JP2012154401A - Rust preventive member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rust preventive member capable of restraining the extension of the rust preventive member to the inner diameter direction side caused by elastic deformation of an elastic member, while preventing rust by allowing the elastic member to abut on a pipe end surface of a spigot part, by being inserted-fitted into the spigot part.SOLUTION: A holding part 5b is constituted of an extension part 5c extended toward the inserting-fitting direction to the spigot part 3a and engaging with an outer peripheral surface 3c of the spigot part 3a, a holding piece part 5d extended toward the inner diameter direction side from the extension part 5c, and a projection part 5g extended toward the inserting-fitting direction to the spigot part 3a on the inner diameter side more than the extension part 5c in the holding piece part 5d. The elastic member 5a is arranged between the extension part 5c and the projection part 5g on the inserting-fitting direction side to the spigot part 3a of the holding piece part 5d, and a cutout part 5h for allowing the extension of the elastically deforming elastic member 5a is formed on the outer diameter side from an inner diameter side end part of the elastic member 5a in a side end part in the inserting-fitting direction to the spigot part 3a of the elastic member 5a.

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 a rubber adhesive (elastic member) is bonded to the end face and the tip face is rust-prevented, a part of the rubber adhesive is exposed between the tip face of the tube and the inward protruding piece (holding piece). There is a problem that the rubber-based adhesive extends into the fluid flowing in the pipe body.

  The present invention has been made paying attention to such problems, and by inserting into the insertion portion, rust prevention is achieved by the elastic member coming into contact with the tube end surface of the insertion portion, It aims at providing the rust prevention member which can prevent the extension to the inner diameter direction side of the rust prevention member accompanying elastic deformation.

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 the insertion direction into the insertion portion, and extends to engage with the outer peripheral surface of the insertion portion, and extends from the extension portion toward the inner diameter side. The holding piece portion, and a protruding portion extending in the insertion direction to the insertion portion on the inner diameter side of the extending portion in the holding piece portion, and the elastic member Is arranged between the extending portion and the protruding portion on the insertion direction side of the holding piece portion to the insertion portion,
A cutout portion that allows the elastic member to be elastically deformed to extend is formed from the inner diameter side end portion of the elastic member to the outer diameter side at the end portion in the insertion direction of the elastic member into the insertion port. It is characterized by having.
According to this feature, when the rust preventive member is inserted into the insertion portion, the elastic member is brought into close contact with the pipe end surface from the outer diameter side, thereby extending the elastic member to the inner diameter side caused by elastic deformation of the elastic member. The protrusion is restrained by the protruding portion, and the elastic member elastically deformed in the gap formed in the insertion direction side of the notch portion into the insertion portion is released, and the elastic member is extended from the holding portion of the elastic member to the inner diameter side of the rust prevention member. Can be prevented.

The rust preventive member of the present invention is
The cutout portion is formed by a tapered surface that is inclined from an inner diameter side end portion of the elastic member to an outer diameter side toward an insertion direction into the insertion portion.
According to this feature, after the tube end surface and the outer diameter side end portion of the elastic member are brought into contact with each other, the taper surface is directed toward the inner diameter side of the elastic member by pressing the rust preventive member against the tube end surface. , Because it sticks to the tube end surface while bulging into the gap formed in the insertion direction side of the taper surface into the insertion port, so that air bubbles or the like do not enter between the elastic member and the tube end surface Can do.

The rust preventive member of the present invention is
The protruding portion is formed so as to abut on the pipe end surface after elastic deformation of the elastic member by insertion into the insertion opening.
According to this feature, when the rust preventive member is inserted into the insertion portion, the elastic member comes into contact with the pipe end surface before the protruding portion and starts elastic deformation. It can be made to adhere in a state of being fully elastically deformed and familiar.

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 extending portion and the insertion portion.
According to this feature, a part of the elastic member that has been elastically deformed is accommodated in the gap, and the amount of the elastic member that tends to extend from the holding portion toward the inner diameter direction of the rust prevention member can be suppressed.

The rust preventive member of the present invention is
The holding portion is provided with a pressing portion that presses the holding piece portion toward the pipe end surface by contacting the inner surface of the receiving portion.
According to this feature, even when the elastic member is not completely adhered to the pipe end surface when the rust preventive member is inserted into the insertion portion, the insertion portion is inserted into the reception portion, and the pressing portion is received as the reception portion. Since the elastic member is clamped between the tube end surface and the holding piece by contacting the inner surface of the tube, the tube end surface and the elastic member can be securely adhered to each other.

