump and the process chamber to the vacuum pump. The piping line is connected by a piping connection device including a centering and o-ring and a clamp disposed between the flange and flange coupled to the end of the piping line.

1 is a schematic cross-sectional view for explaining a pipe connecting apparatus according to the prior art. 1, includes a flange 10, 20, a centering ring 30, an O-ring 40, and a clamp 50. The flange 10, The flanges 10 and 20 are coupled to end portions of the first pipe 1 and the second pipe 2 so as to face each other and the centering ring 30 is connected to the flanges 10 and 20 in a state where the O- 20). The clamp 50 surrounds the flanges 10 and 20 and presses the flanges 10 and 20 and the O-ring 40 to engage the flanges 10 and 20 and the centering ring 30. The flanges 10 and 20 and the centering ring 30 are assembled while forming a vertical gap and a horizontal gap due to design tolerances and machining tolerances. The vertical clearance is formed between 0.2 and 0.3 mm between the flanges 10 and 20 and the outer surface of the centering ring 30. [ The horizontal clearance is formed to be 0.4 to 0.6 mm between the flanges (10, 20) and both side surfaces of the centering ring (30).

The piping connection device is capable of generating frictional heat of several tens to several hundreds of degrees Celsius due to friction vibrations of several KHz or more generated between the centering ring 30 and the flanges 10 and 20 due to the vertical clearance and the horizontal clearance, Occurs. Therefore, the temperature of the centering ring 30 and the O-ring 40 is increased to accelerate the hardening and corrosion of the O-ring 40, causing gas leakage and causing safety of various process equipment and environment.

An object of the present invention is to provide a pipe connecting device capable of reducing the friction between the centering and the flange due to external vibrations.

According to an aspect of the present invention, there is provided a piping connection apparatus including a first pipe having an outer surface connected to a first pipe, a first receiving groove formed at an inner peripheral portion of the inner pipe, A second flange having an outer surface connected to the second pipe and having a second receiving groove facing the first receiving groove and forming a second edge with an inner surface of the inner peripheral portion; 1 centering body and a centering body formed on the outer circumferential surface of the centering body and being in contact with a first edge of the first receiving groove and a second corner of the second receiving groove, A center ring having a centering inclined portion, a ring-shaped protruding ring coupled to an outer circumferential surface of the center ring, and an O-ring seated on an outer circumferential surface of the protruding ring, wherein when the first flange and the second flange are engaged, Additional centering slope of the gettering is characterized in that the pressing in contact with the first edge and a second edge. The first receiving groove has a first bottom surface parallel to the inner surface of the first flange and a first inner circumferential surface parallel to the inner circumferential surface of the second flange, Wherein the second receiving groove has a second bottom surface parallel to the inner surface of the second flange and a second inner circumferential surface parallel to the inner circumferential surface of the second flange, An edge may be formed by the inner surface of the second flange and the second inner circumferential surface.

The centering body may further include a centering groove formed in a ring shape on an outer circumferential surface thereof. The centering tilting portion is formed by being protruded from the outer circumferential surface of the centering body at both sides of the centering groove, Sectional shape may be formed to have a triangular shape. The centering inclined portion may be inclined with respect to the inner surface of the first flange and the second flange and may be inclined to be contacted with the first and second edges and a lower surface contacting the outer circumferential surface of the centering ring, As shown in FIG. The protruding ring is ring-shaped and includes a protruding ring body coupled to the centering groove and a protruding portion protruding from both sides of the protruding ring body, and the protruding portion is formed when the first flange and the second flange are fastened , And both side surfaces thereof contact the inner surfaces of the first flange and the second flange.

Also, the centering body may be formed to increase in length toward the outer circumferential surface. When the first flange and the second flange are engaged, the outer circumferential portions of both side surfaces may be pressed and contacted with the first flange and the second flange. At this time, the centering body may further include a V-shaped or U-shaped centering peripheral groove having a predetermined depth at both sides of the outer circumferential surface. The protruding portion of the protruding ring may further include at least one protruding groove formed in a V-shape or a U-shape at a predetermined depth on both sides.

The centering inclined portion may be inclined to be gradually inclined from the centering groove to both side surfaces of the centering body, and a lower surface contacting the outer circumferential surface of the centering body between both side surfaces of the centering body and the centering groove, And a vertical surface extending in an outward direction of the centering body. The centering body may further include centering side grooves formed on both sides of the centering body in a V-shape or a U-shape at a predetermined depth.

The pipe connecting device of the present invention comprises a ring-shaped first flange having an outer surface connected to the first pipe and a first receiving groove formed at an inner peripheral portion of the inner peripheral surface to form a first edge, A second ring-shaped flange connected to the second pipe and having a second receiving groove facing the first receiving groove and forming an inner side surface and a second edge in an inner peripheral portion; And a centering inclined portion formed on the outer peripheral surface of the centering body and in contact with the first edge of the first receiving groove and the second edge of the second receiving groove, Shaped centering ring and a ring-shaped protruding ring coupled to an outer peripheral surface of the centering ring and extending to an outer circumferential surface of the first flange and the second flange, the protruding ring comprising a ring- And protruding grooves formed on both side surfaces of the main body and formed by V-shaped or U-shaped grooves having predetermined depths on both sides. At this time. The centering body may be formed to increase in length toward the outer circumferential surface, and the centering body may further include a V-shaped or U-shaped centering outer circumferential groove having a predetermined depth at both sides of the outer circumferential surface.

In the piping connection apparatus of the present invention, the centering ring and the protruding ring may be integrally formed.

