JP2011144855A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint, capable of maintaining rust prevention of a pipe end surface of a spigot portion even if the spigot portion is moved relatively in a separating direction from a socket portion. <P>SOLUTION: In the pipe joint 1 to be water-tightly connected by inserting the spigot portion 3a to the socket portion 2a, a rust-preventing member 5 includes a locking means 5d which is engagingly locked by the spigot portion 3a while covering the pipe end surface 3b, and is movable within the socket portion 2a while covering the pipe end surface 3b along the pipe axis C of the socket portion 2a. Even if an unexpected external force by earthquake or the like is caused to relatively move the spigot portion 3a in the separating direction relative to the socket portion 2a, the rust-preventing member 5 moves relatively to the socket portion 2a together with the spigot portion 3a while covering the pipe end surface 3b of the spigot portion 3a, whereby the rust prevention of the pipe end surface 3b of the spigot portion 3a is regularly maintained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an insertion port formed at the distal end portion of one fluid pipe on the tube axis direction side, and the insertion direction of the other fluid tube having the annular rear end surface inserted into the insertion port. A receiving portion formed at the distal end portion on the side and an elastic member formed in an annular shape, disposed between the tube end surface and the back end surface of the insertion portion, and inserted into the receiving portion. The present invention relates to a pipe joint that includes a rust preventive member that covers a pipe end face by bringing a pipe end face of an opening into contact with an elastic member, and is connected in a watertight manner by inserting the insertion opening into a receiving opening.

  Conventionally, by arranging an annular anticorrosion member (rust prevention member) on the inner peripheral surface of the receiving port constituting one fluid pipe, and inserting the insertion port constituting the other fluid pipe into the receiving port, A pipe joint in which the tube end surface of the insertion portion is brought into contact with the anticorrosion member, and the anticorrosion member is elastically deformed between the tube end surface of the insertion portion and the back end surface of the receiving portion to prevent corrosion (rust prevention) of the tube end surface. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2009-8125 (page 9, FIG. 5)

  However, in the pipe joint described in Patent Document 1, when an unexpected insertion force such as an earthquake occurs and the insertion port is relatively moved in the direction of detachment from the receiving port, the tube end surface of the insertion port The elastic deformation of the anticorrosion member (rust prevention member) by the back end surface of the receiving portion is released, the pipe end surface of the insertion portion is separated from the anticorrosion member, and the anticorrosion member is connected to the tube end surface of the insertion portion. There is a problem that anticorrosion (rust prevention) is released.

  The present invention has been made paying attention to such problems, and can maintain rust prevention of the tube end face of the insertion portion even if the insertion portion is relatively moved in the direction of detachment from the receiving portion. It aims at providing the pipe joint which can be performed.

In order to solve the above problems, the pipe joint of the present invention is
An insertion port formed at the distal end portion of one fluid pipe in the tube axial direction, and a distal end of the other fluid tube in which the insertion portion is inserted and has an annular rear end surface on the inner peripheral surface A receiving portion formed in the portion, and an elastic member formed in an annular shape, disposed between the tube end surface and the back end surface of the insertion portion, and inserted into the receiving portion. A rust preventive member that covers the tube end surface by bringing the tube end surface of the insertion portion into contact with the elastic member, and the insertion portion is inserted into the receiving portion to be connected in a watertight manner. A pipe joint,
The rust preventive member includes a locking means that locks the tube end surface in a state of covering the tube end surface, and the tube end surface is covered in the tube port direction of the receiving portion in the state of covering the tube end surface. It is characterized by being movable along.
According to this feature, the rust prevention member rusted the pipe end face of the insertion portion even when the insertion portion is moved relative to the receiving portion in the direction of separation due to an unexpected external force such as an earthquake. Since it moves relative to the receiving portion together with the insertion portion in the state, rust prevention for the tube end surface of the insertion portion can always be maintained.

The pipe joint of the present invention is
A protrusion is provided on the inner peripheral surface of the receiving portion so as to face the insertion portion, and the rust preventive member is arranged to be movable between the protrusion and the back end surface. It is characterized by having.
According to this feature, the insertion portion is moved relative to the receiving portion by a predetermined amount in the removal direction, so that the rust preventive member abuts the protrusion and the insertion portion is moved away from the receiving portion in the removal direction. The movement can be restricted, and the removal of the insertion portion from the receiving portion can be prevented. In addition, by adjusting the position where the protrusion is provided on the inner peripheral surface of the receiving portion, the amount of movement of the insertion portion in the detaching direction with respect to the receiving portion can be adjusted as appropriate.

