JP2008275085A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a pair of joint members from separating with great force by pressure in a pipe during detachment, and to safely and easily detach. <P>SOLUTION: This pipe joint 1 comprises a nipple 10 and a socket 20. The nipple 10 is inserted in the socket 20 while engaging a fixed pin 25 and a movable pin 27 provided on an inner peripheral face 23a of a nipple insertion hole 23 of the socket 20 into pin engagement grooves 15 formed on an outer peripheral face of a large diameter cylinder part 11 of the nipple 10 and moving the nipple 10 along the inside of the socket 20. The movable pin 27 is fitted in a fitting recess part 16, and the nipple 10 and the socket 20 are attached. Upon detachment, each of the pins 25, 27 is hooked in a second bend part 15b in the middle of each pin engagement groove 15 to thereby prevent the nipple 10 and the socket 20 from being separated with great force and release the inner pressure of the piping. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe joint that is attached to the distal ends of a pair of connected pipe bodies and removably connects the pipe bodies.

  Wet cutting equipment that uses diamond blades to cut semiconductors and electronic parts, etc., while controlling heat generation at the processing points and supplying cutting water to the processing points to remove cutting waste generated when cutting semiconductors, etc. While being processed. The cutting water is used as waste water after the use is finished, and the waste water is collected and processed in a waste water treatment facility through a pipe. This wastewater treatment facility usually includes a pump that sucks wastewater and a filter that filters cutting waste and the like.

  Since the filter used in the wastewater treatment facility catches the above-mentioned cutting waste and the like, there is a risk that clogging will occur over time. When the filter is clogged, the treatment capacity of the wastewater treatment facility is reduced, so that the filter is replaced every time the filter is used for a certain period of time. At this time, the piping may be removed, and in order to remove the piping, there is a means in which a detachable pipe joint is provided in the middle of the pipe in advance and the pipe joint is removed.

  Various detachable pipe joints are provided, and the one-touch coupler of Patent Document 1 is an example of such a joint.

Japanese Utility Model Publication No. 02-017207

  As described in the above-mentioned patent document, a normal pipe joint is a type in which the other joint member is detachably attached to a member of one joint. In such a pipe joint, when the pressure is removed in the pipe, both the joint members are vigorously separated by the internal pressure. For this reason, there has been a problem that it is difficult to remove.

  Accordingly, an object of the present invention is to provide a pipe joint in which a pair of joint members can be effectively prevented from being vigorously separated due to pressure in the pipe when removed, and the removal work can be performed safely and easily. Yes.

  The present invention relates to a pipe joint in which a cylindrical nipple is detachably inserted into a nipple insertion hole of a socket having a cylindrical nipple insertion hole, and the inner peripheral surface of the socket nipple insertion hole has a radial direction. A fixed pin that protrudes inward and a movable pin that is movable forward and backward from the inner peripheral surface to the inner side in the radial direction and that is biased so as to advance from the inner peripheral surface by a biasing member are provided in the socket. There is provided unlocking means for retracting the movable pin from the inner peripheral surface of the nipple insertion hole. On the other hand, the outer peripheral surface of one end, which is the insertion side to the socket of the nipple, is open to the end surface on the insertion side and the other. Pin engagement grooves that extend toward the ends and engage with the fixed pins and the movable pins are formed, and in these pin engagement grooves, fitting recesses into which the movable pins are fitted are formed. ,this A pin locking portion for locking the fixed pin and the movable pin is provided between the joint recess and the opening, and the nipple is fitted on the inner peripheral surface of the socket and the tip or outer peripheral surface of the nipple. It is characterized in that a close contact portion that is liquid-tightly attached to each other in a state where the movable pin of the socket has reached the joint recess is provided.

