JP2009024852A - Pipe coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe coupling capable of easily and surely holding an anticorrosive means in a spigot part, without processing an anticorrosive member or the spigot part with a tool. <P>SOLUTION: A holding part 10 has a holding surface 10c composed of a construction material elastically undeformable more than the anticorrosive member 9 and opposed to at least a part of an end surface of the spigot part 4 by sandwiching an end surface covering part 9a of the anticorrosive member 9, and an opposed peripheral surface 10e opposed to an inner peripheral surface 4b or an outer peripheral surface 4a of the spigot part 4 by continuing with the holding surface 10c, and are arranged in the peripheral direction of the anticorrosive member 9. The holding part 10 is installed in the spigot part 4 by using elastic restoring force in the radial direction for turning the opposed peripheral surface 10e to the inner peripheral surface 4b or the outer peripheral surface 4a of the spigot part 4, and holds a covering state of covering the end surface 4c of the spigot part 4 with the end surface covering part 9a of the anticorrosive member 9 by the holding surface 10c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe joint that connects one fluid pipe and the other fluid pipe in a watertight state.

  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, for example, on the end face part of the insertion opening (insertion part) An annular anticorrosion core (corrosion prevention member) that is U-shaped in cross section is fitted, and an anticorrosion core fixture (fixing member) is fitted from the outside of the anticorrosion core, and the anticorrosion core fixture is fixed with a clam vise etc. After drilling a hole that penetrates the anticorrosion core from the outside of the anticorrosion core fixture with a drill, and screwing a bolt into the prepared hole, the inner side in the radial direction of the anticorrosion core fixture provided in the anticorrosion core fixture There exists what extended the nail | claw tool inside the anticorrosion core, inserted the anticorrosion core, and was fixed to the opening | mouth (for example, refer patent document 1).

JP 2006-275206 A (page 4, FIG. 1)

  However, in Patent Document 1, in order to fix the anticorrosion core (anticorrosion member), after fixing the anticorrosion core fixture (holding portion) with a giant clam vise, etc., from the outside of the anticorrosion core fixture with a drill. There was a problem that a pilot hole penetrating the anticorrosion core was to be opened and a bolt was screwed into the pilot hole, which increased the number of processes.

  The present invention has been made paying attention to such problems, and a tube capable of easily and reliably holding the anticorrosion means in the insertion portion without adding a hand to the anticorrosion member or the insertion portion with a tool or the like. The object is to provide a joint.

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,
An anticorrosion member comprising an elastic material formed in an annular shape and having an end surface covering portion that covers the end surface of the insertion portion,
A receiving portion constituting the other fluid pipe into which the insertion portion whose end surface is covered by the anticorrosion member is inserted, and
A pipe joint for connecting the one fluid pipe and the other fluid pipe in a watertight state,
A holding surface that is made of a material that is less elastically deformed than the anticorrosion member and faces at least a part of the end surface of the insertion portion across the end surface covering portion of the anticorrosion member, and the insertion port continuous to the holding surface A holding portion having an inner peripheral surface or an opposing peripheral surface facing the outer peripheral surface of the portion, is provided along the circumferential direction of the anticorrosion member,
The holding portion is attached to the insertion portion using a radial elastic return force in which the opposing peripheral surface faces the inner peripheral surface or the outer peripheral surface of the insertion portion. The end surface covering portion maintains the covering state that covers the end surface of the insertion portion.
According to this feature, the holding surface of the holding portion faces the end surface of the insertion portion with the end surface covering portion of the anticorrosion member interposed therebetween, so that the holding portion can be positioned with respect to the insertion portion, and the opposing circumference of the holding portion By utilizing the elastic return force in the radial direction where the surface faces the inner or outer peripheral surface of the insertion portion, the anticorrosion member can be covered without being deformed by the holding portion made of a material that is less elastically deformed than the anticorrosion member. The state can be easily and reliably maintained.

The pipe joint according to claim 2 of the present invention is the pipe joint according to claim 1,
The opposing peripheral surface of the holding portion is extended to face only the inner peripheral surface of the insertion portion.
According to this feature, the opposing peripheral surface of the holding portion extends to face only the inner peripheral surface of the insertion portion, and the outer diameter of the insertion portion after attaching the holding portion is attached to the holding portion. Since it can maintain as before, it is easy to connect the insertion part equipped with the holding part to the receiving part.

The pipe joint according to claim 3 of the present invention is the pipe joint according to claim 1 or 2,
The said anti-corrosion member has the surrounding surface coating | coated part which coat | covers the inner peripheral surface or outer peripheral surface of the said insertion part continuously with the said end surface coating | coated part.
According to this feature, the peripheral surface covering portion of the anticorrosion member can cover the inner peripheral surface or the outer peripheral surface continuous to the end surface of the insertion portion. It is possible to cover almost the whole area.

