JP6276558B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint comprising a male joint and a female joint.

  FIG. 3 shows one type of conventional pipe joint. In the pipe joint, a female joint (socket) 101 is provided with a slide member 102 having a valve function, and an end face seal member 103 is disposed on the front end face of the slide member 102. When the male joint (plug) 104 is inserted into the female joint 101, the front end face 105 of the male joint 104 abuts against the end face seal member 103 and the slide member 102 is displaced rearward, so that the male joint 104 and the female joint 101 is in fluid communication. In this fluid communication state, the front end face 105 of the male joint 104 is hermetically engaged with the end face seal member 103 to prevent fluid leakage from the pipe joint. In order to prevent this leakage more reliably, a peripheral surface seal member 107 is provided to seal between the outer peripheral surface 106 of the male joint 104 and the inner peripheral surface of the female joint 101, and the end surface seal member 103 and the peripheral surface are provided. The seal member 107 constitutes a double seal structure. Further, the slide member 102 is sealingly engaged with the inner peripheral surface of the cylindrical body 110 by a fixed seal member 109 via a wall surface portion 108 that is a separate body from the cylindrical body 110 of the female joint 101. (Patent Document 1).

No. 2-34557

  The above-described conventional pipe joint requires a wall surface portion 108 that is separate from the cylindrical body 110 due to its configuration, and accordingly, a fixed seal that seals and engages between the wall surface portion 108 and the cylindrical body. Member 109 is also required. However, considering the ease of assembly during manufacturing, it is desirable to reduce the number of parts as much as possible. In view of the risk of leakage of the internal fluid, it is also desired that the number of paths through which the internal fluid may leak is as small as possible.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a female joint that enables a simpler structure with fewer paths through which internal fluid may leak. To do.

That is, the present invention
A female joint for detachably connecting a male joint having a slide valve body,
A front end portion, a through hole extending rearward from the front end portion, and an inner axis of the through hole extending from an inner peripheral surface of the through hole in the through hole and forming a cylindrical space between the inner peripheral surface and the inner peripheral surface A cylindrical female joint body having an inner cylindrical portion extending forward in the direction;
A cylindrical slide member slidably held in the axial direction in the cylindrical space of the female joint body;
An elastic member that is disposed in the cylindrical space of the female joint body and biases the slide member forward in the axial direction;
When the male joint is inserted into the through hole of the female joint main body, a valve pusher for contacting the slide valve body of the male joint and opening the slide valve body, A valve pressing body having a slide member locking portion that is engaged and fixed to the inner cylindrical portion and protrudes outward from the outer peripheral surface of the inner cylindrical portion at a front position of the inner cylindrical portion;
An annular first seal member disposed on the front end surface of the slide member;
An annular second seal member fixed to the inner peripheral surface of the through-hole,
In a state where the male joint is not inserted into the through hole of the female joint body, the slide member locking portion of the valve pressing body is engaged with the slide member biased by the elastic member. And preventing the slide member from moving forward,
In a state where the male joint is inserted into the through hole of the female joint body and connected to the female joint, a front end surface of the male joint comes into contact with the first seal member and the slide member Is displaced rearward against the urging force of the elastic member and sealingly engaged with the first seal member, and the outer peripheral surface of the male joint is sealingly engaged with the second seal member. A female fitting is provided.

  In this female joint, since the female joint main body forming a cylindrical space for slidably holding the slide member is constituted by an integral member, an additional member is provided to hold the slide member. The number of parts can be reduced as compared with the conventional pipe joint that had to be provided. Further, there is no possibility that the internal fluid leaks from the connecting portion between the members.

  Preferably, the second seal member can be prevented from engaging with the outer peripheral surface of the slide member in a state where the male joint is not inserted into the through hole of the female joint.

  With such a structure, it is possible to prevent the second seal member from being worn out and deteriorated by sliding with the slide member.

  Preferably, a third seal member hermetically fixed to the inner peripheral surface of the slide member is further provided, and the third seal member is slidably and slidably engaged with the outer peripheral surface of the inner cylindrical portion. Can be.