The pipe connecting device of the present invention comprises a ring-shaped first flange having an outer surface connected to the first pipe and a first receiving groove formed at an inner peripheral portion of the inner peripheral surface to form a first edge, A second ring-shaped flange connected to the second pipe and having a second receiving groove facing the first receiving groove and forming an inner side surface and a second edge in an inner peripheral portion; A center ring having a centering edge formed in a ring shape and formed by an outer circumferential surface and both side surfaces, a ring-shaped protruding ring coupled to an outer circumferential surface of the center ring, and a ring- The first receiving groove of the first flange and the second receiving groove of the second flange may include an inclined surface contacting the centering edge. The first receiving groove includes a first bottom surface parallel to an inner surface of the first flange, a first inner surface parallel to an inner circumferential surface of the first flange, and a second inner surface defined between the first bottom surface and the first inner circumferential surface. Wherein the second receiving groove has a second bottom surface parallel to an inner surface of the second flange, a second inner circumferential surface parallel to an inner circumferential surface of the second flange, and a second inner circumferential surface between the second bottom surface and the second inner circumferential surface, And the first inclined surface and the second inclined surface may be formed so as to contact and press the centering edge when the first flange and the second flange are engaged with each other. The first receiving groove may have a first bottom surface that is parallel to the inner side surface of the first flange and a first inner circumferential surface that is inclined to the inner circumferential surface of the first flange and has an obtuse angle with the first bottom surface, The second receiving groove has a second bottom surface that is a plane parallel to the inner side surface of the second flange and a second inner circumferential surface that is inclined to the inner circumferential surface of the second flange and has an obtuse angle with the second bottom surface, The first inner circumferential surface and the second inner circumferential surface may be formed to be contacted with the centering edge so as to be pressed.

The pipe connection device of the present invention includes a centering body having a ring shape and a centering inclined portion formed on an outer circumferential surface of the centering body and having an inclined surface to be pressed against an edge formed on an inner surface of the first flange and the second flange A centering ring, and a ring-shaped protrusion ring coupled to an outer peripheral surface of the centering ring. At this time, the centering and the protruding ring may be integrally formed.

The pipe connecting apparatus of the present invention has the effect of preventing the hardening or corrosion of the O-ring due to frictional heat by reducing friction due to external vibration by fixing by centering and pressing of the flange.

The piping connection device of the present invention improves the sealing force by sealing the flange and the center ring by compression, and has the effect of preventing the corrosion or hardening of the O-ring by the corrosive gas.

1 is a cross-sectional view of a pipe connecting apparatus according to the prior art.
FIG. 2A is a cross-sectional view of a pipe connecting apparatus according to an embodiment of the present invention.
FIG. 2B is a cross-sectional view of the piping connection apparatus according to another embodiment of the present invention. FIG.
3A is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention.
FIG. 3B is a cross-sectional view of the pipe connecting apparatus according to another embodiment of the present invention. FIG.
4A is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention.
FIG. 4B is a cross-sectional view of the pipe connecting apparatus according to another embodiment of the present invention after fastening; FIG.
5 is a cross-sectional view of a piping connection apparatus according to another embodiment of the present invention.
6 is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention.
7 is a cross-sectional view of a piping connection apparatus according to another embodiment of the present invention.
8 is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention.
9 is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention after fastening.
10 is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention after fastening.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

First, a piping connection apparatus according to an embodiment of the present invention and another embodiment will be described.

FIG. 2A is a cross-sectional view of a pipe connecting apparatus according to an embodiment of the present invention. FIG. 2B is a cross-sectional view of the piping connection apparatus according to another embodiment of the present invention. FIG.

2A, a pipe connecting apparatus 100 according to an embodiment of the present invention includes a first flange 110, a second flange 120, a centering ring 130, a protruding ring 140, An O-ring 150, and a clamp 160. As shown in FIG. The pipe connection device 100 is located between the first pipe 1 and the second pipe 2 whose ends are opposed to each other and seals the first pipe 1 and the second pipe 2 by connecting them to each other .

In describing the components in the following embodiments, the inner surface of the first flange 110 and the inner surface of the second flange 120 refer to the surfaces facing each other, and the outer surface means the opposite surface of the inner surface. Further, both side surfaces of the centering ring and the protruding ring mean two outer surfaces opposed to the inner surface of the first flange 110 or the second flange 120, respectively. The inner circumferential surface of each component means a surface facing the central axis direction of the first flange 110 and the second flange 120, and the outer circumferential surface means the opposite surface. The outer circumferential portion of each component refers to a portion of each component that is relatively far from the central axis direction of the first flange 110 and the second flange 120 and the inner circumferential portion is a portion of the first flange 110 and the second flange 120, Means a portion of the second flange 120 close to the center axis direction. Further, the end face of each component means a side not in contact with other components.

At least one of the first pipe 1 and the second pipe 2 may be replaced with a stopper (not shown) for blocking the passage formed by the inner circumferential surface of the first flange 110 or the second flange 120 . In this case, the pipe connecting apparatus can be used as a device for sealing the inlet of a storage tank (not shown) having an injection port. For example, the inlet of the storage tank is connected to the outer surface of the first flange 110 by welding or the like instead of the first pipe 1, and the second pipe 2 is connected to the outer surface of the second flange 120. [ Instead, the stopper is coupled so that the pipe connection device can seal the inlet of the storage tank.

The first flange 110 is formed in a ring shape as a whole, and has a first receiving groove 112 in an inner peripheral portion of a plane inner surface. The outer surface of the first flange 110 is formed to be an inclined surface. The first flange 110 has an outer peripheral surface which is an outer diameter side and an inner peripheral surface which is an inner diameter side surface. The outer surface and the outer circumferential surface of the first flange 110 may be formed in various shapes according to the type of the clamp to be coupled. Also, the first flange 110 comes into contact with the O-ring 150 at the outer peripheral portion of the inner side.

The first receiving groove 112 is formed as a ring-shaped groove having a predetermined width and depth in the direction from the inner peripheral portion to the outer peripheral portion of the inner surface. That is, the first receiving groove 112 is formed with a first bottom surface 112a parallel to the inner surface and a first inner circumferential surface 112b parallel to the inner circumferential surface. The first receiving groove 112 forms a first edge 114 with an inner surface of the first flange 110. More specifically, the first flange 110 has a first edge 114 formed by a first inner circumferential surface 112b of the first receiving groove 112 and an inner surface of the first flange. The width of the first bottom surface 112a of the first receiving groove 112 and the height of the first inner circumferential surface 112b may be changed corresponding to the shape of the centering ring 130. [

The second flange 120 is formed in a symmetrical shape with respect to the first flange 110 and has a second receiving groove 122 on the inner side opposite to the first receiving groove 112. The second flange 120 has an inner surface opposed to the first flange 110 and an outer surface joined to an end of the second pipe 2.