The rust preventive member of the present invention is
The pressing portion has elasticity, and the receiving portion is provided with a locking means for restricting movement of the insertion portion in the receiving portion.
According to this feature, the insertion portion is inserted into the receiving portion, the pressing portion is brought into contact with the inner surface of the receiving portion, and the insertion portion is inserted into the receiving portion by the locking means in a state where the pressing portion is elastically deformed. By locking, due to the restoring force generated in the pressing portion due to elastic deformation, it is possible to continue the adhesion of the elastic member to the tube end surface even after the insertion of the insertion portion into the receiving portion is completed.

It is a disassembled sectional view of a pipe joint which shows a mouth part and an insertion part in Example 1. (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. (A) is sectional drawing which shows the state which the rust prevention cover rusted the pipe end surface of the insertion part, (b) is sectional drawing which shows the state in which the insertion part was inserted in the receiving part. . It is sectional drawing of the antirust cover as a 1st modification in Example 1. FIG. It is sectional drawing of the antirust cover as a 2nd modification in Example 1. FIG. It is sectional drawing of the antirust cover in Example 2. It is sectional drawing which shows the state by which the insertion part was inserted in the receiving part.

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

  The rust preventive member according to Example 1 will be described with reference to FIGS. Hereinafter, in this embodiment, the left side of the paper surface in FIGS. 1, 2B, 3, 4A, and 4B is the front side (front side) of the anticorrosion cover, and FIG. ) Is the front side (front side) of the anticorrosion cover. The code | symbol 1 of FIG. 1 is a pipe joint to which the antirust cover 5 as an antirust member in this invention was applied.

  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, whereby 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-proof cover 5 And is composed of. 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.

  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 coated with a rust preventive paint (not shown) over substantially the entire circumference of the outer peripheral surface 3c after casting, so that the rust preventive effect of the outer peripheral surface 3c of the fluid pipes 2 and 3 is achieved. As a result, the rise of

  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 4A, the seal member 4 includes a fitting portion 4a fitted in the fitting groove 2e. 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. From the piece 5c, the holding piece 5d extending from the rear end of the outer peripheral piece 5c toward the inner diameter direction of the anticorrosion cover 5, and the inner diameter side end of the holding piece 5d It is comprised from the protrusion part 5g extended toward the front side of the antirust cover 5 which is the insertion direction to the insertion part 3a of the cover 5. As shown in FIG.

  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.

  Between the protrusion part 5g and the outer peripheral piece part 5c in the holding piece part 5d, the rust preventive rubber 5a described above protrudes from the protrusion part 5g toward the front side of the rust preventive cover 5 over the entire periphery. Is arranged. The rust preventive rubber 5a is in contact with the inner peripheral surface 5e of the outer peripheral piece 5c at the outer peripheral surface, and is in contact with the outer peripheral surface of the protruding portion 5g at the inner peripheral surface.

  Furthermore, the inner diameter side end portion of the front surface of the rust preventive rubber 5a in this embodiment is inserted into the insertion portion 3a of the rust preventive cover 5 from the inner diameter side end portion of the rust preventive rubber 5a toward the outer diameter side. A tapered surface 5h is formed as a notch portion in the present invention, which is inclined toward the front side of the rust preventive rubber 5a which is the fitting direction. For this reason, a gap is formed between the front side end of the rust preventive rubber 5a and the tapered surface 5h.

  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-proof cover 5 is inserted and fitted toward the tube end surface 3b of the insertion portion 3a while being in contact. At this time, since the diameter of the rear end portion side of the rust preventive cover 5 is slightly longer than the diameter of the insertion portion 3a, the rear end portion side of the outer peripheral piece 5c and the insertion portion 3a are formed. A gap 8 is formed.