  Specifically, the valve pressing body can be engaged and fixed to the inner cylindrical portion of the female joint main body by a snap fit.

  The present invention also provides the female joint and a male joint that is inserted into the through hole of the female joint and connected to the female joint, and the female joint is inserted into the through hole. And a male joint having a slide valve body which is pushed by the valve pusher of the joint to open.

  Hereinafter, an embodiment of a female joint according to the present invention will be described with reference to the accompanying drawings.

It is side surface sectional drawing in the state in which the male coupling and the female coupling are not connected of the pipe coupling which concerns on this invention. It is side surface sectional drawing in the state in which the male coupling and the female coupling of the pipe coupling of FIG. 1 were connected. It is a side surface fragmentary sectional view which shows the conventional pipe joint.

  As shown in FIG. 1, a pipe joint 1 according to an embodiment of the present invention includes a male joint 2 having a slide valve body 3 and a female joint 12 that is detachably connected to the male joint 2. . The male joint 2 includes a male joint body 5 having a through-hole 4, a slide valve body 3 slidably disposed in the front-rear direction in the through-hole 4, and the slide valve body 3 in front of the male joint 2. A spring 6 that is biased (left side in the figure) and a seal member 7 that is provided on the outer peripheral surface of the slide valve body 3 and that is in sealing engagement with the inner peripheral surface of the through hole 4 of the male joint body 5 .

  The female joint 12 has a cylindrical female joint body 14. The female joint body 14 includes a through hole 18 extending rearward from the front end 15 to the rear end 16, and an inner peripheral surface 20 of the through hole 18. An inner cylindrical portion 24 extending forward in the axial direction L of the through hole 18 is provided so as to form the cylindrical space 22. A slide member 32 is held in the cylindrical space 22 so as to be slidable in the axial direction L. The slide member 32 has a first seal member engagement groove 36 on its front end surface 34, and a first seal member engagement groove 36 is hermetically engaged with the front end surface 8 of the male joint body 5. One seal member 50 is fitted and fixed. A spring 52 as an elastic member is set between the spring receiving portion 40 formed at the rear end portion 38 of the slide member 32 and the spring receiving portion 28 located at the rear end of the cylindrical space 22. The slide member 32 is urged forward in the axial direction L by the spring 52. When the male joint 2 is inserted into the through hole 18 of the female joint body 14 at the front end portion 26 of the inner cylindrical portion 24, the slide valve body 3 comes into contact with the slide valve body 3 of the male joint 2. A valve pusher 54 for opening the door is engaged and fixed. The valve pressing body 54 is provided with a slide member locking portion 56 formed so as to protrude outward from the outer peripheral surface 30 of the inner cylindrical portion 24 at a position in front of the inner cylindrical portion 24. When the locking surface 44 formed on the inner peripheral surface 42 of the slide member 32 is engaged with the slide member locking portion 56, the slide member 32 biased by the spring 52 moves further forward to form a cylindrical shape. It is prevented from coming out of the space 22. A second seal member engagement groove 58 is formed on the inner peripheral surface 20 of the through hole 18 of the female joint body 14, and an annular second seal member 59 is attached to the second seal member engagement groove 58. It has been. The second seal member 59 is configured to sealingly engage with the outer peripheral surface 9 of the male joint body 5 in the connected state shown in FIG.

  A third seal member engagement groove 60 is provided on the inner peripheral surface 42 of the slide member 32, and a third seal member 61 is attached to the third seal member engagement groove 60. The third seal member 61 seals between the inner peripheral surface 42 of the slide member 32 and the outer peripheral surface 30 of the inner cylindrical portion 24 while slidingly engaging with the outer peripheral surface 30 of the inner cylindrical portion 24. A recess 48 is formed in the outer peripheral surface 46 of the slide member 32. By providing the recess 48, the contact area between the outer peripheral surface 46 of the slide member 32 and the inner peripheral surface 20 of the through hole 18 is reduced, and the weight of the slide member 32 is reduced. Further, when the slide member 32 is assembled into the cylindrical space 22, the outer peripheral surface 46 of the slide member 32 is inserted while being rubbed against the second seal member 59, but comes into contact with the second seal member 59 by the recess 48. Since the area of the outer peripheral surface 46 is reduced, the load on the second seal member 59 can be reduced.

