JP4618117B2 - Piping connection method and pipe fitting - Google Patents

Description

  The present invention relates to a pipe connection method using a pipe joint, and a pipe joint.

Conventionally, as a pipe joint used to connect a pipe that circulates fluid inside a refrigerant pipe or the like of a refrigeration system, the pipe is connected to the joint body by placing the pipe at the joint of the joint body and screwing the nut into the joint body. There is known a pipe joint that is joined to a portion. As such a pipe joint, as shown in Patent Document 1, when a nut is screwed into the joint body, a sleeve is interposed between the joint body and the nut, and the sleeve is bitten into the outer periphery of the pipe by screwing the nut. A so-called bite joint is employed in which the joint body is joined to ensure the sealing performance of the joint.
Japanese Patent Laid-Open No. 2003-74768

  By the way, as for piping connected to such a pipe joint, as shown in FIG. 9, the longitudinal wound 101b may be formed in the outer periphery 101a of the piping 101 along the axial direction for the reason on manufacture. In addition, the outer periphery of the pipe may be damaged when the pipe is handled or transported. In this way, when a pipe with a scar formed on the outer periphery is to be connected using a bite fitting as described above, even if the nut is sufficiently screwed in and the sleeve is bitten into the pipe outer circumference, There is a possibility that a gap may be formed between the sleeve and the outer periphery of the pipe at the place where the is formed. If there is a gap between the sleeve and the outer periphery of the pipe when the pipe is connected, the sealing performance at the biting portion of the sleeve will deteriorate.

  The present invention has been made in view of such circumstances, and its purpose is to repair a scar formed on the outer periphery of the pipe and improve the sealing performance at the biting portion of the sleeve. And providing a pipe joint.

In the pipe connection method according to the present invention, a joint body in which a joint hole for joining pipes is formed on the inner periphery and a screw part is formed on the outer periphery, a nut screwed into the screw part, and the pipe a the method of connecting piping using a pipe joint comprising the threaded into the fitting body and the sleeve bites into the outer periphery of the pipe of said nut in a state of being inserted into the joint hole, the sleeve, the said nut Before being screwed into the joint body, the sleeve is integrally provided with the nut, and the sleeve is deformed so that the sleeve presses the outer periphery of the pipe by screwing the nut into the joint body. After the step and the first step, the nut is further screwed, and the sleeve is formed on the outer periphery of the pipe by rotating while pressing the outer periphery of the pipe. A second step of repairing a scar, a third step of further screwing the nut after the second step, cutting the sleeve from the nut, and a further screwing of the nut after the third step; And a fourth step of biting into the outer periphery of the repaired pipe.

  According to this configuration, the sleeve that bites into the outer periphery of the pipe by screwing the nut into the joint body is provided integrally with the nut before the nut is screwed into the joint body. For this reason, compared to the case where the sleeve is configured separately from the nut, it is possible to prevent the sleeve from being lost before the pipe is connected, and the sleeve is stored as a spare part. There is no need to keep it. Moreover, since it is not necessary to assemble a sleeve when connecting pipes, workability at the time of connecting pipes is improved.

  Also, when the nut is screwed into the joint body, the sleeve is deformed to press the outer periphery of the pipe, and then the nut is further screwed in so that the sleeve provided integrally with the nut rotates while pressing the outer periphery of the pipe. To repair the scar formed on the outer periphery of the pipe. Thus, since the sleeve rotates while pressing the outer periphery of the pipe, it is possible to suitably repair the scar formed on the outer periphery of the pipe using the screwing operation of the nut. And by screwing the nut further, the sleeve is cut from the nut and the sleeve is bitten into the outer periphery of the repaired pipe, so compared with the case where the sleeve is bitten in a state where the scar on the outer periphery of the pipe is not repaired The sealing performance at the biting portion of the sleeve can be improved when the pipe is connected.

In the fourth step, the pressing portion of the sleeve that presses the outer periphery of the pipe in the first step may bite into the outer periphery of the pipe.
According to this configuration, since the pressing portion of the sleeve that presses the outer periphery of the pipe in the first step bites into the outer periphery of the pipe in the fourth step, the pressing portion presses the outer periphery of the pipe and repairs the scar. And it can comprise so that it may bite into the same position of the outer periphery of piping as it is. For this reason, a press part can be reliably bited into the position where the scar of the outer periphery of piping was repaired, and the sealing performance in the press part which got into the outer periphery of piping can be improved.

