JP2011089598A - Joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate attachment of a c-ring to a cap nut in a union joint having a nipple, a union flange insert-molded on a resin joint, the union cap nut attached to the union flange and screwed into the nipple, and the c ring fitted to an inner peripheral groove of the cap nut and locking the cap nut. <P>SOLUTION: In the cap nut 12, an opening part 18 on a side to which the union flange 11 is fitted has a diameter gradually enlarged toward an opening end and is formed in a tapered shape, and the inner peripheral groove 19 is formed on an inner side of the opening part 18. When the union flange 11 and the cap nut 12 are installed, the c-ring 13 is attached to the opening part 18 of the cap nut 12, and after that, one of the union flange 11 and the cap nut 12 is pushed into the other. When the c-ring 13 is pushed into the opening part 18 in a step 16, the c-ring 13 goes to the inner side while being reduced in the diameter. Then, the c-ring 13 reaches the inner peripheral groove 19, and is fitted to the inner peripheral groove 19, and is enlarged, and is fixed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention, for example, in piping equipment such as gas pipes, water and sewage officers, steam pipes, etc., between pipes, pipes and connection ports of fluid equipment (in the specification, pipe ends of pipes, connection ports of fluid equipment, etc. In particular, the present invention relates to a joint including a fixed joint member and a movable joint member that is secured to the fixed joint member and is rotatably attached thereto.

One of the joints provided with a fixed joint member and a movable joint member is a union joint.
FIG. 1 shows an example of this kind of union joint disclosed in Patent Document 1, and is connected to a pipe end or a nipple 1 connected to the pipe end via a joint and a tubular part. As shown in the figure, a union rod 3 as a fixed joint member that is insert-molded into a resin joint 2 and a cap nut 4 as a movable joint member that is secured to the union rod 3 by a collar and rotatably mounted. The nipple 1 and the union rod 3 are connected by screwing into the nipple 1 a cap nut 4 that is configured and is secured to the union rod 3 and is rotatably mounted. In the figure, 5 is an o-ring that seals between the nipple 1 and the union rod 3.

  In the union joint, a cap or nut is formed in order to prevent the cap nut from being pulled out from the union cage and to be fastened by the cap nut. The cap nut is inserted from the side of the union cage that has no flange (right direction in FIG. 1). 1, when the union rod 3 is insert-molded into the joint 2 as shown in FIG. 1 or when the large diameter portion is formed in the union rod 3, the cap nut is caused by the presence of the collar, the joint, or the large diameter portion. 4 cannot be attached to the union 鍔 2.

  As shown in FIG. 2, when the large diameter portion 7 a through which the cap nut 8 as the movable joint member cannot be passed is formed in the union rod 7 as the fixed joint member, the union rod 7 is attached to the cap nut 8. A c-ring 9 is attached to the inner circumferential groove of the cap nut 8 to be engaged with the step 7b of the union rod 7 in order to prevent the cap nut 8 from coming off. In this case, the union rod 7 is attached by press fitting after the c-ring 9 is mounted in the inner circumferential groove of the cap nut 8.

Another example of a joint provided with a fixed joint member and a movable joint member is a rotary pipe joint.
This type of rotary joint includes a fixed joint member having a fitting portion and a movable joint member having an insertion portion that is inserted into the fitting portion so as to be rotatable and detachable. Of the fitting portion and the insertion portion, An annular groove is formed on one of the joint surfaces, and a radial hole is formed on the other joint surface toward the annular groove. A ball is fitted into the annular groove through the hole, and a screw is inserted into the hole. The structure is screwed and fastened (Patent Document 2).

JP 2000-220780 A JP-A-8-200575

  The c-ring 9 for retaining shown in FIG. 2 has a stronger retaining function than the ball, but is not as easy to mount as the ball. When the c-ring 9 is attached to the cap nut 8, conventionally, a jig is used and the c-ring 9 is attached by being pushed into the inner peripheral groove of the cap nut 8 with the diameter reduced.

  An object of this invention is to provide the coupling of the structure which can mount | wear with the c ring for retaining easily.

The invention according to claim 1 is a joint used when connecting tubular parts such as pipes of piping equipment and pipes and connection ports of fluid equipment, and is fixed to the fixed joint member and fixed to the fixed joint member and is rotatable. The movable joint member is attached to the fixed joint member, and the movable joint member is prevented from coming off from the fixed joint member by pushing in from the opening on one side of either the movable joint member or the fixed joint member. In the c-ring fitted in the inner circumferential groove and the coupling formed by the step or the edge of the groove formed on the other coupling member and partially locked to the c-ring protruding from the inner circumferential groove, The opening of the joint member is formed such that the diameter gradually increases toward the opening end,
In the invention according to claim 2, the joint of the invention according to claim 1 is a union joint, one joint member is a cap nut, and the other joint member has a large diameter portion that cannot be inserted into the cap nut. It is characterized by having.

