JP2009281396A - Plug and socket sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug and socket sealing structure for maintaining sealing performance between a plug and a socket connected to each other over a long period. <P>SOLUTION: The sealing structure includes a sliding cylinder 26 slidably provided in a body part 21, and a sealing member 29 provided at the front end of the sliding cylinder 26, wherein the sealing member 29 is pushed against an abutting portion 14a formed at the front end face of the plug 10 to connect the inside of a gas passage 12 of the plug 10 to the inside of the sliding cylinder 26 in a sealing condition. A sub sealing part 29C is integrally provided on the inner periphery of the sealing member 29. An annular protruded portion 29b is formed at the front end of the outer peripheral face of the sub sealing part 29C. The annular protruded portion 29b is thrust against and connected to the inner peripheral face of the gas passage 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sealing structure for sealing between a plug and a socket connected to each other.

  As a conventional connection structure of this type, for example, there is one described in Patent Document 1 below. As shown in FIG. 9, the connection structure described in this publication is for connecting a plug 1 and a socket (only a slide cylinder 2 is shown) of a quick joint defined in Japanese Industrial Standard (JIS S2135). . When connecting the plug 1 and the socket, first, the plug 1 is inserted into a main body (not shown) of the socket to a predetermined mounting position. Then, the plug 1 hits the slide cylinder 2 provided inside the main body. Then, the slide cylinder 2 is moved against the urging force of a coil spring (not shown). A seal member 3 is provided at the distal end portion of the slide cylinder 2, and this seal member 3 is pressed against the distal end surface of the plug 1 by the urging force of the urging means. Thereby, the inside of the plug 1 and the inside of the slide cylinder 2 are connected in a sealed state. In particular, in this conventional example, a tapered surface 1a and an annular flat surface 1b are provided on the tip surface of the plug 1, and the seal member 3 is pressed against these two surfaces (contact portions) 1a and 1b. Therefore, the gap between the plug 1 and the slide cylinder 2 can be more reliably sealed.

JP-A-11-210948

  However, in the above conventional connection structure, both the tapered surface 1a and the annular flat surface 1b against which the seal member 3 is pressed are formed on the distal end surface of the plug 1 and are exposed to the outside. For this reason, the taper surface 1a and the annular plane 1b are highly likely to be damaged. When the taper surface 1a and the annular flat surface 1b are damaged, the sealing performance by the seal member 3 between the plug 1 and the slide tube 2 may be deteriorated.

In order to solve the above problems, the present invention has a plug having a cylindrical portion at the distal end and an annular contact portion formed on the distal end surface of the cylindrical portion, and the cylindrical portion of the plug can be inserted and removed. A cylindrical main body part inserted into the slide body, a slide cylinder provided on the inner periphery of the main body part so as to be movable in the axial direction thereof, an urging means for urging the slide cylinder toward the plug, and the slide When the cylindrical part is inserted into the main body part to a predetermined mounting position when connecting to a socket having an annular sealing member provided at the tip part located on the plug side of the cylinder, the cylindrical part becomes the slide cylinder. Is moved against the urging force of the urging means, and the contact portion is pressed against the seal member by the urging force of the urging means, whereby the cylindrical portion and the slide cylinder are sealed. Connected in the state In the sealing structure of the socket and the socket, the cylindrical portion and the slide tube are sealed in a state where the outer peripheral surface is in annular contact with the inner peripheral surface of the cylindrical portion at the tip of the slide tube. An inner peripheral side sealing member to be connected is provided.
In this case, the front end portion of the outer peripheral surface of the inner peripheral side sealing member positioned on the cylindrical portion side is brought into press contact with the inner peripheral surface of the cylindrical portion, and the inner peripheral seal positioned rearward from the press contact portion. It is desirable that the outer peripheral surface of the member is separated from the inner peripheral surface of the plug with a gap having a predetermined size inward in the radial direction.
By setting the outer diameter of the portion located behind the pressing contact portion of the inner circumferential side seal member to be smaller than the inner diameter of the cylindrical portion, the outer circumferential surface of the inner circumferential side sealing member becomes the inner circumference of the cylindrical portion. It is desirable to be spaced radially inward from the surface.
The inner peripheral seal member may be formed integrally with the seal member, or may be formed separately from the seal member.

