JP4864514B2 - Resin pipe joint - Google Patents

Description

  The present invention relates to a resin pipe connection joint. Specifically, the resin tube is inserted into the connecting tube portion of the joint body, and the inner peripheral surface of the resin tube is engaged with a serrated engaging tooth portion provided on the connecting tube portion side. The present invention relates to a resin pipe connection joint that is configured to be retained.

  As a resin pipe connection joint of this type, conventionally, as shown in FIG. 6, an engagement tooth portion 43 having a sawtooth cross section is provided on the outer peripheral surface of the connection cylinder portion 42 of the joint body 45 into which the resin pipe 44 is inserted. The engaging tooth portion 43 is formed and engaged with the inner peripheral surface of the resin tube 44 press-fitted into the connecting tube portion 42, thereby preventing the resin tube 44 from being removed and preventing water leakage. The made resin pipe connection joint 41 has been widely used (see, for example, Patent Document 1).

JP 2003-222282 A

  However, in the case of the conventional general resin pipe connection joint 41 as shown in FIG. 6, the engagement force of the engagement tooth portion 43 to the inner peripheral surface of the resin pipe 44 while ensuring the strength of the connection cylinder portion 42 sufficiently. In order to sufficiently secure the retaining force depending on the diameter, the engagement tooth portion 43 having a sawtooth cross section with a large diameter difference between the valley portion and the mountain portion is necessary, and the engagement tooth portion 43 is cut out. It must be formed by processing. Therefore, in the connected state, it is necessary to use a resin pipe 44 having an inner diameter D1 larger than necessary with respect to the inner diameter D2 of the connecting cylinder portion 42 which is an element for determining the allowable flow rate flowing through the pipe. There was a problem that disadvantages (uneconomical) in terms of the surface was inevitable.

  The present invention has been made in view of the above circumstances, and its purpose is to eliminate the use of a resin pipe having a diameter larger than necessary and to reduce the cost in practical use. An object of the present invention is to provide a resin pipe connection joint that can exert a strong retaining action and that can easily and reliably perform connection work in such a strong retaining state.

In order to achieve the above object, the resin pipe connection joint according to the present invention is engaged with the inner peripheral surface of the resin pipe in the connection cylinder portion of the joint body into which the resin pipe is inserted to prevent the resin pipe from being pulled out. An engagement tooth portion is provided, and a fastening ring that is fitted to the outside of the resin tube inserted into the connection tube portion and presses the inner peripheral surface of the resin tube toward the engagement tooth portion side is a joint. A resin pipe connection joint configured to be fastened and fixed to the joint body through a screw formed on an inner peripheral surface portion at one end in the axial direction so as to be screwed into a screw on the body side ,
The recessed portion provided on the outer peripheral surface side of the connecting tube portion is provided with a protruding member and an elastic member that elastically biases the protruding member toward the radially outer side, and the joint body and the fastening ring during the time that both screw is screwed a predetermined amount, the projecting member is a screw loosening of resiliently該締Me wheels engaged input to the recess in which the is formed on the inner peripheral surface portion following the screw of the clamping ring A return prevention mechanism is provided to prevent return in the direction,
An outer peripheral surface of the fastening ring from the recessed portion for engaging and releasing the protruding member elastically engaged with the recessed portion against the elasticity from the recessed portion by an operation from the outside of the fastening ring. is characterized in that slits for a tool pledged leading to is rather long formed in the circumferential direction.

  In the resin pipe connection joint having the above-described configuration, as described in claim 2, the engagement tooth portion is configured to be fitted and held in an annular recess formed on an outer peripheral surface of the connection tube portion of the joint body. desirable.

  According to the present invention having the above-described characteristic configuration, by pressing the inner peripheral surface of the resin tube against the engagement tooth portion by the fastening ring fitted to the outside of the resin tube, the valley portion and the mountain portion Even if an engagement tooth portion with a small diameter difference is used, it is possible to secure a sufficiently large retaining force depending on the engagement force, and the connection cylinder portion is not reduced by that much. The wall thickness can be reduced to reduce the outer diameter relative to the inner diameter. As a result, it is not necessary to use a resin pipe having an inner diameter larger than necessary with respect to the inner diameter of the connecting tube portion, and a practical cost can be reduced as compared with a conventional general resin pipe connecting joint.