The pipe joint of the present invention is
The locking means is a claw portion formed in a barb shape that is bent in the insertion direction of the insertion portion toward the radial direction of the insertion portion.
According to this feature, the locking portion generated between the claw portion and the insertion portion can be strengthened by moving the insertion portion relative to the receiving portion in the detaching direction. It is possible to prevent the rust preventive member from dropping from the insertion portion in association with the relative movement in the separation direction with respect to the receiving portion.

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 antirust cover arrange | positioned in a receptacle part. (A) is sectional drawing which shows the state which the rust prevention cover rusted the pipe end surface of the insertion part, (b) is a cross section which shows the state which the rust prevention cover moved in the receiving part with the insertion part FIG. It is sectional drawing which shows the state which the rust prevention cover in Example 2 rusted the pipe end surface of the insertion part.

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

  The pipe joint according to the first embodiment 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. Reference numeral 1 in FIG. 1 is a pipe joint to which the present invention is applied.

  As shown in FIG. 1, the pipe joint 1 in the present embodiment includes a fluid pipe 2 having a receiving part 2a formed at a tip part on the tube axis C direction side, and a receiving part on a tip part on the tube axis C direction side. A fluid pipe 3 having an insertion port 3a to be inserted into 2a, a seal member 4 having elasticity and preventing leakage of fluid from between the receiving port 2a and the insertion port 3a, It is comprised from the rust prevention cover 5 as a rust prevention member in this invention for carrying out the rust prevention of the pipe end surface 3b of the opening part 3a. These fluid pipes 2 and 3 are, for example, water pipes for flowing clean water as a fluid therein.

  Moreover, the front-end | tip of the opening part 2a is formed in the internal peripheral surface 2b with an internal diameter larger than the outer diameter of the insertion part 3a. A plurality of recesses 2c that open toward the tube axis C are formed at the tip of the receiving portion 2a over the circumferential direction of the receiving portion 2a. In these recesses 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 concave portions 2c, and are bolted with bolts 7. For this reason, the fixed claw 6 is pressed toward the tube axis C by screwing the bolt 7. An annular fitting groove 2e for fitting a fitting portion 4a (to be described later) of the seal member 4 is formed on the inner side of the inner peripheral surface 2b of the receiving portion 2a on the back side of the recess 2c.

  An annular protrusion 2f is provided on the inner side of the inner peripheral surface 2b of the receiving portion 2a behind the fitting groove 2e so as to face the outer peripheral surface 3c of the insertion portion 3a inserted into the receiving portion 2a. (See FIG. 3). Further, on the inner side of the inner peripheral surface 2b of the receiving port portion 2a, on the back side of the protrusion 2f, the tube shaft C is substantially connected to the inner peripheral surface 2g having a smaller diameter than the tip of the receiving port portion 2a. An annular back end face 2h that is vertical is formed.

  Although not particularly illustrated, the inner peripheral surfaces 2b and 2g of the fluid pipe 2 and the inner peripheral surface 3d of the fluid pipe 3 are rust-proofing treatments for preventing rust from the fluid flowing in the fluid pipes 2 and 3, A thin coating layer is formed of mortar or rust preventive paint.

  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 rust preventive rubber 5a formed in a ring shape and a guide ring 5b to which the rust preventive rubber 5a is fixed. The guide ring 5b is composed of a thin plate-like elastic body such as spring steel, and the inner diameter of the receiving portion 2a is such that the outer diameter in the natural state is between the protrusion 2f of the receiving portion 2a and the back end surface 2h. Are formed in a C-shape in front view of approximately the same size.

  In addition, a support plate portion 5c is formed at the rear end portion of the guide ring 5b so as to extend substantially perpendicularly toward the diameter reducing direction over the entire circumference of the guide ring 5b, and on the front side of the support plate portion 5c. Antirust rubber 5a is arranged. The rust preventive rubber 5a is fixed to the front surface of the support plate portion 5c with an adhesive or the like. For this reason, the rust preventive cover 5 is pressed from the outside toward the reduced diameter direction, whereby the support plate portion 5c is curved and the rust preventive rubber 5a can be contracted in the reduced diameter direction (FIG. 2 ( a) See alternate long and short dash lines).

  Further, the tip portion of the guide ring 5b is formed with a plurality of locations (three locations in the present embodiment) arranged at equal intervals longer than the other locations, and is directed toward the diameter reduction direction of the guide ring 5b. Then, it is bent to the back side of the guide ring 5b, which is the insertion direction of the insertion opening 3a, and is formed in a bar-shaped claw portion 5d as locking means in the present invention. The tip of the claw portion 5d in the natural state protrudes toward the reduced diameter direction of the guide ring 5b from the outer peripheral surface 3c of the insertion portion 3a described later.

