JP5204621B2 - Plug and socket sealing structure - Google Patents

Description

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

  As a conventional sealing structure of this type, for example, there is one described in Patent Document 1 below. As shown in FIG. 7, the sealing structure described in this publication is for sealing between a plug 1 of a quick joint and a slide cylinder 2 of a socket specified in Japanese Industrial Standard (JIS S 2135). It is. The plug 1 is provided with a cylindrical portion 1a at the tip, and a tapered surface (contact portion) 1b and an annular flat surface (contact portion) 1c are formed on the tip surface of the cylindrical portion 1a. The socket has a cylindrical main body (not shown), and a slide cylinder 2 is slidably provided inside the main body. The slide cylinder 2 is urged toward the distal end side (plug 1 side; left side in FIG. 7) by the urging means. A seal member 3 made of an elastic material is provided at the tip of the slide cylinder 2.

  When connecting the plug 1 and the socket, the cylindrical portion 1a of the plug 1 is inserted into the main body of the socket. Then, the tapered surface 1 b and the annular flat surface 1 c of the plug 1 abut against the seal member 3. When the plug 1 is further inserted, the slide cylinder 2 is pressed and moved to the right in FIG. 7 against the urging force of the urging means. When the plug 1 is inserted to the connection position, the plug 1 is locked to the main body portion so as not to escape, and the plug 1 and the socket are connected. In the connected state, the seal member 3 is pressed and brought into contact with the tapered surface 1b and the annular flat surface 1c by the biasing means. As a result, the end portion between the cylindrical portion 1a and the slide tube 2 is sealed.

JP-A-11-210948

  In the above conventional sealing structure, it is desired to further improve the sealing performance between the cylindrical portion 1a and the tip portion of the slide cylinder 2. As one method for meeting such a demand, it is conceivable to increase the contact pressure of the sealing member 3 against the plug 1 by increasing the biasing force of the biasing means. However, when the urging force of the urging means is increased, the plug 1 must be inserted into the main body of the socket with a large force, resulting in a problem that the operability is deteriorated. Moreover, since the seal member 3 is greatly elastically deformed, there is a problem that the seal member 3 is deteriorated at an early stage. For this reason, the request | requirement of improving a sealing performance further was not able to fully respond.

In order to solve the above-described problem, the present invention provides a plug having a cylindrical portion at the tip, and an annular contact portion formed at a location spaced from the inner peripheral edge of the tip surface of the cylindrical portion toward the outer periphery. A cylindrical main body portion in which the cylindrical portion of the plug is removably inserted, a slide cylinder provided on the inner periphery of the main body portion so as to be movable in the axial direction, and the slide cylinder toward the plug side In order to connect an urging means for urging and a socket having a sealing member made of an elastic material provided in an annular shape at a tip portion located on the plug side of the slide cylinder, the cylindrical portion is connected to the main body portion. When the plug is inserted to a predetermined connection position, the seal member is pressed into contact with the abutting portion by the urging force of the urging means, whereby the plug between the cylindrical portion and the slide cylinder is sealed. The sealing structure between the socket and socket The urging means is formed in an annular shape by an elastic material at the distal end portion of the slide cylinder located on the inner peripheral side of the seal member, and the outer peripheral surface is at the intersection of the distal end surface and the inner peripheral surface of the cylindrical portion. An inner peripheral side sealing member that is pressed into contact with an annular shape and thereby seals between the cylindrical portion and the slide cylinder is provided, and a distal end portion located on the cylindrical portion side of the inner peripheral side sealing member is provided. The distal end portion of the inner circumferential side seal member is a free end portion that is not constrained by the slide cylinder so that the diameter of the inner circumferential side seal member can be elastically expanded and contracted, and an outer peripheral surface located on the distal end side of the slide cylinder of the free end portion is It is characterized by being brought into press contact with the intersection between the tip surface of the cylindrical portion and the inner peripheral surface.
In this case, it is desirable that the seal member and the inner peripheral side seal member are formed separately from each other and from different materials.
In addition, it is desirable that a tapered surface is formed at the intersection between the tip surface and the inner peripheral surface of the plug, and the outer peripheral surface of the inner peripheral seal member is pressed and contacted with the tapered surface.

