JP2017057928A - Pipe joint and piping structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of reducing the number of times of fusion work in the whole of piping installation work.SOLUTION: A pipe joint 1 includes: a main pipe part 20 including a first flow passage 21, a second flow passage 22, and a tapered flow passage 23 connected to the first flow passage 21 and the second flow passage 22; and a branch pipe part 30 branched from the main pipe part 20, and including a branch flow passage 33. An inner diameter d1 at a connection end part (first connection end part 21c) of the first flow passage 21 is longer than an inner diameter d2 at a connection end part (second connection end part 22c) of the second flow passage. The branch flow passage 33 is branched from the first flow passage 21 or the second flow passage 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint having the functions of a branch pipe joint and a different diameter pipe joint, and a piping structure using the same.

  Conventionally, pipe structures for water supply or hot water supply or for air conditioning in buildings such as mid-to-high-rise apartment buildings and office buildings are mainly composed of vertical pipes extending in the vertical direction of the building and a plurality of horizontal pipes. (For example, refer patent document 1). Here, the vertical pipe is a pipe in which a plurality of pipes are connected by a plurality of pipe joints, and each horizontal pipe is a pipe in which a plurality of pipes branched from the vertical pipe and extending in the horizontal direction are connected by a plurality of pipe joints. It is. Such a piping structure is used for supplying clean water, for example.

The water flows through the vertical pipe from the bottom to the top, but the pressure rises as it goes up. For this reason, for example, it is necessary to reduce the inner diameter of the vertical pipe in accordance with the pressure loss every time it goes up a predetermined floor (2, 3, 4 or 5 floor). Since each pipe is a so-called straight pipe whose inner diameter does not change in the longitudinal direction, it is necessary to provide a different-diameter pipe joint called a reducer at an important point of the vertical pipe.
The vertical pipe is provided with a branch pipe joint called cheese, and the horizontal pipe needs to be connected to the branch pipe joint.
Similarly, when clean water flows in the horizontal direction in the horizontal pipe, the longer the distance in the horizontal direction, the greater the pressure loss. For this reason, a different diameter pipe joint may be provided also in the important part of horizontal piping.

In addition, the pipe and the pipe joint include a resin pipe (hereinafter simply referred to as a pipe) and a resin pipe joint (hereinafter also simply referred to as a pipe joint) formed of a resin material. Examples of the resin pipe joint include a branched resin pipe joint (hereinafter sometimes simply referred to as a branch pipe joint) and a different diameter resin pipe joint (hereinafter sometimes simply referred to as a different diameter pipe joint).
Thereby, the workability | operativity of the pipe joining in the place (for example, pipe installation construction site) where a pipe is installed becomes easy, and corrosion of a pipe can be prevented. The pipe and the pipe joint are formed with a slot and a receptacle, and the receptacle is provided with an electric fusion means.
Such connection between the pipe and the pipe joint and connection between the pipe and the pipe are performed by fusion. For fusion, heat is generated by the electric fusion means by inserting the insertion port into the reception port and the contact portion where the reception port and the connection port are in contact with each other and the vicinity thereof (hereinafter also referred to as a fusion portion). Then, it is naturally cooled and fused.
The operator needs to hold the pipe and the pipe joint to be connected so that they do not move during the period from the time when the fused portion is melted to the time of natural cooling.

JP 2012-87866 A

  However, in vertical piping, it is necessary to provide branch pipe joints for each floor and to provide different diameter pipe joints for each predetermined floor, and also in horizontal pipes, branch pipe joints are provided at predetermined positions and predetermined distances are provided. Since it is necessary to provide different diameter pipe joints every time, there are a large number of pipes, branch pipe joints, different diameter pipe joints and the like that require fusion in the entire piping installation work site. Specifically, at least branch pipe joints and irregular pipe joints are required between the vertical pipes having different diameters. For this reason, the ratio of the fusion work time to the overall pipe installation work time of the pipe installation work is large, and a reduction in the number of fusion work is required.

  This invention is made | formed in view of such a request | requirement, and makes it a subject to provide the pipe joint which can reduce the frequency | count of a fusion | fusion operation | work in the whole piping installation construction.