  In this embodiment, the support plate portion 5c is formed in the direction of the diameter reduction over the entire circumference of the guide ring. However, a plurality of support plates provided around the guide ring 5b at predetermined intervals are provided. The guide ring 5b may be formed toward the diameter-reducing direction, and the plurality of claw portions 5d provided around the predetermined interval from the diameter-extending direction end of the support plate portion 5c without forming the guide ring 5b. May be formed.

  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. 2A and FIG. 3, the rust preventive cover 5 is contracted by pressing in the direction of diameter reduction from the outside, and the protrusion 2f in the receiving portion 2a remains in the contracted state. The rust preventive cover 5 is disposed between the rear end face 2h, and the rust preventive cover 5 is further pushed toward the rear end face 2h to bring the rear end face 2h and the support plate portion 5c into contact with each other.

  At this time, the rust-proof cover 5 is released from the outside in the reduced diameter direction by the elastic restoring force of the guide ring 5b, so that the receiving portion 2a between the projection 2f and the back end surface 2h The diameter of the inner peripheral surface 2b is increased to the same outer diameter as that of the inner peripheral surface 2b, and the interior of the receiving portion 2a can be moved along the tube axis C between the protrusion 2f and the rear end surface 2h. In this embodiment, the outer diameter of the guide ring 5b in the natural state is formed to be approximately the same as the inner diameter of the receiving portion 2a between the protrusion 2f of the receiving portion 2a and the back end surface 2h. The inner diameter of the receiving portion 2a between the protrusion 2f of the mouth portion 2a and the back end surface 2h may be slightly smaller than the outer diameter of the guide ring 5b in the natural state.

  Next, as shown to Fig.4 (a), after fitting the fitting part 4a of the sealing member 4 over the perimeter of the fitting groove 2e, the insertion part 3a is inserted in the receiving part 2a. By doing so, the valve part 4b is elastically deformed by the outer peripheral surface 3c of the insertion part 3a and the inner peripheral surface 2b of the reception part 2a, and the space between the insertion part 3a and the reception part 2a is sealed watertight.

  At the same time, the rust preventive cover 5 is pressed against the back end face 2h while the pipe end face 3b is in contact with the rust preventive rubber 5a, and the pipe end face 3b is rust proof with the rust preventive rubber 5a. At this time, the claw portion 5d is caused to ride on the outer peripheral surface 3c of the insertion portion 3a while being elastically deformed, and the tip of the claw portion 5d is strongly bitten into the outer peripheral surface 3c of the insertion portion 3a by the restoring force of the claw portion 5d. Can do. By doing in this way, rust prevention by the rust prevention rubber 5a of the pipe end surface 3b of the insertion part 3a and the latching to the outer peripheral surface 3c of the insertion part 3a by the claw part 5d are made.

  Then, as shown in FIG. 4 (a), each of the bolts 7 is screwed to cause the sharp blade 6a of each fixed claw 6 to bite into the outer peripheral surface 3c of the insertion portion 3a, thereby receiving the insertion portion 3a. It fixes in the part 2a, and the connection of the fluid pipes 2 and 3 is completed. For this reason, rust prevention by the rust preventive rubber 5a is maintained while the rust preventive rubber 5a and the support plate part 5c are sandwiched between the pipe end face 3b of the insertion opening 3a and the back end face 2h of the receiving opening 2a.

  As shown in FIGS. 4 (a) and 4 (b), an unexpected external force such as an earthquake is generated from this state, so that the fixed pawl 6 tilts in the recess 2c and the outer peripheral surface of the insertion portion 3a. Even if the insertion portion 3a is relatively moved along the tube axis C in the direction of detachment from the receiving portion 2a while making the locking with respect to 3c stronger, the rust preventive cover 5 is provided with the outer peripheral surface 3c of the insertion portion 3a. Since it is locked by the claw portion 5d, the tube end surface 3b is kept rust-proof by the rust-preventive rubber 5a, and is relatively moved along the tube axis C in the direction of detachment from the receiving portion 2a together with the insertion portion 3a. can do.

  When the rust-proof cover 5 moves relative to the detachment direction side from the receiving portion 2a along with the predetermined amount insertion portion 3a along the tube axis C, the tip of the guide ring 5b comes into contact with the protruding portion 2f, and the guide ring 5b Movement is restricted. For this reason, since the nail | claw part 5d further bites into the outer peripheral surface 3c of the insertion part 3a, the relative movement to the removal direction side of the further insertion part 3a from the receiving part 2a is controlled by using this biting as a supporting force. Is done.