  To put the pipe joint of the present invention into a mounted state, the following operation is performed. First, with the movable pin of the socket retracted from the inner peripheral surface of the nipple insertion hole by the unlocking means, the movable pin and the fixed pin are inserted into the pin engaging grooves from the openings and engaged. Then, the nipple is relatively inserted into the socket insertion hole of the socket while causing each pin to enter along each pin engaging groove. When the movable pin of the socket reaches the fitting recess of the nipple, the retracting of the movable pin by the unlocking means is finished, and the movable pin is fitted into the fitting recess. In this state, the close contact portions of the socket and the nipple are in close contact with each other in a liquid-tight manner, and the coupling of the pipe joint is completed. Conversely, when the nipple is removed from the socket, the movable pin is retracted from the fitting recess by the unlocking means, and the socket and the nipple are relatively separated from each other along each pin engaging groove. At this time, if pressure remains in the pipe, the close contact between the socket and the nipple is released, and at the same time, the pressure in the pipe is released to the outside of the pipe. The sockets try to be separated from each other. However, in the present invention, the fixed pin and the movable pin are respectively hooked on the pin locking portions provided in the pin engaging groove, and the nipple and the socket are not separated from each other. When the pressure in the piping is released, remove the state where each pin is locked to each locking part, and further move the nipple from the socket relatively along each pin engaging groove, When each pin exits from the opening of each engagement groove, the nipple is removed from the socket.

  According to the present invention, when an attempt is made to remove the nipple from the socket while pressure remains in the pipe, the fixed pin and the movable pin are once hooked on the pin locking portion. Are not separated from each other, and the pressure in the pipe is released during the primary operation, so that the normal pressure can be obtained. And in the secondary operation which pulls out the next actual nipple from a socket, it will carry out in the state of a normal pressure. As a result, the socket and nipple can be removed safely and easily.

  As the pin engagement groove of the pipe joint of the present invention, it extends substantially along one circumferential direction from the opening, and then meanders to the other circumferential side opposite to the one circumferential direction through a bent portion. And a form in which the bent portion is a pin locking portion. In this embodiment, when inserting the nipple into the socket, the socket and the nipple are relatively rotated so that the socket rotates in one circumferential direction until each pin reaches the pin locking portion from the opening. Rotate in the opposite direction after passing through each locking part. In this state, there is an advantage that the primary operation for releasing the internal pressure and the secondary operation for actually separating the nipple and the socket are convenient and easy to use.

  In the pipe joint of the present invention, the fixed pin and the movable pin are provided in the socket, and the pin engaging groove and the pin locking portion are provided in the nipple, so that the pressure remaining in the pipe when the nipple is removed from the socket is reduced. Even if the socket is released, the socket and the nipple can be prevented from being separated at once. Therefore, the socket and nipple can be removed safely and easily.

  FIG. 1 is a perspective view showing components and pipe bodies 2 and 3 constituting a pipe joint 1 according to an embodiment. The pipe joint 1 is composed of a cylindrical nipple 10 and a socket 20. In this pipe joint 1, a nipple 10 and a socket 20 are attached to the distal ends of the pipe bodies 2 and 3, and the pipe bodies 2 and 3 are detachably connected.

  Couplers 2a and 3a, which are integrally formed with nuts 2b and 3b, are attached to the ends of the pipe bodies 2 and 3, respectively. The nipple 10 includes a cylindrical large-diameter cylindrical portion 11 serving as a base, and a cylindrical screw portion 12 is coaxially formed at one axial end portion of the large-diameter cylindrical portion 11. The socket 20 has a cylindrical main body 21 as a base, and a cylindrical screw portion 22 (see FIG. 3) is coaxially formed at one axial end of the main body 21. The nipple 10 and the socket 20 are respectively attached to the distal ends of the tubular bodies 2 and 3 by screwing the nuts 2b and 3b of the couplers 2a and 3a into the threaded portions 12 and 22, respectively. In the present embodiment, the pipe body and the pipe joint (nipple 10 and socket 20) are fixed using a screw type, but the present invention is not limited to this as long as the mechanism can fix the pipe body and the pipe joint.

