JP2013217499A - Pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe which can be used for a separation preventing pipe joint preventing separation of a socket and a spigot connected by insertion from separating in the direction of a pipe axis and with which workability is improved by facilitating temporal reservation of a spigot during connection.SOLUTION: A pipe 10 has a socket 1, whose inner periphery side can be mounted with a seal material 3, and the seal material 3 seals air tightly between the inner periphery of the socket 1 and the outer periphery of a spigot 2 inserted into the socket 1. The pipe 10 is further provided with: a separation prevention member 4, disposed between the seal member 3 and an end face 11a of an opening part 11, and engaging with the outer periphery face of the spigot 2 to prevent separation of the spigot 2 from the socket 1; and a flange part 16 protruding in the direction of a pipe axis from the end face 11a of the opening part 11 in a manner of extending the inner periphery face of the opening part 11 of the socket 1.

Description

  The present invention relates to a pipe that can be used as a disconnection prevention pipe joint that prevents a receiving port and an insertion port that is inserted and connected to the receiving port from separating in the tube axis direction.

  FIG. 7 is a cross-sectional view of a detachment prevention pipe joint described in Patent Document 1 below. A sealing material 83 is mounted inside the receiving port 81, and the sealing material 83 seals between the inner periphery of the receiving port 81 and the outer periphery of the insertion port 82 inserted therein. A protrusion 86 that engages with a lock ring 84 housed inside the receiving port 81 is provided on the outer periphery of the distal end of the insertion port 82, and is configured to prevent the insertion port 82 from being detached from the receiving port 81. Yes. The rubber ring 85 is attached to center the lock ring 84.

  In this type of pipe joint, since the inner diameter of the opening 87 of the receiving port 81 is formed large so that the projection 86 of the insertion port 82 can pass during connection, the inner peripheral surface of the opening 87 and the insertion port 82 A certain amount of gap is generated between the outer peripheral surface. This gap is useful for providing a bending function between the insertion openings, but when a deformed pipe such as a curved pipe is connected, the connection state becomes unstable due to the action of an unbalanced force. To do. Therefore, in the pipe joint of FIG. 7, a raised portion 88 that fills this gap is provided on the outer periphery of the insertion opening 82, thereby preventing bending between the reception opening. The liner 91 is mounted to prevent expansion / contraction between the receiving opening and is centered by a rubber ring 92.

  This pipe joint is a slip-on type pipe joint, and by inserting the insertion port 82 into the receiving port 81, the sealing material 83 is compressed, and the receiving port 81 and the insertion port 82 can be connected in a sealed state. it can. In general, the receiving port 81 and the insertion port 82 are connected by a connecting tool such as a lever block (registered trademark), and the insertion port 82 is moved close to the receiving port 81 via a jack provided in the connecting device. The insertion slot 82 is pulled in. A stopper 89 provided on the outer periphery of the insertion opening 82 is used for engagement with the connector.

By the way, as disclosed in Patent Documents 2 and 3 below, as a pipe joint, instead of the lock ring as described above, a separation preventing member is provided between the sealing material and the end face of the opening of the receiving port. There is something. In the pipe joint having such a structure, it is possible to prevent the insertion opening from being removed from the receiving opening by engaging the separation preventing member with the outer peripheral surface of the insertion opening. However, since the separation preventing member is provided near the opening of the receiving port, there are the following problems.
(I) Since the insertion of the insertion opening is difficult and unstable, the insertion opening drawn into the receiving opening at the time of connection tends to be inclined, and the insertion opening may press the seal material and damage it. The “temporary deposit of the insertion port” referred to here means that the tip of the insertion port is placed slightly on the opening of the receiving port and temporarily placed.
(Ii) The bend prevention bulge provided in the insertion opening is disposed at a position where it interferes with the separation preventing member, thereby inhibiting the separation preventing function of the separation preventing member.

JP 7-332555 A JP-A-61-88091 JP 2006-342594 A

  The object of the present invention can be used for a disconnection prevention pipe joint that prevents the receiving port and the insertion port inserted and connected thereto from being detached in the direction of the tube axis. An object of the present invention is to provide a tube that can improve the performance.

