JP5019963B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint for connecting one fluid pipe and the other fluid pipe in a watertight state in fluid pipes such as sewers and waterworks, for example, and in particular for preventing corrosion of the pipe end face of the fluid pipe. The present invention relates to a pipe joint provided with an anticorrosion member.

  Conventionally, when an insertion portion of one fluid pipe is inserted into a receiving portion of the other fluid pipe and, for example, metal fluid pipes are connected to each other, a pipe having an insertion portion according to the situation at the installation site, etc. The length may be adjusted by cutting the body. Generally, the surface of such a metal tube body is coated with an anticorrosive paint or the like, but when cut as described above, the metal substrate is exposed on the tube end face of the insertion portion. For this reason, if installed as it is, there is a problem that the pipe end surface of the insertion port is corroded by the fluid.

  Therefore, it is conceivable to coat the pipe end face with anticorrosion paint after cutting, but since the work load at the site increases, such as an elastic material having a plurality of annular fins on the outer peripheral surface, etc. The insertion tube into which the cylindrical anticorrosion member and the metal cylinder that presses the anticorrosion member are inserted is inserted into the receiving pipe together with the anticorrosion member and the metal cylinder, and the pressure acting in the radial direction of the metal cylinder The annular fin formed on the outer peripheral surface of the anticorrosion member is pressed and brought into intimate contact with the inner peripheral surface of the insertion tube and the receiving tube, and the tube end surface of the insertion tube is attached to the side surface of the central annular fin among the annular fins. There is one that prevents corrosion of the tube end surface of the insertion tube (see, for example, Patent Document 1).

Utility Model Registration No. 2572578 (2nd page, Fig. 1)

  However, in the pipe joint described in Patent Document 1, when an unexpected external force such as an earthquake occurs, both pipes move relative to each other in the removal direction, so that the pipe end surface of the insertion pipe is in the center. There is a risk that the pipe end face will not be protected from corrosion because it is separated from the side face of the annular fin and the sealing performance between the pipe end face and the side face of the central annular fin is not maintained.

  The present invention has been made paying attention to such problems, and even when an unexpected external force or the like occurs, the tube end surface is always maintained by maintaining the sealing performance between the tube end surface of the insertion tube and the anticorrosion member. An object of the present invention is to provide a pipe joint capable of reliably preventing corrosion.

In order to solve the above problem, a pipe joint according to claim 1 of the present invention is
An insertion portion having a pipe end surface constituting one fluid pipe;
The insertion port portion is inserted, and a receiving port portion that constitutes the other fluid pipe having an accommodation surface that is substantially parallel to the tube axis on the inner peripheral surface and an annular back end surface;
Withdrawal restricting means for restricting removal of the insertion portion inserted into the receiving portion from the receiving portion;
An anti-corrosion member comprising an elastic material formed in an annular shape, disposed between the tube end surface of the insertion portion, the receiving surface of the receiving portion and the back end surface, and elastically deformed by being pressed ;
With
A pipe joint for connecting the one fluid pipe and the other fluid pipe in a watertight state,
In the anticorrosion member, a guide surface extending toward the insertion port side continuously from the outer peripheral side end portion in the contact surface with the tube end surface of the insertion port portion is formed along the circumferential direction. The guide surface is formed in a tapered surface shape that gradually decreases in diameter toward the contact surface,
The corrosion member, in a state in which pull-out is restricted in the insertion opening portion from the socket part by the pull-out regulating means, nearly the entire area of the tube end surface of the spigot portion which is inserted into the socket part It arrange | positions so that it may oppose the said contact surface, and it covers between the said tube end surface by pressing between the said tube end surface , the said receiving surface of the said receiving part, and the said back end surface, and elastically deforms, and the said anticorrosion member the inner peripheral surface of the is characterized that you contact the inner peripheral surface of the inserted pipe by extrusion deformed toward the tube axis.
According to this feature, when the insertion portion is inserted into the receiving portion , even if the insertion portion may be displaced from the axial center, the outer peripheral surface of the insertion portion is in sliding contact with the guide surface toward the axial center. It is guided, and the tube end surface can be reliably brought into contact with the contact surface to be covered. And, in the state where the removal of the insertion portion from the receiving portion is restricted by the removal restriction means, and the removal of the insertion portion from the receiving portion is restricted, the anticorrosion member is connected to the tube end surface of the insertion portion. It is arranged between the receiving surface of the receiving part and the back end surface, and covers the tube end surface in a state of being elastically deformed by being pressed, and the inner peripheral surface side of the anticorrosion member is pushed and deformed toward the tube axis. and abut against the inner peripheral surface of the mouth tube, for pressing the pipe end face by its elastic restoring force, you can always maintain a seal of the pipe end face by corrosion member. In addition, when an unexpected external force is generated, the tube end surface is elastically restored even if the insertion portion moves slightly with respect to the reception portion in a state where the removal of the insertion portion from the reception portion is restricted. It is always sealed by the anticorrosion member that closely follows the tube end surface by force.

The pipe joint according to claim 2 of the present invention is the pipe joint according to claim 1,
A contact surface of the anticorrosion member with the tube end surface of the insertion portion bulges toward the insertion portion side.
According to this feature, the anticorrosion member is easily crushed by the tube end surface, so that the insertion of the insertion portion into the receiving portion is facilitated, and when the tube end surface presses against the contact surface, the tube end surface contacts the tube end surface. Since the air between the contact surfaces is pushed out, a decrease in the adhesion between the tube end surface and the contact surface is prevented.

The pipe joint according to claim 3 of the present invention is the pipe joint according to claim 1 or 2,
A gap is formed in the vicinity of the contact surface of the anticorrosion member with the tube end surface of the insertion portion.
According to this feature, the anticorrosion member is easily crushed by the pipe end surface, so that the insertion portion can be easily inserted.

A pipe joint according to claim 4 of the present invention is the pipe joint according to any one of claims 1 to 3 ,
The anticorrosion member is formed with an inner peripheral contact surface extending in the circumferential direction continuously from the inner peripheral side end portion of the contact surface with the tube end surface of the insertion port portion toward the insertion port side. And
The inner peripheral abutting surface is characterized in that it is in close contact with the inner peripheral surface of the insertion portion in a state where at least the anticorrosion member covers the pipe end surface.
According to this feature, not only the tube end surface is covered, but also the inner peripheral surface of the insertion portion is covered, so that it is possible to more reliably prevent fluid from entering between the tube end surface and the contact surface.

The pipe joint according to claim 5 of the present invention is the pipe joint according to claim 4 ,
The inner circumferential abutment surface is formed in a tapered surface shape that gradually separates from the inner circumferential surface of the insertion portion toward the tip of the inner circumferential abutment surface,
The anticorrosion member is pressed between the tube end surface of the insertion portion inserted into the receiving portion and the inner end surface of the receiving portion to be elastically deformed, thereby contacting the inner peripheral surface of the insertion portion. It is characterized by being configured to touch.
According to this feature, the inner peripheral contact surface is gradually separated from the inner peripheral surface of the insertion portion toward the tip of the inner peripheral contact surface, so that the insertion portion is inserted into the receiving portion. It becomes easier, and since it is brought into contact with the inner peripheral surface of the insertion portion by elastic deformation due to the pressure on the tube end surface, a member for pressing the inner peripheral contact surface against the inner peripheral surface of the insertion portion is separately provided. Without providing, the inner peripheral surface of the insertion portion can be reliably covered with the inner peripheral contact surface only by utilizing elastic deformation.

