JP2013245695A - Pipe body coupling tool, method of coupling pipe body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe body coupling tool capable of being coupled to a pipe body in appropriate tightening torque simply, and a method of coupling the pipe body.SOLUTION: A pipe body coupling tool is provided with a body member 12 configured as a tubular shape, a thread portion for coupling which is formed on the body member 12 and with which a pipe body 46 is connected with a screw, a male thread portion 13B which is formed at outer periphery of the body member 12 and to which the same direction as the thread portion for coupling is adapted as a tightening direction and a retention member 16. The retention member 16 is configured as an annular shape and is formed with a flat surface for retention on the outer periphery and simultaneously is formed with a female thread portion 16A engaged with the male thread portion 13B so as to be threaded at the inner periphery and is tightened to the male thread portion 13B so that the tightening of the female thread portion 16A with the male thread portion 13B is disengaged if tightening torque between the thread portion for coupling and the pipe body 46 exceeds predetermined management torque.

Description

  The present invention relates to a tube connecting device and a tube connecting method, and more particularly, to a tube connecting device connected to a tube by screwing and a tube connecting method of the tube connecting device.

  Conventionally, a pipe joint for connecting pipe bodies by screwing is known. For example, as disclosed in Patent Document 1, a male screw is formed on the outer periphery of a pipe joint to be connected to a pipe body having a female screw formed, or a female screw is formed on the inner circumference of a pipe joint to form a male screw. It is done to connect with the body.

  In such a pipe joint, it is necessary to ensure a tightness between the connected pipe body and the pipe joint. For this purpose, considering the degree of crushing of the sealing material, an appropriate fastening is required at the time of connection. It is important to fasten with torque. However, it is difficult to fasten with an appropriate fastening torque at the work site where the connecting work is performed.

JP 2010-230033 A

  The present invention has been made in view of the above problems, and provides a tube connecting tool and a tube connecting method capable of easily preventing connection with a tube exceeding an appropriate fastening torque. The purpose is to do.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a tube-shaped main body member, and a connecting screw formed on the main body member and connected to the tube body by screwing. And a male screw part formed on the outer periphery of the main body member and having the same direction as the coupling screw part as a fastening direction, and an annular shape, and a holding part for holding the tool with a tool is formed on the outer periphery. A female screw portion that is screwed with the male screw portion is formed around the circumference, and receives a fastening torque when the tube body and the connecting screw portion are connected to each other. And a holding member fastened to the male screw portion so that the fastening of the male screw portion and the female screw portion is released when the fastening torque exceeds a predetermined management torque.

  In the tube connector according to claim 1, a male screw part is formed on the outer periphery of the cylindrical main body member, and a female screw part formed on the inner periphery of the holding member is screwed to the male screw part. Yes. The main body member is formed with a connecting screw portion for connecting the tubular bodies. The connecting screw portion may be a male screw or a female screw.

  Here, since the fastening direction of the male screw portion on the outer periphery of the main body member and the fastening direction of the connecting screw portion are the same direction, the holding member is held with a tool so that the connecting screw portion and the tube are fastened. When a torque is applied to the tube, a torque in a direction in which mutual fastening is released is applied between the female screw portion and the male screw portion in response to a fastening torque when the pipe body is connected to the connecting screw portion. . Therefore, when the fastening torque between the connecting screw part and the pipe body exceeds a predetermined management torque, the female screw part and the male screw part are fastened so that the fastening between the male screw part and the female screw part is released. Keep it.

  With the above configuration, when the tube body is connected to the connecting screw portion, when a torque exceeding a predetermined management torque is applied, the fastening between the male screw portion and the female screw portion is released. Thereby, it can prevent that the torque exceeding management torque is input between a tubular body and a main body member, and can connect a tubular body and the connection tool for tubular bodies with an appropriate fastening torque.

  The invention relating to the tube connector according to claim 2 is characterized in that at least a part of the main body member is formed of a resin material.

  When at least a part of the main body member is formed of a resin material, damage to the resin part or interface with other materials (metals) due to excessive fastening torque when fastening to the tube Peeling can be prevented.

