JP5538932B2 - Pipe fitting - Google Patents

Description

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

  Conventionally, a pipe joint that can connect a pipe body (hose) with one touch is known (for example, see Patent Document 1). This pipe joint includes a joint body in which an insertion hole into which a pipe body is inserted is formed. A seal member that is in close contact with the outer peripheral surface of the tube body is provided on the back side of the insertion hole, and a ring member (cover ring) for holding the seal member on the joint body is provided on the front side of the seal member. Is provided. In addition, a lock claw that is caught on the outer peripheral surface of the pipe body is provided on the front side of the ring member, and a sleeve (press-fit) for holding the lock claw and the ring member on the joint body is provided on the front side of the lock claw. Member) is inserted.

JP 2007-177985 A

  However, in the pipe joint of Patent Document 1, the convex portion provided on the outer peripheral portion of the sleeve is hooked on the side surface of the circumferential groove formed on the inner peripheral portion of the insertion hole, thereby being locked to the joint body. One end is pressed against the ring member. For this reason, the sleeve may receive a large repulsive force from the ring member. Since this repulsive force is input to the side surface of the circumferential groove of the joint body through the convex portion of the sleeve, stress concentrates on the corner between the side surface and the bottom surface of the circumferential groove, and the corner is the starting point. The joint body could crack.

  The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a pipe joint capable of preventing the joint body from being cracked.

The pipe joint of the invention according to claim 1 is a joint body in which an insertion hole into which a pipe body is inserted is formed, a water stop member provided at the bottom of the insertion hole and in contact with the outer peripheral surface of the pipe body, A cover ring that is housed in the insertion hole and prevents the water stop member from coming out of the insertion hole; and a lock claw that is provided on the opening side of the insertion hole with respect to the cover ring and grips the tubular body. The convex portion provided in the outer peripheral portion is inserted into the insertion hole from the distal end portion, and is press-fitted into a groove formed in the inner peripheral portion of the insertion hole. It is locked and prevents the cover ring and the lock claw from coming out of the insertion hole , and the convex portion is on the opposite side of the groove in a state where it abuts the side surface of the groove on the opening side of the insertion hole. And the tip is also not in contact with the side surface Having a press-fitting member in a state spaced between the serial covering.

In the pipe joint according to claim 1, when the press-fitting member is inserted into the insertion hole of the joint body from the distal end portion, the convex portion provided on the outer peripheral portion is press-fitted into the groove formed in the inner peripheral portion of the insertion hole. After press-fitting, the joint body is locked by being caught in the groove, and the cover ring and the lock claw are prevented from coming out of the insertion hole. In addition, when the convex portion is in contact with the opening side surface of the groove insertion hole, it is not in contact with the opposite side surface of the groove, and the tip of the press-fitting member is also spaced from the cover ring. It is assumed that For this reason, the stress which arises in the latching part of a press-fit member and a coupling main body at the time of press-fit can be made small. As a result, the joint body can be prevented from cracking.

  A pipe joint according to a second aspect of the present invention is characterized in that a distance between the press-fitting member and the cover ring is greater than 0 mm and not greater than 0.3 mm.

  When the distance between the press-fitting member and the cover ring is 0 mm or less, the press-fitting member receives a repulsive force from the cover ring, so that the joint body may be cracked. On the other hand, if the interval between the press-fitting member and the cover ring is larger than 0.3 mm, it causes water leakage.

  As described above, the pipe joint according to the first aspect of the present invention can prevent the joint body from cracking.

The pipe joint according to claim 2 can prevent the joint body from being cracked and prevent water leakage.
It is sectional drawing which shows the partial structure of the pipe joint which concerns on one Embodiment of this invention. It is sectional drawing which shows the state by which the beer hose was connected to the pipe joint shown by FIG. It is explanatory drawing which shows the relationship between the position of a press-fit member and a cover ring, and a destructive pressure.

  A pipe joint according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is a cross-sectional view showing a partial configuration of a pipe joint according to an embodiment of the present invention, and FIG. 2 is a cross-section showing a state in which a beer hose is connected to the pipe joint shown in FIG. FIG.

  As shown in FIG.1 and FIG.2, the pipe joint 10 which concerns on this embodiment is a pipe joint for connecting the beer hose 12 as a pipe body for transferring beer, and is provided with the joint main body 14. As shown in FIG. (Note that only a part of the joint body 14 is shown in FIGS. 1 and 2). The joint body 14 is formed of a resin material and has a cylindrical hose connection portion 16. Inside the hose connecting portion 16 is an insertion hole 18 into which the beer hose 12 is inserted.

