JP7133737B1 - Electric fusion joint integrated rotary joint, unit piping and unit piping construction method - Google Patents

Abstract

A rotary joint integrated with an electric fusion joint, a unit pipe, and a unit that can suppress the occurrence of wear and scraping due to the rotation of a snap-engaged portion while ensuring the rotation of a portion that is connected to an instrument, and that can reduce the number of assembly steps. Provide plumbing method. A rotary joint integrated with an electric fusion joint (100) includes a main body (2) made of resin having an electric fusion joint (21) for electro-fusion of the end of a resin pipe (1), and snap engagement with the outer peripheral surface of the main body (2). a metal annular member 4 having an inner peripheral surface that extends to the center of the annular member 4, one end 61 that engages with the annular member 4 so as to be rotatable about the axis CL and movement in the direction of the axis CL is restricted, and an instrument and a metal shell 6 having the other end 62 that connects with. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to an electric fusion joint integrated rotary joint, unit piping, and a unit piping construction method.

Indoor water and hot water supply pipes are connected by resin pipes from the water meter to the faucets at the ends of the kitchen, wash basin, toilet, and the like. Such water supply and hot water supply piping includes water supply systems such as a branched system and a header system, and various joints are used in each water supply system.

In addition to screw (mechanical) joints that use tools such as wrenches, and pipe insertion (one-touch) joints that do not require tightening tools, resin pipes can be joined together by energizing an electric wire to connect the outer surface of the resin pipe and the inner surface of the joint. There is an electric fusion joint that fuses and integrates. Electrofusion joints are joined by melting and integrating the inner surface of the joint made of resin such as polyethylene and the outer surface of the resin pipe by using a dedicated controller, resulting in stable joining that does not depend on the skill of the operator. can be expected. On the other hand, in threaded joints and pipe-insertion joints, the joint quality depends on the skill of the operator.

On the other hand, in factories, joints are electrically fused to ends of resin pipes to produce unit pipes. By manufacturing the unit piping in advance at the factory, the number of connection points on site can be reduced to only the connection points between the faucet and the joint, which has the advantage of reducing the risk of water leakage. However, in this case, if an electrofusion joint that does not rotate at the part that connects to the water faucet is connected to the end of the resin pipe in advance at the factory, the joint and the resin pipe will be integrated and will not rotate with each other. Therefore, there is a risk that a situation may arise in which the connection between the unit piping and the faucet fixture cannot be made on site.

In order to solve this problem, Japanese Patent Application Laid-Open Nos. 2019-23497 (Patent Document 1) and 2019-23507 (Patent Document 2) disclose electrofusion in which the portion connected to the water faucet is rotatable. Joint-integrated rotary joints have been proposed.

JP 2019-23497 A JP 2019-23507 A

In the electric fusion joint-integrated rotary joint described in Patent Documents 1 and 2, after snap-engaging the resin inner cylindrical portion with the outer cylindrical portion, the inner circumference of the inner cylindrical portion is expanded using a diameter expanding jig. A portion of the surface is enlarged. As a result, a portion of the in-core inserted into the inner cylindrical portion is not press-fitted into the inner surface of the inner cylindrical portion. Therefore, the inner core is prevented from hindering the elastic restoration of the inner tubular portion, and the outer tubular portion and the inner tubular portion can be relatively rotated with a prescribed small torque.

However, the electric fusion joint-integrated rotary joints described in Patent Documents 1 and 2 use a diameter expanding jig after snap-engaging the resin inner cylindrical portion with the outer cylindrical portion, so it takes a long time to assemble. need.
Further, if the hardness of the outer cylinder is made of metal and the hardness of the inner cylinder is different, the inner cylinder may come off due to wear or scraping due to rotation of the snap-engagement portion.

The present invention provides an electric fusion joint-integrated rotary joint, a unit piping, and an electric fusion joint-integrated rotary joint that can suppress the occurrence of wear and scraping due to the rotation of the snap-engagement portion while ensuring the rotation of the portion that connects to the instrument, and can reduce the number of assembly steps. An object of the present invention is to provide a unit piping construction method.