  When unexpected external force such as an earthquake occurs again from the state shown in FIG. 4 (b), the insertion portion 3a and the rust prevention cover 5 are relatively moved toward the insertion direction side of the reception portion 2a. As shown in FIG. 4A, the rust preventive cover 5 comes into contact with the back end surface 2h at the support plate portion 5c. For this reason, the relative movement of the insertion portion 3a toward the insertion portion 2a in the insertion direction is restricted by the support plate portion 5c of the rust prevention cover 5 coming into contact with the back end surface 2h. Furthermore, since the impact generated when the support plate portion 5c comes into contact with the back end surface 2h is alleviated by the rust preventive rubber 5a when transmitted to the insertion portion 3a, the vicinity of the tube end surface 3b of the insertion portion 3a. Can be prevented from being damaged by an impact generated when the support plate portion 5c and the back end surface 2h come into contact with each other.

  As described above, in the pipe joint 1 according to the present embodiment, the insertion portion 3a formed at the distal end portion of the one fluid pipe 3 on the tube axis C direction side and the insertion portion 3a are inserted, and the inner peripheral surface 2b. A receiving port 2a formed at the tip of the other fluid pipe 2 having the annular back end surface 2h on the tube axis C direction side, and a rust preventive rubber 5a formed in an annular shape. Rust prevention that is arranged between the pipe end face 3b and the back end face 2h and that covers the pipe end face 3b by bringing the pipe end face 3b of the insertion part 3a inserted into the receiving part 2a into contact with the rust preventive rubber 5a. A pipe joint 1 that is watertightly connected by inserting the insertion part 3a into the receiving part 2a, and the rust-proof cover 5 is inserted in a state of covering the pipe end surface 3b. A locking means for locking to the portion 3a is provided, and the inside of the receiving portion 2a can be moved along the tube axis C direction of the receiving portion 2a with the tube end surface 3b covered Therefore, even if the insertion port 3a is moved relative to the receiving port 2a due to an unexpected external force such as an earthquake, the anticorrosion cover 5 is provided with the pipe end surface 3b of the insertion port 3a. Since it moves relative to the receiving portion 2a together with the insertion portion 3a in a rust-proof state, rust prevention for the tube end surface 3b of the insertion portion 3a can always be maintained.

  Further, a protrusion 2f is provided on the inner peripheral surface 2b of the receiving portion 2a so as to face the insertion portion 3a, and the rust preventive cover 5 moves between the protrusion 2f and the back end surface 2h. Since the insertion portion 3a is moved relative to the receiving portion 2a by a predetermined amount relative to the receiving portion 2a, the anticorrosion cover 5 comes into contact with the projection 2f and receives the insertion portion 3a. The movement of the mouth portion 2a in the separation direction can be restricted, and the insertion portion 3a can be prevented from being detached from the mouth portion 2a. In addition, by adjusting the position where the protrusion 2f is provided on the inner peripheral surface 2b of the receiving portion 2a, the amount of movement of the insertion portion 3a in the direction of separation with respect to the receiving portion 2a can be adjusted as appropriate.

  Further, since the locking means is a claw portion 5d formed in a barb shape that is bent in the insertion direction of the insertion portion 3a toward the radial direction of the insertion portion 3a, the insertion portion 3a is the receiving portion 2a. Since the locking force generated between the claw portion 5d and the insertion portion 3a can be strengthened by being relatively moved in the separation direction, the insertion portion 3a is in the separation direction with respect to the receiving portion 2a. It is possible to prevent the rust preventive cover 5 from falling off from the insertion portion 3a with relative movement.

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

  As shown in FIG. 5, the guide ring 5 b constituting the rust preventive cover 5 in the second embodiment is provided with a claw portion 5 e as a locking means in the present invention. The tip of the claw portion 5e is formed in a bent portion 5f that is bent in a substantially arc shape toward the outer peripheral surface 3c of the insertion portion 3a inserted into the receiving portion 2a.

  By causing the bent portion 5f to ride on the outer peripheral surface 3c of the insertion portion 3a, the rust preventive cover 5 has a frictional force generated between the bent portion 5f and the outer peripheral surface 3c of the insertion portion 3a. Locked to the outer peripheral surface. For this reason, since the nail | claw part 5e in a present Example does not bite into the outer peripheral surface 3c of the insertion part 3a, and is not damaged, the antirust coating etc. which were apply | coated to the outer peripheral surface 3c of the insertion part 3a are carried out. It is possible to prevent peeling by biting.