  Examples of the present invention will be described below.

  Embodiment 1 of the present invention will be described with reference to the drawings. First, FIG. 1 is a schematic view showing an arrangement state of pipe joints in Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing the receiving portion and the insertion portion. 3 (a) is a front view showing the anticorrosion member, (b) is a right side view showing the anticorrosion member, (c) is a left side view showing the anticorrosion member, and (d) is It is AA sectional drawing of FIG.3 (c). FIG. 4A is a cross-sectional view showing a state in which the tube end surface of the insertion portion is not yet covered with the anticorrosion member, and FIG. 4B shows the insertion portion from the state of FIG. It is sectional drawing which shows the state inserted. FIG. 5A is a cross-sectional view showing a state in which the insertion port is restricted from being removed after the insertion port is further inserted in the insertion direction from the state of FIG. 4B, and FIG. It is sectional drawing which shows the state which the part moved to the removal direction from the state of Fig.5 (a).

  First, as shown in FIG. 1 of the present embodiment, the pipe line 4 of the present invention is, for example, a straight pipe 11 disposed in the ground, or a curved portion partially along a T-shaped pipe or a pipe axis. The elbow pipe 2 having a curved portion or a metal fluid pipe such as a bend pipe 13 having a relatively short length, and a path formed inside the pipe, for example, water and sewage or gas A fluid flows down or an electric wire or the like is wired.

  In particular, existing buried objects 3 such as existing pipes or existing cables are often buried in the ground, and it is inevitable to arrange the piping 4 while avoiding the buried objects 3. 2, a straight pipe 11 and a bend pipe 13 are appropriately combined, and the pipes can be connected to each other via the pipe joints 1 and 100 to form a desired pipe path. As described above, the types of members constituting the pipe line 4 are various, and the pipe joints connecting the respective members are required to be sealed without leaking the fluid flowing down inside the pipe.

  Further, at both ends of the elbow pipe 2, the straight pipe 11 and the bend pipe 13, a receiving portion 5 having a large diameter formed at one end in order to insert and connect one pipe body to the other pipe body. And the insertion portion 12 formed at the other end, and the insertion portion 12 and the receiving portion 5 constitute a part of the pipe joints 1 and 100. Moreover, anticorrosion paint etc. are apply | coated to the surface (an inner peripheral surface, an outer peripheral surface, a pipe end surface) of these each fluid pipe | tube, and the coating layer for anticorrosion is formed.

  In addition, since the pipe joint 1 and each pipe joint 100 are comprised in substantially the same way, below, the pipe joint 1 which consists of the receiving part 5 of the elbow pipe 2 and the insertion part 12 of the straight pipe 11 is used as a pipe joint. It will be described as an example, and description regarding the other pipe joint 100 will be omitted.

  As shown in FIG. 2, the pipe joint 1 in this embodiment includes an elbow pipe 2 having a receiving portion 5 and a straight pipe having an insertion portion 12 inserted into the inner peripheral surface of the receiving portion 5. 11, a sealing member 8 that has elasticity and prevents leakage of fluid from between the inner peripheral surface of the receiving port 5 and the outer peripheral surface 12a of the insertion port 12 inserted into the receiving port 5. The anti-corrosion member 14 for preventing the corrosion of the pipe end surface 12c of the mouth portion 12 and the removal restriction means 15 for restricting the removal of the insertion portion 12 from the receiving portion 5 are configured.

  Although the connection of the pipe joint 1 will be described later, the insertion portion 12 is inserted into the receiving portion 5 in the insertion direction toward the right side in FIG. 2, and the removal restricting means 15 connects the receiving portion 5 to the insertion portion 12. Regulate withdrawal. Hereinafter, the direction from the left side to the right side of FIG. 2 will be described as the insertion direction. In FIG. 5B, which will be described later, it is shown that the insertion portion 12 is moved away from the receiving portion 5, but the direction from the right side to the left side in FIG. 5B. Is described as the removal direction.

  As shown in FIG. 2, the inner diameter of the insertion portion 12 (the inner diameter of the coating layer 12d) is substantially the same as the inner diameter of the tube portion 6 of the elbow pipe 2, and the outer diameter of the insertion portion 12 is the receiving port. The diameter is slightly smaller than the inner diameter of the portion 5, and chamfering is performed near the tip of the outer peripheral surface 12 a of the straight pipe 11. Further, at the distal end of the insertion portion 12, there is a tube end surface 12 c formed along the circumferential direction continuous to the outer peripheral surface 12 a of the insertion portion 12 and the inner peripheral surface 12 b of the insertion portion 12. . In addition, this pipe end surface 12c is a surface where the metal substrate is exposed by cutting at a site to be described later.

  Inside the receiving part 5 of the elbow pipe 2 to which the seal member 8 and the anticorrosion member 14 are attached, there are a recess 5a provided along the circumferential direction on the opening end side of the elbow pipe 2, and a pipe depth deeper than the recess 5a. An accommodation groove 5e formed in the circumferential direction on the inner peripheral surface on the side, and an accommodation groove 5f formed in the circumferential direction on the inner peripheral surface on the back side of the tube from the accommodation groove 5e are formed. . Although not shown in particular, the coating layer is provided in a thin layer on the inner peripheral surface of the receiving portion 5 similarly to the insertion portion 12.

  The housing groove 5f is connected to the housing surface 5c substantially parallel to the tube axis C and the diameter of the housing surface 5c toward the tube axis C from the end of the tube at the back of the tube. And a rear end face 5d facing the pipe end face 12c.

  The seal member 8 is disposed in the fitting groove 8 a that fits in the concave portion 5 a formed along the circumferential direction on the inner peripheral surface of the receiving portion 5, and the inner peripheral surface of the receiving portion 5. And a valve portion 8c for watertightly sealing a gap between the insertion portion 12 and the outer peripheral surface 12a of the insertion portion 12, and the outer diameter is substantially the same as the inner diameter of the reception portion 5. And a rubber body having elasticity.

  The seal member 8 has a fitting portion 8a fitted in a circumferential direction in a concave portion 5a formed on the inner peripheral surface of the receiving portion 5. Further, in the fitted state, the valve portion 8c is located in the housing groove 5e toward the tube axis C direction of the elbow tube 2, and as shown in FIG. In a state where the portion 12 is not yet inserted and the valve portion 8c is not compressed, the cross-sectional shape is formed in a substantially circular shape, and the inner peripheral surface faces the tube axis C as compared with the fitting portion 8a. Bulges.

  The extraction restriction means 15 includes a plurality of bolt holes 5b formed at predetermined intervals in the circumferential direction on the outer peripheral surface in the vicinity of the outer end of the receiving portion 5, and a direction orthogonal to the tube axis C from the outside of the elbow pipe 2. And a plurality of push bolts 9 screwed into the bolt holes 5b, and a plurality of the bolts at predetermined intervals in the circumferential direction on the inner peripheral surface in the vicinity of the outer end of the receiving portion 5 (the present embodiment). 6 at intervals of 60 degrees), and a plurality of fixed claws 10 disposed in the arc groove 7 and having a sharp edge 10a at the tip. The outlet portion 5 and the insertion portion 12 are connected to each other by the removal restriction means 15 so that the removal of the insertion portion 12 from the reception portion 5 can be restricted.