The second receiving groove 122 is formed symmetrically with the first receiving groove 112 and has the same function as the first receiving groove 112. The second receiving groove 122 is formed with a second bottom surface 122a parallel to the inner side surface and a second inner circumferential surface 122b parallel to the inner circumferential surface of the second flange 120. [ The second receiving groove 122 forms a second edge 124 with an inner surface of the second flange 120. More specifically, the second flange 120 has a second edge 124 formed by the second inner peripheral surface 122b of the second receiving groove 122 and the inner surface of the second flange.

The centering 130 includes a centering body 132 and a centering slope 135. The centering ring 130 is positioned between the first bottom surface 112a of the first receiving groove 112 and the second bottom surface 122a of the second receiving groove 122. [ The centering 130 seals between the first flange 110 and the second flange 120 when the first flange 110 and the second flange 120 are fastened by the clamp 160, (1) and the second pipe (2). At this time, the centering 130 presses and seals the centering slope 135 while making a mechanical contact with the first edge 114 of the first flange 110 and the second edge 124 of the second flange 120 . The centering 130 seals between the first corner 114 and the second flange 120 and separates the space in which the O-ring 150 is located from the inside of the first pipe 1 and the second pipe 2 Separate.

The centering ring 130 may be made of any one of a metal material such as aluminum, copper, nickel or an alloy thereof, stainless steel, brass or the like, or a durable material such as a durable nonmetallic material such as Teflon, engineering plastic or reinforced plastic .

The centering body 132 is formed in a ring shape having a predetermined thickness and length. The centering body 132 includes a ring-shaped centering groove 133 formed along an outer circumferential surface thereof. The centering body 132 is formed such that the inner circumferential surface thereof is flush with the inner circumferential surfaces of the first flange 110 and the second flange 120. The centering body 132 is positioned between the first receiving groove 112 and the second receiving groove 122 such that both side faces thereof face the first receiving groove 112 and the second receiving groove 122, respectively. When the first flange 110 and the second flange 120 are fastened by the clamp 160, the centering body 132 may be formed with a first bottom surface 112a of the first flange 110 and a second bottom surface 112b of the first flange 110, And the second bottom surface 122a of the second substrate 120. [ The centering body 132 is in contact with both the first bottom surface 112a of the first flange 110 and the second bottom surface 122a of the second flange 120 on both sides, Thereby sealing between the first flange 110 and the second flange 120.

The centering groove 133 is formed in a ring shape along the outer circumferential surface of the centering body 132 and includes a bottom surface between the inner side surface and the inner side surface facing each other. A protruding ring 140 is inserted into the centering groove 133 and coupled thereto. The centering groove 133 has a length smaller than the distance between the inner surface of the first flange 110 and the inner surface of the second flange 120 when the first flange 110 and the second flange 120 are fastened .

The centering inclined portion 135 protrudes outwardly from the outer circumferential surface of the centering body 132 and has a triangular cross section cut in a direction parallel to the central axis of the centering ring 130, Respectively. That is, the centering inclined portion 135 is inclined with respect to the inner surface of the first flange 110 and the second flange 120 and is inclined to contact the first edge 114 and the second edge 124, A lower surface 137 contacting the outer circumferential surface of the centering body 132 and a vertical surface 138 extending in the outward direction of the centering body 132. [ The centering inclined portions 135 are formed on both sides of the centering groove 133 of the centering body 132 and are formed so that the vertical surfaces 138 face each other. The vertical surface 138 of the centering slope 135 is preferably flush with the inner surface of the centering groove 133. The centering inclined portion 135 is formed such that the length of the lower surface 137 is smaller than the length of the outer circumferential surface of the centering body 132. Accordingly, the centering inclined portion 135 is partially protruded from the outer circumferential surface of the centering body 132. The centering slope 135 is preferably formed integrally with the centering body 132.

The centering slope 135 is formed such that the sloped surface 136 is inclined while facing the first edge 114 of the first flange 110 and the second edge 124 of the second flange 120. When the first flange 110 and the second flange 120 are fastened to each other, the centering slope 135 is pressed or contacted with the first edge 114 and the second edge 124 in a line or surface contact, do. In addition, since the inclined surface 136 of the centering inclined portion 135 is inclined, the centering inclined portion 135 can be more effectively contacted with the first edge 114 and the second edge 124. Since the centering inclined portion 135 is pressed and engaged with the first flange 110 and the second flange 120, the centering ring 130 can be prevented from vibrating with the first flange 110 and the second flange 120, Friction is not generated. Even if the centering 130 does not have a constant vertical clearance between the outer circumferential surface and the first inner circumferential surface 112b of the first flange 110 and the second inner circumferential surface 122b of the second flange 120, 135, respectively.

The protruding ring 140 is formed to include a protruding ring body 142 and a protrusion 144. At least one surface of the protruding ring 140 including the inner circumferential surface of the protruding ring body 142 is brought into contact with the center ring 130 to be engaged. The protruding ring 140 is positioned between the first flange 110 and the inner surface of the second flange 120. The protrusion ring 140 may be supported by an O-ring 150 mounted on the outer circumferential surface thereof. The protruding ring 140 may be made of any one of a metal material such as aluminum, copper, nickel or an alloy thereof, stainless steel, brass or the like, or a durable non-metallic material such as Teflon, engineering plastic or reinforced plastic.

The protruding ring body 142 is formed in a ring shape having a predetermined length and thickness, and is coupled to the centering body 132. The protruding ring main body 142 is preferably inserted and engaged with the centering groove 133 of the centering body 132 by the inner peripheral portion. The protruding ring body 142 is formed to have a length corresponding to the length of the centering groove 133. The protruding ring body 142 has an O-ring groove 143 on which an O-ring 150 is seated. The O-ring groove 143 is formed in an arc shape corresponding to the outer circumferential surface of the O-

The protrusions 144 protrude from both sides of the protrusion ring body 142 and are formed to have a ring shape as a whole. The protruding portion 144 is protruded from an area not inserted into the centering groove 133 when the protruding ring body 142 is engaged with the centering body 132. At this time, the protruding portion 144 may contact the outer circumferential portion of the centering inclined portion 135 with the inner circumferential portion. The protrusion 144 preferably has a length such that both sides of the first flange 110 and the second flange 120 are in contact with the inner surfaces of the first flange 110 and the second flange 120, . The projecting portion 150 does not protrude beyond the point where the inclined surface and the inner circumferential surface of the centering inclined portion 135 meet and the inclined surface 136 contacts the first edge 114 and the second edge 124 to be pressed It is formed so as not to interfere. The protruding portion 144 is in contact with the inner surfaces of the first flange 110 and the second flange 120 at both sides when the first flange 110 and the second flange 120 are engaged, It is possible to seal between the inner surface of the first flange 110 and the inner surface of the second flange 120.