  According to a third aspect of the present invention, the male threaded portion and the female threaded portion have a tapered thread shape.

  Thus, by making the male screw portion and the female screw portion into a tapered screw shape, the setting of the management torque obtained by fastening both can be made wider than in the case of the parallel screw shape.

  The invention according to claim 4 is characterized in that the connecting screw portion has a tapered screw shape.

  As described above, when the connecting thread portion is formed in a taper screw shape, the fluctuation width of the fastening torque becomes large. However, by applying the present invention, the tube body and the main body member can be easily connected with an appropriate fastening torque. Can be linked.

  According to a fifth aspect of the present invention, there is provided a tubular body connecting method, wherein the holding member of the tubular body connector according to any one of the first to fourth aspects is held, and the threaded portion of the tubular body and the connecting threaded portion are screwed together. Thus, a fastening torque is applied between the connecting screw portion and the tubular body.

  In the invention according to the pipe connecting method according to claim 5, when torque is applied so as to hold the holding member and fasten the connecting screw part and the pipe, the female screw part of the holding member and the male screw part of the main body member Torque is applied in the direction in which the mutual fastening is released. When the torque for fastening is increased and exceeds the management torque, the fastening between the female screw portion of the holding member and the male screw portion of the main body member is released. Therefore, it is possible to prevent a torque exceeding the management torque from being input between the tube body and the main body member, and the tube body and the tube connector can be connected with an appropriate fastening torque.

  According to a sixth aspect of the present invention, there is provided a tubular body connecting method in which a cylindrical main body member and an annular holding member are screw-fastened in a first direction so as to be released from each other when a predetermined management torque is exceeded. The main body member and the tubular tube are screw-fastened in the first direction while applying a torque in the direction opposite to the first direction to the holding member, and the fastening between the main body member and the holding member is released. In this case, it is determined that the fastening torque between the main body member and the tubular body has exceeded the management torque.

  In the tubular body connecting method according to the sixth aspect, the main body member and the tubular tubular body are screw-fastened in the first direction while applying a torque in the direction opposite to the first direction to the holding member. And when management torque acts between a main body member and a holding member and mutual fastening is cancelled | released, it is judged that the fastening torque between a main body member and a tubular body exceeded management torque. According to the present invention, it is possible to easily prevent the fastening exceeding the management torque by judging as described above.

  The tube connector according to claim 7 is a tube connector used in the tube connecting method according to claim 6, and is formed into a cylindrical shape, and an external thread is formed on the outer periphery, and the tube is A main body member having a connecting screw portion formed in the same direction as the male screw portion connected by screwing; and a holding member screwed to the male screw portion of the main body member.

  According to the tubular body connector of the seventh aspect, the tubular body coupling method of the sixth aspect can be implemented using the main body member and the holding member.

  According to the tubular body connector, the tubular body coupling method, and the tubular body coupling determination method according to the present invention, when the tubular body is coupled to the coupling thread portion, the management torque is applied between the tubular body and the main body member. It is possible to prevent the torque exceeding the input.

It is a half cut sectional view of the pipe joint concerning a 1st embodiment of the present invention. It is a disassembled perspective view of the main body member and holding member of the pipe joint which concern on 1st Embodiment of this invention. It is a perspective view of the main body member and holding member of a pipe joint concerning a 1st embodiment of the present invention. It is a half cut sectional view of the pipe joint which concerns on the modification of 1st Embodiment of this invention. It is a half cut sectional view of a pipe joint concerning other modifications of a 1st embodiment of the present invention, (A) shows a state unconnected with a pipe, and (B) shows a state connected with a pipe. is there. It is a perspective view which shows the modification of the holding member of the pipe joint of 1st Embodiment of this invention. It is a half section view of the pipe joint concerning a 2nd embodiment of the present invention. It is a half cut sectional view of the pipe joint which concerns on the modification of 2nd Embodiment of this invention. It is a half cut sectional view of a pipe joint concerning other modifications of a 2nd embodiment of the present invention.

