JP5019971B2 - 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 tube end surface with anticorrosion paint after cutting, but since the work load at the site increases, as a solution to such problems, for example, between the insertion tube and the receiving tube By inserting a common tubular anticorrosion member straddling and making the space between the inner peripheral surface of the insertion tube and the receiving tube and the outer peripheral surface of the tubular anticorrosion member, the tube end surface of the insertion tube (For example, refer to Patent Document 1).

Japanese Patent No. 3138926 (page 4, Fig. 1)

  However, the anticorrosion member described in Patent Document 1 corrodes the tube end face of the insertion tube by bringing the outer periphery of the cylindrical portion into close contact with the inner peripheral surfaces of the insertion tube and the receiving tube to prevent water from entering. Since it is necessary to insert a cylindrical anticorrosive member across the receiving tube and the insertion tube, the connection work between the insertion tube and the reception tube becomes complicated, and the insertion There is a problem that the structure of the anticorrosion member becomes complicated because the outer peripheral surface of the cylindrical anticorrosion member needs to be brought into close contact with the inner peripheral surface of the insertion tube and the receiving tube later.

  The present invention has been made paying attention to such problems, and a pipe joint that can reliably prevent water from entering the pipe end face without complicating the connection work between the insertion part and the receiving part. The purpose is to provide.

In order to solve the above problem, a pipe joint according to claim 1 of the present invention is
An insertion portion constituting one fluid pipe,
The insertion port is inserted, and an annular housing surface that is substantially parallel to the tube axis is formed on the inner peripheral surface, and a back end surface that is connected to the housing surface and is substantially perpendicular to the tube axis of the fluid pipe is formed. A receiving portion that constitutes the other fluid pipe having a step formed by the accommodation surface and the back end surface ;
It is made of an elastic material formed in an annular shape, and is disposed between the tube end surface and the back end surface of the insertion portion, and comes into contact with the tube end surface of the insertion portion inserted into the receiving portion. An anticorrosion member having a contact surface covering the end surface;
With
A pipe joint for connecting the one fluid pipe and the other fluid pipe in a watertight state,
On the outer peripheral side of the engaging portion of the anticorrosion member , an outer peripheral surface and a rear surface that are engaged with the receiving surface and the inner end surface of the receiving portion are formed along the circumferential direction, on the housing surface of the outer peripheral surface of the engaging portion is an inner circumferential surface of the socket portion, the back of the engaging portion is engaged with the back end surface of the inner peripheral surface of the socket portion, said socket portion By utilizing the step formed by the housing surface and the back end surface, the installation position of the anticorrosion member with respect to the receiving portion is determined,
A guide surface extending toward the insertion port side is formed on the inner peripheral side of the engaging portion of the anticorrosion member, and the tube of the insertion port portion is formed on the inner peripheral surface side of the anticorrosion member. The contact surface that contacts the end surface is formed, the tube end surface of the insertion portion is guided by the guide surface of the anticorrosion member, and the contact surface of the anticorrosion member is formed by the tube end surface and the back end surface. Is elastically deformed by being pinched in the tube axis direction, the inner peripheral surface side of the contact surface is pushed out and bulged in the fluid tube axis direction, and the inner peripheral surface of the insertion portion is covered by the contact surface. It is characterized in that it is made as to that.
According to this feature, the engagement portion engages with the inner peripheral surface of the receiving portion by inserting the anticorrosion member into the receiving portion using the step formed by the receiving surface and the back end surface of the receiving portion. Thus, since the anticorrosion member is installed without being displaced at the installation position in the receiving part, the pipe end surface of the insertion part inserted into the receiving part can be reliably brought into contact with the anticorrosion member and covered. Moreover, the anticorrosion of the tube end surface of the insertion portion can be prevented by a simple operation by installing the anticorrosion member in the receiving portion and inserting the insertion portion guided by the guide surface of the anticorrosion member. Since the anticorrosion member does not get in the way, such as when the anticorrosion member is inserted into the insertion portion when the insertion portion is inserted into the reception portion, the connection work between the insertion portion and the reception portion becomes easy. . Then, the contact surface of the anticorrosion member is clamped in the tube axis direction by the tube end surface of the insertion portion and elastically deformed, and the inner peripheral surface side of the contact surface is pushed out in the fluid tube axis direction to bulge, As a result, the inner peripheral surface of the insertion portion is covered, water tightness is improved, and corrosion of the pipe end surface can be prevented.

The pipe joint according to claim 2 of the present invention is the pipe joint according to claim 1,
On the back surface of the engagement portion of the anticorrosion member, an engagement convex portion is formed along the tube axis direction at a position facing the back end surface of the receiving portion, and on the back end surface, An engaged portion with which the engaging convex portion is engaged is formed.
According to this feature, it is possible to greatly increase the engagement extension in which the engaging portion and the inner peripheral surface of the receiving portion engage, and the anticorrosion member can be firmly installed in the receiving portion, and the rear end face Since the position shift of the anticorrosion member can be reliably prevented, the position shift when the pipe end surface of the insertion portion and the anticorrosion member abut can be effectively prevented. The contact surface of the anticorrosion member with the back end surface is in contact with the contact surface of the anticorrosion member at the back end surface with the back end surface, and the engaging portion is an inner peripheral surface of the receiving portion on the tube back side with respect to the back end surface. Since the anticorrosion member is installed in the receiving portion by abutting, the engaging portion is engaged using the existing step formed on the inner end surface of the inner end surface and the receiving portion. without performing any special processing or the like on the inner peripheral surface of the mouth portion, positional deviation of the anticorrosive members Ru is reliably prevented.