  According to the present invention having the above-described characteristic configuration, the number of sealed portions between the cylindrical portion of the plug and the slide cylinder of the socket is increased by the amount of the sealed portion by the inner peripheral side sealing member. Thereby, the sealing performance between the cylindrical portion and the slide cylinder can be improved. In addition, since the outer peripheral surface of the free end portion of the inner peripheral side seal member is in contact with the intersection of the tip surface of the cylindrical portion and the inner peripheral surface, the gas present inside the inner peripheral side seal member is The circumferential seal member is pressed so as to expand its diameter and is brought into press contact with the intersecting portion. Therefore, it is not necessary to increase the urging force of the urging means in order to make the inner peripheral side sealing member press-contact with the intersecting portion, or even if it is increased, the degree can be reduced. Therefore, the operability when the plug is inserted into the socket is not deteriorated.

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. The plug 10 and the socket 20 of this embodiment have a shape shown in Japanese Industrial Standard (JIS S 2135). That is, the plug 10 has a cylindrical portion 11 that extends straight at the tip thereof. 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 on the front end side and an open position on the rear end side. The valve body is urged from the open position toward the closed position by urging means (not shown) including a coil spring or the like. An engaging groove 13 having a 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. An annular projecting portion 14 and an annular flat surface (contact portion) 15 are formed coaxially with the cylindrical portion 11 on the tip surface of the cylindrical portion 11. The annular projecting portion 14 is arranged to be spaced radially outward from the inner peripheral surface of the gas passage 12 by a predetermined distance. A contact portion 14 a is formed on the outer peripheral surface of the annular projecting portion 14. The contact portion 14a is formed in a tapered shape so as to increase in diameter toward the rear. The annular flat surface 15 is formed as a flat surface that is orthogonal to the axis of the cylindrical portion 11, and is subsequently disposed outside the contact portion 14 a. A tapered surface 16 having a smaller diameter toward the rear is formed at the intersection between the distal end surface of the cylindrical portion 11 and the inner peripheral surface of the gas passage 12. The intersection of the tip surface of the cylindrical portion 11 and the inner peripheral surface of the gas passage 12 may be a ridgeline.

  On the other hand, 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. The inner diameter of the main body portion 21 is substantially the same as the outer diameter of the cylindrical portion 11, and the cylindrical portion 11 is removably inserted into the main body portion 21. When the cylindrical portion 11 is inserted to the predetermined connection position shown in FIG. 2, the cylindrical portion 11 is locked to the main body portion 21 so as not to escape, and the plug 10 and the socket 20 are connected as will be described later. The

  A plurality of through holes 21b are formed in the distal end portion of the peripheral wall portion 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 one circumference that is separated from the tip surface of the main body 21 by a predetermined distance. A sphere 22 made of steel or the like is inserted into the through hole 21b. The outer diameter of the sphere 22 is set to be substantially the same as the inner diameter of the through hole 21b. Accordingly, the sphere 22 is movable in the axial direction of the through hole 21b, that is, in the radial direction of the main body portion 21, but cannot be moved in the axial direction and the circumferential direction of the main body portion 21. Moreover, the outer diameter of the sphere 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 the opening portion to the connection position, the engagement groove 13 faces the through hole 21 b, and the engagement groove 13 is located inside the sphere 22. The edge enters. Thereby, the cylindrical part 11 is latched by the main-body part 21 so that it cannot move to the axial direction. That is, the cylindrical part 11 is connected to the main body part 21 so as not to escape. In this connected state, the rod 21c formed on the bottom 21a of the main body 21 enters the gas passage 12, and the valve provided in the gas passage 12 is opened from the closed position against the urging force of the urging means. Move to position. As a result, the gas passage 12 is opened, and the gas in the gas passage flows into the main body 21 via the slide cylinder 26 described later. The gas that has flowed into the main body 21 is supplied to a gas device (not shown) through a joint 23 rotatably provided at the bottom 21a and a gas pipe (not shown) connected to the joint 23. The When the spherical body 22 is moved outward in the radial direction of the main body portion 21 to be removed from the engagement groove 13, the cylindrical portion 11 can be moved in the axial direction of the main body portion 21, and the cylindrical portion 11 can be extracted from the main body portion 21. Become. When the cylindrical portion 11 is extracted 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 10 are not provided with a valve body in the gas passage 12. In the case of the socket 20 connected to such a plug 10, the rod 21 c is not necessary, but the socket is provided for both the plug 10 with and without the valve body in the gas passage 12. It is desirable to provide the rod 21c so that 20 can be used. 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.