  Further, the rust preventive rubber 5a is pressed toward the tube end surface 3b by the holding piece 5d by further fitting the rust preventive cover 5 toward the tube end surface 3b of the insertion port 3a. 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 outer peripheral surface 3c by the restoring force in the diameter reducing direction of the outer peripheral piece 5c, and the rust preventive is performed. The front side of the rubber 5a contacts the pipe end surface 3b over the entire circumference. A part of the rust preventive rubber 5a elastically deformed by contacting the pipe end surface 3b is a front surface of the rust preventive rubber 5a in a gap formed between the tapered surface 5h and the front end of the rust preventive rubber 5a. As a result, the rust preventive rubber 5a gradually elastically deforms from the outer side to the inner diameter side of the rust preventive rubber 5a on the front side of the tapered surface 5h over substantially the entire circumference of the pipe end surface 3b. At the same time, it is in close contact with the tube end surface 3b.

  At the same time, the outer diameter side of the rust preventive rubber 5a on the rust preventive cover 5 is a gap 8 formed between the rear end side of the outer peripheral piece 5c and the insertion portion 3a due to elastic deformation of the rust preventive rubber 5a. It is extended in. On the other hand, the inner diameter side of the rust preventive rubber 5a in the rust preventive cover 5 extends from the guide ring 5b toward the inner diameter side and the outer diameter side of the rust preventive cover 5 along with the elastic deformation of the rust preventive rubber 5a. The extension of the rust preventive rubber 5 a toward the outer diameter side of the rust preventive cover 5 is suppressed by part of the rust preventive rubber 5 a extending into the gap 8.

  Further, the extension of the rust preventive rubber 5a toward the inner diameter side of the rust preventive cover 5 is caused by the protruding portion 5g coming into contact with the pipe end surface 3b after the rust preventive rubber 5a is elastically deformed. A part of the rubber 5a is in close contact with the entire outer peripheral surface of the protrusion 5g. For this reason, the extension toward the inner diameter side of the rust preventive rubber 5a is restricted, and the rust preventive rubber 5a rusts the pipe end surface 3b except the inner diameter side of the rust preventive cover 5 of the lining layer 3f over the entire circumference. .

  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. In this range, the projections 5f and 5f projecting from the outer peripheral piece 5c are more strongly engaged with the outer peripheral surface 3c by the force to be elastically restored.

  By the engagement of each of the protrusions 5f, 5f and the outer peripheral surface 3c, the rust preventive cover 5 presses the insertion portion 3a in the radial direction by the outer peripheral piece portion 5c arranged on the outer diameter side, and the insertion portion 3a. Is positioned with respect to. 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.

  The rust preventive rubber 5a, the projecting portion 5g and the holding piece 5d are rustproof on the side made of ductile cast iron, which is the outer peripheral side of the pipe end surface 3b, while the end on the inner diameter side is the inner diameter of the lining layer 3f. It arrange | positions on the outer diameter side rather than a side edge part. 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.

  And after fitting the fitting part 4a of the sealing member 4 over the perimeter of the fitting groove 2e as shown in FIG. 4 (a) and FIG.4 (b), the antirust cover 5 was attached. By inserting the insertion portion 3a into the receiving portion 2a, while 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, The space between the receiving portion 2a is sealed in a watertight manner.

  Finally, as shown in FIG. 4 (b), each of the bolts 7 is screwed to cause the sharp blade 6a of each fixing claw 6 to bite into the outer peripheral surface 3c of the insertion portion 3a to receive the insertion portion 3a. It fixes in the opening part 2a, and the connection of the fluid pipes 2 and 3 is completed.

  In this embodiment, the rust preventive rubber 5a is inserted into the insertion end 3a of the rust preventive cover 5 from the inner diameter side end of the rust preventive rubber 5a toward the outer diameter side on the front side. The taper surface 5h which inclines toward the front side of the rust preventive rubber 5a which is the direction is formed. However, in the rust preventive cover 5 in the first modified example of this embodiment, as shown in FIG. From the inner diameter side end of 5a to the outer diameter side end, a tapered surface 5i is formed so that the entire front surface of the rust preventive rubber 5a is inclined toward the front side of the rust preventive rubber 5a.

  In this case, when the rust preventive cover 5 is inserted into the insertion opening 3a, the pipe end face 3b and the outer diameter side end of the rust preventive rubber 5a are brought into contact with each other, and then the rust preventive cover 5 is attached to the pipe end face 3b. The taper surface 5i gradually bulges toward the front side toward the inner diameter side of the rust-preventing rubber 5a, and comes into close contact with the pipe end surface 3b, so that the rust-preventing rubber 5a and the pipe end surface 3b Adhesion can be made without air bubbles or the like entering between them.

