JP5865600B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint for connecting a fluid pipe.

  Conventionally, as a pipe joint between pipes for transferring a liquid such as beer, for example, a pipe joint that can prevent a hose coupled to a joint body from being inadvertently detached due to an external force as in Patent Document 1 is known. ing.

JP 2007-1113737 A

  However, in the pipe joint as in Patent Document 1, when the hose is a resin pipe, a gap is formed in the joint surface between the joint body and the hose due to a change over time in the use process, and liquid enters the gap and collects liquid. May lead to

  In view of the above facts, an object of the present invention is to obtain a pipe joint capable of suppressing liquid accumulation on the joint surface between the joint body and the hose.

A pipe joint according to a first aspect of the present invention includes a joint body including a flow path through which a fluid flows, a hose holding section formed at an end of the flow path to hold a hose, and an inner portion of the hose holding section. An annular seal member that is provided on a peripheral surface of the hose facing the end surface of the hose and that faces the flow path; and an inner peripheral portion of the hose holding portion, and a large-diameter portion is provided on the end surface of the hose and the seal member provided between a metallic inner cylinder small-diameter portion is inserted into the inner periphery of the hose, provided on the outer peripheral side of the small diameter portion of the inner cylinder, the inner cylinder while holding the hose The hose holding means that contacts the large diameter portion and the outer peripheral portion of the hose holding portion are screwed and screwed to hold the large diameter portion of the inner cylinder pressed against the seal member via the hose holding means. And a holding member.
The pipe joint according to the second aspect of the present invention includes a flow path through which a fluid flows, a large diameter formed at an end of the flow path and holding a hose and having an inner peripheral portion larger in diameter than the flow path. An annular seal member that is provided on a surface facing a joint body provided with a hose holding portion including a diameter portion and an end surface of the hose at a large diameter portion of the hose holding portion and faces the flow path A large-diameter portion of the hose holding portion, the large-diameter portion is provided between the end surface of the hose and the seal member, and the small-diameter portion is inserted into the inner peripheral portion of the hose. A hose holding means that is provided on the outer peripheral side of the small diameter portion of the inner cylinder in the large diameter portion of the hose holding portion, holds the hose and contacts the large diameter portion of the inner cylinder, and the hose holding portion Screwed in and screwed into the outer periphery of the front through the hose holding means The large diameter portion of the inner cylinder having a holding member for holding in a state of being pressed to the seal member.

In the pipe joint according to the first aspect of the present invention and the pipe joint according to the second aspect of the present invention , the holding member is screwed into the outer peripheral portion of the hose holding portion of the joint main body so that the holding member is inserted through the hose holding means. The large diameter part of the cylinder is held in a state of being pressed against the seal member. As a result, the seal member is in close contact with both the surface facing the end surface of the hose in the inner peripheral portion of the hose holding portion of the joint body and the large diameter portion of the inner cylinder, and the hose is attached to the outer peripheral portion of the small diameter portion of the inner cylinder. The end face of is arranged. For this reason, it can suppress that a clearance gap is made in the joint surface of a joint main body and a hose by a time-dependent change. As a result, liquid can be prevented from entering the gap and becoming a liquid pool.

According to a third aspect of the present invention, in the pipe joint according to the first or second aspect , the small-diameter portion of the inner cylinder has a claw portion that engages with the inner peripheral portion of the hose.

  Since the small diameter portion of the inner cylinder has a claw portion that engages with the inner peripheral portion of the hose, the claw portion can prevent the hose from moving in a direction away from the inner cylinder. As a result, it is possible to suppress the formation of a gap in the joint surface between the joint body and the hose due to a change with time.

According to a fourth aspect of the present invention, in the pipe joint according to the third aspect , the claw portion is formed at a tip end portion of the small diameter portion extending in the hose.

  Since the claw is formed at the tip of the small-diameter portion that extends into the hose, the hose can be separated from the inner cylinder as compared with the configuration in which the claw is formed at the middle or root of the small-diameter portion. It can be effectively suppressed.