[First Embodiment]
A first embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a half cutaway view of a pipe joint 10 as a pipe connector according to an embodiment of the present invention.

  The pipe joint 10 includes a tubular main body member 12, a tubular intermediate portion 14, a holding member 16, and a tubular sleeve 18. The intermediate portion 14 is disposed on the outer periphery of the one end portion 12 </ b> C of the main body member 12, and the sleeve 18 is disposed on the outer periphery of the intermediate portion 14. An insertion hole 20 into which the pipe 40 is inserted is formed between the intermediate portion 14 and the sleeve 18 and the main body member 12.

  An annular lock ring 30 for holding the pipe 40 in the insertion hole 20 is disposed inside the sleeve 18. The lock ring 30 has a substantially V shape with a section rotated 90 degrees, and a claw portion 30A is formed on the inner periphery. As the claw portion 30A bites into the outer periphery of the pipe 40, the pipe 40 is prevented from coming off.

  On the inner wall of the sleeve 18, a tapered surface 18 </ b> A is formed on which the substantially V-shaped outer surface of the lock ring 30 can abut. The tapered surface 18A is formed so as to reduce in diameter toward the inlet 20A side of the insertion hole 20.

  A release ring 22 that is movable along the axial direction S of the pipe joint 10 is inserted on the inner peripheral side of the sleeve 18 closer to the inlet 20 </ b> A of the insertion hole 20 than the lock ring 30. The release ring 22 has a substantially cylindrical shape, and the inner peripheral wall forms a part of the insertion hole 20. A protrusion 22A is formed on the outer periphery of the release ring 22 in the circumferential direction, and coming out of the sleeve 18 is prevented by contacting the small diameter portion 18B formed on the inner periphery of the sleeve 18. The tip 22 </ b> B of the protrusion 22 </ b> A has a tapered shape and is disposed along the radially outer peripheral surface of the lock ring 30.

  Two circumferential grooves 12A are formed on the outer circumferential surface facing the insertion hole 20 in the main body member 12, and rubber O-rings 24 are fitted into these circumferential grooves 12A, respectively. A wall surface 13 </ b> D having an enlarged outer diameter is formed in the innermost portion of the insertion hole 20 on the back side of the circumferential groove 12 </ b> A of the main body member 12. The tip of the pipe 40 comes into contact with the wall surface 13D. The wall surface 13 </ b> D serves as a stopper for the pipe 40.

  As shown in FIG. 2, the outer diameter of the other end portion 12 </ b> D opposite to the insertion hole 20 of the main body member 12 is larger than the one end portion 12 </ b> C and the intermediate cylinder 14. A female screw portion 13A is formed on the inner periphery of the other end portion 12D. The female thread portion 13A is a right-hand thread. Moreover, the external thread part 13B is formed in the outer periphery of other end part 12D. The male thread portion 13B is also a right-hand thread. The female screw portion 13A and the male screw portion 13B have a tapered screw shape.

  A holding member 16 is attached to the male screw portion 13B. The holding member 16 is annular, and an internal thread 16A is formed on the inner periphery. The female screw 16A is screwed into the male screw portion 13B. A flat surface 16 </ b> C is formed on the outer periphery of the holding member 16 as a holding portion for holding with a tool. A plurality of pairs of flat surfaces 16C are formed so as to be paired at positions facing each other across the central axis of the holding member 16, and have a shape that is easy to hold when connected to the tubular body 46 described later. The holding member 16 rotates relative to the main body member 12 when a preset management torque T1 is applied in the direction opposite to the fastening direction (the direction in which the fastening between the male screw portion 13B and the female screw 16A is loosened). The main body member 12 is fastened so that the fastening is released.

  The other end 12 </ b> D of the main body member 12 is connected to the tube body 46. The tube body 46 is tubular, and a flow path is formed inside the tube. On the outer periphery of one end side of the tube body 46, a male screw portion 46B is formed. The male screw portion 46B is screwed with the female screw portion 13A. A seal tape 48 is wound around the outer periphery of the male screw portion 46B.