The pipe joint according to claim 3 of the present invention is the pipe joint according to claim 1 or 2,
The engaging convex portion is characterized in that it extends so as to be able to engage with the inner peripheral surface on the tube back side with respect to the back end surface.
According to this feature, the contact surface of the anticorrosion member with the back end surface is in contact with the back end surface, and the engaging portion is in contact with the inner peripheral surface of the receiving portion closer to the opening end than the back end surface. Therefore, the engaging portion is engaged using the existing step formed on the inner end surface of the rear end surface and the receiving portion, and the position shift of the anticorrosion member is reliably prevented. . Further, when inserting the insertion portion into the receiving portion, even if the insertion portion may deviate from the axis, it is slidably guided toward the axis using the inner peripheral surface of the engagement portion, It can be reliably cover the pipe end face by corrosion member and that Do.

  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 an enlarged cross-sectional view showing a state in which the anticorrosion member is not yet attached to the receiving part, and FIG. 4B is an enlarged cross-sectional view showing a state in which the anticorrosion member is inserted into the receiving part. (C) is an enlarged sectional view showing a state where the anticorrosion member is mounted at the installation position. Fig.5 (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 in the insertion direction from the state of Fig.5 (a). It is sectional drawing which shows the state inserted. FIG. 6A 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. 5B, 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).

  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 12 d) is substantially the same as the inner diameter of the inner peripheral surface 5 g of the elbow pipe 2 on the inner side of the elbow pipe 2. The diameter is slightly smaller than the inner diameter of the receiving port 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.

  A concave portion 5 a provided along the circumferential direction on the opening end side of the elbow pipe 2 is formed inside the receiving portion 5 of the elbow pipe 2 to which the seal member 8 and the anticorrosion member 14 are attached. Although not particularly shown, a coating layer is provided in a thin layer on the inner peripheral surface forming the interior of the receiving portion 5 as well as the insertion portion 12.

  A housing surface 5c that is substantially parallel to the tube axis C is formed on the inner peripheral surface on the back side of the tube with respect to the recess 5a. From the end of the housing surface 5c on the back side of the tube, the diameter is smaller than that of the housing surface 5c. A rear end surface 5d that is substantially perpendicular to the tube axis C is formed so as to be connected to the inner peripheral surface 5g. That is, a step is formed between the accommodation surface 5c and the back end surface 5d. A concave groove 50 opened on the open end side of the existing receiving portion 5 is specially processed in an annular shape on the rear end surface 5d. The concave groove 50 has an engagement convex portion 21 of the anticorrosion member 14 described later. It is formed as an engaged portion to be fitted (see FIG. 4C).

  As shown in FIG. 4A, the outer peripheral surface 50a of the groove 50 is formed in a tapered surface shape that gradually decreases in diameter toward the end surface 50b, and the inner peripheral surface 50c faces the end surface 50b. In other words, the groove 50 is formed so as to gradually expand toward the opening end side of the receiving portion 5, and an engaging convex portion 21 described later is concave. When engaged with the groove 50, the engaging convex portion 21 is easily inserted into the concave groove 50.

  As shown in FIG. 2, the seal member 8 includes a fitting portion 8 a that is fitted in a recess 5 a that is formed along the circumferential direction on the inner peripheral surface of the receiving portion 5, and the inner periphery of the receiving portion 5. And a valve portion 8c for watertightly sealing a gap between the surface and the outer peripheral surface 12a of the insertion portion 12 to be inserted into the receiving portion 5, and the outer diameter is substantially the same as the inner diameter of the receiving portion 5. It consists of a ring body having a diameter and a rubber body having elasticity (see FIG. 5A).

  The seal member 8 has a fitting portion 8a fitted in a recess 5a formed on the inner peripheral surface of the receiving portion 5 in the circumferential direction (see FIG. 5A). In the fitted state, as shown in FIG. 2, the insertion portion 12 of the straight tube 11 is not yet inserted, and the valve portion 8c is not compressed, and the cross-sectional shape is formed in a substantially circular shape. In addition, the inner peripheral surface bulges toward the tube axis C as compared with the fitting portion 8a.

  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 FIGS. 2 and 3A to 3C, the anticorrosion member 14 is made of an elastic rubber body formed in an annular shape, and the anticorrosion member 14 is shown in FIG. 3D. Thus, it is formed in the cross-sectional view substantially 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. 5A). .

  As shown in FIGS. 2 and 3 (a) to 3 (d), the inner periphery of the anticorrosion member 14 protrudes from the inner peripheral end of the contact surface 17a toward the insertion port 12 side. The contact part 18 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 tube end surface 12c, the taper surface is formed so as to gradually separate from the inner peripheral surface 12b of the insertion portion 12 (see FIG. 5A). It is comprised so that it may closely_contact | adhere to the internal peripheral surface 12b of the part 12. FIG.

  As shown in FIGS. 3A to 3D and 4C, the back surface 19 of the anticorrosion member 14 is formed substantially parallel to the back end surface 5d, and the insertion portion 12 is inserted as will be described later. In this state, it is in close contact with the back end surface 5d to prevent fluid leakage.

