JP2008248983A - Insulating joint and method of assembling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulating joint capable of withstanding pullout force without using a metal material and insulating a joint body from a cap nut. <P>SOLUTION: In this insulating joint, the cap nut 4 made of a dissimilar metal is attached to a flange part 3 at one end of the joint body 2 through a ring insulating member 6. The insulating member 6 has a pullout prevention part 61 installed between the flange part 3 of the joint body 2 and the flange part 5 of the cap nut 4 and preventing the cap nut 4 from coming out of the joint body 2. A flange forming surface 31 is diagonally formed on the flange part 3 of the joint body 2, and the first flange contact surface 62 of the pullout prevention part 61 is tilted to bring the pullout prevention part 61 into surface contact with the flange forming surface 31. The flange forming surface 51 is diagonally formed on the flange part 5 of the cap nut 4, and the second flange contact surface 63 of the pullout prevention part 61 is tilted to bring the pullout prevention part 61 into surface contact with the flange forming surface 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an insulation joint provided in a flow path of water supply such as tap water and other fluids such as liquid and gas, and in particular, an insulation joint for preventing electrical corrosion due to a potential difference between a cap nut and a joint body and the joint. It relates to the assembly method.

  Conventionally, some pipe joints include a cap nut and a joint body. It is known that a metal ring is provided between the cap nut and the joint body so that the cap nut does not come out of the joint body. By the way, the joint body and the cap nut may be formed of different metals, for example, the joint body is made of stainless steel and the cap nut is made of bronze. In this case, corrosion occurs due to the potential difference between different metals between the joint body and the cap nut. In particular, when the fluid is water and the pipe joint is buried in the ground, the corrosion tends to occur. For this reason, the insulation coupling which provided the insulating member between the cap nut and the coupling main body is proposed (for example, refer patent documents 1 and 2).

The insulating joint described in Patent Document 1 is provided with a stop line member for preventing the cap nut from coming out of the joint body between the joint body and the cap nut, and the stop member is provided on the surface of the metal material. It is formed as an insulating member to which a non-conductive material is applied. The insulating joint described in Patent Document 2 is provided with an insulating cylinder and a retaining ring cylinder between the joint body and the cap nut. These insulating joints can prevent corrosion due to a potential difference because the cap nut and the joint body are in direct contact with each other through the insulating member.
JP 2000-81176 A JP 2005-351434 A

  In the insulated joint described in Patent Documents 1 and 2, an insulating member is provided between the joint body and the cap nut to prevent corrosion due to a potential difference. However, the insulating member is formed in a cylindrical shape having a flange portion whose one end portion extends radially outward, and the flange portion is in surface contact with each other between the flange portion of the joint body and the flange portion of the cap nut. Since it is located in the state, the force which tries to pull out the cap nut from the joint body acts intensively in the direction substantially orthogonal to the flange portion of the insulating member. For this reason, when pipes are connected with cap nuts, a non-conductive material attached to the surface of a metal material can be used as an insulating member so that it can withstand the pulling force that is the stress that acts when the pipe moves. (See Patent Document 1.) In addition to the insulating member, a metal retaining ring cylinder must be mounted (see Patent Document 2).

  Further, to attach the cap nut, after fitting the retaining wire member and the cap nut to the sleeve from the connecting end portion side of the sleeve, the connecting end portion of the sleeve is fixed to the pipe or the like by welding. Although the nut is attached (see Patent Document 1), the joint cannot be assembled unless welding is performed, and workability is poor. In addition, when connecting a pipe or the like using a flexible joint, it is proposed to connect the flexible joint to the sleeve by welding. In this case, however, the joint can be assembled unless welding is performed. It is not possible to work.

  In addition, in the method of assembling an insulating joint described in Patent Document 2, first, a cap nut is attached to the outer periphery of one end portion of the joint body, and the cap nut is moved to the center side of the joint body, so that a flange portion is provided. One end portion of the joint body including the exposed portion is exposed, a split ring-shaped retaining ring tube is inserted between the exposed one end portion and the cap nut, and the retaining ring tube is attached to the one end portion. After the mounting, the retaining ring cylinder is moved into the inside of the cap nut, and then a split ring-shaped insulating cylinder is inserted between the exposed end of the joint body and the cap nut. At this time, the insertion end of the insulating cylinder is inserted into the retaining ring cylinder. Thereby, the insulating cylinder and the retaining ring cylinder are mounted on the outer periphery of the cylindrical portion of the joint body in the cap nut, and the cap nut can be attached to the joint body, and the insulating joint is assembled.