According to a fifth aspect of the present invention, in the pipe joint according to any one of the first to fourth aspects, the inner diameter of the hose, the inner diameter of the flow path of the joint body, the inner diameter of the seal member, and the inner cylinder The inner diameter is the same.

In the pipe joint according to the fifth aspect of the present invention, the inner diameter of the hose, the inner diameter of the flow path of the joint body, the inner diameter of the seal member, and the inner diameter of the inner cylinder are the same. For this reason, it is hard to produce a level | step difference in the junction part of the flow path of a hose and a coupling main body, and it is hard to produce a liquid pool in these level | step-difference parts.

As described above, the pipe joint according to the first aspect of the present invention and the pipe joint according to the second aspect of the present invention can suppress liquid pooling at the joint surface between the joint body and the hose.

The pipe joint according to the third aspect of the present invention can suppress a liquid pool on the joint surface between the joint body and the hose.

The pipe joint of the present invention according to claim 4 can effectively suppress the hose from being detached from the inner cylinder.

The pipe joint of the present invention according to claim 5 can suppress liquid pooling at the joint surface between the joint body and the hose.

It is a half-cut sectional view which shows the connection state in 1st Embodiment of the pipe joint of this invention. It is a half cut sectional view showing the state before connection in a 1st embodiment of the pipe joint of the present invention. It is a perspective view which shows the connection state in 1st Embodiment of the pipe joint of this invention. (A)-(D) are explanatory drawings which show the process of shaping an inner cylinder in 1st Embodiment of the pipe joint of this invention. It is a half section view which shows the state before the connection in 2nd Embodiment of the pipe joint of this invention. It is a half-cut sectional view which shows the connection state in 2nd Embodiment of the pipe joint of this invention. It is a half-cut sectional view which shows the connection state in 3rd Embodiment of the pipe joint of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a half sectional view showing a connected state of a pipe joint 10 according to an embodiment of the present invention, and FIG. 2 is a half cut sectional view showing a state before the pipe joint 10 is connected. FIG. 3 is a perspective view showing a connected state of the pipe joint 10.

As shown in FIG. 3, the joint body 12 of the pipe joint 10 is an elbow pipe bent in an L shape (elbow shape), and one end of the joint body 12 is a pipe that holds the tubular body 14. It is a body holding part 12A. The other end of the joint body 12 is a hose holding portion 12B that holds the hose 16. For example, a resin tube can be used as the hose .

  As shown in FIG. 1, a flow path 18 through which a liquid such as beer flows is formed in the core portion of the joint body 12 of the pipe joint 10. In addition, since beer has a great influence on the taste due to the liquid pool, it is particularly preferable to suppress the liquid pool using the pipe joint 10 of the present embodiment. The tube body holding portion 12A and the hose holding portion 12B are formed at both ends of the flow path 18, and the tube body holding portion 12A and the hose holding portion 12B are connected by the flow path 18. A male screw 20 is formed on the outer periphery of the hose holding portion 12B, and a cap nut 22 as a holding member is screwed to the male screw 20.

  As shown in FIG. 2, a large-diameter portion 26 having a diameter larger than that of the flow path 18 is formed in the inner peripheral portion of the hose holding portion 12B, and rubber or the like is formed on the bottom portion 26A of the large-diameter portion 26. A ring-shaped seal member 28 made of an elastic body is disposed. Further, the inner diameter R1 of the sealing member 28 is equal to the inner diameter R2 of the flow path 18 and the inner diameter R3 of the hose 16 (R1 = R2 = R3).