A pipe joint according to a fourth aspect of the present invention is the pipe joint according to the third aspect,
The opposed peripheral surface of the holding portion is characterized by pressing toward the inner peripheral surface or the outer peripheral surface of the insertion portion with the peripheral surface covering portion of the anticorrosion member interposed therebetween.
According to this feature, the opposing peripheral surface of the holding portion presses the peripheral surface covering portion of the anticorrosion member toward the inner peripheral surface or the outer peripheral surface of the insertion portion by the elastic restoring force in the radial direction. Since the portion can be brought into close contact with the inner peripheral surface or the outer peripheral surface of the insertion portion, the end surface covering portion continuous to the peripheral surface covering portion can be reliably prevented from corroding the fluid and the end surface of the insertion portion can be reliably prevented.

The pipe joint according to claim 5 of the present invention is the pipe joint according to claim 3 or 4,
The peripheral surface covering portion of the anticorrosion member covering the inner peripheral surface of the insertion portion facing the opposing peripheral surface of the holding portion or the peripheral surface opposite to the outer peripheral surface is formed in a thin film shape. It is characterized by being.
According to this feature, the end surface of the insertion portion is covered with the end surface covering portion in a state where the peripheral surface covering portion of the anticorrosion member formed in a thin film shape is slid outward from the insertion portion with respect to the end surface covering portion. In addition, since the covering state is held by the holding portion, and the inner peripheral surface or the outer peripheral surface of the insertion portion can be covered by the peripheral surface covering portion after that, the outer diameter of the insertion portion can be maintained even after mounting. The anticorrosion member formed in the above can be easily attached to the insertion portion.

A pipe joint according to a sixth aspect of the present invention is the pipe joint according to any one of the first to fifth aspects,
The shape of the holding portion when viewed in the tube axis direction is substantially C-shaped.
According to this feature, both ends of the holding part formed in a substantially C-shape can be close to each other to be reduced in diameter, or separated from each other to be increased in diameter, and the holding part and the anticorrosive member in the reduced or increased diameter state. Since the anticorrosion member is uniformly pressed along the circumferential direction by the elastic return force of the holding portion by attaching the anticorrosion member to the insertion portion, the anticorrosion member is inserted with the axial center of the anticorrosion member and the insertion portion surely aligned. Can be installed on the mouth.

  Examples of the present invention will be described below.

  An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a cross-sectional view showing a pipe joint in Embodiment 1 of the present invention, and FIG. 2 (a) is a front view showing anticorrosion means. 2 (b) is a side view showing the anticorrosion means, FIG. 3 (a) is an AA sectional view showing the anticorrosion means in FIG. 2 (a), and FIG. 3 (b) is FIG. It is the elements on larger scale which show the anticorrosion means in (a), FIG.4 (a) is sectional drawing which shows the state by which anticorrosion means is mounted | worn in an insertion part, FIG.4 (b) is shown in an insertion part. FIG. 4 (c) is a cross-sectional view showing a state in which the anticorrosion means is mounted with the outer side turned up, FIG. 4 (c) is a cross-sectional view showing a state in which the anticorrosion means is attached to the insertion portion, and FIG. It is the elements on larger scale which show the anticorrosion means in 4 (c), and FIG. 6 is assembly sectional drawing which shows a pipe joint. Hereinafter, the right side of FIG. 1, FIG. 4, and FIG. 5 will be described as the front side of the pipe joint.

  Reference numerals 1 and 1 ′ in FIG. 1 denote fluid pipes 1 and 1 ′ that are part of a fluid pipe such as water and sewage, gas, etc. that are disposed in the basement or the like to which the pipe joint 2 of the present invention is applied. is there. The fluid pipes 1 and 1 ′ have the same configuration and can be connected to each other, and both ends of the fluid pipes 1 and 1 ′ are connected by inserting one fluid pipe into the other fluid pipe. A receiving portion 3 having a large diameter formed at one end and an inserting portion 4 formed at the other end, and the inserting portion 4 is inserted into the receiving portion 3 so that the tube A part of the joint 2 is formed. Further, an anticorrosion paint is applied to the surfaces (inner peripheral surface, outer peripheral surface, and tube end surface before cutting the end portion described later) of the fluid pipes 1 and 1 ', and an anticorrosion coating layer (not shown) is formed in a thin film. Yes.

  As shown in FIG. 1, the pipe joint 2 in this embodiment includes an insertion port 4 constituting one fluid pipe 1, and anticorrosion means 6 for preventing corrosion of the tube end surface 4 c as an end surface of the insertion port 4. From between the receiving port 3 constituting the other fluid pipe 1 ′ and between the inner peripheral surface 3 a of the receiving port 3 having elasticity and the outer peripheral surface 4 a of the insertion port 4 inserted into the receiving port 3. The seal member 5 is configured to prevent the fluid from leaking out, and the removal regulating means 7 that regulates the removal of the insertion port 4 from the receiving port 3.