In order to solve the above-mentioned problems, an electric fusion joint-integrated rotary joint according to the present invention includes a resin main body having an electric fusion joint portion for electro-fusion of the end of a resin pipe, and an outer peripheral surface of the main body. A metallic annular member having an inner peripheral surface that snaps into engagement, one end engaged with the annular member so as to be rotatable about an axis and restricted from moving axially, and an instrument. a metal body having the other end to be connected , and a cylindrical metal inner core is press-fitted into the inner peripheral surface of the main body on the side opposite to the electric fusion joint, wherein the inner core A flange is formed at the barrel-side end of the barrel, and a stepped portion is formed on the inner peripheral surface of the barrel, and the flange is disposed between the stepped portion and the main body. It is characterized by

According to the present invention, it is possible to suppress the occurrence of wear and scraping due to the rotation of the portion to be snap-engaged while ensuring the rotation of the portion connected to the instrument, and the electric fusion joint integrated rotary joint and unit that can reduce the number of assembly steps. Piping and unit plumbing methods can be provided.

FIG. 2 is a diagram showing the configuration of an electric fusion joint-integrated rotary joint according to the present embodiment; FIG. 2 is a diagram showing the configuration of the snap ring shown in FIG. 1; FIG. 4 is a cross-sectional view for explaining the procedure for assembling the electric fusion joint-integrated rotary joint according to the present embodiment; FIG. 4 is a cross-sectional view for explaining the assembly procedure of the rotary joint integrated with an electric fusion joint according to the present embodiment, continuing from FIG. 3 ; FIG. 5 is a cross-sectional view for explaining the assembly procedure of the rotary joint integrated with the electric fusion joint according to the present embodiment, continuing from FIG. 4 ; FIG. 6 is a cross-sectional view for explaining the assembling procedure of the rotary joint integrated with the electric fusion joint according to the present embodiment, continuing from FIG. 5 ;

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the drawings shown below, common members and members of the same type are denoted by the same reference numerals, and overlapping descriptions are omitted as appropriate.

FIG. 1(a) is a partial cross-sectional side view showing the configuration of an electric fusion joint-integrated rotary joint 100 according to an embodiment of the present invention, and FIG. 1(b) is a resin pipe 1 side of FIG. 1(a). It is the figure seen from. 2(a) is a view of the snap ring 64 shown in FIG. 1(a) as seen from the direction of the axis line CL, and FIG. 2(b) is a sectional view taken along the line IIb-IIb of FIG. 2(a).
As shown in FIG. 1 , an electrofusion joint-integrated rotary joint 100 according to this embodiment includes a main body 2 , an annular member 4 , and a trunk 6 .

The main body 2 has a cylindrical shape and has an electric fusion joint portion 21 and a first engaging portion 31 . The electric fusion joint portion 21 is provided at the end portion of the main body 2 on the resin pipe 1 side. The electrofusion joint portion 21 has a base portion 22 , a bobbin 23 , projections 24 , terminals 25 and coils 26 . The base 22 has a cylindrical shape. The bobbin 23 is installed radially inside the base portion 22 and has a spiral groove formed on its outer peripheral surface. A pair of protrusions 24 are provided so as to protrude radially outward from the outer peripheral surface of the base portion 22 . The terminal 25 has a root portion embedded in the protrusion 24 and a tip portion extending radially outward from the tip of the protrusion 24 . The coil 26 is wound around the spiral groove of the bobbin 23 and generates heat when energized. Both ends of the coil 26 are connected to a pair of terminals 25 via electric wires (not shown).

The first engaging portion 31 is formed on the outer peripheral surface of the main body 2 and has a first convex portion 32 and a first concave portion 33 . The first engaging portion 31 is provided closer to the trunk 6 than the electric fusion joint portion 21 in the main body 2 . The main body 2 is made of resin such as crosslinked polyethylene, except for specific portions such as terminals 25, coils 26, and electric wires. In this sense, the main body 2 is simply referred to as being made of resin in this specification. The bobbin 23 is made of resin such as general polyethylene.

The annular member 4 is made of metal such as brass, for example. The annular member 4 has an inner peripheral surface formed with a second engaging portion 41 that snap-engages with the first engaging portion 31 formed on the outer peripheral surface of the main body 2 . The second engaging portion 41 has a second convex portion 42 and a second concave portion 43 . The first convex portion 32 of the first engaging portion 31 is fitted into the second concave portion 43 of the second engaging portion 41 , and the second convex portion 42 of the second engaging portion 41 is fitted into the first engaging portion 31 of the first engaging portion 31 . The outer peripheral surface of the main body 2 and the inner peripheral surface of the annular member 4 are snap-engaged by being fitted in the concave portion 33 .
A concave first groove portion 44 is formed on the outer peripheral surface of the annular member 4 .