  An operation cylinder 24 is extrapolated 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 that increases in diameter toward the front end side therebetween. 24c is formed. The inner diameter of the small diameter hole portion 24a is substantially the same as the outer diameter of the main body portion 21, and the distal end portion of the main body portion 21 is inserted into the small diameter hole portion 24a so as to be capable of relative sliding. 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 outer peripheral end of the sphere 22 protrudes from the outer peripheral surface of the main body 21 when the inner end of the sphere 22 is positioned on the inner peripheral surface of the main body 21. The size is set to allow. 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, that is, when the cylindrical portion 11 is not inserted to the connection position in the main body portion 21, the inner peripheral surface of the tapered hole portion 24 c is the coil spring 25. It is abutted against the outer end of the sphere 22 by the urging force. 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, that is, when the cylindrical portion 11 is inserted into the main body portion 21 to the connection position, the operation tube 24 is moved by the coil spring 25 to the tip of the main body portion 21. The inner peripheral surface of the tapered hole portion 24 c is abutted against an annular projecting portion 21 e formed on the outer peripheral surface of the tip end portion of the main body portion 21. Thereby, the operation cylinder 24 is stopped. Hereinafter, when the position of the operation cylinder 24 at this time is referred to as an engagement position, and the operation cylinder 24 is located at the engagement position, the inner peripheral surface of the small-diameter hole portion 24a hits the outer end of the sphere 22, and the sphere An inner end portion of 22 protrudes inward from the inner peripheral surface of the main body portion 21.

  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, when the plug 10 is not connected to the socket 20, the protruding portion 26 a is abutted against the protruding portion 21 d formed on the inner peripheral surface of the main body portion 21 by the biasing force of the coil spring 27. ing. When the projecting portion 26a hits the projecting portion 21d, the slide cylinder 26 can no longer move to the distal end side of the main body portion 21 and stops. Hereinafter, the position of the slide cylinder 26 at this time is referred to as a standby position. When the cylindrical part 11 is inserted into the main body part 21 up to a position a predetermined distance before the connection position, the tip surface of the cylindrical part 11 abuts against the slide cylinder 26 via a seal member 29 and an inner peripheral side seal member 31 described later. . Therefore, when the cylindrical portion 11 is inserted to the connection position, the slide cylinder 26 is moved backward to a predetermined position against the urging force of the coil spring 27. 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 distal end portion of the outer peripheral surface 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. As a result, 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 is separated from the through hole 21b toward the rear end side. As a result, the sphere 22 can move inward, and 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 cylinder 28. An annular seal member 29 is inserted and fixed in the annular space. The sealing member 29 is made of a resin such as rubber or other material having elasticity and sealing properties, and has a tip projecting forward from an annular space. A first seal portion 29 a and a second seal portion 29 b are formed at the distal end portion of the seal member 29. The first and second seal portions 29 a and 29 b have an annular shape and are formed concentrically with the slide cylinder 26. In addition, the first seal portion 29a is disposed on the inner side than the second seal portion 29b.

  The first and second seal portions 29a and 29b are substantially inserted into the contact portion 14a and the annular flat surface 15 of the cylindrical portion 11, respectively, when the cylindrical portion 11 is inserted into the main body portion 21 by a predetermined distance from the connection position. Contact at the same time. Therefore, when the cylindrical portion 11 is inserted to the connection position, that is, when the plug 10 is connected to the socket 20, the first and second seal portions 29a and 29b are brought into contact with the contact portion 14a and the annular flat surface 15 by the coil spring 27. Each is pressed. As a result, the tip of the cylindrical portion 11 and the tip of the slide tube 26 are hermetically sealed, and the inside of the plug 10 and the inside of the main body 21 are connected (communication) via the slide tube 26. .