  In addition, as shown in FIG. 2, in a state where the insertion portion 12 is not inserted, the sharp blade 10 a of the fixed claw 10 is attached to the receiving portion 5 so as not to interfere with the insertion of the insertion portion 12 described later. Retreats outward from the inner peripheral surface. The push-in bolt 9 is not necessarily screwed in a direction orthogonal to the tube axis, and may be screwed in a direction parallel or oblique to the tube axis.

  As shown in FIG. 2 and FIGS. 3A to 3C, the anticorrosion member 14 is made of a rubber body having elasticity formed in an annular shape, and as shown in FIG. It is formed in a U shape.

  As shown in FIGS. 2 and 3 (a) to 3 (d), the contact portion of the anticorrosion member 14 with which the tube end surface 12 c of the insertion portion 12 abuts is connected to a tube end surface 12 c of the insertion portion 12 described later. A bulging portion 17 to be pressed is formed. The bulging portion 17 is formed such that the central portion in the circumferential direction bulges toward the insertion portion 12 side (the left side of the drawing in FIG. 3D) from the outer peripheral side and the inner peripheral side. The surface of the bulging portion 17 is a curved contact surface 17a that contacts the tube end surface 12c of the insertion portion 12 in a state in which the insertion portion 12 described later is inserted (see FIG. 4A). .

  Further, on the outer peripheral side of the bulging portion 17 of the anticorrosion member 14, as shown in FIGS. 2 and 3 (a) to (d), from the outer peripheral side end portion of the contact surface 17a to the insertion portion 12 side. A guide portion 16 projecting toward the center is formed along the circumferential direction. Further, the peripheral surface of the guide portion 16 on the bulging portion 17 side, that is, the inner peripheral surface of the guide portion 16 is provided continuously from the outer peripheral edge of the contact surface 17a and extends toward the insertion portion 12 side. The guide surface 16a is formed from the tip to guide the outer peripheral surface 12a of the insertion portion 12 toward the axis when the insertion portion 12 is inserted into the receiving portion 5. It is formed in a tapered surface shape that gradually decreases in diameter toward the contact surface 17a.

  On the inner peripheral side of the anticorrosion member 14, an inner peripheral abutting portion 18 that protrudes from the inner peripheral end of the abutting surface 17a toward the insertion portion 12 is formed along the circumferential direction. Further, the peripheral surface of the inner peripheral contact portion 18 on the bulging portion 17 side, that is, the outer peripheral surface of the inner peripheral contact portion 18 is continuously provided from the outer peripheral edge of the contact surface 17a. It is set as the inner peripheral contact surface 18a extending toward the surface.

  As will be described later, the inner peripheral abutment surface 18a is configured such that when the insertion opening 12 is inserted into the receiving opening 5, the insertion opening 12 is easily inserted into the receiving opening 5 by widening the receiving opening. In the state in which the anticorrosion member 14 covers the pipe end surface 12c, the taper surface is formed so as to be gradually separated from the inner peripheral surface 12b of the insertion portion 12 (see FIG. 4A). It is comprised so that it may closely_contact | adhere to the internal peripheral surface 12b of the part 12. FIG.

  Further, the back surface 19 of the anticorrosion member 14 is formed substantially in parallel with the back end surface 5d, and can be in close contact with the back end surface 5d in a state in which the insertion portion 12 is inserted, as will be described later, to prevent fluid leakage. It has become.

  The outer diameter of the anticorrosion member 14 is formed to be slightly larger than the inner diameter of the receiving surface 5c of the receiving portion 5, and is mounted in the receiving groove 5f of the receiving portion 5 as shown in FIG. In this state, the outer peripheral surface 20 of the anticorrosion member 14 is in close contact with the receiving surface 5 c of the receiving portion 5.

  Next, the connection of the pipe joint 1 of the present invention will be described.

  As shown in FIG. 2, first, the anticorrosion member 14 is inserted into the receiving portion 5 from the tube end opening of the elbow tube 2, and is pushed into the receiving groove 5f by being pushed in until the back surface 19 comes into contact with the back end surface 5d. Thereafter, the seal member 8 is inserted into the receiving port portion 5 from the tube end opening of the elbow tube 2, and the fitting portion 8 a is fitted into the recess portion 5 a of the receiving port portion 5. In addition, the mounting operation of the anticorrosion member 14 or the mounting operation of the seal member 8 in the receiving portion 5 may be completed in advance at the shipping stage of the elbow pipe 2 or may be performed at the connection site of the pipe joint 1. is there.

  Next, when the insertion portion 12 of the straight tube 11 is inserted into the tube end opening of the elbow tube 2, the sealing member 8 in which the outer peripheral surface 12 a of the insertion portion 12 is fitted to the inner peripheral surface of the receiving portion 5. Is inserted into the receiving portion 5 while being in sliding contact with the fitting portion 8a, and the valve portion 8c is formed along the circumferential direction by the outer peripheral surface 12a of the insertion portion 12 and the inner peripheral surface of the receiving portion 5. The groove 5e is compressed. Thereby, the gap between the inner peripheral surface of the receiving portion 5 and the outer peripheral surface 12a of the insertion portion 12 is sealed, and the fluid from between the inner peripheral surface of the receiving portion 5 and the outer peripheral surface 12a of the insertion portion 12 is sealed. Leakage is prevented.

  Further, when the insertion portion 12 is inserted and the distal end of the insertion portion 12 reaches the distal end of the guide portion 16, the outer peripheral surface 12a at the opening end portion of the insertion portion 12 contacts the guide surface 16a, and then the guide It is inserted toward the inner side of the tube while being guided by sliding contact with the surface 16a. And this guide surface 16a is formed in the taper surface shape gradually diameter-reduced toward the contact surface 17a from the front-end | tip, and the axial center of the insertion part 12 shift | deviates with respect to the axial center of the receiving part 5. Even if it is inserted in this state, the outer peripheral surface 12a of the insertion portion 12 is slidably guided toward the axis by the guide surface 16a. As a result, as shown in FIG. 4A, in the contact position a where the tube end surface 12c contacts the top of the contact surface 17a of the bulging portion 17, substantially the entire area of the tube end surface 12c is aligned with the guide surface 16a. Since it arrange | positions so that the contact surface 17a between inner peripheral contact surfaces 18a may be opposed, the pipe end surface 12c contact | abuts reliably with the contact surface 17a over the circumferential direction. In addition, the guide surface of a guide part should just be formed along the circumferential direction of an anticorrosion member, and the guide surface 16a may be formed over the perimeter of the anticorrosion member 14 like a present Example. Alternatively, the guide surface may be formed on a part of the anticorrosion member in the circumferential direction or at a predetermined interval in the circumferential direction.