  The inner peripheral portion of the insertion hole 18 is formed in a stepped shape having a plurality of steps, and one end side in the axial direction (left side in FIGS. 1 and 2) is a large diameter portion 20. The large-diameter portion 20 is open at one end in the axial direction, and the medium-diameter portion 22 having a smaller diameter than the large-diameter portion 20 is formed at the other axial end of the large-diameter portion 20 (right side in FIGS. 1 and 2). Is provided. Further, a small diameter portion 24 having a smaller diameter than the medium diameter portion 22 is provided on the other axial end side of the medium diameter portion 22 (on the right side in FIGS. 1 and 2). A flow path 26 having a diameter smaller than that of the small diameter portion 24 is provided (on the right side in FIGS. 1 and 2). In addition, the inner diameter dimension of the small diameter part 24 is formed slightly larger than the outer diameter dimension of the beer hose 12.

  A seal member 28 formed in a ring shape with a rubber material is coaxially fitted inside the middle diameter portion 22. The seal member 28 is limited in displacement to the other side in the axial direction (right side in FIGS. 1 and 2) by the step portion 25 between the medium diameter portion 22 and the small diameter portion 24. The seal member 28 is in close contact with the outer peripheral surface of the beer hose 12 inserted into the insertion hole 18 and seals between the beer hose 12 and the joint body 14.

  On the other hand, a cover ring 30 formed in a ring shape with a resin material is accommodated inside the large diameter portion 20. The cover ring 30 is coaxially fitted inside the large-diameter portion 20 and is disposed in contact with the stepped portion 32 between the large-diameter portion 20 and the medium-diameter portion 22. The inner diameter dimension of the cover ring 30 is smaller than the inner diameter dimension of the medium diameter portion 22, and the seal member 28 is restricted from being displaced to one side in the axial direction (left side in FIG. 1) by the cover ring 30. . Furthermore, a sleeve 34 as a press-fitting member formed in a cylindrical shape is provided inside the large diameter portion 20.

  The sleeve 34 is disposed on the opening side (left side in FIG. 1) of the insertion hole 18 with respect to the cover ring 30, and is fitted coaxially inside the large diameter portion 20. The sleeve 34 has an inner diameter dimension that increases in a tapered shape on the other end side in the axial direction (right side in FIGS. 1 and 2), and the other end in the axial direction is a thin portion 34A.

  On the other hand, on the inner side of the thin portion 34A of the sleeve 34 which is the opening side in the insertion hole 18 with respect to the cover ring 30, a lock claw 44 formed in a ring shape by a metal material having spring properties is coaxially disposed. ing. The lock claw 44 is formed in a substantially V-shaped cross section, and the inner diameter can be increased by bending and deforming. The inner diameter dimension of the lock claw 44 in the natural state is slightly smaller than the outer diameter dimension of the beer hose 12. Further, when the beer hose 12 is pulled, the lock claw 44 is retracted along the taper surface of the sleeve 34, and the lock claw 44 bites into the beer hose 12 and chucks (locks) by the wedge effect.

  A convex portion 34 </ b> D having a substantially trapezoidal cross section is provided on the outer peripheral portion of the sleeve 34. This convex portion 34 </ b> D is fitted into a press-fit groove 16 </ b> A (circumferential groove) formed in the inner peripheral portion of the large-diameter portion 20.

  The sleeve 34 is press-fitted with a predetermined interval W1 between the sleeve 34 and the cover ring 30, and the interval W1 between the sleeve 34 and the cover ring 30 is greater than 0 mm and equal to or less than 0.3 mm.

  This is because, when the interval W1 between the sleeve 34 and the cover ring 30 is 0 mm or less, the sleeve 34 receives a repulsive force from the cover ring 30, so that the press-fit groove 16A of the hose connecting portion 16 may be cracked. Further, when the interval W1 between the sleeve 34 and the cover ring 30 is 0 mm or less, when the sleeve 34 is press-fitted into the large-diameter portion 20 of the joint body 14, the distal end portion 34B of the sleeve 34 hits (or bites) the cover ring 30. As a result, it is necessary to press-fit the sleeve 34 into the large-diameter portion 20 of the joint body 14 while taking care not to break the lock claw 44 between the sleeve 34 and the cover ring 30 by the sleeve 34. On the other hand, if the interval W1 between the sleeve 34 and the cover ring 30 is larger than 0.3 mm, it causes water leakage.