  According to this invention having the above-described characteristic configuration, the outer peripheral surface of the inner peripheral side seal member is pressed against the inner peripheral surface of the cylindrical portion, thereby sealing between the cylindrical portion and the slide cylinder. Since the inner peripheral surface of the cylindrical portion is surrounded by the peripheral wall portion constituting the cylindrical portion, the possibility of being damaged is significantly lower than that of the tip surface. Therefore, the sealing state between the cylindrical portion and the slide cylinder by the inner peripheral side sealing member can be maintained well over a long period of time.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 3 show a first embodiment of the present invention. First, the plug 10 and the socket 20 to be connected will be described. The plug 10 and the socket 20 have a shape defined by Japanese Industrial Standard (JIS S2135). That is, as shown in FIG.1 and FIG.2, the plug 10 has the cylindrical part 11 extended straightly in the front-end | tip part. The inside of the cylindrical portion 11 is a gas passage 12. At least the tip of the gas passage 12 is formed in a circular cross section. Inside the gas passage 12, a valve body (not shown) for opening and closing the gas passage 12 is provided so as to be slidable between a closed position arranged on the front end side and an open position arranged on the rear end side. ing. The valve body is biased from the open position to the closed position by biasing means including a coil spring or the like. An engagement groove 13 having a substantially trapezoidal cross section is formed in an annular shape on the outer peripheral surface of the cylindrical portion 11. The engagement groove 13 is disposed at a position spaced apart from the front end surface of the cylindrical portion 11 by a predetermined distance. A projecting portion 14 that extends in an annular shape so as to surround the opening of the gas passage 12 is formed on the distal end surface of the cylindrical portion 11. An outer peripheral surface of the protruding portion 14 is a contact portion 14a. The abutting portion 14a is formed by a tapered surface (abutting portion), that is, a conical surface whose generating line is a straight line. The abutting portion 14a may be configured by a convex curved surface that is a convex curve in which the generatrix bulges outward. The front end surface of the protruding portion 14 is an annular flat surface 14 b that is a plane orthogonal to the axis of the cylindrical portion 11. The annular plane 14 b intersects the inner peripheral surface of the gas passage 12.

  Next, the socket will be described. As shown in FIGS. 1 and 2, the socket 20 has a main body 21. The main body portion 21 has a cylindrical shape, an end portion (hereinafter referred to as a front end portion) on the plug 10 side is opened, and an end portion on the opposite side (hereinafter referred to as a rear end portion) is closed by a bottom portion 21a. ing.

  A plurality of through holes 21b are formed in the peripheral wall portion on the distal end side of the main body portion 21 so as to penetrate the main body portion 21 in the radial direction. The plurality of through-holes 21b are arranged at equal intervals in the circumferential direction on a single circumference that is separated from the distal end surface of the main body 21 by a predetermined distance. A spherical body 22 made of steel or the like is inserted into the through hole 21b so as to be movable in the axial direction of the through hole 21b, that is, in the radial direction of the main body portion 21. The outer diameter of the spherical body 22 is larger than the thickness of the peripheral wall portion of the main body portion 21 in the portion where the through hole 21b is formed. Therefore, when the outer end of the sphere 22 is positioned on the outer peripheral surface of the main body 21, the inner end of the sphere 22 protrudes inward from the inner peripheral surface of the main body 21. Conversely, when the inner end of the sphere 22 is positioned on the inner peripheral surface of the main body 21, the outer end of the sphere 22 protrudes outward from the outer peripheral surface of the main body 21.