  In this embodiment, the rust preventive rubber 5a is applied to the inner peripheral surface 5e of the outer peripheral piece 5c between the protrusion 5g and the outer peripheral piece 5c of the holding piece 5d. The rust preventive cover 5 in the second modified example of the present embodiment is rust proof as shown in FIG. 6, although it is disposed in contact with the outer peripheral surface of the protruding portion 5g at the inner peripheral surface. The inner peripheral surface of the rubber 5a is brought into contact with the outer peripheral surface of the protruding portion 5g, and the outer peripheral surface of the rust preventive rubber 5a and the inner peripheral surface 5e of the outer peripheral piece 5c are spaced apart.

  Furthermore, at the inner diameter side end portion of the front surface of the rust prevention rubber 5a, the rust prevention cover 5a is inserted in the insertion portion 3a from the inner diameter side end portion of the rust prevention rubber 5a toward the outer diameter side. A tapered surface 5h that is inclined toward the front side of the rust rubber 5a is formed, and from the outer diameter side end portion of the rust prevention rubber 5a of the tapered surface 5h to the outer diameter side end portion of the rust rubber 5a. The taper surface 5i which inclines toward the front side of the rust preventive rubber 5a is formed. The tapered surface 5i constitutes a notch in the present invention, like the tapered surface 5h.

  In this case, when the rust preventive cover 5 is inserted into the insertion portion 3a, the gap 8 formed between the rear end side of the outer peripheral piece 5c and the insertion portion 3a can be formed widely. The rust preventive rubber 5a which elastically deforms when the rust preventive rubber 5a and the pipe end surface 3b are brought into close contact with each other is extended into the gap 8, and the rust preventive cover 5 is extended toward the inner diameter side. The amount of rubber 5a can be reduced.

  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. Portion 5c, holding piece portion 5d extending from the outer peripheral piece portion 5c toward the inner diameter direction, and the insertion direction of the holding piece portion 5d on the inner diameter side from the outer peripheral piece portion 5c in the insertion opening 3a The rust preventive rubber 5a is formed between the outer peripheral piece 5c on the insertion direction side of the holding piece 5d and the protruding portion 5g. The rust preventive rubber 5a that is elastically deformed from the inner diameter side end of the rust preventive rubber 5a to the outer diameter side is disposed at the end of the rust preventive rubber 5a in the direction of insertion into the insertion portion 3a. Therefore, when the rust preventive rubber 5a is inserted into the insertion opening 3a, the rust preventive rubber 5a is inserted into the tube end surface 3b from the outer diameter side. By sticking, the extension of the rust preventive rubber 5a caused by elastic deformation of the rust preventive rubber 5a to the inner diameter side is suppressed by the protruding portion 5g, and the cutout portion is formed on the insertion direction side to the insertion portion 3a. The rust preventive rubber 5a elastically deformed into the gap can be released, and the extension of the rust preventive rubber 5a from the guide ring 5b to the inner diameter side of the rust preventive cover 5 can be prevented.

  Moreover, since the notch is formed by the tapered surface 5h that is inclined from the inner diameter side end of the rust preventive rubber 5a to the outer diameter side in the insertion direction to the insertion port 3a, the pipe end surface 3b After contacting the outer diameter side end of the rust preventive rubber 5a, the taper surface 5h is tapered toward the inner diameter side of the rust preventive rubber 5a by pressing the rust preventive cover 5 against the pipe end face 3b. The air bubbles and the like enter between the rust preventive rubber 5a and the tube end surface 3b because the surface 5h sticks to the tube end surface 3b while bulging into the gap formed in the insertion direction side to the insertion port 3a. It can be closely attached.

  Further, since the protruding portion 5g is formed so as to come into contact with the tube end surface 3b after elastic deformation of the rust preventive rubber 5a by insertion into the insertion portion 3a, the rust prevention cover 5 is inserted into the insertion portion 3a. When the rust preventive rubber 5a comes into contact with the tube end surface 3b before the protruding portion 5g and starts elastic deformation, the rust preventive rubber 5a is sufficiently elastically deformed with respect to the tube end surface 3b to be adapted. Can be brought into close contact with each other.

