JP6215585B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint for connecting a three-layer pipe or the like used in a piping system in a water heater or the like.

  Conventionally, as a pipe joint, for example, a cylindrical joint body in which male threads are formed on both sides from the central portion of the outer peripheral surface, and a female screw that fits into the male thread of the joint body is formed on the inner peripheral surface, A receiving member that is screwed concentrically on both sides of the joint body, a grip ring disposed in a portion near the end of the pipe insertion side in the receiving member, and the joint body inside the grip ring There are known ones in which a packing for maintaining the watertightness is mounted between a coil spring interposed therebetween and an end portion and an outer peripheral surface of a pipe inserted into a joint body.

Japanese Patent Laid-Open No. 64-40785

  According to the above-described conventional pipe joint, when the pipe is inserted, the grip ring moves inward of the joint body against the spring force of the coil spring, so that the grip ring is expanded. The grip ring is returned to its original position by the spring force of the coil spring against the force in the pulling direction of the pipe. The pipe is held in the joint body by the wedge action without expanding.

  However, the pipe joint has a drawback that it cannot be used for piping in a limited and narrow space because the structure is complicated and requires labor for assembling, and the overall outer shape becomes large.

  An object of the present invention is to provide a pipe joint that can be reduced in size without complicating the structure and can provide reliable water tightness.

  The present invention according to claim 1 is mounted on a cylindrical plug formed with one or a plurality of concave grooves on which an annular elastic member is mounted on the outer peripheral surface near the other end, and mounted on a portion near one end of the outer periphery of the plug, A base ring formed with a male screw is formed on the outer peripheral surface, and a female screw that fits with the male screw of the base ring is formed on the inner peripheral surface on one end side. The connection confirmation window is formed, the diameter of the pipe decreases from one end side to the other end side, and the entire taper-shaped socket is fitted on the outer periphery of the plug and the pipe inserted from the small diameter end side of the socket is inserted. An expandable / contractible locking split ring that has a wedge-shaped cross section so as to abut against the outer peripheral surface and prevent the pipe from being pulled out, and is disposed adjacent to one side of the locking split ring, and the locking split ring is connected to the pipe. To the opposite side of the insertion direction A ring-shaped leaf spring member, a spacer sleeve interposed between the ring-shaped leaf spring member and the base ring, and a pipe inserted into the socket, and the pipe is completely inserted into a predetermined position in the socket. And a ring for confirmation that is visible from the connection confirmation window of the socket, and the ring-shaped leaf spring member includes a ring-shaped main body and a plurality of spring portions that are rounded up in a circumferential direction from one side of the main body. And a notch for visual recognition communicating with the socket connection confirmation window is formed on one end side of the spacer sleeve.

  According to a second aspect of the present invention, in the pipe joint according to the first aspect, the socket is configured such that the inner peripheral surface of the pipe insertion side portion is an inclined surface having an upward slope toward the pipe insertion direction, and the inclination angle thereof. Is a technical feature in that, among the adjacent inclined surfaces, the inclined surface on the pipe insertion side is steeper than the inclined surface on the opposite side to the pipe insertion side.

According to a third aspect of the present invention, in the pipe joint according to the first or second aspect, the base ring includes a plurality of slits that are formed at predetermined intervals in the circumferential direction and extend in the axial direction. The outer diameter of the base ring can be freely expanded and reduced, and a base flange with which one end side of the socket abuts is provided on one end side of the outer peripheral surface of the base ring.

According to a fourth aspect of the present invention, in the pipe joint according to any one of the first to third aspects, the notch for visually confirming the spacer sleeve is always in communication with the connection confirmation window of the socket. One or a plurality of positioning ridges for regulating the position of the spacer sleeve are provided on the inner surface of the socket, and a groove having a predetermined length corresponding to the positioning ridge is formed in the axial direction on the outer surface of the spacer sleeve. A technical feature is that a notch corresponding to the positioning protrusion is formed on the outer edge of the leaf spring.

According to a fifth aspect of the present invention, in the pipe joint according to any one of the first to fourth aspects, a ring-shaped leaf spring member is fitted into a ring-shaped leaf spring member side end of the spacer sleeve. A step portion is formed.