  On the back surface 19, an engagement convex portion 21 as an engagement portion formed in an annular shape is provided so as to project toward the groove 50 at a position facing the back end surface 5 d, and an anticorrosion member is provided on the outer peripheral side of the back surface 19. In the state in which 24 is installed in the receiving portion 5, an engaging portion 16 is formed as an engaging portion that extends from the back end surface 5d to the opening end side of the receiving portion 5 and is formed in an annular shape. As will be described later, the installation position where the anticorrosion member 14 is installed can be determined in a state where the back end surface 5d and the back surface 19 are in contact with each other (see FIG. 4C).

  The outer peripheral surface 21a of the engaging convex portion 21 is formed in a tapered surface shape that gradually decreases in diameter toward the end surface 21b, and the inner peripheral surface 21c is formed in a tapered surface shape that gradually increases in diameter toward the end surface 21b. In other words, the engagement convex portion 21 is gradually reduced in diameter toward the end surface 21 b, so that the engagement convex portion 21 can be easily inserted into the groove 50.

  The end surface 21b is formed so as to contact the end surface 50b of the concave groove 50 in a state before the insertion portion 12 is inserted (see FIG. 4C).

  Further, the peripheral surface of the engaging portion 16 on the bulging portion 17 side, that is, the inner peripheral surface of the engaging portion 16 is continuously provided from the outer peripheral edge of the contact surface 17a and extends toward the insertion portion 12 side. The guide surface 16a is a distal end for guiding the outer peripheral surface 12a of the insertion portion 12 toward the axial center when the insertion portion 12 is inserted into the receiving portion 5. Is formed in a tapered surface shape that gradually decreases in diameter toward the contact surface 17a.

  The outer diameter of the anticorrosion member 14 is formed to be approximately the same as the inner diameter of the receiving surface 5c of the receiving portion 5, and is mounted and received in the receiving portion 5 as shown in FIG. 4 (c). In the state, the outer peripheral surface 20 of the engaging portion 16, which is the outer peripheral surface of the anticorrosion member 14, comes into 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.

  First, as shown in FIGS. 4A and 4B, the anticorrosion member 14 is inserted into the receiving portion 5 from the tube end opening of the elbow tube 2. When inserted into the tube back side of the receiving part 5, the tube back side tip of the engaging part 16 of the anticorrosion member 14 comes into contact with the receiving surface 5c of the receiving part 5, and the anticorrosion member 14 is further moved to the pipe back side. By inserting, the outer peripheral surface 20 of the engaging portion 16 comes into contact with the receiving surface 5 c of the receiving portion 5, and the anticorrosive member 14 is inserted with the axis of the anticorrosive member 14 aligned with the axial center of the receiving portion 5. It will be.

  When the anticorrosion member 14 is further inserted into the back side of the pipe, the end surface 21b reaches the opening of the groove 50 as shown in FIG. In this state, the outer peripheral surface 21a and the inner peripheral surface 21c of the engaging convex portion 21, and the outer peripheral surface 50a and the inner peripheral surface 50c of the groove 50 are respectively tapered surfaces that reduce in diameter toward the back side of the tube. Since the groove is formed in a shape, the opening of the groove 50 is widened, and the engagement protrusion 21 is easily fitted in the groove 50.

  4B, when the anticorrosion member 14 is further inserted into the inner side of the pipe, the tapered outer peripheral surface 21a and the inner peripheral surface 21c of the engagement convex portion 21 are formed in the concave groove 50. As shown in FIG. 4C, the back surface 19 of the anticorrosion member 14 has a back end surface 5d as guided in sliding contact toward the inside of the groove 50 by the tapered outer peripheral surface 50a and the inner peripheral surface 50c. It is installed at the installation position where it abuts.

  In the state of FIG. 4C, the outer peripheral surface 21a, the end surface 21b, the inner peripheral surface 21c and the outer peripheral surface 50a, the end surface 50b, and the inner peripheral surface 50c abut securely. That is, since the engaging convex part 21 fits in the concave groove 50 without play, the movement of the anticorrosive member 14 in the radial direction and the tube axis direction toward the inner side of the pipe is restricted, and as a result, the anticorrosive member 14 becomes concave. 50, the position of the anticorrosion member 14 is reliably prevented from being displaced.

  Further, in a state where the engagement convex portion 21 is fitted in the concave groove 50, that is, in a state where the anticorrosion member 14 is installed at the installation position, the back surface 19 is in contact with the back end surface 5d, and the engagement projection The state where the outer peripheral surface 20 of the portion 21 is in contact with the accommodation surface 20c is maintained. In this installed state, the engaging portion 16 is engaged with the back end surface 5d and the housing surface 5c by using the existing step formed on the back end surface 5d and the housing surface 5c, and the engaging convex portion 21 is engaged. In addition to engaging with the concave groove 50, it is possible to reliably prevent displacement of the anticorrosion member 14 in the radial direction and in the tube axis direction toward the tube back side.

  In this embodiment, the end surface 21b of the engaging convex portion 21 and the end surface 50b of the concave groove 50 are in contact with each other in a state where the anticorrosion member 14 is fitted in the concave groove 50. The end face 21b may not be brought into contact with the end face 50b of the recessed groove 50, and a gap may be formed.

