JP5172804B2 - Female fitting for pipe fitting - Google Patents

Description

  The present invention relates to a female joint member in a pipe joint, and in particular, an inner valve seat portion is provided at a radially central portion of a tubular joint body, and a position of an inner peripheral surface of the joint body corresponding to the inner valve seat portion. A closed position in which a tubular or annular valve member is provided in the joint body, and the valve member engages with the inner and outer valve seat portions to close the flow path of the joint body. Further, the present invention relates to a female joint member that can be displaced in the axial direction between the valve seat portion and an open position where the flow path is opened.

  The male and female joint members of the pipe joint are usually provided with valve means for opening and closing the flow path inside the tubular joint body. There are various types of valve means, and the cylindrical valve member is slidable with the inner peripheral surface of the joint body, and a valve seat is set at the center in the radial direction of the joint body. When the member is in the flow path closing position, there is one in which the flow path is closed by sealingly engaging the valve seat portion. In this type of joint member, a seal member such as an O-ring is set between the outer peripheral surface of the valve member and the inner peripheral surface of the joint body, and fluid leaks from the gap between the male and female joint members. (For example, refer patent document 1). Further, instead of using a seal member, there is a valve member itself formed of rubber or the like so as to serve as a seal member (see, for example, Patent Document 2).

However, such a seal member is likely to be worn by friction due to the movement of the valve body. For this reason, an outer valve seat portion protruding so as to surround the fluid passage on the inner peripheral surface of the tubular joint body and an inner valve seat portion on the radially inner side corresponding to the outer valve seat portion are provided. And when the female joint member is released and the valve member is in the flow path closed position, the valve member sealably engages the outer and inner valve seats to prevent fluid leakage, When the female joint member is connected, the valve member has been developed so as to be in the open position away from the outer and inner valve seats. (For example, patent document 3). In this joint member, when the valve member is in the flow path closing position, fluid leakage is prevented by sandwiching the annular outer and inner annular seal members between the outer and inner valve seats and the valve member. However, it is difficult to make the valve member start pressing the outer and inner seal members at the same time. Therefore, one seal member is pressed quickly and the other seal member is not It is likely that the movement of the valve member is stopped before the pressure necessary to perform the sealing action is made.

  In view of such a point, the inventor of the present application, when the valve member approaches the closed position, the outer annular seal member attached to the valve member is pressed against the outer valve seat portion, and at the same time, the inner side attached to the valve member. The outer annular seal member is in sufficient sealing engagement with the outer valve seat portion such that the annular seal is elastically deformed to curve backward while engaging the inner valve seat portion. A female joint member has been developed that does not obstruct the movement of the valve member, and that the sealing engagement by the outer and inner annular seal members is both appropriate (Patent Document 4). However, in this female joint member, fluid may leak from the gap between the outer and inner annular seal members and the valve member to which the outer and inner annular seal members are attached, for example. I found out that Moreover, the operation | work which attaches an outer side and an inner side annular seal member to a valve member is complicated, and the cost has become high.

U.S. Pat. No. 4,936,345 Japanese Utility Model Publication No. 64-49791 Japanese Patent No. 2694299 Japanese Patent No. 3909339

  An object of the present invention is to provide a female joint member that can solve the problem of the joint member disclosed in Patent Document 4.

That is, the present invention
A tubular joint body including a front end opening, a male joint member receiving portion extending rearward from the front end opening, and a fluid passage communicating with the fluid passage of the male joint member received in the male joint member receiving portion; ,
A valve device provided in the joint body for opening and closing between the fluid passages;
A female joint member of a pipe joint having
The valve device is
An outer valve seat projecting so as to surround the male joint member receiving portion on the inner peripheral surface of the joint body, and being coaxial with the joint body;
An inner valve seat disposed radially inward of the outer valve seat and coaxial with the joint body, the inner valve seat defining an annular valve opening with the outer valve seat And
A valve member provided inside the joint body so as to be displaceable in the axial direction;
The valve member is biased toward the front to be in a closed position where the valve member is sealingly engaged with the outer and inner valve seats, and is opened rearward from the outer and inner valve seats. A spring member that allows
The valve member
A guide member having a guide portion that enters the valve opening and guides the valve member so as to be coaxial with the joint body when moving from the open position to the closed position;
The valve member has an annular outer engagement portion that is coaxial with the joint body and is attached to a rear surface side of the guide member, and an annular inner engagement portion that extends radially inward from the outer engagement portion. When the valve moves forward from the open position and approaches the closed position, the outer and inner engagement portions engage with the corresponding outer and inner valve seat portions, and are elastically deformed to seal the outer and inner valve seat portions. An annular seal member adapted to fit together;
A cylindrical support member attached to the rear surface side of the seal member and extending rearward adjacent to the inner peripheral surface of the joint body, the cylindrical support fixing the outer engagement portion between the guide member and the cylindrical support member A female joint member is provided.