  As shown in FIG. 2, when the cylindrical portion 11 of the plug 10 is inserted into the main body portion 21 from its opening portion to a predetermined mounting position, the annular groove 13 faces the through hole 21b. Then, the spherical body 22 can move inward in the radial direction of the main body portion 21, and the inner end portion of the spherical body 22 enters the annular groove 13. Thereby, the cylindrical part 11 is connected to the main body part 21 so as not to move in the axial direction. Moreover, in this connected state, the rod 21 c formed at the bottom 21 a of the main body 21 enters the gas passage 12. The rod 21c moves the valve body provided in the gas passage 12 from the closed position to the open position against the urging force of the urging means. As a result, the gas passage 12 is opened, and gas flows from the gas passage 12 into the main body portion 21 via a slide cylinder 26 described later. The gas that has flowed into the main body 21 is supplied to a gas device (not shown) via a joint 23 rotatably provided on the bottom 21a and a gas pipe (not shown) connected to the joint 23. Is done. When the spherical body 22 is moved outward in the radial direction of the main body portion 21 to escape from the annular groove 13, the cylindrical portion 11 can be moved in the axial direction of the main body portion 21 and can escape from the main body portion 21. When the cylindrical portion 11 is escaped from the main body portion 21, the valve body in the gas passage 12 is moved from the open position to the closed position by the urging means, and the gas passage 12 is closed.

Some plugs are not provided with a valve body in the gas passage 12. In the case of a socket connected to such a plug, the rod 21c is not necessary, but the socket 20 is used for both the plug with and without the valve body in the gas passage 12. It is desirable to provide the rod 21c so that it is possible. In a type of plug in which no valve element is provided in the gas passage 12, an on-off valve that is manually opened and closed is provided on the upstream side of the plug.

  As shown in FIGS. 1 and 2, an operation cylinder 24 is slidably provided at the distal end of the outer peripheral surface of the main body 21. On the inner peripheral surface of the operation cylinder 24, a small diameter hole portion 24a is formed on the rear end side, a large diameter hole portion 24b is formed on the front end side, and a tapered hole portion 24c is formed therebetween. The inner diameter of the small diameter hole 24 a is substantially the same as the outer diameter of the main body 21. The distal end portion of the main body portion 21 is inserted into the small diameter hole portion 24a so as to be relatively slidable. When the small diameter hole portion 24 a faces the through hole 21 b, the inner peripheral surface of the small diameter hole portion 24 a abuts against the outer end portion of the sphere 22. As a result, the inner end of the sphere 22 is protruded inward from the inner peripheral surface of the main body 21. The inner diameter of the large-diameter hole 24b is such that the sphere 22 is in the radial direction of the main body 21 until the inner end of the sphere 22 is positioned on the inner peripheral surface of the main body 21 or slightly outside the inner peripheral surface. Even if it moves to the outside, the size is set so as to allow the outer end of the sphere 22 to protrude from the outer peripheral surface of the main body 21. Therefore, when the large-diameter hole portion 24 b faces the through-hole 21 b, the outer end portion of the sphere 22 can protrude outward from the outer peripheral surface of the main body portion 21.

  The operation cylinder 24 is urged toward the distal end side of the main body 21 by a coil spring 25. The operation cylinder 24 may be urged by an elastic member other than the coil spring 25. As shown in FIG. 1, when the plug 10 is not connected to the socket 20, the inner peripheral surface of the tapered hole portion 24 c is in contact with the outer end portion of the sphere 22 protruding from the outer peripheral surface of the main body portion 21. As a result, the operation cylinder 24 is stopped. Hereinafter, the position of the operation cylinder 24 at this time is referred to as a release position. As shown in FIG. 2, when the plug 10 is connected to the socket 20, the inner peripheral surface of the tapered hole portion 24 c is formed on the annular projecting portion 21 e formed at the distal end portion of the outer peripheral surface of the main body portion 21. It is struck by the urging force. Thereby, the operation cylinder 24 is stopped. Hereinafter, the position of the operation cylinder 24 at this time is referred to as a connection position. When the operation cylinder 24 is located at the connection position, the inner peripheral surface of the small-diameter hole 24a hits the outer end of the sphere 22 and the inner end of the sphere 22 is moved inward from the inner peripheral surface of the main body 21. It is protruding.