  Then, after the anticorrosion member 14 is installed, the seal member 8 is inserted into the receiving portion 5 from the opening end of the receiving portion 5 of the elbow pipe 2, and the fitting portion 8 a is fitted into the concave portion 5 a of the receiving portion 5. (See FIG. 5A). 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. While being in sliding contact with the fitting portion 8 a, the valve portion 8 c is inserted into the receiving portion 5, and the valve portion 8 c is compressed in the gap between the outer peripheral surface 12 a of the inserting portion 12 and the inner peripheral surface of the receiving portion 5. 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 engagement portion 16, the outer peripheral surface 12a at the opening end of the insertion portion 12 abuts on the guide surface 16a, It is inserted toward the inner side of the pipe while being guided in sliding contact with the guide 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. 5A, 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 in contact 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 an engaging 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 opening of the circumferential contact portion 18 is widened, the insertion end 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 18 is inserted by the tube end surface 12c. Will not be 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. 5A, 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.

  As for the engaging projections 21 and 16, even when the elastic deformation of the bulging portion 17 is started, the engaging projection 21 is engaged with the concave groove 50, and the engaging portion 16 is accommodated in the receiving surface 5 c. And since it engages with the back end surface 5d, the anticorrosion member 14 is crushed without the axial center of the anticorrosion member 14 being displaced.

  As shown in FIG. 5B, when the tube end surface 12c reaches the position where the bulging portion 17 is completely crushed, that is, the coating 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. Even in this covered state, the engagement of the engagement convex portion 21 and the engagement portion 16 ensures that the tube end surface 12c is brought into contact with the contact surface 17a without causing the anticorrosion member 14 to be displaced. Is coated.

  Further, as shown in FIG. 5B, the inner peripheral side of the anticorrosion member 14 is pushed out toward the tube axis C by the bulging portion 17 being crushed toward the back end surface 5d and elastically deforming. 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. 6 (a), the insertion portion 12 has a receiving portion where the tube end surface 12c extends from the covering start position b to the insertion completion position c further to the covering 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 engaging part 16, the outer peripheral surface 12a of the insertion part 12 according to the compression is carried out by elastically deforming in the clearance gap between the outer peripheral surface 12a of the insertion part 12, and the accommodating surface 5c of the receiving part 5. And the accommodating surface 5c of the receiving portion 5 are increased, and the positional deviation of the shaft center of the insertion portion 12 with respect to the shaft center of the receiving portion 5 is restricted.

  As described above, as shown in FIG. 6A, in this embodiment, the end surface of the engaging convex portion 21 in the state where the anticorrosion member 14 is installed at the installation position where the back surface 19 abuts the back end surface 5d. 21b and the end surface 50b of the concave groove 50 are in contact, but when a gap is provided between the end surface 21b and the end surface 50b so that the end surface 21b does not contact the end surface 50b, the tube end surface 12c is elastically deformed. The clearance can be used as a clearance for a part of the anticorrosion member 14, and even if the anticorrosion member 14 is pressed by the pipe end surface 12c, the movement of the anticorrosion member 14 in the tube axis direction is restricted, and the anticorrosion member 14 is in the installation position. The state where it is installed is maintained.

  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. 6A, 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. 6A). ), The tube end surface 12c of the insertion portion 12 has a restriction width from the insertion completion position c shown in FIG. 6A to the removal restriction position d shown in FIG. 6B. 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. 6 (b), the relative movement between the receiving portion 5 and the insertion portion 12 is allowed by the allowable movement 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. 6 (a) and the removal restriction position d shown in FIG. 6 (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. 6A 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 a state where the tube end surface 12c is located at the insertion completion position c shown in FIG. 6A, 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 anticorrosion member 14 includes the engagement convex portion 21 that engages with the concave groove 50 of the receiving portion 5 and the back end surface 5d of the receiving portion 5. And an engaging convex portion that engages with the receiving surface 5c are formed along the circumferential direction, and the engaging convex portion 21 and the engaging portion 16 are engaged with the concave groove 50, the back end surface 5d, and the receiving surface 5c, respectively. By combining, the installation position of the anticorrosion member 14 with respect to the receiving portion 5 is determined. By doing in this way, since the anticorrosion member 14 is installed in the installation position where the back surface 19 abuts on the back end surface 5d without being displaced, the pipe end surface 12c of the insertion portion 12 inserted into the receiving portion 5 is protected against the anticorrosion member 14. Can be reliably abutted on and coated. Further, the anticorrosion of the tube end surface 12c of the insertion portion 12 can be achieved by a simple operation of installing the anticorrosion member 14 in the receiving portion 5 and inserting the insertion portion 12, and the insertion portion as in the prior art. Since the anticorrosion member does not get in the way, for example, the anticorrosion member is inserted into the insertion portion when inserting the mouthpiece into the opening portion, the connection work between the insertion portion and the reception portion becomes easy.

  Further, in the present embodiment, the engaging convex portion 21 is provided at a position facing the deep end surface 5d of the anticorrosion member 14, and a concave groove 50 for engaging the engaging convex portion 21 is formed on the deep end surface 5d. Since it is formed, the displacement of the anticorrosion member 14 with respect to the back end surface 5d can be reliably prevented, so that the displacement of the tube end surface 12c of the insertion portion 12 when the anticorrosion member 14 abuts can be effectively prevented.