  A holding cylinder 30 is fitted and fixed to the inner peripheral surface of the slide cylinder 26. The outer diameter of the front end portion of the holding cylinder 30 is smaller than the inner diameter of the front end portion of the slide cylinder 26. As a result, an annular space is formed between the inner peripheral surface of the distal end portion of the slide cylinder 26 and the outer peripheral surface of the distal end portion of the holding cylinder 30. The inner circumferential side sealing member 31 is inserted and fixed in this annular space. The inner peripheral seal member 31 is made of a resin such as rubber or other material having elasticity and sealing properties. The material constituting the inner circumferential side seal member 31 may be the same as the material constituting the seal member 29, but it is desirable to use a different material. For example, as the material constituting the inner circumferential side seal member 31, a material superior in deterioration resistance is used although the sealing performance is inferior to the material constituting the seal member 29. This is because the sealing performance can be ensured by the sealing member 29 and the early sealing performance can be prevented by the inner circumferential sealing member 30. Of course, materials having other properties may be used.

  A taper portion (free end portion) 31 a that decreases in diameter toward the front is formed at the distal end portion of the inner circumferential side seal member 31. The taper portion 31a protrudes forward from the annular space. In other words, the slide tube 26 and the holding tube 30 are positioned in front of both front end surfaces. Therefore, the taper portion 31a is a free end portion that is not restrained by the slide tube 26 and the sandwiching tube 30, and can be expanded or contracted by the elasticity of the taper portion 31a itself.

  The outer peripheral surface of the taper part 31a is the third seal part 31b. The third seal portion 31b has a taper angle equal to the taper surface 16 that is the intersection of the tip surface and the inner peripheral surface of the cylindrical portion 11, and the cylindrical portion 11 is connected to the main body portion 21 at a predetermined position. When it is inserted as far as the distance, it will abut against the tapered surface 16. Therefore, when the cylindrical portion 11 is inserted to the connection position, the third seal portion 31 b is pressed against the tapered surface 16 by the biasing force of the coil spring 27. Accordingly, the tip of the cylindrical portion 11 and the slide cylinder 26 are hermetically sealed, and the inside of the plug 10 and the inside of the main body 21 are connected via the slide cylinder 26.

  Here, the third seal portion 31b and the tapered surface 16 are in press contact with the first and second seal portions 29a and 29b almost simultaneously with the contact portion 14a and the annular flat surface 15 of the cylindrical portion 11. However, it is not always necessary to do so, and the third seal portion 31b and the tapered surface 16 are in contact with the first and second seal portions 29a and 29b by the contact portion 14a and the annular flat surface 15 of the cylindrical portion 11. Then, the cylindrical portion 11 may be brought into contact when it reaches a position that is a predetermined distance from the connection position. Further, the contact portion of the third seal portion 31 b with the tapered surface 16 is located at an intermediate portion of the tapered portion 31 a in the axial direction of the slide cylinder 26. That is, it is located in front of the base end portion of the tapered portion 31a.

  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 is inserted into the main body portion 21 to a predetermined position, the contact portion 14a, the annular flat surface 15 and the tapered surface 16 of the cylindrical portion 11 abut against the first, second and third seal portions 29a, 29b and 31b, respectively. . Therefore, when the cylindrical portion 11 is further inserted, the slide cylinder 26 is moved to the rear end side against the urging force of the coil spring 27. When the cylindrical portion 11 is inserted to the connection position, the guide member 28 moves rearward from the through hole 21b, and the engagement groove 13 of the plug 10 faces the through hole 21b. As a result, the sphere 22 is moved inward by the tapered surface 24 c of the operation cylinder 24 and the coil spring 25, and the inner end of the sphere 22 enters the engagement groove 13. As a result, the plug 10 is connected to the socket 20 so that it cannot escape. At this time, the operation cylinder 24 is moved to the engagement position by the coil spring 25. Therefore, the sphere 22 does not escape from the engagement groove 13.