  As a detachment prevention pipe joint that can use the pipe of the present invention, a sealing material that seals between an inner periphery of a receiving port and an outer periphery of an insertion port that is inserted into the receiving port, and an opening portion of the sealing material and the receiving port A detachment preventing member disposed between the end surface of the insertion port and engaged with the outer peripheral surface of the insertion port to prevent the insertion port from being detached from the reception port; and provided on the outer periphery of the insertion port, A raised portion that fills a gap between the inner peripheral surface of the opening of the mouth and the outer peripheral surface of the insertion port; and a stopper that is provided on the outer periphery of the insertion port so as to protrude outward in the radial direction from the raised portion. The stopper extends from the opening of the receiving port in the tube axis direction, receives the stopper from the tube axis direction while allowing insertion of the protruding portion, and restricts the entry of the protruding portion so as not to interfere with the separation preventing member. A thing provided with a buttock is mentioned.

  This separation preventing pipe joint is provided with a flange extending in the tube axis direction from the opening of the receiving port, so that the tip of the insertion port can be stably placed on the flange when connecting. Since it can be deposited and the guide action by the buttocks can be achieved, it can be easily pulled in with an appropriate posture without making the insertion opening oblique. In addition, the outer periphery of the insertion opening is provided with a raised portion that fills the gap between the inner peripheral surface of the opening of the receiving opening and the outer peripheral surface of the insertion opening. Is granted. Nevertheless, the hook portion receives the stopper of the insertion opening and restricts the entry of the raised portion, thereby preventing the raised portion and the separation preventing member from interfering with each other, thereby ensuring the function of preventing the separation of the pipe joint.

  As a preferred embodiment of the present invention, a member in which the separation preventing member is accommodated in an accommodation groove having an opening of the receiving port as a side wall can be mentioned. In such a case, the area in which the insertion slot can be placed is reduced in the opening, and provisional storage of the insertion slot becomes very difficult.Therefore, the present invention can stably deposit the insertion slot using the collar. Especially useful.

  In the above-described pipe joint, when the flange portion receives the stopper, the inner peripheral surface of the receiving port and the outer periphery of the insertion port cover a range from the opening of the receiving port to the tip of the flange portion. It is preferable that the raised portion fills the gap between the surfaces. According to such a configuration, since the range in which the raised portion fills the gap can be widened, it is possible to satisfactorily ensure the function of preventing bending between the receiving opening.

  In this invention, it is preferable that the said collar part is formed in the strip | belt shape along the circumferential direction. Thereby, since it becomes easy to deposit an insertion opening temporarily, workability | operativity improves. In addition, foreign matter outside the tube is less likely to enter the separation preventing member, so that the dust prevention effect can be enhanced and the separation prevention function can be satisfactorily maintained.

  In the present invention, it is preferable that the flange gradually increases the inner diameter in a direction away from the separation preventing member. Thereby, it becomes easy to temporarily deposit the insertion opening, and the insertion opening can be easily pulled into the receiving opening, so that workability is improved.

  The pipe joint may be configured to prevent relative rotation between the receiving port and the insertion port by inserting the stopper into an insertion hole formed in the flange portion. According to such a configuration, the stopper and the collar can be locked in the circumferential direction to prevent relative rotation between the receiving opening, so that the connection state of the pipe joint can be satisfactorily stabilized.

  Further, the pipe according to the present invention is a pipe having a receiving port to which a sealing material can be attached on the inner peripheral side, and extends from the end surface of the opening so as to extend the inner peripheral surface of the opening of the receiving port. A collar portion extending in the axial direction is provided. This pipe can be used for the pipe joint as described above. As described above, the insertion port can be easily pulled into the receiving port in an appropriate posture, or the bending-preventing bulge and the separation preventing member provided in the insertion port. Can be prevented. If this tube is used, even if the insertion port inserted into the receiving port does not have a raised portion for preventing bending, there is an advantage that it is easy to temporarily deposit the insertion port at the time of connection. Can be improved.

The figure which shows one Embodiment of the separation prevention pipe joint in which the pipe | tube of this invention is used Front view of the socket Side view of the insertion AA arrow sectional view of FIG. Sectional drawing which shows the state which carried out temporary deposit of the mouth Side view showing a separation preventing pipe joint according to another embodiment Sectional drawing which shows the separation prevention pipe joint described in patent document 1

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing an embodiment of a detachment prevention pipe joint in which the pipe of the present invention is used, in which an upper half shows a sectional view and a lower half shows a side view. In the present embodiment, an example in which the pipe joint is applied to a connecting portion between the straight pipe 10 that extends linearly and the curved pipe 20 that is a deformed pipe is illustrated. The pipe joint shown in FIG. 1 has an insertion port 2 of a curved pipe 20 inserted and connected to a receiving port 1 of a straight pipe 10, and the straight pipe 10 and the curved pipe 20 are both ductile cast iron pipes that can be used as water pipes. is there.