  Further, in the present embodiment, the engaging portion 16 extends so as to be engageable with the accommodating surface 5c on the opening end side of the receiving portion 5 with respect to the back end surface 5d. By doing in this way, while the back surface 19 of the anticorrosion member 14 contacts the back end surface 5d, the engaging portion 16 contacts the receiving surface 5c closer to the opening end of the receiving portion 5 than the back end surface 5d. Since it is installed in the portion 5, the engaging portion 16 is engaged by utilizing the existing step formed on the back end surface 5 d and the receiving surface 5 c, and the position shift of the anticorrosion member 14 is surely prevented. Is done. Further, when the insertion portion 12 is inserted into the receiving portion 5, the tube end surface 12 c is inserted into the receiving portion 5 along the inner peripheral surface of the engaging portion 16. Even if there is a deviation, the inner peripheral surface of the engaging portion 16 is used for sliding contact toward the axial center, and the pipe end surface 12c can be reliably covered with the anticorrosion member 14.

  In particular, in the engaging portion 16 of the present embodiment, the guide surface 16a of the insertion portion 12 is formed in a tapered 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, in this embodiment, the removal restricting means 15 regulates the removal of the insertion portion 12 from the receiving portion 5, and in the state where the removal of the insertion portion 12 from the receiving portion 5 is restricted, 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. Therefore, the sealability of the tube end surface 12c can always be maintained by the anticorrosion member 14. 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.

  Further, in the present embodiment, the anticorrosion member 14 has an inner peripheral contact that continuously extends from the inner peripheral end of the contact surface 17a with the pipe end surface 12c of the insertion portion 12 toward the insertion portion 12 side. The surface 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 opening is widened, so that the inner peripheral contact portion 18 is crushed by the inserted tube end surface 12 c. The insertion portion 12 can be easily inserted into the receiving portion 5 without any contact, and the inner peripheral abutment surface 18a is abutted against the inner peripheral surface 12b of the insertion portion 12 by elastic deformation caused by pressing of the tube end surface 12c. Without 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, in this embodiment, the anticorrosion member 14 is inserted into the receiving portion 5 before the insertion portion 12 is inserted, the engagement convex portion 21 is engaged in the concave groove 50, and the back surface 19 is the back end surface 5d. The insertion port 12 is inserted and the anticorrosion member 14 is pressed in the state where the insertion projection 12 is fitted in the concave groove 50 after being installed at the installation position in contact with the concave portion 50. Since the groove 50 is open toward the tube axis direction and the engaging convex portion 21 is formed in the tube axis direction, for example, at least a part of the engaging convex portion 21 is fitted into the concave groove 50. If so, even if the anticorrosion member 14 is pushed in, it can be installed at the installation position where the back surface 19 abuts against the back end surface 5d. Further, the outer peripheral surface 21a and the inner peripheral surface 21c of the engaging convex portion 21 and the outer peripheral surface 50a and the inner peripheral surface 50c of the concave groove 50 are each formed in a tapered surface shape that is reduced in diameter toward the back side of the tube. Therefore, even if the anticorrosion member 14 is pushed in, the anticorrosion member 14 is moved without displacement while being guided in the axial direction by the engagement convex portion 21 and the concave groove 50 using this tapered surface. The anticorrosion member 14 can be reliably installed at the installation position where the back surface 19 abuts against the back end surface 5d.

  Further, in the present embodiment, the tip of the engaging portion 16 of the anticorrosion member 14 protrudes toward the insertion portion 12 rather than the tip of the inner peripheral abutting portion 18 as shown in FIG. 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, in this embodiment, the inner peripheral abutting portion 18 is formed so as to become gradually thinner toward the tip, so that the bulging portion 17 is pressed against the tube end surface 12c and elastically deformed so that Not only is it easy to deform toward the inner peripheral surface 12b, but resistance to the fluid moving from the insertion portion 12 toward the receiving portion 5 is less likely to occur when in close contact with the inner peripheral surface 12b. The tip of the portion 18 is less likely to be swollen by the fluid.

  Next, the pipe joint according to the second embodiment will be described with reference to the drawings. FIG. 7A is a front view showing the anticorrosion member of the second embodiment, and FIG. 7B is a right side view showing the anticorrosion member. (C) is a left side view showing the anticorrosion member, and (d) is a BB sectional view of FIG. 7 (c). FIG. 8 is an enlarged cross-sectional view illustrating a state in which the anticorrosion member is not yet attached to the receiving portion. FIG. 9 is an enlarged cross-sectional view showing a state where the anticorrosion member is inserted into the receiving portion. FIG. 10 is an enlarged cross-sectional view showing a state in which the anticorrosion member is mounted at the installation position. FIG. 11 is a cross-sectional view illustrating a state in which the pipe joint is configured.

  The pipe joint according to the second embodiment is substantially the same as the form of the pipe joint 1 shown in the first embodiment, except that the shape of the anticorrosion member and the shape of the receiving portion are only partially different. The same components are denoted by the same reference numerals, and detailed description thereof is omitted here.

  As shown in FIGS. 8 and 11, the receiving portion 5 that constitutes the pipe joint 1 in the second embodiment is processed such that the groove 50 or the like as the engaged portion in the first embodiment is formed on the back end surface 5 d. There is a gap between the receiving surface 5c and the back end surface 5d, and there is a step between the inner peripheral surface 5g and the back end surface 5d.

  As shown in FIGS. 7A to 7D, the anticorrosion member 24 of Example 2 is formed from a rubber body having elasticity formed in an annular shape, and at a position facing the pipe end surface 12c, A flat contact surface 27 that is substantially parallel to the tube end surface 12c is formed (see FIG. 10).