  Further, as described above, the inner peripheral contact surface 18a of the inner peripheral contact portion 18 is formed in a tapered surface shape that gradually increases in diameter from the contact surface 17a side toward the tip of the inner peripheral contact surface 18a. Since the receiving port of the circumferential contact portion 18 is widened, the insertion port portion 12 is inserted without the tube end surface 12c contacting the tip of the inner circumferential contact portion 18, and the inner circumferential contact portion is inserted by the tube end surface 12c. 18 is not crushed. At the contact position a, the bulging portion 17 is not yet crushed by the pipe end surface 12c.

  Next, when the insertion portion 12 is further inserted into the tube back side from the contact position a shown in FIG. 4A, the anticorrosion member 14 is connected to the tube end surface 12 c of the insertion portion 12 and the depth of the receiving portion 5. The tube is pressed between the end surface 5d in the tube axis direction, and the bulging portion 17 is pressed and crushed by the tube end surface 12c, that is, elastic deformation of the bulging portion 17 is started.

  Then, as shown in FIG. 4B, when the tube end surface 12c reaches the position where the bulging portion 17 is completely crushed, that is, the covering start position b, the bulging portion 17 pressed by the tube end surface 12c. Since the abutment surface 17a is in close contact with substantially the entire region of the tube end surface 12c, the substantially entire region of the tube end surface 12c is covered with the abutment surface 17a.

  Also, as shown in FIG. 4B, the inner peripheral side of the anticorrosion member 14 is pushed out toward the tube axis C by the bulging portion 17 being crushed and elastically deformed toward the back end surface 5d side. Due to this deformation action, the inner peripheral contact portion 18 moves toward the inner peripheral surface 12b of the insertion portion 12, and the inner peripheral contact surface 18a contacts the inner peripheral surface 12b of the insertion portion 12.

  In this embodiment, as shown in FIG. 5 (a), the insertion port 12 has a receiving port 12c from the coating start position b to the insertion completion position c on the far side of the tube by the coating width dimension L1. The insertion operation is completed at the time when the insertion is made in the line 5. That is, by inserting the insertion portion 12 further deeply from the coating start position b and strongly crushing the anticorrosion member 14, the elastic return force of the anticorrosion member 14 is increased, and the water tightness of the pipe end surface 12c by the contact surface 17a is increased. improves. Furthermore, since the inner peripheral contact surface 18a is strongly pressed toward the inner peripheral surface 12b of the insertion portion 12, the water tightness of the inner peripheral surface 12b by the inner peripheral contact surface 18a is improved.

  In addition, about the guide part 16, the outer periphery of the insertion part 12 is elastically deformed by the accommodation groove 5f between the outer peripheral surface 12a of the insertion part 12 and the accommodation surface 5c of the receiving part 5, and the outer periphery of the insertion part 12 according to the compression. While the watertightness of the surface 12a and the receiving surface 5c of the receiving part 5 increases, the position shift of the axial center of the insertion part 12 with respect to the axial center of the receiving part 5 is regulated.

  Then, in the state where the tube end surface 12c has reached the insertion completion position c, the push bolt 9 is screwed from the outside of the arc groove 7 while maintaining this state, and the fixing claw 10 is pressed against the outer peripheral surface 12a of the insertion portion 12. The push-in bolt 9 is further screwed in, and the sharp blade 10a of the fixed claw 10 is pressed toward the tube axis C to bite into the outer peripheral surface 12a of the insertion portion 12, and the receiving portion 5 and the insertion portion 12 are connected. To do. Thereby, it will be in the control state in which removal of the insertion part 12 from the receiving part 5 was controlled.

  That is, the holding force of the fixed pawl 10 that is held in a state in which the movement of the insertion portion 12 with respect to the receiving portion 5 in the removal direction is restricted is greater than the elastic return force of the anticorrosion member 14.

  Therefore, in a state where the tube end surface 12c is located between the covering start position b and the insertion completion position c, the tube end surface 12c is always in close contact with the entire surface by the contact surface 17a of the bulging portion 17. Since it is in the covering state, the covering state in which the pipe end surface 12c is covered by the anticorrosive member 14 is maintained by restricting the removal of the insertion portion 12 from the receiving portion 5 by the removal restricting means 15.

  On the other hand, in the withdrawal restriction state shown in FIG. 5A, an unexpected external force such as an earthquake occurs, and the insertion portion 12 is removed from the receiving portion 5 in the removal direction (leftward in FIG. 5A). ), The tube end surface 12c of the insertion portion 12 has a restriction width from the insertion completion position c shown in FIG. 5 (a) to the removal restriction position d shown in FIG. 5 (b). Movement of dimension L2 is allowed.

  Specifically, the fixed pawl 10 is tiltable in the tube axis direction with the bottom surface of the push-in bolt 9 as a fulcrum in the arc groove 7, and the sharp blade 10 a formed at the distal end of the fixed pawl 10 is pulled out. By moving in the disengagement direction by the movement allowable width dimension L3, the sharp blade 10a bites into the outer peripheral surface 12a of the insertion portion 12 toward the tube axis C, and the side surface on the tube end opening side of the fixed pawl 10 is the arc groove 7 By coming into contact with the inner surface, the removal of the insertion portion 12 from the receiving portion 5 is regulated.

  Thus, as shown in FIG. 5B, the relative movement between the receiving portion 5 and the insertion portion 12 is allowed by the movement allowable width dimension L3 of the fixed claw 10, so that the pipe end surface 12c is The relative movement is possible between the insertion completion position c shown in FIG. 5 (a) and the removal restriction position d shown in FIG. 5 (b), and the allowable movement width dimension L3, the insertion completion position c, and the removal restriction position. The regulation width dimension L2 between them is the same dimension (L2 = L3). That is, in the present embodiment, in the state where the tube end surface 12c is located between the insertion completion position c shown in FIG. 5A and the removal restriction position d shown in FIG. The means 15 is in a removal restriction state in which the removal of the insertion opening 12 from the receiving opening 5 is restricted.

  Further, in the state where the tube end surface 12c is located at the insertion completion position c shown in FIG. 5A, the tube end surface 12c moves in the removal direction by the regulation width dimension L2 in the removal direction, and the removal restriction position d. Even if it is located at this position, this withdrawal / removal restriction position d is located between the coating start position b and the insertion completion position c where the coating state where the tube end surface 12c adheres substantially over the entire area by the anticorrosion member 14 is maintained. The state where the anticorrosion member 14 is in close contact with the tube end surface 12c is maintained following the tube end surface 12c by the elastic restoring force of the anticorrosion member 14.

  Thus, if the covering width dimension L1 that maintains the covering state is set to be longer than the regulation width dimension L2 (L3) that allows relative movement, the insertion portion 12 and the receiving portion 12 are received. Even when the mouth portion 5 is allowed to move relative to the predetermined width in a state where it is prevented from being removed, the coating state in which the tube end surface 12c is closely adhered to the entire area by the anticorrosion member 14 is maintained. Therefore, it is preferable to apply a pipe joint that satisfies the condition of L1> L3 as in this embodiment.

  As described above, in the pipe joint 1 of the present embodiment, the removal restricting means 15 regulates the removal of the insertion portion 12 from the receiving portion 5, and the insertion portion 12 from the receiving portion 5. The anticorrosion member 14 covers the tube end surface 12c in an elastically deformed state and the tube end surface 12c is pressed by its elastic restoring force, so that the anticorrosion member 14 seals the tube end surface 12c. Sex can always be maintained. In addition, when an unexpected external force is generated, the tube end surface can be moved even if the insertion portion 12 moves slightly relative to the reception portion 5 in a state where the removal of the insertion portion 12 from the reception portion 5 is restricted. 12c is always sealed by the anticorrosion member 14 that closely follows the tube end surface 12c by elastic return force.