  Further, in the first step, the guide surface formed on the joint main body contacts the sleeve to deform the sleeve so that the pressing portion presses the outer periphery of the pipe, and the fourth step The guide surface may guide the sleeve, and the pressing portion may bite into the outer periphery of the pipe.

  According to this configuration, the guide surface formed in the joint body deforms the sleeve so that the pressing portion presses the outer periphery of the pipe by contacting the sleeve in the first step, and the pressing portion in the fourth step. Guide the sleeve to bite into the outer circumference of the pipe. For this reason, the mode in which the pressing portion presses the outer periphery of the pipe and the mode in which the pressing portion bites into the outer periphery of the pipe can be set by one guide surface, so that the scar on the outer periphery of the pipe is repaired. On the other hand, it becomes easy to comprise so that a press part may bite in, and the sealing performance in the press part which bite into the outer periphery of piping can be improved.

Further, the pressing portion may be formed at a tip portion of the sleeve when the nut is screwed.
According to this configuration, since the pressing portion is formed at the tip of the sleeve when the nut is screwed, the pressing portion can be easily deformed by screwing the nut. For this reason, the sleeve is deformed before the sleeve is cut from the nut, and the pressing portion presses the outer periphery of the pipe to repair the scar.

In addition, the pipe joint according to the present invention includes a joint body in which a joint hole for joining pipes is formed on the inner periphery and a screw part is formed on the outer periphery, a nut that is screwed into the screw part, and the pipe includes A pipe joint provided with a sleeve that bites into an outer periphery of the pipe by screwing the nut into the joint body in a state of being inserted into the joint hole, the sleeve before the nut is screwed into the joint body , the are al provided integrally with the nut, at the time of screwing to the fitting body of the nut is disconnected from the nut after the sleeve is rotated and deformed so as to press the outer periphery of the pipe set breaking strength of the connecting portion of the front kina Tsu bets on so that the Rutotomoni, that is configured to receive the pressing force when the nut fastening bites into the outer periphery of the pipe after being cut And features.

According to this configuration, after the sleeve is deformed so that the sleeve presses the outer periphery of the pipe by screwing the nut into the joint body, the sleeve is connected to the nut so that the sleeve is cut from the nut by further screwing the nut. The cutting strength is set. For this reason, the sleeve provided integrally with the nut by the screwing operation of the nut rotates while pressing the outer periphery of the pipe to repair the scar formed on the outer periphery of the pipe, and then the sleeve is cut from the nut , The cut sleeve is configured to bite into the outer periphery of the pipe by the pressing force at the time of fastening the nut. As a result, since the sleeve cut from the nut bites into the outer periphery of the pipe with the damaged scar, the sleeve bites into the pipe when connecting it compared to when the sleeve is bitten without the scar on the outer circumference of the pipe being repaired. The sealing performance at the part can be improved.

  According to the pipe connection method and the pipe joint according to the present invention, the sleeve is provided integrally with the nut before the nut is screwed into the joint body, and the sleeve presses the outer periphery of the pipe as the nut is screwed. By configuring so as to rotate in such a state, the scar formed on the outer periphery of the pipe can be repaired. And since the sleeve cut | disconnected from the nut bites into the outer periphery of piping where the scar was repaired, the sealing performance in the biting part of a sleeve can be improved at the time of piping connection.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
FIG. 1 is a partial cross-sectional view showing a configuration of a pipe joint. The pipe joint 1 connects the pipes 11 and 12, a joint main body 13 into which the pipes 11 and 12 are inserted, a nut 14 screwed into the joint main body 13, and the joint main body 13 and the nut when the pipe is connected. 14 and a sleeve 15 interposed between them. The pipe 11 is fixed to the socket 13a provided at one end of the joint body 13 by brazing or the like, and the tip 12a of the pipe 12 joined to the joint body 13 is joined to the joint hole 13b provided at the other end. Has been inserted. The pipe 12 inserted into the joint main body 13 is joined to the joint main body 13 by the front end 15a of the sleeve 15 biting into the outer peripheral surface 12b of the pipe 12 by screwing the nut 14 into the joint main body 13.