  Although the connection of the pipe joint 2 will be described later, the insertion portion 4 is inserted into the receiving portion 3 in the insertion direction toward the right side in FIG. 1, and the removal restricting means 7 connects the receiving portion 3 to the insertion portion 4. Regulate withdrawal. Hereinafter, the direction from the left side to the right side of FIG. 1 will be described as the insertion direction.

  As shown in FIG. 1, the inner diameter of the insertion portion 4 is substantially the same as the inner diameter of the inner peripheral surface 3 a on the back side of the tube of the receiving portion 3, and the outer diameter of the insertion portion 4 is a receiving port described later. The diameter is slightly smaller than the inner diameter of the accommodating surface 3c of the portion 3. In addition, the distal end of the insertion port 4 has a tube end surface 4 c formed along the circumferential direction continuous to the outer peripheral surface 4 a of the insertion port 4 and the inner peripheral surface 4 b of the insertion port 4. . In addition, the fluid pipe 1 is formed by appropriately cutting the end portion thereof according to the necessity of the configuration of the pipe line, and this pipe end surface 4c is formed by cutting the end portion that the fluid pipe 1 has conventionally had. Is the exposed surface.

  A recess 3b provided along the circumferential direction on the opening end side of the fluid tube 1 'is formed inside the receiving port 3 of the fluid tube 1' to which the seal member 5 is attached. Although not particularly shown, a coating layer is provided on the inner peripheral surface forming the inside of the receiving portion 3 in the same manner as the insertion portion 4.

  A housing surface 3c that is substantially parallel to the tube axis C is formed on the inner peripheral surface on the back side of the tube relative to the recess 3b. From the end of the housing surface 3c on the back side of the tube, the diameter is smaller than that of the housing surface 3c. A rear end surface 3d that is substantially perpendicular to the tube axis C is formed so as to be connected to the inner peripheral surface 3a. That is, a step is formed between the accommodation surface 3c and the back end surface 3d.

  As shown in FIG. 1, the seal member 5 includes a fitting portion 5 a that is fitted in a recess 3 b that is formed along the circumferential direction on the inner peripheral surface of the receiving portion 3, and the inner peripheral surface of the receiving portion 3. And a valve portion 5b that seals the gap between the insertion portion 4 inserted into the receiving portion 3 and the outer peripheral surface 4a of the insertion portion 4 in a watertight state. The seal member 5 is made of a ring body having an outer diameter that is substantially the same as the inner diameter of the receiving portion 3, and is made of an elastic rubber body. The valve portion 5b made of a rubber body is formed in a substantially circular shape in cross section. When the fitting portion 5a of the seal member 5 is fitted into the concave portion 3b of the receiving portion 3, it is compared with the fitting portion 5a. Thus, the inner peripheral surface bulges toward the tube axis C.

  The pull-out restricting means 7 is orthogonal to the tube axis C from the outside of the fluid pipe 1 ′, and a plurality of bolt holes 7 a formed at predetermined intervals in the circumferential direction on the outer peripheral surface near the outer end of the receiving portion 3. A plurality of push bolts 7b screwed into the bolt holes 7a toward the direction, and a plurality of push bolts 7b on the inner peripheral surface near the outer end of the receiving portion 3 at predetermined intervals in the circumferential direction. An arc groove 7c and a plurality of fixed pawls 8 disposed in the arc groove 7c and having a sharp edge 8a at the tip thereof are constituted. With this withdrawal / removal restricting means 7, the receiving port 3 and the insertion port 4 are connected, and the removal of the insertion port 4 from the receiving port 3 can be regulated.

  Further, in a state where the insertion portion 4 is not inserted, the sharp blade 8a of the fixed claw 8 is outward from the inner peripheral surface of the receiving portion 3 so as not to interfere with the insertion of the insertion portion 4 described later. Evacuated. The push-in bolt 7b is not necessarily screwed in a direction orthogonal to the tube axis C, and may be screwed in a direction parallel to or oblique to the tube axis C.

  As shown in FIGS. 2A and 2B, the anticorrosion means 6 is formed in an annular shape. The anticorrosion means 6 includes an anticorrosion member 9 made of an annular rubber body that is elastic and easily deformed, and a metal material that is provided in an annular shape along the circumferential direction of the anticorrosion member 9 and is less elastically deformed than the anticorrosion member 9 The holding part 10 which consists of is comprised. Since the holding portion 10 is provided along the circumferential direction of the anticorrosion member 9, the anticorrosion member 9 can maintain the shape shown in FIGS. 3 (a) and 3 (b). The holding part is not necessarily limited to a metal material as long as it is a material that is less likely to be elastically deformed than the anticorrosion member, and may be made of, for example, a synthetic resin material.