  In this female joint member, the outer engaging portion of the seal member is fixed between the guide member and the cylindrical support member as described above, and the inner engaging portion provided inside the outer engaging portion. Is positioned radially inward of the guide portion of the guide member, and when the valve member reaches the closed position and the outer engagement portion is sealingly engaged with the outer valve seat portion, the outer engagement portion is The inner engagement portion does not prevent sealing engagement with the outer valve seat portion, and enables the inner engagement portion to obtain a sealed engagement state with the inner valve seat portion. Further, since the seal member is a single member, the seal member with respect to the components of the valve member such as the guide member in the state where the outer and inner engagement portions are sealingly engaged with the outer and inner valve seat portions. Even if the coupling is incomplete, the fluid does not leak from the coupled portion.

  Specifically, the annular seal member has an annular extension portion in which the inner engagement portion extends radially inward from the guide portion of the guide member, the valve member reaches the closed position, and the outer engagement portion is When the outer valve seat portion is hermetically engaged with the outer valve seat portion, the inner valve seat portion is elastically deformed so that the inner engagement portion is bent backward by the engagement of the annular extension portion with the inner valve seat portion. It can be made to seal between. The annular extension of the inner engagement portion does not prevent the inner engagement portion from sealingly engaging the outer engagement portion with the outer valve seat portion, and the inner engagement portion is accompanied by such a curvature while the inner engagement portion is accompanied by such a curvature. Sealing engagement with the part enables more secure sealing engagement at the outer and inner valve seats.

The outer valve seat portion is coaxial with the joint body, and has an annular inclined surface that decreases in diameter toward the front, and extends forward from the front end edge of the annular inclined surface coaxially with the joint body. A cylindrical guide surface that defines,
The guide member of the valve member has a locking portion whose diameter increases from the rear end of the guide portion entering the valve opening toward the rear, and the locking portion is set to the closed position. In this state, the outer valve seat portion can be substantially in contact with the annular inclined surface.

  When a high pressure in the female joint member is applied to the seal member, the engaging portion of the guide member abuts against the annular inclined surface of the outer valve seat portion, thereby preventing the seal member from jumping outward. It is possible to do that.

  More specifically, the annular seal member is bonded to the cylindrical support member and the guide member at the outer engagement portion, and the inner engagement portion is attached to the cylindrical support member and the guide member. It can be non-adhesive.

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

It is a vertical side view of the pipe joint which consists of the female joint member which concerns on this invention, and the male joint member connected with this female joint member. It is a vertical side view of the pipe joint, and shows a state in which a female joint member is connected to a male joint member. It is a disassembled side view of a valve member. It is the disassembled perspective view which looked at the valve member from the back upper part. It is the disassembled perspective view which looked at the valve member from the front upper part.

  As shown in FIG. 1, a female joint member 10 according to the present invention constitutes a pipe joint 14 together with a male joint member 12.