  In this embodiment, since the contact surface 17a of the anticorrosion member 14 with the tube end surface 12c of the insertion portion 12 bulges toward the insertion portion 12 side, the anticorrosion member 14 is crushed by the tube end surface 12c. Not only is the insertion of the insertion portion 12 into the receiving portion 5 easier, but when the tube end surface 12c presses the contact surface 17a, the air between the tube end surface 12c and the contact surface 17a Since it is pushed out, deterioration of the adhesion between the tube end surface 12c and the contact surface 17a is prevented.

  In the present embodiment, the anticorrosion member 14 has a guide surface 16a extending continuously from the outer peripheral side end portion of the contact surface 17a with the tube end surface 12c of the insertion portion 12 toward the insertion portion side. The guide surface 16a is formed in a taper surface shape that gradually decreases in diameter toward the contact surface 17a. Thereby, when inserting the insertion portion 12 into the receiving portion 5, even if the insertion portion 12 is displaced from the axial center, the outer peripheral surface 12a of the insertion portion 12 is directed toward the axial center by the guide surface 16a. Since the tube end surface 12c abuts against the contact surface 17a without being displaced by being guided by sliding contact, the position of the tube end surface 12c relative to the corresponding contact surface 17a when the tube end surface 12c contacts the contact surface 17a. The step of correcting the deviation is unnecessary, and the contact surface 17a can reliably cover the tube end surface 12c only by the step of inserting the insertion portion 12 into the receiving portion 5.

  Further, the anticorrosion member 14 of the present embodiment has an inner peripheral contact surface that continuously extends from the inner peripheral side end portion of the contact surface 17a with the pipe end surface 12c of the insertion portion 12 toward the insertion portion 12 side. 18a is formed along the circumferential direction, and the inner peripheral contact surface 18a is in close contact with the inner peripheral surface 12b of the insertion portion 12 in a state where the anticorrosion member 14 covers the pipe end surface 12c. That is, the bulging portion 17 is elastically deformed by the tube end surface 12c, whereby the inner peripheral contact portion 18 moves toward the inner peripheral surface 12b of the insertion portion 12, and the inner peripheral contact surface 18a becomes the insertion portion. 12 is in contact with the inner peripheral surface 12b of the tube 12, so that the tube end surface 12c is not only covered, but the inner peripheral surface 12b of the insertion portion 12 is also covered, so that the fluid between the tube end surface 12c and the contact surface 17a is covered. It is possible to prevent entry more reliably.

  Further, in this embodiment, the inner peripheral contact surface 18a is formed in a tapered surface shape that gradually separates from the inner peripheral surface 12b of the insertion portion 12 toward the tip of the inner peripheral contact surface 18a. The member 14 is pressed and elastically deformed between the tube end surface 12c of the insertion portion 12 inserted into the reception portion 5 and the back end surface 5d of the reception portion 5, whereby the inner peripheral surface 12b of the insertion portion 12 is obtained. Therefore, when the insertion portion 12 is inserted into the receiving portion 5, the receiving opening is widened, so that the inner peripheral contact portion 18 is crushed by the inserted tube end surface 12c. The insertion portion 12 can be easily inserted into the receiving portion 5 without being deformed, and the inner peripheral abutting surface 18a is brought into contact with the inner peripheral surface 12b of the insertion portion 12 by elastic deformation caused by pressing of the tube end surface 12c. Without separately providing a member or the like for pressing against the inner peripheral surface 12b of the insertion portion 12 By the inner peripheral contact surface 18a only by utilizing elastic deformation of the corrosion protection member 14 an inner circumferential surface 12b of the inserting portion 12 can be reliably covered.

  Further, as shown in FIG. 4A, the tip of the guide portion 16 of the anticorrosion member 14 according to the first embodiment protrudes more toward the insertion portion 12 than the tip of the inner peripheral contact portion 18. Is preferred. By doing so, when the insertion portion 12 is inserted into the receiving portion 5, the outer peripheral surface 12 a of the insertion portion 12 is slidably guided by the guide surface 16 a before the tip of the inner peripheral contact portion 18. Since the positional deviation is corrected, the insertion portion 12 can be inserted into the receiving portion 5 without crushing the inner peripheral contact portion 18 with the tube end surface 12c.

  Further, since the inner peripheral abutting portion 18 in the first embodiment is formed so as to become gradually thinner toward the tip, the bulging portion 17 is pressed against the tube end surface 12c and the inner end of the insertion portion 12 is elastically deformed. In addition to being easily deformed toward the peripheral surface 12b, resistance due to fluid moving from the insertion portion 12 toward the receiving portion 5 is less likely to be applied in a state of being in close contact with the inner peripheral surface 12b. The tip of 18 becomes difficult to drown by the fluid.

  Next, the pipe joint according to the second embodiment will be described with reference to the drawings. FIG. 6A shows a state where the pipe end face of the insertion portion in the pipe joint of the second embodiment is not yet covered with the anticorrosion member. It is sectional drawing, (b) is sectional drawing which shows the state by which the insertion part was inserted in the insertion direction from the state of Fig.6 (a). FIG. 7A is a cross-sectional view showing a state in which the insertion portion is restricted from being inserted after the insertion portion is further inserted in the insertion direction from the state of FIG. 6B, and FIG. It is sectional drawing which shows the state which the part moved to the removal direction from the state of Fig.6 (a).

  The pipe joint according to the second embodiment is different only in the shape of the anticorrosion member, and the other configuration is substantially the same as the form of the pipe joint 1 shown in the first embodiment. The detailed description here will be omitted by attaching the reference numeral.

  As shown in FIG. 6 (a), the anticorrosion member 24 as Example 2 is made of an elastic rubber body formed in an annular shape and is formed in an L shape in cross section, and faces the pipe end surface 12c. A flat contact surface 27 that is substantially parallel to the tube end surface 12c is formed at the position.

  A guide portion 26 is formed on the outer peripheral side of the contact surface 27 along the circumferential direction so as to protrude from the outer peripheral end portion of the contact surface 27 toward the insertion portion 12. The inner peripheral surface is a guide surface 26a that is provided continuously from the outer peripheral edge of the contact surface 27 and extends toward the insertion portion 12 side. The guide surface 26a is formed by the insertion portion 12 at the receiving portion. In order to guide the outer peripheral surface 12 a of the insertion portion 12 toward the axis when inserted into the insertion portion 12, it is formed in a tapered surface shape that gradually decreases in diameter from the tip toward the contact surface 27.

  Moreover, the back surface 29 of the anticorrosion member 24 is formed substantially parallel to the back end surface 5d, and comes into close contact with the back end surface 5d in a state in which the insertion opening 12 is inserted as will be described later.

  Next, connection of the pipe joint 1 of Example 2 will be described. In addition, in the connection process of the pipe joint 1 of Example 2, the process which overlaps with the same process as the connection process of the pipe joint 1 of Example 1 is abbreviate | omitted and demonstrated.

