JP2700036B2 - Pipe fitting assembly method and assembly tool - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for assembling a pipe joint and a tool for assembling the same.
In particular, it is used in the semiconductor industry where perfect sealing is required.

[Prior Art] For example, in the semiconductor industry such as IC and LSI, work is performed in a clean room from which fine particles and the like are eliminated, and the environment and conditions of the manufacturing work are more severe. The special gas used in this manufacturing operation is introduced into the room from outside the clean room through a pipe. However, it is extremely disliked that other unnecessary gas molecules such as air are mixed into the special gas. For this reason, there is a demand for ultra-precision of pipe joints for connecting pipes as well as pipes. Also, in the case of a pipe joint such as a high-pressure gas container, complete sealing is required from the viewpoint of security and the like.

In a conventional pipe joint, in order to enhance the sealing performance, the tightening force between the two pipes that are uniquely connected, that is, the pressing force of the metal gasket interposed between the two pipes may be increased. However, if the pressing force, that is, the rotational force of the cap nut member for tightening the two pipes is increased, the pipes and the metal gasket are torsionally deformed, so that a tightening force of a certain value or more cannot be secured.

As a solution to this problem, the applicant has previously proposed a mechanism in which an axial force is transmitted between the inner surface of the cap nut member and one of the pipes, but a thrust bearing is interposed as a means for transmitting no rotational force. I have. That is, as shown in FIG. 4, one piece 10 and the other pipe 2 are hermetically attached to one pipe 1.
In a pipe joint in which a metal gasket 30 is interposed between the other piece 20 hermetically mounted on the pipe and the two pieces 10 and 20 are axially fastened with the cap nut member 5 to seally connect the two pipes 1 and 2, For example, a thrust bearing 8 is interposed between the inner surface 6 of the nut member 5 and the one piece 10 so that
There has been proposed a mechanism that can secure a tightening force of a certain value or more without causing torsional deformation of 0 (the one pipe 1 and the other pipe 2) and the metal gasket 30.

On the other hand, with respect to the relationship between the two pieces 10, 20 and the metal gasket 30 for improving the sealing property, the pressing surface 15 of the one piece 10 and the pressing surface 25 of the other piece 20 are mirror-finished from the viewpoint of smoothing the contact surface. And a metal gasket 30 with a C-shaped cross section
In addition, excellent crushing characteristics and residual elastic characteristics can be obtained, and the economy of reusing the metal gasket 30 is satisfied. The ultimate refinement of each component thus seeks for perfection of the seal. 5a is a screw on the other piece 20 side, and 20a is a screw on the cap nut member 5 side to be screwed with the screw. Reference numeral 21 denotes a nut for preventing twisting during assembly.

[Problems to be Solved by the Invention] However, in the above conventional pipe joint structure, no matter how sophisticated the components are, due to practical problems in handling, the functions cannot always be sufficiently exhibited, and perfect sealing is achieved. There is a problem that can not be.

That is, the connection mode shown in FIG. 4 is ideal, but in this mode, the other piece 20 is vertically shifted by 90 degrees from the illustrated state, and the metal gasket 30 is pressed against the pressing surface 25.
Is accurately positioned about the axis P on the surface of the surface, and one piece 10 is pressed in a vertical state, and then only when the two pieces 10, 20 can be tightened in the axial direction without twisting. Can be.

However, it is very difficult to achieve the connection in the above-mentioned manner in practical handling. That is, when the pipe 1 (2) is in a horizontal state or an inclined state, the metal gasket 30 is likely to fall onto the floor or the ground during the preparation. Once dropped, foreign substances such as dust adhere to the sealing surfaces (pressing surfaces 15 and 25) of the metal gasket 30 and become damaged, so that the desired sealing performance can no longer be expected. If the metal gasket 30 is pressed with a finger to prevent this, human oil and sweat adhere, and in this case, the sealing property is also impaired. For this reason, gasket 30
There is a demand for the development of technology that can achieve perfect sealing by interposing between the two pieces 10 and 20 without damaging the pieces.

