JP2011112066A - Cap for female type pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap capable of preventing fatigue fracture of a valve member inside of a female type pipe joint due to application of the fluid pressure inside of the female type pipe joint removed from a male type pipe joint. <P>SOLUTION: This cap includes: a cylindrical part (42) to be inserted into an opening part (14) of a female type pipe joint (10); and a valve member receiving recessed part (48). The cylindrical part (42) pushes a sliding valve member (28) of the female type pipe joint, and the valve member receiving recessed part (48) receives a valve seat part (26) of a fixed valve member (24) of the female type pipe joint. The valve member receiving recessed part (48) receives the fluid pressure inside of a fluid passage (18) of the female type pipe joint (10) in a part deeper than the valve seat part (26) of the fixed valve member (24). The fluid pressure received in the back part pushes the valve seat part (26) of the fixed valve member (24) in the axial direction thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe joint, and more particularly to a cap attached to a female pipe joint in a state separated from a male pipe joint.

  There are known protective caps for attaching caps to the distal ends of the separated male and female pipe joints to prevent the tip parts from being damaged and debris from entering the pipe joints. (For example, see Patent Document 1).

Japanese Utility Model Sho 63-110791

  In male and female pipe fittings that are provided with valves to prevent internal fluid from leaking in a separated state, the fluid device to which the pipe fitting is connected is subjected to varying fluid pressure. . When such a varying fluid pressure is applied, the valve is subject to fatigue failure, and the valve may jump out of the pipe joint due to the fluid pressure.

  In view of such a point, the present invention provides a cap for a pipe joint having a function for preventing fatigue failure even when the valve is subjected to repeated pressure as described above, particularly for a female pipe joint. The purpose is to provide a cap.

The female pipe coupling cap according to the present invention is:
The first open end to which the pressurized fluid pipe is connected (in the description of the embodiment described below, it is indicated by reference numeral 12 and the same indication is given below), and the male pipe joint is removable. A female pipe fitting cap (40) attached to the second open end (14) of a female pipe joint (10) having a second open end (14) to be inserted and connected,
A tubular portion (42) inserted into the second open end (14) of the female pipe joint (10);
Delimited by the tubular portion (42) and faces the second open end when the female pipe fitting cap (40) is attached to the second open end of the female pipe joint (10). A valve member receiving recess (48) extending in a direction away from the second opening end from the opened opening (48b),
When the cylindrical part (42) is inserted into the female pipe joint (10), a locking part locked to the female pipe joint (in the same embodiment, a spherical locker of the female pipe joint) And the locking recess 44 to be fitted)
The cylindrical portion (42) is slidably set to the female pipe joint (10) when inserted into the female pipe joint (10) through the second open end (14). A valve seat portion (26) of a fixed valve member (24) fixed to the female pipe joint (10) by engaging the valve member (28) and pushing the slide valve member (28). The valve seat portion (26) of the fixed valve member (24) that has closed the fluid passage (18) by sealingly engaging with the slide valve member (28) on the radially inner side of the slide valve member (28). Is received in the valve member receiving recess (48),
In the valve member receiving recess (48), the tubular part (42) is inserted into the female pipe joint (10), and the female pipe joint cap (40) is inserted through the locking part (44). When the female pipe joint (10) is locked, the fixed valve member that has received the fluid pressure in the fluid passage (18) of the female pipe joint (10) in the valve member receiving recess (48). The fluid pressure received in the back of the valve member receiving recess (48) from the valve seat (26) of (24) and received in the back of the valve seat (26) of the fixed valve member (24). ) To the first open end (12) of the female pipe joint (10).

  In this female pipe joint cap, when the female pipe joint is mounted, the fluid pressure in the fluid passage of the female pipe joint is received in the back of the valve member receiving recess (48) and fixed. The valve seat (26) is directed toward the valve opening (26) toward the first open end (12) of the female pipe joint (10). Since fluid pressure is applied from both sides in the direction, it is possible to prevent the fatigue failure as described above from occurring in the valve seat portion.