  In the connected state in which the plug 10 is connected to the socket 20, the inside of the plug 10 and the inside of the main body 21 communicate with each other via the slide cylinder 26. In addition, the tip portion of the plug 10 (cylindrical portion 11) and the tip portion of the slide cylinder 26 have a contact portion 14 a, an annular flat surface 15, and a tapered surface 16 that are first, second, and third due to the urging force of the coil spring 27. The seal portions 29a, 29b and 31b are hermetically sealed by being brought into press contact with each other. That is, the distal end portion of the cylindrical portion 11 and the distal end portion of the slide cylinder 26 are sealed at three concentric locations. Therefore, gas can be reliably prevented from leaking between the cylindrical portion 11 and the slide cylinder 26.

  Further, although the number of sealing portions is increased by the amount of sealing by the tapered surface 16 and the third seal portion 31b as compared with the conventional sealing structure shown in FIG. 7, the urging force of the coil spring 27 is increased so much. There is no need. That is, assuming that a portion other than the first and second seal portions 29a and 29b of the seal member 29 is pressed and brought into contact with the distal end portion of the cylindrical portion 11, the contact portion with respect to the cylindrical portion 11 of the seal member 29 is equivalent to the contact portion. If the biasing force of the coil spring 27 is made constant, the contact surface pressure between the first and second seal portions 29a, 29b, the contact portion 14a and the annular flat surface 15 is reduced. . Therefore, it is necessary to increase the urging force of the coil spring 27.

  However, in the above-described sealing structure according to the present invention, the third seal portion 31b is formed on the outer peripheral surface of the tapered portion 31a which is a free end portion. In addition, the contact portion of the third seal portion 31b with respect to the tapered surface 16 is located at an intermediate portion in the direction of the axis of the slide cylinder 26 (= the axis of the main body portion 21). Therefore, in a state where the plug 10 and the socket 20 are connected, the gas pressure acts to expand the taper portion 31a, and the third seal portion 31b is pressed against the taper surface 16 by the gas pressure. Thus, since the pressure of gas can be utilized as a force for pressing and contacting the third seal portion 31b to the tapered surface 16, the urging force of the coil spring 27 can be reduced accordingly. Therefore, when inserting the cylindrical part 11 into the main body part 21, a large force is not required. Therefore, operability is improved. In addition, since it is not necessary to increase the biasing force acting on the seal member 29 and the inner peripheral side seal member 31, early deterioration of the seal member 29 and the inner peripheral side seal member 31 can be prevented.

  When the plug 10 is pulled out from the socket 20, the operation tube 24 is moved from the engagement position to the release position. Then, the large diameter hole 24b of the operation cylinder 24 faces the through hole 21b. As a result, the sphere 22 can move outward, and the inner end of the sphere 22 escapes from the engagement groove 13. Therefore, the plug 10 can be extracted from the socket 20. When the plug 10 is extracted from the socket 20, the slide cylinder 26 is moved from the connection position to the standby position by the coil spring 27. Further, when the inner peripheral surface of the tapered hole portion 24c abuts on the outer end portion of the spherical body 22, the operation cylinder 24 is positioned at the release position.

  Next, a second embodiment of the present invention shown in FIGS. 4 to 6 will be described. In the second embodiment, only the configuration different from that of the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

  In the second 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 smaller 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 32 made of an O-ring or the like is provided at the rear end portion of the outer peripheral surface of the slide cylinder 26. The seal member 32 is seated on the valve seat 21 f by a coil spring 27 and another coil spring 33. When the seal member 32 is seated on the valve seat 21f, a portion upstream of the valve seat 21f inside the main body 21 (portion on the joint 23 side) and a downstream portion 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 biasing force of the coil spring 27 and the coil spring 33 is sufficient as the biasing force for seating the seal member 32 on the valve seat 21f, only one of them may be used.

  Similar to the first embodiment, the slide cylinder 26 can move between the standby position and the connection position, and the position of the slide cylinder 26 when the seal member 32 is seated on the valve seat 21f is the standby position. It is. On the other hand, the position of the slide cylinder 26 when moved by the cylindrical portion 11 inserted to the connection position is the connection position.