  By the way, when the cap nut is attached to one end of the joint body, the cap nut is moved to the center of the joint body so that the insulation cylinder and retaining ring cylinder cannot be easily removed from the flange portion of the joint body. When it is made, the range which the one end part of a coupling main body exposes is narrow. Thus, if the range where the end of the cap nut is moved and the one end is exposed is narrow, the cap nut installation work is necessary to insert a retaining ring cylinder or insulating cylinder between the one end and the cap nut. The nature is bad.

  The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to withstand an extraction force without using a metal material and to insulate between a joint body and a cap nut. It is to provide a joint. Another object of the present invention is to provide a method for assembling an insulating joint that can be easily attached and has a reduced number of parts and can reduce costs.

  The invention according to claim 1 for achieving the above object is an insulating joint in which a cap nut of a dissimilar metal is attached to a flange portion at one end portion of a joint body via a ring-shaped insulating member, and the insulating member includes: A pull-out preventing portion provided between the flange portion of the joint body and the flange portion of the cap nut for preventing the cap nut from coming out from the joint body; and the pull-out preventing portion on the flange portion of the valve body main body. The flange forming surface that is in contact with the flange is formed by inclining, and the first flange contact surface of the pull-out preventing portion is inclined so that the pull-out preventing portion comes into surface contact with the flange forming surface, while the flange portion of the cap nut is The flange forming surface with which the pull-out preventing portion comes into contact is inclined, and the second flange contact of the pull-out preventing portion so that the pull-out preventing portion comes into surface contact with the flange forming surface. An insulating joint is tilted plane.

  The invention according to claim 2 is an insulating joint in which the insulating member includes a flange surrounding portion that covers an outer periphery of the flange portion of the joint body, and an extending portion that extends toward the center of the joint body.

  According to a third aspect of the present invention, the inner peripheral surface of the insulating member is formed as a seating portion seated on the flange portion of the joint body, and the outer peripheral surface of the insulating member is the inner peripheral surface of the cap nut. It is the insulation coupling formed as a fitting part fitted in.

  The invention according to claim 4 is the insulating joint in which the insulating member includes a flange surrounding portion that covers an outer periphery of the flange portion of the joint body, and a distal end side of the outer periphery of the flange surrounding portion is inclined.

  According to a fifth aspect of the present invention, the insulating member includes a flange surrounding portion that covers an outer periphery of the flange portion of the joint body, and an axial direction from the end face of the flange portion of the joint body on the distal end side of the flange surrounding portion. It is an insulation joint which has a protrusion part which protrudes in this.

  The invention according to claim 6 is an insulating joint in which the insulating member is formed in a split ring shape.

Further, the invention according to claim 7 for achieving the other object is an insulating joint in which a dissimilar metal cap nut is attached to a flange portion at one end of a joint body via a ring-shaped insulating member capable of reducing the diameter. The insulating member is temporarily attached to the outer periphery of the flange portion of the joint body, and the cap nut is attached to the outer periphery of the joint body while the flange portion of the cap nut is in contact with the outer periphery of the insulating member. Move together with the insulating member to the center side, reduce the diameter of the insulating member abutting against the movement stop wall of the joint body by moving the cap nut, and fit the inner peripheral surface of the cap nut,
When the cap nut is reversely moved in the direction of coming out of the joint body, the cap nut is attached to the flange portion of the joint body via the insulating member without coming out of the joint body. .

  The invention according to claim 8 is the assembling method of the insulating joint in which the distal end side of the outer periphery of the insulating member is inclined.

  The invention according to claim 9 is an assembling method of an insulating joint in which the insulating member is formed in a split ring shape.

  As described above, according to the first aspect of the present invention, the flange forming surface of the flange portion of the joint body and the first flange contact surface of the insulating member in surface contact with the flange forming surface are inclined, and the bag Since the flange forming surface of the flange portion of the nut and the second flange contact surface of the insulating member that is in surface contact with the flange forming surface are inclined, for example, when the piping is connected by a cap nut, the piping moves. Even if the pulling force due to this acts on the insulating member, the pulling force is distributed along the inclination, so that it is possible to withstand the pulling force without using a metal material.

  According to the invention which concerns on Claim 2, since an insulating member is provided with a flange surrounding part and an extension part, between a coupling main body and a cap nut can be insulated reliably.