  In the present invention, the c-ring is attached to one of the movable joint member and the fixed joint member by attaching the c-ring to the opening end of the opening, or to the one side of the other joint member. Is attached by pushing either one of the joint members into the other. Reach the circumferential groove. When it reaches the inner circumferential groove, it expands into the groove and is fixed. After the c-ring is fitted in the inner circumferential groove, one joint member is prevented from coming off by being engaged with a step having a different diameter formed on the other joint member or an edge of the inner circumferential groove.

  According to the present invention, the c-ring is fitted to one of the movable joint member and the fixed joint member when the movable joint member and the fixed joint member are press-fitted, and the diameter of the c-ring is not reduced by a tool. Since it is performed with the other joint member being pushed into the opening, the c-ring can be easily mounted.

  In the joint of the present invention, both joint members are prevented from coming off by a c-ring attached to one joint member and a step or groove edge formed on the other joint member and engaged with the c-ring. The other joint member may have a large-diameter portion that cannot be inserted into one joint member, or the other joint member may be formed by insert molding.

It is possible to attach one joint member to the other joint member by the method described above regardless of whether or not the other joint member has a large diameter portion and whether or not it is insert-molded. .
In addition, when the other joint member is insert-molded, it can be insert-molded with one joint member mounted on the other joint member, and after the other joint member is insert-molded, It can also be installed.

Further, when the other joint member is insert-molded, if the insert portion is provided with a large-diameter portion, the contact area with the resin can be increased, and the adhesive strength can be increased.

Sectional drawing of the conventional union joint. Sectional drawing of the prior art example which assembled | attached the union cage | basket and the cap nut. The exploded view before the assembly | attachment of the union cage | basket concerning this invention and a cap nut. Sectional drawing which shows the state which mounted | wore the cap nut shown in FIG. 3 with the c ring. Sectional drawing which shows the state which inserted the union cage | basket in the cap nut. Sectional drawing which shows the state which c-ring fitted to the inner periphery groove | channel. Sectional drawing which shows a state when a union cage | basket and a cap nut are separated to the maximum. Sectional drawing when assembling an elbow joint to a fixed joint member. Sectional drawing when a fixed joint member is pushed into an elbow joint. Sectional view when the fixed joint member is assembled to the elbow joint

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 shows a union rod 11 which is one of the joint members of the fixed joint member and the movable joint member, a cap nut 12 which is the other joint member assembled to the union rod 11, and a cap nut. 12 shows a c-ring 13 for retaining the union, and the union rod 11 is provided with a large-diameter portion 14 that cannot be inserted into the cap nut 12 and steps 15 and 16 that can be engaged with the c-ring 13 at the front and rear. Yes.

The cap nut 12 has a tapered shape in which the opening 18 on the side where the union bar 11 is inserted is gradually enlarged toward the opening, and an inner circumferential groove 19 is formed on the inner side of the opening 18. .
The c-ring 13 has a shape in which a part of the o-ring is cut out, and the outer diameter is preferably the same as or slightly smaller than the maximum diameter opening of the opening 18, but is slightly larger. May be.

  When assembling the union rod 11 and the cap nut 12, first, the c-ring 13 is attached to the opening of the opening 18 of the cap nut 12. When the outer diameter of the c-ring 13 is slightly larger than the opening of the maximum diameter of the opening 18, the c-ring 13 is narrowed and attached to the opening of the opening 17 (FIG. 4).

  Next, either the union barn 11 or the cap nut 12 is pushed into the other. When the edge of the end surface of the union rod 11 hits the c-ring 13 by pushing, the c-ring 13 is once expanded to accept the union rod 11. If pushing is continued in this state, the union rod 11 is pushed through the c-ring 13, and the c-ring 13 is accommodated in the steps 15 and 16 before long. The c-ring 13 that has passed through the step 15 is reduced in diameter and restored while remaining in the opening of the opening 18. If the insertion is continued with the c-ring 13 in the steps 15 and 16, the edge of the step 16 hits the ring 13 (FIG. 5). In this state, when one of the union rod 11 and the cap nut 12 is strongly pushed toward the other, the c-ring that is locked to the edge of the step 16 is guided to the opening 18, and the diameter of the opening narrows toward the back of the opening. It is pushed in while reducing the diameter. Then, it reaches the inner circumferential groove 19 and fits and expands in the inner circumferential groove 19 to be in a fixed state (FIG. 6).

