JP2007298106A - Pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe fitting capable of securely connecting a plug with a male screw part formed at its tip end at once and capable of miniaturizing. <P>SOLUTION: A cylinder collar 11 energized by a resilient force of a first resilient means 10, an annular slider 13 for restricting sliding quantity of the cylinder collar 11 and a second resilient means 20 for contacting with the annular slider 13 are stored in a pipe fitting main body 2. The resilient force of the second resilient means 20 is set as stronger than that of the first resilient means 10 and, when the plug 50 is inserted while resisting the resilient force of the first resilient means, the cylinder collar 11, the annular slider 13 and the second resilient means 20 are integrally slid. When the annular slider 13 contacts with an inner wall part 2a of a pipe fitting main body 1, in the case that an upper side engaging claw 16 and a lower side engaging claw 17 where a female screw part is formed do not engage with the male screw part 52, the insert quantity is increased by deforming the second resilient means 20 with pressing pressure force exceeding the resilient force of the second resilient means 20 and the plug 50 is securely connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint, and more particularly, to a pipe joint that can be reliably connected with a single touch of a plug having a male threaded portion at the tip, and that can be downsized.

  2. Description of the Related Art Conventionally, there is known a configuration of a pipe joint that can be connected / released with a single touch with a plug that is disposed in a fluid pipe line and has a male threaded portion formed at the tip.

  Patent document 1 by the present applicant discloses a pipe joint having a tilting chuck in which a female thread portion that engages with a male thread portion of a plug is formed. FIG. 9 shows a partial cross-sectional side view of this pipe joint. A pipe connecting portion 61 a is formed on one end side of the main cylinder 61 of the pipe joint 60, and an inner cylinder 64 in which an engagement hole for the locking ball 65 is formed is joined to the other end side. In the inner periphery of the inner cylinder 64, a locking ring 71 and a front sliding cylinder 66 and a rear sliding cylinder 69 which are integrally engaged are slidably accommodated. In addition, a movable sleeve 62 is slidably attached to the outer peripheral portion of the inner cylinder 64, and a tilting chuck 70 in which a female screw portion 70 b is formed between the movable sleeve 62 and the inner cylinder 64. It is arranged.

When the plug 80 having the male thread portion 82 is inserted into the pipe joint 60, first, the inclined portion 83 formed at the tip comes into contact with the seal ring 67 attached to the front sliding cylinder 66. Note that the engaging cylinder 68 disposed in the center of the pipe line is for connecting the pipe line by pressing a poppet valve or the like biased by a spring inside the plug 80. is there. When the plug 80 is further pushed against the urging force of the spring 72, the locking ring 71, the front sliding cylinder 66 and the rear sliding cylinder 69 are slid to the left in the figure, and the locking ball 65 Is engaged with the holding groove 73, and the movable sleeve 62, which is no longer locked by the locking ball 65, slides to the right in the figure. Along with this, the tilting chuck 70 tilts radially inward with the support portion 70a as an axis, and engages with the male thread portion 82 of the plug 80, whereby the plug 80 is supported by the pipe joint 60. .
Japanese Utility Model Publication 2-39111

  However, in the technique of Patent Document 1, since a tilting chuck that tilts radially outward with the support portion as an axis is used, it is easy to increase the size of the pipe joint in the radial direction. In addition, increasing the circumferential dimension of the tilting chuck or increasing the number of threads of the female thread to increase the connection strength tends to increase the size of the pipe joint in the direction of the flow path. There was a problem that usability decreased.

  Further, the position of the thread of the male thread portion of the plug varies depending on the rotational direction at the time of insertion with respect to the female thread portion formed in the tilting chuck. Therefore, even if the insertion depth of the plug is the same, the tilting chuck may be difficult to close because the male screw portion and the female screw portion do not just mesh with each other. Such a phenomenon not only makes the operator bothersome, but if the tilting chuck closes when the plug is pulled back slightly from the state described above, the pressing force on the seal member that seals the pipe is insufficient. It is also conceivable that both are connected in a state. In order to avoid the above situation and to securely connect the plug with one touch, the insertion depth at the time of connection is always within a predetermined range regardless of the rotation direction of the plug. It is preferable that

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of the prior art, and to provide a pipe joint that can be reliably connected with a single touch of a plug having a male threaded portion formed at the tip and that can be downsized.