Further, there is a strong demand to reduce the cost by simplifying the structure of the holding means for holding the metal gasket 30.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe joint assembling method and a tool for assembling the pipe joint, which can achieve perfect sealing with ease of handling, and which can increase flexibility while reducing costs.

[Means for Solving the Problems] The present invention focuses on the analysis of a large number of actual connection operations, and finds that solving a handling problem is extremely important for achieving a perfect seal. It is formed so that it can be interposed between both pieces without touching it.

That is, according to the first aspect of the present invention, there is provided a pipe in which a metal gasket is interposed between one piece and the other piece, and thereafter, the cap nut member is rotated to tighten the two pieces in the axial direction to seal and connect them. A method of assembling a joint, comprising applying a magnetic flux to one of the one piece and the other piece to have a magnetic force, and adsorbing a metal gasket to the pressing surface of the piece by using the magnetic force, and then applying the metal gasket. , The two pieces are butted together, and then the magnetic flux is removed.

According to a second aspect of the present invention, there is provided a pipe for sealingly connecting one piece and the other piece by axially tightening a metal gasket interposed between the two pieces by using the turning power of a cap nut member. In the joint, it is possible to generate a magnetic force capable of attracting and holding the metal gasket on the pressing surface of the piece, and remove the magnetic force after butting the two pieces. A magnetic force applying means formed as described above is provided.

[Operation] According to the first aspect of the invention, a magnetic flux is applied to one of the pieces in a state where the one piece and the other piece are separated from each other. Then, the piece has a magnetic force. Here, the metal gasket is sucked and held on the pressing surface of the piece. Therefore, the metal gasket does not fall to the ground or change position regardless of the posture of the piece. Here, the opposite piece is butted against the piece with the metal gasket interposed therebetween, and then the magnetic flux is removed. Thereby, the metal gasket is interposed between the two pieces. Then, by rotating the cap nut member, the two pieces can be connected quickly and easily with a perfect seal.

According to the second aspect of the invention, in a state where the one piece and the other piece are separated from each other, a magnetic force applying means is involved (attached or approached) to one of the pieces to generate a magnetic force. Then, the metal gasket is adsorbed on the pressing surface of the piece. Therefore, the metal gasket can be reliably held on the pressing surface regardless of the posture of the piece. Subsequently, the opposite piece is abutted on the metal gasket. Thereby, the metal gasket is interposed between the two pieces. Thereafter, the magnetic force applying means is removed and the magnetic force is removed from the piece.

Here, by turning the cap nut member, the two pieces can be easily and quickly connected in a perfect seal connection.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

(First Embodiment) This first embodiment is shown in FIG.

In FIG. 1, the pipe joint is roughly composed of one piece 10, the other piece 20, and a metal gasket 30, and is provided with a magnetic force applying means 40 forming an assembly tool.

One piece 10 is hermetically mounted on one pipe 1 and the other piece 20 is hermetically mounted on the other pipe 2. One piece 10
The pressing surface 15 protruding at the tip of the other and the pressing surface 25 provided at the bottom of the concave portion 24 of the other piece 20 correspond to each other,
Both are mirror-finished, and a metal gasket 30 is interposed between them. The other piece 20 is integrally provided with a nut portion 21 for the purpose of stabilizing the other piece 20 and preventing torsion when the cap nut member 5 is rotated. Therefore, insert the metal gasket 30 into the recess 24 and insert the two pieces 10, 20
Are rotated by rotating the cap nut member 25, and the two pieces 10, 20 (piping 1, 2) are tightened by the tightening force in the direction of the axis P.
The airtight seal can be connected.

The thrust bearing (8) and the like are the same as the conventional structure shown in FIG. In FIG. 1, the screw (20a) engraved on the other piece 20 is not shown.

Here, one of the pieces 10 (20) of the one piece 10 and the other piece 20 and the metal gasket 30 are formed of a magnetic material. In this embodiment, both the pieces 10 and 20 are made of stainless steel (SUS316), and the metal gasket 30 has a nickel C-ring structure.