  The male joint member 12 is set in the tubular joint body 16 and the joint body 16 and is biased by the compression spring 18 to close the fluid passage 22 of the male joint member 12 ( 1). The valve member 20 includes a valve main body 23 that supports the annular seal 21, and a spring receiving member 27 that is fixed to the valve main body 23 with a tip caulked on a protrusion (pin) 25 provided at the center of the rear surface of the valve main body 23. And have. The spring receiving member 27 is formed by pressing a metal plate. The spring receiving member 27a is formed in an annular shape and receives the compression spring 18, and a cylindrical spring holding portion 27b provided on the periphery of the spring receiving portion 27a. The spring receiving portion 27a is provided with a hole 27c for allowing fluid to pass therethrough. A normal valve member is formed long corresponding to the protrusion 25 and a compression coil spring is set around it. In the present invention, the compression coil spring 18 is supported by the spring receiving member 27 as described above. As a result, the diameter of the compression spring 18 can be increased and the spring material can be made thicker, and therefore the length thereof can be shortened. In addition to the cost reduction by press molding of the spring receiving member 27, the male mold The manufacturing cost of the joint member 12 can be reduced.

  The female joint member 10 includes a front end opening 30, a joint main body 36 extending rearward from the front end opening 30 and having a male joint member receiving portion 32 for receiving the male joint member 12, and a rear end of the joint main body 36. And a fluid passage tube 44 extending forward in the joint body 36.

  The joint body 36 includes an outer valve seat portion 42 projecting from the inner peripheral surface 40 so as to surround the male joint member receiving portion 32. The fluid passage pipe 44 includes an inner peripheral surface that defines the fluid passage 34, an outer peripheral surface 50 that forms a tubular valve member storage space 46 between the inner peripheral surface 40 of the joint body 36, and a front end of the fluid passage 34. An inner valve seat portion 52 that closes and forms an annular valve opening 48 (FIG. 2) between the joint body 36 and the outer valve seat portion 42, and the valve member storage space 46 and the fluid at a position rearward of the inner valve seat portion 52. A communication hole 54 is provided to communicate with the passage 34. Four communication holes 54 are provided at intervals of 90 °.

  In the valve member storage space 46, a displacement is provided in the front-rear direction with respect to the inner peripheral surface 40 of the joint body 36 and the outer peripheral surface 50 of the fluid passage pipe 44, and the outer valve seat portion 42 and the inner valve seat portion 52 are provided. The closed position (FIG. 1) that engages and closes the valve opening 48 is contacted by the male joint member 12 inserted into the male joint member receiving portion 32, and the rear side in the valve member storage space 46 from the closed position. An annular or tubular valve member 60 which is pushed into the open position (FIG. 2) away from the outer valve seat portion 42 and the inner valve seat portion 52 and opens the valve opening 48 (FIG. 2), and A compression spring 62 is provided to urge the valve member 60 toward the closed position.

  When the inner peripheral surface 40 of the joint body 36 and the outer peripheral surface 50 of the fluid passage pipe 44 are provided with annular communication recesses 64 and 66, respectively, when the valve member 60 in the open position moves toward the closed position. In addition, fluid in the space ahead of the valve member 60 in the valve member storage space 46 flows rearward through the communication recesses 64 and 66, and this communication recess as in the conventional pipe joint described above. Compared to the case where no is provided, the resistance to the movement of the valve member 60 is reduced.

  Specifically, the valve member 60 includes an annular seal member 68 made of an elastic member such as rubber or resin that is sealingly engaged with the outer valve seat portion 52 and the inner valve seat portion 42 when in the closed position, and a seal. A cylindrical support member 72 made of a rigid material such as a metal having a cylindrical portion 70 attached to the rear surface of the member 68 and coaxially disposed adjacent to the inner peripheral surface 40 of the joint main body 36, and the seal member 68. And a guide portion 76 that guides the valve member 60 so as to be coaxial with the joint body 36 when the valve member 60 moves from the open position to the closed position. And a guide member 75 made of a rigid material such as metal. The cylindrical support member 72 and the guide member 75 and the seal member 68 are connected by an adhesive or the like.