  As shown in FIG. 6A, first, after the anticorrosion member 24 and then the seal member 8 are inserted and arranged in the receiving portion 5 from the tube end opening of the elbow tube 2, the insertion portion 12 is opened to the receiving portion. Insert into part 5.

  When the distal end of the insertion portion 12 reaches the distal end of the guide portion 26, the outer peripheral surface 12a at the opening end portion of the insertion portion 12 abuts on the guide surface 26a, and is then slidably guided to the guide surface 26a. As shown in FIG. 6B, the tube end surface 12c is securely attached to the contact surface 27 at the covering start position e where the tube end surface 12c contacts the contact surface 27, as shown in FIG. Abut.

  Here, since the contact surface 27 is formed in a flat shape, the tube end surface 12c is covered by the contact surface 27 over substantially the entire area when the tube end surface 12c contacts the contact surface 27.

  Next, when the insertion portion 12 is further inserted into the tube back side from the coating start position e, the anticorrosion member 24 is sandwiched between the tube end surface 12c and the back end surface 5d of the receiving portion 5 in the tube axis direction. The contact surface 27 is pressed by the pipe end surface 12c, and the anticorrosion member 24 starts to be elastically deformed, whereby the inner peripheral surface 28 side of the anticorrosion member 24 is mainly pushed out toward the tube axis C. In this state where the anticorrosion member 24 is crushed and elastic deformation is started, the elastic return force of the anticorrosion member 24 acts on the tube end surface 12 c, so that the tube end surface 12 c is brought into contact with the contact surface 27. It becomes the covering state to be coated.

  In this embodiment, as shown in FIG. 7 (a), the insertion end 12 has an insertion completion position where the tube end surface 12c is slightly further from the coating start position e by the coating width dimension L4. The insertion operation is completed when the insertion part 5 has been inserted up to f. That is, by inserting the insertion portion 12 in the insertion direction L4 from the coating start position e and crushing the anticorrosion member 24, the water tightness of the tube end surface 12c by the contact surface 27 is maintained. Furthermore, when the inner peripheral surface 28 side of the anticorrosion member 24 is pushed out in the direction of the tube axis C and bulges, the position near the contact surface 27 on the inner peripheral surface 12b of the insertion portion 12 bulges out. Is slightly covered with the inner peripheral surface 28 side, and is in a watertight state.

  Then, in a state where the tube end surface 12c has reached the insertion completion position f, the insertion portion 12 and the receiving portion 5 are connected by the removal restricting means 15 as in the first embodiment. As a result, the insertion state of the insertion portion 12 from the reception portion 5 is restricted, and in a state where the pipe end surface 12c is located between the covering start position e and the insertion completion position f, Since the tube end surface 12c is in close contact with the entire surface by the contact surface 27, the removal preventing means 15 regulates the removal of the insertion portion 12 from the receiving portion 5, so that the anticorrosion member 24 The covering state in which the tube end surface 12c is covered is maintained.

  On the other hand, in the withdrawal restriction state shown in FIG. 7A, an unexpected external force such as an earthquake occurs, and the insertion portion 12 is removed from the receiving portion 5 in the removal direction (leftward in FIG. 7A). ), The tube end surface 12c moves from the insertion completion position f shown in FIG. 7 (a) to the removal restriction position g shown in FIG. 7 (b) as in the first embodiment. It is permitted by the removal restriction means 15.

  That is, as shown in FIG. 7 (b), the relative movement between the receiving portion 5 and the insertion portion 12 is allowed by the movement allowable width dimension L6 of the fixed pawl 10. 7 (a) and relative displacement between an insertion completion position f shown in FIG. 7 (b) and an extraction / removal restriction position g shown in FIG. 7 (b). The regulation width dimension L5 between is the same (L5 = L6). That is, in the present embodiment, in the state where the tube end surface 12c is located between the insertion completion position f shown in FIG. 7A and the removal regulating position g shown in FIG. The means 15 is in a removal restriction state in which the removal of the insertion opening 12 from the receiving opening 5 is restricted.

  Further, in a state where the tube end surface 12c is located at the insertion completion position f shown in FIG. 7A, the tube end surface 12c moves in the removal direction by the regulation width dimension L5 in the removal direction, and the removal restriction position g. Even if it is located at this position, this removal restriction position g is located between the coating start position e and the insertion completion position f where the coating state where the tube end surface 12c is in close contact with substantially the entire region is maintained by the anticorrosion member 24. The state where the anticorrosion member 24 is in close contact with the pipe end surface 12c is maintained following the pipe end surface 12c by the elastic restoring force of the anticorrosion member 24.

  Thus, if the covering width dimension L4 for maintaining the covering state is set to be longer than the regulation width dimension L5 (L6) in which relative movement is allowed, the insertion portion 12 and the receiving portion 12 are received. Even when the mouth portion 5 is allowed to move relative to the predetermined width in a state where it is prevented from being removed, the coating state in which the tube end surface 12c is closely adhered and covered by the anticorrosion member 24 is maintained. Therefore, it is preferable to apply a pipe joint that satisfies the condition of L4> L6 as in this embodiment.

  As described above, in the pipe joint 1 according to the second embodiment, since the contact surface 27 of the anticorrosion member 24 is formed in a flat shape, when the insertion portion 12 is inserted into the reception portion 5, After the tube end surface 12c of the insertion portion 12 abuts, the elastic return force of the anticorrosion member 24 acts on the tube end surface 12c only by slightly inserting the tube end surface 12c in the insertion direction, so that the tube end surface 12c is substantially omitted. Since the entire region is covered with the contact surface 27, the dimension from the position where the tube end surface 12c contacts the anticorrosion member 24 to the insertion completion position f can be reduced, and the insertion portion 12 can be easily inserted. Become.

  Next, the pipe joint according to the third embodiment will be described with reference to the drawings. FIG. 8A shows a state where the pipe end face of the insertion portion in the pipe joint of the third embodiment is not yet covered with the anticorrosion member. It is sectional drawing, (b) is sectional drawing which shows the state by which the insertion part was inserted in the insertion direction from the state of Fig.8 (a), (c) is the state of an insertion part in FIG.8 (b) It is sectional drawing which shows the state by which the removal of the insertion part was controlled after having been further inserted in the insertion direction. In addition, the same structure as the said embodiment and the overlapping structure are abbreviate | omitted.

  The pipe joint according to the third embodiment is different only in the shape of the anticorrosion member, and the other configuration is substantially the same as the configuration of the pipe joint 1 shown in the first and second embodiments. Are denoted by the same reference numerals, and detailed description thereof will be omitted.

  As shown in FIG. 8A, the anticorrosion member 34 of Example 3 is formed of a rubber body having elasticity formed in an annular shape.

  A plurality of anticorrosion members 34 are provided in the radial direction on the contact surface side with the tube end surface 12c in the main body portion 35 formed along the circumferential direction on the back end surface 5d side of the receiving portion 5 (5 in this embodiment). I) A comb-shaped portion 37 formed of comb portions 37v, 37w, 37x, 37y, and 37z is formed.