  As shown in FIG. 2, a cylindrical small-diameter cylindrical portion 13 having a diameter smaller than that of the large-diameter cylindrical portion 11 is provided at the end opposite to the threaded portion 12 side of the large-diameter cylindrical portion 11 of the nipple 10. 11 is formed coaxially. In the nipple 10, a pipe line 10 a that penetrates the large-diameter cylindrical portion 11, the screw portion 12, and the small-diameter cylindrical portion 13 is formed. An O-ring 14 formed of an elastic member such as rubber is mounted on the outer periphery of the small diameter cylindrical portion 13 so as to slightly protrude from the outer peripheral surface of the small diameter cylindrical portion 13. A pin engagement groove 15 that opens to the end surface on the small diameter cylindrical portion 13 side and extends to the screw portion 12 side is formed at the end on the small diameter cylindrical portion 13 side on the outer periphery of the large diameter cylindrical portion 11. The pin engaging groove 15 extends shortly in the axial direction from the opening, passes through a first bent portion 15a having a right angle, extends substantially along one circumferential direction, and further passes through the second bent portion 15b, and then enters one circumferential direction. It extends diagonally in the other circumferential direction on the opposite side. A fitting recess 16 deeper than the pin engaging groove 15 is formed at the end of the pin engaging groove 15 meandering in this way.

  As shown in FIG. 3, a pipe 20 a that penetrates the main body 21 and the screw portion 22 is formed in the socket 20. A nipple insertion hole 23 having a diameter slightly larger than that of the large-diameter cylindrical portion 11 of the nipple 10 is formed coaxially with the conduit 20a at the end portion on the main body 21 side of the conduit 20a. The nipple 10 is inserted into the nipple insertion hole 23. Further, an intermediate hole 24 having a diameter slightly larger than that of the small diameter cylindrical portion 13 of the nipple 10 is formed in the intermediate portion of the pipe line 20a. The diameter of the intermediate hole 24 is set so that the O-ring 14 is elastically adhered. When the nipple 10 is inserted into the nipple insertion hole 23, the O-ring 14 of the nipple 10 comes into close contact with the inner peripheral surface 24 a of the intermediate hole 24.

  On the inner peripheral surface 23 a of the nipple insertion hole 23, a fixing pin 25 that protrudes radially inward is provided. The fixing pin 25 engages with the pin engaging groove 15 of the nipple 10 and protrudes inward in the radial direction by the length of being caught by the bent portion 15a.

  A groove 21 a extending in the axial direction is formed on the outer peripheral surface of the main body 21. A lifter 26 is embedded in the groove 21a, and a movable pin 27 is provided at the tip of the lifter 26 on the nipple insertion hole 23 side. The movable pin 27 is inserted into a hole 21c penetrating the groove 21a and the nipple insertion hole 23 so as to be movable forward and backward with respect to the nipple insertion hole 23. The lifter 26 is swingably supported via a stopper 28 that penetrates a pair of stopper grooves 21b formed on the outer peripheral surface of the main body 21 in the groove 21a. A spring 29 is embedded between the operation side end 26a opposite to the movable pin 27 side of the lifter 26 and the bottom of the groove 21a. The operation side end portion 26a of the lifter 26 is urged radially outward by the spring 29 and presses the movable pin 27 on the opposite side radially inward with the stopper 28 as an axis. Thereby, the movable pin 27 always protrudes from the inner peripheral surface 23 a of the nipple insertion hole 23. The movable pin 27 is retracted radially outward from the inner peripheral surface 23a of the nipple insertion hole 23 by pushing the operation side end 26a of the lifter 26 radially inward against the force of the spring 29. At this time, the movable pin 27 is not completely retracted from the inner peripheral surface 23a, but is slightly protruded from the inner peripheral surface 23a.

  As shown in FIG. 3b, in this embodiment, one movable pin 27 and two fixed pins 25 are provided on the inner peripheral surface 23a of the nipple insertion hole 23 at equal intervals. When the nipple 10 is removed from the socket 20, any one of the fixed pin 25 and the movable pin 27 may be hooked on the bent portion 15a.

  Next, the effect | action of the pipe joint 1 of this embodiment is demonstrated. In order to connect the nipple 10 and the socket 20, first, the operation side end portion 26 a of the lifter 26 is pushed radially inward to retract the movable pin 27 from the inner peripheral surface 23 a of the nipple insertion hole 23. Next, the nipple 10 is inserted into the nipple insertion hole 23 of the socket 20 while the fixing pin 25 is advanced along the pin engagement groove 15 and the nipple 10 and the socket 20 are rotated in the direction along the pin engagement groove 15. insert. In this process, the force pushing the lifter 26 is released, and the movable pin 27 moves along the pin engaging groove 15. When the movable pin 27 of the socket 20 reaches the fitting recess 16 of the nipple 10, the movable pin 27 is fitted into the fitting recess 16. In this state, the O-ring 14 of the nipple 10 comes into close contact with the inner peripheral surface 24a of the intermediate hole 24 of the socket 20 in an elastic and liquid-tight manner, and the connection of the pipe joint 1 is completed.