  The main body member 12 and the pipe body 46 are connected by fastening the female screw portion 13A and the male screw portion 46B with the fastening torque T2. The fastening torque T2 is an upper limit value of a fastening torque range (hereinafter referred to as “appropriate fastening torque range”) when the male screw portion 46B of the tube body 46 and the female screw portion 13A of the other end portion 12D are fastened while being properly sealed. Is set as The fastening torque range is determined in advance in consideration of the degree of crushing of the seal tape 48 and water stoppage. For example, in the case of a taper screw of size Rc1 / 2, the maximum fastening torque required for fixing the pipe is about 50 N · m. In the case of a size G1 / 2 parallel screw, the fastening torque required for fixing the pipe is about 25 N · m at maximum. The aforementioned management torque T1 is set based on the fastening torque T2. The other end side (not shown) of the tube body 46 is fixed to a structure or the like.

  In this embodiment, the main body member 12, the intermediate portion 14, the holding member 16, the sleeve 18, and the release ring 22 are made of resin, and the lock ring 30 is made of stainless steel. The pipe 40 is made of resin. As the resin, a thermoplastic resin that satisfies heat resistance performance, water resistance performance, and leaching performance, such as PPS (polyphenylene sulfide), PB (polybutene), PPSU (polyphenylsulfone), and PES (polyethersulfone) is preferably used. be able to.

Each member of the pipe joint 10 is not limited to these materials, and other materials may be used. For example, the main body member 12 can be made of metal, the intermediate portion 14, the holding member 16, the sleeve 18 and the release ring 22 can be made of resin, and the lock ring 30 can be made of stainless steel. The holding member 16 may also be made of metal. Furthermore, the thing of the structure which embedded the cylindrical metal so that only the part which forms the internal thread part 13A of the main-body member 12 may be employ | adopted is also employable. Also, the pipe 40 may be made of rubber or other relatively soft member into which the claw portion 30A of the lock ring 30 can bite.

  Further, since the fastening torque between the male screw portion 13B and the female screw 16A is loosened with time, it is fastened with a torque higher than the management torque T1 when the product is assembled. When the main body member 12 and the pipe body 46 are made of resin, the fastening torque decreases to about 70% with the passage of time from the time of fastening, so the fastening torque is about 1.4 times the management torque T1. It is preferable to keep it. In the case of the taper screw having the size Rc1 / 2 described above, the fastening torque is about 50 N · m at the maximum, so it is preferable to fasten at about 71 N · m. Further, in the case of a size G1 / 2 parallel screw, the fastening torque required for fixing the pipe is about 25 N · m at the maximum, so it is preferable to fasten at 36 N · m.

  Next, the operation of the pipe joint 10 will be described.

  When connecting the pipe joint 10 to the pipe body 46, the internal thread part 13 </ b> A of the main body member 12 of the pipe joint 10 and the external thread part 46 </ b> B of the pipe body 46 are screwed together and fastened. At this time, the holding member 16 of the pipe joint 10 is held by a fastening tool (not shown) such as a wrench, and the male screw portion 46B and the female screw portion 13A around which the seal tape 48 is wound are fastened (first direction). Direction). Then, fastening is performed within an appropriate fastening torque range smaller than the fastening torque T2.

At this time, a rotational torque in the direction opposite to the fastening direction is applied between the holding member 16 and the main body member 12 in response to the fastening torque when the tube body 46 and the male screw portion 46B are connected. In the unlikely event that the rotational torque by the fastening tool exceeds the management torque T1, the holding member 16 and the other end portion 12D of the main body member 12 are relatively rotated, and the fastening of the holding member 16 is released. On the other hand, the male threaded portion 46B of the tube body 46 and the female threaded portion 13A of the other end 12D are fastened with a fastening torque T2.

  According to the present embodiment, when the management torque T1 is exceeded, the holding member 16 is loosened so that a torque larger than the management torque T1 does not act on the main body member 12, and the main body member 12 is damaged by an excessive fastening force or the seal tape 48 is damaged. Damage can be prevented. When the fastening of the holding member 16 is released, it can be determined that the management torque T <b> 1 has been input to the main body portion 12, the pipe body 46, and the holding member 16.