  Specifically, each of the comb portions 37v, 37w, 37x, 37y, and 37z is formed with a plurality of concave grooves K having a predetermined depth L7 as an air gap on the contact surface side of the main body portion 35 with the tube end surface 12c. Are formed as annular comb portions having different diameters from the tube axis C and spaced apart from each other in the radial direction. In addition, among the comb portions 37v, 37w, 37x, 37y, and 37z, inner end surfaces of the comb portions 37w, 37x, and 37y are contact surfaces 37a that contact a tube end surface 12c of the insertion portion 12 described later. That is, the comb-shaped portion 37 of the anticorrosion member 34 is easily crushed by the tube end surface 12c because the elastic return force is structurally suppressed by the formation of voids by the plurality of concave grooves K.

  Moreover, the back surface 39 of the anticorrosion member 34 is formed substantially parallel to the back end surface 5d, and comes into close contact with the back end surface 5d in a state in which the insertion portion 12 is inserted as will be described later.

  Next, the connection of the pipe joint 1 of Example 3 will be described. In addition, in the connection process of the pipe joint 1 of Example 3, the process which overlaps with the same process as the connection process of the pipe joint 1 of Example 1 is abbreviate | omitted and demonstrated.

  Further, as shown in FIG. 8A, the tube end surface 12c is in contact with the contact surface h at the contact position h where the tube end surface 12c is in contact with the contact surface 17a of the bulging portion 17, as shown in FIG. 17a abuts.

  Next, when the insertion port 12 is further inserted into the back of the tube from the contact position h shown in FIG. 8A, the inner side of the combs 37v, 37w, 37x, 37y, and 37z that directly contacts the tube end surface 12c. The comb portions 37w, 37x, and 37y are sandwiched between the tube end surface 12c of the insertion portion 12 and the back end surface 5d of the receiving portion 5 in the tube axis direction, as shown in FIG. 8B. The tube end surface 12c is crushed and elastically deformed.

  Further, the comb portions 37v and 37w are pushed out toward the housing groove 5f, and the comb portions 37y and 37z are pushed out toward the inner peripheral surface 12b of the insertion portion 12. That is, the comb-shaped portion 37 in the anticorrosion member 34 is crushed by the tube end surface 12c and elastically deformed.

  In this embodiment, when the pipe end surface 12c reaches the coating start position i on the pipe depth side from the contact position h by the predetermined depth L7, only the central comb part 37x is completely piped between the comb parts 37w and 37y. It is crushed by the end surface 12c, and the inner surface of the concave groove K between the comb portions 37w and 37y is in close contact with and covered with substantially the entire region of the tube end surface 12c. That is, not the contact surface 37a at the tip of the comb portions 37w, 37x, 37y, but the vicinity of the bottom of the concave groove K in the anticorrosion member 34 contacts the tube end surface 12c to cover the tube end surface 12c. The outer peripheral comb portions 37v and 37w are in close contact with the outer peripheral surface 12a, and the inner peripheral comb portions 37y and 37z are in close contact with the inner peripheral surface, so that a wide range of watertightness is achieved from the tube end surface 12c to the inner peripheral surface 12b. It becomes.

  In this embodiment, as shown in FIG. 8 (c), the insertion portion 12 has a receiving portion where the tube end surface 12c extends from the coating start position i to the insertion completion position m on the far side of the tube by the coating width dimension L8. The insertion operation is completed at the time when the insertion is made in the line 5. That is, by inserting the insertion portion 12 further deeply from the coating start position i and strongly crushing the anticorrosion member 34, the elastic return force of the anticorrosion member 34 is increased, and the watertightness of the anticorrosion member 34 and the pipe end surface 12c is improved. To do. Further, since the comb portion 37z is strongly pressed toward the inner peripheral surface 12b, the water tightness of the inner peripheral surface 12b in the comb portion 37z is improved.

  In addition, about the comb parts 37v and 37w, by elastically deforming in the accommodation groove 5f between the outer peripheral surface 12a of the insertion part 12, and the accommodation surface 5c of the receiving part 5, according to the compression of the insertion part 12 of the insertion part 12 While watertightness of the outer peripheral surface 12a and the receiving surface 5c of the receiving part 5 increases, the position shift of the axial center of the insertion part 12 with respect to the axial center of the receiving part 5 is controlled.

  And by restricting the removal of the insertion portion 12 from the receiving portion 5 by the removal restriction means 15, the tube end surface 12 c is covered with the comb-shaped portion 37 of the anticorrosion member 34 being elastically deformed. Since it always presses against the pipe end face 12c by the elastic restoring force, the pipe end face 12c is reliably covered by the anticorrosion member 34.

  Accordingly, in the state where the tube end surface 12c is located between the covering start position i and the insertion completion position m, the tube end surface 12c is always in close contact with the anticorrosion member 34 over substantially the entire region. By restricting the removal of the insertion portion 12 from the receiving portion 5 by the removal restriction means 15, the covering state in which the pipe end surface 12 c is covered by the anticorrosion member 34 is maintained.

  As described above, in the pipe joint according to the third embodiment, the concave groove K is formed in the contact surface 37a of the anticorrosion member 34 with the pipe end surface 12c of the insertion portion 12 toward the inside. Since the comb-shaped portion 37 is easily crushed by the tube end surface 12c, the insertion portion 12 can be easily inserted. Moreover, regardless of the material hardness of the anticorrosion member 34, if the concave groove K having a predetermined depth L7 is formed, the insertion depth of the insertion opening 12 can be arbitrarily changed.

  Moreover, since the comb-shaped part 37 is formed in the contact surface side with the pipe end surface 12c in the anticorrosion member 34, in the state in which removal of the insertion part 12 from the receiving part 5 is controlled, the pipe end surface 12c. Is not only covered by the anticorrosion member 34, but the comb-shaped portion 37 is elastically deformed so as to be in close contact with the inner peripheral surface 12b of the insertion portion 12, and the inner peripheral surface 12b is also covered. The entry of fluid can be more reliably prevented.

  Further, in the third embodiment, in the vicinity of the contact surface 37a of the anticorrosion member 34, a concave groove K (gap) communicating with the outside is formed inward from the contact surface side to suppress the elastic restoring force and form a comb shape. By forming the portion 37, the anticorrosion member 34 is easily crushed when the insertion portion 12 is inserted into the receiving portion 5. However, the present invention is not limited to this, for example, the contact surface inside the anticorrosion member 34 Even if a gap that does not communicate with the outside is formed in the vicinity of 37a, the same action and effect can be obtained.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the first to third embodiments, since the anticorrosion members 14, 24, and 34 and the seal member 8 are provided separately and are arranged at a predetermined distance from each other in the tube axis direction, the insertion portion In the state in which 12 is inserted, each elastically deforms separately, and the elastically deformed portions do not interfere with each other and do not affect each other. In other words, the elastically deformed anticorrosion members 14, 24, and 34 interfere with the seal member 8 to hinder watertightness, or conversely, the elastically deformed seal member 8 interferes with the anticorrosion members 14, 24, and 34 and There is no problem in covering the end face 12c.

  For the seal member 8, an elastic material having elasticity suitable for preventing leakage of fluid from between the outer peripheral surface 12 a of the insertion portion 12 and the inner peripheral surface of the receiving portion 5 is selected, and the anticorrosion member 14 is selected. Since an elastic material having elasticity suitable for corrosion prevention of the tube end surface 12c can be selected, the corrosion of the tube end surface 12c and the gap between the outer peripheral surface 12a of the insertion portion 12 and the inner peripheral surface of the receiving portion 5 can be selected. It is possible to efficiently prevent fluid from leaking out.