  Moreover, even if the resin tube receives a diameter expansion deformation force due to a temperature change or the like, the fastening ring fitted to the outside of the resin tube is fastened and fixed to the joint body via the threaded portion. The engagement state of the engagement tooth portion can be secured and a strong retaining action can be exhibited.

  In addition, during the initial connection operation, when the threaded portion of the joint body and the fastening ring is screwed in a predetermined amount, the joint body-side protruding member that constitutes the return prevention mechanism is elasticated in the recess on the inner peripheral surface side of the fastening ring. Thus, the fastening ring can be prevented from returning in the direction of loosening the screw, and the tightening connection can be confirmed by a sound (click sound) generated when the protruding member is elastically engaged with the recess. Therefore, it is possible not only to eliminate variations in tightening during connection, but also to reliably and easily complete a tightening connection in a strong retaining state without requiring skill, and to ensure reliable connection workability and retaining performance. There is an effect that it is possible to achieve an improvement in performance.

  In particular, when adopting a configuration in which the engagement tooth portion is fitted and held in an annular recess formed on the outer peripheral surface of the connection cylinder portion, the inner diameter of the annular recess can be approximated to the outer diameter of the resin tube, and the connection is made accordingly. It is no longer necessary to reduce the inner diameter of the cylindrical portion, and it is possible to use a thinner resin tube, thereby further reducing the cost.

  Further, when forming a tool insertion hole in the fastening ring for engaging and releasing the protruding member elastically engaged with the concave portion of the inner peripheral surface of the fastening ring from the concave portion by an operation from the outside of the fastening ring. The return blocking mechanism has an irreversible configuration by increasing the engagement biasing force to the recess of the protruding member or increasing the engagement depth, and while further improving the reliability of the retaining performance, for example, resin When it is necessary to release the connection due to tube replacement or the like, by inserting a tool from the hole, the projecting member can be engaged and disengaged from the recess to release the predetermined connection.

Embodiments of the present invention will be described below.
FIG. 1 shows a resin pipe connection joint 1 used for connecting, for example, a resin pipe used as a hot water supply pipe or a water supply pipe in a house and a stop cock provided on the upstream side of a hot water introduction part of a hot water mixing plug. FIG. 2 is a half-longitudinal longitudinal sectional view showing a connection state. The resin pipe connection joint 1 is engaged with a joint body 12 having a connection cylinder portion 3 into which the resin pipe 2 is inserted and an inner peripheral surface 2a of the resin pipe 2; The resin tube 2 so as to press the engagement tooth portion 4 provided in the connecting tube portion 3 so as to prevent the resin tube 2 from being pulled out and the inner peripheral surface 2a of the resin tube 2 toward the engagement tooth portion 4 side. And a fastening ring 5 which can be fixed to the joint body 12 via male and female threaded portions A and B.

  As clearly shown in (A) and (B), the engaging tooth portion 4 has annular engaging teeth 7 having a sawtooth cross-sectional shape at a plurality of axial positions on the outer peripheral surface, and is provided in the circumferential direction. The joint body 12 is processed separately from the joint main body 12 by notching one place and expanding and contracting, and is fitted and held in a wide annular recess 6 formed on the outer peripheral surface 3a of the connection tube portion 3. ing. Then, when the engaging tooth portion 4 is fitted into the annular recess 6 in a state where the diameter of the engaging tooth 4 is deformed, the engaging tooth portion 4 is restored to its initial diameter by its own elasticity, and the engaging tooth 7 is connected to the connecting cylinder. It will be in the state which protruded to the diameter outer side from the outer peripheral surface 3a of the part 3. FIG.