  As shown in FIG. 3A and FIG. 3B, the anticorrosion member 9 includes an end surface covering portion 9 a that contacts the tube end surface 4 c of the insertion portion 4, and a peripheral surface that contacts the outer peripheral surface 4 a of the insertion portion 4. The outer peripheral part 9b as a coating | coated part and the inner peripheral part 9c as a peripheral surface coating | coated part contact | abutted to the inner peripheral surface 4b of the insertion part 4 are comprised. Further, the front end portions of the outer peripheral portion 9b and the inner peripheral portion 9c are connected substantially perpendicularly from the end surface covering portion 9a, and the anticorrosion member 9 is formed in a substantially U shape in a sectional view.

  Further, the inner side of the substantially U-shaped cross-sectional view is formed in the covering space 11, and the tube end surface 4 c of the insertion portion 4 and the tube end surface are installed by attaching the tip of the insertion portion 4 in this space. The inner peripheral surface 4b and the outer peripheral surface 4a continuous to 4c are covered by the end surface covering portion 9a, the outer peripheral portion 9b, and the inner peripheral portion 9c of the anticorrosion member 9. In order to prevent the pipe end surface 4c of the insertion portion 4 from being water-tightly protected, the covering space 11 has a length between the outer peripheral portion 9b and the inner peripheral portion 9c between the outer peripheral surface 4a and the inner peripheral surface 4b of the fluid pipe 1. It is formed at substantially the same interval as the thickness of the fluid pipe 1 as the interval. In addition, the connection part of the outer peripheral part 9b and the end surface coating | coated part 9a becomes convex shape outward, and the thick part 9d thicker than the other part of the anticorrosion member 9 is formed.

  Moreover, the outer peripheral part 9b of this anti-corrosion member 9 is formed in a slightly thin film shape rather than the inner peripheral part 9c and the end surface coating | coated part 9a. A plurality of ridges 9e formed along the circumference of the outer peripheral surface are formed on the outer peripheral surface of the outer peripheral portion 9b in the axial direction, and the outer peripheral portion 9b is thinner than the inner peripheral portion 9c and the end surface covering portion 9a. Reinforce the strength of. Furthermore, the outer peripheral surface 4a of the insertion portion 4 is provided on the surface of the outer peripheral portion 9b on the side of the covering space 11 so that the anticorrosion member 9 is not detached from the insertion portion 4 when the anticorrosion member 9 is attached to the insertion portion 4. A plurality of protrusions 9f for causing friction between the anticorrosion members 9 are provided so as to protrude toward the tube axis C along the circumferential direction.

  Next, the holding part 10 will be described. As shown in FIG. 2A, the holding part 10 is formed in a substantially C shape in the tube axis direction view, in which a notch 10a is formed in a part of the ring shape in the tube axis direction view. With this shape, the holding part 10 can be reduced in diameter by bringing both ends of the holding part 10 closer to each other, or the holding part 10 can be increased in diameter by separating both ends from each other.

  Further, as shown in FIGS. 3A and 3B, the holding part 10 holds a part of the end face covering part 9 a of the anticorrosion member 9 so as to face the pipe end face 4 c of the insertion part 4. A clamping portion 10b having a clamping surface 10c is provided. From this clamping part 10b, the press part 10d provided with the press surface 10e as an opposing peripheral surface which comprises the substantially right angle and opposes the internal peripheral surface 4b of the insertion part 4 is extended.

  The pressing portion 10d extends so that the pressing surface 10e faces the inner peripheral surface 4b of the insertion portion 4 when the anticorrosion means 6 is attached to the insertion portion 4 to be described later. The holding part 10 is formed in an L shape in cross section by the sandwiching part 10b. The pressing portion 10 d is formed longer in the tube axis direction than the inner peripheral portion 9 c of the anticorrosion member 9, and the outer diameter of the pressing portion 10 d is substantially the same as the inner diameter of the insertion portion 4. .

  Further, a tapered surface 10f that is inclined from the outer peripheral surface side of the distal end toward the tube axis C side is formed on the inner peripheral surface of the distal end portion of the pressing portion 10d. By doing so, even when the insertion port 4 is inserted into the receiving port 3 and a fluid such as water circulates in the fluid pipe 1, the holding portion 10 is inserted into the insertion port 4 and the taper surface 10 f. The force received from the fluid in the direction away from the anticorrosion member 9 can be suppressed. Further, the outer diameter formed by the pressing portion 10 d of the holding portion 10 is slightly larger than the inner diameter of the anticorrosion member 9 in the natural state of the holding portion 10.

  Next, the insertion of the holding portion 10 into the anticorrosion member 9 will be described.

