JP2010210040A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a joint body from being cracked. <P>SOLUTION: In a pipe joint 10, a press-fitting member 34 is locked to the joint body 14 with the tip of a thin-walled part 34A pressed to a cover ring 30. The press-fitting member 34 thereby receives resilience from the cover ring 30, while the cover ring 30 is formed of a resin material of lower hardness than the press-fitting member 34 in this pipe joint 10, therefore the cover ring 30 is deformed by the pressing to suppress the deformation of the press-fitting member 34. The resilience received by the press-fitting member 34 from the cover ring 30 is thereby reduced, and in consequence, a load input to the locking portion between the press-fitting member 34 and the joint body 14 (an abutting portion between a protrusion 34B and a side face of a press-fitting groove 16A) is reduced. As a result, stress applied to the press-fitting groove 16A is reduced to prevent the joint body 14 from being cracked from the press-fitting groove 16A as a starting point. <P>COPYRIGHT: (C)2010,JPO&INPIT

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.

  In this sleeve, the convex portion provided on the outer peripheral portion is hooked on the side surface of the circumferential groove formed in the inner peripheral portion of the insertion hole, so that one end portion is attached to the ring member. It is pressed and slightly crushed. This eliminates the gaps between the components.

JP 2009-14166 A

  In the pipe joint as described above, when the one end of the sleeve is not sufficiently crushed, 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.

  In view of the above facts, the present invention has an object to obtain a pipe joint capable of preventing the joint body from being cracked.

  According to a first aspect of the present invention, there is provided a pipe joint including a joint main body having an insertion hole into which a pipe body is inserted, a first member accommodated in the insertion hole, and a hardness higher than that of the first member. And a second member that is received in the insertion hole and that is locked to the joint body while being pressed against the first member.

  In the pipe joint according to the first aspect, the second member is locked to the joint main body while being pressed against the first member. Since the second member is made of a material having higher hardness than the first member, the first member is deformed by pressing the second member against the first member, and the deformation of the second member is suppressed. . Thereby, since the repulsive force which a 2nd member receives from a 1st member can be made small, the stress which arises in the latching part of a 2nd member and a coupling main body can be made small. Thereby, it can prevent that a crack arises in a joint main part.

  A pipe joint according to a second aspect of the present invention is the pipe joint according to the first aspect, wherein the second member has a convex portion provided on an outer peripheral portion of the insertion hole. It is characterized by being hooked to the side surface of the groove formed in the peripheral portion to be locked to the joint body and having a curved surface between the side surface and the bottom surface of the groove.

  In the pipe joint according to claim 2, the convex part provided in the outer peripheral part of the 2nd member is caught in the side of the groove formed in the inner peripheral part of the insertion hole of a joint main part, and the 2nd member is a joint. Locked to the body. For this reason, the repulsive force which a 2nd member receives from a 1st member is input into the side surface of the groove | channel of a coupling main body via the convex part of a 2nd member. Here, since the space between the side surface and the bottom surface of the groove is formed in a curved surface, the stress generated between the two can be dispersed. Thereby, it can prevent much more that a crack arises in a joint main part.

  As described above, in the pipe joint according to the present invention, it is possible to prevent the joint body from being cracked.

It is sectional drawing which shows the partial structure of the pipe joint which concerns on 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 the expanded sectional view which expanded a part of pipe joint shown by FIG. It is an expanded sectional view corresponding to Drawing 3 showing the partial composition of the conventional pipe joint.

  Hereinafter, with reference to FIGS. 1-3, the pipe joint 10 which concerns on embodiment of this invention is demonstrated. The pipe joint 10 according to the present embodiment is a pipe joint for connecting a beer hose 12 (pipe body) for transferring beer, and includes a joint body 14 as shown in FIGS. 1 and 2. (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. The inside of 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 a step portion between the large diameter portion 20 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 (first member) formed in a ring shape from 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. .

  Further, a press-fitting member 34 (second member) formed in a cylindrical shape by a resin material harder than the cover ring 30 is provided inside the large diameter portion 20. The hardness of the cover ring 30 and the press-fitting member 34 can be compared by Vickers hardness.

  The press-fitting member 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 coaxially fitted inside the large-diameter portion 20. The press-fitting member 34 has an inner diameter dimension that is increased 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.

  Further, a convex portion 34 </ b> B having a substantially trapezoidal cross section is provided on the outer peripheral portion of the press-fitting member 34. The convex portion 34B is fitted into a press-fit groove 16A (circumferential groove) formed in the inner peripheral portion of the large diameter portion 20. As shown in FIG. 3, the press-fitting groove 16 </ b> A has a substantially trapezoidal cross section, and has a bottom surface 36 that faces the radially inner side of the hose connecting portion 16 and a side surface that faces the axial direction of the hose connecting portion 16. 38, 40. Further, in this press-fit groove 16A, a curved surface portion 42 between the one side surface 38 (the side surface on the opening side of the insertion hole 18 and the left side surface in FIGS. 1 to 3) and the bottom surface 36 is formed as a curved surface. .