  The joint body 12 can be tightened and connected to a stop cock provided on the opposite side of the connecting cylinder portion 3 with the large-diameter nut-like flange 9 as a boundary, for example, on the upstream side of the hot water introduction portion of the hot water mixing tap. A large male screw portion 8 is formed, the male screw A is formed between the nut-shaped flange 9 and the connecting tube portion 3, and a step 11 serving as an insertion limit stopper for the resin tube 2 is formed. It has a diameter-thick part 10. Further, the wide annular recess 6 and a plurality of narrow annular grooves 13 are formed on the outer peripheral surface of the connecting cylinder portion 3, and a seal such as an elastic O-ring is provided in the narrow annular groove 13. The ring 14 is fitted and held. When the resin tube 2 is inserted and inserted into the connecting tube portion 3, the engagement teeth 7 of the engagement tooth portion 4 bite into (engage with) the inner peripheral surface 2a of the resin tube 2 to prevent the resin tube 2 from coming off. At the same time, the plurality of seal rings 14 are brought into close contact with the inner peripheral surface 2a of the resin tube 2 and sealed in a watertight manner.

  In addition, the large-diameter thick-walled portion 10 of the joint body 12 is formed with a relatively deep recessed portion 19 in the radial direction so as to open to the outer peripheral surface, as clearly shown in FIG. In the insertion portion 19, there are a protruding member 15, an elastic member 16 such as a coil spring that elastically biases the protruding member 15 outward in the radial direction, and a ring stopper 20 that restricts the outward movement of the protruding member 15 in the radial direction. Contained and held. The projecting member 15 has a thin substantially semi-disc-shaped protrusion 15a and a substantially circular cross section that elastically contacts the ring stopper 20 so that only the substantially semi-disc-shaped protrusion 15a protrudes outward from the large-diameter thick-walled portion 10. And an arcuate stopper piece 15b.

On the other hand, as shown in FIGS. 3 and 4 , the fastening ring 5 is formed with a female screw A that is threadedly engaged with a male screw B on the joint body 12 side on the inner peripheral surface portion at one end in the axial direction. A cam surface 5a is formed on the inner peripheral surface portion adjacent to the female screw A to push the protruding member 15 radially inward against the biasing force of the elastic member 16, and the inner peripheral surface following the cam surface 5a. A shallow concave portion 17 into which the protruding portion 15a of the protruding member 15 is elastically engaged is formed in the portion. The recess 17 has a rectangular shape in plan view having an arc-shaped bottom surface 17a and an arc-shaped opening 17b, and the recess 17 and the protruding member 15 prevent the return of the fastening ring 5 in the screw loosening direction. A blocking mechanism is configured.

  Further, the projecting member 15 elastically engaged with the recess 17 is provided from the outside of the clamp ring 5 to the clamp ring wall portion from the center of the arcuate bottom surface 17 a of the recess 17 to the outer peripheral surface of the clamp ring 5. A slit hole 18 for inserting a tool for engaging and disengaging from the recess 17 against elasticity is formed by the above operation. The length along the circumferential direction of the slit hole 18 is set slightly shorter than the circumferential width of the recess 17.

  In the resin pipe connection joint 1 configured as described above, the engagement tooth portion 4 is fitted and held in the annular recess 6 of the outer peripheral surface 3a of the connection cylinder portion 3, so that the inner diameter of the annular recess 6 is set to the resin tube 2. Therefore, it is not necessary to reduce the inner diameter of the connecting tube portion 3 and the fluid flow rate corresponding to the inner diameter of the resin tube 2 can be secured. Accordingly, it is not necessary to use a resin pipe 44 having an inner diameter larger than necessary as compared with the conventional general resin pipe connection joint shown in FIG. 6, and the flow rate can be increased using the thin resin pipe 2.

  Further, after inserting and inserting the resin tube 2 into the connecting tube portion 3 of the joint body 12, the fastening ring 5 fitted to the outside of the resin tube 2 is inserted into the joint body 12 via the screwing of the male and female screw portions A and B. As shown in FIG. 2 (A), a predetermined pipe connection is performed by tightening and fixing. In the state immediately before the completion of tightening, which has a slight margin in the screwing amount of the male and female screw parts A and B at the time of the tightening connection work, The projection member 15 which is one component of the return prevention mechanism is pushed back inward in the radial direction against the urging force of the elastic member 16 by the cam surface 5a, and when it is screwed in a predetermined amount, FIG. B), the protruding member 15 is moved radially outward by the biasing force of the elastic member 16, and the protruding portion 15a of the protruding member 15 is elastically engaged with the concave portion 17 on the inner peripheral surface of the fastening ring 5. And thereby return the fastening ring 5 in the direction of loosening the screw. There together is prevented, the projection member 15 can be confirmed that the predetermined exactly clamping connection is completed by audible click that occurs (click sound) when the resilient enter the recess 17. Therefore, it is possible not only to eliminate variations in tightening at the time of connection, but also to securely and easily complete a tightening connection in a strong retaining state without requiring skill. An improvement in the reliability of the stopping performance can be achieved.