  A slide cylinder 26 is provided inside the main body 21 so as to be movable in the axial direction of the main body 21. The slide cylinder 26 is biased toward the distal end side of the main body 21 by a coil spring (biasing means) 27. The slide cylinder 26 may be biased by an elastic member other than the coil spring 27. A protruding portion 26 a is formed at the rear end portion of the outer peripheral surface of the slide cylinder 26. As shown in FIG. 1, the protrusion 26 a is abutted against the protrusion 21 d formed on the inner peripheral surface of the main body 21 by the biasing force of the coil spring 27. When the protruding portion 26 a hits the protruding portion 21 d, the slide cylinder 26 can no longer move to the distal end side of the main body portion 21. Hereinafter, the position of the slide cylinder 26 at this time is referred to as a standby position. As shown in FIG. 2, when the plug 10 is inserted into the main body 21 to the mounting position, the slide cylinder 26 is moved backward to a predetermined position by the cylindrical portion 11 via a seal member 29 described later. Hereinafter, the position of the slide cylinder 26 at this time is referred to as a connection position. The slide cylinder 26 can move rearward beyond the connection position, but actually does not move beyond the connection position.

  A cylindrical guide member 28 is fixed to the tip of the slide cylinder 26. The guide member 28 is disposed concentrically with the slide cylinder 26. The outer diameter of the distal end portion of the guide member 28 is substantially the same as the inner diameter of the main body portion 21, and the distal end portion of the guide member 28 is slidably fitted to the inner peripheral surface of the main body portion 21. Therefore, the slide cylinder 26 is slidably provided on the inner peripheral surface of the main body 21 via the guide member 28. The slide cylinder 26 may be slidable directly on the inner peripheral surface of the main body 21.

  When the slide cylinder 26 is located at the standby position, the outer peripheral surface of the distal end portion of the guide member 28 faces the through hole 21b and is in contact with the inner end portion of the sphere 22. Therefore, at this time, the outer end of the sphere 22 protrudes outward from the outer peripheral surface of the main body 21. On the other hand, when the slide cylinder 26 moves to the coupling position, the guide member 28 moves to the rear end side from the through hole 21b. As a result, the sphere 22 can move inward such that the inner end of the sphere 22 protrudes inward from the inner peripheral surface of the main body 21.

  An annular space is formed between the outer peripheral surface of the distal end portion of the slide cylinder 26 and the inner peripheral surface of the distal end portion of the guide member 28. An annular seal member 29 is inserted and fixed in the annular space. The seal member 29 is made of a resin such as rubber or other material having elasticity and hermeticity, and has a main seal portion (seal member) 29A on the outer peripheral side and a connecting portion 29B on the inner peripheral portion of the main seal portion 29A. And an auxiliary seal part (inner peripheral side seal member) 29C provided integrally therewith. The main seal portion 29A, the connecting portion 29B, and the sub seal portion 29C are all formed in an annular shape and are arranged concentrically with each other.

  A contact surface 29a having a diameter increasing toward the distal end is formed on the inner peripheral side portion of the distal end of the main seal portion 29A. The contact portion 29a may be configured by a tapered surface whose bus is a straight line, or may be configured by a convex curved surface whose bus is a convex curve. When the cylindrical portion 11 is inserted into the main body portion 21 by a predetermined distance from the mounting position to a position in front, the contact surface 29a abuts against the contact portion 14a. Therefore, in a state where the cylindrical portion 11 is inserted to the mounting position, the contact surface 29 a is pressed and brought into contact with the contact portion 14 a by the urging force of the coil spring 27. As a result, the space between the distal end surface of the cylindrical portion 11 and the distal end surface of the slide cylinder 26 is sealed, and in this state, the gas passage 12 and the inside of the slide cylinder 26 are connected. That is, the gas passage 12 and the inside of the slide cylinder 26 communicate with each other. Accordingly, the gas supplied from the gas passage 12 once enters the slide cylinder 26, passes through this, and then flows into the rear end portion inside the main body portion 21. Thereafter, as described above, the gas is supplied to the gas equipment through the joint 23 and the gas pipe. The main seal portion 29 </ b> A may be annularly pressed and contacted with an annular plane located outside the protruding portion 14 in the tip surface of the cylindrical portion 11.