  Accordingly, the sleeve 34 is press-fitted into the joint main body 14 with the distal end 34B of the thin-walled portion 34A (see FIGS. 1 and 2) spaced from the cover ring 30. That is, if the sleeve 34 is not press-fitted into the insertion hole 18 until the tip 34B of the thin-walled portion 34A is spaced from the cover ring 30 by a distance W1, the convex portion 34D is fitted into the press-fit groove 16A. The length dimension is set so that there is no.

  In the locked state, the cover ring 30 is held between the step portion 32 in the insertion hole 18 and the sleeve 34.

  A release ring 46 for bending the lock claw 44 is provided inside the sleeve 34. The release ring 46 is formed in a thin cylindrical shape, and is coaxially fitted inside the sleeve 34. The release ring 46 can be moved relative to the sleeve 34 in the axial direction within a predetermined range, and is pushed to the other end in the axial direction of the sleeve 34 by a special tool (not shown). When the release ring 46 is pushed into the other axial end of the sleeve 34, the axial end of the release ring 46 comes into sliding contact with the inclination of the inner peripheral portion of the lock claw 44, thereby increasing the inner diameter of the lock claw 44. It is supposed to be. The inner diameter dimension of the release ring 46 is slightly larger than the inner diameter dimension of the beer hose 12.

  In the pipe joint 10 having the above-described configuration, the opening on the axial direction one end side (left side in FIG. 1) of the sleeve 34 is an insertion port 48 for inserting the beer hose 12.

(Function and effect)
Next, the operation and effect of this embodiment will be described.
In the pipe joint 10 having the above-described configuration, the sleeve 34 is press-fitted into the joint main body 14 with a space W1 between the tip 34B of the thin portion 34A of the sleeve 34 and the cover ring 30. That is, the sleeve 34 is press-fitted into the joint body 14 in a state where the tip 34B of the thin portion 34A of the sleeve 34 is not pressed against the cover ring 30, and the sleeve 34 does not receive a repulsive force from the cover ring 30. For this reason, the load input to the latching part (contact part of convex part 34D and press-fit groove 16A) of the sleeve 34 and the coupling main body 14 is reduced. Thereby, since the stress applied to the press-fit groove 16A is reduced, it is possible to prevent the joint body 14 from being cracked starting from the press-fit groove 16A.

  Further, in the pipe joint 10 having the above-described configuration, the sleeve 34 is press-fitted into the joint body 14 with a gap W1 between the tip 34B of the thin portion 34A of the sleeve 34 and the cover ring 30. For this reason, in assembling the pipe joint 10, when the sleeve 34 is press-fitted into the joint body 14, the tip 34 </ b> B of the sleeve 34 does not hit or bite into the cover ring 30. As a result, it is not necessary to perform the assembling work with care so that the lock claw 44 between the sleeve 34 and the cover ring 30 is not broken by the sleeve 34, and the assembling workability can be improved.

  In addition, when the beer hose 12 is inserted, a space is ensured for the lock claw 44 that is expanded in diameter when the beer hose is inserted, since there is a gap between the sleeve 34 and the cover ring 30. The lock claw 44 is easily expanded in diameter, and the insertion resistance of the beer hose 12 is not increased. For this reason, connection of beer hose 12 becomes easy.

  In the present embodiment, the interval W1 between the sleeve 34 and the cover ring 30 is greater than 0 mm. For this reason, it is possible to prevent the joint body 14 from being cracked starting from the press-fit groove 16A, and when the sleeve 34 is press-fitted into the large-diameter portion 20 of the joint body 14, the tip portion 34B of the sleeve 34 hits the cover ring 30. Alternatively, it is possible to prevent the lock pawl 44 from being broken by the sleeve 34. Moreover, since the interval W1 between the sleeve 34 and the cover ring 30 is 0.3 mm or less, it is possible to prevent the gap between the sleeve 34 and the cover ring 30 from causing water leakage.

  As shown in FIG. 3, when transporting a low-pressure fluid (for example, 0.4 MPa or less) such as beer, 4.0 MPa (safety) when the interval W1 between the sleeve 34 and the cover ring 30 is 0.3 mm or less. A breaking (hose burst) pressure of 10) is ensured. On the other hand, when the interval W1 between the sleeve 34 and the cover ring 30 exceeds 0.3 mm, water leakage occurs at a breaking pressure of 3.8 to 3.9 MPa.