  In order to achieve the above-described object, the present invention provides a joint body having a holding cylinder into which a plug having a male thread portion formed at the tip is inserted, and a lock loosely fitted in a key hole provided in the holding cylinder. A tube configured to have a female screw portion that engages with the male screw portion, and is configured to hold the plug by moving the locking claw radially inward. In the joint, inside the joint body, a collar member that is urged toward the flow path by the resilient force of the first resilient means with respect to the joint body, and slides on the inner periphery of the holding cylinder A slider member that is held so as to be engaged and that regulates the sliding amount of the collar member and a second resilient means that abuts against the slider member are housed. The resilience of the means is set stronger than the resilience of the first impact means. When the plug is inserted into the holding cylinder against the resilient force of the first resilient means, the collar member, the slider member, and the second resilient means slide together. In addition, when the plug is inserted into the holding cylinder by a predetermined insertion amount determined based on the sliding amount regulated by the slider member, the second bullet is inserted when the plug is inserted beyond the predetermined insertion amount. The first configuration is such that the plug can be further inserted by an amount corresponding to the amount of deformation by elastically deforming the second projecting means by pushing in with a pressing force larger than the urging force of the ejecting means. There are features.

  A second feature is that the amount of insertion that can be inserted beyond the predetermined amount of insertion is set to be equal to or substantially equivalent to one pitch of the thread of the male screw portion.

  Further, the flow path communicated by the plug and the joint body is arranged on the other side of the slider member in the flow path direction with the first seal means disposed on one side of the slider member in the flow path direction. There is a third feature in that the second sealing means is sealed between the slider member and the second sealing means, and the second resilient means is disposed between the slider member and the second sealing means.

  Further, the first sealing means is provided with a bellows-like expansion / contraction portion that comes into contact with the radially inner wall surface of the joint body and is folded as the plug is inserted, and the second sealing means has a diameter A fourth point is that a plurality of hook-shaped portions that are formed in an annular shape extending inward in the direction, are in contact with the inclined surface formed at the tip of the plug, and are deformed along with the insertion of the plug are provided. There are features.

  The first resilient means is configured to generate a resilient force in the flow path direction by a coil spring, and the second resilient means is configured to generate a resilient force in the flow path direction by a leaf spring. There is a fifth feature.

  The leaf spring is a plurality of arm portions formed on one end side of a cylindrical member loosely fitted on the outer peripheral portion of the collar member, and the second seal is provided on the other end side of the cylindrical member. A sixth feature is that an annular locking portion that contacts the means is formed.

  Further, a ring member that is slidably held on the outer peripheral portion of the holding cylinder and is provided with a biasing force in a sliding direction by a spring member, and is disposed on a radially outer side of the ring member, and the insertion of the plug A sleeve member that slides to a predetermined position in accordance with the operation, and the sliding movement of the ring member in the direction biased by the spring member is permitted as the sleeve member slides. According to a seventh feature of the present invention, the locking claw is configured to be pressed radially inward by being pressed by the ring member permitted to slide.

  According to the first invention, in the joint body, the collar member urged toward the flow path by the resilient force of the first resilient means with respect to the joint body, and the inner peripheral portion of the holding cylinder A slider member that is slidably held and engages with the collar member to regulate the sliding amount of the collar member, and a second resilient means that contacts the slider member are housed. The elastic force is set to be stronger than the elastic force of the first elastic means, and when the plug is inserted into the holding cylinder against the elastic force of the first elastic means, the collar member, the slider member, The second projecting means is integrally slid and inserted into the holding cylinder by a predetermined insertion amount determined based on the sliding amount regulated by the slider member, and the plug is inserted beyond the predetermined insertion amount. The second projecting means is pushed in with a pressing force larger than the urging force of the second projecting means. Since the plug can be inserted further by the amount of deformation by elastic deformation, the locking claw does not engage the male screw part well when the plug is inserted by a predetermined amount. Even in this case, a pipe joint in which the locking claw and the male thread portion are reliably engaged can be obtained by applying a larger pressing force. In addition, since the radial dimension of the pipe joint is greatly reduced by using a locking claw movable in the radial direction, it is possible to obtain a small and reliable pipe joint.