The outer valve seat portion 42 is coaxial with the joint body 36, and has an annular inclined surface 42a that decreases in diameter toward the front, and extends forward from the front end edge of the annular inclined surface 42a coaxially with the joint body 36. And a cylindrical guide surface 42 b that defines the opening 48. The guide member 75 has a locking portion 77 having a diameter that increases from the guide portion 76 entering the valve opening 48 toward the rear, and the locking portion 77 is in a state in which the valve member 60 is in the closed position. Even if the valve member 60 is subjected to a high pressure in the female joint member when the valve member 60 is in the closed position, the valve member 60 passes through the valve opening 48. I try not to jump out. In the illustrated embodiment, the inner valve seat portion 52 faces the outer valve seat portion 42, and has a cylindrical guide surface 52 a coaxial with the joint body 36, and a radially inner side from the rear edge of the guide surface. And a guide portion 76 of the guide member 75 in a valve opening 48 formed between the outer valve seat portion 42 and the guide surfaces 42b, 52a of the inner valve seat portion 52. It is made to enter.

  The annular seal member 68 has an inner engagement portion 68a and an outer engagement portion 68b. When the valve member 60 moves forward from the open position and approaches the closed position, the outer and inner engagement portions 68b, 68a. Is engaged with the corresponding outer side and inner valve seat portions 42 and 52, and the valve member is advanced to the closed position while being elastically deformed. The inner engagement portion 68 a has an annular extension 68 a ′ extending radially inward from the guide portion 75 of the guide member 75, the valve member 60 reaches the closed position, and the outer engagement portion 68 a becomes the outer valve seat portion 42. 2, the annular extension 68 a ′ is elastically deformed so as to bend backward by the engagement with the inner valve seat 52, as shown in FIG. It is designed to seal between them.

  The cylindrical support member 72 has, at its front end, an annular support portion 73 having an inverted L-shaped portion whose annular longitudinal cross-sectional shape is in contact with and adhered to the rear surface of the outer engagement portion 68b of the seal member 68. When engaged with the inner valve seat portion 42, the inner engagement portion 68a is configured to curve backward on the radially inner side of the annular support portion 73. Specifically, the seal member 68 is bonded to the guide member 75 at a front surface portion substantially corresponding to the rear surface portion bonded to the annular support portion 73, and the outer engagement portion 68b is defined between the front and rear bonded surfaces. When the valve member 60 is in the closed position, the annular inclined surface 42a is surely pressed, and the inner engagement portion 68a is a portion extending inward from the outer engagement portion 68b. The guide member 75 has great flexibility without being bonded.

  The outer peripheral surface 50 of the fluid passage tube 44 has a slightly smaller diameter than the inner peripheral surface 68a of the annular seal member 68, and the annular seal when the valve member 60 is displaced between the closed position and the open position. The inner peripheral surface 68a of the member 68 has a seal member proximity portion 50a that is substantially slidable, and the communication recess 66 is annular when the valve member 60 is in the open position, as shown in FIG. When the valve member 60 starts to move from the open position to the closed position, the valve member storage space 46 is in a space in front of the seal member 68. A fluid is allowed to flow backward through the communication recess 66.

  The outer peripheral surface of the seal member 68 has substantially the same outer diameter as the cylindrical portion 70 of the cylindrical support member 72. The inner peripheral surface 40 of the joint main body 36 has a guide portion 40a extending rearward from a position substantially in contact with the outer peripheral surface of the seal member 68 of the valve member 60 when in the open position, and the above-described extension extending forward from the front end of the guide portion 40a. And a communication recess 64. The guide portion 40a is configured to be substantially in contact with the outer peripheral surface 70a of the cylindrical portion 70 of the support member 72, and guides the valve member 60 that is displaced between the open position and the closed position so as not to tilt. The communication concave portion 64 facilitates the flow of both bodies between the front and rear spaces when the valve member 60 moves back and forth, but particularly when the valve member 60 moves from the open position toward the closed position. In addition, the fluid easily flows from the front to the rear of the valve member 60, and the resistance to the movement of the valve member 60 is reduced.

  In the illustrated example, a communication hole 74 is provided in the cylindrical portion 70 of the cylindrical support member 72 so as to be spaced apart in the circumferential direction, and the seal member 68 of the valve member 60 is connected via the communication recess 64. The fluid that flows rearward can easily flow to the rear space of the valve member 60 via the communication hole 74.