  Further, in the pipe joint 10 having the above-described configuration, when one end in the longitudinal direction of the beer hose 12 is inserted into the insertion hole 18 from the insertion port 48, the beer hose 12 is slid while the outer peripheral surface of the beer hose 12 is in sliding contact with the lock claw 44. The insertion hole 18 is inserted into the back side (right side in FIGS. 1 and 2). As shown in FIG. 2, when one end of the beer hose 12 comes into contact with the stepped portion 50 between the small diameter portion 24 and the flow path 26, the beer hose 12 cannot be inserted any more, and the beer The hose 12 is connected to the pipe joint 10.

  In this state, the seal member 28 is in close contact with the outer peripheral surface of the beer hose so that the space between the beer hose 12 and the pipe joint 10 is sealed. Further, the inner peripheral side end of the lock claw 44 is caught on the outer peripheral surface of the beer hose 12, so that the beer hose 12 is prevented from being detached from the pipe joint 10. In this state, when a liquid (beer) flows into the beer hose 12 and an internal pressure is applied, the beer hose 12 receives a force in the direction of pulling out from the pipe joint 10 and slightly moves to the insertion port 48 side. The peripheral end bites into the outer peripheral surface of the beer hose 12. Thereby, the gripping force of the beer hose 12 by the lock claw 44 is increased, and the pipe joint 10 and the beer hose 12 are firmly connected.

  On the other hand, when removing the beer hose 12 from the pipe joint 10, a special tool (not shown) is inserted between the inner peripheral surface of the sleeve 34 and the outer peripheral surface of the beer hose 12, and the release ring 46 is connected to the inner side of the pipe joint 10. Push into. The release ring 46 pushed into the inner side of the pipe joint 10 is in sliding contact with the slope of the inner peripheral portion of the lock claw 44 and bends the inner peripheral portion of the lock claw 44 in the diameter increasing direction. Thereby, the hook of the lock claw 44 with respect to the outer peripheral surface of the beer hose 12 is released, and the beer hose 12 can be detached from the pipe joint 10.

  In addition, when it is set as the structure without the cover ring 30 as disclosed by Unexamined-Japanese-Patent No. 2006-105285, it is necessary to cut the groove | channel which hold | maintains the sealing member 28 in the inner peripheral part of the coupling main body 14. Although it has been difficult to confirm the processing of the groove and the processing accuracy, this embodiment can also improve this point.

  In addition, in the said embodiment, although the case where this invention was applied with respect to the pipe joint 10 for connecting the beer hose 12 for beer transfer was demonstrated, not only this but this invention is a water stop member, Any other types of pipe joints having cover rings, lock claws and sleeves can be applied.

  The present invention has been described with reference to the embodiment. However, the above embodiment is an example of the present invention, and various modifications can be made without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiment.

10 Pipe Fitting 12 Beer Hose (Tube)
14 Joint body 16 Hose connecting part 16A Press-fit groove 28 Seal member 30 Cover ring 32 Step part 34 Sleeve (Press-fit member)
34A Thin portion of sleeve 34B Tip of sleeve 34C Inner peripheral portion of sleeve tip 34D Convex portion of sleeve 44 Lock claw

Claims (2)

A joint body in which an insertion hole into which the tubular body is inserted is formed;
A water stop member provided at the bottom of the insertion hole and in contact with the outer peripheral surface of the tubular body;
A cover ring that is accommodated in the insertion hole and prevents the water stop member from coming out of the insertion hole;
A lock claw that is provided on the opening side in the insertion hole with respect to the cover ring and grips the tubular body;
A convex portion provided on the outer peripheral portion is inserted into the insertion hole from the tip , and is press-fitted into a groove formed in the inner peripheral portion of the insertion hole. The cover ring and the locking claw are prevented from coming out of the insertion hole , and the convex portion is on the opposite side of the groove when in contact with the opening side surface of the insertion hole. A press-fitting member that is not in contact with a side surface, and that the tip portion is also in a state of being spaced from the cover ring ;
Pipe fittings with   The pipe joint according to claim 1, wherein a distance between the press-fitting member and the cover ring is greater than 0 mm and equal to or less than 0.3 mm.

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