  Here, the pipe joint 1 is configured such that the sleeve 15 is provided integrally with the nut 14 before the pipe 12 is connected. When the pipe 12 is connected, the front end portion (pressing portion) 15a of the sleeve 15 is pressed against the guide surface 13c formed on the joint main body 13 by screwing the nut 14 into the joint main body 13, and the front end portion 15a is deformed. By rotating in a state of pressing the outer peripheral surface 12b, the scar formed on the outer peripheral surface 12b of the pipe 12 is repaired. When the nut 14 is further screwed in, the sleeve 15 is cut from the nut 14 and the front end portion 15a bites into the outer peripheral surface 12b of the pipe 12. Hereinafter, the detail of the pipe joint 1 comprised in this way is demonstrated.

  FIG. 2 is a partial cross-sectional view of the joint body 13. The joint body 13 includes a socket portion 13a to which the pipe 11 is fixed, a joint hole 13b into which the pipe 12 is inserted, a guide surface 13c that guides the sleeve 15 when the sleeve 15 bites into the pipe 12, and a nut 14 that is screwed. It has a male screw part 13d to be joined and a nut part 13e formed on the outer periphery.

  The socket portion 13a is formed in a columnar shape and has an inner diameter that is substantially equal to the outer diameter of the pipe 11 to be fixed. The joint hole 13b is formed in a columnar shape, and has an inner diameter substantially equal to the outer diameter of the pipe 12 to be inserted. The socket portion 13a and the joint hole 13b communicate with each other through the internal space 13f. The guide surface 13c is located on the inlet side of the joint hole 13b and is formed in a conical shape. The conical surface guides the guided surface 15b formed on the sleeve 15 when the nut 14 is screwed, and the front end portion 15a of the sleeve 15 bites into the outer peripheral surface 12b of the pipe 12. The male screw portion 13d is formed on the outer peripheral side of the joint hole 13b and the internal space 13f in a screw shape to be screwed with the nut 14. The nut portion 13e is provided so that the joint body 13 can be held when the nut 14 is screwed.

  FIG. 3 is a partial cross-sectional view of the nut 14. The nut 14 includes a female screw portion 14 a that is screwed with the male screw portion 13 d of the joint body 13, a holding hole 14 b that holds the outer periphery of the pipe 12, and an inner surface 14 c that presses the sleeve 15 when the sleeve 15 bites into the pipe 12. And the sleeve 15 is integrally formed.

  The female screw portion 14 a is formed on the inner peripheral surface on the insertion side to be screwed into the joint main body 13. The holding hole 14b is formed in a columnar shape and has an inner diameter that is substantially equal to the outer diameter of the pipe 12 to be held. The inner side surface 14c is formed in a direction substantially perpendicular to the screwing direction of the nut 14 on the side portion on the female screw portion 14a side of the protrusion that forms the holding hole 14b.

  As shown in FIG. 3, the sleeve 15 is formed at a position on the inner diameter side opposite to the insertion side screwed into the joint main body 13 with respect to the female thread portion 14 a of the nut 14. The sleeve 15 is integrally formed with the nut 14 and is connected to the nut 14 through the base portion 15e. The sleeve 15 includes a front end portion 15a that bites into the outer peripheral surface 12b of the pipe 12, a guided surface 15b that is guided by the guide surface 13c when the sleeve 15 bites into the pipe 12, and an inner peripheral surface 15c that faces the pipe 12. And a rear end face 15d that receives a pressing force when biting into the pipe 12.

  The front end portion 15 a is formed at the distal end portion of the sleeve 15 when the nut 14 is screwed into the joint body 13. The guided surface 15b is provided on the outer peripheral side of the sleeve 15 and is formed in a conical shape. The inclination angle β of the conical surface in the guided surface 15 b is formed smaller than the inclination angle α of the conical surface in the guide surface 13 c of the joint body 13. Thus, when the nut 14 is screwed, the front end portion 15a adjacent to the guided surface 15b is deformed to the inner diameter side so as to bite into the outer peripheral surface 12b of the pipe 12. The inner peripheral surface 15 c is formed in a columnar shape and has an inner diameter that is substantially equal to the outer diameter of the pipe 12. The rear end surface 15 d is formed on the opposite side of the front end portion 15 a of the sleeve 15 and faces the inner side surface 14 c of the nut 14. The rear end surface 15 d receives a pressing force from the inner side surface 14 c after the sleeve 15 is separated from the nut 14, and bites the front end portion 15 a into the outer peripheral surface 12 b of the pipe 12.

