JP2020041631A - Pipe joint - Google Patents

Abstract

To provide a pipe joint which allows for easily and securely connecting resin hoses including a metal layer.SOLUTION: A pipe joint 1 has a body 2, a nut 3, a retainer 4, and an insulation member 5. The insulation member 5 has an insulation body 51 which moves along a nipple part 21 of a resin hose while being pushed into the nipple part, and an indicator part 52 which, in cooperation with the movement of the insulation body, allows for visualizing a completion of the pushing of the resin hose from the outside of the body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint to which a resin hose having a metal layer is connected.

  Conventionally, a resin hose such as a reinforced rubber hose for gas described in Non-Patent Document 1 has been used for coupling between a gas stopper and a gas combustion device. Some reinforced rubber hoses for gas have a plurality of synthetic rubber layers and a metal layer provided between the synthetic rubber layers. Since the synthetic rubber layer is reinforced by the metal layer, this kind of reinforced rubber hose for gas has excellent deformation resistance against deformation such that the flow path is crushed like bending. The metal layer is formed by braiding a thin steel wire, for example.

  Patent Literature 1 discloses a pipe joint 10 having a structure shown in FIG. 12 as a pipe joint for connecting the above resin hose, a gas stopper, and each combustion device. The pipe joint 10 includes a main body 20 having a nipple portion 201 to which the resin hose H is fitted, a nut 30 screwed into the main body 20, a retainer 40 for holding the resin hose H, and an end of the resin hose H which is cut. It has an insulating member 50 for insulating the exposed metal layer ML and the main body 20. The nipple portion 201 has a plurality of protrusions having a sawtooth-shaped longitudinal section including an axis formed on its surface, and has an outer diameter larger than the inner diameter of the resin hose H. According to the pipe joint 10, the pipe joint 10 and the resin hose H are connected as follows. First, the resin hose H is passed through the nut 30 and the retainer 40 on the inner diameter side in a state removed from the main body 20. Next, the resin hose H is pushed into the main body 20 until the distal end abuts on the insulating member 50. After visually confirming that the end of the resin hose H has reached the insulating member 50, the nut 30 is assembled to the main body 20, and the nut 30 is tightened to the main body 20, so that the pipe joint 10 and the resin hose are connected.

  According to the pipe joint 10, since the metal layer ML and the main body 20 are insulated by the insulating member 50, a battery is not formed between the metal layer ML and the main body 20 due to a potential difference, and corrosion caused by the potential difference is prevented. Can be prevented.

  While the resin hose H having the metal layer ML has excellent deformation resistance, the inner diameter does not easily expand due to its high strength. Therefore, when the resin hose H is pushed into the pipe joint 10, a large resistance is received between the resin hose H and the nipple portion 201. Therefore, the operator cannot accurately distinguish the resistance during the pushing of the resin hose H from the resistance at the time of completion of the pushing, and it is difficult to accurately determine the completion of the pushing into the main body 20 only by touch. Therefore, in the pipe joint 10, the step of pushing the resin hose H into the main body 20 and the step of assembling the nut 30 to the main body 20 are separated. It has been confirmed directly and visually that the end of has reached the pushing completion position.

JP-A-2-38592

Ministry of Economy, Trade and Industry, Japan Industrial Standards Committee, "Japan Industrial Standards JIS K 63515 Gas Reinforced Rubber Hose and Hose Assembly", Japan Standards Association, March 25, 2006

  However, removing the nut and the retainer from the main body when pushing the resin hose into the main body is complicated and inefficient. Also, removing the retainer from the main body may lead to loss of the retainer or forgetting to attach the retainer. If the installation is performed without the retainer, the connection between the pipe joint and the resin hose may be disconnected after the installation. The present invention has been made in view of the above problems, and has as its object to provide a pipe joint that can easily and reliably connect a resin hose having a metal layer.

In order to achieve the above object, a pipe joint according to the present invention has a metal body having a nipple portion to which a resin hose having a metal layer is fitted, a nut screwed into the body, and a nut tightened to the body. By pressing the inner surface of the resin hose against the outer surface of the nipple portion by holding the resin hose, a retainer that holds the resin hose, and an insulating member that is attached to the main body and insulates between the metal layer and the main body when the resin hose is connected, In a fitting having
The insulating member consists of an insulating body that moves along the nipple with the pushing of the resin hose into the nipple, and an indicator that allows the completion of the pushing of the resin hose to be viewed from outside the body in conjunction with the movement of the insulating body. It is characterized by having.