  Further, since a gap 8 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 5a. Can be accommodated in the gap 8, and the amount of the rust preventive rubber 5a trying to extend from the guide ring 5b toward the inner diameter direction of the rust preventive cover 5 can be suppressed.

  Next, a rust preventive member according to Example 2 will be described with reference to FIGS. In addition, the same structure as the said Example is abbreviate | omitted. Hereinafter, in the present embodiment, the left side of FIGS. 7 and 8 will be described as the front side (front side) of the antirust cover. As shown in FIG. 7, on the back surface of the holding piece portion 5d of the present embodiment, a spring portion 5j as a pressing portion in the present invention extends from the substantially central portion in the radial direction of the rust preventive cover 5 toward the back surface side. Has been.

  The spring portion 5j is formed in a bellows shape. For this reason, the spring portion 5j has elasticity, and can be expanded and contracted in the direction of the tube axis C while accumulating the restoring force by applying a force from the direction of the tube axis C.

  By configuring the rust prevention cover 5 in this manner, as shown in FIG. 8, after the rust prevention cover 5 is inserted into the insertion portion 3a as in the first embodiment, the insertion portion 3a is changed to the reception portion. By inserting it into 2a, the spring part 5j abuts on the back end face 2h which is the inner face in the receiving part 2a.

  And the insertion part 3a is further inserted in the receiving part 2a, and the spring part 5j is pinched between the insertion part 3a and the receiving part 2a, and it faces in the insertion direction of the insertion part 3a. Compressed and elastically deformed. At the same time, the spring portion 5j presses the holding piece portion 5d toward the tube end surface 3b by the restoring force generated by the elastic deformation, but the insertion portion 3a is formed between the valve 4b and the outer peripheral surface 3c of the insertion portion 3a. Since the movement is restrained by the frictional force generated therebetween, the rust preventive rubber 5a can be clamped between the pipe end surface 3b and the holding piece 5d.

  For this reason, for example, in the insertion of the insertion portion 3a into the receiving portion 2a, friction occurs between the rust prevention cover 5 and the valve portion 4b, and the attachment of the rust prevention cover 5 to the insertion portion 3a is weakened. Even if the tube end surface 3b and the rust preventive rubber 5a are not completely adhered to each other, the rust preventive rubber 5a between the tube end surface 3b and the holding piece portion 5d due to the restoring force of the spring portion 5j is removed. By the clamping pressure, the rust preventive rubber 5a and the pipe end surface 3b can be reliably brought into close contact with each other.

  And after inserting the insertion part 3a to the predetermined position in the receiving part 2a, by screwing in each bolt 7, the sharp blade 6a of each fixed nail | claw 6 is made to bite into the outer peripheral surface 3c of the insertion part 3a, The fluid pipes 2 and 3 are fixed so as to restrain the movement of the insertion portion 3a in the receiving portion 2a by the friction force generated between the fixed claw 6 and the valve portion 4b and the outer peripheral surface 3c of the insertion portion 3a. Complete the connection. That is, the fixed claw 6 and / or the seal member 4 in this embodiment can be the locking means in the present invention.

  After the insertion of the insertion portion 3a into the receiving portion 2a is completed, only the restoring force of the spring portion 5j acts so as to press the holding piece portion 5d toward the tube end surface 3b. Even after the insertion into the receiving portion 2a is completed, the adhesion between the rust preventive rubber 5a and the pipe end surface 3b is maintained, and even if the rust preventive rubber 5a is deteriorated due to aging or the like, the pipe end face 3b Rust prevention can be maintained.

  In addition, when the restoring force which has arisen in the spring part 5j is sufficiently strong, the spring part 5j presses the insertion part 3a in the detaching direction from the inside of the reception part 2a, so that the receiving part of the insertion part 3a. There is a slight movement in the direction of separation from within 2a. Along with this slight movement of the insertion portion 3a, each fixed claw 6 swings in a direction in which the sharp blade 6a deeply bites into the outer peripheral surface 3c of the insertion portion 3a. The fixing of the mouth portion 3a in the receiving portion 2a can be made stronger.

  Furthermore, since the elastic pressing body in the present embodiment is the spring portion 5j, an unexpected external force such as an earthquake acts on the insertion portion 3a in the reception portion 2a, so that the insertion portion 3a becomes the reception portion 2a. Even if it is relatively moved in the direction of overinsertion, the spring portion 5j acts as a buffer member that cushions the relative movement of the insertion portion 3a, and the insertion portion is caused by the insertion portion 3a colliding with the receiving portion 2a. It is possible to prevent damage to the portion 3a and the receiving portion 2a.