The pipe joint according to the present invention branches from the main pipe section, the main pipe section having a first flow path, a second flow path, and a tapered flow path connecting the first flow path and the second flow path. A branch pipe portion having a branch flow path, and an inner diameter at a joint end portion of the first flow path is larger than an inner diameter at a joint end portion of the second flow path.
It is preferable that the branch channel is branched from the first channel or the second channel.
The piping structure according to the present invention includes the above-described pipe joint, a large-diameter connection pipe, a small-diameter connection pipe, and a branch connection pipe, and the first flow path is formed on the inner peripheral side of the large-diameter connection pipe. The second flow path is joined to a small diameter connection pipe flow path formed on the inner peripheral side of the small diameter connection pipe, and the branch flow path is connected to the branch connection pipe It joins with the branch connection pipe flow path formed in the inner peripheral side.

  According to the present invention, the first flow path, the second flow path, the main pipe portion having the tapered flow path connecting the first flow path and the second flow path, and the branch flow path branched from the main pipe portion. And the inner diameter at the joint end of the first flow path is larger than the inner diameter at the joint end of the second flow path, so that the pipe joint functions as a different diameter pipe joint and a branch pipe joint. As a result, the number of fusing operations can be reduced in the entire pipe installation work.

It is sectional drawing which abbreviate | omitted one part which shows 1st Embodiment of the pipe joint which concerns on this invention. It is sectional drawing which abbreviate | omitted one part which shows 2nd Embodiment of the pipe joint which concerns on this invention. It is sectional drawing which abbreviate | omitted one part which shows 3rd Embodiment of the pipe joint which concerns on this invention. It is sectional drawing which abbreviate | omitted one part which shows 4th Embodiment of the pipe joint which concerns on this invention. It is sectional drawing which abbreviate | omitted one part which shows 5th Embodiment of the pipe joint which concerns on this invention. It is sectional drawing which abbreviate | omitted one part which shows 6th Embodiment of the pipe joint which concerns on this invention. It is the schematic of embodiment of the piping structure using the pipe joint which concerns on this invention.

  Hereinafter, a pipe joint which is an embodiment to which the present invention is applied and a piping structure using the same will be described with reference to the drawings. The drawings used in the following description are schematic, and the ratios of length, width, and thickness are not necessarily the same as actual ones, and can be changed as appropriate. In addition, the matters described in the embodiments can be applied to other embodiments without specific description as long as no contradiction arises. Moreover, in each embodiment, the same code | symbol is attached | subjected to the same member and the description is abbreviate | omitted.

(First embodiment)
With reference to FIG. 1, the pipe joint 1 which concerns on this invention is demonstrated.
The pipe joint 1 includes a main pipe portion 20 (hereinafter, the axis of the main pipe portion 20 is referred to as an axis a) that connects two pipes having different inner diameters in the vertical direction (hereinafter referred to as the X direction), and a horizontal direction (perpendicular to the X direction) And a branch pipe portion 30 for connecting a pipe (hereinafter referred to as a branch connection pipe 230, and an axis of the branch connection pipe 230 is referred to as an axis b) extending in the direction to be referred to as the Y direction.
The main pipe section 20 includes a first fitting section 41 that fits a large diameter pipe (hereinafter referred to as a large diameter connecting pipe 240) and a small diameter pipe (hereinafter referred to as a small diameter connecting pipe 250). And a second fitting portion 42 to be fitted.
The branch pipe part 30 includes a branch fitting part 43 that fits into the branch connection pipe 230.

  The main pipe portion 20 includes a first flow path 21, a second flow path 22, and a tapered flow path 23 that connects the first flow path 21 and the second flow path 22. The first channel 21 and the second channel 22 are cylindrical spaces formed on the inner surface of the tubular member. The tapered flow path 23 is a tapered tubular space that connects the first flow path 21 and the second flow path 22, and specifically, the inner diameter increases from the first flow path 21 toward the second flow path 22. A space that shrinks.

