JP5723164B2 - Rust prevention member - Google Patents

Description

  The present invention relates to an insertion port formed at the distal end portion of one fluid pipe in the tube axis direction, and a receiving port formed at the distal end portion of the other fluid pipe in the tube axial direction. In the pipe joint composed of a portion, it is composed of an elastic member that presses the tube end surface of the insertion portion to prevent rust by being inserted into the insertion portion, and a holding portion that holds the elastic member with the tube end surface. The present invention relates to an annular rust prevention member.

  Conventionally, a ring main body (rust preventive member) that can be externally fitted to an end (insertion portion) of a pipe body (fluid pipe), and an inward protruding piece (holding piece) formed in the inner diameter direction from the inner peripheral edge of one end of the ring main body Part), and a corrosion prevention ring (rust prevention member) provided with. Such an anticorrosion ring is formed by disposing a rubber adhesive (elastic member) on the surface of the inwardly protruding piece on the side facing the tip surface (tube end surface) of the tube, and fitting the anticorrosion ring to the tube. A rubber-based adhesive is adhered to the distal end surface of the tubular body to prevent rusting of the distal end surface of the tubular body, and the ring body is engaged with the end of the tubular body by the adhesive force of the rubber-based adhesive (for example, Patent Document 1).

Japanese Utility Model Publication No. 7-22198 (page 5, Fig. 1)

  However, in the rust-preventing member described in Patent Document 1, the anticorrosion ring (rust-preventing member) is externally fitted to the end portion (insertion portion) of the pipe body (fluid pipe) and the front end surface (pipe) of the pipe body When the end of the tube is inserted into the receiving portion formed at the end of the other tube after the rubber adhesive (elastic member) is bonded to the end surface and the tip surface is rust-prevented, this tube In the process of inserting the end of the body into the receptacle formed at the end of the other tube, the tip of the tube and the rubber are removed by the drying of the rubber adhesive and the restoring force of the rubber adhesive. There is a problem that the rust prevention of the tip end surface may not be maintained because the adhesive is partially separated from the adhesive.

  The present invention has been made paying attention to such problems, and when inserting the insertion portion into the receiving portion, rust prevention of the tube end surface of the insertion portion in a state of being inserted into the insertion portion. An object of the present invention is to provide a rust preventive member capable of maintaining the above.

In order to solve the above problems, the rust preventive member of the present invention is
An insertion port formed at the distal end portion of one fluid pipe in the tube axis direction, and a receiving portion formed at the distal end portion of the other fluid pipe in the tube axis direction, the insertion portion being watertightly inserted. In a pipe joint, it is constituted by an elastic member that presses the pipe end surface of the insertion portion to prevent rust by being inserted into the insertion portion, and a holding portion that holds the elastic member with the tube end surface An annular rust preventive member,
The holding portion extends in an insertion direction into the insertion portion, and extends from the inner peripheral surface of the receiving port to the extension portion that engages with the outer peripheral surface of the insertion portion. A sliding contact portion that is formed in a large diameter and is formed so as to be elastically deformable that gradually expands in the insertion direction, and a holding piece portion that extends from the extending portion toward the inner diameter side. When the insertion portion is configured to be inserted into the receiving portion, the sliding contact portion and an inner peripheral surface of the receiving portion are in sliding contact with each other so that the holding portion and the insertion portion are connected to the insertion portion. The elastic member is clamped between the tube end surface and the holding piece by relative movement in the tube axis direction.
According to this feature, when the insertion portion is inserted into the receiving portion, the elastic portion is formed with a larger diameter than the inner peripheral surface of the receiving portion in the extending portion of the holding portion and gradually expands in the insertion direction. By moving the insertion portion and the holding portion relative to each other in the tube axis direction of the insertion portion by the frictional force generated between the sliding contact portion formed in a deformable manner and the inner peripheral surface of the reception portion, the holding piece portion and Since the elastic member can be pressed against the tube end surface between the tube end surface and the elastic member can be brought into close contact with the tube end surface to prevent rust, the tube end surface and the elastic member are inserted when the insertion portion is inserted into the receiving portion. Rust prevention can be maintained without separating them.