  First, as shown to Fig.2 (a), a user shrinks the holding | maintenance part 10 to radial direction. In the contracted state, the tip of the pressing portion 10d is inserted into the anticorrosion member 9 from the tube axis direction of the holding portion 10. And if the end surface coating | coated part 9a of the anticorrosion member 9 contact | abuts to the clamping surface 10c of the holding | maintenance part 10, the shrinkage | contraction of the radial direction of the holding | maintenance part 10 will be cancelled | released. By releasing the contraction in the radial direction, an elastic restoring force is generated in the holding portion 10 so as to return to the natural shape, and as a result, the pressing surface 10e of the pressing portion 10d outwards the inner peripheral portion 9c of the anticorrosion member 9. Press toward.

  The anticorrosion member 9 is made of a rubber body made of a material that is more easily elastically deformed than the holding portion 10, and in its natural state, it is difficult to maintain a circular shape in front view or a substantially U shape in cross section. Is pressed, elastically deforms from the natural state following the holding portion 10, and has a predetermined shape, that is, a circular shape in which the inner peripheral portion 9 c of the anticorrosion member 9 is stretched by the elasticity of the holding portion 10 in the circumferential direction. Thus, the anticorrosion member 9 is formed in a shape that allows the anticorrosion member 9 to be attached to the pipe end surface 4c in the circumferential direction (see FIG. 3A). As shown in FIGS. 2A and 2B, the anticorrosion means 6 is formed in a substantially cylindrical shape by inserting the holding portion 10 into the anticorrosion member 9. In addition, the inner peripheral part 9c of the anticorrosion member 9 is maintaining the state which the press surface 10e of the holding | maintenance part 10 contact | abutted over the circumferential direction. Furthermore, the anticorrosion member 9 follows the holding part 10 and elastically deforms from the natural state, so that the axes of the anticorrosion member 9 and the holding part 10 are reliably aligned. In addition, you may interpose connection means, such as apply | coating an adhesive agent, to the contact surface of the anticorrosion member 9 and the holding | maintenance part 10. FIG.

  Next, mounting of the anticorrosion means 6 configured by inserting the holding portion 10 on the anticorrosion member 9 to the insertion portion 4 of the fluid pipe 1 will be described.

  First, as shown in FIG. 4A, when the holding portion 10 is mounted on the insertion portion 4, the outer periphery on the opposite side of the inner peripheral surface 4 b of the insertion portion 4 to which the pressing surface 10 e of the holding portion 10 faces. The entire outer peripheral portion 9b of the anticorrosion member 9 formed in a thin film shape that comes into contact with the surface 4a is slid outwardly from the insertion portion 4 with respect to the end surface covering portion 9a (in the direction of the arrow in the drawing). Then, in a state where the pressing portion 10d is oscillated, the pressing portion 10d is inserted into the insertion portion 4 of the fluid pipe 1 from the pipe axis direction while the diameter of the holding portion 10 is reduced.

  The anticorrosion member 9 is pressed in the diameter-expanding direction by the holding portion 10 inserted into the anticorrosion member 9, and the outer peripheral portion 9b is in an original state with respect to the outer peripheral portion 9b that is slid by the pressing by the holding portion 10. The return force trying to return to is suppressed. For this reason, when the anticorrosion means 6 is attached to the insertion portion 4, the anticorrosion means 6 can be attached to the insertion portion 4 while the outer peripheral portion 9 b is swung.

  And as shown in FIG.4 (b), the press part 10d of the holding | maintenance part 10 is inserted in the insertion part 4 with the outer peripheral part 9b being swung. At this time, the holding portion 10 is contracted in the radial direction, and the pressing portion 10d is inserted into the insertion portion 4 until the end surface covering portion 9a of the anticorrosion member 9 contacts the tube end surface 4c. At this time, the holding surface 10c of the holding portion 10 is positioned so as to face the tube end surface 4c of the insertion portion 4 across the end surface covering portion 9a of the anticorrosion member 9, thereby positioning the holding portion 10 with respect to the insertion portion 4. it can.

  When the end surface covering portion 9a comes into contact with the tube end surface 4c, the insertion of the pressing portion 10d into the insertion portion 4 is stopped, and the reduced diameter state of the holding portion 10 is released. In the holding part 10 whose diameter has been released, an elastic restoring force in the radial direction in which the pressing surface 10 e faces the inner peripheral surface 4 b of the insertion portion 4 acts. By this elastic restoring force, the pressing surface 10e presses the inner peripheral portion 9c of the anticorrosion member 9 toward the inner peripheral surface 4b of the insertion portion 4, so that the pressing surface 10e is spaced between the inner peripheral portion 9c and the inner peripheral portion 9c. A frictional force is generated between the inner peripheral surface 4 b and the holding portion 10 is attached to the insertion portion 4.