  The pipe joint of the present invention has an advantage that a three-layer pipe or the like can be easily and reliably connected without complicating the structure.

  That is, according to the pipe joint of the present invention, when the pipe is pushed into the socket together with the connection confirmation ring, the locking split ring moves in the pipe insertion direction against the spring force of the ring-shaped leaf spring member. However, the pipe is expanded and inserted into the predetermined position of the socket together with the connection confirmation ring. After the insertion is completed, the locking split ring is opposite to the pipe insertion direction by the spring force of the ring-shaped leaf spring member. As a result of the locking split ring being reduced to its original diameter and abutting on the outer peripheral surface of the pipe, the inserted pipe is tightened in the socket, and the wedge-shaped cross section of the locking split ring removes the pipe. It can be held firmly so as not to come off against the force in the direction of disengagement.

  Moreover, in the pipe joint of the present invention, since the ring-shaped leaf spring member having a special structure is incorporated instead of the conventional coil spring, the axial length of the pipe joint can be kept short, and this is the structure described above. With this, the overall length of the pipe joint can be shortened compared to the conventional one. As a result, the piping system of the water heater has the special advantage that piping work can be performed easily even in relatively narrow places. Have.

  Furthermore, in the pipe joint according to the second aspect of the present invention, the inner peripheral surface of the pipe insertion side portion of the socket is an inclined surface that is inclined upward in the pipe insertion direction, and the inclination angle is two or more. Among the adjacent inclined surfaces, the inclined surface on the pipe insertion side is steeper than the inclined surface on the opposite side of the pipe insertion side, so that when an external force in the direction of pulling out the pipe is applied, Since the locking split ring immediately comes into contact with the inclined surface, there is an advantage that the movement of the pipe in the removal direction can be surely suppressed.

It is sectional drawing of the pipe joint which concerns on embodiment of this invention, Comprising: The state before pipe insertion is shown. Similarly it is sectional drawing of the pipe joint of embodiment, Comprising: The state after pipe insertion is shown. It is a disassembled perspective view of the pipe joint which concerns on the same embodiment. It is a perspective view of the base ring in the embodiment. It is a front view of the socket in the embodiment. It is a perspective view of the split ring for locking in the embodiment. It is a sectional view of the split ring for lock similarly. It is a perspective view of the ring-shaped leaf | plate spring in the same embodiment. It is a side view of a ring-shaped leaf spring. It is a perspective view of the spacer sleeve in the embodiment. It is a perspective view of the spacer sleeve in the same embodiment, Comprising: It is a thing on the opposite side to FIG. It is sectional drawing of the pipe joint which concerns on other embodiment of this invention. It is a principal part expanded sectional view of the pipe joint of FIG.

  Next, although embodiment of this invention is described according to drawing, this invention is not limited to this embodiment.

  As shown in FIGS. 1 to 3, the pipe joint 10 according to the present embodiment has a flange 2 a with which a cap nut 6 is engaged at the right end, and an annular elastic member 5 is mounted on the outer peripheral surface near the other end. A cylindrical plug 2 having two concave grooves 2b formed therein, a base ring 4 which is attached to a portion near the right end of the outer periphery of the plug 2 and has a male screw 4a formed on the outer peripheral surface, and an inner periphery on the right end side. A female screw 1a that fits with the male screw 4a of the base ring 4 is formed on the surface, and three connection confirmation windows 11 are formed at predetermined intervals in the circumferential direction at a portion near the right end, from the right end side to the left end side The entire diameter of the socket 1 is tapered and the outer periphery of the three-layer pipe P inserted from the small-diameter end side (left end side) of the socket 1 is put on the outer periphery of the tapered socket 1 and the plug 2. The expansion / contraction made wedge-shaped in cross section so as to prevent the pipe P from being pulled out An existing locking split ring 7 and a ring-shaped leaf spring member 9 that is disposed adjacent to the right side of the locking split ring 7 and biases the locking split ring 7 to the side opposite to the insertion direction of the pipe P (left side). And the spacer sleeve 3 interposed between the ring-shaped leaf spring member 9 and the base ring 4 and the tip of the pipe P inserted into the socket 1, and the pipe P completely reaches a predetermined position in the socket 1. The ring-shaped leaf spring member 9 is cut in the circumferential direction from one side of the ring-shaped main body 9a and the main body 9a. A plurality of raised spring portions 9b are formed (see FIGS. 8 and 9), and a visual notch 3a communicating with the connection confirmation window 11 of the socket 1 is formed on the right end side of the spacer sleeve 3. .