  According to the second invention, the insertion amount that can be inserted beyond the predetermined insertion amount is set to be equal to or substantially equal to one pitch of the thread of the male screw portion. It is possible to stably connect the plug by controlling the amount of insertion within a predetermined range and always keeping the pressing force applied to the sealing means within the predetermined range.

  According to the third aspect of the present invention, the flow path communicated by the plug and the joint body includes the first sealing means disposed on one side of the slider member in the flow path direction and the other side of the slider member in the flow path direction. The second resilient means is disposed between the slider member and the second sealing means, so that the function of sealing the flow path is provided on both sides of the slider member. As a result, the burden on the deformation of each sealing means can be reduced as compared with the case where an integral large-sized seal is used. Further, by adjusting the dimension of the second sealing means in the flow path direction, it is possible to arbitrarily set the degree to which the pressing force for inserting the plug is transmitted to the second elastic means.

  According to the fourth invention, the first sealing means is provided with a bellows-like expansion / contraction portion that comes into contact with the radially inner wall surface of the joint body and is folded as the plug is inserted. The first seal is provided with a plurality of hook-shaped portions that are formed in an annular shape that extends radially inward, abuts against the inclined surface formed at the tip of the plug, and is deformed along with the insertion of the plug. In the means, the same expansion and contraction operation is always repeated, so that the burden is small, and it is possible to improve the durability and reduce the size. Further, in the second sealing means, it is easy to set a large amount of deformation in the bowl-shaped portion, so that it is possible to widen the range of the pressing force that can maintain sufficient sealing performance.

  According to the fifth invention, the first resilient means generates a resilient force in the flow path direction by the coil spring, and the second resilient means generates a resilient force in the flow path direction by the leaf spring. Thus, the second projecting means that generates a high resilience with a short stroke is obtained, and it is easy to make a difference from the resilience of the first projecting means.

  According to the sixth invention, the leaf spring is a plurality of arm portions formed on one end side of the cylindrical member loosely fitted on the outer peripheral portion of the collar member, and on the other end side of the cylindrical member, 2 Since an annular locking portion that contacts the sealing means is formed, it is easy to obtain a high elasticity with a short stroke, and the elasticity can be adjusted by changing the shape of the arm. It can be done arbitrarily. Further, by providing the annular locking portion, it is possible to reliably transmit the pressing force from the second sealing means to the arm portion.

  According to the seventh invention, the ring member that is slidably held on the outer peripheral portion of the holding cylinder and is provided with a biasing force in the sliding direction by the spring member, and disposed on the radially outer side of the ring member, A sleeve member that slides to a predetermined position as the plug is inserted, and the sliding movement of the ring member in the direction biased by the spring member is permitted as the sleeve member slides. Since the locking claw is configured to be pressed radially inward by being pressed by the ring member that is permitted to slide, the ring member is independent of the sleeve member. And can slide. In a pipe joint in which a sleeve member and a ring member are integrated, when an attempt is made to insert a plug with the sleeve member held, the locking claw is pressed radially inward by the pushing force. There is a risk that the plug will be in a connected state before the amount of insertion that allows the sealing means to seal the path to function sufficiently is reached. On the other hand, since the ring member that presses the locking claw can be slid independently with respect to the sleeve member, a sufficient pressing force is applied to the sealing means even when the plug is inserted with the sleeve member held. It is possible to connect the plug by inserting it up to a predetermined position.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a pipe joint 1 according to an embodiment of the present invention. The pipe joint 1 is paired with the plug 50 in which the male thread portion 52 according to a predetermined standard is formed, and the pipe connected to the pipe joint 1 and the pipe connected to the plug 50 are connected / released with one touch. Is for. A pipe connecting portion 3 is formed on one end side of the joint body 2 of the pipe joint 1, and a plug holding cylinder 4 into which a male screw portion 52 is inserted is formed on the other end side. On the outer peripheral side of the joint body 2, there are disposed a movable sleeve 6 as a sleeve member in which a groove 6 a for preventing slip is formed, and a locking operation sleeve 7 having a larger diameter than the movable sleeve 6. When the plug 50 is pushed into the pipe joint 1, the movable sleeve 6 slides to the right in the drawing to the position where it is locked by the locking ring 5, and at the same time, the plug 50 is stably held by the pipe joint 1. It is configured as follows. On the other hand, the plug 50 can be easily separated by sliding the movable sleeve 6 leftward to the original position.