  The valve pressing body 54 is provided with a cylindrical engagement fixing portion 62 at a rear position of the slide member locking portion 56. The engagement fixing portion 62 includes an engagement groove 67 that engages with an engagement protrusion 66 provided on the inner peripheral surface 31 of the inner cylindrical portion 24, and an insertion guide portion that is located further rearward of the engagement groove 67. 68. The insertion guide portion 68 is provided with two slits 69, and the insertion guide portion 68 is divided into two on the front side and the back side in the figure (only the back side portion is shown in the figure). ). The insertion guide part 68 can be bent in the radial direction by being divided by the slit 69. As the valve pusher 54 is inserted into the inner cylindrical portion 24, the tapered outer peripheral surface 70 of the insertion guide portion 68 engages with the inner peripheral surface 31 of the inner cylindrical portion 24, and the insertion guide portion 68 is moved. It is elastically deformed inside and bends. When the engagement groove 67 is inserted to a position where the engagement groove 67 is aligned with the engagement protrusion 66 of the inner cylindrical portion 24, the engagement groove 67 and the engagement protrusion 66 are engaged and the insertion guide portion 68 is in its original shape. The valve pusher 54 is engaged and fixed to the inner cylindrical portion 24. Thus, the valve pressing body 54 is engaged and fixed to the inner cylindrical portion 24 by snap fitting. The number of slits may be 3 or more. A conical portion 71 that tapers forward and a valve push rod portion 72 that extends straight forward from the conical portion 71 are provided at a position ahead of the slide member locking portion 56 of the valve pusher 54. It has been. In the conical portion 71, three openings 73 are formed at equal intervals in the circumferential direction, and a fluid passes through the openings 73. In the drawing, only one of the three openings 73 is displayed.

  The female joint 12 further includes a cylindrical sleeve 76 that slides on the outer peripheral surface 74 of the female joint main body 14 and a coaxial joint with the sleeve 76 so as to cover the outer peripheral surface 77 of the sleeve 76. And a cylindrical sleeve holding member 78 fixed to 14. A spring 82 is disposed between the spring receiving portion 79 on the inner peripheral surface of the sleeve holding member 78 and the rear end surface 80 of the sleeve 76, and the sleeve 76 is attached to the front in the axial direction L by the spring 82. It is energized. A lock ball holding hole 86 for holding the lock ball 84 is provided at a position in front of the second seal member engagement groove 58 of the female joint main body 14. The slide member 32 is provided with a lock ball support outer peripheral surface 88 that supports the lock ball 84 from the inside. In the state before the connection shown in FIG. It is held in a state sandwiched between the surface 88 and the inner peripheral inclined surface 90 of the sleeve 76. Further, the second seal member 59 is positioned outside the lock ball support outer peripheral surface 88 of the slide member 32, but the second seal member 59 is not engaged with the lock ball support outer peripheral surface 88. By preventing the second seal member 59 from slidingly engaging with the slide member 32, the sliding friction resistance to the slide member 32 is reduced to facilitate the connection operation of the male joint 2, and the second seal member The wear of 59 can be reduced and the durability can be improved.