  A fitting groove 12 is formed on the inner peripheral surface on the back side of the opening 11 of the receiving port 1, and an annular sealing material 3 is attached to the fitting groove 12. The sealing material 3 seals between the inner periphery of the receiving port 1 and the outer periphery of the insertion port 2, whereby the straight pipe 10 and the curved pipe 20 are connected in a watertight manner. Further, a separation preventing member 4 is disposed between the sealing material 3 and the end surface 11 a of the opening 11, and this engages with the outer peripheral surface of the insertion port 2, whereby the insertion port 2 is detached from the receiving port 1. It is comprised so that it can prevent. The separation preventing member 4 is accommodated in an accommodation groove 13 having the opening 11 as a side wall, and a claw portion 41 is formed on the inner peripheral surface thereof.

  A screw hole 14 penetrating the receiving hole 1 is formed in the opening 11, and the push-off bolt 5 screwed into the screw hole 14 is operated to press the separation preventing member 4 from the outside in the pipe radial direction. Thus, the claw portion 41 bites into the outer peripheral surface of the insertion slot 2, and the separation preventing member 4 can be firmly engaged with the insertion slot 2. In addition, the outer peripheral surface of the separation preventing member 4 is inclined so that the wedge effect is exerted when a force in the direction of pulling out the insertion slot 2 from the receptacle 1 is applied, and cooperation with the biting action of the claw portion 41 is achieved. Due to the action, the detachment of the pipe joint can be firmly prevented.

  FIG. 2 is a front view of the receiving port 1 as viewed from the opening 11 side (left side of FIG. 1). Although it is hidden and not visible in FIG. 2, the separation preventing member 4 is formed in an arc shape when viewed from the front and is disposed at a plurality of circumferential positions (six positions in the present embodiment). Bolts 5 are attached. At two locations in the circumferential direction of the receiving port 1, communication holes 15 for attaching a connecting tool to the receiving port 1 when connecting the receiving port 1 and the insertion port 2 are provided.

  The receiving port 1 is configured to be able to form a contact region of the claw portion 41 in the entire circumferential direction of the insertion port 2, and each of the outer periphery of the insertion port 2 is between the separation preventing members 4 adjacent to each other in the circumferential direction. One claw portion 41 and the other claw portion 41 are arranged so as to overlap each other in the tube axis direction while being engaged with the surface. A detachment preventing member having such a structure is detailed in Japanese Patent Application Laid-Open No. 2008-309186 by the present applicant. In this case, since the raised portion 22 of the insertion opening 2 can interfere with the separation preventing member 4 at any location in the circumferential direction, the present invention is extremely useful.

  As shown in FIG. 1, a protrusion 21 is provided on the outer periphery of the distal end of the insertion slot 2, and the protrusion 21 is disposed on the back side of the sealing material 3 in a state where the pipe joint is connected. When the projection 21 is connected to the receiving port 81 as shown in FIG. 7, it can engage with the lock ring and exert a separation preventing function, but this pipe joint does not function directly. You do n’t have to. In this pipe joint, since the sealing material 3 is disposed behind the separation preventing member 4, the occurrence of rust can be avoided without bringing the separation preventing member 4 into contact with water in the pipe.

  In a state in which the insertion port 2 is inserted into the receiving port 1 by an appropriate amount, the outer diameter of the insertion port 2 on the opening side of the receiving port 1 relative to the separation preventing member 4 is smaller than the inner diameter of the opening 11. Are provided, and these fill the gap between the inner peripheral surface of the opening 11 of the receiving port 1 and the outer peripheral surface of the insertion port 2 to prevent bending between the receiving port insertion ports. It is configured to be able to. As shown in FIGS. 3 and 4, the raised portions 22 are provided at a plurality of locations in the circumferential direction (eight locations in the present embodiment) and have a trapezoidal shape when viewed from the front, but the present invention is not limited thereto.

  Further, a stopper 23 is provided on the outer periphery of the insertion slot 2 at a position slightly spaced from the end surface 11a of the opening 11 and protrudes outwardly in the pipe diameter direction from the ridge 22 and the inner peripheral surface of the opening 11. It has been. As shown in FIGS. 3 and 4, the stoppers 23 are provided at a plurality of locations in the circumferential direction (four locations in the present embodiment), each of which is formed in a columnar shape. In this embodiment, the stopper 23 is provided at a position corresponding to every other raised portion 22, but the present invention is not limited to this. The raised portion 22 and the stopper 23 are integrally provided on the outer periphery of the insertion opening 2.