  A locking ball 8 is embedded in the outer peripheral surface of the joint body 2, and a guide groove 7 a for the locking ball 8 is formed in the locking operation sleeve 7. This is used when prohibiting the disconnecting operation of the plug 50. When the locking operation sleeve 7 is rotated along the guide groove 7a when the plug 50 is connected, the movable sleeve 6 is moved to the left. The sliding operation is prohibited.

  2 is a cross-sectional view taken along line AA in FIG. The same reference numerals as those described above denote the same or equivalent parts. The plug holding cylinder 4 formed integrally with the joint body 2 is formed with a through hole 4a in which a locking ball 9 made of a steel ball is loosely fitted so as to be movable in the radial direction. The plug holding cylinder 4 is formed with an arcuate upper hole 4b and a lower hole 4c along the circumferential direction, and an upper locking claw 16 and a lower locking claw 17 have a diameter inside each. It is loosely fitted so as to be movable in the direction. On the radially inner side of the upper locking claw 16 and the lower locking claw 17, a female screw portion for engaging with the male screw portion 52 and holding the plug 50 is formed. Since this female thread portion is configured such that a continuous thread is formed by the upper latching claw 16 and the lower latching claw 17, this sectional view shows a state in which the thread is shifted by exactly half a pitch. It is shown.

  An annular slider 13 as a slider member formed of metal or the like and provided with a locking ball holding groove 35 is slidably held on the inner peripheral portion of the plug holding cylinder 4. A cylindrical collar 11 as a collar member that becomes a flow path when the plug 50 is connected is engaged with the portion. The cylindrical collar 11 formed of metal or the like is composed of a large-diameter portion 11a and a small-diameter portion 11b with a stepped portion 11c interposed therebetween, and a first spring by a coil spring is provided on the inner peripheral side of the large-diameter portion 11a. Means 10 are provided. Further, the cylindrical collar 11 is always pressed rightward in the figure by the urging force of the first projecting means 10, and in this state, the annular slider 13 that engages with the cylindrical collar 11 contacts the locking ball 9. It is held at the touching position. An inclined surface 53 is formed at the distal end portion of the plug 50 on the radially outer side of the flow path 54. Further, when the pipe joint 1 and the plug 50 are connected, the flow path 54 of the plug 50 is engaged with the small diameter portion 11 b of the cylindrical collar 11.

  At both ends of the annular slider 13, a first seal engagement portion 13a and a second seal engagement portion 13b having a radially outwardly extending portion are formed. And the 1st seal | sticker 12 as a 1st seal | sticker means which has the bellows-like expansion-contraction part 12a is engaged between the internal peripheral surface of the 1st seal | sticker engagement part 13a, and the outer peripheral surface of the said large diameter part 11a. ing. On the other hand, between the inner peripheral surface of the second seal engaging portion 13b and the outer peripheral surface of the small-diameter portion 11b, a second seal 14 as a second sealing means in which a plurality of hook-shaped portions 14a are formed is engaged. Has been. The first seal 12 and the second seal 14 both formed of rubber, resin or the like have a function of sealing the flow path 3a of the pipe joint 1 and the flow path 54 of the plug 50 when the plug 50 is connected. . A second elastic means 20 having a leaf spring is disposed between the second seal 14 and one end face of the annular slider 13. The second projecting means 20 is not deformed in the state shown in the figure, and is only lightly held between the annular slider 13 and the second seal 14.