  Further, as shown in FIG. 4C, the outer peripheral portion 9b is moved so that the anticorrosion member 9 is in an original state in which the anticorrosive member 9 has a U-shape in cross section from the state where the outer peripheral portion 9b is swung as described above. Move back (in the direction of the arrow in the figure). Since the outer peripheral portion 9b that has been swung back abuts on the outer peripheral surface 4a of the insertion portion 4, the insertion portion 4 of the fluid pipe 1 is brought into contact with the outer peripheral surface 4a by the contact of the outer peripheral portion 9b with the outer peripheral surface 4a. It will be in the covering state coat | covered by, and mounting | wearing of the anticorrosion means 6 is completed. At this time, air is mixed between the outer peripheral portion 9b and the outer peripheral surface 4a by swinging the outer peripheral portion 9b so as to contact the outer peripheral surface 4a sequentially from the end surface covering portion 9a side toward the tip. Can be prevented.

  At this time, as shown in FIG. 5, the end surface covering portion 9 a is sandwiched between the tube end surface of the insertion portion 4 and the clamping surface 10 c of the holding portion 10, and the holding portion 10 uses an elastic return force. And it is attached to the insertion portion 4. For this reason, the holding surface 10c holds the end surface covering portion 9a of the anticorrosion member 9 by pressing and holding the end surface covering portion 9a of the anticorrosion member 9 toward the tube end surface 4c of the insertion portion 4. The covering state covering the pipe end surface 4c of the mouth part 4 is maintained. Even if the diameter or tube thickness of the insertion portion for attaching the anticorrosion means 6 has a dimension slightly different from the predetermined dimension due to tolerances, etc., the elasticity of the anticorrosion member 9 and the holding part 10 constituting the anticorrosion means 6 is utilized. It can be attached to the insertion portion corresponding to the insertion portion having a size slightly different from the predetermined size.

  As described above, the anti-corrosion means 6 is attached and the fluid pipe 1 covered with the pipe end face is connected to the receiving port 3 of the other fluid pipe 1 'from the pipe axis direction. As shown in FIG. 6, the connection procedure is performed by first fitting the fitting portion 5 a of the seal member 5 into the concave portion 3 b formed in the receiving portion 3.

  Then, the fluid pipe 1 is inserted into the receiving part 3 of the other fluid pipe 1 'for a predetermined length while the valve part 5b of the seal member 5 is brought into contact with the outer peripheral surface 4a. At this time, the valve portion 5 b of the seal member 5 is deformed between the inner peripheral surface of the receiving port portion 3 and the outer peripheral surface 4 a of the insertion port 4 inserted into the receiving port portion 3, whereby one fluid pipe 1 and the other The fluid pipe 1 ′ is connected in a watertight state. At this time, the clamping part 10b of the holding part 10 may be brought into contact with the back end face 3d in the receiving part 3 in order to make the attachment of the anticorrosion means 6 of the insertion part 4 stronger.

  Next, when a predetermined amount of the insertion portion 4 is inserted into the receiving portion 3, while keeping the insertion portion 4 inserted into the receiving portion 3, the pushing bolt 7b is screwed from the outside of the arc groove 7c to fix it. 8 is pressed against the outer peripheral surface 4 a of the insertion portion 4, the push-in bolt 7 b is further screwed in, and the sharp blade 8 a of the fixed pawl 8 is pressed toward the tube axis C to bite into the outer peripheral surface 4 a of the insertion portion 4. The receiving part 3 and the insertion part 4 are connected. Thereby, it will be in the control state in which removal of the insertion part 4 from the receiving part 3 was controlled, and the assembly of the pipe joint 2 will be completed.

  As described above, in the pipe joint 2 of the present embodiment, the holding surface 10c of the holding unit 10 faces the pipe end surface 4c of the insertion portion 4 with the end surface covering portion 9a of the anticorrosion member 9 interposed therebetween. The holding portion 10 can be positioned with respect to the insertion portion 4, and the pressing surface 10e of the holding portion 10 utilizes the elastic return force in the radial direction toward the inner peripheral surface 4b or the outer peripheral surface 4a of the insertion portion 4. With the holding portion 10 made of a material that is less elastically deformed than the anticorrosion member 9, the anticorrosion member 9 can be easily and reliably held in its covering state without losing its shape.

  Further, in this embodiment, the pressing surface 10 e of the holding portion 10 extends so as to face only the inner peripheral surface 4 b of the insertion portion 4, and the outer diameter of the insertion portion 4 after the holding portion 10 is mounted. However, since it can maintain as before mounting | wearing with the holding | maintenance part 10, the insertion part 4 to which the holding | maintenance part 10 was mounted | worn is easy to connect with the receiving part 3. FIG.

  Further, in this embodiment, the outer peripheral portion 9b and the inner peripheral portion 9c of the anticorrosion member 9 can cover the inner peripheral surface 4b and the outer peripheral surface 4a continuous to the tube end surface 4c of the insertion portion 4, so The tube end surface 4c can be covered over substantially the entire area up to the inner peripheral surface 4b side and the outer peripheral surface 4a side.