  As shown in FIG. 1, the receiving port 1 is provided with a flange portion 16 that extends from the inner peripheral portion of the end surface 11 a of the opening portion 11 along the tube axis direction. The flange portion 16 has an inner diameter larger than the outer diameter of the raised portion 22 and allows the raised portion 22 to be inserted when the insertion port 2 is drawn into the receiving port 1. Further, when an appropriate amount of the insertion port 2 is inserted into the receiving port 1, the stopper 23 is received from the tube axis direction and the entry of the raised portion 22 is restricted so as not to interfere with the separation preventing member 4. In this state, the raised portion 22 fills a gap between the inner peripheral surface of the receiving port 1 and the outer peripheral surface of the insertion port 2 over the range from the opening 11 of the receiving port 1 to the tip of the flange portion 16. Yes.

  Since this pipe joint is a slip-on type pipe joint, the seal member 3 can be compressed by inserting the insertion opening 2 into the reception opening 1 and the reception opening 1 and the insertion opening 2 can be connected in a watertight manner. Hereinafter, an example of the connection procedure of the pipe joint will be described.

  First, the sealing material 3 is mounted in the fitting groove 12 of the receiving port 1 and the push bolt 5 is operated to move the separation preventing member 4 outward in the pipe diameter direction. Next, after connecting the receiving port 1 and the insertion port 2 with a connecting tool (not shown) such as a lever block, the insertion port 2 is moved close to the receiving port 1 via a jack provided on the connecting device, and the receiving port Pull the insertion slot 2 into 1. The work using this connector is performed in a state where the receiving port 1 and the insertion port 2 are properly centered in consideration of workability and safety, and the insertion port 2 is temporarily deposited for this alignment. Is implemented.

  In this pipe joint, as shown in FIG. 5, since the tip of the insertion slot 2 can be placed on the flange portion 16, the insertion slot 2 can be temporarily deposited in a stable manner. From this temporary deposit state, the insertion port 2 is drawn into the reception port 1 by connecting a connector to the reception port 1 and the insertion port 2 and moving the insertion port 2 close to the reception port 1 via a jack. . At this time, centering is properly performed by stable temporary deposit and a guide action is provided by the flange portion 16, so that the insertion port 2 can be easily pulled in with an appropriate posture without being inclined. . Further, since the flange portion 16 has a belt-like shape along the circumferential direction, and the inner diameter is gradually increased toward the direction away from the separation preventing member 4, the temporary insertion of the insertion port 2 and the drawing into the receiving port 1 are performed. Is further simplified and the workability is improved.

  On the other hand, when the flange portion 16 is not provided in the receiving port 1, the separation preventing member 4 is accommodated in the accommodating groove 13 having the opening portion 11 as a side wall. The area that can be placed is small, and it is very difficult to temporarily deposit the insertion slot 2. Therefore, when the insertion opening 2 is pulled into the receiving opening 1, the insertion opening 2 tends to be eccentric and inclined, and the insertion opening 2 may press the seal material 3 and damage it.

  In this pipe joint, in the process of inserting the insertion port 2 into the receiving port 1, the tip of the insertion port 2 passes through the inner periphery of the separation preventing member 4 or the sealing material 3, and the raised portion 22 is formed in the flange 16 or the opening. It penetrates into the inner periphery of the part 11. When the appropriate amount is inserted, the flange 16 receives the stopper 23 from the tube axis direction as shown in FIG. 1, and the relative movement between the receiving port 1 and the inserting port 2 is restricted. Therefore, at the time of connection, it is only necessary to continue the insertion work until the flange portion 16 receives the stopper 23, and the work such as the dimension measurement is not necessary for the insertion of the insertion slot 2, so that the positioning in the tube axis direction becomes very simple.

  After completing the insertion of the insertion slot 2, the coupling tool is removed, and the push bolt 5 is operated to cause the claw portion 41 of the separation preventing member 4 to bite into the outer peripheral surface of the insertion slot 2. As described above, in the state of FIG. 1 in which the flange portion 16 receives the stopper 23, the further entry of the raised portion 22 is restricted, and the raised portion 22 and the separation preventing member 4 do not interfere with each other. Good separation prevention function is ensured. In addition, since the raised portion 22 fills the gap between the inner peripheral surface of the receiving port 1 and the outer peripheral surface of the insertion port 2 over the range from the opening 11 of the receiving port 1 to the tip of the flange portion 16, The anti-bending function between the receiving opening is ensured well.