  According to the pipe joint according to the present invention, the insulating member is configured to move from the outside of the main body of the resin hose to the completion of the pushing of the resin hose in conjunction with the movement of the insulating main body part and the movement of the insulating main body part when the resin hose is pushed into the pipe joint. Since it has a visible indicator, it is possible to confirm that the resin hose has been completely pushed in without disassembling the main body and the nut. Further, since the main body and the nut do not have to be disassembled when the resin hose is pushed in, there is no need to forget to attach the retainer. Thus, according to the pipe joint according to the present invention, the resin hose having the metal layer can be easily and reliably connected.

It is sectional drawing which shows the state before the resin hose is pushed in of the pipe joint which concerns on 1st Embodiment. It is a sectional view showing the state where the resin hose was pushed in of the pipe joint concerning a 1st embodiment. It is a sectional view showing the state where a main part and a nut of a pipe joint concerning a 1st embodiment were tightened. FIG. 3 is a perspective view of the insulating member according to the first embodiment. It is sectional drawing which shows the state before the resin hose is pushed in of the pipe joint which concerns on 2nd Embodiment. It is a sectional view showing the state where the resin hose was pushed in of the pipe joint concerning a 2nd embodiment. It is a perspective view of an insulating member concerning a 2nd embodiment. It is a perspective view of other insulating members concerning a 2nd embodiment. It is sectional drawing which shows the state before the resin hose is pushed in of the pipe joint which concerns on 3rd Embodiment. It is a sectional view showing the state where the resin hose was pushed in of the pipe joint concerning a 3rd embodiment. It is a perspective view of an insulating member concerning a 3rd embodiment. It is sectional drawing which shows the pipe joint of a prior art.

  The details of the present invention will be described with reference to the drawings. The embodiment described here is merely an example, and the present invention is not limited to this.

(First Embodiment)
FIGS. 1, 2 and 3 are sectional views showing a longitudinal section including an axis of the pipe joint according to the first embodiment of the present invention. FIG. 1 shows a state before the resin hose is pushed into the pipe joint, and FIG. 2 shows a state where the resin hose is pushed into the pipe joint by a predetermined amount. Here, the predetermined amount is a pushing amount determined at the pipe joint to complete the pushing of the resin hose. FIG. 3 shows a state in which the connection between the resin hose and the pipe joint has been completed. FIG. 4 is a perspective view showing the insulating member according to the first embodiment of the present invention.

  The pipe joint 1 has a main body 2, a nut 3, a retainer 4, and an insulating member 5.

  The main body 2 has a nipple portion 21. The nipple portion 21 has a protrusion 211 having a sawtooth-shaped longitudinal section including an axis formed on an outer surface thereof, so that a resin hose H having a metal layer ML is fitted to the outside. The nipple portion 21 is provided so that its maximum outer diameter is at least larger than the inner diameter of the resin hose to be connected, and when the resin hose H is externally fitted, the protrusion 211 bites into the inner surface of the resin hose H. This prevents the resin hose H from falling off. Further, at least a part of the outer surface of the nipple portion 21 is in close contact with the inner surface of the resin hose H over the entire circumference in the circumferential direction, thereby sealing the inner surface of the resin hose.

  The nipple portion 21 preferably has a lubrication layer (not shown) formed on the surface. Since the resin hose H is reinforced by the metal layer ML, the inner diameter is not easily expanded, so that when the resin hose H is pushed into the pipe joint, it receives a large resistance due to friction with the nipple portion 21. By forming the lubricating layer on the surface of the nipple portion 21, the friction between the resin hose H and the nipple portion 21 at the time of pushing is suppressed, and the resistance received when the resin hose H is pushed into the pipe joint 1 is reduced. The lubricating layer can be formed, for example, by applying a lubricating paint in which a microcapsule in which a core material containing a lubricant is surrounded by a film material and a binder are kneaded. The lubricating paint containing microcapsules is applied to the nipple portion 21 in a state in which a lubricant such as silicon oil is enclosed in the microcapsules, and then dried to form a lubricating layer on the surface of the nipple portion 21. be able to. In the thus formed lubricating layer, the lubricant is confined in the microcapsule until the resin hose H is pushed into the nipple portion 21, and a dry state is maintained on the surface of the nipple portion 21. . Therefore, it is preferable to apply the lubricant directly to the nipple portion 21 because adhesion of foreign substances such as dust to the surface of the nipple portion 21 is suppressed.