  According to the invention of claim 3, since the insulating member fitted to the cap nut is seated on the flange portion of the joint body, the cap nut is not rattled and eccentric with respect to the joint body. Since it is aligned coaxially with the joint body, for example, when equipment such as piping is connected with a cap nut, the equipment such as piping can be securely attached coaxially with the joint body. Etc. can be connected well.

  According to the invention which concerns on Claim 4, when the front-end | tip part side of the outer periphery of the flange surrounding part of an insulating member is inclined, the flange part of a cap nut is moved on an insulating member, and an insulating member is diameter-reduced, and a cap nut When attaching an insulating member to the inner peripheral surface, the flange portion of the cap nut can be easily moved onto the insulating member, and the insulating member can be reliably reduced in diameter, so that the insulating member can be attached to the cap nut. Can be easily performed.

  According to the invention which concerns on Claim 5, since it has the protrusion part which has protruded from the end surface of the flange part of a joint main body at the front-end | tip part side of a flange surrounding part, it is provided with a water faucet via packing at the end surface of the flange part of a joint main body. When connecting a device such as a connecting portion or piping, the packing is difficult to move in the radial direction by the protruding portion, so that the connection between the joint body and the device can be performed with good sealing properties.

  According to the invention of claim 6, since the insulating member is formed in a split ring shape, it is easy to mount the insulating member and the stress acting in the circumferential direction escapes from the end portion, so that the durability of the insulating member is improved. improves.

  According to the invention of claim 7, the insulating member is temporarily attached to the flange portion at one end portion of the joint body, and the cap nut is moved to the center portion side on the outer periphery of the one end portion of the joint body. After the cap nut moves, the flange portion of the cap nut moves on the insulating member and the insulating member is reduced in diameter. Then, the insulating member is fitted to the inner peripheral surface of the cap nut, and the insulating member is attached to the cap nut. If this cap nut is moved in the direction of coming out of the flange portion of the joint body, the cap nut is seated on the flange portion of the joint body via the insulating member, so that the insulation joint can be easily assembled and the number of parts is reduced. Cost can be reduced.

  According to the invention of claim 8, the flange portion of the cap nut can be easily moved onto the insulating member, and the insulating member can be reliably reduced in diameter, so that the insulating member can be attached to the cap nut. It can be done easily.

  According to the ninth aspect of the invention, since the insulating member is formed in a split ring shape, it is easy to mount the insulating member, the diameter of the insulating member is easily reduced, and the stress acting in the circumferential direction is the end portion. As a result, the durability of the insulating member is improved.

  Hereinafter, an example of an insulating joint according to the present invention and a method for assembling the joint will be described in detail with reference to the accompanying drawings.

  1-7 is a figure which shows an example of the insulated joint which concerns on this invention. As shown in FIGS. 1 to 7, the insulated joint according to the present invention is configured to attach a cap nut 4 made of a different metal to a flange portion 3 at one end of a joint body 2 via a ring-shaped insulating member 6. The insulating member 6 has a split 6a. The insulation joint according to the present invention is not particularly limited, and is used for connection between an instrument such as a water faucet 10 or a water meter and piping, connection between piping, and the like. For example, a cap nut 4 at one end portion. And a pipe connection portion (not shown) for flexibly connecting the pipe to the other end. In addition, although the insulated joint 1 which concerns on this invention demonstrates the case where it uses for the connection of the water tap 10 and piping, it is not limited to this. 1 shows a state in which the upper half of the figure is in the state where the cap nut 4 is seated on the flange portion 3 of the joint body 2, and the lower half shows the end of the extended portion 66 of the insulating member 6 on the movement stop wall 27. It is a figure which shows the state which contact | abuts.

  The joint body 2 is made of, for example, stainless steel and is formed in a substantially cylindrical shape. The joint body 2 has three stages including a first body portion 21 on the one end side with the smallest diameter, a second body portion 22 on the center side, and a third body portion 23 on the other end side with the largest diameter. Is formed. A thread groove is provided on the outer periphery of the third barrel portion 23 of the joint body 2, and a flexible portion or the like for flexibly connecting a pipe or the like is attached to the other end portion of the third barrel portion 23. It is supposed to be. Moreover, the outer periphery 22a of the 2nd trunk | drum 22 by the side of the 1st trunk | drum 21 is formed in hexagonal or octagonal shape etc., for example, and it becomes possible to fix and hold the joint main body 2 (insulating joint) using a tool etc. now. ing.