  Further, a metal inner cylinder (also referred to as a core fitting) 30 is provided on the inner peripheral portion of the large-diameter portion 26, and the sealing member 28 is a large-diameter portion 26 that is a surface facing the end surface 16 </ b> A of the hose 16. Between the bottom portion 26 </ b> A and the large-diameter portion 32 of the inner cylinder 30. Further, the inner diameter R4 of the inner cylinder 30 is equal to the inner diameter R1 of the seal member 28, the inner diameter R2 of the flow path 18, and the inner diameter R3 of the hose 16 (R1 = R2 = R3 = R4). Although it is preferable to set R1 = R2 = R3 = R4 in order to eliminate a step on the inner peripheral surface of the pipe joint 10, the inner diameter R1 of the seal member 28, the inner diameter R2 of the flow path 18, and the inner diameter R3 of the hose 16 are set. And the inner diameter R4 of the inner cylinder 30 may not be equal.

  A cylindrical small-diameter portion 34 is formed from the large-diameter portion 32 of the inner cylinder 30 in a direction opposite to the seal member 28, and the small-diameter portion 34 has an outer diameter smaller than that of the large-diameter portion 32. Yes. Further, a claw portion 34 </ b> A having a triangular convex shape toward the radially outer side is formed in a ring shape along the circumferential direction of the small diameter portion 34 at the distal end portion of the small diameter portion 34.

  The end surface 16A of the hose 16 is in contact with the end surface 32A opposite to the seal member 28 in the large-diameter portion 32 of the inner cylinder 30. In addition, although it is preferable that the end surface 16A of the hose 16 contacts the end surface 32A of the large-diameter portion 32 of the inner cylinder 30, it does not need to contact. Further, the claw portion 34 </ b> A of the small diameter portion 34 of the inner cylinder 30 is engaged with the inner peripheral portion 16 </ b> B of the hose 16, so that the hose 16 is difficult to come off from the hose holding portion 12 </ b> B of the joint body 12.

  On the other hand, a female screw 40 is formed on the inner peripheral portion 22A of the cap nut 22, and this female screw 40 is screwed into the male screw 20 provided on the outer peripheral portion of the hose holding portion 12B. An opening 44 through which the hose 16 can be inserted is formed in the bottom 22B of the cap nut 22. Further, a cylinder 50 as a hose holding means is provided inside the cap nut 22, and the hose 16 can be inserted into the cylinder 50. Further, the cylindrical body 50 can be inserted into the large-diameter portion 26 of the hose holding portion 12B, and the outer diameter of the cylindrical body 50 is substantially equal to the inner diameter of the large-diameter portion 26.

  Therefore, as shown in FIG. 2, the hose 16 is inserted into the opening 44 of the cap nut 22 and the cylindrical body 50, and then the small diameter portion 34 of the inner cylinder 30 is inserted into the hose 16, thereby This end face 16A can be brought into contact with the end face 32A of the large diameter portion 32 of the inner cylinder 30. Note that the end surface 16A of the hose 16 is preferably brought into contact with the end surface 32A of the large-diameter portion 32 of the inner cylinder 30, but may not be contacted.

  Further, as shown in FIG. 1, the female screw 40 of the cap nut 22 is screwed into the male screw 20 of the hose holding portion 12 </ b> B of the joint body 12, so that the bottom portion 22 </ b> B of the cap nut 22 is inserted through the cylinder body 50. The large-diameter portion 32 of the tube 30 is pressed in the direction of the bottom portion 26A of the large-diameter portion 26 in the hose holding portion 12B of the joint body 12 (the direction of arrow A in FIG. 1). For this reason, the seal member 28 is sandwiched between the bottom portion 26 </ b> A of the large diameter portion 26 and the large diameter portion 32 of the inner cylinder 30 so as to be compressed. On the other hand, the hose 16 is clamped in the radial direction of the hose 16 by the small diameter portion 34 and the cylindrical body 50 of the inner cylinder 30, and the claw portion 34A of the small diameter portion 34 bites into the inner peripheral portion 16B of the hose 16. .

Further, since the inner diameter R1 of the seal member 28, the inner diameter R2 of the flow path 18, the inner diameter R3 of the hose 16, and the inner diameter R4 of the inner cylinder 30 are equal, a step is hardly generated at the connecting portion between the flow path 18 and the hose 16. Yes.