  Specifically, the inner peripheral wall surface (48a) of the valve member receiving recess (48) is the valve seat portion (26) of the fixed valve member (24) received in the valve member receiving recess (48). And a fluid pressure in the fluid passage (18) of the female pipe joint (10) is received in the inner part of the valve member receiving recess (48) through the gap. Can be made.

  In this case, the cylindrical portion (42) has an annular seal member (43) that is sealingly engaged with the sliding valve member (28) when the sliding valve member (28) is pushed in. Can do.

  As another form, the valve member receiving recess (48) extends coaxially with the inner peripheral wall surface (48a) via a gap (G), and the tubular portion (42) is female. When inserted into the mold pipe joint (10), the fluid passage (18) of the female pipe joint (10) and the inner part of the valve member receiving recess (48) are connected via the gap (G). A sleeve (60) adapted to communicate with the sleeve; and a pressing member (62) that is hermetically engaged with the sleeve and slidable within the sleeve, wherein the tubular portion (42) is the female tube. The sleeve (60) is slid in sealing engagement with the valve seat (26) of the stationary valve member (24) when inserted into the second open end (14) of the joint (10); When the tubular portion is inserted into the female pipe joint, the fluid pressure in the fluid passage of the female pipe joint is received by the inner part of the valve member receiving recess through the gap. Can be made to be applied to the stationary valve member (24) via the pressing member (62) is provided.

In this case, the valve member receiving recess (48) is a through-hole (communication from the back of the valve member receiving recess to the outside of the female pipe fitting cap (40) along the axis of the valve member receiving recess). 48b), the pressing member (62) is hermetically engaged with the peripheral wall of the through hole (48b) and is slidable. Further, the pressing member (62) is provided on the fixed valve member (24). A surface (62a) pressed against the valve seat portion (26), and an atmosphere extending from the surface (62a) through the pressing member (62) along the axis of the valve member receiving recess (48) and communicating with the atmosphere. It can be made to have a communicating hole (62b).
Hereinafter, an embodiment of a female pipe coupling cap according to the present invention will be described with reference to the accompanying drawings.

It is a side view which shows the female pipe joint and the cap for female pipe joints which concerns on 1st Embodiment of this invention before mounting | wearing with this female pipe joint, and shows an upper half part with a cross section. It is the side view which made the cross section the upper half part which shows the state with which the cap for female pipe couplings of FIG. 1 was mounted | worn with the female pipe coupling. It is a side view which shows the female pipe joint and the cap for female pipe joints concerning 2nd Embodiment of this invention before mounting | wearing with this female pipe joint, and shows an upper half part with a cross section. FIG. 4 is a side view in cross section of the upper half portion showing a state in which the female pipe coupling cap of FIG. 3 is attached to the female pipe coupling.

  In the illustrated example, the female pipe joint 10 to which the cap for the female pipe joint according to the present invention is attached is not illustrated with the first opening end 12 on the left side as viewed in the drawing to which a pressurized fluid pipe (not shown) is connected. A tubular joint body 16 having a second open end 14 to which a male pipe joint is detachably connected is provided. The joint body has a fluid passage 18 that extends in the axial direction and communicates the first open end 12 and the second open end 14. Specifically, the joint body 16 includes a first tubular body 16a that defines the first opening end 12, a second tubular body 16b that is screw-coupled to the first tubular body, and first and second parts. And a third cylindrical body 16c sandwiched between the cylindrical bodies.

  The joint body 16 is provided with a fixed valve member 24 extending along the longitudinal axis thereof. Specifically, the fixed valve member is connected to the joint body 16 by a radial connecting portion 22 in which a plurality of axial through holes 20 are provided at intervals in the circumferential direction. A valve seat portion 26 that has an enlarged large diameter and that defines an annular fluid passage between the inner peripheral wall surface of the second opening end 14 in the joint body 16 is provided.