  In the illustrated example, the joint body 36 includes a spherical lock 80 set in a locking hole extending in a radius, an operation sleeve 82 that is displaceable in the front-rear direction on the outer peripheral surface of the joint body 36, and the operation As shown in the figure, the sleeve 82 has a compression spring 84 that urges the locking element 80 to a locking position for pressing the locking element 80 inward from the outside in the radial direction. When the male joint member 12 is connected to the female joint member 10, the operator displaces the operation sleeve 82 to the left as seen in the figure, and the inner diameter of the operation sleeve 82 is increased. When the male joint member 12 is inserted so that the formed locking element opening portion 86 is positioned radially outside the locking element 80, and the operator releases the operation sleeve 82 at the time of insertion, the compression spring 84 is released. As a result, the operating sleeve 82 is displaced to the position shown in the figure, whereby the locking element 80 is fitted into the locking element receiving groove 90 provided on the outer peripheral surface of the male coupling member 12, and the male coupling member 12 and the female coupling member 10 is connected and fixed.

  When the male joint member 12 connected to the female joint member 10 as shown in FIG. 2 is moved to the left by displacing the operating sleeve 82 and pulled out from the female joint member 10 to the right. The valve member 60 is displaced to the right by the spring force of the compression spring 62 so as to follow the male joint member 12.

  At this time, the space behind the valve member 60 in the valve member storage space 46 has a large volume and needs to be filled with fluid, whereas the volume in the space in front of the valve member 60 in the valve member storage space 46 has a small volume and fluid. Needs to flow into the rear space of the valve body. In the female joint member 10 according to the present invention, the communication recess 66 provided on the outer peripheral surface 50 of the fluid passage pipe 44 extends across the front and rear of the seal member 68 when the valve member 60 starts to move. Therefore, the fluid is filled in the rear space of the valve member 60 through the communication recess 66, and the valve member 60 can be smoothly displaced. Further, the communication recess 64 provided on the inner peripheral surface 40 of the joint body 36 is located immediately after the valve member 60 starts to move, and the seal member 68 is located at the position where the communication recess 64 is located. Flows rearwardly through the communication recess 64 and easily flows into the rear space of the valve member 60 through the communication hole 74 formed in the tubular portion 70. By doing so, even if the male joint member 12 is suddenly pulled out, the valve member 60 quickly returns to the closed position, so that the fluid leaks from the female joint member 10 as much as possible. can do.

  It is preferable that the valve member 60 is not inclined as much as possible when the valve member 60 is displaced, and the guide portion 40a of the inner peripheral surface 40 of the joint body 36 is preferably long. In the illustrated example, the valve member 60 is at the closed position. In some cases, the rear end of the cylindrical portion 70 overlaps the front end of the guide portion 40a so that the guide portion 40a can guide the valve member 60 from when the valve member 60 starts to move to the open position. ing.

  As mentioned above, although it demonstrated per embodiment of the female coupling member which concerns on this invention, this invention is not limited to this.

  Female joint member 10; male joint member 12; pipe joint 14; joint body 16; compression spring 18; valve member 20; annular seal 21; fluid passage 22; Spring holding portion 27b; front end opening 30; male joint member receiving portion 32; joint body 36; inner peripheral surface 40; guide portion 40a; outer valve seat portion 42; fluid passage pipe 44; Valve opening 48; outer peripheral surface 50; seal member proximity part 50a: inner valve seat 52: communication hole 54; valve member 60; compression spring 62; communication recesses 64 and 66; seal member 68; The outer peripheral surface 68c; the inner peripheral surface 68d; the cylindrical portion 70; the support member 72; the annular support portion 73; the communication hole 74; the guide member 75; the guide portion 76; the lock 80; the operation sleeve 82; 84: Locking element opened Part 86; locking element receiving grooves 90

Claims (7)