  The movable sleeve 6 disposed on the outer peripheral side of the plug holding cylinder 4 performs a sliding operation because the locking ball 9 is engaged with the engagement groove 6c when the plug 50 is not inserted. I can't. In addition, a coil spring 30 is provided between the movable sleeve 6 and the locking operation sleeve 7 to apply an urging force for separating them from each other. The locking operation sleeve 7 is disposed at the right end in the drawing. At the left end of the figure and the outer peripheral stepped portion of the joint main body 2, so that the sliding operation is also impossible.

  Between the plug holding cylinder 4 and the movable sleeve 6, a locking claw pressing ring 15 as a ring member urged rightward in the drawing by a coil spring 31 is disposed. The locking claw pressing ring 15 is slidable with respect to the plug holding cylinder 4 and the movable sleeve 6, but in the state shown in the figure, it is formed on the inner peripheral side of the movable sleeve 6 by the biasing force of the coil spring 31. It is held at a position in contact with the engaging step 6d. A sloped locking portion 6 b that contacts the locking ring 5 is formed at the right end of the movable sleeve 6.

  3 is a cross-sectional view taken along line BB in FIG. The same reference numerals as those described above denote the same or equivalent parts. The upper locking claw 16 and the lower locking claw 17 loosely fitted in the upper hole 4b and the lower hole 4c are indicated by broken lines in the gap formed between the plug holding cylinder 4 and the movable sleeve 6. You can move to a position. And when it moves to a radial inside, only the internal thread part protrudes from the inner peripheral surface of the plug holding cylinder 4. Note that the upper locking claw 16 and the lower locking claw 17 may be provided with an engagement protrusion or the like for preventing the plug holding cylinder 4 from dropping out or reducing unnecessary play. According to the upper locking claw 16 and the lower locking claw 17 as described above, a pipe joint that enables connection of a plug having a male screw portion at the tip can be obtained with a small number of parts and a simple configuration. . Moreover, in this embodiment, since the upper side latching claw 16 and the lower side latching claw 17 differ only in the shape of the internal thread part, each can also be assembled | attached reversely.

  FIG. 4 is a front view (a) and a side view (b) of the second projecting means 20 according to an embodiment of the present invention. The second resilient means 20 has a plurality of arm portions 23 formed on one end side of a hub portion 21 as a cylindrical member forming the shaft hole 25 and an annular locking portion 22 formed on the other end side. It is set as the structure. The shaft hole 25 is engaged with the small diameter portion 11b (see FIG. 2) of the cylindrical collar 11. The second elastic means 20 is made of a thin steel plate or the like, and can be manufactured by, for example, pressing a flat plate in which the trough portion 24 is punched and the arm portion 23 is formed. The second elastic means 20 can generate an elastic force between the arm part 23 and the locking part 22 by the arm part 23 extending radially outward functioning as a leaf spring. is there. According to such a configuration of the second bullet means 20, it is possible to easily obtain a bullet means that generates a small amount of stroke and a strong elasticity. In addition, it is easy to adjust the resilience by changing the shape and number of arms.

  Returning to FIG. 2, the operation when the plug 50 is inserted will be described. When the plug 50 is inserted into the plug holding cylinder 4, the inclined surface 53 at the tip first comes into contact with the second seal 14, and the inclined surface 53 and the small-diameter portion 11 b of the cylindrical collar 11 increase as the pressing force increases. The sealing function is demonstrated. Since the plurality of flanges 14a formed on the second seal 14 are formed in an annular shape extending radially inward, the deformation amount after the inclined surface 53 abuts is large, and a stepped step portion Compared with the system provided with the above, it is possible to expand the range of the pressing force capable of maintaining a sufficient hermeticity. And when a negative pressure is applied to the pipe line, the hook-shaped portion 14a can be deformed so as to be drawn inward in the radial direction along the inclined surface 53, so that the pressure applied to the connected pipe line is a positive pressure. The same sealing function can be obtained in both cases.