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

  Further, in the embodiment, the claw portions 5d as the locking means are provided at a plurality of positions on the tip portion of the guide ring 5b. However, the claw portion is provided integrally over the entire circumference of the tip portion of the guide ring 5b. You may make it strengthen the latching force with respect to the outer peripheral surface 3c of the insertion part 3a by a part.

  Moreover, in the said Example, although each nail | claw part 5d is latched to the outer peripheral surface 3c of the insertion part 3a, it is a guide ring from the diameter reduction direction side edge part of the guide ring 5b in the support plate part 5c of the guide ring 5b. A plurality of claw portions are provided toward the front side of 5b, and these claw portions are engaged with the inner peripheral surface of the insertion portion 3a so that the rust preventive cover 5 covers the tube end surface 3b of the insertion portion 3a. The mouth portion 3a and the rust preventive cover 5 may be movable along the tube axis C in the mouth portion 2a.

  Moreover, in the said Example, after arrange | positioning the antirust cover 5 between the protrusion 2f in the receiving part 2a, and the back end surface 2h, the fitting part 4a of the sealing member 4 is used as the fitting groove 2e of the receiving part 2a. The insertion portion 3a is inserted into the receiving portion 2a and the claw portion 5d is placed on the outer periphery of the receiving portion 2a in a state where the fitting portion 4a of the seal member 4 is fitted into the fitting groove 2e. You may make it insert the insertion part 3a of the state which made the surface 3c latch on a surface and rust-prevented the pipe end surface 3b with the antirust cover 5. FIG.

  Moreover, in the said Example, although the outer diameter in the natural state of the guide ring 5b was formed substantially the same dimension as the internal diameter of the receiving part 2a between the protrusion 2f of the receiving part 2a and the back end surface 2h, The outer diameter of the ring 5b in the natural state may be slightly smaller than the inner diameter of the receiving portion 2a between the protrusion 2f of the receiving portion 2a and the back end surface 2h. In this case, when the dimension of the guide ring 5b on the tube axis C direction side is long, the rust preventive cover 5 is disposed between the protrusion 2f of the receiving port 2a and the back end surface 2h. In addition, it is possible to prevent the rust preventive cover 5 from being tilted in the direction of the tube axis C to shift the arrangement position.

  Further, by forming the outer diameter of the guide ring 5b slightly smaller than the inner diameter of the receiving portion 2a between the protruding portion 2f of the receiving portion 2a and the rear end surface 2h, the rust preventive cover 5 is provided with the receiving portion 2a. If the tube end surface 3b comes into contact with the claw portion 5d when the insertion port 3a is inserted into the receiving port 2a even if they are not arranged on the same tube axis C, the further depth of the insertion port 3a is increased. The insertion portion 3a and the rust-proof cover 5 are arranged on the same tube axis C by being pushed toward the end face 2h, and the outer diameters of the guide ring 5b and the rust-proof rubber 5a are set via the claw portion 5d. Thus, the rust preventive rubber 5a can be expanded until the pipe end surface 3b can be rusted over the entire circumference.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Fluid pipe 2a Receiving part 2f Protrusion part 2g Inner peripheral surface 2h Deep end surface 3 Fluid pipe 3a Insertion part 3b Pipe end surface 3c Outer peripheral surface 5 Rust prevention cover (rust prevention member)
5a Rust prevention rubber (elastic member)
5b Guide ring 5c Support plate part 5d, 5e Claw part (locking means)
5f bent part

Claims (3)

An insertion port formed at the distal end portion of one fluid pipe in the tube axial direction, and a distal end of the other fluid tube in which the insertion portion is inserted and has an annular rear end surface on the inner peripheral surface A receiving portion formed in the portion, and an elastic member formed in an annular shape, disposed between the tube end surface and the back end surface of the insertion portion, and inserted into the receiving portion. A rust preventive member that covers the tube end surface by bringing the tube end surface of the insertion portion into contact with the elastic member, and the insertion portion is inserted into the receiving portion to be connected in a watertight manner. A pipe joint,
The rust preventive member includes a locking means that locks the tube end surface in a state of covering the tube end surface, and the tube end surface is covered in the tube port direction of the receiving portion in the state of covering the tube end surface. A pipe joint characterized by being movable along.   A protrusion is provided on the inner peripheral surface of the receiving portion so as to face the insertion portion, and the rust preventive member is arranged to be movable between the protrusion and the back end surface. The pipe joint according to claim 1, wherein the pipe joint is provided.   The said latching means is a nail | claw part formed in the shape of a barb bent in the insertion direction of this insertion part toward the radial direction of the said insertion part. Pipe fittings.

Images