The rust preventive member of the present invention is
The outer end of the elastic member bulges toward the insertion direction of the rust preventive member into the insertion portion, and is sandwiched between the outer peripheral surface of the insertion portion and the extending portion. The bulging part is provided.
According to this feature, even if the fluid flowing in the fluid pipe flows between the insertion portion and the receiving portion, the elastic member is brought into close contact with the outer peripheral surface of the insertion portion in the vicinity of the tube end surface. Since the intrusion of fluid from the outer peripheral surface of the insertion port toward the tube end surface can be prevented, rust can be prevented over the tube end surface of the insertion port and the outer peripheral surface of the insertion port near the tube end surface. .

The rust preventive member of the present invention is
The holding portion is characterized in that a core material is provided at a bent portion formed by the extending portion and the holding piece portion.
According to this feature, since the strength of the holding portion can be improved by the core material, the deformation of the holding portion due to the frictional force generated between the holding piece portion and the inner peripheral surface of the receiving portion is suppressed, and the rust is stably prevented. The insertion of the member into the insertion port can be maintained.

The rust preventive member of the present invention is
A gap that allows the elastic member that is elastically deformed to extend in the outer diameter direction is formed between the holding portion and the insertion portion.
According to this feature, a part of the elastic member that is elastically deformed is accommodated in the gap, and the elastic member is restored between the tube end surface and the holding portion and acts in the direction away from the tube end surface from the elastic member to the rust prevention member. Force can be kept small.

It is an exploded sectional view of a pipe joint showing a mouthpiece part and a mouthpiece part in an example. (A) is a front view which shows a rustproof cover, (b) is AA sectional drawing of the rustproof cover in Fig.2 (a). It is sectional drawing which shows the attachment to the insertion part of a rust prevention cover. It is sectional drawing which shows the insertion to the receiving part of the insertion part by which the antirust cover was inserted. It is sectional drawing which shows the sliding contact of the sliding contact part and the internal peripheral surface of a receiving part. It is sectional drawing which shows the state which completed the insertion to the opening part of an insertion part. It is sectional drawing of the antirust cover as a 1st modification of a present Example. It is sectional drawing which shows the attachment to the insertion part of the antirust cover as a 2nd modification of a present Example.

  EMBODIMENT OF THE INVENTION The form for implementing the antirust member which concerns on this invention is demonstrated below based on an Example.

  The pipe joint according to the embodiment will be described with reference to FIGS. Hereinafter, in this embodiment, the left side of FIG. 1 and the front side of FIG. 2A will be described as the front side (front side) of the anticorrosion cover. The code | symbol 1 of FIG. 1 is a pipe joint to which the rust prevention cover was applied as a rust prevention member in this invention.

  As shown in FIG. 1, the pipe joint 1 in this embodiment includes a fluid pipe 2 in which a receiving part 2 a is formed at the tip part in the tube axis C direction, and a receiving part 2 a in the tip part in the tube axis C direction. A fluid tube 3 in which an insertion port 3a is inserted, a seal member 4 which has elasticity and prevents fluid from leaking between the receiving port 2a and the insertion port 3a, and a fluid tube 3 Is cut substantially perpendicularly to the tube axis C, so that the pipe end surface 3b as a cut surface formed by exposing the metal base of the fluid tube 3 itself to the insertion portion 3a is rust-prevented in the present invention. It is comprised from the antirust cover 5 as a rust member. These fluid pipes 2 and 3 are, for example, water pipes for flowing clean water as a fluid therein.