The O-ring 150 may be an O-ring of a general pipe fastening device used in a semiconductor process line. In addition, the O-ring 150 may be formed of a material such as perfluor and viton. The O-ring 150 is coupled to the O-ring groove 143 of the protruding ring body 142 of the protruding ring 140 between the inner surface of the first flange 110 and the inner surface of the second flange 120. Accordingly, the O-ring 150 is compressed when the first flange 110 and the second flange 120 are fastened by the clamp 160, so that the inner surface of the first flange 110 and the inner surface of the second flange 120 Thereby sealing between the inner side surfaces. The centering 130 prevents the process gas or reaction by-product particles from coming into contact with the O-ring 150, thereby preventing a reduction in life due to hardening or corrosion. Accordingly, the O-ring 150 has a longer replacement period than that of the conventional pipe connection apparatus and prevents leakage of the process gas for a long time. The need for the O-ring 150 to be formed of an expensive perfluoric material is reduced.

The clamp 160 is used as a quick coupler commonly used in piping fastening devices. The clamp 160 has a flange receiving groove 162 formed therein to receive the outer circumferential portion of the first flange 110 and the second flange 120. Accordingly, the clamp 160 presses the first flange 110 and the second flange 120 while the first flange 110 and the second flange 120 are in the flange receiving grooves 162.

Accordingly, the pipe connection apparatus 100 is configured such that the centering slope 135 is closed firstly, the protrusion ring 140 is closed secondarily, and the O-ring 150 is closed in a third order so that the first flange 110 It is possible to seal the second flange 120 more completely. Since the centering inclined portion 135 of the pipe connecting apparatus 100 is press-coupled with the first flange 110 and the second flange 120, the centering and protruding ring, the first flange 110, The friction due to the vibration does not occur between the first and second plates 120a and 120b. Therefore, the O-ring 150 is prevented from being hardened or damaged due to frictional heat due to friction.

Referring to FIG. 2B, the pipe connection apparatus 100a according to another embodiment of the present invention includes a centering ring 130a and a protrusion ring 140a. That is, the centering 130a and the protruding ring 140a are formed in the same or similar shape as the centering ring 130 and the protruding ring 140 according to the embodiment of FIG. Since the protruding ring 140a is integrally formed with the center ring 130a, the protruding portion 144a formed on both sides of the protruding ring body 142a may be omitted. Also in the embodiments described below, the centering ring and the protruding ring constituting the pipe connecting device can be integrally formed.

Next, a piping connection apparatus according to another embodiment of the present invention will be described.

3A is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention. FIG. 3B is a cross-sectional view of the pipe connecting apparatus according to another embodiment of the present invention. FIG.

3A and 3B, a pipe connecting apparatus 200 according to another embodiment of the present invention includes a first flange 110, a second flange 120, a centering ring 230, (140), an O-ring (150), and a clamp (160). The piping connection device 200 according to another embodiment of the present invention has a different structure from the piping connection device 100 and the centering pipe 230 according to FIG. Therefore, the piping connection apparatus 200 according to another embodiment of the present invention will be described with reference to the centering 230. The same or similar parts to those of the piping connection device 200 of FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted here.

The centering 230 includes a centering body 232 and a centering slope 135.

The centering body 232 is formed such that the length of the outer circumferential surface is longer than the length of the inner circumferential surface, and the length is increased toward the outer circumferential surface. Accordingly, the centering body 232 is formed so that both side surfaces thereof are inclined. When the first flange 110 and the second flange 120 are fastened to each other, the outer circumferential portions of both side surfaces of the centering body 232 are connected to the first bottom surface 112a and the second flange 120 of the first flange 110, And is first pressed against the second bottom surface 122a. Accordingly, the pipe connecting device 200 is configured such that both side surfaces of the centering body 232 seal between the first flange 110 and the second flange 120, and the centering slope 135 is closed secondarily, The protruding ring 140 is closed by the third angle and the O-ring 150 is sealed by the quadrature so that the gap between the first flange 110 and the second flange 120 can be more completely sealed. The pipe connection device 200 is configured such that the centering body 232 and the centering inclined portion 135 are disposed at the first corner 114 of the first flange 110 and the second corner 124 of the second flange 120, So that friction due to vibration does not occur.

Next, a piping connection apparatus according to another embodiment of the present invention will be described.

4A is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention. FIG. 4B is a cross-sectional view of the pipe connecting apparatus according to another embodiment of the present invention after fastening; FIG.

4A and 4B, a pipe connecting apparatus 300 according to another embodiment of the present invention includes a first flange 110, a second flange 120, a centering 330, A ring 140, an O-ring 150, and a clamp 160. The piping connection device 300 according to another embodiment of the present invention has a different structure from the piping connection device 200 and the centering 330 according to FIGS. 3A and 3B. Therefore, the piping connection device 300 according to another embodiment of the present invention will be described with reference to the centering 330. [ The same or similar parts to those of the piping connection device 300 according to FIGS. 3A and 3B are denoted by the same reference numerals, and a detailed description thereof will be omitted.

The centering 330 includes a centering body 332 and a centering slope 135.

The centering body 332 includes centering peripheral grooves 334 formed on both sides of the outer circumferential surface. The centering peripheral groove 334 is formed in a V-shape or a U-shape at a predetermined depth in the direction of the inner peripheral surface along the outer peripheral surface of the centering body 332. The centering peripheral groove 334 is formed between both side surfaces of the centering body and the centering groove 133. Further, the centering peripheral groove 334 is preferably formed at a position adjacent to both side surfaces of the centering body 332 from the outer peripheral surface.