  Next, when the hook-shaped portion 14a is further deformed against the urging force of the first projecting means 10 from the deformed state, the expansion / contraction portion 12a of the first seal 12 is deformed and the second seal 14, the second projecting means 20, and the cylindrical collar 11 start to slide integrally to the left in the figure. The elastic force (or spring constant) of the second elastic means 20 is set to be larger than the elastic force of the first elastic means 10, so that only the pressing force required for this sliding operation is The second projecting means 20 is not deformed. During this sliding operation, the upper locking claw 16 and the lower locking claw 17 are in a state of moving radially outward. FIG. 5 shows a state in which the plug 50 is further pushed in and is stably connected to the pipe joint 1.

  FIG. 5 is a cross-sectional view showing a state in which the plug 50 is connected to the pipe joint 1. The same reference numerals as those described above denote the same or equivalent parts. When the annular slider 13 is slid to a position where the left end portion of the first seal engaging portion 13 a contacts the inner wall portion 2 a of the joint body 2 by the pushing operation of the plug 50, the locking ball 9 is moved to the locking ball of the annular slider 13. Engages with the holding groove 35. Then, at the same time as the locking ball 9 moves downward in the drawing, the movable sleeve 6 released from the locked state slides to the right in the drawing by the biasing force of the coil spring 31 biasing the latching claw pressing ring 15. Is done. At this time, the upper locking claw 16 and the lower locking claw 17 that have moved outward in the radial direction are configured to be forcibly pressed radially inward by the locking claw pressing ring 15.

  A slope part 16 a and a slope part 17 a are formed at the radially outer ends of the upper latching claw 16 and the lower latching claw 17. On the other hand, the engaging claw pressing ring 15 is formed with a pressing inclined surface 15a that comes into contact with the inclined surface portion 16a and the inclined surface portion 17a, and the upper engaging claw 16 and the lower engaging claw 17 are connected to the engaging claw pressing ring. In accordance with the sliding movement 15, it is moved radially inward so as to be lifted up by the pressing slope 15 a. When the upper locking claw 16 and the lower locking claw 17 are engaged with the male screw portion 52 of the plug 50, the plug 50 is held by the pipe joint 1.

  In the pipe joint 1 according to the present embodiment, since the entire outer periphery of the male screw part 52 is held by the entire inner peripheral part of the plug holding cylinder 4, compared to the conventional method using a tilt chuck, The dimension in the radial direction can be greatly reduced and the stability at the time of connection can be increased.

In the state of FIG. 5, the first seal 12 has a contracted portion 12 a folded into a predetermined shape, thereby increasing the pressing force on the radially inner wall surface 2 b in contact with the periphery and the flow path and the joint body 2. It is comprised so that the function to seal between the inner peripheral parts of this may improve. Since the first seal 12 only expands and contracts as the annular slider 13 slides, the first seal 12 is less likely to be worn or deformed, and can always exhibit a predetermined sealing performance. Further, the right end side of the first seal 12 exhibits a sealing function between its outer peripheral surface and the inner peripheral surface of the first seal engaging portion 13a when a positive pressure is applied to the pipe line, When negative pressure is applied to the road, the inner peripheral surface of the right end of the first seal 12 is drawn into the large-diameter portion 11a side of the cylindrical collar 11, contacts the large-diameter portion 11a, and the telescopic portion 12a is cylindrical. The collar 11 is drawn into the large diameter portion 11a side and abuts on the large diameter portion 11a, and exhibits a sealing function on the inner peripheral surface thereof. It is configured to exhibit a sealing function.
In the state of FIG. 5, the second seal 14 is deformed in the umbrella-shaped portion where the hook-shaped portion 14 a is formed, and the gap 36 between the second seal engaging portion 13 b of the annular slider 13 is slightly narrowed. The gap 37 formed by the rim-shaped protrusion 14b is not changed. Further, the second projecting means 20 remains in its original shape, and a push-in allowance 38 is set between the plug holding cylinder 4 and the plug 50.

  In FIG. 5, the annular slider 13 is pushed in until it abuts against the inner peripheral portion of the joint body 2 against the urging force of the first resilient means 10, that is, when the plug 50 is pushed by a predetermined amount, The nail | claw 16 and the lower side latching claw 17 have shown the state which just engages with the external thread part 52 of the plug 50. FIG. However, when the position of the plug 50 in the rotational direction is shifted by 180 °, for example, it is conceivable that the female screw portion and the male screw portion do not engage well. The engagement relationship will be described with reference to FIG.