A flange portion 3 that extends radially outward is provided at the distal end portion of the first body portion 21 (one end portion of the joint body 2). Of the two flange forming surfaces forming the flange portion 3, the flange forming surface 31 opposite to the end surface side is formed to be inclined with respect to the radial direction. That is, the flange forming surface 31 is formed at an acute angle with respect to the axial direction of the joint body 2 as indicated by θ ₁ in FIG.

  Further, the outer periphery of the first body portion 21 on the second body portion 22 side from the flange portion 3 is formed as a cap nut moving recess 25 that allows the cap nut 4 to move in the axial direction. An insulating member reduced-diameter concave portion 26 that allows the insulating member 6 to be reduced in diameter is provided on the second body portion 22 side of the cap nut moving concave portion 25. A wall surface (sometimes referred to as a movement stop wall 27) on the second body portion 22 side that forms the insulating member diameter-reduced recess 26 is inclined. That is, the outer periphery of the first body portion 21 is formed in three stages including the flange portion 3, the cap nut moving recess 25, and the insulating member reduced diameter recess 26, including the outer periphery of the flange portion 3. The axial length between the flange 3 of the cap nut moving recess 25 and the insulating member reduced diameter recess 26 is, for example, the thickness of the tip of the flange 5 of the cap nut 4 (the length in the axial direction). Preferably, they are formed with substantially the same dimensions.

The cap nut 4 is made of bronze, and has a flange portion 5 extending radially inward on the inner peripheral surface of one end portion. The inner diameter of the flange portion 5 is larger than the outer diameter of the flange portion 3 of the joint body 2, and is preferably formed with a slightly larger dimension, for example. A screw groove is formed on the inner periphery from the substantially central portion of the cap nut 4 to the other end portion, and is formed as a screw portion 42, which can be attached to a connection portion 11 such as a water faucet 10 or a device such as a pipe. It has become. An insulating member fitting recess 43 into which the outer periphery of the insulating member 6 is fitted is provided between the flange portion 5 on the inner periphery of the cap nut 4 and the screw portion 42. The wall surface of the insulating member fitting recess 43 on the flange portion 5 side, that is, the flange forming surface 51 forming the flange portion 5 is inclined at an acute angle as indicated by θ _{2 in} FIG. Further, the wall surface 44 on the opposite side to the flange forming surface 51 of the insulating member fitting recess 43 is inclined.

The insulating member 6 is for insulating the joint body 2 and the cap nut 4. The insulating member 6 is made of, for example, an elastic synthetic resin. The insulating member 6 is preferably formed so as to be capable of reducing the diameter, and may be formed in any manner as long as it is formed so as to be capable of reducing the diameter. For example, the insulating member 6 is formed in a split ring shape or the like. As shown in FIGS. 1 to 7, the insulating member 6 is provided between the flange portion 3 of the joint body 2 and the flange portion 5 of the cap nut 4 to prevent the cap nut 4 from coming out from the joint body 2. A prevention unit 61 is provided. The first flange contact surface 62 that comes into contact with the flange forming surface 31 of the flange portion 3 of the joint body 2 of the pull-out preventing portion 61 is formed to be inclined by an angle θ ₁ in FIG. Has been. Further, the second flange contact surface 63 that comes into contact with the flange forming surface 51 of the flange portion 5 of the cap nut 4 of the pull-out preventing portion 61 is inclined at an angle of θ ₂ in FIG. Is formed.

Here, the inclination angle theta ₁ of the flange forming surface 31 of the joint body 2 _(i.e., the inclination angle theta ₁ of the first flange contact surface 62 of the insulating member _6), or the angle of inclination of the flange forming surface 51 of the cap nut 4 theta ₂ (that is, the inclination angle θ ₂ of the second flange contact surface 63 in the insulating member 6) is assumed to be 90 °, a pulling force is applied to the joint body 2 and the cap nut 4 connected via the insulating member 6. In this case, the pulling force F applied to the insulating member 6 in the axial direction all acts as a shearing force on the insulating member 6.

On the other hand, when the inclination angles θ ₁ and θ ₂ are set to be less than 90 °, for example, 80 ° or less, as shown in the example of the first flange contact surface 62 in FIG. The applied pulling force F is decomposed into a component force F1 parallel to the inclined surface and a component force F2 perpendicular to the inclined surface. Therefore, shearing force applied to the first flange contact surface 62 becomes smaller than F, F2 = Fsinθ from being reduced to _1, the insulating member 6 with a POM (polyacetal) or resin such as PPS, the pull-out force It can be tolerable.