(How to shape the inner cylinder)
Next, a method for making the inner diameter R4 of the inner cylinder 30 equal to the inner diameter R1 of the seal member 28, the inner diameter R2 of the flow path 18, and the inner diameter R3 of the hose 16 will be described with reference to FIG. If the inner diameter R4 of the inner cylinder 30 is made equal to the inner diameter R1 of the seal member 28, the inner diameter R2 of the flow path 18, and the inner diameter R3 of the hose 16 from the beginning, the small diameter portion 34 of the inner cylinder 30 is inserted into the hose 16. It becomes difficult. For this reason, the inner diameter R5 of the inner cylinder 30 is changed from the inner diameter R4 to the inner diameter R4 by shaping (R5 <R4).
As shown in FIG. 4 (A), one end of the hose 16 previously inserted through the cap nut 22 (not shown) is passed through the cylinder 50, and as shown in FIG. 4 (B), the small diameter of the inner cylinder 30 is passed. The part 34 is inserted into the hose 16.

  Next, as shown in FIG. 4C, the jig 90 is press-fitted into the inner cylinder 30. At this time, the outer diameter R4 of the press-fitting side tip 90A of the jig 90 is slightly larger than the inner diameter R5 of the inner cylinder 30 before press-fitting. For this reason, after the jig 90 is press-fitted into the inner cylinder 30, as shown in FIG. 4D, when the jig 90 is pulled out from the inner cylinder 30, the inner diameter of the inner cylinder 30 is enlarged to become the inner diameter R4.

  For this reason, the inner diameter R4 of the inner cylinder 30 can be made equal to the inner diameter R1 of the seal member 28, the inner diameter R2 of the flow path 18, and the inner diameter R3 of the hose 16.

(Function and effect)
Next, the operation of the pipe joint 10 will be described.
In this embodiment, the cap nut 22 is screwed into the male screw 20 of the hose holding portion 12B in the joint main body 12 of the pipe joint 10, and the cap nut 22 is rotated in the screwing direction (the direction of arrow A in FIGS. 1 and 2). .

  As a result, the bottom 22B of the cap nut 22 presses the large diameter portion 32 of the inner cylinder 30 through the cylinder 50 in the direction of the bottom 26A of the large diameter portion 26 (the direction of arrow A in FIG. 1). For this reason, the seal member 28 is sandwiched and compressed between the bottom portion 26 </ b> A of the large diameter portion 26 and the large diameter portion 32 of the inner cylinder 30. On the other hand, the hose 16 is clamped in the radial direction of the hose 16 by the small diameter portion 34 and the cylindrical body 50 of the inner cylinder 30, and the claw portion 34A of the small diameter portion 34 bites into the inner peripheral portion 16B of the hose 16.

  Accordingly, the seal member 28 is sandwiched between the bottom portion 26A of the large diameter portion 26 of the hose holding portion 12B and the large diameter portion 32 of the inner cylinder 30 in a state where the hose 16 is held by the hose holding portion 12B of the joint body 12. The end surface 16 </ b> A of the hose 16 is disposed on the outer peripheral portion of the small diameter portion 34 of the inner cylinder 30 while being compressed. For this reason, it can suppress that a clearance gap is formed in the joint surface of the joint main body 12 and the hose 16 with a time-dependent change. As a result, liquid can be prevented from entering the gap and becoming a liquid pool. Moreover, it can also suppress that a liquid leaks from the pipe joint 10. FIG.

  In the present embodiment, the small diameter portion 34 of the inner cylinder 30 extends in the hose 16, and the claw portion 34 </ b> A formed in the small diameter portion 34 engages with the inner peripheral portion 16 </ b> B of the hose 16. For this reason, the claw portion 34 </ b> A of the small diameter portion 34 can suppress the hose 16 from moving in a direction away from the small diameter portion 34 of the inner cylinder 30. As a result, it is possible to suppress a gap from being formed on the joint surface between the joint body 12 and the hose 16 due to a change with time.