  On the contrary, when the nipple 20 is removed from the socket 10, it is pushed again in the radial direction of the operation side end portion 26 a of the lifter 26 to retract the movable pin 27 from the fitting recess 16, and each pin 25, 27 is moved to each pin engagement groove 15. The socket 20 and the nipple 10 are relatively separated from each other while being rotated in a direction along the direction. At this time, if the pressure remains in the pipe, the contact state between the socket 10 and the nipple 20 is released, and at the same time, the pressure in the pipe is released to the outside of the pipe with a force corresponding to the pressure. The nipple 10 and the socket 20 try to be separated from each other. However, in the present invention, the fixed pin 25 and the movable pin 27 are respectively caught on the second bent portion 15b provided in the pin engaging groove 15, and the nipple 10 and the socket 20 are not separated. When the pressure in the pipe is released, the state where each pin is hooked on the second bent portion 15 b is removed, and the nipple 10 is relatively separated from the socket 20 while keeping each pin along each pin engaging groove 15. When the pins 25 and 27 come out of the openings of the engaging grooves 15, the nipple 10 is removed from the socket 20.

  According to the present invention, when the nipple 10 is to be removed from the socket 20 with pressure remaining in the pipe, the fixed pin 25 and the movable pin 27 are once hooked on the second bent portion 15b, so that momentum is generated at once. The socket 20 and the nipple 10 are not well separated from each other, and the pressure in the pipe is released during the primary operation, so that the normal pressure can be obtained. And in the secondary operation which pulls out the next actual nipple 10 from the socket 20, it will carry out in the state of a normal pressure. As a result, the removal work of the socket 20 and the nipple 10 can be performed safely and easily.

It is a perspective view of each component which comprises the pipe joint of one Embodiment. (A) The side view which showed the nipple of the pipe joint, (b) The front view of the nipple seen from the small diameter cylinder part side. (A) The front view of the socket seen from the nipple insertion hole side, (b) The side view which showed the socket of the pipe joint. It is the figure which showed operation | movement of the pin when removing a nipple from a socket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pipe joint 10 ... Nipple 14 ... O-ring (contact part)
15 ... Pin engaging groove 15b ... Second bent part (pin locking part)
16 ... Fitting recess 20 ... Socket 23 ... Nipple insertion hole 23a ... Inner peripheral surface of nipple insertion hole 24 ... Intermediate hole (adhesion part)
25 ... fixing pin 26 ... lifter (lock release means)
27 ... movable pin 29 ... spring (biasing member)

Claims (2)

A pipe joint in which a cylindrical nipple is detachably inserted into the nipple insertion hole of a socket having a cylindrical nipple insertion hole,
A fixed pin protruding radially inward on the inner peripheral surface of the nipple insertion hole of the socket, and advancing and retreating from the inner peripheral surface to the radially inner side, and is advanced from the inner peripheral surface by a biasing member The socket is provided with a movable pin that is biased, and the socket is provided with unlocking means for retracting the movable pin from the inner peripheral surface of the nipple insertion hole,
On the other hand, an outer peripheral surface of one end portion on the insertion side of the nipple into the socket opens to the end surface on the insertion side and extends toward the other end portion, and the fixed pin and the movable pin engage with each other. A pin engagement groove is formed,
The pin engagement grooves are formed with fitting recesses into which the movable pins are fitted, and the fixed pins and the movable pins are locked between the fitting recesses and the openings. Pin locking part is provided,
Further, the inner peripheral surface of the socket and the tip or outer peripheral surface of the nipple are provided with close contact portions that are in liquid-tight contact with each other when the movable pin of the socket reaches the fitting recess of the nipple. A pipe joint characterized by having   The pin engaging groove formed in the nipple extends substantially along one direction from the opening, and then meanders to the other circumferential side opposite to one circumferential side through a bent portion. The pipe joint according to claim 1, wherein the bent portion is the pin locking portion.

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