  In the present embodiment, the fastening torque T2 is set as the upper limit value of the range of the appropriate fastening torque, but other values can be set as the fastening torque T2. For example, an upper limit value for preventing damage to the male screw portion 46B and the female screw portion 13A above the range of the proper fastening torque, or an intermediate value in the range of the proper fastening torque may be set.

  In this embodiment, no rotational torque is applied between the male screw portion 46B and the female screw portion 13A until the holding member 16 is loosened, but between the male screw portion 46B and the female screw portion 13A. Rotational torque may be applied until the screw becomes loose. In this case, if the management torque T1 is set within an appropriate fastening torque range, a rotational torque is applied until the holding member 16 is loosened, so that the female screw portion 13A of the pipe joint 10 and the male screw of the pipe body 46 can be easily obtained. The portion 46B can be fastened with the management torque T1. In particular, in a pipe joint having a threaded portion made of a resin, the necessity of management of fastening torque is high, and therefore the present invention can be effectively applied.

  In this embodiment, the female screw portion 16A of the holding member 16 and the male screw portion 13B of the other end 12D are tapered, but as shown in FIG. 4, a parallel screw-shaped female screw portion 16AP and a male screw portion 13BP are formed. May be. By using a tapered screw shape as in this embodiment, the fastening torque between the holding member 16 and the main body member 12 can be widened, and the degree of freedom in setting the fastening torque T2 and the management torque T1 can be increased. it can.

  Further, in the present embodiment, the female screw portion 13A of the other end portion 12D and the male screw portion 46B of the tube body 46 are tapered, but as shown in FIG. 5, these are also parallel screw-shaped female screw portions 13AP and male screws. The part 46BP may be used. In this case, instead of the seal tape 48, as shown in FIG. 5B, a seal ring 49 is inserted at the tip of the tube body 46 to perform sealing. By using a tapered screw shape as in the present embodiment, higher sealing performance can be ensured.

  Further, since the main body member 12, the intermediate portion 14, the holding member 16, the sleeve 18 and the release ring 22 are made of resin, the weight of the pipe joint can be reduced and the manufacturing cost can be reduced.

  In the present embodiment, the holding portion in the tool is the flat surface 16C. However, as shown in FIG. 6, the outer periphery of the holding member 16 is arcuate and a hole 16H for holding in the tool is provided. Good.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the pipe joint 50 of the present embodiment connects a pipe body 52 having an internal thread portion 52 </ b> A instead of the pipe body 46. In the pipe joint 50, the internal thread portion 13A is not formed on the inner periphery of the other end portion 12D of the main body member 12, and the internal thread of the tube body 52 is formed on the outer periphery of the tip end portion (the end portion on the opposite side to the one end portion 12C) of the other end portion 12D. A connecting male screw portion 15B for screwing the portion 52A is formed. A seal tape 48 is wound around the connecting male screw portion 15B. The male screw portion 13B is formed on the one end portion 12C side of the other end portion 12D, and the holding member 16 is fastened to the male screw portion 13B with a management torque T1. The female screw portion 52A and the connecting male screw portion 15B have a tapered screw shape. The outer diameter of the male screw portion 13B is set larger than the outer diameter of the connecting male screw portion 15B.

Next, the operation of the pipe joint 10 will be described.
When the pipe joint 50 is connected to the pipe body 52, the connection male thread portion 15B of the main body member 12 of the pipe joint 50 and the female thread section 52B of the pipe body 52 are screwed together and fastened. At this time, the holding member 16 of the pipe joint 50 is held by a fastening tool (not shown) such as a wrench, and the connecting male screw portion 15B and the female screw portion 52A around which the seal tape 48 is wound are tightened. Rotate. Then, fastening is performed within an appropriate fastening torque range smaller than the fastening torque T2.