  Further, the base portion 15e of the sleeve 15 is formed thin as shown in FIG. 3 so that the sleeve 15 can be easily cut and separated from the nut 14. Here, the base portion 15e of the sleeve 15 is deformed and rotated so that the front end portion 15a of the sleeve 15 presses the outer peripheral surface 12b of the pipe 12 when the nut 14 is screwed into the joint body 13. The cutting strength is set so as to be cut from. That is, before the sleeve 15 is cut from the nut 14, the front end 15 a is deformed and rotated so as to press the outer peripheral surface 12 b of the pipe 12, so that the scar formed on the outer peripheral surface 12 b of the pipe 12 can be repaired. It is configured.

  Next, with reference to FIGS. 4-8, the connection method of the piping 12 using the pipe joint 1 is demonstrated. 4, 5, 7, and 8 are cross-sectional views showing the state of the periphery of the sleeve 15 of the pipe joint 1. When connecting the pipe 12 to the pipe joint 1, first, the pipe 12 is passed through the holding hole 14 b of the nut 14, and the distal end portion 12 a of the pipe 12 is inserted into the joint hole 13 b of the joint body 13. Then, while holding the nut portion 13 e of the joint body 13, the female thread portion 14 a of the nut 14 is screwed into the male thread portion 13 d of the joint body 13. When the nut 14 is screwed in, the front end portion 15a of the sleeve 15 comes into contact with the guide surface 13c of the joint body 13 as shown in FIG.

  As the nut 14 is screwed in, the pressing force at the contact portion between the front end portion 15a of the sleeve 15 and the guide surface 13c of the joint body 13 increases. As a result, the sleeve 15 is deformed, the guided surface 15b is guided by the guide surface 13c of the joint body 13, and the front end portion 15a presses the outer peripheral surface 12b of the pipe 12 as shown in FIG. First step).

  When the nut 14 is continuously screwed in, the sleeve 15 provided integrally with the nut 14 rotates while pressing the outer peripheral surface 12 b of the pipe 12. As a result, the outer peripheral surface 12 b of the pipe 12 receives a pressing force from the front end portion 15 a of the sleeve 15. At this time, the portion of the front end portion 15a that presses the outer peripheral surface 12b has a certain width in the screwing direction and moves in the screwing direction, so that the scar 12c formed on the outer peripheral surface 12b is repaired (second step). . FIG. 6 is a perspective view showing a state where the scar 12c formed on the outer periphery of the pipe 12 is repaired. As shown in FIG. 6, the portion 12 d of the outer peripheral surface 12 b that receives the pressing force from the front end portion 15 a of the sleeve 15 is in a state in which the scar 12 c is repaired and there is no unevenness.

  When the nut 14 is further screwed in, the reaction force that the sleeve 15 receives from the portion 12d of the pipe 12 and the guide surface 13c of the joint body 13 increases. As a result, the shearing force applied in the screwing direction of the nut 14 is increased at the base portion 15e of the sleeve 15, and the base portion 15e of the sleeve 15 is cut (third step). Then, by cutting the base portion 15e of the sleeve 15, the nut 14 and the sleeve 15 are separated as shown in FIG.

  When the nut 14 is further screwed in, the inner surface 14c of the nut 14 comes into contact with the rear end surface 15d of the sleeve 15. As the nut 14 is screwed, the rear end surface 15d of the sleeve 15 receives a pressing force from the inner side surface 14c of the nut 14, and the guided surface 15b of the sleeve 15 is guided by the guide surface 13c of the joint body 13. As shown in FIG. 8, the front end portion 15a of the sleeve 15 bites into the portion 12d of the outer peripheral surface 12b of the pipe 12 (fourth step).

  Thus, the pipe joint 1 joins the pipe 12 to the joint main body 13 by causing the front end portion 15a of the sleeve 15 to bite into the outer peripheral surface 12b of the pipe 12. At this time, since the front end portion 15a of the sleeve 15 bites into the portion 12d of the pipe 12 where the scar 12c is repaired, a gap is generated between the front end portion 15a and the outer peripheral surface 12b of the pipe 12 when the pipe 12 is connected. Such a situation can be avoided, and the sealing performance at the biting portion of the front end portion 15a can be ensured. Further, since the guided surface 15b of the sleeve 15 and the guide surface 13c of the joint body 13 are in close contact with each other, the sealing performance between the guided surface 15b and the guide surface 13c can be ensured. As described above, the pipe 12 can be connected to the pipe joint 1 while ensuring the sealing performance.