If the inclination angles θ ₁ and θ ₂ are set to less than 45 °, the component force F1 parallel to the inclined surface becomes larger than the component force F2 perpendicular to the inclined surface, and the flange forming surface 31 in the joint body 2 is obtained. And the flange forming surface 51 of the cap nut 41 is likely to be detached from the insulating member 6, so that θ ₁ and θ ₂ are preferably set to 45 ° to 80 °. For example, in the case of the insulating member 6 made of POM Is set to 60 ° ± 10 °.

  Next, the insulating member 6 is preferably provided with a flange surrounding portion 65 that covers the outer periphery of the flange portion 3 of the joint body 2 and an extending portion 66 that extends toward the center of the joint body 2. The length of the extending portion 66 in the axial direction is not particularly limited as long as the joint body 2 and the cap nut 4 can be reliably insulated, but preferably, the flange portion 3 of the joint body 2 and the insulating member reduced-diameter recess 26 It is preferable that it is formed with the dimension substantially the same as the space | interval between them, ie, the thickness (axial length) of the front-end | tip part of the flange part 5 of the cap nut 4. When the cap nut 4 is attached to the joint body 2, the front end side of the outer periphery of the flange surrounding portion 65 is inclined so that the flange portion 5 of the cap nut 4 can easily move on the insulating member 6 as a tapered surface 65 a. Preferably it is formed. That is, the outer periphery of the insulating member 6 is formed in a convex shape from the tapered surface 65a to the second flange contact surface 63, and this convex portion is fitted in the insulating member fitting concave portion 43 of the cap nut 4. It has become. Moreover, it is preferable to form the front-end | tip part of the flange surrounding part 65 as the protrusion part 67 which protrudes in an axial direction from the end surface of the flange part 3 of the coupling main body 2, and to position the packing which contact | abuts to the flange part 3. FIG. The length of the projecting portion of the flange surrounding portion 65 is formed with a dimension capable of suppressing the movement of the packing 15 in the radial direction.

Here, the inclination angle θ ₃ of the tapered surface 65a of the insulating member 6 that contacts the wall surface 44 of the cap nut 4 is the reduced diameter of the insulating member 6 due to the flange portion 5 of the cap nut 4 contacting the tapered surface 65a. In order to make it easy, it is good to set to 20 degrees-45 degrees, and it is set to about 30 degrees in a present Example. When thus set theta ₃ to less than 20 °, the axial length of the insulating member 6 is increased, the cap nut 4 to accommodate this must be lengthened. On the other hand, if θ ₃ is set larger than 45 °, it is difficult to reduce the diameter of the insulating member 6.

  A gap a is provided between the inside of the flange surrounding portion 65 in the insulating member 6 and the outer periphery of the flange portion 3 in the joint body 2, and the inner periphery of the extending portion 66 in the insulating member 6. And the clearance gap b is provided between the outer periphery of the cap nut movement recessed part 25 in the coupling body 2 (refer FIG. 8). Accordingly, the cap nut 4 fitted with the insulating member 6 can move in the radial direction by the gaps a and b, and can be aligned along the flange forming surface 61 inclined in the joint body 2. Has been.

  Next, a case where the cap nut 4 is attached to the joint body 2 will be described. First, the insulating member 6 is abutted against the end surface of the flange portion 3 of the joint body 2 (see FIG. 5A), the both end portions of the insulating member 6 are expanded to expand the diameter, and the end surface of the flange portion 3 of the joint body 2 is expanded. An insulating member 6 is temporarily mounted on the outer periphery of the flange portion 3 (see FIG. 5B). The end surface of the flange portion 5 of the cap nut 4 is butted substantially coaxially with the end surface of the flange portion 3 of the joint body 2. The cap nut 4 is moved in the axial direction to the second body 22 side of the joint body 2. Then, first, the front end portion of the flange portion 5 of the cap nut 4 comes into contact with the flange surrounding portion 65 (tapered surface 65a) of the insulating member 6 (see FIG. 5C). The insulating member 6 is pressed by the cap nut 4 and moves together with the cap nut 4 to the second body portion 22 side of the joint body 2. Then, the end portion of the extending portion 66 of the insulating member 6 abuts against the movement stop wall 27 (see FIG. 5D), and the flange portion 5 of the cap nut 4 is a tapered surface of the flange surrounding portion 65 of the insulating member 6. While moving on 65a, a force acts in the direction of reducing the diameter of the insulating member 6 by the flange portion 5 of the cap nut 4, and the insulating member 6 enters the insulating member reduced-diameter recess 26 against the elastic force. The diameter is reduced (see FIG. 5E).