The barrel 6 is made of metal such as copper alloy. The body 6 has one end 61 that engages with the annular member 4 so as to be rotatable about the axis CL and movement in the direction of the axis CL is restricted, and appliances such as a kitchen, washbasin, and toilet (not shown). and the other end 62 connected to the .

A concave second groove portion 63 is formed on the inner peripheral surface of the one end portion 61 of the barrel 6 . A snap ring 64 (see FIG. 2) as a connecting member is partially inserted into each of the first groove portion 44 of the annular member 4 and the second groove portion 63 of the barrel 6 . As a result, the one end 61 of the barrel 6 is engaged with the annular member 4 so as to be rotatable about the axis CL and restricted from moving in the direction of the axis CL.

As shown in FIG. 2A, the snap ring 64 has a C shape when viewed from the direction of the axis CL (see FIG. 1), and is made of metal such as stainless steel. The cross-sectional shape of the snap ring 64 is circular in FIG. 2(b), but may be other shapes such as square. Further, although the snap ring 64 is made of metal here, it may be made of other materials such as resin.

The other end 62 of the barrel 6 is threaded for connection with an instrument. Although this threaded portion is a male thread in FIG. 1(a), it may be a female thread. Moreover, although the other end portion 62 has a straight shape in FIG. 1(a), it may have a curved shape. Since the barrel 6 is made of metal, there is no risk of damage due to over-tightening of the threads, unlike the case of resin.

A recessed groove 66 is formed in the inner peripheral surface of the intermediate portion between the one end 61 and the other end 62 of the barrel 6 , and a seal member 65 is mounted in the groove 66 . The end portion of the main body 2 opposite to the electric fusion joint portion 21 extends in the direction of the axis CL to a position corresponding to the seal member 65 . As a result, the seal member 65 seals between the outer peripheral surface of the main body 2 and the inner peripheral surface of the barrel 6 .

The inner core 7 is press-fitted into the inner peripheral surface of the main body 2 on the side opposite to the electric fusion joint portion 21 . That is, the inner core 7 is press-fitted into the portion where the outer peripheral surface of the main body 2 and the inner peripheral surface of the annular member 4 are snap-engaged, and the inner peripheral surface of the main body 2 located radially inside the seal member 65 . ing. The in-core 7 has a cylindrical shape and is made of a metal such as a copper alloy. A flange portion 71 is formed at the end portion of the inner core 7 on the trunk 6 side. The flange portion 71 extends radially outward from the edge of the inner core 7 and has a ring plate shape. A stepped portion 67 is formed on the inner peripheral surface of the barrel 6 , and the flange portion 71 is arranged between the stepped portion 67 and the main body 2 .

Next, the operation of the rotary joint 100 integrated with the electric fusion joint according to the present embodiment will be described along the assembly procedure with reference to FIGS. 3 to 6. FIG.
First, as shown in FIG. 3(a), the annular member 4 is pushed into the main body 2 in the direction of the arrow. At this time, the portion of the first engaging portion 31 of the main body 2 made of resin is elastically deformed, and the first convex portion 32 of the main body 2 is fitted into the second concave portion 43 of the annular member 4 . The second protrusion 42 is fitted into the first recess 33 of the main body 2 . Thereby, as shown in FIG. 3(b), the outer peripheral surface of the main body 2 and the inner peripheral surface of the annular member 4 are snap-engaged.

Subsequently, as shown in FIG. 4(a), the inner core 7 is pushed into the main body 2 in the direction of the arrow. Thereby, as shown in FIG. 4B, the inner core 7 is press-fitted into the inner peripheral surface of the main body 2 on the side opposite to the electric fusion joint portion 21 . At this time, the inner core 7 is positioned with the flange portion 71 abutting against the end surface of the main body 2 opposite to the electric fusion joint portion 21 .

Subsequently, as shown in FIG. 5(a), the snap ring 64 is pushed into the annular member 4 in the direction of the arrow. As a result, as shown in FIG. 5B, the snap ring 64 is attached to the first groove portion 44 of the annular member 4 after being expanded in diameter and then inserted into the first groove portion 44 to be reduced in diameter.