  In this embodiment, these fluid pipes 2 and 3 are ductile cast iron pipes manufactured by pouring ductile cast iron into a mold and then cooling. Although not shown in the drawings, the inner surface of a ductile cast iron pipe mold has innumerable irregularities stamped over substantially the entire surface so that the fluid pipes 2 and 3 can be easily detached from the mold after the casting of the fluid pipes 2 and 3. Yes.

  For this reason, as shown in FIG. 3, the fluid pipes 2, 3 are made of ductile cast iron that is poured into the concavo-convex part of the mold in the casting process, so that the ductile cast iron is cooled and removed from the mold. An engaged portion 3e having a plurality of concave portions 3g is formed over substantially the entire circumference of the outer peripheral surfaces 3c of the second and third (the outer peripheral surface of the fluid pipe 2 is not shown).

  The fluid pipes 2 and 3 of this embodiment are cast by a gravity casting method, a die casting method, a centrifugal casting method, or the like. In particular, when the fluid pipes 2 and 3 are cast by the centrifugal casting method, a frictional force is applied to the liquid ductile cast iron that performs centrifugal motion in the mold by the innumerable recesses formed on the inner surface of the mold. It is possible to cast the fluid pipes 2 and 3 with less deviation.

  Furthermore, the fluid pipes 2 and 3 are configured such that a rust preventive paint (not shown) is applied over substantially the entire circumference of the outer peripheral surface 3c after casting, and this rust preventive paint is applied to the recessed portion of the engaged portion 3e. By accumulating, the rust prevention effect of the outer peripheral surface 3c of the fluid pipes 2 and 3 is increased.

  The front end of the receiving portion 2a is formed on the inner peripheral surface 2b whose inner diameter is larger than the outer diameter of the insertion portion 3a. Grooves 2c that open toward the tube axis C at predetermined intervals in the circumferential direction are formed in the receiving end 2a at the distal end of the receiving end 2a. In these grooves 2c, a fixed claw 6 made of a metal material or the like and having a sharp blade 6a at the end facing the tube axis C side is disposed.

  Further, a plurality of bolt holes 2d are formed at predetermined intervals in the circumferential direction at the tip of the receiving portion 2a. These bolt holes 2d communicate with different groove portions 2c, and bolts 7 are screwed thereon. For this reason, the fixed claw 6 is pressed toward the tube axis C by screwing in the bolt 7. An annular fitting groove 2e for fitting a fitting portion 4a (described later) of the seal member 4 closer to the insertion direction of the insertion portion 3a than the groove portion 2c on the inner peripheral surface 2b of the receiving portion 2a. Is formed.

  On the back side of the fitting groove 2e on the inner peripheral surface 2b of the receiving portion 2a, it is substantially perpendicular to the tube axis C so as to be connected to the inner peripheral surface 2g having a smaller diameter than the tip of the receiving portion 2a. An annular back end face 2h is formed.

  As shown in FIG. 1, a lining layer 3 f is formed on the inner peripheral surface 3 d of the fluid pipe 3 by mortar as a rust prevention treatment for preventing rust from the fluid flowing in the fluid pipes 2 and 3. . In this embodiment, the lining layer 3f is made of mortar having a sufficient thickness for rust prevention. However, if the inner peripheral surface 3d of the fluid pipe 3 can be rust-prevented, the lining layer 3f is made thinner. You may form, for example, you may comprise with a thin coating layer by the powder coating material which consists of a rust preventive material.

  As shown in FIGS. 1 and 4, the seal member 4 includes a fitting portion 4 a fitted into the fitting groove 2 e. Further, the fitting portion 4a has a valve portion for watertightly sealing a gap between the inner peripheral surface 2b of the receiving portion 2a and the outer peripheral surface 3c of the insertion portion 3a inserted into the receiving portion 2a. 4b bulges out.