  The main body 2 has a connection screw portion 22 for connection to a connection port (not shown) of a gas cock or a gas combustion device. The connection screw portion 22 is formed at the end of the main body 2 opposite to the nipple portion 21 via a body portion 23, and is turned into a connection port (not shown) by turning the body portion 23 with a tool such as a spanner. . The outer shape of the body 23 is formed in a polygonal shape such as a hexagon in order to hang a tool.

  The main body 2 has a cylindrical portion 24 protruding from the body portion 23 toward the nipple portion 21 along the axis. The male part 241 to which the nut 3 is attached is formed in the cylindrical part 24. The main body 2 has a cutout portion 25 in at least a part of the body portion 23 and the cylindrical portion 24 in the circumferential direction. The cutout portion 25 is cutout from the end on the nipple portion side of the tubular portion 24 toward the connection screw portion 22 along the axis. An insulating member 5 described later is movably mounted between the tubular portion 24 and the nipple portion 21 when the resin hose H is pushed in, and the notch 25 accommodates an indicator 52 provided on the insulating member 5.

  The nut 3 has a large diameter portion 31, a small diameter portion 32, and a nut taper portion 33. The large diameter portion 31 has an inner diameter dimension capable of accommodating a retainer 4 described later, and is formed on the nut 3 on the side of the main body 2. A female screw 311 is formed in the large diameter portion 31. The nut 3 can be assembled to the main body 2 by screwing the female screw 311 into the male screw 241. The small diameter portion 32 is formed so as to have an inner diameter dimension through which the resin hose H can be inserted. The nut taper portion 33 connects the inner surface of the small-diameter portion 31 and the inner surface of the large-diameter portion 32 and is formed so that the inner diameter increases from the small-diameter portion 31 toward the large-diameter portion 32.

  The retainer 4 holds the resin hose H by pressing the inner surface of the resin hose H against the outer surface of the nipple portion 21 by tightening the nut 3 on the main body 2. The retainer 4 is formed so as to have an inner diameter dimension through which the resin hose H can be inserted, and has a C-shaped cross-sectional shape in which a part in the circumferential direction is cut. The retainer 4 has a retainer taper portion 41 on the outer periphery of the end opposite to the main body 2. The retainer 4 has a saw blade shape in a longitudinal section including an axis, and a retainer projection 42 is formed on an inner surface.

  The insulating member 5 is attached to the main body 2 and insulates the metal layer ML from the main body 2 when the resin hose H is connected.

  The insulating member 5 has an insulating main body 51 and an indicator 52. The insulating main body 51 is formed of, for example, a synthetic resin-based or rubber-based insulating material, and is interposed between the main body 2 and the metal layer ML when the resin hose H is connected to the pipe joint 1. , The pipe joint 1 and the metal layer ML are insulated. The insulating body 51 is an annular plate having a hole through which the nipple can be inserted.

  The indicator section 52 is provided so that the completion of the pushing of the resin hose H can be visually recognized from the outside of the main body 2 in conjunction with the movement of the insulating main body section 51. The indicator 52 is formed so as to protrude from the insulating main body 51 along the axis toward the back side of the main body 2.

  The insulating member 5 is assembled to the main body 2 with an insulating main body 51 fitted on the outer periphery of the nipple 21. When the resin hose H is pushed into the nipple portion 21, the insulating member 5 is assembled at a position where the insulating member 5 can be pushed along the axis by being pushed toward the back side of the main body 2 by the end of the resin hose H, and In the pipe joint 1 according to the embodiment, the insulating main body portion 51 is attached to the end portion inner diameter side of the tubular portion 24. The insulating member 5 is positioned in the circumferential direction with the guide projection 53 fitted into the notch 25 of the main body 2, and the insulating main body 51 is pushed into the resin hose H and the indicator 52 is inserted into the notch 25. You can move along.