The magnetic force applying means 40 applies a magnetic flux to one of the one piece 10 and the other piece 20 before rotating the cap nut member 5 to tighten the two pieces 10 and 20, thereby giving the piece a magnetic force. In addition, the magnetic flux is formed so that the magnetic flux can be removed after the metal gasket 30 is attracted to the pressing surface of the piece.

In this embodiment, a nut 21 provided integrally with the other piece 20 and a spanner 41 having a permanent magnet 42 are provided. In other words, if the pressing surface 25 (15) of any of the pieces 20 (10) has a magnetic force, the metal gasket 30 can be attracted, and the magnetic force can be released after the metal gasket 30 is attracted. Good.

Here, the magnetic force is removed after the adsorbed metal gasket 30 can no longer drop naturally. Therefore, the earliest time is when the two pieces 10 and 20 are butted with a certain pressing force across the adsorbed metal gasket 30. In this embodiment, it is selected that both caps 10, 20 (pipes 1, 2) are air-tightly sealed and connected by rotating the cap nut member 5. This is because the structure uses the spanner 41.

However, the present invention does not include making any of the pieces (particularly, the pressing surface) permanent magnet. That is, if the piece itself is made of a permanent magnet, magnetic dust or the like will be adsorbed to the site in the stages of production, transportation, assembly, and the like, and perfect sealing cannot be achieved. Further, there is a problem that an effective component or a mixed impurity in the gas flowing through the pipes 1 and 2 after assembling or during use adheres and accumulates, and thereafter, there is a problem such as peeling and falling.

Next, the method of assembling the pipe joint and the operation of the assembling tool will be described.

First, in a state where the two pieces 10 and 20 are separated from each other, magnetic flux is applied to the pressing surface 25 of the other piece 20 by the magnetic force applying means 40. That is, the permanent magnet portion 42 of the spanner 41 is connected to the nut portion.
By engaging with 21, the pressing surface is
25 has a certain magnetic force.

Next, the metal gasket 30 is attracted to the pressing surface 25 using magnetic force. At this stage, no matter how the posture of the other piece 20 is changed, the metal gasket 30 is stably held by the other piece 20 and does not fall naturally.

Under this condition, the pressing surface 15 of the one-piece 10 is pressed against the metal gasket. The pieces 10 and 20 are butted together with the metal gasket 30 interposed therebetween. Thereafter, the magnetic force applying means 40
May be released, but in this embodiment, since it is formed using the spanner 41, it still has a magnetic attraction force. Therefore, the one piece 10 can be once separated from the other piece 20 and rebutted for convenience of operation.

After that, the cap nut member 5 is rotated so that the two pieces 10, 2
Tighten 0 in the direction of the axis P. Thereby, the two pipes 1 and 2 are airtightly connected.

After the connection, the rotation stop operation of the wrench 41 becomes unnecessary, so the wrench 41 is removed from the other piece 20 (the nut portion 21). Thereby, the magnetic force of the pressing surface 25 is also released. Therefore, magnetic force does not remain in both pieces 10, 20 (pipes 1, 2) after assembly and during use.

Thus, according to this embodiment, the pressing surface 25 of the other piece 20 is given a magnetic force in addition to the magnetic flux, and the metal gasket 30 is attracted by utilizing this magnetic force, and after the two pieces 10 and 20 are abutted, the magnetic flux is generated. Since it is an assembling method for removing, regardless of the posture of the pipes 1 and 2, the assembling can be performed quickly and easily and an airtight seal connection can be made. Further, since the metal gasket 30 does not have to be pressed and obtained and does not fall naturally, there is no room for dust and oil to adhere to the metal gasket 30, and a more perfect seal connection is achieved.

Further, since the magnetic flux is removed after the metal gasket 30 is sandwiched and the two pieces 10 and 20 are butted together, impurities and the like do not adhere after assembling or during use. Gas and the like can be kept clean.

Further, since the magnetic force applying means 40 is formed by the spanner 41 provided with the permanent magnet portion 42 and the nut portion 21 of the other piece 20, the conventional operation of stopping the rotation of the cap nut member 5 is performed as it is. For example, a magnetic force can be naturally applied to the pressing surface 25, and the working efficiency can be increased. In addition, magnetic flux can be easily removed.