  The sub seal portion 29C has a cylindrical shape, and is arranged such that at least the tip of the sub seal portion 29C enters the inside of the gas passage 12 when the abutment surface 29a abuts against the abutment portion 14a. . In particular, in this embodiment, the distal end portion of the sub seal portion 29C is disposed in front of the distal end surface of the main seal portion 29A.

    An annular protrusion (pressing contact portion) 29b is provided at the distal end portion of the secondary seal portion 29C, that is, when the contact surface 29a is in contact with the contact portion 14a, the distal end portion of the secondary seal portion 29C that enters the gas passage 12. Is formed. The outer diameter of the annular projecting portion 29 b is larger than the inner diameter of the gas passage 12. Therefore, in a state where the contact surface 29a hits the contact portion 14a, the annular projecting portion 29b is brought into annular contact with the inner peripheral surface of the gas passage 12 by its own elasticity and the elasticity of the sub seal portion 29C. Thereby, the space between the cylindrical portion 11 and the slide cylinder 26 is sealed. Therefore, in this connection structure, since both the main seal portion 29A and the sub seal portion 29C seal between the cylindrical portion 11 and the slide tube 26, the gas passage 12 and the inside of the slide tube 26 are highly sealed. Connected with.

  The outer diameter of the sub seal portion 29 </ b> C located on the rear side of the slide cylinder 26 from the annular protrusion 29 b is set to be smaller than the inner diameter of the gas passage 12. Therefore, the outer peripheral surface of the sub seal portion 29 </ b> C is spaced inward from the inner peripheral surface of the gas passage 12 by the difference between the radius and the radius of the gas passage 12. However, the outer diameter of the sub seal portion 29C is not necessarily smaller than the inner diameter of the gas passage 12, and may be equal to the inner diameter of the gas passage 12 over the entire length of the sub seal portion 29C. Alternatively, the gas passage 12 may have a larger diameter over the entire length of the sub seal portion 29C. In such a case, the annular protrusion 29b is not formed, and the entire outer peripheral surface of the sub seal portion 29C facing the inner peripheral surface of the gas passage 12 is pressed against the inner peripheral surface of the gas passage 12. It is done.

  The connecting portion 29B comes into contact with the annular flat surface 14b when the contact surface 29a is in press contact with the protruding portion 14. However, the connecting portion 29B may be separated without contacting the annular flat surface 14b.

  Next, a case where the plug 10 and the socket 20 having the above configuration are attached and detached will be described. Now, as shown in FIG. 1, it is assumed that the plug 10 is removed from the socket 20. At this time, the operation cylinder 24 is located at the release position, and the slide cylinder 26 is located at the standby position. When the cylindrical portion 11 of the plug 10 is relatively inserted into the main body portion 21 of the socket 20 from the opening at the tip thereof, the sub seal portion 29C first enters the gas passage 12, and then the contact surface 29a hits the contact portion 14a. . As shown in FIG. 2, when the cylindrical portion 11 is further inserted to the mounting position, the slide cylinder 26 is moved from the standby position to the coupling position against the urging force of the coil spring 27 by the cylindrical portion 11. Then, the spherical body 22 is pushed inward in the radial direction of the main body portion 21 through the inner peripheral surface of the tapered hole portion 24c of the operation cylinder 24 by the urging force of the coil spring 25, moves in the same direction, and enters the engaging groove 13. . In addition, at this time, the operation cylinder 24 is moved from the release position to the connection position by the coil spring 25, and the spherical body 22 cannot move radially outward. Therefore, the cylindrical portion 11 and the main body portion 21 are connected so as not to be detached, and as a result, the plug 10 and the socket 20 are connected so as not to be detached.