  Further, as shown in FIGS. 7A to 7D and FIGS. 8 to 10, the back surface 29 side of the anticorrosion member 24 includes a support piece 25 d and a fin 25 a for positioning the anticorrosion member 24. The joint projecting portion 25 is formed in an annular shape toward the inner side of the pipe, and the engagement projecting portion 25 is continuous with the rear end surface 5d in a state where the anticorrosion member 24 is installed in the receiving port portion 5, It is adapted to be engaged with an inner peripheral surface 5g formed with a constant inner diameter R toward the inner side of the tube.

  Specifically, the inner surface of the back surface 29 of the anticorrosion member 24 is continuous with the inner peripheral surface 28 of the anticorrosion member 24 and extends toward the back end surface 5d side, that is, the anticorrosion member 24 is the receiving portion 5. A support piece 25d extending from the back end surface 5d to the back side of the pipe in the state of being installed in the pipe is formed along the circumferential direction (see FIG. 11). In addition, a peripheral surface 25b having an outer diameter dimension T is formed on the support piece 25d as an outer peripheral surface. The outer diameter dimension T of the peripheral surface 25b is determined when the anticorrosion member 24 is installed in the receiving portion 5. The inner diameter R is smaller than the inner diameter R so that it can be easily inserted into the inner peripheral surface 5g (T <R).

  Further, a plurality of fins 25a projecting from the circumferential surface 25b in the radial direction are formed along the circumferential direction (three in this embodiment at predetermined intervals). Moreover, the peripheral surface 25c which has the outer diameter dimension S is formed in this fin 25a as an outer peripheral surface, and in the state in which the anticorrosion member 24 was installed in the receiving part 5, this fin 25a and the inner peripheral surface 5g It is designed to be engaged. As will be described later, in this engaged state, the fin 25a is elastically deformed, and the outer diameter S of the peripheral surface 25c is set to the inner diameter in order to prevent displacement of the anticorrosion member 24 by contacting the inner peripheral surface 5g. The diameter is larger than the dimension R (S> R).

  In addition, on the outer peripheral side of the engagement projecting portion 25 of the anticorrosion member 24, the anticorrosion member 24 is extended from the back end surface 5 d to the opening end side of the receiving portion 5 in a state where the anticorrosive member 24 is installed in the receiving portion 5. The engaging portion 26 is formed in an annular shape along the circumferential direction. As will be described later, the engaging portion 26 is engaged with the receiving surface 5 c of the receiving portion 5. Further, the peripheral surface of the engagement portion 26 on the contact surface 27 side, that is, the inner peripheral surface of the engagement portion 26 is continuously provided from the outer peripheral edge of the contact surface 27 and extends toward the insertion portion 12 side. The guide surface 26a is a distal end for guiding the outer peripheral surface 12a of the insertion portion 12 toward the axial center when the insertion portion 12 is inserted into the receiving portion 5. The taper is formed in a tapered shape that gradually decreases in diameter from the contact surface 27 toward the contact surface 27.

  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.

  First, when the anticorrosion member is inserted into the receiving port 5 from the tube end opening of the elbow pipe 2 (see FIG. 8), and the anticorrosion member 24 is further inserted into the tube inner side of the receiving port 5, the engagement of the anticorrosion member 24 is achieved. The distal end of the joint portion 26 on the back side of the tube abuts on the receiving surface 5 c of the receiving portion 5, and the anticorrosion member 24 is inserted on the back side of the tube, whereby the outer peripheral surface 30 of the engaging portion 26 is The anticorrosion member 24 is inserted with the housing surface 5 c in contact with the axis of the anticorrosion member 24 aligned with the axis of the receiving portion 5.

  Further, when the anticorrosion member 24 is inserted into the inner side of the pipe, the distal end of the support piece 25d on the inner side of the pipe is inserted into the inner peripheral surface 5g of the receiving portion 5. Since the outer diameter T of the peripheral surface 25b of the support piece 25d is smaller than the inner diameter R of the inner peripheral surface 5g, the support piece 25d is easily inserted into the inner peripheral surface 5g.

  Further, when the anticorrosion member 24 is inserted into the tube back side of the receiving portion 5, as shown in FIG. 9, the fin 25a on the tube back side of the fin 25a comes into contact with the inner peripheral surface 5g and is elastically deformed to receive the receiving port. The engagement projecting portion 25 is inserted while maintaining a state in contact with the inner peripheral surface 5g of the portion 5.

  Next, the anticorrosion member 24 is further inserted into the inner side of the pipe, so that the fins 25a abut in order from the inner side of the pipe, are elastically deformed, and the engaging projecting portion 25 is inserted into the inner peripheral surface 5g. The fin 25a is elastically deformed and comes into contact with the inner peripheral surface 5g. Since the outer diameter S of the peripheral surface 25c of the fin 25a is larger than the inner diameter R of the inner peripheral surface 5g in this contact state, the inner peripheral surface 5g is pressed by the elastic return force of the fin 25a.

  And as FIG. 10 shows, the anticorrosion member 24 is inserted to the installation position where the back surface 19 contact | abuts the back end surface 5d.

  Thereby, since the inner peripheral surface 5g is pressed by the elastic restoring force of the fin 25a, the fin 25a is engaged with the inner peripheral surface 5g by this pressing force, and the movement of the radial anticorrosion member 24 is restricted, and the anticorrosion member. 24 can be installed in the receiving part 5 without positional deviation.