  As shown in FIGS. 1 and 2, in the pipe joint 1, the distal end T of the indicator portion 52 is located on the inner side of the notch 25 before the resin hose H is pushed into the nipple portion 21 until the pushing is completed. It does not hit against the end, but hits when a predetermined amount of pushing is completed. According to the pipe joint 1, it is possible to confirm from the outside of the pipe joint 1 whether or not the tip T of the indicator 52 abuts on the end on the far side of the notch 25, so that the resin hose H is pushed into the pipe joint 1. Completion is visible from outside the fitting 1. Further, a colored portion may be provided by coloring the bottom surface 251 of the notch portion 25 viewed from the outside of the pipe joint with, for example, paint. By providing the colored portion with an easily visible color, it is possible to easily determine whether or not the colored portion is completely hidden by the indicator portion 52, so that the visibility of the completion of the pushing of the resin hose H into the pipe joint 1 is improved. .

  As described above, according to the pipe joint 1, the completion of the pushing of the resin hose H into the main body 2 is confirmed, and then the nut 3 is connected to the main body 2 until the end face 34 abuts against the body 23 as shown in FIG. Screwed against. At this time, the diameter of the retainer 4 is reduced by the retainer taper portion 41 being pushed in the inner diameter direction by the nut taper portion 33, and the resin hose H is pressed against the nipple portion 21. The resin hose H is prevented from coming off with respect to the main body 2 by being bitten by the retainer protrusion 41 on the outer surface and the protrusion 211 on the inner surface, and is firmly held.

(Second embodiment)
5 and 6 are cross-sectional views showing a longitudinal section including an axis of a pipe joint according to a second embodiment of the present invention. FIG. 5 shows a state before the resin hose is pushed into the pipe joint, and FIG. 6 shows a state where the resin hose is pushed into the pipe joint by a predetermined amount. FIG. 7 is a perspective view showing an insulating member according to the second embodiment of the present invention. FIG. 8 is a perspective view showing another insulating member according to the second embodiment of the present invention. In the pipe joint according to the second embodiment, the structure excluding the indicator part of the insulating member is the same as that of the pipe joint according to the first embodiment, and thus the same reference numerals are given and the description is omitted. I do.

  The pipe joint 1a has a main body 2, a nut 3, a retainer 4, and an insulating member 5a.

  The insulating member 5a is attached to the main body 2, and insulates between the metal layer ML and the main body 2 when the resin hose H is connected.

  In the insulating member 5a, the indicator portion 52a has a plate shape and is formed so as to protrude from the insulating main body portion 51 toward the back side of the main body 2 along the axis. The indicator section 52a has a shape in which a vertical cross section along the axis is bent in a V-shape. It has a second plate portion 522a that is locked to the portion, and a bent portion 523a that connects the first plate portion 521a and the second plate portion 522a.

  The indicator 52a is deformable with the base Ra and the tip Ta of the insulating body 51 as fulcrums. In the pipe joint 1a according to the second embodiment, the tip corresponds to the locking portion in the present invention. The indicator portion 52a can be deformed along the cutout portion 25 while the insulating main body portion 51 is pushed into the resin hose H.

  Specifically, the indicator 52a is deformed as follows. When the resin hose H is pushed into the pipe joint 1 a, the insulating main body 51 is pushed toward the inner side of the main body 2 by the end of the resin hose H. At this time, the indicator portion 52a is compressed between the insulating body portion 51 and the rear end of the notch 25 because the front end Ta is locked to the rear end of the notch 25. . By being compressed, the indicator portion 52a is further bent at the bent portion 523a, and when the resin hose H is pushed into the pipe joint 1a by a predetermined amount, the bent portion 523a projects outside the main body 2 as shown in FIG. I do. According to the pipe joint 1a, the completion of the pushing of the resin hose H into the pipe joint 1a can be visually recognized from the outside of the pipe joint 1a by checking whether the bent portion 523a protrudes outside the main body 2. Further, since the indicator 52a can be easily deformed by the bent portion 523a, an excessive force is not required to operate the indicator 52a, and the pushing force of the resin hose is increased to operate the indicator. Can be suppressed.

Further, the insulating member according to the second embodiment may be the insulating member 5a 'shown in FIG.
In the insulating member 5a ', the indicator portion 52a' is formed so as to protrude from the insulating main body portion 51 along the axis toward the back side of the main body 2, and has a vertical section along the axis having an arc shape.

(Third embodiment)
FIGS. 9 and 10 are cross-sectional views showing a vertical cross section including an axis of a pipe joint according to a third embodiment of the present invention. FIG. 9 shows a state before the resin hose is pushed into the pipe joint, and FIG. 10 shows a state where the resin hose is pushed into the pipe joint by a predetermined amount. FIG. 11 is a perspective view showing an insulating member according to the third embodiment of the present invention. In the pipe joint according to the third embodiment, the structure excluding the indicator part of the insulating member is the same as the structure of the pipe joint 1a shown in FIG. 5 and FIG. Is omitted.