  The convex portion 34B fitted in the press-fitting groove 16A is hooked (abuts) on the one side surface 38. Thereby, the press-fitting member 34 is locked to the joint body 14 in a state where the tip of the thin portion 34 </ b> A (see FIGS. 1 and 2) is pressed against the cover ring 30. That is, the press-fitting member 34 is long so that the convex portion 34B does not fit into the press-fitting groove 16A unless it is further press-fitted into the insertion hole 18 from the state where the tip of the thin portion 34A is in contact with the cover ring 30. The dimension is set. For this reason, in the locked state, the convex portion 34 </ b> B is pressed against the side surface 38 by the repulsive force that the press-fitting member 34 receives from the cover ring 30. Further, the cover ring 30 is held so as not to be displaceable between the step portion 32 in the insertion hole 18 and the press-fit member 34, and the cover ring 30 and the step portion 32 are in close contact with each other with no gap, and the press-fit member 34. And the cover ring 30 are in close contact with each other without a gap.

  On the other hand, inside the thin portion 34A of the press-fitting member 34, a lock claw 44 formed in a ring shape by a metal material having a spring property is coaxially disposed. The lock claw 44 is held between the press-fitting member 34 and the cover ring 30 so as not to be displaced in the axial direction. The lock claw 44 has a substantially V-shaped cross section, and can be expanded in diameter 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.

  A release ring 46 for bending the lock claw 44 is provided inside the press-fitting member 34. The release ring 46 is formed in a thin cylindrical shape and is coaxially fitted inside the press-fit member 34. The release ring 46 can be moved relative to the press-fit member 34 in the axial direction within a predetermined range, and is pushed into the other end in the axial direction of the press-fit member 34 by a special tool (not shown). . When the release ring 46 is pushed into the other end in the axial direction of the press-fitting member 34, the end in the axial direction of the release ring 46 comes into sliding contact with the inclination of the inner peripheral portion of the lock claw 44. It has come to expand. 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, an opening on one end side in the axial direction of the press-fitting member 34 (left side in FIG. 1) is an insertion port 48 for inserting the beer hose 12.

  Next, the operation and effect of this embodiment will be described.

  In the pipe joint 10 having the above 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 inserted into the insertion hole while the outer peripheral surface of the beer hose 12 is in sliding contact with the lock claw 44. 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 step portion between the small diameter portion 24 and the flow path 26, the beer hose 12 cannot be inserted any more, and the beer 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 is slightly moved to the insertion port 48 side in response to a force in the direction of pulling out from the pipe joint 10, 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 press-fitting member 34 and the outer peripheral surface of the beer hose 12, and the release ring 46 is connected to the back of the pipe joint 10. Push to the side. 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.

  Here, in the pipe joint 10 according to the present embodiment, the press-fitting member 34 is locked to the joint body 14 in a state where the tip of the thin portion 34A is pressed against the cover ring 30. For this reason, the press-fit member 34 receives a repulsive force from the cover ring 30 (see arrow F in FIG. 3), but in this embodiment, the cover ring 30 is formed of a resin material having a lower hardness than the press-fit member 34. Therefore, the cover ring 30 is deformed (collapsed) by the above-described pressing, and deformation of the press-fitting member 34 is suppressed. As a result, the repulsive force that the press-fitting member 34 receives from the cover ring 30 is reduced. The input load 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.

  In addition, in the present embodiment, as shown in FIG. 3, a curved curved surface portion 42 is formed between the side surface 38 and the bottom surface 36 of the press-fit groove 16 </ b> A. Therefore, unlike the conventional product (comparative example) shown in FIG. 4, the stress is not concentrated on the corner portion 50 between the side surface 38 and the bottom surface 36, and the stress applied between the side surface 38 and the bottom surface 36. Are dispersed by the curved surface portion 42. Therefore, it is possible to more effectively prevent the joint body 14 from being cracked.

  In addition, although the said embodiment demonstrated the case where this invention was applied with respect to the pipe joint 10 for connecting the beer hose 12 for beer transfer, not only this but this invention is a press-fitting member (2nd A pipe joint having a configuration in which the member is locked to the joint body in a state where the member is pressed against the cover ring (first member) can be applied.

  In the above embodiment, the curved curved surface portion 42 is provided between the side surface 38 and the bottom surface 36 of the press-fit groove 16A. However, the present invention is not limited to this, and the curved surface portion 42 is omitted. A configuration (a configuration in which the corner portion 50 is provided between the side surface 38 and the bottom surface 36) may be employed. Even in this case, it is possible to prevent the joint body 14 from being cracked by forming the cover ring 30 with a material having a hardness lower than that of the press-fitting member.

  The present invention has been described with reference to the embodiment. However, the above embodiment is merely an example, 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)
16 Joint body 16A Press-fit groove (groove)
30 Covering (first member)
34 Press-fit member (second member)
34B Convex part 36 Bottom 38 Side

Claims (2)

A joint body in which an insertion hole into which the tubular body is inserted is formed;
A first member housed in the insertion hole;
A second member that is formed of a material harder than the first member, is housed in the insertion hole, and is locked to the joint body in a state of being pressed against the first member;
With pipe fittings.   The second member is locked to the joint body by a convex portion provided on the outer peripheral portion being hooked on a side surface of the groove formed on the inner peripheral portion of the insertion hole, and the side surface and the groove The pipe joint according to claim 1, wherein a space between the bottom surface and the bottom surface is formed in a curved shape.

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