  In addition, in the state where the anticorrosion member 24 is installed at the installation position where the back surface 19 contacts the back end surface 5d, the back surface 29 contacts the fin 25a and the fin 25a contacts the inner peripheral surface 5g. The engaging portion 26 is engaged with the back end surface 5d and the receiving surface 5c by using the existing step formed on the peripheral surface 5g, and in addition to the elastic return force of the fin 25a, the radial direction and the tube back side The position shift of the anticorrosion member 24 in the direction of the tube axis toward the tube can be reliably prevented.

  As for the engaging portion 26, the back surface 29 contacts the back end surface 5 d in a state where the anticorrosion member 24 is installed at the installation position where the back surface 19 contacts the back end surface 5 d, and the engaging portion 26 contacts the receiving surface 5 c. In order to abut, the engaging portion 26 is engaged with the back end surface 5d and the receiving surface 5c using the existing step formed on the back end surface 5d and the receiving surface 5c. The position shift prevention of the anticorrosion member 24 in the direction of the tube axis toward the tube improves.

  Next, after the anticorrosion member 24 is installed in the receiving portion 5, the seal member 8 is inserted and arranged, and the insertion portion 12 is inserted into the receiving portion 5.

  When the distal end of the insertion portion 12 reaches the distal end of the engaging portion 26, the outer peripheral surface of the opening end portion of the insertion portion 12 contacts the guide surface 26a, and is slidably guided to the guide surface 26a. At the coating start position e (see FIG. 11) where the tube end surface 12c is inserted toward the inner side of the tube and the tube end surface 12c contacts the contact surface 27, the tube end surface 12c reliably contacts the contact surface 27.

  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 the present embodiment, as shown in FIG. 11, the insertion opening 12 receives the tube end surface 12c from the coating start position e to the insertion completion position f slightly on the back side of the pipe by a coating width dimension L4. The insertion operation is completed when the insertion is made in the mouth portion 5. 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.

  As described above, in the pipe joint 1 according to the second embodiment, the pipe joint 1 extends so as to be able to engage with the inner peripheral surface 5g on the pipe back side with respect to the back end face 5d. By doing in this way, while the back surface 19 is contact | abutted with the back end surface 5d, the engagement protrusion part 25 is contact | abutted with the inner peripheral surface 5g of the receiving part 5 of the pipe | tube back side rather than the back end surface 5d, and a receiving part Since the engagement projecting portion 25 is installed in the inner surface 5, the engagement portion engages with the existing step formed on the inner end surface 5 g of the rear end surface 5 d and the receiving port portion 5. Thus, the position shift of the anticorrosion member 24 is reliably prevented without performing special processing or the like on the inner peripheral surface of the receiving portion 5.

  In Example 2, 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 receiving portion 5, the tube end surface 12 c of the insertion portion 12 is contacted. After the contact, just inserting the tube end surface 12c slightly in the insertion direction causes the elastic return force of the anticorrosion member 24 to act on the tube end surface 12c, so that the substantially entire area of the tube end surface 12c is covered by the contact surface 27. Therefore, the dimension from the position where the pipe 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.

  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.

  Moreover, in the said Example 1, although the engagement convex part 21 protrudes and is formed in the back surface 19 of the anticorrosion member 14, it is not restricted to this, For example, it is in the back surface 19 in the pipe | tube back side of the receiving part 5. While providing the opening engagement recessed part, the convex part fitted by this engagement recessed part is formed in the back end surface 5d toward the opening end side of the receiving part 5, and the said anticorrosion member 14 is installed in the state. The anticorrosion member may be positioned by fitting the engaging concave portion into the convex portion. As long as the engaging portion engages with the inner peripheral surface of the receiving portion 5 as described above, the engaging portion may be formed in either a convex shape or a concave shape.

  In the first embodiment, the concave groove 50 is formed to gradually expand toward the opening end side of the receiving portion 5. However, the present invention is not limited to this, and the concave groove is opposite to the concave groove 50. Further, it may be formed so as to be gradually closed toward the opening end side of the receiving portion. By doing so, since the opening of the concave groove becomes narrow, the engagement convex portion appropriately formed corresponding to the concave groove can be prevented from coming out after fitting into the concave groove, and the predetermined installation The anticorrosion member does not move from the position.

  In the first and second embodiments, the engaging convex portion 21, the engaging projecting portion 25, and the engaging portions 16, 26 are formed along the pipe axis direction. Convex portion 21, engaging projecting portion 25 and engaging portions 16, 26 and inner peripheral surface of receiving portion (engaging convex portion 21 is outer peripheral surface 50a, inner peripheral surface 50c, engaging projecting portion 25 is inner The peripheral surface 5g and the engaging portions 16 and 26 can be greatly extended in engagement with the receiving surface 5c.), And the anticorrosion member 14 can be firmly installed in the receiving portion 5. Further, the present invention is not limited to this, and may be disposed anywhere as long as it is an engaging convex portion that engages with the inner peripheral surface of the receiving portion. For example, it is formed between the contact surfaces 17a and 27 and the back surfaces 19 and 29. A fin as in the second embodiment may be formed in the radial direction on the outer periphery or the like.

  In the first and second embodiments, the engaging convex portion 21, the engaging projecting portion 25, and the engaging portions 16, 26 are formed in an annular shape, but the engaging portion is not limited to the outer peripheral surface. It may be formed at predetermined intervals along the direction, or may be formed such that fins as in Example 2 are scattered on the outer periphery of the anticorrosion member 14. Further, it is more preferable that the engaged portion is formed corresponding to the position where the engaging portion is engaged.