  FIG. 6 is an operation explanatory view of the upper locking claw 16 when the plug 50 is connected. FIG. 5 shows a state in which the upper locking claw 16 and the male screw portion 52 are just engaged when the plug 50 is pushed by a predetermined amount, as shown in FIG. However, even when the plug 50 is pushed by the same predetermined amount, the vicinity of the apex of the thread 16b of the female screw part and the vicinity of the apex of the thread 52a of the male screw part 52 are in contact with each other as shown in FIG. It may not be possible to match This also occurs at the same time between the lower locking claw 17 and the male screw portion 52. In this disengaged state, if the plug 50 is slid in the pulling direction, the plug 50 may be held in a state where the pressing force applied to the first seal 12 and the second seal 14 is slightly reduced. There is. In the pipe joint 1 according to this embodiment, the plug 50 is always in a state in which a pressing force within a predetermined range is applied to the first seal 12 and the second seal 14 regardless of the position of the plug 50 in the rotational direction. 50 is configured to be able to hold 50.

  FIG. 7 is a cross-sectional view showing a state in which the plug 50 is further pushed in from the state of FIG. The plug 50 can be further pushed in from the position shown in FIG. 5 by the pushing allowance 38 formed between the plug holding cylinder 4 and the plug 50. First, the plug 50 can be pushed in slightly against the elastic force of the second seal 14 while compressing the gap 36 shown in FIG. Then, when the plug 50 is further pushed in after the gap 36 is crushed, the elastic deformation of the second resilient means 20 is started, and the plug 50 is slid to the left in the drawing according to the amount of deformation. At this time, when the male screw part and the female screw part are slid to a position where the male screw part and the female screw part are engaged with each other, the upper locking claw 16 and the lower locking claw 17 that have been pressed radially inward by the locking claw pressing ring 15 have a diameter. The plug 50 and the pipe joint 1 are connected by moving inward in the direction.

  Since the push allowance 38 is set to about one pitch of the thread of the male screw portion 52 (or the female screw portion), the male screw portion and the female screw portion are always engaged before the push allowance 38 is fully pushed. There will be a position to do. Therefore, the amount of insertion of the plug 50 when stably connected to the pipe joint 1 is the predetermined amount of insertion when the annular slider 13 is slid to the left end (see FIG. 5), and the pushing amount from that state. The amount of insertion is surely kept within the amount of insertion (see FIG. 7) when pushed further to the left by 38. Since the pressing force applied to the first seal 12 and the second seal 14 is determined by the insertion amount of the plug 50, the pressing force applied to the first seal 12 and the second seal 14 can be surely kept within a predetermined range. Become.

  On the other hand, in the present embodiment, the hook-shaped portion 14a of the second seal 14 is formed so that its deformation amount is large, so that the plug 50 is pulled out by a half pitch from the predetermined insertion amount. Even when connected, a sufficient sealing function can be obtained.

  FIG. 8 is a side view showing a state in which the pipe joint 1 and the plug 50 are connected. As described above, when the plug 50 is connected, the locking sleeve 7 can be slid. When the plug 50 is rotated along the guide groove 7a, the movable sleeve 6 for separating the plug 50 is moved to the left in the drawing. The sliding operation is prohibited. Although the movable sleeve 6 and the locking claw pressing ring 15 can be formed as an integral part, in this embodiment, the movable sleeve 6 and the locking claw pressing ring 15 (see FIG. 7) are separate parts. Therefore, it is possible to connect the plug 50 with the movable sleeve 6 and it is easy to use.

  The shapes and materials of the first and second seals, the first and second resilient means, the annular slider, and the cylindrical collar are not limited to the above-described embodiments, and various modifications are possible. . For example, the number and shape of the arm portions of the second projecting means can be arbitrarily changed according to the desired resilience. Also, the shape and number of the locking claw that engages with the male thread portion of the plug and the hole in which the locking claw is loosely fitted can be variously changed. For example, the locking claw divided into four in the circumferential direction, etc. Can also be applied.