  In a state in which the plug 10 and the socket 20 are connected, the contact surface 29a of the main seal portion 29A is not only in annular contact with the contact portion 14a of the plug 10, but also the annular projecting portion of the sub seal portion 29C. 29 b is in annular pressure contact with the inner peripheral surface of the gas passage 12. Therefore, the passage hole 12 and the inside of the slide cylinder 26 are connected in an airtightly sealed state.

  Here, since the contact portion 14a is exposed to the outside, there is a high possibility that the contact portion 14a will be damaged by collision with another article. However, since the inner peripheral surface of the gas passage 12 is located inside the wall portion that forms the cylindrical portion 11, the possibility of being damaged is significantly lower than that of the contact portion 14a. Therefore, the sealing state between the plug 10 and the socket 20 can be maintained in a good state over a long period of time by bringing the annular protrusion 29b of the sub seal portion 29C into press contact with the inner peripheral surface of the gas passage 12.

  In particular, in this embodiment, since the outer diameter of the sub seal portion 29C is smaller than the inner diameter of the gas passage 12 except for the annular projecting portion 29b, the sealed state can be maintained in a better state. . That is, when another object collides with the annular plane 14b, particularly in the vicinity of the gas passage 12, projections may be formed on the inner surface of the gas passage 12 near the annular plane 14b. In such a case, if the entire outer peripheral surface of the sub seal member 29C is set so as to be in pressure contact with the inner peripheral surface of the gas passage 12, the contact portion with the protrusion of the sub seal member 29C and the vicinity thereof are The protrusion may be elastically deformed radially inward of the gas passage 12, and a gap may be formed between the protrusion and the sub seal member 29C. As a result, the sealing performance by the sub seal member 29C may be reduced. However, if the outer diameter of the rear end portion of the secondary seal portion 29C located on the rear end side of the annular projecting portion 29b is made smaller than the inner diameter of the gas passage 12, the protrusion comes into contact with the outer peripheral surface of the secondary seal member 29C. Can be prevented. Therefore, the annular protrusion 29 b can be reliably brought into contact with the inner peripheral surface of the gas passage 12. Therefore, it is possible to prevent the sealing performance of the sub seal member 29C from being lowered.

  When the operation cylinder 24 is moved from the connection position to the release position against the biasing force of the coil spring 25 in a state where the plug 10 and the socket 20 are connected, the sphere 22 can move outward in the radial direction of the main body 21. become. That is, it is possible to escape from the engagement groove 13. Therefore, the plug 10 can be extracted from the main body 21. When the plug 10 is extracted, the slide cylinder 26 is moved from the coupling position to the standby position by the coil spring 27 accordingly. When the slide cylinder 26 moves to the standby position, the sphere 22 cannot move radially inward. In addition, the operation cylinder 24 is positioned at the release position by the sphere 22. Thereby, the plug 10 and the whole socket 20 are returned to the state shown in FIG.

  Next, another embodiment of the present invention will be described. In the following embodiment, only the configuration different from the above embodiment will be described, and the same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted.

  FIG. 4 shows a main part of the second embodiment of the present invention. In this embodiment, an annular recess 15 is formed at the tip of the gas passage 12 that intersects the annular flat surface 14b of the inner peripheral surface. Therefore, the outer peripheral surface of the sub seal member 29C is further separated from the inner peripheral surface of the gas passage 12 by the width of the annular recess 15 (the width in the radial direction of the main body portion 21) than in the above embodiment. Therefore, even if a protrusion is formed at the tip of the inner peripheral surface of the gas passage 12, it can be more reliably prevented that the protrusion hits the outer peripheral surface of the sub seal portion 29C. When the annular recess 15 is formed, the outer diameter of the portion other than the annular projecting portion 29b of the sub seal portion 29C may be made substantially the same as the inner diameter of the gas passage 12.