  For example, in the first and second embodiments, the anticorrosion members 14 and 24 and the seal member 8 are provided separately and are arranged in a state of being separated from each other by a predetermined distance in the tube axis direction. In the inserted state, 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 and 24 interfere with the seal member 8 to hinder watertightness. Conversely, the elastically deformed seal member 8 interferes with the anticorrosion members 14 and 24 and covers the pipe end surface 12c. There will be no troubles.

  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 and 24 are integrally formed to prevent leakage of fluid from between the outer peripheral surface 12a of the insertion portion 12 and the inner peripheral surface of the receiving portion 5, An anticorrosion member that can prevent the corrosion of the tube end surface 12c of the insertion portion 12 may be used. In such a case, the member can be attached to the receiving portion 5 only once, so that the installation 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.

  In the first and second embodiments, a rubber body made of a rubber material having an appropriate elastic deformation force is applied as the anticorrosion members 14 and 24. However, the crushed tube end surface 12c is covered with an elastic return force. As long as it can form a watertight state, the material is not limited to rubber, and various elastic materials can be applied.

  In the first and second embodiments, the anticorrosion members 14 and 24 are entirely formed of the same material. However, for example, only the vicinity of the contact surface with the pipe end surface is softer than other portions. It may be easily formed by crushing, or only the vicinity of the contact surface with the pipe end surface is formed of a rubber material having higher resilience than other parts to improve the elastic restoring force. You may do it.

  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 an expanded sectional view which shows the state by which the anticorrosion member is not yet mounted | worn by the receptacle part, (b) is an expanded sectional view which shows the state by which the anticorrosion member is inserted in the receptacle part (C) is an expanded sectional view which shows the state by which the anti-corrosion member was mounted | worn in the installation position. (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.5 (a). It is sectional drawing which shows 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. 5 (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 a front view which shows the anticorrosion member of Example 2, (b) is a right view which shows an anticorrosion member, (c) is a left view which shows an anticorrosion member, (d) These are BB sectional drawings of Drawing 7 (c). FIG. 8 is an enlarged cross-sectional view illustrating a state in which the anticorrosion member is not yet attached to the receiving portion. It is an expanded sectional view showing the state where the anticorrosion member is not yet attached to the mouthpiece. It is an expanded sectional view which shows the state by which the anticorrosion member is inserted in the receiving part. It is an expanded sectional view which shows the state with which the anticorrosion member was mounted | worn in the installation position. It is sectional drawing which shows the state by which the pipe joint was comprised.

Explanation of symbols

1 Pipe Fitting 5 Receiving Portion 5c Housing Surface (Inner Peripheral Surface of Receiving Portion)
5d Back end surface 5g Inner peripheral surface (inner peripheral surface of the receiving portion)
12 Insertion Portion 12c Pipe End Surface 14 Anticorrosion Member 16 Engagement Part 21 Engagement Convex Part (engagement part)
25 Engagement projection (engagement part)
50 Groove (engaged part)

Claims (3)

An insertion portion constituting one fluid pipe,
The insertion port is inserted, and an annular housing surface that is substantially parallel to the tube axis is formed on the inner peripheral surface, and a back end surface that is connected to the housing surface and is substantially perpendicular to the tube axis of the fluid pipe is formed. A receiving portion that constitutes the other fluid pipe having a step formed by the accommodation surface and the back end surface ;
It is made of an elastic material formed in an annular shape, and is disposed between the tube end surface and the back end surface of the insertion portion, and comes into contact with the tube end surface of the insertion portion inserted into the receiving portion. An anticorrosion member having a contact surface covering the end surface;
With
A pipe joint for connecting the one fluid pipe and the other fluid pipe in a watertight state,
On the outer peripheral side of the engaging portion of the anticorrosion member , an outer peripheral surface and a rear surface that are engaged with the receiving surface and the inner end surface of the receiving portion are formed along the circumferential direction, on the housing surface of the outer peripheral surface of the engaging portion is an inner circumferential surface of the socket portion, the back of the engaging portion is engaged with the back end surface of the inner peripheral surface of the socket portion, said socket portion By utilizing the step formed by the housing surface and the back end surface, the installation position of the anticorrosion member with respect to the receiving portion is determined,
A guide surface extending toward the insertion port side is formed on the inner peripheral side of the engaging portion of the anticorrosion member, and the tube of the insertion port portion is formed on the inner peripheral surface side of the anticorrosion member. The contact surface that contacts the end surface is formed, the tube end surface of the insertion portion is guided by the guide surface of the anticorrosion member, and the contact surface of the anticorrosion member is formed by the tube end surface and the back end surface. Is elastically deformed by being pinched in the tube axis direction, the inner peripheral surface side of the contact surface is pushed out and bulged in the fluid tube axis direction, and the inner peripheral surface of the insertion portion is covered by the contact surface. pipe fitting, characterized in that it is so that. On the back surface of the engagement portion of the anticorrosion member, an engagement convex portion is formed along the tube axis direction at a position facing the back end surface of the receiving portion, and on the back end surface, pipe joint of claim 1, wherein the engagement protrusion, characterized in that the engaged portion to be engaged is formed. The engaging protrusions, the pipe joint according to claim 1 or 2, characterized in that it is engageable to extend to the inner peripheral surface of Kan'oku side of the back end surface.

Images