At this time, rotational torque in the direction opposite to the fastening direction acts between the holding member 16 and the main body member 12. If the rotational torque exceeds the management torque T1, the holding member 16 and the main body member 12 are relatively rotated, and the fastening of the holding member 16 is released. On the other hand, the female threaded portion 52A of the tubular body 52 and the connecting male threaded portion 15B of the other end 12D are fastened with a fastening torque T2.

  According to the present embodiment, according to the present embodiment, when the management torque T1 is exceeded, the holding member 16 is loosened so that a torque larger than the management torque T1 does not act on the main body member 12, and the main body member 12 due to an excessive fastening force. And damage to the sealing tape 48 can be prevented.

  In the present embodiment, various fastening torques T2 can be set as in the first embodiment. Also in this embodiment, the fastening with the fastening torque T2 may be performed by applying a rotational torque between the main body member 12 and the tube body 52 until the holding member 16 is loosened.

  Also in this embodiment, the female screw portion 16A of the holding member 16 and the male screw portion 13B of the other end portion 12D are tapered screw shapes, but may be parallel screw shapes as shown in FIG. By using a tapered screw shape as in this embodiment, the fastening torque between the holding member 16 and the main body member 12 can be widened, and the degree of freedom in setting the fastening torque T2 and the management torque T1 can be increased. it can.

  Also in this embodiment, the connecting male screw portion 15B of the other end portion 12D and the female screw portion 52A of the tube body 52 are formed in a tapered screw shape. However, as shown in FIG. In this case, instead of the seal tape 48, sealing is performed by inserting a seal ring 49 at the tip of the other end portion 12D. By using a tapered screw shape as in the present embodiment, higher sealing performance can be ensured.

  The present invention is also applicable to pipe joints other than those shown in the first and second embodiments. Moreover, it can apply also to what is connected with pipe bodies, such as a water stop cock, other than a pipe joint.

10 Pipe Fitting 12 Body Member 13A Female Thread Part (Connection Thread Part)
13AP female thread (connection thread)
13B Male Thread Part 13BP Male Thread Part 15B Male Thread Part 15B Connection Male Thread Part (Connection Thread Part)
16A Female thread part 16AP Female thread part 16C Flat surface (holding part)
16 Holding member 46 Tube 50 Pipe joint 52 Tube T1 Management torque

Claims (7)

A cylindrical body member;
A connecting thread portion formed on the main body member and connected to the tube body by screwing;
A male screw part formed on the outer periphery of the main body member, the same direction as the connecting screw part being the fastening direction;
A holding portion for holding with a tool is formed on the outer periphery and a female screw portion to be screwed with the male screw portion is formed on the inner periphery, and the tube body and the connecting screw portion are connected to each other. When the fastening torque between the connecting screw portion and the pipe body exceeds a predetermined management torque, the fastening between the male screw portion and the female screw portion is released when the fastening torque is received. A holding member fastened to the male screw part;
A tube connector comprising   The tube connector according to claim 1, wherein at least a part of the main body member is formed of a resin material.   The tube connector according to claim 1, wherein the male screw portion and the female screw portion are tapered screw shapes.   The tube connector according to any one of claims 1 to 3, wherein the connecting screw portion has a tapered screw shape.   The holding member of the tubular body connector according to any one of claims 1 to 4, wherein the threaded portion of the tubular body and the threaded portion for coupling are screwed together to connect the threaded portion for coupling and the tubular body. A tube connecting method in which a fastening torque is applied between the two. The cylindrical body member and the annular holding member are screw-fastened in the first direction so that the mutual fastening is released when a predetermined management torque is exceeded,
Screwing the body member and the tubular tube in the first direction while applying a torque in the direction opposite to the first direction to the holding member;
A tube connecting method in which when the fastening between the body member and the holding member is released, it is determined that the fastening torque between the body member and the tube exceeds the management torque. A tube connector used in the tube connector method according to claim 6,
A body member having a cylindrical shape, a male screw portion formed on the outer periphery, and a connecting screw portion formed in the same direction as the male screw portion to which the tubular body is connected by screwing,
A holding member screwed to the male thread portion of the body member;
A tube connector comprising

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