  The flange portion 5 of the cap nut 4 moves on the insulating member 6 from the tapered surface 65a. At this time, the diameter of the insulating member 6 is minimized (see FIG. 5F). The flange portion 5 of the cap nut 4 moves on the second flange contact surface 63 after moving on the insulating member 6. At this time, the insulating member 6 is gradually expanded in diameter by the elastic force to return to the original shape (see FIG. 5G), and the tip of the flange portion 5 of the cap nut 4 is placed on the extending portion 66. When moved, the insulating member 6 is expanded in diameter and fitted into the insulating member fitting recess 43 of the cap nut 4 (see FIG. 5 (h)), and the insulating member 6 is attached to the inner peripheral surface of the cap nut 4. Accordingly, since the insulating member 6 is fitted to the inner peripheral surface of the bag nut 4 simply by temporarily mounting the insulating member 6 on the flange portion 3 of the joint body 2 and moving the cap nut 4, the insulating member 6 is attached to the bag. It can be easily attached to the nut 4.

  When the cap nut 4 is reversely moved in the reverse direction (the direction in which it is pulled out from the flange portion 3 of the joint body 2), the insulating member 6 is seated on the outer periphery of the flange portion 3 of the joint body 2 (see FIG. 5 (i)). ), The insulating joint 1 is assembled. At this time, since the pull-out preventing portion 61 of the insulating member 6 is interposed between the flange portion 5 of the cap nut 4 and the flange portion 3 of the joint body 2, the cap nut 4 may come out of the flange portion 3 of the joint body 2. In addition, the joint body 2 and the cap nut 4 are insulated by the insulating member 6. Further, the cap nut 4 is movable in a range from a state in which the cap nut 4 is seated on the flange portion 3 of the joint body 2 to a state in which the end portion of the extending portion 66 of the insulating member 6 contacts the movement stop wall 27. Therefore, the insulation joint 1 can be easily assembled, and the number of parts is small and the cost can be reduced.

  Moreover, since the insulating member 6 is formed in a split ring shape, the insulating member 6 can be easily temporarily attached to the outer periphery of the flange portion 3, so that the insulating joint 1 can be assembled more easily. Can do.

  Further, since the tip end side of the outer periphery of the flange surrounding portion 65 of the insulating member 6 is inclined and formed as a tapered surface 65a, the flange portion 5 of the cap nut 4 can be reliably moved onto the insulating member 6. In addition, since the insulating member 6 can be reliably reduced in diameter, the cap nut 4 can be reduced in diameter smoothly, and the insulating joint 1 can be assembled more easily.

  Further, since the movement stop wall 27 is inclined, when the end portion of the extending portion 66 of the insulating member 6 comes into contact, the insulating member 6 is aligned coaxially with the joint body 2, so that the cap nut 4 The force of the flange portion 5 moving on the insulating member 6 to reduce the diameter of the insulating member 6 acts on the entire peripheral surface of the insulating member 6. As a result, the diameter of the insulating member 6 can be smoothly reduced, and the insulating joint 1 can be assembled more easily.

  Further, when the cap nut 4 is moved to the second body portion 22 side and the end portion of the extending portion 66 of the insulating member 6 comes into contact with the movement stop wall 27 (this state is called when the cap nut 4 is retracted). For example, the first body portion is formed so that the end surface of the cap nut 4 opposite to the flange portion 5 and the end surface of the flange surrounding portion 65 of the insulating member 6 are substantially on the same plane or close to each other. It is preferable that the axial length 21 and the axial length of the cap nut 4 are formed.

  If formed in this way, one end of the joint body 2 can be easily connected to the connecting portion 11 of the water faucet 10 via the cap nut 4, for example. That is, the cap nut 4 is retracted, and the end surface of the flange portion 3 of the joint body 2 is easily brought into contact with the end surface of the connection portion 11 of the water faucet 10 via the packing 15 in a substantially coaxial manner. After the contact, when the threaded portion of the cap nut 4 is screwed into the connecting portion 11 of the water faucet 10, the end surface of the flange portion 3 of the joint body 2 is brought into contact with the end surface of the connecting portion 11 of the water faucet 10. Therefore, it is easy to screw the cap nut 4 to the connection portion 11 of the water faucet 10.