  A cylindrical slide valve member 28 is hermetically engaged and slidable on the peripheral surface of the valve seat portion 26. Specifically, the sliding valve member is slidable on the first cylindrical valve body 28a that is slidably engaged with the peripheral surface of the valve seat portion 26 and on the outer peripheral surface of the first cylindrical valve body. The second cylindrical valve body 28b is slidable on the inner peripheral surface of the second opening end 14 of the joint body 16. When a male pipe joint (not shown) is inserted into the second opening end 14, the second tubular valve body 28b is pushed by the male pipe joint, and the second tubular valve body 28b is moved to the first tubular valve. When the step 28c of the body 28a is engaged, the first cylindrical valve body 28a is pushed together with the second cylindrical valve body 28b, and is separated from the valve seat portion 26 of the fixed valve member 24, and the female mold The fluid passage 18 of the pipe joint 10 is communicated with the fluid passage of the male pipe joint.

  A female pipe joint cap 40 according to the first embodiment shown in FIGS. 1 and 2 includes a cylindrical part 42 inserted into the second opening end 14 of the female pipe joint 10, and the cylindrical part 42. The valve member receiving recess 48 defined by the above-mentioned, in a direction away from the second opening end from the opening 48b facing the second opening end 14 of the female pipe joint 10 when the female pipe joint 10 is mounted. When the extending valve member receiving recess 48 and the cylindrical portion 42 are inserted into the female pipe joint 10, the spherical lock 30 provided on the female pipe joint 10 is engaged with the female mold. And a locking portion 44 formed as an annular groove for locking the pipe joint cap 40 to the female pipe joint 10. A locking sleeve 32 is attached to the female pipe joint 10, and the spherical locking element 30 is pressed by the locking sleeve 32 while being engaged with the locking portion 44.

  The cylindrical portion 42 is adapted to push the sliding valve member 28 toward the first opening end 12 when inserted into the second opening end 14 of the female pipe joint 10. As in the case of the male pipe joint, the distal end surface 42a of the cylindrical portion 42 is engaged with and pushed into the second cylindrical valve body 28b of the sliding valve member, and the second cylindrical valve body 28b is When it comes to engage with the stepped portion 28c of the one cylindrical valve body 28a, the first and second cylindrical valve bodies 28a and 28b are pushed together so that the sliding valve member 28 becomes the valve seat portion of the fixed valve member 24. 26. In this state, the annular seal member 43 provided on the inner peripheral surface of the cylindrical portion 42 of the female pipe joint cap 40 is sealingly engaged with the outer peripheral surface of the first cylindrical valve body 28a, and the first cylindrical shape is formed. Together with the annular seal member 29 attached to the valve body 28a, the fluid passage 18 of the female pipe joint 10 is sealed from the outside air.

  The valve member receiving recess 48 of the cylindrical portion 42 is configured such that the cylindrical portion 42 is inserted into the female pipe joint 10, and the female pipe joint cap 40 is connected to the female pipe joint 10 via the locking portion 44. When locked (FIG. 2), the valve member receiving recess is more than the valve seat portion 26 of the fixed valve member 24 that receives the fluid pressure in the fluid passage 18 of the female pipe joint 10 into the valve member receiving recess 48. The fluid pressure received on the back side of 48 is applied to the valve seat portion 26 of the fixed valve member 24 toward the first opening end 12 of the female pipe joint 10. ing. In the illustrated example, the inner peripheral wall surface 48 a of the valve member receiving recess 48 has an inner diameter slightly larger than the diameter of the valve seat portion 26 of the fixed valve member 24, and a gap G is formed between the valve seat portion 26 and the valve seat portion 26. The fluid pressure of the fluid passage 18 is applied to the end face of the fixed valve member. In the illustrated example, an annular seal ring 24b is provided on the peripheral surface of the valve seat portion 26 of the fixed valve member 24 so as to be in sealing engagement with the inner peripheral surface of the first tubular valve body 28a of the sliding valve member 28. However, the inner peripheral wall surface 48 a of the valve member receiving recess 48 in the female pipe joint cap 40 is not sealed and engaged with the seal ring 24.