When the first flange 110 and the second flange 120 are coupled to each other, the centering body 332 is deformed so that both sides of the centering peripheral groove 334 are separated from the first bottom surface 112a of the first flange 110 And more closely contact the second bottom surface 122a of the second flange 120. [ Accordingly, the centering body 332 further seals the first flange 110 and the second flange 120 first. The centering body 332 can be formed in a manner such that the centering body 332 can efficiently and smoothly move the first and second flanges 110, It can be sealed.

Next, a piping connection apparatus according to another embodiment of the present invention will be described.

5 is a cross-sectional view of a piping connection apparatus according to another embodiment of the present invention.

5, a pipe connecting device 400 according to another embodiment of the present invention includes a first flange 110, a second flange 120, a centering 330, a protruding ring 440, An O-ring 150, and a clamp 160. The O- The piping connection device 400 according to another embodiment of the present invention is different in the structure of the piping connection device 300 and the protruding ring 440 according to FIGS. 4A and 4B. Therefore, the piping connection apparatus 400 according to another embodiment of the present invention will be described with reference to the protruding ring 440. The piping connection device 400 uses the same reference numerals as those of the piping connection device 300 according to FIGS. 4A and 4B, and a detailed description thereof will be omitted.

The protruding ring 440 is formed to include a protruding ring body 142 and a protrusion 444.

The protruding portion 444 further includes protruding grooves 445 extending from both sides in the direction of the protruding ring body 142. The projecting grooves 445 are formed in a ring shape along both side surfaces of the projecting portions 444, and are preferably formed in a V-shaped or U-shaped groove. The protrusion grooves 445 may be formed of at least one protrusion 444 and may be formed in an appropriate number according to the height of the protrusion 444. When the inner flanks of the first flange 110 and the second flange 120 are engaged with each other and both sides of the protruding portion 444 are contacted with each other, the protruding grooves 445 are more easily deformed, 1 flange 110 and the inner surface of the second flange 120, respectively.

Meanwhile, the protruding ring 440 may be integrally formed with the centering ring 330. At this time, the protruding ring 440 may be formed of a metal material such as stainless steel or a Teflon material. Preferably, the protruding ring 440 may be made of a non-ferrous metal such as copper or nickel having a relatively low hardness or a material such as Teflon .

Next, a piping connection apparatus according to another embodiment of the present invention will be described.

6 is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention.

6, the pipe connecting apparatus 500 according to another embodiment of the present invention includes a first flange 110, a second flange 120, a centering 530, a protruding ring 540, An O-ring 150, and a clamp 160. The O- The piping connection apparatus 500 according to another embodiment of the present invention has different structures of the pipe connection apparatus 100 according to FIG. 2, the centering 530, and the protruding ring 540. Accordingly, the piping connection apparatus 500 according to another embodiment of the present invention will be described with reference to the centering ring 530 and the protruding ring 540 as follows. The same or similar parts to those of the piping connection device 500 of FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted here.

The centering 530 includes a centering body 532 and a centering inclined portion 535.

The centering body 532 is formed in a ring shape having a predetermined thickness and length. The centering body 532 includes a centering groove 133 and a centering side groove 534. The centering side surface groove 534 is formed at a predetermined depth from both side surfaces of the centering body 532 and formed into a ring shape along both side surfaces. The centering side groove 534 may be formed in a V shape or a U shape. The centering side surface groove 534 is easily deformed at the both sides of the centering body 532 so that the first bottom surface 112a of the first flange 110 and the second bottom surface 122a of the second flange 120 So as to be in close contact with each other. Accordingly, the centering body 532 can seal the first flange 110 and the second flange 120 more effectively.

The centering inclined portion 535 is formed to protrude outward from the outer circumferential surface of the centering body 532 and is formed entirely except the region where the centering groove 133 is formed on the outer circumferential surface of the centering body 532. [ More specifically, the centering inclined portion 535 is formed so that the sectional shape cut in a direction parallel to the center axis of the centering 530 is a right triangle. That is, the centering inclined portion 535 has an inclined surface 536 formed in an inclined direction with the inner surfaces of the first flange 110 and the second flange 120 and a lower surface 537 contacting the centering body 532 And a vertical surface 538 extending in the outer direction of the centering body 532. As shown in Fig. The lower surface 537 of the centering inclined portion 535 may be formed to contact the outer circumferential surface of the centering body 532 between the centering grooves on both sides of the centering body 532. The inclined surface 536 of the centering inclined portion 535 is formed so that the height gradually decreases from the centering groove 133 to both side surfaces of the centering body 532. The centering inclined portion 535 is increased in contact area with the first edge 114 of the first flange 110 and the second edge 124 of the second flange 120 and the centering 530 Can be increased.

The protruding ring 540 is formed to include a protruding ring body 142 and a protrusion 544.

The protrusions 544 further include protruding grooves 545 extending from both sides in the direction of the protruding ring body 142. The protruding grooves 545 are formed in a ring shape along both side surfaces of the protruding portion 544, and are preferably formed as V-shaped or U-shaped grooves. The protrusion grooves 545 may be formed of at least one protrusion 544 and may be formed in an appropriate number according to the height of the protrusion 544. When the inner flanks of the first flange 110 and the second flange 120 are engaged with each other and both sides of the protruding portion 544 are contacted with each other, the protruding grooves 545 are more easily deformed, The first flange 110 and the second flange 120 can be brought into close contact with each other.

Meanwhile, the centering 530 and the protruding ring 540 may be integrally formed. At this time, centering side grooves 534 formed on both sides of the centering 530 may be omitted. In addition, protruding grooves 545 formed on both side surfaces of the protruding portion 544 may be omitted in the protruding ring 540. [ In this case, the pipe connection device 500 is configured such that the centering slope portion 535 of the centering 530 is positioned between the first edge 114 of the first flange 110 and the second edge 124 of the second flange 120 So that friction due to vibration generated in a direction perpendicular to the central axis of the centering 530 can be prevented from being generated. The pipe connecting device 500 is connected to the centering body 532 and the first and second flanges 110 and 120. The pipe connecting device 500 is connected to the centering body 532 and the first and second flanges 110 and 120, It is possible to effectively seal the gap even if the gap varies or the position is different.