  Further, in this pipe joint, in a state where the flange portion 16 receives the stopper 23, the detachment preventing member 4 is engaged with the insertion slot 2, whereby the relative movement between the receiving slot 1 and the insertion slot 2 in the pipe axis direction is achieved. And an expansion / contraction preventing function can be provided between the receiving opening. Therefore, in FIG. 1, although the front-end | tip of the insertion port 2 is approaching the back | inner side end surface 17 of the receiving port 1, this invention is not limited to this. In addition, in this pipe joint, since the flange portion 16 forms a belt shape along the circumferential direction, foreign matter outside the pipe is less likely to be mixed into the separation preventing member 4, so that the dust prevention effect is improved and the separation prevention function is improved. Can hold.

  In the present invention, in the range where the positional relationship between the respective parts is appropriately obtained, the end face of the collar portion 16 is taken into consideration in consideration of workability when temporarily depositing the insertion slot 2 and guide action when the insertion slot 2 is retracted. The extension length L from 11a can be set as appropriate. If it is a ductile cast iron pipe like this embodiment, 15-25 mm is illustrated as extension length L, and it is about 22 mm in nominal diameter (phi) 100. The thickness of the flange portion 16 is not particularly limited, but it is preferable that the outer peripheral surface of the flange portion 16 is aligned with the outer peripheral surface of the stopper 23 from the viewpoint of improving the appearance after connection.

  FIG. 6 is a side view showing a modification of the pipe joint described above. This pipe joint is provided with a band-shaped flange 18 having a longer extension than the flange 16 described above, and an insertion hole 19 for inserting a stopper 23 into the flange 18 is formed. At the time of connection, the flange portion 18 receives the stopper 23 from the tube axis direction through the insertion hole 19 and restricts further intrusion of the raised portion 22. Moreover, since the flange 18 and the stopper 23 are also locked in the circumferential direction, relative rotation between the receiving port 1 and the insertion port 2 can be prevented. Thereby, in the pipe joint to which the deformed pipe is connected, the bending, expansion and contraction and rotation between the receiving opening are restricted, and the connection state can be stabilized well.

  This pipe joint is particularly useful for connecting deformed pipes that are susceptible to non-average forces because it can provide a bend prevention function between the receiving openings. Such deformed pipes include not only the curved pipes as described above but also T-shaped pipes and cross pipes.

  The present invention is not limited to the embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention. The structure of the separation preventing member, the shape of the raised portion and the stopper, etc. It can be changed as appropriate.

  The pipe joint in which the pipe according to the present invention is used can be applied to a connection part of a water pipe, but is not limited to this, and is widely used for fluid pipes used for various liquids / gases other than water. Applicable.

DESCRIPTION OF SYMBOLS 1 Receptacle 2 Insertion 3 Sealing material 4 Detachment prevention member 11 Opening part 11a End surface 13 Housing groove 16 Gutter part 19 Insertion hole 22 Raised part 23 Stopper

Claims (6)

In a tube having a receiving port capable of mounting the sealing material on the inner peripheral side, and the sealing material seals between the inner periphery of the receiving port and the outer periphery of the insertion port inserted into the receiving port,
A separation preventing member that is disposed between the sealing material and an end surface of the opening of the receiving port, and engages with an outer peripheral surface of the insertion port to prevent the insertion port from being detached from the receiving port,
A tube comprising: a flange extending in an axial direction from an end surface of the opening so as to extend an inner peripheral surface of the opening of the receiving port.   The pipe according to claim 1, wherein the separation preventing member is accommodated in an accommodation groove having an opening of the receiving port as a side wall.   The pipe according to claim 1 or 2, wherein the flange is formed in a belt shape along the circumferential direction.   The pipe according to any one of claims 1 to 3, wherein the flange gradually increases an inner diameter in a direction away from the separation preventing member.   The tube according to any one of claims 1 to 4, wherein an extension length of the flange portion from an end face of the opening portion of the receiving port is 25 mm or less.   The pipe according to any one of claims 1 to 5, wherein the flange portion has insertion holes extending in a tube axis direction from a distal end of the flange portion at a plurality of locations in a circumferential direction.