  Further, in this embodiment, the pressing surface 10e of the holding portion 10 presses the inner peripheral portion 9c of the anticorrosion member 9 toward the inner peripheral surface 4b of the insertion portion 4 by the elastic restoring force in the radial direction. Since the peripheral portion 9c can be brought into close contact with the inner peripheral surface 4b of the insertion portion 4, the end surface covering portion 9a continuous to the inner peripheral portion 9c can be reliably prevented from entering the fluid, and the tube end surface 4c of the insertion portion 4 can be surely provided. Can be anticorrosive.

  In the present embodiment, the outer peripheral portion 9b of the anticorrosion member 9 formed in a thin film shape is slid outwardly from the insertion portion 4 with respect to the end surface covering portion 9a, and the insertion portion 4 is inserted by the end surface covering portion 9a. The tube end surface 4c is covered and the covering state is held by the holding portion 10, and thereafter, the outer peripheral surface 4a can be covered by the outer peripheral portion 9b in a predetermined manner. The anticorrosion member 9 formed in a thin film shape capable of maintaining the diameter can be easily attached to the insertion portion 4.

  Further, in this embodiment, both ends of the holding part 10 formed in a substantially C shape can be brought close to each other to be reduced in diameter, or separated from each other to be enlarged, and the holding part 10 in this reduced or enlarged state. And by attaching the anticorrosion member 9 to the insertion portion, the anticorrosion member 9 is uniformly pressed along the circumferential direction by the elastic return force of the holding portion 10, so that the axis between the anticorrosion member 9 and the insertion portion 4 is aligned. The anticorrosion member 9 can be attached to the insertion portion 4 with certainty.

  Next, the pipe joint according to the second embodiment will be described with reference to FIG. In addition, the same structure as the said embodiment and the overlapping structure are abbreviate | omitted.

  FIG. 7 is a partially enlarged view showing the anticorrosion means in the second embodiment.

  As shown in FIG. 7, the anticorrosion means 12 in Example 2 includes an anticorrosion member 13 that is formed in a substantially L-shaped cross-sectional view including an end face covering portion 13a and an outer peripheral portion 13b as a peripheral surface covering portion. 1, the holding unit 10 having the same configuration as 1 is inserted into the anticorrosion member 13.

  When the anticorrosion means 12 is attached to the insertion portion 4, first, the holding portion 10 is reduced in diameter in a state where the outer peripheral portion 13b is slid outwardly from the insertion portion 4 with respect to the end surface covering portion 13a. Is attached to the insertion port 4. Therefore, the insertion portion 4 of the fluid pipe 1 is covered with the outer peripheral portion 13 b and the pipe end surface 4 c by the anticorrosion member 13, and the end surface covering portion 13 a of the anticorrosion member 13 covering the pipe end surface 4 c is formed by the holding surface 10 c of the holding portion 10. The covering state covering the tube end surface 4c is maintained. Further, the inner peripheral surface 4b is directly pressed in the diameter increasing direction by a pressing surface 10e provided in the pressing portion 10d of the holding portion 10. That is, in Example 2, corrosion prevention of the insertion part 4 is performed by covering only the pipe end surface 4c in a watertight manner.

  Next, a pipe joint according to Example 3 will be described with reference to FIG. In addition, the same structure as the said Example is abbreviate | omitted.

  FIG. 8 is a partially enlarged view showing the anticorrosion means in the third embodiment.

  As shown in FIG. 8, the anticorrosion means 14 in the third embodiment is sandwiched between the anticorrosion member 15 formed in an L-shape in a sectional view including an end surface covering portion 15 a and an inner peripheral portion 15 b as a peripheral surface covering portion. And a holding portion 16 formed in an L-shape in cross-sectional view including a pressing portion 16b provided with a pressing surface 16c extending substantially perpendicularly from an end portion in the diameter increasing direction of the holding portion 16a. ing.

  When the anticorrosion means 14 is attached to the insertion portion 4, first, the inner peripheral portion 15 b of the anticorrosion member 15 is inserted until the end surface covering portion 15 a covers the tube end surface 4 c of the insertion portion 4. Then, the inner peripheral portion 15 b is brought into contact with the inner peripheral surface 4 b of the insertion portion 4, and the holding portion 16 whose diameter is expanded from the tube axis direction is attached to the insertion portion 4. When the holding portion 16 a comes into contact with the end surface covering portion 15 a of the anticorrosion member 15, the holding portion 16 is released from the expanded diameter, and the pressing surface 16 c of the pressing portion 16 b is used as an outer periphery of the insertion portion 4 by utilizing an elastic restoring force. The surface 4a is pressed in the direction of diameter reduction.

  Therefore, the insertion opening 4 of the fluid pipe 1 is covered with the inner peripheral surface 4b and the pipe end face 4c by the anticorrosion member 15, and the end face covering part 15a of the anticorrosion member 15 covering the pipe end face 4c is the holding part 16a of the holding part 16. Thus, the covering state covering the tube end surface 4c is maintained. Moreover, since the outer peripheral part 4a is pressed by the pressing part 10d of the holding | maintenance part 16 in the diameter reduction direction, in Example 3, corrosion prevention of the insertion part 4 is performed by covering only the pipe end surface 4c watertightly. ing.