According to the above embodiment, the following effects can be obtained.
(1) In the above embodiment, the sleeve 15 that bites into the outer peripheral surface 12 b of the pipe 12 is provided integrally with the nut 14 before the nut 14 is screwed into the joint body 13. For this reason, it is possible to prevent the sleeve 15 from being lost before the pipe 12 is connected, as compared with the case where the sleeve 15 is configured separately from the nut 14. There is no need to store them as parts. Further, since the sleeve 15 is provided integrally with the nut 14, there is no work for assembling the sleeve 15 when the pipe 12 is connected, and workability when the pipe 12 is connected is improved.

  (2) In the above embodiment, the sleeve 15 is deformed by screwing the nut 14 into the joint body 13 and the front end portion 15a presses the outer peripheral surface 12b of the pipe 12, and then the nut 14 is further screwed. The sleeve 15 provided integrally with the nut 14 rotates while pressing the outer peripheral surface 12b, and repairs the scar 12c formed on the outer peripheral surface 12b. Since the sleeve 15 rotates while pressing the outer peripheral surface 12b of the pipe 12 as described above, the scar 12c formed on the outer peripheral surface 12b of the pipe 12 is preferably repaired by using the screwing operation of the nut 14. Can do. Then, by further screwing the nut 14, the sleeve 15 is cut from the nut 14, and the front end portion 15 a of the sleeve 15 is bitten into the repaired portion 12 d of the pipe 12. For this reason, it is possible to avoid a situation in which a gap is generated between the front end portion 15a and the outer peripheral surface 12b of the pipe 12 when the pipe 12 is connected, and the scar 12c on the outer peripheral surface 12b of the pipe 12 is repaired. Compared with the case where the front end portion 15a is bitten in a state where there is not, the sealing performance at the biting portion of the front end portion 15a can be improved.

  (3) In the above embodiment, the front end 15a of the sleeve that presses the outer peripheral surface 12b of the pipe 12 and repairs the scar 12c is configured to bite into the portion 12d of the repaired pipe 12 and connect the pipe 12. ing. In this way, the front end portion 15a presses the outer peripheral surface 12b of the pipe 12 to repair the scar 12c of the part 12d, and bites into the part 12d as it is, so that the scar 12c is reliably against the repaired part 12d. The front end portion 15a can be bitten, and the sealing performance at the biting portion of the front end portion 15a can be improved.

  (4) In the above-described embodiment, the guide surface 13 c of the joint main body 13 contacts the guided surface 15 b of the sleeve 15, thereby deforming the sleeve 15 so that the front end portion 15 a presses the outer peripheral surface 12 b of the pipe 12. The sleeve 15 is guided so that the front end portion 15 a bites into the outer peripheral surface 12 b of the pipe 12. Therefore, it is possible to set a mode in which the front end portion 15a presses the outer peripheral surface 12b and a mode in which the front end portion 15a bites into the outer peripheral surface 12b by one guide surface 13c, so that the portion 12d where the scar 12c is repaired On the other hand, the front end portion 15a can be reliably bited in, and the sealing performance at the biting portion of the front end portion 15a can be improved.

  (5) In the above embodiment, the front end 15 a is formed at the tip of the sleeve 15 when the nut 14 is screwed into the joint body 13, so that the front end 15 a can be easily deformed by screwing the nut 14. . Therefore, the sleeve 15 is deformed before the sleeve 15 is cut from the nut 14, and the front end portion 15a presses the outer peripheral surface 12b of the pipe 12 to repair the scar 12c. .

  (6) In the above embodiment, the base portion 15e of the sleeve 15 is deformed and rotated so that the front end portion 15a of the sleeve 15 presses the outer peripheral surface 12b of the pipe 12 when the nut 14 is screwed into the joint body 13. The cutting strength is set so that the sleeve 15 is cut from the nut 14. For this reason, after the sleeve 15 rotates while pressing the outer peripheral surface 12 b of the pipe 12 by the screwing operation of the nut 14 to repair the scar 12 c formed on the outer peripheral surface 12 b of the pipe 12, the sleeve 15 is cut from the nut 14. Thus, the pipe joint 1 can be configured. And by comprising in this way, the sleeve 15 cut | disconnected from the nut 14 can be made to bite into the site | part 12d of the piping 12 by which the scar 12c was repaired. As a result, it is possible to avoid a situation in which a gap is generated between the front end portion 15a and the outer peripheral surface 12b of the pipe 12 when the pipe 12 is connected, and the scar 12c on the outer peripheral surface 12b of the pipe 12 is repaired. Compared with the case where the front end portion 15a is bitten in a state where there is not, the sealing performance at the biting portion of the front end portion 15a can be improved.