  As shown in FIG. 1, FIG. 2 (a) and FIG. 2 (b), the rust preventive cover 5 is an elastic member in the present invention for rusting the tube end surface 3b of the insertion portion 3a over the entire circumference. The ring-shaped antirust rubber 5a and the guide ring 5b as a holding portion in the present invention for holding the antirust rubber 5a between the insertion portion 3a when the pipe end surface 3b is rusted. Has been. The guide ring 5b is made of a soft resin material having an annular elasticity in a front view, and the rust preventive rubber 5a is a low rebound elastic material, that is, a material having a relatively low rebound elastic modulus, and has an adhesive force. It is comprised by the butyl rubber which has.

  Further, as shown in FIG. 2 (b), the guide ring 5b faces in the front-rear direction of the rust preventive cover 5 and is formed in an annular shape over the entire circumference of the guide ring 5b. It is comprised from the piece part 5c and the holding piece part 5d extended toward the internal-diameter side of the antirust cover 5 from the rear-end part of this outer peripheral piece part 5c. Therefore, between the rear end portion of the outer peripheral piece portion 5c and the outer diameter side end portion of the holding piece portion 5d in the rust-proof cover 5, the guide ring 5b extends over the entire circumference in a cross-sectional view shown in FIG. It is formed in a bent portion 5i formed so as to form a substantially L shape.

  Among these, the outer peripheral piece part 5c is formed in the taper shape gradually diameter-reduced toward the front side which is the insertion direction side mentioned later to the insertion opening part 3a of the antirust cover 5. As shown in FIG. For this reason, the guide ring 5b is formed so that the diameter of the rear end is slightly longer than the diameter of the receiving port 3a. Further, on the inner peripheral surface 5e of the outer peripheral piece 5c, a protrusion 5f as an engaging portion in the present invention is separated in the tube axis C direction over the entire circumference in the circumferential direction of the outer peripheral piece 5c. It is installed.

  Furthermore, a sliding contact portion 5j formed in a tapered shape that gradually increases in diameter toward the front side at predetermined intervals in the circumferential direction is formed at the front end portion of the outer peripheral piece portion 5c. As shown in FIG. 5, these sliding contact portions 5j have outer peripheral piece portions 5c so that they can slide into the inner peripheral surface 2b of the receiving portion 2a when the insertion portion 3a is inserted into the receiving portion 2a. It is formed to have a slightly larger diameter than the outer diameter at the rear end.

  As shown in FIGS. 2B and 3, the rust preventive rubber 5 a and the holding piece 5 d have substantially the same length in the radial direction of the guide ring 5 b, and the rust preventive rubber 5 a It is fixed to the front side of the piece 5d with an adhesive or the like. A bulging portion 5k bulges at the outer diameter side end portion of the rust preventive rubber 5a toward the front side which is the insertion direction side of the rust preventive cover 5 into the insertion port 3a. Yes. As shown in FIGS. 2 (a) and 2 (b), a notch 5g is formed at the inner diameter side end of the rust preventive rubber 5a over the entire circumference of the rust preventive rubber 5a. It is formed so as to open toward the front side.

  Similarly, a notch 5h is formed at the inner diameter side end portion of the guide ring 5b of the holding piece portion 5d so as to open toward the back side of the guide ring 5b over the entire circumference in the circumferential direction of the holding piece portion 5d. ing. These notches 5g and 5h are opposed to each other in the direction of the tube axis C. As will be described later, the user cuts the inner diameter side of the rust preventive rubber 5a and the holding piece 5d along the notches 5g and 5h. The radial direction dimensions of the rust rubber 5a and the holding piece 5d can be adjusted to be short. Note that the notches 5g or 5h are not necessarily formed over the entire circumference in the circumferential direction as in the present embodiment, and are formed in perforations at predetermined intervals along the circumferential direction, for example. It doesn't matter.