  As described above, in the rust-proof cover 5 according to the present embodiment, the guide ring 5b is provided with the spring portion 5j that presses the holding piece portion 5d toward the tube end surface 3b by contacting the back end surface 2h of the receiving portion 2a. Therefore, even when the rust preventive rubber 5a is not completely in close contact with the pipe end surface 3b when the rust preventive cover 5 is inserted into the insertion opening 3a, the insertion opening 3a is placed in the receiving opening 2a. By inserting and bringing the spring portion 5j into contact with the rear end surface 2h of the receiving portion 2a, the rust preventive rubber 5a is clamped between the tube end surface 3b and the holding piece portion 5d. The rust preventive rubber 5a can be adhered.

  Further, the spring portion 5j has elasticity, and the receiving portion 2a is provided with the fixing claw 6 and the seal member 4 that restrain the movement of the insertion portion 3a in the receiving portion 2a. The insertion portion 3a is inserted into the receiving portion 2a, the spring portion 5j is brought into contact with the back end surface 2h of the receiving portion 2a, and the spring portion 5j is elastically deformed to be inserted by the fixing claw 6 and the seal member 4. By locking the part 3a in the receiving part 2a, the restoring force generated in the spring part 5j by elastic deformation causes the guide ring 5b to adhere the rust preventive rubber 5a to the pipe end surface 3b. It can be continued even after the insertion into the part 2a is completed.

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

  Moreover, in the said Example, although the notch part in this invention was demonstrated as the taper surfaces 5h and 5i, at the inner diameter side edge part in the front side edge part of the rust prevention rubber 5a, the elastically deformed rust prevention rubber 5a can be released. If possible, the shape of the cutout may be a stepped portion having a corner.

  Moreover, in the said Example 2, although the spring part 5j was extended toward the back side from the approximate center of the radial direction in the antirust cover 5 of the back surface of the holding piece part 5d, the insertion part 3a is a receiving part. If the spring portion 5j can be brought into contact with the back end surface 2h by being inserted into 2a, the extending position of the spring portion 5j in the holding piece portion 5d is the inner diameter side end portion or the outer diameter side end portion. Also good.

1 Pipe Fitting 2 Fluid Pipe 2a Receiving Portion 2h Back End Surface 3 Fluid Pipe 3a Inserting Portion 3b Tube End Surface 4 Seal Member (Locking Means)
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 5g Projection 5h, 5i Tapered surface (notch)
5j Spring part (pressing part)
6 fixed claws (locking means)
8 Clearance C Tube axis

Claims (6)

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 the insertion direction into the insertion portion, and extends to engage with the outer peripheral surface of the insertion portion, and extends from the extension portion toward the inner diameter side. The holding piece portion, and a protruding portion extending in the insertion direction to the insertion portion on the inner diameter side of the extending portion in the holding piece portion, and the elastic member Is arranged between the extending portion and the protruding portion on the insertion direction side of the holding piece portion to the insertion portion,
A cutout portion that allows the elastic member to be elastically deformed to extend is formed from the inner diameter side end portion of the elastic member to the outer diameter side at the end portion in the insertion direction of the elastic member into the insertion port. A rust preventive member characterized by that.   The cutout portion is formed by a tapered surface that is inclined from an inner diameter side end portion of the elastic member to an outer diameter side in an insertion direction to the insertion portion. Rust prevention member as described.   3. The rust preventive member according to claim 1, wherein the protruding portion is formed so as to abut on the pipe end surface after elastic deformation of the elastic member by being inserted into the insertion portion.   4. A gap is formed between the extending portion and the insertion portion to allow the elastic member that is elastically deformed to extend in the outer diameter direction. The antirust member as described in 2.   5. The pressing part according to claim 1, wherein the holding part is provided with a pressing part that presses the holding piece part toward the pipe end face by contacting the inner surface of the receiving part. The antirust member as described in 2.   6. The pressing part according to claim 5, wherein the pressing part has elasticity, and the receiving part is provided with a locking means for restraining movement of the insertion part in the receiving part. Rust prevention member as described.

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