In addition, you may change the said embodiment as follows.
-In above-mentioned embodiment, although the pipe joint 1 was comprised so that the sleeve 15 might be integrally processed with respect to the nut 14, so that the sleeve 15 may be joined with respect to the nut 14 by methods, such as adhesion | attachment and a fitting. It may be configured.

  In the above embodiment, the scar 12c of the pipe 12 is repaired by the front end portion 15a of the sleeve 15, and the front end portion 15a is bitten into the repaired portion 12d. However, a portion other than the front end portion 15a, for example, the sleeve 15 The scar 12c may be repaired by a protrusion provided on the inner peripheral surface 15c, and the protrusion 12b may bite into the repaired portion 12d.

  In the above embodiment, the front end 15a of the sleeve 15 that presses the outer peripheral surface 12b of the pipe 12 and repairs the scar 12c of the pipe 12 bites into the outer peripheral surface 12b of the pipe 12, but the outer peripheral surface 12b The location of the sleeve 15 to be pressed and the location of the sleeve 15 that bites into the outer peripheral surface 12b may not be the same location.

  In the above embodiment, the pipe joint 1 is used to connect the pipes 11 and 12, but the configuration of the pipe joint 1 is connected to a refrigerant pipe that connects the indoor unit and the outdoor unit of the air conditioner. The present invention may be applied to a connecting portion of a shut-off valve as disposed in a refrigerant pipe of an air conditioner, or a connecting portion of a refrigerant pipe in another refrigeration apparatus.

The fragmentary sectional view which shows the structure of the pipe joint which concerns on this invention. The fragmentary sectional view of the joint main part concerning the present invention. The fragmentary sectional view of the nut concerning the present invention. Sectional drawing before a sleeve is cut | disconnected. Sectional drawing when a sleeve presses the outer periphery of piping. The perspective view which shows the state by which the scar formed on the outer periphery of piping was repaired. Sectional drawing after a sleeve is cut | disconnected. Sectional drawing when a sleeve bites into the outer periphery of piping. The perspective view which shows the state in which the scar was formed in the outer periphery of piping.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pipe joint, 11, 12 ... Pipe, 13 ... Joint main body, 14 ... Nut, 15 ... Sleeve.

Claims (5)

A joint body in which a joint hole for joining a pipe is formed on the inner periphery and a screw part is formed on the outer periphery, a nut that is screwed into the screw part, and the pipe is inserted into the joint hole A pipe connection method using a pipe joint provided with a sleeve that bites into the outer periphery of the pipe by screwing the nut into the joint body,
The sleeve is provided integrally with the nut before the nut is screwed into the joint body,
A first step of deforming the sleeve so that the sleeve presses the outer periphery of the pipe by screwing the nut into the joint body;
After the first step, the nut is further screwed, and the sleeve rotates while pressing the outer periphery of the pipe, thereby repairing the scar formed on the outer periphery of the pipe; and
After the second step, a third step of further screwing the nut and cutting the sleeve from the nut;
After the third step, the method further includes a fourth step of further screwing the nut and biting the sleeve into the outer periphery of the repaired pipe. In the piping connection method according to claim 1,
In the fourth step, the pressing portion of the sleeve that presses the outer periphery of the pipe in the first step bites into the outer periphery of the pipe. In the piping connection method according to claim 2,
In the first step, the guide surface formed on the joint main body contacts the sleeve to deform the sleeve so that the pressing portion presses the outer periphery of the pipe,
In the fourth step, the guide surface guides the sleeve so that the pressing portion bites into the outer periphery of the pipe. In the pipe connection method according to claim 2 or 3,
The method of connecting pipes, wherein the pressing portion is formed at a distal end portion of the sleeve when the nut is screwed. A joint body in which a joint hole for joining a pipe is formed on the inner periphery and a screw part is formed on the outer periphery, a nut that is screwed into the screw part, and the pipe is inserted into the joint hole A pipe joint comprising a sleeve that bites into the outer periphery of the pipe by screwing the nut into the joint body,
Said sleeve, before screwing on the fitting body of the nut is integrally provided, et al is to the nut, when screwed into the joint body of the nut, the sleeve an outer periphery of the pipe set breaking strength of the connecting portion of the front cinchona Tsu bets is to be disconnected from the nut deformed after rotation so as to press Rutotomoni, the receiving pushing force when the nut fastening after being cut A pipe joint configured to bite into the outer periphery of a pipe.

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