It is a side view of the pipe joint concerning one embodiment of the present invention. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 2. It is the front view (a) and side view (b) of the 2nd bulleting means which concern on one Embodiment of this invention. It is sectional drawing of the pipe joint which concerns on one Embodiment of this invention. It is action | operation explanatory drawing of the upper side latching claw at the time of connection of a plug. It is sectional drawing of the pipe joint which concerns on one Embodiment of this invention. It is a side view of the pipe joint concerning one embodiment of the present invention. It is a partial cross section side view of the conventional type pipe joint.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pipe joint, 2 ... Joint main body, 3 ... Pipe connection part, 4 ... Plug holding cylinder, 4b ... Upper hole, 4c ... Lower hole, 6 ... Movable sleeve, 9 ... Locking ball, 10 ... First elastic means 11 ... Cylinder collar (collar member), 12 ... first seal, 12a ... expandable part, 13 ... annular slider (slider member), 14 ... second seal, 14a ... saddle-like part, 15 ... locking claw pressing ring, 16 ... Upper locking claw, 17 ... Lower locking claw, 20 ... Second elastic means, 50 ... Plug, 52 ... Male screw part, 53 ... Inclined surface

Claims (7)

A joint body having a holding cylinder into which a plug having a male screw portion formed at the tip is inserted, and a locking claw loosely fitted in a hole provided in the holding cylinder,
The locking claw is formed with a female screw portion that engages with the male screw portion,
In the pipe joint configured to hold the plug by moving the locking claw radially inward,
Inside the joint body, a collar member urged in the direction of the flow path by the resilient force of the first resilient means with respect to the joint body and slidably held on the inner periphery of the holding cylinder And a slider member that is engaged with the collar member and regulates a sliding amount of the collar member, and a second resilient means that comes into contact with the slider member.
The resilience of the second projecting means is set stronger than the resilience of the first projecting means,
When the plug is inserted into the holding cylinder against the elastic force of the first elastic means, the collar member, the slider member, and the second elastic means are slid integrally. And a predetermined insertion amount determined based on the sliding amount regulated by the slider member is inserted into the holding cylinder,
When the plug is inserted beyond the predetermined insertion amount, the plug is pushed with a pressing force larger than the urging force of the second projecting means, and the second projecting means is elastically deformed. The pipe joint is configured so that only the plug can be further inserted.   2. The tube according to claim 1, wherein an insertion amount that can be inserted beyond the predetermined insertion amount is set to be equal to or substantially equivalent to one pitch of a screw thread of the male screw portion. Fittings. The flow path communicated by the plug and the joint body is disposed on the other side of the slider member in the flow direction and the first seal means disposed on the one side in the flow path direction of the slider member. And second sealing means.
The pipe joint according to claim 1 or 2, wherein the second elastic means is disposed between the slider member and the second seal means. The first seal means is provided with an accordion-like expansion and contraction portion that comes into contact with the radially inner wall surface of the joint body and is folded as the plug is inserted,
The second seal means has a plurality of hook-shaped portions that are formed in an annular shape extending radially inward, abut against an inclined surface formed at the tip of the plug, and are deformed along with insertion of the plug. The pipe joint according to claim 3, wherein the pipe joint is provided. The first elastic means generates an elastic force in a flow path direction by a coil spring,
The pipe joint according to any one of claims 1 to 4, wherein the second elastic means is configured to generate an elastic force in a flow path direction by a leaf spring. The leaf spring is a plurality of arm portions formed on one end side of a cylindrical member loosely fitted on the outer peripheral portion of the collar member,
The pipe joint according to claim 5, wherein an annular locking portion that comes into contact with the second sealing means is formed on the other end side of the cylindrical member. A ring member that is slidably held on the outer peripheral portion of the holding cylinder and is given a biasing force in a sliding direction by a spring member;
A sleeve member that is disposed on the radially outer side of the ring member and slides to a predetermined position in accordance with the insertion operation of the plug;
The sliding movement of the ring member in the direction biased by the spring member is configured to be permitted with the sliding of the sleeve member,
The said latching claw is comprised so that it may be pressed to radial inside by being pressed by the ring member in which the said sliding operation was permitted. Pipe fittings.

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