  The valve member receiving recess 48 in the illustrated embodiment is provided with a front inner peripheral wall surface 48d having a larger inner diameter than the inner peripheral wall surface 48a in a front portion of the inner peripheral wall surface 48a. The front inner peripheral wall surface 48c inserts the cylindrical portion 42 of the female pipe coupling cap 40 into the second opening end 14 of the female pipe coupling 10 so as to connect the second cylindrical valve body 28b to the first opening end 12. When pushed in the direction, the outer peripheral surface of the first tubular valve body 28a is fitted around a small diameter portion 28d ahead of the step portion 28c, and the inner peripheral wall surface 48a and the front portion A step portion 48e is formed between the peripheral wall surface 48d. The step portion 48e has the same inner diameter as the first cylindrical valve body 28a, and a tapered portion 48f is formed between the step portion 48e and the inner peripheral wall surface 48a having a larger diameter than the step portion. Is formed. The stepped portion 48d with the tapered portion 48e has a tapered portion when the female pipe coupling cap 40 is pulled out from the female pipe coupling 10 and the sliding valve member 28 returns to the position shown in FIG. 48f presses the annular seal ring 24b inward in the radial direction so that the annular seal ring 24b is engaged with the annular seal ring 24b at the end surface of the first tubular valve body 28a that moves after the stepped portion 48d with the tapered portion 48f. In combination, the annular seal ring 24b is prevented from being removed from the valve seat portion 26.

  In the female pipe joint cap 40 according to the first embodiment, when the female pipe joint cap 40 is attached to the female pipe joint 10, the fluid pressure in the fluid passage 18 of the female pipe joint 10 is reduced. It passes through the periphery of the valve seat portion 26 of the fixed valve member 24 received in the valve body receiving recess 48 and reaches the inner portion of the valve body receiving recess 48 so that the fluid pressure is applied to the end face 26a of the fixed valve member. become. Therefore, fluid pressure is applied to the valve seat portion 26 from both sides in the axial direction. Therefore, even if a pressure fluctuation occurs in the fluid passage 18, the valve seat portion 26 changes only from one side. Therefore, it is possible to avoid the occurrence of fatigue failure as described above without applying pressure.

  3 and 4 show another embodiment of the female pipe coupling cap 40 according to the present invention. 3 and 4, the female pipe joint 10 is the same as that of FIGS. 1 and 2, and the same components in the female pipe joint 10 and the female pipe joint cap 40 are shown in FIGS. The same reference numbers as those shown in FIG. In the female pipe coupling cap 40 according to this embodiment, the sleeve 60 extends coaxially with the inner peripheral wall surface 48a in the valve member receiving recess 48 via the gap G between the inner peripheral wall surface 48a. When the cylindrical portion 42 of the female pipe joint cap 40 is inserted into the female pipe joint 10, the female pipe is connected via the gap G and the radial orifice 60a provided in the sleeve 60. The fluid passage 18 of the joint 10 communicates with a portion of the valve member receiving recess 48 behind the valve seat portion 26 of the fixed valve member 24.

  The sleeve 60 is provided with a pressing member 62 that is hermetically engaged with the sleeve and is slidable in the sleeve, and the cylindrical portion 42 of the female pipe fitting cap 40 is provided on the female pipe fitting 10. When inserted into the second opening end 14, the sleeve 60 is slid while sealingly engaging with the peripheral surface of the valve seat portion 26 of the fixed valve member 24, and the valve seat portion 26 comes close to the pressing member 62. State. At this time, the fluid pressure in the fluid passage 18 of the female pipe joint 10 is received in a portion deeper than the pressing member 62 in the valve member receiving recess 48 via the gap G and the radial orifice 60a. . The pressure member 62 is pressed against the valve seat portion 26 of the fixed valve member 24 by the fluid pressure.

  In the illustrated example, the female pipe coupling cap 40 has a through hole 48c extending in the axial direction from the inner part of the valve member receiving recess 48, and the pressing member 62 extends to the outside through the through hole 48c. An air vent hole 62b is provided that extends along the axis of the valve member receiving recess 48 from the surface 62a that contacts the end surface 26a of the valve seat portion 26 of the fixed valve member 24 and opens to the outside.