Next, a piping connection apparatus according to another embodiment of the present invention will be described.

7 is a cross-sectional view of a piping connection apparatus according to another embodiment of the present invention.

7, a pipe connecting device 600 according to another embodiment of the present invention includes a first flange 110, a second flange 120, a centering 330, a protruding ring 640, And a clamp 160. The piping connection device 600 according to another embodiment of the present invention has a different structure of the pipe connection device 300 and the protruding ring 640 according to FIGS. 4A and 4B. Therefore, the piping connection apparatus 600 according to another embodiment of the present invention will be described with reference to the protruding ring 640. The piping connection device 600 uses the same reference numerals as those of the piping connection device 300 according to FIGS. 4A and 4B, and a detailed description thereof will be omitted.

4A and 4B, the O-ring 150 used in the pipe connection apparatus 300 is omitted, and only the first flange 110 (FIG. 4A) is formed by the centering ring 330 and the protruding ring 640, And the second flange 120, as shown in Fig.

The protruding ring 640 is formed to include a protruding ring body 642 and a protrusion 644. The protruding ring main body 642 is formed in a ring shape having a predetermined thickness extending from the centering ring 330 in the direction of the outer peripheral surface of the first flange 110 and the second flange 120. The protruding ring body 642 is preferably formed to a thickness that extends from the centering ring 330 to the outer circumferential surface of the first flange 110 and the second flange 120. [

The protrusion 644 further includes protrusion grooves 645 extending from both sides in the direction of the protrusion ring body 642. The protruding grooves 645 are formed in a ring shape along both side surfaces of the protruding portion 644, and are preferably formed as V-shaped or U-shaped grooves. The protrusions 645 may be formed of at least one protrusion 644 and may be formed as a plurality of protrusions 644 that are formed in the entire thickness of the protrusion 644 and spaced apart from each other. When the first flange 110 and the second flange 120 are fastened and the inner side surface is in contact with both sides of the protrusion 644, the protrusion 645 is deformed more easily as the protrusion 644 is deformed, 1 flange 110 and the inner surface of the second flange 120, respectively.

Next, a piping connection apparatus according to another embodiment of the present invention will be described.

8 is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention.

8, a pipe connecting apparatus 700 according to another embodiment of the present invention includes a first flange 110, a second flange 120, a centering ring 130, a protruding ring 640, And a clamp 160. The piping connection device 700 according to another embodiment of the present invention is different in the structure of the pipe connection device 100 and the centering ring 130 according to FIG. That is, the pipe connection device 700 is formed by a centering ring used in the pipe connection device 100 shown in FIG. Accordingly, the pipe connecting device includes the centering ring 130 of the pipe connecting device according to FIG. 2 and the protruding ring 640 according to FIG.

Next, a piping connection apparatus according to another embodiment of the present invention will be described.

9 is a cross-sectional view of a pipe connecting apparatus according to another embodiment of the present invention.

9, a pipe connecting apparatus 800 according to an embodiment of the present invention includes a first flange 810, a second flange 820, a centering 830, a protruding ring 840, An O-ring 150, and a clamp 160. As shown in FIG. The pipe connecting apparatus 800 according to another embodiment of the present invention includes the pipe connecting apparatus 100, the first flange 810, the second flange 820, the centering 830, The structure of the ring 840 is formed differently. Accordingly, in the following, a piping connection device 800 according to another embodiment of the present invention includes a first flange 810, a second flange 820, The centering 830, and the protruding ring 840, which are different from each other. The same or similar parts to those of the piping connection device 800 of FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted here.

The first flange 810 is formed in a ring shape and has a first receiving groove 812 at an inner peripheral portion of a plane inner surface. The first receiving groove 812 is formed in a ring shape having a predetermined width and depth in the direction from the inner peripheral portion to the outer peripheral portion of the inner surface. That is, the first receiving groove 812 is formed with a first bottom surface 812a, which is a plane parallel to the inner surface, and a first inner circumferential surface 812b, which is parallel to the inner circumferential surface. The first receiving groove 812 further includes a first inclined surface 812c formed between the first bottom surface 812a and the first inner circumferential surface 812b. The first inclined surface 812c is inclined at an obtuse angle with the first bottom surface 812a and the first inner circumferential surface 812b.

The second flange 820 is formed in a symmetrical shape with respect to the first flange 810 and the centering ring 830 and the O-ring 150. The second flange 820 has a second receiving groove 812, And a groove 822. The second receiving groove 822 is formed in a ring shape having a predetermined width and depth in the direction from the inner peripheral portion to the outer peripheral portion of the inner surface. That is, the second receiving groove 822 is formed with a second bottom surface 822a, which is a plane parallel to the inner surface, and a second inner circumferential surface 822b, which is parallel to the inner circumferential surface. The second receiving groove 822 may further include a second inclined surface 822c formed between the second bottom surface 822a and the second inner circumferential surface 822b. The second inclined surface 822c is inclined at an obtuse angle with the second bottom surface 822a and the first inner circumferential surface 822b.

The centering 830 is formed in a ring shape having a predetermined thickness and length and is disposed between the first bottom surface 812a of the first receiving groove 812 and the second bottom surface 822a of the second receiving groove 822 . The centering 830 is formed at a right angle or an acute angle with the outer circumferential surface and both sides to form a centering edge 831. [ In addition, the centering 830 has a centering groove 133 formed on the outer circumferential surface thereof. The centering 830 may include a first inclined surface 812c of the first flange 810 and a second inclined surface 822c of the second flange 820 when the first flange 810 and the second flange 820 are engaged, As shown in FIG. The first inclined face 812c of the first flange 810 and the second inclined face 822c of the second flange 820 when the first flange 810 and the second flange 820 are engaged, The length of the centering 830 is longer than the length of the centering edge 831 at which the centering edge 831 is in contact.