  Further, when the end portion of the extending portion 66 of the insulating member 6 is brought into contact with the movement stop wall 27, the movement stop wall 27 is inclined, so that the insulating member 6 (cap nut 4) is coaxial with the joint body 2. Since the alignment is performed upward, the joint body 2 and, for example, the connection portion 11 of the water faucet 10 can be positioned coaxially. Further, when the cap nut 4 is screwed into the connecting portion 11 of the water faucet 10 and the connecting portion 11 of the water faucet 10 and one end portion of the joint body 2 are tightened and connected, the insulating member 6 is connected to the joint body 2. Since the cap nut 4 is coaxially aligned with the joint body 2 by being fitted to the outer periphery of the flange part 3, the connection part 11 of the water faucet 10 and the joint body 2 can be coaxially connected. Thus, there is no leakage or the like, and the connecting portion 11 of the water faucet 10 and the joint body 2 can be reliably connected.

  In addition, the cap nut 4 is loose with respect to the joint body 2 because the insulating member 6 fitted to the cap nut 4 is seated on the inclined flange forming surface 31 formed on the flange portion 3 of the joint body 2. Since it is not attached and is not eccentric and is coaxially aligned with the joint body 2, the connection part 11 and the joint body 2 are coaxially connected when the connection part 11 is connected by the cap nut 4. It can attach reliably and can connect the connection part 11 and the coupling main body 2 favorably.

  Further, the protrusion portion 67 that protrudes in the axial direction from the end face of the flange portion 3 of the joint body 2 is provided at the distal end portion of the flange surrounding portion 65, so that the connection portion 11 of the water faucet 10 is connected via the packing 15. When the gasket 15 is connected, the movement of the packing 15 in the radial direction is suppressed by the protruding portion 67 and the packing 15 is not displaced, so that the connection between the joint body 2 and the connecting portion 11 can be reliably sealed. .

  In this way, when the joint body 2 is connected to the connection portion 11 of the water faucet 10 by tightening the cap nut 4, the cap nut 4 (flange portion 5) insulates from the flange portion 3 of the joint body 2. A force (sometimes referred to as a pulling force) is applied to the member 6 in the direction of pulling out from the flange portion 3 of the joint body 2. The pull-out force is such that the flange forming surface 31 of the flange portion 3 of the joint body 2 and the first flange contact surface 62 of the pull-out preventing portion 61 of the insulating member 6 are inclined and are in surface contact with each other. Since the flange forming surface 51 of the flange portion 5 and the second flange contact surface 63 of the pull-out preventing portion 61 are inclined and are in surface contact with each other, the pulling force is distributed along these inclinations (see FIG. 8). As a result, the insulating member 6 can sufficiently form a material that can withstand a pulling force, for example, with a synthetic resin material even in a limited space between the joint body 2 and the cap nut 4. Therefore, the insulating member 6 can be formed without using an expensive metal material, and it is possible to prevent the joint body 2 and the cap nut 4 from being pulled out with a single member, and between the joint body 2 and the cap nut 4. Insulation can be achieved, and cost reduction can be achieved.

  In addition, the insulating member 6 includes the flange surrounding portion 65 and the extending portion 66, so that the joint body 2 and the cap nut 4 can be reliably insulated, and electrical corrosion due to a potential difference is reliably suppressed. can do. In addition, since a protruding portion 67 that protrudes in the axial direction from the end face of the flange portion 3 of the joint body 2 is provided at the distal end portion of the flange surrounding portion 65, the space between the joint body 2 and the cap nut 4 is further increased. Insulation can be ensured, and electrical corrosion due to a potential difference can be more reliably suppressed.

  The cap nut 4 is attached by temporarily mounting the insulating member 6 and moving the cap nut 4 in the axial direction so that the insulating member 6 is fitted to the cap nut 4 after the insulating member 6 is reduced in diameter. Therefore, if there is an insulating member 6 diameter-reducing recess for reducing the diameter of the insulating member 6, the cap nut 4 can be attached, and therefore the length of the first body portion 21 in the longitudinal direction can be shortened. That is, for example, the length of the first body portion 21 can be made shorter than the length of the cap nut 4, and the cap nut 4 is moved to the center portion side of the joint body 2 so that the joint body 2 is moved from the cap nut 4. When the insulating member 6 is inserted by inserting the insulating member 6 between the protruding flange portion and the cap nut 4 by projecting the flange portion 3 (the length of the first body portion 21 is the cap nut 4 The length of the first body 21, that is, the joint body 2, can be shortened compared to the case where the length is longer than the length of the joint body 2, and the insulation joint 1 can be made compact.