Female pipe joint 10; first open end 12; second open end 14; joint body 16; fluid passage 18; first tubular body 16a; second tubular body 16b; third tubular body 16c; Hole 20; radial connecting portion 22; fixed valve member 24; annular seal ring 24b; valve seat portion 26; end face 26a of the first valve member; sliding valve member 28; first tubular valve body 28a; Valve body 28b; Step 28c; Annular seal member 29; Spherical locker 30; Locking sleeve 32; Female pipe fitting cap 40; Cylindrical part 42; End face 42a; Annular seal member 43; Receiving recess 48; inner peripheral wall surface 48a; opening 48b; through hole 48c; front inner peripheral wall surface 48d; step portion 48e; taper portion 48f; sleeve 60;

Claims (5)

A female pipe attached to the second open end of a female pipe joint having a first open end to which a pressurized fluid pipe is connected and a second open end to which a male pipe joint is detachably inserted and connected. A coupling cap,
A tubular portion inserted into the second open end of the female pipe joint;
From the opening defined by the tubular portion and adapted to face the second opening end when the female pipe fitting cap is attached to the second opening end of the female fitting. A valve member receiving recess extending in a direction away from the open end;
A locking portion that is locked to the female pipe fitting when the tubular portion is inserted into the female pipe fitting;
When the cylindrical portion is inserted into the female pipe joint through the second opening end, the cylindrical section engages with a slide valve member set so as to be movable in the female pipe joint. A valve seat portion of a fixed valve member fixed to the female pipe joint and sealingly engaged with the sliding valve member radially inside the sliding valve member to close the fluid passage. The valve seat portion of the fixed valve member that has been inserted is inserted so as to be received in the valve member receiving recess,
The valve member receiving recess is formed when the cylindrical part is inserted into the female pipe joint and the female pipe joint cap is locked to the female pipe joint through the locking part. The fluid pressure in the fluid passage of the mold pipe joint is received in the back part of the valve member receiving recess than the valve seat part of the fixed valve member that is received in the valve member receiving recess, and is received in the back part. A female pipe coupling cap in which fluid pressure is applied to the valve seat portion of the fixed valve member toward the first opening end of the female pipe coupling.   An inner peripheral wall surface of the valve member receiving recess forms a gap with the valve seat portion of the fixed valve member received in the valve member receiving recess, and through the gap, the female pipe joint The female pipe coupling cap according to claim 1, wherein the fluid pressure of the fluid passage is received in the back portion of the valve member receiving recess.   The cap for a female pipe fitting according to claim 2, wherein the cylindrical portion has an annular seal that is in sealing engagement with the sliding valve member when the sliding valve member is pushed in.   The valve member receiving recess extends coaxially with the inner peripheral wall surface through a gap, and when the tubular portion is inserted into the female fitting, the fluid passage of the female fitting A sleeve that communicates with the back of the valve member receiving recess through the gap; a pressing member that is hermetically engaged with the sleeve and slidable within the sleeve; The sleeve is slid while sealingly engaging the valve seat portion of the fixed valve member when the cylindrical portion is inserted into the second open end of the female pipe joint, and the cylindrical portion is female. When inserted into the mold pipe joint, the fluid pressure of the fluid passage of the female pipe joint is received in the back part of the valve member receiving recess through the gap and the first pressure through the pressing member. The female pipe coupling cap according to claim 1, wherein the cap is fitted on the valve seat portion of the valve seat member. The valve member receiving recess includes a through hole that communicates from the inner part of the valve member receiving recess to the outside of the female pipe fitting cap along the axis of the valve member receiving recess.
The pressing member is slidably engaged with the peripheral wall of the through hole and is slidable,
Further, the pressing member includes a surface pressed by the valve seat portion of the fixed valve member, and an air communication hole extending from the surface along the axis of the valve member receiving recess to communicate with the atmosphere. The female pipe coupling cap according to claim 4.

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