  When the male joint 2 is inserted into the through hole 18 from the front end portion 15 side of the female joint body 14 from the state of FIG. 1 toward the state of FIG. 1 abuts on the seal member 50. Further, when the male joint 2 is inserted and the slide groove 32 is displaced rearward against the biasing force of the spring 52, the lock groove 10 of the male joint 2 reaches the inner side in the radial direction of the lock ball 84. The lock ball 84 is pushed inward in the radial direction by the inner peripheral inclined surface 90 of the sleeve 76 and fits into the lock groove 10 of the male joint 2, and accordingly, the lock ball 84 and the inner peripheral inclined surface 90 of the sleeve 76. The engagement is released, and the sleeve 76 moves forward by the biasing force of the spring 82. At this time, the valve push rod portion 72 of the valve pusher 54 comes into contact with the slide valve body 3 of the male joint 2 so that the slide valve body 3 is located behind the male joint 2 (on the right side in the drawing) and the male joint body 5. The seal engagement between the slide valve body 3 and the male joint body 5 is released. In this way, as shown in FIG. 2, the through-hole 4 of the male joint 2 and the through-hole 18 of the female joint 12 are in fluid communication and the male joint 2 and the female joint 12 are connected. Become. At this time, the first seal member 50 is pressed against the front end surface 8 of the male joint 2 by the urging force of the spring 52 and is in a state of sealingly engaging with the front end surface 8 of the male joint 2. Further, the second seal member 59 is compressed by the outer peripheral surface 9 of the male joint 2 and is in a state of sealingly engaging with the outer peripheral surface 9 of the male joint 2.

  Thus, in the female joint 12 according to the present embodiment, the female joint body 14 having the through hole 18 is formed as an integral member, so that the internal fluid is exposed to the outside in the connected state with the male joint 2. A path that may leak is limited to a path between the inner peripheral surface 20 of the through-hole 18 of the female joint body 14 and the outer peripheral surface 9 of the male joint body 5. Therefore, if this path is sealed, fluid leakage can be prevented, so that the number of seal members can be reduced as compared with the conventional one, and the shape of the seal members can be simplified. The second seal member 59 for sealingly engaging this path has an annular shape having a relatively simple cross-sectional shape. Further, in the present embodiment, the female joint 12 includes the first and third seal members 50 and 61, and the second seal member 59 is used for fluid from the first seal member 50 or the third seal member 61. Even when leakage occurs, it functions as an auxiliary sealing member for preventing fluid from leaking to the outside. By providing such a second seal member 59, a double seal structure for further reliably preventing fluid leakage is configured. .

  In the female joint 12 according to the present embodiment, a valve pressing body in which a slide member locking portion 56 for preventing the slide member 32 from coming off the cylindrical space 22 is separated from the female joint body 14. 54. When inserting the slide member 32 into the cylindrical space 22 at the time of assembly, the valve pusher 54 can be removed, so that the slide member 32 is pushed by the slide member 32 so that the slide member locking portion 56 is pushed away. There is no need to fit. As a result, the assembly work can be performed without applying excessive force to the slide member 32, the third seal member 61, the slide member locking portion 56, and the like, so that the work can be easily performed and the member can be damaged. Also disappear. In addition, when a projecting portion such as the slide member locking portion 56 is formed integrally with the female joint body 15, for example, when a part is produced by resin molding, the projecting portion is released when the mold is released from the mold. In this embodiment, since the slide member locking portion 56 is provided on the valve pusher 54 which is a separate member, the mold release operation when manufacturing the female joint body 14 is facilitated. At the same time, the possibility of damaging the slide member locking portion 56 is eliminated.

  In the present embodiment, the third seal member 61 is provided on the inner peripheral surface 42 of the slide member 32. A sealing engagement can also be provided. However, when the third seal member 61 is provided on the outer peripheral surface 46, the third seal member 61 is inserted into the cylindrical space 22 of the female joint body 14 together with the slide member 32. In the state compressed by the surface 20, the lock ball holding hole 86 and the second seal member engagement groove 58 are passed over, and at that time, the third seal member 61 may be damaged. Therefore, it is preferable to provide the third seal member 61 on the inner peripheral surface of the slide member 32 so as not to be damaged by a groove or the like as in the present embodiment.