  The pipe joint 1b has a main body 2, a nut 3, a retainer 4, and an insulating member 5b.

  The insulating member 5b is attached to the main body 2 and insulates between the metal layer ML and the main body 2 when the resin hose H is connected.

  In the insulating member 5b, the indicator part 52b has a first plate part 521b protruding from the insulating main body part 51 and a front end Tb at an inner end of the notch part 25, similarly to the insulating member 5a shown in FIG. It has a second plate portion 522b to be locked, and a bent portion 523b connecting the first plate portion 521b and the second plate portion 522b.

  In the pipe joint 1b, when the resin hose H is pushed into the pipe joint 1b, the point that the indicator portion 52b is bent at the bent portion 523b is the same as the pipe joint 1a according to the second embodiment. According to the pipe joint 1b, when the resin hose H is pushed into the pipe joint 1b by a predetermined amount, the outer surface of the second plate portion 522b comes into close contact with the inner surface of the notch portion 25b, so that the main body 2 is closed. Invisible from outside. Thus, according to the pipe joint 1b, if the second plate portion 522b of the indicator portion 52b is not visible from the outside of the main body 2, it is determined that the pushing of the resin hose H into the pipe joint 1b is completed. can do. Whether or not the second plate portion and the inner surface of the notch portion 25b are in close contact with each other can be visually recognized from outside the pipe joint 1b.

  The present invention is not limited to the above-described embodiment, and can be modified without departing from the gist thereof. For example, the technical features of the pipe joints according to the first embodiment, the second embodiment, and the third embodiment may be used to solve some or all of the problems of the present invention, or as described above. In order to achieve some or all of the effects described above, replacement or combination may be appropriately performed.

1, 1a, 1b: pipe joint 2: body 21: nipple part, 211: protrusion, 22: connection screw part, 23: trunk part, 24: cylindrical part, 241: male screw part, 25: notch part, 251 : Bottom 3: Nut 31: Large diameter part, 311: Female thread part, 32: Small diameter part, 33: Nut taper part, 34: End face 4: Retainer 41: Retainer taper part, 42: Retainer projection 5, 5a, 5b: Insulating member 51: insulating body, 52, 52a, 52a'52b: indicator, 521a, 521b: first plate, 522a, 522b: second plate, 53: guide protrusion H: resin hose ML: metal layer

Claims (8)

A metal body having a nipple portion to which a resin hose having a metal layer is fitted,
A nut screwed into the body,
A retainer for holding the resin hose by pressing the inner surface of the resin hose against the outer surface of the nipple portion by tightening the nut on the main body,
An insulating member attached to the main body and insulating between the metal layer and the main body when the resin hose is connected,
The insulating member is configured to move along the nipple portion together with the pushing of the resin hose into the nipple portion, and in conjunction with the movement of the insulating body portion, the completion of the pushing of the resin hose to the main body. Characterized by having an indicator part that can be seen from the outside,
Pipe fittings. The indicator section includes:
It is formed so as to protrude from the insulating main body portion toward the back along the axis of the main body,
The pipe joint according to claim 1. The indicator section includes:
Formed in a plate shape,
At least a portion has a locking portion that is locked to the main body,
Deformable with the root of the insulating body and the locking part as a fulcrum,
The pipe joint according to claim 2. The indicator section includes:
When the pushing of the resin hose is completed, at least a part protrudes outside the main body,
The pipe joint according to claim 3. The indicator section includes:
A first plate portion protruding from the insulating body portion;
A second plate portion having a locking portion for locking at least a part of the main body;
A bending portion that connects the first plate portion and the second plate portion and that bends in conjunction with movement of the insulating body portion;
The pipe joint according to claim 3. The second plate portion includes:
When the pushing of the resin hose is completed,
The outer surface is in close contact with at least a part of the main body,
The pipe joint according to claim 5. The nipple portion has a lubrication layer formed on the surface,
The pipe joint according to any one of claims 1 to 6. The lubrication layer,
A core material containing a lubricant is formed by applying a lubricating paint kneaded with a microcapsule and a binder surrounded by a film material,
The pipe joint according to claim 7.

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