  In the present embodiment, since the claw portion 34A is formed at the distal end portion of the small diameter portion 34 of the inner cylinder 30, the hose is compared with a configuration in which the claw portion 34A is formed at the intermediate portion or the root portion of the small diameter portion 34. It is possible to effectively suppress the separation of 16 from the inner cylinder 30.

  Moreover, in the pipe joint 10 of this embodiment, the bottom part 26 </ b> A of the large diameter part 26 of the hose holding part 12 </ b> B in the joint main body 12 and the end face of the hose 16 with the hose 16 held in the hose holding part 12 </ b> B of the joint main body 12. An annular seal member 28 and a large-diameter portion 32 of a metal inner cylinder 30 are provided between 16A and 16A. The inner diameter R1 of the seal member 28, the inner diameter R2 of the flow path 18, and the inner diameter R3 of the hose 16 are provided. And the inner diameter R4 of the inner cylinder 30 is equal (R1 = R2 = R3 = R4). For this reason, a level | step difference does not generate | occur | produce easily in the junction part of the hose 16 and the flow path 18 of the coupling main body 12, and a liquid pool does not generate | occur | produce easily in this site | part.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.
In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, in the pipe joint 10 of the present embodiment, the seal member 28 is baked on the inner cylinder 30, and the inner cylinder 30 and the seal member 28 are one component.

  Therefore, in this embodiment, the number of parts can be reduced as compared with the first embodiment, and the assembly workability is improved.

  In the present embodiment, as shown in FIGS. 5 and 6, a cylindrical tube portion 22 </ b> C as a part of the hose holding means is integrally formed inside the cap nut 22. The cylindrical portion 22C is formed so as to protrude from the bottom portion 22B, and the inner peripheral portion is reduced in diameter from the tip toward the root, forming an inclined surface 22D. Further, a collet 60 as a part of the hose holding means is provided on the outer peripheral portion of the hose 16. The outer peripheral surface of the collet 60 is an inclined surface 60A whose diameter is increased toward the large-diameter portion 32 side of the inner cylinder 30, and the inclined surface 60A and the cylindrical portion of the collet 60 are screwed by screwing the cap nut 22 into the hose holding portion 12B. The collet 60 is reduced in diameter by sliding with the inclined surface 22D of 22C.

  For this reason, by screwing the cap nut 22 into the male screw 20 of the hose holding part 12B in the joint body 12 of the pipe joint 10, the tip part of the cylinder part 22C is a large diameter part of the inner cylinder 30 as shown in FIG. 32 is pressed in the direction of the seal member 28 (in the direction of arrow A in FIG. 6), and the hose 16 is sandwiched in the radial direction of the hose 16 by the small diameter portion 34 and the collet 60 of the inner cylinder 30. The part 34 </ b> A bites into the inner peripheral part 16 </ b> B of the hose 16.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
In addition, about the same member as 1st, 2 embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. Moreover, in this embodiment, it can be set as the structure which the hose 16 is not pressed to radial direction center side by screwing of the cap nut 22 by eliminating a collet or adjusting the dimension of components. By doing in this way, in this embodiment, formation of the level | step difference to the internal peripheral surface where a liquid flows further can be suppressed, and generation | occurrence | production of a liquid pool can be suppressed.

  As shown in FIG. 7, in the present embodiment, a claw portion 34 </ b> A that is convex outward in the radial direction is formed at the distal end portion of the small diameter portion 34 of the inner cylinder 30, and the axial direction of the small diameter portion 34. A claw portion 34B having a convex shape toward the radially outer side is also formed in the intermediate portion. For this reason, the small diameter portion 34 includes two claw portions, a claw portion 34A and a claw portion 34B. Note that the configuration in which the small diameter portion 34 includes two claw portions of the claw portion 34 </ b> A and the claw portion 34 </ b> B is not an indispensable configuration. Can be prevented from being pulled out. For this reason, since the necessity to press the hose 16 to radial direction center side with the cap nut 22 can be reduced, it can be used especially suitably.