A tubular joint body including a front end opening, a male joint member receiving portion extending rearward from the front end opening, and a fluid passage communicating with the fluid passage of the male joint member received in the male joint member receiving portion; ,
A valve device provided in the joint body for opening and closing between the fluid passages;
A female joint member of a pipe joint having
The valve device is
An outer valve seat projecting so as to surround the male joint member receiving portion on the inner peripheral surface of the joint body, and being coaxial with the joint body ;
A valve member provided inside the joint body so as to be displaceable in the axial direction;
Spring to allow with the valve member valve member is biased toward the front and closed position for sealing engagement with the outer valve seat portion, to become an open position spaced rearward from the outer valve seating A member and
The valve member
When move toward selfish forward the closed stop position from the open position, enters into the valve opening, a guide member having a guide portion valve member is guided so as to該継hand body coaxially,
An annular seal member coaxial with the joint body and attached to the rear surface of the guide member;
A cylindrical support member attached to the rear surface of the seal member and having a cylindrical portion extending rearward adjacent to the inner peripheral surface of the joint body, the cylinder fixing the seal member between the guide member and the guide member possess a Jo support member,
When the valve member is displaced back and forth in the axial direction, the seal member slides on the inner peripheral surface of the cylindrical joint body, and the inner periphery of the cylindrical joint body on which the seal member slides. A concave portion is provided on the surface, and the cylindrical portion of the cylindrical support member is provided with a communication opening that penetrates the cylindrical portion in the radial direction and communicates the concave portion with the inside of the cylindrical portion, A female joint member in which the front side and the rear side of the annular seal member are communicated with each other through the recess and the communication opening when the valve member is displaced back and forth in the axial direction . The valve device is an inner valve seat portion provided at a radially inner position of the outer valve seat portion and coaxial with the joint body, and has an annular valve opening between the outer valve seat portion and the outer valve seat portion. Having an inner valve seat defining,
  The annular seal member has an annular outer engagement portion that is coaxial with the joint body and is attached to the rear surface of the guide member, and an annular inner engagement portion that extends radially inward from the outer engagement portion. When the valve member moves forward from the open position and approaches the closed position, the outer and inner engagement portions engage with the corresponding outer and inner valve seat portions, and are elastically deformed while the outer and inner engagement portions are engaged. It is designed to sealingly engage the valve seat,
  2. The female joint member according to claim 1, wherein the cylindrical support member is configured to fix the outer engagement portion between the guide member. The annular seal member has an annular extension portion whose inner engagement portion extends radially inward from the guide portion of the guide member, the valve member reaches the closed position, and the outer engagement portion is the outer valve seat portion. When the annular engagement portion is engaged with the inner valve seat portion, the inner engagement portion is elastically deformed so as to bend backward by the engagement of the annular extension portion and the inner valve seat portion is sealed. The female joint member according to claim 2 , wherein the female joint member is configured as described above. The outer valve seat portion is coaxial with the joint body, and has an annular inclined surface that decreases in diameter toward the front, and extends forward from the front end edge of the annular inclined surface coaxially with the joint body. A cylindrical guide surface that defines,
The guide member of the valve member has a locking portion whose diameter increases from the rear end of the guide portion entering the valve opening toward the rear, and the locking portion is set to the closed position. The female joint member according to claim 2 or 3 , wherein the female joint member is configured to substantially abut against the annular inclined surface of the outer valve seat portion in a state. The annular seal member is bonded to the cylindrical support member and the guide member at the outer engagement portion, and the inner engagement portion is not bonded to the cylindrical support member and the guide member. Item 4. The female joint member according to Item 2 or 3 . The communication openings of the cylindrical portion of the cylindrical support member are provided as a plurality of communication holes provided at intervals in the circumferential direction of the cylindrical portion and penetrating the cylindrical portion in the radial direction. The female joint member according to claim 1 . The joint body has a fluid passage tube threadedly engaged at its rear end and extending forward in the joint body;
The fluid passage pipe has an outer periphery that forms a valve member housing space for housing the valve member so as to be displaceable back and forth in the axial direction between an inner circumferential surface defining the fluid passage and the inner circumferential surface of the joint body. The valve member at a position rearward of the inner valve seat portion, the inner valve seat portion closing the front end of the fluid passage of the fluid passage pipe and forming an annular valve opening with the outer valve seat portion A communication hole for communicating the storage space and the fluid passage of the fluid passage pipe;
When the valve member is displaced back and forth in the axial direction, the inner engagement portion of the seal member slides on the outer peripheral surface of the fluid passage pipe, and the inner engagement portion of the seal member is The female joint member according to claim 1, wherein a concave portion is provided on the outer peripheral surface that slides .

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