  FIG. 5 shows a third embodiment of the present invention. In this embodiment, two seal members 31, 32 that are separate from each other are used. One seal member 31 corresponds to the main seal portion 29A of the above-described embodiment, and fits into an annular space between the outer peripheral surface of the slide tube 26 and the inner peripheral surface of the guide member 28. It is fixed. A contact surface 31 a is formed on the inner peripheral portion of the distal end surface of the seal member 31. The abutment surface 31a corresponds to the abutment surface 29a of the above-described embodiment, and contacts the abutment portion 14a of the cylindrical portion 11 in an annular shape. The other seal member (inner peripheral side seal member) 32 corresponds to the sub seal portion 29 </ b> C, and is fitted and fixed to the inner peripheral surface of the distal end portion of the slide cylinder 26 in an airtight manner. An annular protrusion 32 a is formed at the tip of the seal member 32. The annular projecting portion 32 a corresponds to the annular projecting portion 29 b of the above embodiment, and is in press contact with the inner peripheral surface of the gas passage 12. Of the seal member 32, the outer diameter of at least the portion facing the inner peripheral surface of the gas passage 12 on the rear end side from the annular protrusion 32 a is set smaller than the inner diameter of the gas passage 12.

  6 and 7 show a fourth embodiment of the present invention. In this embodiment, gas is allowed to flow from the socket 20 toward the plug 10, and both end portions of the main body portion 21 are opened. A joint 23 is airtightly fitted and fixed to the rear end opening of the main body 21. A primary gas pipe (not shown) is connected to the joint 23. And gas is supplied in the main-body part 21 from a primary side gas pipe. A tapered valve seat 21f having a small diameter toward the distal end is formed on the inner peripheral surface of the main body 21.

  The slide tube 26 has a rear end portion closed by a bottom portion 26b. A seal member 33 made of an O-ring or the like is provided in a portion of the outer peripheral surface of the slide cylinder 26 located in the vicinity of the bottom portion 26b. The seal member 33 is seated on the valve seat 21 f by a coil spring 27 and another coil spring 34. When the seal member 33 is seated on the valve seat 21f, the portion upstream of the valve seat 21f and the downstream portion of the main body 21 are blocked by the slide cylinder 26. That is, the inside of the main body 21 is closed by the slide cylinder 26. Therefore, in this embodiment, the slide cylinder 26 is used as a valve body. Note that when only one urging force of the coil spring 27 and the coil spring 34 is sufficient as the urging force for seating the seal member 33 on the valve seat 21f, only one of them may be used.

  Similar to the above-described embodiment, the slide cylinder 26 can move between the standby position and the coupling position, and the position of the slide cylinder 26 when the seal member 33 is seated on the valve seat 21f is the standby position. ing. Of course, the connection position is a position when the slide cylinder 26 is moved by the cylindrical portion of the plug 10 inserted to the mounting position.

  The slide cylinder 26 is formed with a plurality of passage holes 26c penetrating the peripheral wall portion. As shown in FIG. 7, when the slide cylinder 26 is located at the coupling position, the passage hole 26c is such that at least a part of the passage hole 26c is located on the rear end side of the valve seat 21f (on the upstream side in the gas flow direction). ). Therefore, when the slide cylinder 26 is located at the coupling position, the gas that has flowed into the rear end portion inside the main body portion 21 flows into the slide cylinder 26 through the passage hole 26c. Further, when the slide cylinder 26 is located at the coupling position, gas also flows between the inner peripheral surface of the main body 21 and the outer peripheral surface of the slide cylinder 26 on the downstream side of the valve seat 21f. Therefore, a seal member 35 that seals between the outer peripheral surface of the guide member 28 and the inner peripheral surface of the main body 21 is provided on the guide member 28 that is located downstream of the valve seat 21f.