  The claw portion 34A at the tip is mainly intended for sealing performance of the pipe joint 10, and the claw portion 34B at the intermediate portion is mainly intended for holding (chucking) the hose 16. For this reason, compared with the claw portion 34A at the front end, the claw portion 34B at the middle portion has a sharper angle at the top of the convex shape, and is easy to bite into the hose 16.

  Therefore, in this embodiment, the sealing performance is improved and the holding performance of the hose 16 is also improved as compared with the first and second embodiments. In addition, it is good also as a structure which formed the nail | claw part in the three or more site | parts along the axial direction in the small diameter part 34 of the inner cylinder 30. FIG.

(Other embodiments)
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in each of the above embodiments, beer is flowed as a liquid, but the present invention is not limited to this, and carbonated drinks and other fluids are also applicable.

  Moreover, in each said embodiment, although the joint main body 12 of the pipe joint 10 was made into the elbow pipe bent by L shape (elbow shape), the joint main body 12 of the pipe joint 10 is not limited to L shape, I Other shapes such as a letter shape may be used.

DESCRIPTION OF SYMBOLS 10 Pipe joint 12 Joint main body 12A Pipe body holding part of joint main body 12B Hose holding part of joint main body 14 Pipe body 16 Hose (hose)
18 Joint body flow path 22 Cap nut (holding member)
22C Cap nut part (hose holding means)
28 Seal member 30 Inner cylinder 32 Large diameter part of inner cylinder 34 Small diameter part of inner cylinder 34A Claw part 34B Claw part 50 Cylindrical body (hose holding means)
60 Collet (Hose holding means)

Claims (5)

A joint body comprising: a flow path through which a fluid flows; and a hose holding portion that is formed at an end of the flow path and holds a hose;
An annular seal member that is provided on a surface facing the end surface of the hose in the inner peripheral portion of the hose holding portion and faces the flow path;
A metal inner cylinder provided in an inner peripheral portion of the hose holding portion, a large diameter portion provided between an end surface of the hose and the seal member, and a small diameter portion inserted in the inner peripheral portion of the hose; ,
Hose holding means provided on the outer peripheral side of the small-diameter portion of the inner cylinder, holding the hose and contacting the large-diameter portion of the inner cylinder ;
A holding member that holds the large-diameter portion of the inner cylinder pressed against the seal member via the hose holding means by screwing into the outer peripheral portion of the hose holding portion and screwing;
Pipe fittings with A flow path through which a fluid flows, and a hose holding section formed at an end portion of the flow path and holding a hose and including a large-diameter portion whose inner peripheral portion is larger in diameter than the flow path. A fitting body provided;
An annular sealing member that is provided on a surface facing the end surface of the hose in the large-diameter portion of the hose holding portion and faces the flow path;
A metal inner cylinder provided in a large diameter portion of the hose holding portion, a large diameter portion provided between an end surface of the hose and the seal member, and a small diameter portion inserted in an inner peripheral portion of the hose; ,
Hose holding means provided on the outer peripheral side of the small diameter part of the inner cylinder in the large diameter part of the hose holding part, and holding the hose and contacting the large diameter part of the inner cylinder;
A holding member that holds the large-diameter portion of the inner cylinder pressed against the seal member via the hose holding means by screwing into the outer peripheral portion of the hose holding portion and screwing;
Pipe fittings with The pipe joint according to claim 1 or 2 , wherein the small-diameter portion of the inner cylinder has a claw portion that engages with an inner peripheral portion of the hose. The pipe joint according to claim 3 , wherein the claw portion is formed at a distal end portion of the small-diameter portion that extends in the hose. The pipe joint according to any one of claims 1 to 4 , wherein an inner diameter of the hose, an inner diameter of a flow path of the joint body, an inner diameter of the seal member, and an inner diameter of the inner cylinder are the same.