The centering edge 831 is formed at the center of the first inclined plane 812c of the first flange 810 and the second inclined plane 822c of the second flange 820 when the first flange 810 and the second flange 820 are fastened. Respectively. Thus, the centering 830 primarily seals between the first flange 810 and the second flange 820. The pipe connection device 800 does not generate friction due to vibration between the centering ring 830 and the protruding ring 840 and the first flange 810 and the second flange 820, It is possible to prevent hardening and corrosion of the insulating layer 150.

The centering ring 830 may be made of any one of metal materials such as aluminum, copper, nickel or alloys thereof, stainless steel, brass or the like, or a durable nonmetallic material such as Teflon, engineering plastic or reinforced plastic. Meanwhile, the centering 830 may be formed as a general centering ring used in a pipe connecting apparatus.

The centering groove 133 is formed in a ring shape along the outer circumferential surface of the centering ring 830 and includes a bottom surface between the inner side surface and the inner side surface facing each other. The centering groove 133 is inserted with the protruding ring 840 inserted therein.

The protruding ring 840 is formed in a ring shape having a predetermined length and thickness and is coupled to the centering groove 133 of the centering ring 830. Therefore, the protruding ring 840 is formed to have a length corresponding to the length of the centering groove 133. The protruding ring 840 is also preferably configured such that when both the first flange 810 and the second flange 820 are fastened, both sides face the inner side of the first flange 810 and the inner side of the second flange 820 Is formed to have a length larger than the distance between the side surfaces. The protruding ring 840 is pressed while being in contact with the inner surface of the first flange 810 and the inner surface of the second flange 820 when the first flange 810 and the second flange 820 are fastened. Thus, the protruding ring 840 secondarily seals between the first flange 810 and the second flange 820.

The protruding ring 840 has an O-ring groove 143 on which an O-ring 150 is seated. The O-ring groove 143 is formed in an arc shape corresponding to the outer circumferential surface of the O-

The protruding ring 840 may be made of a metal material such as aluminum, copper, nickel or alloys thereof, stainless steel, brass or the like, or a durable non-metallic material such as Teflon, engineering plastic or reinforced plastic.

The centering edge 831 of the pipe connection device 800 is pressed while being in contact with the first inclined face 812c of the first flange 810 and the second inclined face 822c of the second flange 120, It is possible to prevent friction from occurring with respect to the vibration generated in a direction perpendicular to the central axis of the rotor. The pipe connection device 800 may include a vertical gap formed between the outer circumferential surface of the centering ring 830 and the first inner circumferential surface 812b of the first flange 810 and the second inner circumferential surface 822b of the second flange 820, Can be effectively sealed even if there is a variation or positional difference.

Meanwhile, the centering ring 830 and the protruding ring 840 may be integrally formed. In this case, since the protruding ring 840 is fixed by the centering ring 830, friction due to vibration can be prevented.

Next, a piping connection apparatus according to another embodiment of the present invention will be described.

10 is a cross-sectional view of a piping connection apparatus according to another embodiment of the present invention.

10, a pipe connecting apparatus 900 according to an embodiment of the present invention includes a first flange 910, a second flange 920, a centering 830, a protruding ring 840, An O-ring 150, and a clamp 160. As shown in FIG. The piping connection apparatus 900 according to another embodiment of the present invention has a different structure from the piping connection apparatus 800 according to FIG. 9 and the first flange 910 and the second flange 920. Therefore, the piping connection device 900 according to another embodiment of the present invention is different from the respective configurations of the piping connection device 800 of FIG. 9 in the difference between the first flange 910 and the second flange 920 The following description will be given. The same or similar parts to those of the pipe connection device 800 of FIG. 9 are denoted by the same reference numerals, and detailed description thereof is omitted here.

The first flange 910 is formed in a ring shape and has a first receiving groove 912 at an inner peripheral portion of a plane inner surface. The first receiving groove 912 is formed in a ring shape having a predetermined width and depth in the direction from the inner peripheral portion to the outer peripheral portion of the inner surface. The first receiving groove 912 is inclined with respect to the inner circumferential surface of the first flange 910 and the first bottom surface 912a which is a plane parallel to the inner surface of the first flange 910. The first bottom surface 912a and the obtuse angle And a first inner circumferential surface 912b. That is, the first inner circumferential surface 912b is formed to be inclined with respect to the outer circumferential surface of the centering ring 830.

The second flange 920 is formed in a ring shape and has a second receiving groove 922 in an inner peripheral portion of a plane inner surface. The second receiving groove 922 is formed in a ring shape having a predetermined width and depth in the direction from the inner peripheral portion to the outer peripheral portion of the inner surface. The second receiving groove 922 has a second bottom surface 922a that is parallel to the inner surface of the second flange 920 and a second bottom surface 922b that is inclined to the inner circumferential surface of the second flange 920, And a second inner circumferential surface 922b having an obtuse angle. That is, the second inner circumferential surface 922b is formed obliquely with respect to the outer circumferential surface of the centering ring 830.

The pipe connecting device 900 is configured such that when the first flange 910 and the second flange 920 are fastened, the centering edge 831 is positioned between the first inner circumferential surface 912b of the first flange 910 and the second flange 920b 920, respectively. Thus, the centering 930 primarily seals between the first flange 910 and the second flange 920. The pipe connection device 900 does not generate friction due to vibration between the centering ring 830 and the protruding ring 840 and the first flange 910 and the second flange 920, 150 can be prevented from hardening and corrosion.

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 and scope of the invention. It is.