  Next, connection of the fluid pipes 2 and 3 using the pipe joint 1 configured as described above will be described. First, as shown in FIG.1 and FIG.3, the antirust cover 5 is arrange | positioned on the pipe axis C of the fluid pipe 3, and the front side of the antirust cover 5 is made to oppose the pipe end surface 3b of the insertion part 3a. Then, the outer peripheral piece 5c formed in a tapered shape that gradually decreases in diameter toward the front side of the rust preventive cover 5 is slid onto the outer peripheral surface 3c in a state where the distal end is expanded in diameter by pressing the outer peripheral piece 5c against the insertion opening 3a. The rust preventive rubber 5a is pressed toward the tube end surface 3b by the holding piece 5d by inserting the rust preventive cover 5 toward the tube end surface 3b of the insertion port 3a while being in contact therewith.

  By pressing the rust preventive rubber 5a against the pipe end surface 3b by the holding piece 5d, the protrusions 5f and 5f are engaged with the recess 3g by the restoring force in the diameter reducing direction of the outer peripheral piece 5c, and the rust preventive rubber. 5a is elastically deformed into a shape that is in close contact with the tube end surface 3b and is in close contact with the tube end surface 3b.

  At this time, the rust preventive rubber 5a is extended toward the inner diameter side and the outer diameter side of the rust preventive cover 5 along with the elastic deformation caused by being pinched by the holding piece 5d and the pipe end surface 3b. Further, as shown in FIG. 3, the bulging portion 5k includes an inner peripheral surface 5e of the outer peripheral piece 5c and an outer peripheral surface 3c in the vicinity of the pipe end surface 3b by inserting the rust preventive cover 5 into the insertion portion 3a. Sandwiched between. By sandwiching the bulging portion 5k by the inner peripheral surface 5e of the outer peripheral piece portion 5c and the outer peripheral surface 3c in the vicinity of the pipe end surface 3b, the bulging portion 5k is elastically deformed and the inner peripheral surface 5e of the outer peripheral piece portion 5c and the tube It can adhere to both the outer peripheral surface 3c in the vicinity of the end surface 3b, and the inner peripheral surface 5e of the outer peripheral piece 5c and the outer peripheral surface 3c in the vicinity of the pipe end surface 3b can be rust-prevented.

  The rust preventive rubber 5a is bonded to the pipe end surface 3b in the elastically deformed state by the adhesive force of the rust preventive rubber 5a itself made of butyl rubber, and has low rebound resilience possessed by the rust preventive rubber 5a itself made of butyl rubber. By the force to be elastically restored in the range of the above, the protrusions 5f, 5f protruding from the outer peripheral piece 5c are more strongly engaged with the recesses 3g formed in the engaged portion 3e.

  Due to the concavo-convex engagement between each of the protrusions 5f and 5f and the engaged portion 3e, the rust prevention cover 5 is pressed in the radial direction by the outer peripheral piece 5c disposed on the outer diameter side of the insertion opening 3a. Positioning is performed with respect to the mouth 3a. Furthermore, the rust preventive rubber 5a is elastically deformed between the holding piece portion 5d and the tube end surface 3b and held in close contact with the tube end surface 3b, and the attachment of the rust preventive cover 5 to the insertion portion 3a is completed.

  In the present embodiment, the thickness of the insertion portion 3a including the lining layer 3f is formed longer than the radial dimension of the rust preventive rubber 5a and the holding piece 5d. And the holding piece 5d is arranged on the outer diameter side of the inner diameter side end of the lining layer 3f while preventing the side made of ductile cast iron, which is the outer peripheral side of the pipe end surface 3b, from rusting. . For this reason, the end portions on the inner diameter side of the rust preventive rubber 5 a and the holding piece portion 5 d can suppress the drag received from the fluid flowing in the fluid pipes 2 and 3 to a small value.

  Furthermore, although not particularly shown, when the thickness of the insertion portion 3a including the lining layer 3f is longer than the radial dimension of the rust preventive rubber 5a and the holding piece portion 5d, the user However, by cutting out the inner diameter side of the rust preventive rubber 5a and the holding piece 5d along the cutouts 5g and 5h, the radial dimensions of the rust preventive rubber 5a and the holding piece 5d are adjusted to be short, and the rust preventive rubber It is possible to prevent the inner diameter side ends of 5a and the holding piece 5d from projecting to the inner diameter side of the insertion portion 3a with respect to the lining layer 3f.