  The slide cylinder 26 is formed with a plurality of passage holes 26c penetrating the peripheral wall portion. As shown in FIG. 5, when the plug 10 is connected to the socket 20, that is, when the slide cylinder 26 is located at the coupling position, at least a part of the passage hole 26c is formed in the valve seat 2f. It arrange | positions so that it may be located in the back end side (upstream side in the distribution direction of gas). 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. Then, it flows from the slide cylinder 26 into the gas passage 12 of the plug 10. When the slide cylinder 26 is located at the coupling position, the 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 34 that seals between the outer peripheral surface of the guide member 28 and the inner peripheral surface of the main body portion 21 is provided on the guide member 28 located on the downstream side of the valve seat 21f.

  A cylindrical intermediate member 35 is slidably provided at the tip of the slide cylinder 26. A guide member 28 is fixed to the outer periphery of the intermediate member 35. A seal member 29 is inserted and fixed in an annular space formed between the guide member 28 and the intermediate member 35. 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. Furthermore, in this embodiment, when the cylindrical portion 11 is further inserted into the main body portion 21 by a predetermined distance after the contact portion 14a and the annular flat surface 15 abut against the first and second seal portions 29a and 29b, the taper is tapered. The surface 16 abuts against the third seal portion 31b. Of course, you may make it contact | abut the contact part 14a, the annular plane 15, and the taper surface 16 simultaneously with the 1st-3rd seal | sticker part 29a, 29b, 31b.

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the above-described embodiment, the annular flat surface 15 is used as the contact portion in addition to the contact portion 14a. However, the annular flat surface 15 is not necessarily formed.

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 sectional drawing which shows 2nd 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 sectional drawing which shows the principal part of the prior art example of the sealing structure of a plug and a socket.

Explanation of symbols

10 Plug 11 Cylindrical part 14a Contact part 15 Annular plane (contact part)
16 Tapered surface 20 Socket 21 Main body 24 Operation cylinder 26 Slide cylinder 27 Coil spring (biasing means)
29 Seal member 31 Inner circumferential side seal member

Claims (3)

A plug having a cylindrical portion at the distal end and an annular contact portion formed at a position spaced from the inner peripheral edge of the distal end surface of the cylindrical portion to the outer peripheral side, and the cylindrical portion of the plug are removably inserted. A cylindrical main body, a slide cylinder provided on the inner periphery of the main body so as to be movable in the axial direction, an urging means for urging the slide cylinder toward the plug, and the slide cylinder When the cylindrical part is inserted into the main body part to a predetermined connection position in order to connect a socket having a sealing member made of an elastic material provided in an annular shape at the tip part located on the plug side, the sealing member In the sealing structure of the plug and the socket in which the contact portion is pressed and contacted by the urging force of the urging means, whereby the space between the cylindrical portion and the slide cylinder is sealed.
An elastic material is annularly formed at the tip of the slide cylinder located on the inner peripheral side of the seal member, and the outer peripheral surface is annularly formed by the urging means at the intersection between the tip surface of the cylindrical portion and the inner peripheral surface. An inner peripheral side sealing member is provided that is pressed against and thereby seals between the cylindrical portion and the slide cylinder,
The distal end portion of the inner circumferential side seal member is a free end portion that is not restrained by the slide cylinder so that the distal end portion located on the cylindrical portion side of the inner circumferential side seal member can elastically expand and contract, The sealing of the plug and socket is characterized in that the outer peripheral surface of the free end located on the front end side of the slide cylinder is pressed into contact with the intersection of the front end surface of the cylindrical portion and the inner peripheral surface. Stop structure. The plug and socket sealing structure according to claim 1, wherein the seal member and the inner peripheral side seal member are made of different materials and different from each other. The taper surface is formed in the intersection part of the front end surface of the said plug, and an internal peripheral surface, The outer peripheral surface of the said inner peripheral side sealing member is press-contacted to this taper surface, The Claim 2 characterized by the above-mentioned. Sealing structure of the described plug and socket.

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