100, 100a, 200, 300, 400, 500, 600, 700, 800, 900:
110,810,910: First flange, 120,820,920: Second flange
130, 130a, 230, 330, 530, 830:
140, 140a, 440, 540, 640, 740, 840:
150: O-ring 160: Clamp

Claims (18)

A ring-shaped first flange having an outer surface connected to the first pipe and a first receiving groove formed in the inner peripheral portion to form a first edge with the inner surface,
A second ring-shaped flange having an outer surface connected to the second pipe, a second receiving groove facing the first receiving groove and forming an inner side surface and a second edge at an inner peripheral portion,
A centering body which is located between the first receiving groove and the second receiving groove and which is formed on the outer peripheral surface of the centering body and which has a ring shape and has a first corner and a second corner of the second receiving groove, A centering provided with a centering inclined portion to be contacted,
A ring-shaped protruding ring coupled to an outer circumferential surface of the centering ring,
And an O-ring seated on an outer circumferential surface of the projecting ring,
Wherein when the first flange and the second flange are engaged, the centering inclined portion of the centering is pressed in contact with the first edge and the second edge. The method according to claim 1,
Wherein the first receiving groove has a first bottom surface parallel to an inner surface of the first flange and a first inner circumferential surface parallel to an inner circumferential surface of the second flange, A second inner circumferential surface formed by the first inner circumferential surface,
Wherein the second receiving groove has a second bottom surface parallel to the inner surface of the second flange and a second inner circumferential surface parallel to the inner circumferential surface of the second flange, And a second inner circumferential surface of the pipe connecting device, The method according to claim 1,
Wherein the centering body further comprises a centering groove formed in a ring shape on the outer circumferential surface,
Wherein the centering inclined portion is formed to protrude from the outer circumferential surface of the centering body at both sides of the centering groove and is formed to have a triangular sectional shape cut in a direction parallel to the central axis of the centering. The method of claim 3,
The centering ramp
An inclined surface formed obliquely to the inner surface of the first flange and the second flange and press-fitted to the first and second edges,
And a vertical surface extending in an outward direction of the centering body, wherein the lower surface is in contact with the outer circumferential surface of the centering ring. The method of claim 3, wherein
The protruding ring
A ring-shaped protruding ring main body coupled to the centering groove;
And protrusions protruding from both side surfaces of the protruding ring body,
Wherein the projecting portion is formed such that both side surfaces thereof contact the inner surfaces of the first flange and the second flange when the first flange and the second flange are engaged. The method according to claim 1,
The centering body is formed to increase in length toward the outer circumferential surface,
Wherein when the first flange and the second flange are engaged, the outer circumferential portions of both side surfaces are formed to be pressed while being in contact with the first flange and the second flange. The method according to claim 6,
Wherein the centering body further comprises a V-shaped or U-shaped centering peripheral groove having a predetermined depth at both sides of the outer peripheral surface. 6. The method of claim 5,
Wherein the protruding portion of the protruding ring further includes at least one protruding groove formed in a V-shape or a U-shape at a predetermined depth on both sides. The method of claim 3,
The centering ramp
An inclined surface inclined to gradually decrease in height from the centering groove to both side surfaces of the centering body,
A lower surface that contacts the outer peripheral surface of the centering body between both side surfaces of the centering body and the centering groove,
And a vertical surface extending in an outward direction of the centering body. 10. The method of claim 9,
Wherein the centering body further comprises a centering side groove formed in a V-shape or a U-shape at a predetermined depth on both sides of the centering body. A ring-shaped first flange having an outer surface connected to the first pipe and a first receiving groove formed in the inner peripheral portion to form a first edge with the inner surface,
A second ring-shaped flange having an outer surface connected to the second pipe, a second receiving groove facing the first receiving groove and forming an inner side surface and a second edge at an inner peripheral portion,
A centering body which is located between the first receiving groove and the second receiving groove and which is formed on the outer peripheral surface of the centering body and which has a ring shape and has a first corner and a second corner of the second receiving groove, A ring-shaped centering ring provided with a centering ramp to be contacted, and
And a ring-shaped protruding ring coupled to an outer circumferential surface of the center ring and extending to an outer circumferential surface of the first flange and the second flange,
The protruding ring
A ring-shaped protruding ring body and
Further comprising protruding grooves protruding from both side surfaces of the protruding ring body and formed by V-shaped or U-shaped grooves having a predetermined depth at both sides thereof. 12. The method of claim 11,
The centering body is formed to increase in length toward the outer circumferential surface,
Wherein the centering body further comprises a V-shaped or U-shaped centering peripheral groove having a predetermined depth at both sides of the outer peripheral surface. The method according to claim 1,
Wherein the centering and the protruding ring are integrally formed. A ring-shaped first flange having an outer surface connected to the first pipe and a first receiving groove formed in the inner peripheral portion to form a first edge with the inner surface;
A second ring-shaped flange having an outer surface connected to the second pipe, a second receiving groove facing the first receiving groove and forming an inner side surface and a second edge at an inner peripheral portion,
A centering ring positioned between the first receiving groove and the second receiving groove and formed in a ring shape and having a centering edge formed by an outer circumferential surface and both side surfaces;
A ring-shaped protruding ring coupled to an outer circumferential surface of the centering ring,
And an O-ring seated on an outer circumferential surface of the projecting ring,
Wherein the first receiving groove of the first flange and the second receiving groove of the second flange include an inclined surface contacting the centering edge. 15. The method of claim 14,
The first receiving groove has a first bottom surface parallel to an inner surface of the first flange, a first inner surface parallel to an inner surface of the first flange, and a first inclined surface formed between the first bottom surface and the first inner surface. / RTI >
The second receiving groove has a second bottom surface parallel to an inner surface of the second flange, a second inner surface parallel to an inner circumferential surface of the second flange, and a second inclined surface formed between the second bottom surface and the second inner surface, / RTI >
Wherein when the first flange and the second flange are engaged, the first inclined surface and the second inclined surface are in contact with the centering edge and are compressed. 15. The method of claim 14,
Wherein the first receiving groove has a first bottom surface which is a plane parallel to an inner side surface of the first flange and a first inner circumferential surface which is inclined with an inner circumferential surface of the first flange and which forms an obtuse angle with the first bottom surface,
The second receiving groove has a second bottom surface which is a plane parallel to the inner side surface of the second flange and a second inner circumferential surface which is inclined to the inner circumferential surface of the second flange and which forms an obtuse angle with the second bottom surface,
Wherein when the first flange and the second flange are fastened, the first inner circumferential surface and the second inner circumferential surface are in contact with the centering edge and are compressed. A centering ring having a ring-shaped centering body and a centering inclined portion formed on an outer circumferential surface of the centering body and having an inclined surface to be pressed against an edge formed on an inner surface of the first flange and the second flange;
And a ring-shaped protruding ring coupled to an outer peripheral surface of the center ring. 18. The method of claim 17,
Wherein the centering and the protruding ring are integrally formed.

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