  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 embodiment, the anticorrosion means 6 includes the anticorrosion member 9 formed in a substantially U shape in cross section and the holding portion 10 formed in a substantially L shape in cross section. May be formed in a substantially U shape in cross section so that the anticorrosion member 9 can be held from both the outer peripheral surface 4a and the inner peripheral surface 4b of the insertion portion 4.

  In the first, second, and third embodiments, when the anticorrosion means 6 is attached to the insertion portion 4 of the fluid pipe 1, the anticorrosion member 9 is in direct contact with the pipe end face 4c, the outer peripheral face 4a, and the inner peripheral face 4b. However, the attachment of the anticorrosion means to the insertion portion 4 may be made stronger by applying an adhesive to the insertion portion 4 or the anticorrosion member 9.

It is sectional drawing which shows the pipe joint in Example 1 of this invention. (A) is a front view of an anticorrosion means, (b) is a side view which shows an anticorrosion means. (A) is AA sectional drawing which shows the anticorrosion means in Fig.2 (a), (b) is a figure which shows the partial expanded sectional view which shows the anticorrosion means in Fig.3 (a). (A) is sectional drawing which shows the state by which anticorrosion means is mounted | worn by an insertion part, (b) is sectional drawing which shows the state by which anticorrosion means rolls up an outer part to an insertion part, and is mounted | worn (C) is a figure which shows sectional drawing which shows the state by which the anticorrosion means was mounted | worn with the insertion part. It is the elements on larger scale which show the anticorrosion means in FIG.4 (c). It is an assembly sectional view showing a pipe joint. It is the elements on larger scale which show the anticorrosion means in Example 2. FIG. It is the elements on larger scale which show the anticorrosion means in Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluid pipe 2 Pipe joint 3 Receptacle part 3a Inner peripheral surface 4 Insert part 4a Outer peripheral surface 4b Inner peripheral surface 4c Pipe end surface (end surface)
6 Anticorrosion means 9 Anticorrosion member 9a End surface covering portion 9b Outer peripheral portion (peripheral surface covering portion)
9c Inner peripheral part (surrounding surface covering part)
10 holding part 10b clamping part 10c clamping surface (holding surface)
10d Pressing part 10e Pressing surface (opposing peripheral surface)
12 Corrosion prevention means 13 Corrosion prevention member 13a End surface covering part 13b Outer peripheral part (peripheral surface covering part)
14 anticorrosion means 15 anticorrosion member 15a end surface covering portion 15b inner peripheral portion (peripheral surface covering portion)
16 Holding part 16a Clamping part 16b Pressing part 16c Pressing surface (opposing peripheral surface)

Claims (6)

An insertion portion constituting one fluid pipe,
An anticorrosion member comprising an elastic material formed in an annular shape and having an end surface covering portion that covers the end surface of the insertion portion,
A receiving portion constituting the other fluid pipe into which the insertion portion whose end surface is covered by the anticorrosion member is inserted, and
A pipe joint for connecting the one fluid pipe and the other fluid pipe in a watertight state,
A holding surface that is made of a material that is less elastically deformed than the anticorrosion member and faces at least a part of the end surface of the insertion portion across the end surface covering portion of the anticorrosion member, and the insertion port continuous to the holding surface A holding portion having an inner peripheral surface or an opposing peripheral surface facing the outer peripheral surface of the portion, is provided along the circumferential direction of the anticorrosion member,
The holding portion is attached to the insertion portion using a radial elastic return force in which the opposing peripheral surface faces the inner peripheral surface or the outer peripheral surface of the insertion portion. An end face covering portion maintains a covering state covering the end face of the insertion portion.   2. The pipe joint according to claim 1, wherein an opposing peripheral surface of the holding portion extends to face only an inner peripheral surface of the insertion portion.   3. The pipe joint according to claim 1, wherein the anticorrosion member has a peripheral surface covering portion that covers an inner peripheral surface or an outer peripheral surface of the insertion portion continuously from the end surface covering portion.   The pipe according to claim 3, wherein the opposing peripheral surface of the holding portion is pressed toward the inner peripheral surface or the outer peripheral surface of the insertion portion with the peripheral surface covering portion of the anticorrosion member interposed therebetween. Fittings.   The peripheral surface covering portion of the anticorrosion member covering the inner peripheral surface of the insertion portion facing the opposing peripheral surface of the holding portion or the peripheral surface opposite to the outer peripheral surface is formed in a thin film shape. The pipe joint according to claim 3 or 4, wherein the pipe joint is provided.   The pipe joint according to any one of claims 1 to 5, wherein a shape of the holding portion in a tube axis direction is formed in a substantially C shape.

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