  In addition, the seal member 8 and the anticorrosion members 14, 24, and 34 are integrally formed to prevent fluid leakage from between the outer peripheral surface 12 a of the insertion portion 12 and the inner peripheral surface of the receiving portion 5. At the same time, it may be an anticorrosive member that can prevent the corrosion of the tube end surface 12c of the insertion portion 12, and in such a case, the member can be attached to the receiving portion 5 only once, so that field work is facilitated. .

  Moreover, in the said Example 1, although the annular bulging part which the center part of radial direction bulges in the insertion part 12 side rather than both ends was formed, for example, the bulging part is not necessarily formed in cyclic | annular form. The plurality of bulging portions may protrude from the contact surface with the tube end surface toward the tube end surface along the circumferential direction.

  Moreover, in the said Examples 1-3, although the rubber body which consists of a rubber material which has an elastic deformation force suitably was applied as the anticorrosion members 14, 24, 34, elastic return force with respect to the crushed pipe end surface 12c The material is not limited to rubber, and various elastic materials can be applied, as long as they can be covered with water to form a watertight state.

  Moreover, in the said Examples 1-3, although the anticorrosion member 14, 24, 34 whole was formed with the same raw material, for example, only the contact surface vicinity with a pipe end surface is soft compared with another site | part. It may be formed of a rubber material to make it easy to be crushed, or only the vicinity of the contact surface with the pipe end surface is formed of a rubber material having a higher resilience than other parts to provide an elastic restoring force. You may make it improve.

  In Example 3, the concave groove K is formed in an annular shape and a plurality of comb-shaped portions 37 are formed in the radial direction. However, if the elastic return force can be suppressed by the concave groove, for example, the diameter A plurality of concave grooves facing the direction may be formed at predetermined intervals in the circumferential direction, thereby forming a plurality of comb-shaped portions facing the radial direction.

  Further, the removal restricting means in the above embodiment is constituted by the bolt hole 5b, the pushing bolt 9 for pushing the fixing claw 10, the fixing claw 10, and the arc groove 7 in which the fixing claw 10 is accommodated. As long as the insertion part 12 inserted into the receiving part 5 is restricted from being removed from the receiving part 5, the invention is not limited to the above-mentioned removal restricting means. Other extraction restriction means such as those provided separately from the mouth portion 5 may be used.

It is the schematic which shows the arrangement | positioning condition of the pipe joint in Example 1 of this invention. It is sectional drawing which shows a receptacle part and an insertion part. (A) is a front view showing an anticorrosion member, (b) is a right side view showing the anticorrosion member, (c) is a left side view showing the anticorrosion member, and (d) is FIG. It is AA sectional drawing of (c). (A) is sectional drawing which shows the state by which the pipe end surface of the insertion part is not yet coat | covered with the anticorrosion member, (b) is an insertion part inserted in the insertion direction from the state of Fig.4 (a). It is sectional drawing which shows the state. (A) is a cross-sectional view showing a state in which the insertion portion is further inserted from the state shown in FIG. 4 (b) in the insertion direction and then the removal of the insertion portion is restricted, and FIG. It is sectional drawing which shows the state which moved to the removal direction from the state of Fig.5 (a). (A) is sectional drawing which shows the state in which the pipe end surface of the insertion part in the pipe joint of Example 2 is not yet coat | covered with the anticorrosion member, (b) is an insertion part of FIG. 6 (a). It is sectional drawing which shows the state inserted in the insertion direction from the state. (A) is a cross-sectional view showing a state in which the insertion portion is restricted from being removed after the insertion portion is further inserted in the insertion direction from the state of FIG. 6 (b), and FIG. It is sectional drawing which shows the state which moved to the removal direction from the state of Fig.6 (a). (A) is sectional drawing which shows the state by which the pipe end surface of the insertion part in the pipe joint of Example 3 is not yet coat | covered with the anticorrosion member, (b) is an insertion part of FIG. 8 (a). Sectional drawing which shows the state inserted in the insertion direction from the state, (c) is a state in which the removal of the insertion portion is restricted after the insertion portion is further inserted in the insertion direction from the state of FIG. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe joint 5 Receiving part 5d Inner end surface 12 Inserting part 12b Inner peripheral surface 12c Pipe end surface 14 Corrosion prevention member 15 Withdrawal restricting means 16 Guide part 16a Guide surface 17 Swelling part 17a Contact surface 18 Inner peripheral contact part 18a Inner peripheral contact surface K

Claims (5)

An insertion portion having a pipe end surface constituting one fluid pipe;
The insertion port portion is inserted, and a receiving port portion that constitutes the other fluid pipe having an accommodation surface that is substantially parallel to the tube axis on the inner peripheral surface and an annular back end surface;
Withdrawal restricting means for restricting removal of the insertion portion inserted into the receiving portion from the receiving portion;
An anti-corrosion member comprising an elastic material formed in an annular shape, disposed between the tube end surface of the insertion portion, the receiving surface of the receiving portion and the back end surface, and elastically deformed by being pressed ;
With
A pipe joint for connecting the one fluid pipe and the other fluid pipe in a watertight state,
In the anticorrosion member, a guide surface extending toward the insertion port side continuously from the outer peripheral side end portion in the contact surface with the tube end surface of the insertion port portion is formed along the circumferential direction. The guide surface is formed in a tapered surface shape that gradually decreases in diameter toward the contact surface,
The corrosion member, in a state in which pull-out is restricted in the insertion opening portion from the socket part by the pull-out regulating means, nearly the entire area of the tube end surface of the spigot portion which is inserted into the socket part It arrange | positions so that it may oppose the said contact surface, and it covers between the said tube end surface by pressing between the said tube end surface , the said receiving surface of the said receiving part, and the said back end surface, and elastically deforms, and the said anticorrosion member pipe joint inner circumferential surface, characterized that you contact the inner peripheral surface of the inserted pipe by extrusion deformed toward the tube axis of the.   2. The pipe joint according to claim 1, wherein the contact surface of the insertion preventing portion with the pipe end surface of the anticorrosion member bulges toward the insertion opening side.   The pipe joint according to claim 1 or 2, wherein a gap is formed in the vicinity of a contact surface of the anticorrosion member with the pipe end face of the insertion portion. The anticorrosion member is formed with an inner peripheral contact surface extending in the circumferential direction continuously from the inner peripheral side end portion of the contact surface with the tube end surface of the insertion port portion toward the insertion port side. And
Said inner circumferential abutment surface, at least the corrosion protection member according to any one of 3 claims 1 is characterized in that close contact with the inner circumferential surface of the spigot portion in a state in which covering the tube end face Pipe fittings. The inner circumferential abutment surface is formed in a tapered surface shape that gradually separates from the inner circumferential surface of the insertion portion toward the tip of the inner circumferential abutment surface,
The anticorrosion member is pressed between the tube end surface of the insertion portion inserted into the receiving portion and the inner end surface of the receiving portion to be elastically deformed, thereby contacting the inner peripheral surface of the insertion portion. It is comprised so that it may contact | connect, The pipe joint of Claim 4 characterized by the above-mentioned.

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