  As shown in FIG. 4, the base ring 4 is formed at predetermined intervals in the circumferential direction thereof, and has a total of four slits 12 extending in the axial direction, so that the outer diameter can be expanded and contracted. A base flange 4b with which the right end side of the socket 1 abuts is integrally provided on the right end side of the outer peripheral surface 4.

  Further, as shown in FIGS. 1 and 2, a fitting recess 13 is formed near the right end of the plug 2, and the inner peripheral surface 4 c of the base ring 4 is fitted into the fitting recess 13, thereby providing a base. The ring 4 is attached to a portion near the right end side of the plug 2.

  As shown in FIGS. 1 to 3 and 5, the socket 1 has three connection confirmation windows 11 formed at regular intervals in the circumferential direction, and will be described later on the inner circumferential surface. Three positioning ridges 20 for positioning the spacer sleeve 3 are formed to extend in the axial direction at predetermined intervals in the circumferential direction. Moreover, the inner peripheral surface of the pipe P insertion side portion of the socket 1 is formed as an inclined surface 21 that is inclined upward in the insertion direction of the pipe P.

  As shown in FIGS. 6 and 7, the locking split ring 7 is C-shaped when viewed from the front, and is used for introducing the pipe P so that the inner diameter gradually decreases from the insertion side (left side) portion of the pipe P. The cross-sectional wedge shape has an inclined surface 7a.

  As shown in FIGS. 8 and 9, the ring-shaped leaf spring member 9 is composed of the ring-shaped main body 9a and a plurality of spring portions 9b that are rounded up from one side of the main body 9a as described above. In the present embodiment, in the ring-shaped main body 9a, the four spring portions 9b are obliquely cut up in the same direction with a predetermined interval.

  As shown in FIGS. 10 and 11, the spacer sleeve 3 is substantially cylindrical as a whole, and the above-described visual notch 3 a is formed at three positions at predetermined intervals on the right end of the spacer sleeve 3. In addition, an engagement groove 14 having a predetermined length corresponding to the positioning protrusion 20 in the socket 1 is formed in the axial direction on the outer peripheral surface, whereby the visual notch 3a of the spacer sleeve 3 always confirms the connection of the socket 1. The position of the spacer sleeve 3 is regulated so as to communicate with the window 11 for use.

Further, a step portion 3 d into which the ring-shaped leaf spring member 9 is fitted is formed at the end of the spacer sleeve 3 on the ring-shaped leaf spring member 9 side.

  Next, the connection point of the three-layer pipe P by the pipe joint 10 according to the present embodiment will be described. First, as shown in FIG. 1, the confirmation ring 8 is provided at the tip from the left end opening of the socket 1 toward the outer periphery of the plug 2. When the three-layer pipe P in the state of contact is pushed in, the tip of the pipe P comes into contact with the locking split ring 7, and the locking split ring 8 is socketed against the spring force of the ring-shaped leaf spring member 9. 1 Move inward. At this position, the locking split ring 7 expands in the socket 1 having a larger diameter, and accordingly, the pipe P penetrates the locking split ring 7 and enters further into the socket 1. And finally, as shown in FIG. 2, it reaches the left end side part of the base ring 4 which is the innermost part. In this state where the pipe P is completely inserted, the confirmation ring 8 can be seen from the connection confirmation window 11 of the socket 1 at the tip of the pipe P, so that the complete insertion of the pipe P can be confirmed.

  Further, as described above, after the pipe P is inserted into the pipe joint 10, the locking split ring 7 moves to the opposite side (left side) to the insertion direction of the pipe P by the spring force of the ring-shaped leaf spring member 9. In addition to being pushed back, the wedge-shaped cross section engages with the inclined surface 21 on the right side of the protrusion 1e on the left end of the socket 1 in a wedge-like contact with the end portion. Even if a force on the left side) is applied, the pipe P is firmly held in the pipe joint 10.