  FIG. 8 shows another example of the insulating member 6. Unlike the split ring shown in FIG. 6, the slit 68 is provided alternately on both ends of the joint main body 2 and the cap nut 4, and the structure can be expanded and contracted similarly to the split ring. In this case, a plurality of slits 68 are alternately formed in the annular portion of the holding member 6 at equal intervals.

It is sectional drawing which shows an example of the principal part of the insulated joint which concerns on this invention. It is a disassembled perspective view which shows an example of the insulated joint which concerns on this invention. It is a decomposition | disassembly partial sectional view which shows an example of the insulated joint which concerns on this invention. It is a partial sectional view showing an example which connected the insulated joint concerning the present invention to the water faucet. It is a figure which shows an example of the insulation coupling assembly method which concerns on this invention. It is a figure which shows an example of the insulating member which concerns on this invention, (a) is a top view, (b) is a side view, (c) is sectional drawing. It is the elements on larger scale of an insulation joint. It is a figure which shows the other example of an insulating member, (a) is a partially notched cross-sectional view, (b) is a top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insulation joint 2 Joint main body 3 Flange part 4 Cap nut 5 Flange part 6 Insulation member 10 Water faucet 11 Connection part 15 Packing 25 Nut movement recessed part 26 Insulation member reduced diameter recessed part 27 Movement stop wall 31 Flange formation surface 51 Flange formation surface 61 Pull-out prevention portion 62 First flange contact surface 63 Second flange contact surface 65 Flange surrounding portion 66 Extension portion 67 Projection portion

Claims (9)

  An insulating joint in which a dissimilar metal cap nut is attached to a flange portion at one end of a joint body via a ring-shaped insulating member, wherein the insulating member includes a flange portion of the joint body and a flange portion of the cap nut. A flange-preventing portion provided between the flange main body and preventing the cap nut from coming out of the joint main body; and a flange forming surface on which the pull-out preventive portion contacts the flange portion of the joint main body; Inclining the first flange contact surface of the pull-out preventing portion so that the pull-out preventing portion comes into surface contact with the forming surface, while tilting the flange forming surface with which the pull-out preventing portion contacts the flange portion of the cap nut, An insulating joint, wherein a second flange contact surface of the pull-out preventing portion is inclined so that the pull-out preventing portion comes into surface contact with a flange forming surface.   The insulating joint according to claim 1, wherein the insulating member includes a flange surrounding portion that covers an outer periphery of a flange portion of the joint main body, and an extending portion that extends toward a central portion of the joint main body.   The inner peripheral surface of the insulating member is formed as a seating portion that sits on the flange portion of the joint body, and the outer peripheral surface of the insulating member is a fitting portion that fits the inner peripheral surface of the cap nut. The insulating joint according to claim 1 or 2, which is formed.   The insulation according to any one of claims 1 to 3, wherein the insulating member includes a flange surrounding portion that covers an outer periphery of the flange portion of the joint body, and a tip end side of the outer periphery of the flange surrounding portion is inclined. Fittings.   The said insulation member is provided with the flange surrounding part which covers the outer periphery of the flange part of the said joint main body, and has the protrusion part which protrudes in the axial direction from the end surface of the flange part of the said joint main body at the front-end | tip part side of this flange surrounding part. Item 5. The insulated joint according to any one of Items 1 to 4.   The insulating joint according to claim 1, wherein the insulating member is formed in a split ring shape. A method for assembling an insulating joint, wherein a dissimilar metal cap nut is attached to a flange portion at one end of the joint body via a ring-shaped insulating member capable of reducing the diameter, and the insulating member is disposed on an outer periphery of the flange portion of the joint body Is temporarily mounted, and the flange portion of the cap nut is brought into contact with the outer periphery of the insulating member, the cap nut is moved together with the insulating member toward the center portion of the joint body, and is brought into contact with the movement stop wall of the joint body. The insulation member is reduced in diameter by the movement of the cap nut, and fitted to the inner peripheral surface of the cap nut,
When the cap nut is reversely moved in the direction of exiting from the joint body, the cap nut is seated on the flange portion of the joint body via the insulating member without coming out of the joint body. Assembly method.   The method for assembling the insulating joint according to claim 7, wherein a distal end side of the outer periphery of the insulating member is inclined.   The method for assembling an insulating joint according to claim 7 or 8, wherein the insulating member is formed in a split ring shape.

Images