Pipe joint 1; Male joint 2; Slide valve body 3; Through hole 4; Male joint body 5; Spring 6; Seal member 7; Front end surface 8; Outer peripheral surface 9; Joint body 14; front end 15; rear end 16; through hole 18; inner peripheral surface 20; cylindrical space 22; inner cylindrical portion 24; front end 26; spring receiving portion 28; Slide member 32; front end surface 34; first seal member engaging groove 36; rear end portion 38; spring receiving portion 40; inner peripheral surface 42; locking surface 44; outer peripheral surface 46; Spring 52; valve pusher 54; slide member locking portion 56; second seal member engagement groove 58; second seal member 59; third seal member engagement groove 60; third seal member 61; 62; engagement protrusion 66; engagement groove 67; insertion guide portion 68; slit 69; Par-shaped outer peripheral surface 70; conical portion 71; valve push rod portion 72; opening 73; outer peripheral surface 74; sleeve 76; outer peripheral surface 77; sleeve holding member 78; spring receiving portion 79; Ball 84; lock ball holding hole 86; lock ball support outer peripheral surface 88; inner peripheral inclined surface 90; axial direction L;

Claims (4)

A female joint for detachably connecting a male joint having a slide valve body,
A cylindrical female joint main body having a front end portion , a through hole extending rearward from the front end portion , and a lock ball holding hole penetrating in a radial direction, and extending from an inner peripheral surface of the through hole in the through hole A female joint body integrally formed with an inner cylindrical portion extending forward in the axial direction of the through-hole so as to form a cylindrical space between the inner peripheral surface,
A lock ball that is held in the lock ball holding hole so as to be displaceable in a radial direction, and engages with a lock groove of a male joint inserted into the through hole of the female joint body;
A cylindrical slide member slidably held in the axial direction in the cylindrical space of the female joint body;
An elastic member that is disposed in the cylindrical space of the female joint body and biases the slide member forward in the axial direction;
The slide of the male joint for communicating the through hole of the male joint with the through hole of the female joint body when the male joint is inserted into the through hole of the female joint body. A valve pressing body for contacting the valve body and displacing the slide valve body to the rear of the male joint, and is engaged and fixed to the inner cylindrical portion; A valve pressing body having a slide member locking portion protruding outward from the outer peripheral surface of the inner cylindrical portion;
An annular first seal member disposed on the front end surface of the slide member;
An annular second seal member fixed to the inner peripheral surface of the through hole;
With
In a state where the male joint is not inserted into the through hole of the female joint body, the slide member locking portion of the valve pressing body is engaged with the slide member biased by the elastic member. And preventing the slide member from moving forward,
In a state where the male joint is inserted into the through hole of the female joint body and connected to the female joint body, the through hole of the female joint body and the through hole of the male joint are in fluid communication. The through hole in fluid communication with a front end surface of the male joint sealingly engaged with the first seal member and an outer peripheral surface of the male joint sealingly engaged with the second seal member The path from the slide member and the front end surface of the male joint to the outside of the female joint is double sealed by the first seal member and the second seal member ,
The slide member has a lock ball support outer circumferential surface that supports the lock ball from the radially inner side in a state where the male joint is not connected and does not engage with the lock groove of the male joint, The lock ball support outer peripheral surface is a female joint that is spaced radially inward from the inner peripheral surface of the through hole so as not to engage with the second seal member fixed to the inner peripheral surface of the through hole . An annular third seal member fixed to the inner peripheral surface of the slide member and slidably and slidably engaged with the outer peripheral surface of the inner cylindrical portion;
In a state where the male joint is inserted into the through hole of the female joint body and connected to the female joint, the fluid is communicated between the slide member and the inner cylindrical portion from the through hole. 2. The female joint according to claim 1, wherein a path extending through the female joint to the outside is double-sealed by the third seal member and the second seal member .   The female joint according to claim 1 or 2, wherein the valve pressing body is engaged and fixed to the inner cylindrical portion of the female joint main body by a snap fit.   A female joint according to any one of claims 1 to 3, and a male joint inserted into the through hole of the female joint and connected to the female joint, wherein the female joint is inserted into the through hole. And a male joint having a slide valve body that is pushed by the valve pusher of the female joint when opened.

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