Subsequently, as shown in FIG. 6A, the barrel 6 fitted with the seal member 65 is pushed into the main body 2 fitted with the annular member 4 in the direction of the arrow. At this time, the snap ring 64 enters the second groove portion 63 of the barrel 6 after being contracted in diameter, expands in diameter, and partially enters the first groove portion 44 and the second groove portion 63 respectively. As a result, as shown in FIG. 6B, the one end 61 of the barrel 6 is rotatable about the axis CL (see FIG. 1) with respect to the annular member 4, and movement in the direction of the axis CL is restricted. to engage. A seal member 65 attached to the barrel 6 contacts the outer peripheral surface of the main body 2 and seals the gap between the outer peripheral surface of the main body 2 and the inner peripheral surface of the barrel 6 .

As described above, the electric fusion joint-integrated rotary joint 100 according to this embodiment includes a resin main body 2 having an electric fusion joint portion 21 for electro-fusion of the end portion of the resin pipe 1, and A metal annular member 4 having an inner peripheral surface that snap-engages with the outer peripheral surface engages with the annular member 4 so as to be rotatable about the axis CL and movement in the direction of the axis CL is restricted. a metal barrel 6 having one end 61 and the other end 62 for connection with the instrument.

In this embodiment, the electric fusion joint-integrated rotary joint 100 includes a snap engagement portion between the resin main body 2 having the electric fusion joint portion 21 and the metal annular member 4, and the metal ring member 4. It is divided into a body 6 of parts and a rotation mechanism part of the ring member 4. - 特許庁Therefore, when the barrel 6 rotates, the barrel 6 and the ring member 4 of the metal parts rotate relatively, and the metal ring member 4 and the resin body 2 which are snap-engaged are substantially relative to each other. Do not rotate. In this way, since the portion to be snap-engaged hardly rotates, the occurrence of wear and scraping is suppressed. This prevents the main body 2 from slipping out of the barrel 6 .
On the other hand, the rotation of the metal shell 6 having the other end 62 connected to the instrument is ensured by the relative rotation of the shell 6 and the ring member 4 of the metal parts.
Further, in the prior art (Patent Documents 1 and 2), a part of the inner peripheral surface of the inner cylindrical portion is expanded using a diameter-expanding jig so that the outer cylindrical portion and the inner cylindrical portion, which are snap-engagement portions, are expanded. However, in this embodiment, the rotation of the barrel 6 is ensured by the rotation mechanism between the metal parts, not by the snap engagement portion. Therefore, in the present embodiment, diameter expansion work using a diameter expansion jig, which is required in the prior art, is not required, and the number of assembling man-hours can be reduced.
Therefore, according to the present embodiment, it is possible to suppress the occurrence of wear and scraping due to the rotation of the portion to be snap-engaged while ensuring the rotation of the portion to be connected to the instrument, and to reduce the number of assembly man-hours. A fitting 100 can be provided.

Further, in this embodiment, the first protrusion 32 and the first recess 33 are formed on the outer peripheral surface of the main body 2, and the second protrusion 42 and the second recess 43 are formed on the inner peripheral surface of the annular member 4. there is Then, the first protrusion 32 is fitted into the second recess 43, the second protrusion 42 is fitted into the first recess 33, and the outer peripheral surface of the main body 2 and the inner peripheral surface of the annular member 4 are snap-engaged. is doing. With this configuration, the outer peripheral surface of the main body 2 and the inner peripheral surface of the annular member 4 can be snap-engaged more firmly.

Further, in this embodiment, the first groove portion 44 is formed on the outer peripheral surface of the annular member 4 and the second groove portion 63 is formed on the inner peripheral surface of the one end portion 61 of the barrel 6 . The snap ring 64 is partially inserted into each of the first groove portion 44 and the second groove portion 63, so that the one end portion 61 of the barrel 6 can rotate about the axis CL with respect to the annular member 4 and move in the direction of the axis CL. Engaged so that movement is restricted. In this way, desired engagement can be achieved with a simple configuration.

In addition, in this embodiment, a cylindrical inner core 7 made of metal is press-fitted into the inner peripheral surface of the main body 2 on the side opposite to the electric fusion joint portion 21 . In this configuration, when a tensile load is applied in a direction separating the main body 2 and the trunk 6, the inner peripheral surface of the main body 2 made of resin can be prevented from being deformed radially inward by the inner core 7.例文帳に追加As a result, the main body 2 is further suppressed from slipping out of the barrel 6. - 特許庁

Further, in this embodiment, a flange portion 71 is formed at the end portion of the in-core 7 on the side of the trunk 6 , and a stepped portion 67 is formed on the inner peripheral surface of the trunk 6 . The flange portion 71 is arranged between the stepped portion 67 and the main body 2 . With this configuration, the inner core 7 does not slip out of the main body 2, for example, during transportation.