As described above, the c-ring 13 is mounted in the inner circumferential groove 19 by pushing the union bar 11, and the union bar 11 and the cap nut 12 are also assembled with the mounting of the c-ring 13.
After assembling the union rod 11 and the cap nut 12, in the state of FIG. 7, the nipple 1 shown in FIG. 1, connection to the pipe end or the connection port of the fluid device, or the union rod 11 and other pipe end Connection to the joint or insert molding of the union rod 11 is performed before and after.

  The union rod 11 of the above embodiment has a large-diameter portion 14 that cannot be inserted into the cap nut 12, but in another embodiment, there is no large-diameter portion and can be inserted into the cap nut 12. It is formed like a union cage 3 shown in FIG. When the union rod 11 is assembled to the cap nut 12 after insert molding, the assembly can be performed in the same manner as described above.

  FIG. 8 shows a fixed joint member 21 connected to the tubular portion, an elbow joint 22 as a movable joint member connected to the fixed joint member 21, and a c-ring 23 for preventing both of them from being fixed. The joint member 21 has three outer peripheral grooves 24, 25, 26 formed on one outer peripheral surface, and a tubular portion is screwed to the other side to be connected. An o-ring 27 for sealing is attached to each 25, and the outer circumferential groove 26 has a dovetail shape, and the edge of the circumferential groove is locked to the c-ring 23.

The elbow joint 22 has a tapered portion 29 having a diameter that gradually increases toward the opening at an opening portion on the side to be inserted into the fixed joint member 21, and an inner circumferential groove 31 is formed on the back side of the tapered portion 29. ing.
The c-ring 23 has the same diameter as the inner circumferential groove 31, but may be formed slightly larger.

  When assembling the fixed joint member 21 and the elbow joint 22, first, the c-ring 23 is slightly expanded and inserted from one end of the fixed joint member 21 and attached to the outer circumferential groove 26. Since the c-ring 23 has the same diameter as the inner circumferential groove 31 without applying an external force, the c-ring 23 floats from the groove bottom of the outer circumferential groove 26 as shown in FIG. .

Next, the fixed joint member 21 is pushed into the elbow joint 22 (FIG. 8). The o-ring 27 attached to the outer circumferential grooves 24 and 25 is inserted into the opening by pushing, and the c-ring 23 hits the tapered portion 29 (FIG. 9). When the fixed joint member 21 is strongly pushed into the elbow joint 22 in this state, the c-ring 23 is pushed by the edge of the outer peripheral groove 26 that is locked to the ring 23, and is pushed forward while being reduced in diameter by being guided by the tapered portion 29. The inner circumferential groove 31 is reached. And it expands and it fits in this inner peripheral groove 31, and will be in a fixed state (FIG. 10).
As described above, the c-ring is fitted into the inner circumferential groove 31 by pressing the fixed joint member 21, whereby the elbow joint 22 is connected in a state of being prevented from being detached by the fixed joint 21.

In the embodiment, the elbow joint 22 is a movable joint member, but the elbow joint may be a fixed joint member and the fixed joint member 21 may be a movable joint member.
In the above embodiment, the fixed joint member 21 and the elbow joint 22 connected to the joint member 21 have been described. However, the elbow joint 22 may be another joint, for example, a socket joint, a cheese joint, or a cap. A joint may be used.

11 ···················································································································・ Elbow joints 24, 25, 26 ・ ・ Outer peripheral groove 27 ・ ・ O-ring 29 ・ ・ Taper

Claims (2)

  It is a joint used when connecting tubular parts such as pipes of piping equipment and pipes and connection ports of fluid equipment, and consists of a fixed joint member and a movable joint member that is secured to the fixed joint member and rotatably mounted. In order to prevent the movable joint member from coming off the fixed joint member, the movable joint member is pushed into one of the opening portions of the joint member of either the movable joint member or the fixed joint member, and is fitted into the inner peripheral groove on the back side of the opening portion. In a joint formed by a c-ring and a step or groove edge that is formed on the other joint member and partially engages with the c-ring protruding from the inner circumferential groove, the opening of the one joint member is an open end A union joint characterized by being formed so that the diameter gradually increases toward.   The union joint according to claim 1, wherein the joint is a union joint, one joint member is a cap nut, and the other joint member has a large-diameter portion that cannot be fitted into the cap nut.