  In this embodiment, the guide member 28 is provided at the front end portion of the slide cylinder 26 via a cylindrical intermediate member 36, and an annular shape formed between the guide member 28 and the intermediate member 36. A seal member 29 is inserted and fixed in the space. In this embodiment, since gas flows from the socket 20 to the plug 10, no valve body is provided in the gas passage 12. Therefore, the main body 21 is not provided with the rod 21c.

  FIG. 8 shows a fifth embodiment of the present invention. This embodiment is a modification of the embodiment shown in FIGS. 6 and 7, and, like the third embodiment, instead of the seal member 29, two seal members 31, which are separate from each other, 32 is provided. The seal member 31 is inserted and fixed in an annular space formed between the guide member 28 and the intermediate member 36. The seal member 32 is inserted and fixed to the inner peripheral surface of the distal end portion of the slide cylinder 26. Other configurations are the same as those of the fourth embodiment.

It is sectional drawing which shows 1st Embodiment of this invention in the state before a plug and a socket are connected. It is sectional drawing which shows the same embodiment in the state after a plug and a socket were connected. It is an expanded sectional view which shows the principal part of the embodiment. It is an expanded sectional view which shows the principal part of 2nd Embodiment of this invention. It is sectional drawing which shows 3rd Embodiment of this invention. It is sectional drawing which shows 4th Embodiment of this invention in the state before a plug and a socket are connected. It is sectional drawing which shows the same embodiment in the state after a plug and a socket were connected. It is sectional drawing which shows 5th Embodiment of this invention. It is sectional drawing which shows the principal part of the conventional example of the connection structure of a plug and a socket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plug 11 Cylindrical part 14a Contact part 21 Main part 26 Slide cylinder 27 Coil spring (biasing means)
29A Main seal (seal member)
29C Sub seal part (inner circumference side seal member)
29b Annular protrusion (pressing contact)
31 Seal member 32 Seal member (inner peripheral side seal member)

Claims (5)

A plug having a cylindrical portion at the distal end and an annular contact portion formed on the distal end surface of the cylindrical portion, a cylindrical main body portion into which the cylindrical portion of the plug is detachably inserted, and the main body portion A slide cylinder provided on the inner periphery of the slide cylinder so as to be movable in the axial direction thereof, a biasing means for biasing the slide cylinder toward the plug, and a tip of the slide cylinder located on the plug side. When connecting the socket having the annular seal member, when the cylindrical portion is inserted into the main body portion to a predetermined mounting position, the cylindrical portion moves the slide cylinder against the urging force of the urging means. In addition, the contact portion is pressed against the seal member by the urging force of the urging means, whereby the cylindrical portion and the slide cylinder are connected in a sealed state with a plug and socket sealing structure In
An inner peripheral side sealing member that connects the cylindrical portion and the slide tube in a sealed state is provided at the distal end portion of the slide tube so that the outer peripheral surface is annularly pressed into contact with the inner peripheral surface of the cylindrical portion. A plug and socket sealing structure characterized in that The tip of the outer peripheral surface of the inner peripheral side seal member, which is positioned on the cylindrical portion side, is brought into press contact with the inner peripheral surface of the cylindrical portion, and the outer periphery of the inner peripheral side seal member positioned behind the press contact portion. 2. The plug / socket sealing structure according to claim 1, wherein the surface is separated from the inner peripheral surface of the plug by a gap of a predetermined size on the radially inner side. The outer diameter of the portion located behind the pressing contact portion of the inner circumferential side seal member is made smaller than the inner diameter of the cylindrical portion, so that the outer circumferential surface of the inner circumferential side sealing member is the inner circumference of the cylindrical portion. The plug / socket sealing structure according to claim 2, wherein the plug / socket sealing structure is spaced radially inward from the surface. The plug and socket sealing structure according to any one of claims 1 to 3, wherein the inner peripheral side sealing member is formed integrally with the sealing member. The plug and socket sealing structure according to any one of claims 1 to 3, wherein the inner peripheral side sealing member is formed separately from the sealing member.

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