Further, since the two pieces 10 and 20 are generally formed of a metal which is a magnetic material, the cost is not increased due to exerting the magnetic force.

(Second embodiment) This embodiment is shown in FIG.

The magnetic force applying means 40 is formed of a soft iron yoke 43 for strengthening the magnetic action and a pair of permanent magnets 44 and 45 fixed to the inside of both ends, and is screwed with the screw 20a of the other piece 20 (the screw of the cap nut member 5). ) Are fitted from one side.

Therefore, a magnetic force can be applied to the pressing surface 25,
In addition to providing the same operation and effect as in the first embodiment, it is possible to apply a strong and efficient magnetic force to the pressing surface 25, and to remove the magnet immediately after the two pieces 10, 20 are sandwiched by the metal gasket 30 and butted. Can be made, both pieces 10,2
No minute dust or the like adheres to 0 or the like.

Third Embodiment As shown in FIG. 3, as in the case of the second embodiment, the magnetic force applying means 40 is formed, and the soft iron yoke 43 is enlarged to provide the locking portions 45, 45.

By engaging the locking portions 45, 45 with the nut portion 21 of the other piece 20, the entirety can be held by the other piece 20.

Therefore, the same operation and effect as those of the second embodiment can be obtained, and the assembling is further facilitated.

Further, in this embodiment, an attachment 50 indicated by a two-dot chain line in FIG. 3 is provided. One end of the attachment 50 is tapered, the large-diameter portion is slightly smaller than the inner diameter of the metal gasket 30, and the other end is made of plastic that can be inserted into the hole of the other piece 20. Therefore, the metal gasket 30 can be easily set at a predetermined position on the pressing surface 25 by inserting the metal gasket 30 from the wrapping paper into the attachment 50 while inserting and passing. In other words, a centripetal set can be made.

According to the first aspect of the present invention, a magnetic flux is applied to one of the pieces so as to have a magnetic force so that the metal gasket is attracted to the pressing surface of the piece, and the two pieces are butted with the metal gasket interposed therebetween. Since the magnetic flux is removed later to assemble, the metal gasket can be securely and easily set in any position of the pipe, and quick operation and perfect seal connection can be achieved.

Further, the invention according to claim 2 is provided with a magnetic force applying means capable of generating a magnetic force capable of adsorbing the metal gasket on the pressing surface of the piece in connection with one of the pieces and removing the magnetic force after the two pieces are joined. With this configuration, the metal gasket is obtained without any modification to the piece, and the metal gasket can be securely held on the pressing surface of the piece without pressing and clamping, so that quick work and perfect sealing can be achieved.

[Brief description of the drawings]

1 is an exploded perspective view showing a first embodiment of the present invention, FIG. 2 is an exploded perspective view of a main part showing a second embodiment, and FIG. 3 is a side sectional view of a main part showing a third embodiment. And FIG. 4 is a side sectional view of a conventional pipe joint. 1… one pipe, 2… other pipe, 5… Nut nut member, 10… one piece, 15… press surface, 20… other piece, 21… nut part, 25… press surface, 30 ... metal gasket, 40 ... magnetic force applying means, 41 ... spanner, 42 ... permanent magnet part, 43 ... yoke, 44, 45 ... permanent magnet.

Claims (2)

(57) [Claims] 1. A method of assembling a pipe joint in which a metal gasket is interposed between one piece and the other piece, and thereafter, the cap nut member is rotated to tighten the two pieces in the axial direction and seal-connect. Applying a magnetic flux to any one of the one piece and the other piece to give a magnetic force, and after adsorbing the metal gasket using the magnetic force on the pressing surface of the piece, butt the two pieces with the metal gasket in between, Thereafter, a magnetic flux is removed. 2. A pipe joint for sealingly connecting one piece and the other piece by axially tightening a metal gasket interposed between the two pieces by using the turning power of a cap nut member. A magnetic force applied to one of the other pieces that generates a magnetic force capable of attracting and holding the metal gasket on the pressing surface of the piece and that can remove the magnetic force after butting the two pieces. A fitting for assembling a pipe joint, characterized in that means for providing a pipe joint are provided.