  4 and 5, after the fitting portion 4a of the seal member 4 is fitted over the entire circumference of the fitting groove 2e, the insertion portion 3a to which the anticorrosion cover 5 is attached is moved to the back. The insertion portion 3a is inserted into the receiving portion 2a until it comes into contact with the end surface 2h, and the valve portion 4b is elastically deformed by the outer peripheral surface 3c of the insertion portion 3a and the inner peripheral surface 2b of the receiving portion 2a. And the receiving portion 2a are hermetically sealed.

  At this time, as shown in FIG. 5, the sliding contact portion 5j comes into contact with the inner peripheral surface 2b of the receiving port portion 2a between the back end surface 2h of the receiving port portion 2a and the valve 4b of the sealing member 4, thereby sliding. The insertion portion 3a and the guide ring 5b are relatively moved toward the tube axis C of the insertion portion 3a by a frictional force generated between the contact portion 5j and the inner peripheral surface 2b. By the relative movement between the insertion portion 3a and the guide ring 5b, the rust preventive rubber 5a between the holding piece portion 5d and the tube end surface 3b is more strongly pressed against the tube end surface 3b.

  Further, as shown in FIG. 6, while the sliding contact portion 5j is in contact with the inner peripheral surface 2b, the insertion portion 3a is inserted into the receiving portion 2a until the guide ring 5b contacts the rear end surface 2h. The rust preventive rubber 5a is further pressed against the pipe end face 3b by the holding piece 5d by bringing the guide ring 5b and the back end face 2h into contact with each other, and the rust preventive rubber 5a is securely adhered to the pipe end face 3b. .

  In the present embodiment, the insertion portion 3a is inserted into the receiving portion 2a until the guide ring 5b contacts the inner end surface 2h in the receiving portion 2a as described above. However, the rust preventive rubber 5a and the pipe end surface 3b are inserted. If the contact portion is sufficiently adhered, the insertion portion 3a may not be inserted into the receiving portion 2a until the guide ring 5b and the back end surface 2h are brought into contact with each other.

  Finally, by inserting the bolts 7, the sharp edges 6 a of the fixing claws 6 are bitten into the outer peripheral surface 3 c of the insertion portion 3 a to fix the insertion portion 3 a in the receiving portion 2 a. Complete the connection of tubes 2 and 3.

  In this embodiment, the guide ring 5b is oriented in the front-rear direction of the anticorrosion cover 5, and the outer peripheral piece 5c is formed in an annular shape over the entire circumference of the guide ring 5b, and the rear end of the outer peripheral piece 5c. And a holding piece 5d extending toward the inner diameter side of the rust-proof cover 5, and the guide ring 5b is substantially L-shaped in the cross-sectional view shown in FIG. Although formed as described above, as a first modification of the present embodiment, the bent portion 5i of the guide ring 5b is made of a hard resin material or a metal material having a stronger strength than the soft resin material constituting the guide ring 5b. The strength of the guide ring 5b may be improved by embedding the core material 5m having a substantially L shape in cross-section.

  By configuring the guide ring 5b in this way, when the insertion portion 3a is inserted into the receiving portion 2a, the sliding contact portion 5j provided on the outer peripheral piece 5c of the guide ring 5b and the receiving portion 2a It is possible to suppress the deformation of the guide ring 5b due to the frictional force generated by the sliding contact with the inner peripheral surface 2b.