  When the tightening connection is completed, the inner peripheral surface 2a of the resin tube 2 is pressed and held by the engagement tooth portion 4 by the fastening ring 5 fitted to the outside of the resin tube 2. Even if the engagement tooth portion 4 having a small diameter difference between the head portion and the ridge portion is used, a sufficiently large retaining force depending on the engagement force is ensured and a highly reliable retaining performance is exhibited and maintained. Is possible.

  Further, when it is necessary to release the connection due to, for example, replacement of the resin tube 2 during use in the above-described tightened connection state, a tool such as a screwdriver is inserted through the slit hole 18 to A predetermined tightening connection can be released by operating the projecting portion 15a to be engaged and disengaged from the concave portion 17 and to loosen the fastening ring 5 from the joint body 12 via the screw portions A and B in this state.

  The protrusion member 15 may have a shape other than the one described in the above embodiment, for example, a pin shape or a ball shape, and the concave portion 17 has the shape of the protrusion member 15. What is necessary is just to make it the shape which match | combined.

It is a semi-longitudinal longitudinal sectional view showing an embodiment of a resin pipe connection joint according to the present invention. (A) It is a principal part expanded sectional view which shows the state immediately before completion of fastening of the fastening ring in the resin pipe connection joint which concerns on this invention, (B) It is a principal part expanded sectional view which shows the fastening completion state of the fastening ring. It is an external appearance perspective view for demonstrating the return prevention mechanism in the resin pipe connection joint which concerns on this invention. It is the XX sectional view taken on the line in FIG. (A) The half hook longitudinal cross-sectional view of the engagement tooth part in the resin pipe connection joint which concerns on this invention, (B) The front view of the engagement tooth part. It is a longitudinal cross-sectional view of the conventional general resin pipe connection joint.

DESCRIPTION OF SYMBOLS 1 Resin pipe connection joint 2 Resin pipe 2a Inner peripheral surface 3 Connection cylinder part 4 Engagement tooth part 5 Fastening ring 6 Annular recessed part 12 Joint main body 15 Projection member
16 Elastic member 17 Recess 18 Slit hole for tool insertion
19 recesses
Flip It A female
B male screw

Claims (2)

The connecting tube portion of the joint body into which the resin tube is inserted is provided with an engaging tooth portion that engages with the inner peripheral surface of the resin tube and prevents the resin tube from being inserted, and is inserted into the connecting tube portion. A fastening ring that is fitted to the outside of the resin tube and presses the inner peripheral surface of the resin tube toward the engaging tooth portion is formed on the inner peripheral surface portion at one end in the axial direction so as to be screwed into the screw on the joint body side. A resin pipe connection joint configured to be fastened and fixed to the joint body through the formed screw ,
The recessed portion provided on the outer peripheral surface side of the connecting tube portion is provided with a protruding member and an elastic member that elastically biases the protruding member toward the radially outer side, and the joint body and the fastening ring during the time that both screw is screwed a predetermined amount, the projecting member is a screw loosening of resiliently該締Me wheels engaged input to the recess in which the is formed on the inner peripheral surface portion following the screw of the clamping ring A return prevention mechanism is provided to prevent return in the direction,
An outer peripheral surface of the fastening ring from the recessed portion for engaging and releasing the protruding member elastically engaged with the recessed portion against the elasticity from the recessed portion by an operation from the outside of the fastening ring. resin pipe connection fitting, characterized in that the slit of the tool posting is long rather formed in the circumferential direction leading to.   The resin pipe connection joint according to claim 1, wherein the engagement tooth portion is fitted and held in an annular recess formed on an outer peripheral surface of a connection tube portion of the joint body.

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