The pipe joint 30 shown in FIG. 12 and FIG. 13 relates to another embodiment in which a part of the pipe joint 10 described above is changed, and in the socket 31 whose overall shape is the same as the socket 1, the pipe The point that the inner peripheral surface of the insertion side portion is an upward inclined surface in the pipe insertion direction is the same as in the above embodiment, but in this embodiment, the inclination angle is two steps, and the pipe is inserted. The inclined surface 21A on the side is steeper than the inclined surface 21B on the opposite side to the pipe insertion side. And in this embodiment, when the external force of the direction which pulls out the pipe P is applied by setting it as such a structure, since the said split ring 7 for a lock | rock will contact | abut immediately on the steeply inclined surface 21B, pipe P Therefore, the movement in the removal direction is reliably suppressed.
Since the other structure is the same as that of the above-described embodiment, the description of other parts is omitted by attaching the same reference numerals to the drawings. In the present embodiment, the inclined surface 21A and the inclined surface 21B having different inclination angles are used on the inner peripheral surface of the socket 31, but the inclined surfaces may be three or more.

  According to the pipe joint of the present invention, the pipe can be firmly connected without complicating the structure, and the overall outer shape can be reduced, so that it can be used in a narrow space. Wide use in the field of systems can be expected.

P Three-layer pipe 1 Socket 1a Socket female screw 2 Plug 2a Plug flange 2b Plug groove 3 Spacer sleeve 4 Base ring 4a Base ring male screw 5 Annular elastic member 6 Cap nut 7 Lock split ring 8 Check ring 9 Ring-shaped leaf spring member 10 Pipe joint 11 Connection confirmation window

Claims (4)

A cylindrical plug in which one or a plurality of concave grooves are formed on the outer peripheral surface near the other end, and a male plug is formed on the outer peripheral surface. The base ring and a female screw that fits with the male screw of the base ring are formed on the inner peripheral surface on one end side, and a plurality of connection confirmation windows are formed at predetermined intervals in the circumferential direction at a portion near one end, The entire taper, whose diameter decreases from one end side to the other end side, is fitted on the outer periphery of the plug and the outer periphery of the plug, and comes into contact with the outer peripheral surface of the pipe inserted from the smaller end of the socket. An expandable / contractible locking split ring that has a wedge-shaped cross section to prevent removal, and is placed adjacent to one side of the locking split ring to bias the locking split ring to the opposite side of the pipe insertion direction Ring-shaped leaf spring member The spacer sleeve is interposed between the ring-shaped leaf spring member and the base ring, and the socket is connected at the tip of the pipe inserted into the socket so that the pipe is completely inserted to a predetermined position in the socket. A ring for confirmation that is visible from a confirmation window, and the ring-shaped leaf spring member is composed of a ring-shaped main body and a plurality of spring portions that are rounded up from one side of the main body in the circumferential direction, and a spacer. A visual notch communicating with the socket connection confirmation window is formed on one end of the sleeve, and the inner peripheral surface of the pipe insertion side portion of the socket is an inclined surface inclined upward in the pipe insertion direction. and there is the inclination angle of two stages or more, among the inclined surfaces adjacent the inclined surface of the pipe insertion side is made steeper than the inclined surface on the side opposite to the pipe insertion side, the pipe joint The base ring is formed at a predetermined interval in the circumferential direction thereof, and has a plurality of slits extending in the axial direction, so that the outer diameter can be expanded and contracted, and one end of the socket is provided on one end side of the outer peripheral surface of the base ring. The pipe joint according to claim 1 , wherein a base flange against which the side abuts is provided. One or more positioning protrusions that regulate the position of the spacer sleeve are provided on the inner surface of the socket so that the notch for visual recognition of the spacer sleeve is always in communication with the connection confirmation window of the socket. groove having a predetermined length corresponding to the positioning projection strip is formed in the axial direction, characterized in that the notch corresponding to the positioning projection strip to the outer edge of the ring-shaped plate spring is formed, according to claim 1 or The pipe joint according to claim 2 . The pipe joint as described in any one of Claims 1-3 in which the step part in which a ring-shaped leaf | plate spring member is inserted is formed in the ring-shaped leaf | plate spring member side end in a spacer sleeve.

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