  Further, in this embodiment, the rust-proof rubber 5a is elastically deformed between the holding piece 5d and the pipe end surface 3b by inserting the rust-proof cover 5 into the insertion portion 3a, and the rust-proof rubber 5a is piped. As shown in FIG. 8, the bent portion 5n formed by the outer peripheral piece portion 5c and the holding piece portion 5d in the guide ring 5b is provided as the anticorrosive cover 5 as shown in FIG. And a gap 5p is formed on the inner diameter side of the anticorrosive cover 5 of the bent portion 5n.

  By configuring the guide ring 5b in this way, when the rust-proof cover 5 is inserted into the insertion portion 3a, the rust-proof rubber 5a is elastically deformed between the holding piece portion 5d and the pipe end surface 3b. A part of the rust preventive rubber 5a is extended into the gap 5p, and the restoring force generated in the rust preventive rubber 5a between the tube end surface 3b and the holding piece 5d can be kept small.

  As described above, in the rust preventive cover 5 according to the present embodiment, the guide ring 5b extends in the insertion direction to the insertion portion 3a and is engaged with the outer peripheral surface 3c of the insertion portion 3a. Part 5c, and holding piece part 5d extended from the outer peripheral piece part 5c toward the inner diameter direction, and the outer peripheral piece part 5c and the inner peripheral surface 2b of the receiving part 2a are in sliding contact with each other to guide the ring. 5b and the insertion portion 3a are moved relative to each other in the direction of the tube axis C of the insertion portion 3a, so that the rust preventive rubber 5a is sandwiched between the tube end surface 3b and the holding piece portion 5d. The insertion portion 3a and the guide ring 5b are relatively moved in the direction of the tube axis C of the insertion portion 3a by the frictional force generated between the holding piece portion 5d and the inner peripheral surface 2b of the receiving portion 2a when inserted into the portion 2a. By pressing the rust preventive rubber 5a against the pipe end face 3b between the holding piece 5d and the pipe end face 3b, the rust preventive rubber 5a is Since it can be brought into close contact with the end surface 3b to prevent rust, the rust prevention can be maintained without separating the tube end surface 3b from the rust preventive rubber 5a when the insertion port 3a is inserted into the receiving port 2a. .

  Further, the end portion on the outer diameter side of the rust preventive rubber 5a bulges in the direction in which the rust preventive cover 5 is inserted into the insertion portion 3a, and the outer peripheral surface 3c and the outer peripheral piece portion 5c of the insertion portion 3a. Since the bulging portion 5k sandwiched between them is provided, the rust preventive rubber 5a bulges even if the fluid flowing in the fluid pipes 2 and 3 flows between the insertion portion 3a and the receiving portion 2a. Since the portion 5k is brought into close contact with the outer peripheral surface 3c of the insertion portion 3a in the vicinity of the tube end surface 3b, it is possible to prevent fluid from entering from the outer peripheral surface 3b of the insertion portion 3a toward the tube end surface 3b. Rust prevention can be achieved over the pipe end surface 3b of the mouth portion 3a and the outer peripheral surface 3c of the insertion portion 3a in the vicinity of the tube end surface 3b.

  Further, since the guide ring 5b includes the core material 5m at the bent portion 5i formed by the outer peripheral piece portion 5c and the holding piece portion 5d, the strength of the guide ring 5b can be improved by the core material 5m. The deformation of the guide ring 5b due to the frictional force generated between the piece portion 5d and the inner peripheral surface 2b of the receiving portion 2a can be suppressed, and the insertion of the anticorrosion cover 5 into the insertion portion 3a can be stably maintained.

  Further, since a gap 5p is formed between the outer peripheral piece 5c and the insertion portion 3a to allow the elastically deformed rustproof rubber 5a to extend in the outer diameter direction, the elastically deformed rustproof rubber. A part of 5a is accommodated in the gap 5p, and the rust preventive rubber 5a acting in the direction away from the pipe end face 3b from the rust preventive rubber 5a to the rust preventive cover 5 between the pipe end face 3b and the outer peripheral piece 5c is restored. Force can be kept small.