Further, in this embodiment, a sealing member 65 seals between the outer peripheral surface of the main body 2 and the inner peripheral surface of the barrel 6 . With this configuration, water leakage from the electric fusion joint-integrated rotary joint 100 can be suppressed more reliably.

Further, it is desirable that the rotary joint 100 integrated with the electric fusion joint according to this embodiment constitutes a unit pipe in which the end portion of the resin pipe 1 (see FIG. 1) is electrically fused. In this case, the rotary joint 100 integrated with the electric fusion joint is electrically fused to the end of the resin pipe 1 at the factory to produce a unit pipe, and the rotary joint 100 integrated with the electric fusion joint of the unit pipe is attached at the site. A unit plumbing method that connects to the appliance may be employed. The electric fusion is performed by energizing the terminal 25 while the resin pipe 1 is inserted inside the electric fusion joint portion 21 of the main body 2 . At this time, the coil 26 generates heat due to the energization of the terminal 25, and the outer peripheral surface of the resin pipe 1 and the inner peripheral surface of the electric fusion joint portion 21 of the electric fusion joint integrated rotary joint 100 are melted and integrated. It is joined by As a result, the electric fusion joint-integrated rotary joint 100 is electrically fused to the end of the resin pipe 1 .
According to such a configuration, in addition to the effects of the above-described electric fusion joint integrated rotary joint 100, by manufacturing the unit piping in advance at the factory, the connection point on the site can be integrated with the appliance and the electric fusion joint. The number of connection points with the rotary joint 100 can be reduced, and the risk of water leakage can be further reduced.

As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the configurations described in the above-described embodiments and modifications. The configuration of the present invention can be changed as appropriate without departing from the gist of the invention, including appropriate combination or selection of the configurations described in the above-described embodiments.

REFERENCE SIGNS LIST 1 resin pipe 2 main body 21 electrical fusion joint 32 first protrusion 33 first recess 4 annular member 42 second protrusion 43 second recess 44 first groove 6 barrel 61 one end 62 other end 63 second groove 64 snap ring (connecting member)
65 Sealing member 67 Stepped portion 7 In-core 71 Flange portion 100 Electric fusion joint integrated rotary joint CL Axis

Claims (6)

a resin main body having an electric fusion joint portion for electrically fusion-bonding the ends of the resin pipe;
a metal annular member having an inner peripheral surface that snap-engages with the outer peripheral surface of the body;
a metal barrel having one end engaged with the annular member so as to be rotatable about the axis and restricted from moving in the axial direction, and the other end connected to an instrument;
with
A cylindrical metal inner core is press-fitted into the inner peripheral surface of the main body on the side opposite to the electric fusion joint,
A flange portion is formed at the trunk-side end portion of the in-core,
A stepped portion is formed on the inner peripheral surface of the barrel,
A rotary joint integrated with an electric fusion joint , wherein the flange portion is arranged between the stepped portion and the main body . A first protrusion and a first recess are formed on the outer peripheral surface of the main body, and a second protrusion and a second recess are formed on the inner peripheral surface of the annular member,
The first protrusion is fitted into the second recess, the second protrusion is fitted into the first recess, and the outer peripheral surface of the main body and the inner peripheral surface of the annular member are snap-engaged. The electric fusion joint-integrated rotary joint according to claim 1, characterized in that: A first groove is formed on the outer peripheral surface of the annular member, and a second groove is formed on the inner peripheral surface of the one end of the barrel,
The connecting member is partially inserted into each of the first groove portion and the second groove portion, and the one end portion of the barrel is rotatable about the axis with respect to the annular member, and movement in the axial direction is restricted. 2. The electric fusion joint integrated rotary joint according to claim 1, wherein the rotary joint according to claim 1. 2. The electric fusion joint integrated rotary joint according to claim 1, wherein a sealing member seals between the outer peripheral surface of the main body and the inner peripheral surface of the body. A unit pipe, wherein the electric fusion joint integrated rotary joint according to any one of claims 1 to 4 is electrically fused to an end portion of the resin pipe. The electric fusion joint integrated rotary joint according to any one of claims 1 to 4 is electrically fused to the end of the resin pipe in a factory to manufacture a unit pipe,
A unit piping construction method, wherein the electric fusion joint integrated rotary joint of the unit piping is connected to the device on site.

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