  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 above-described embodiment, the fluid pipes 2 and 3 are described as water pipes in which clean water flows, but the fluid flowing in the fluid pipes 2 and 3 is liquid other than water, such as petroleum, in addition to clean water. It may be a mixture of liquid and gas.

  Moreover, in the said Example, although the guide ring 5b was comprised with the soft resin material etc. which have cyclic | annular elasticity by front view, the pipe end surface by the rust prevention rubber 5a is made by engaging the protrusion 5f with the outer peripheral surface 3c. If it is possible to continue the rust prevention of 3b, the guide ring 5b may be a hard resin material or a metal material having corrosion resistance.

  Moreover, although the said pipe end surface 3b was demonstrated as a cut surface which cut | disconnected the fluid pipe | tube 3 in the said Example, the pipe end surface 3b may be an end surface of the fluid pipe | tube 3 in the cast state.

  Moreover, in the said Example, although the elastic member was comprised with the butyl rubber which has a comparatively low rebound resilience rate and has adhesive force, if an elastic member closely_contact | adheres to the pipe end surface 3b of the insertion part 3a and can prevent rust, May be a soft resin, an elastic body, an elastomer, or the like.

  In the embodiment, the guide ring 5b has a substantially L-shaped cross-sectional view in the bent portion 5i formed by the rear end portion of the outer peripheral piece portion 5c and the outer end portion of the holding piece portion 5d in the rust prevention cover 5. Although the strength of the guide ring 5b was improved by embedding the core material 5m, the core material was configured separately from the guide ring 5b, and the core material was, for example, the outer diameter side of the guide ring 5b, or You may improve the intensity | strength of the guide ring 5b by attaching to the bending part 5i from an internal diameter side.

1 Pipe Fitting 2 Fluid Pipe 2a Receiving Portion 3 Fluid Pipe 3a Inserting Portion 3b Pipe End Surface 3c Outer Peripheral Surface 5 Rust Prevention Cover (Rust Prevention Member)
5a Rust prevention rubber (elastic member)
5b Guide ring (holding part)
5c Outer peripheral piece (extension part)
5d Holding piece portion 5i Bending portion 5j Sliding contact portion 5k Swelling portion 5m Core material 5n Bending portion 5p Gap

Claims (4)

An insertion port formed at the distal end portion of one fluid pipe in the tube axis direction, and a receiving portion formed at the distal end portion of the other fluid pipe in the tube axis direction, the insertion portion being watertightly inserted. In a pipe joint, it is constituted by an elastic member that presses the pipe end surface of the insertion portion to prevent rust by being inserted into the insertion portion, and a holding portion that holds the elastic member with the tube end surface An annular rust preventive member,
The holding portion extends in an insertion direction into the insertion portion, and extends from the inner peripheral surface of the receiving port to the extension portion that engages with the outer peripheral surface of the insertion portion. A sliding contact portion that is formed in a large diameter and is formed so as to be elastically deformable that gradually expands in the insertion direction, and a holding piece portion that extends from the extending portion toward the inner diameter side. When the insertion portion is configured to be inserted into the receiving portion, the sliding contact portion and an inner peripheral surface of the receiving portion are in sliding contact with each other so that the holding portion and the insertion portion are connected to the insertion portion. The rust preventive member is characterized in that the elastic member is clamped between the tube end surface and the holding piece by moving the tube relative to each other in the tube axis direction.   The outer end of the elastic member bulges toward the insertion direction of the rust preventive member into the insertion portion, and is sandwiched between the outer peripheral surface of the insertion portion and the extending portion. The rust preventive member according to claim 1, wherein a bulging portion is provided.   The rust preventive member according to claim 1, wherein the holding portion includes a core material at a bent portion formed by the extending portion and the holding piece portion.   4. The gap according to claim 1, wherein a gap that allows the elastic member that is elastically deformed to extend in an outer diameter direction is formed between the holding portion and the insertion portion. The antirust member as described in 2.

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