The first flow path 21 is joined to the large diameter connection pipe flow path 242 formed on the inner peripheral side of the large diameter connection pipe 240 when the first fitting portion 41 and the large diameter connection pipe 240 are fitted. . Of the joint portions where both are joined, the joint portion on the first fitting portion 41 side is referred to as a first joint end portion 21c, and the joint portion on the large diameter connecting tube 240 side is referred to as a joint end portion 244.
The second flow path 22 is joined to the small diameter connection pipe flow path 252 formed on the inner peripheral side of the small diameter connection pipe 250 when the second fitting portion 42 and the small diameter connection pipe 250 are fitted. Of the joining portions where both are joined, the joining portion on the second fitting portion 42 side is referred to as a second joining end portion 22c, and the joining portion on the small diameter connecting pipe 250 side is referred to as a joining end portion 254.

The first flow path 21, the tapered flow path 23, and the second flow path 22 are configured such that a cylindrical axis of the first flow path 21 and the second flow path 22 and a tapered tubular axis of the tapered flow path 23 are the axis a. Although it connects from the one end of the main pipe part 20 toward the other end (X direction) so that it may become common, you may connect so that it may become eccentric with respect to the axis | shaft a. The inner diameter d1 at the first joint end 21c of the first flow path 21 is larger than the inner diameter d2 at the second joint end 22c of the second flow path 22.
The inner diameter d2 at the second joint end 22c of the second flow path 22 is preferably 75 to 90% of the inner diameter d1 at the first joint end 21c of the first flow path 21.

  The first fitting part 41 is formed at the end of the main pipe part 20 on the first flow path 21 side. The 1st fitting part 41 in this embodiment is an outlet inserted in the inner peripheral side of the large diameter connecting pipe 240. FIG. The large-diameter connecting pipe 240 includes a first fitted portion 241 that fits with the first fitting portion 41.

  In the present embodiment, the inner diameter e1 of the flow path 242 of the large-diameter connecting pipe 240 is substantially the same as the inner diameter d1, but it is only necessary to have a relationship of inner diameter e1 ≧ inner diameter d1. The inner diameter e1a of the first fitted portion 241 is substantially the same as the outer diameter D1 of the first fitting portion 41. Between the first fitted portion 241 and the flow path 242, the end portion (joint portion) of the insertion port of the first fitting portion 41 inserted due to the stepped portion caused by the difference between the inner diameter e1 and the inner diameter e1a. Is formed, and the contact surface 243 acts as a stopper portion.

The second fitting portion 42 is formed at the end of the main pipe portion 20 on the second flow path 22 side. The 2nd fitting part 42 in this embodiment is a slot inserted in the inner peripheral side of the small diameter connecting pipe 250. FIG. The small diameter connecting pipe 250 includes a second fitted portion 251 that fits with the second fitting portion 42.
In the present embodiment, the inner diameter e2 of the flow path 252 of the small diameter connecting pipe 250 is substantially the same as the inner diameter d2, but it is only necessary to have a relationship of inner diameter e2 ≧ inner diameter d2. The inner diameter e2a of the second fitted portion 251 is substantially the same as the outer diameter D2 of the second fitting portion. Between the second fitted portion 251 and the flow path 252, an end portion (joint portion) of the inserted second fitting portion 42 due to a step portion generated by a difference between the inner diameter e2 and the inner diameter e2a. Is formed, and the contact surface 253 acts as a stopper portion.

The branch pipe part 30 has a branch flow path 33. The branch pipe part 30 branches from the main pipe part 20 in the Y direction. The branch flow path 33 is a cylindrical space formed on the inner surface of the tubular member, and is connected to the first flow path 21. When the branch fitting portion 43 and the branch connection pipe 230 are fitted, the branch flow path 33 is joined to the branch connection pipe flow path 232 formed on the inner peripheral side of the branch connection pipe 230, and both are joined. Of the joint portions, the joint portion on the branch fitting portion 43 side is referred to as a branch joint end portion 33c, and the joint portion on the branch connection pipe 230 side is referred to as a joint end portion 234.
An inner diameter d3 at the branch joint end 33c of the branch flow path 33 is smaller than an inner diameter d1 at the first joint end 21c of the first flow path 21, and an inner diameter d2 at the second joint end 22c of the second flow path 22 is. Less than or equal to

  The branch fitting part 43 is formed at the end of the branch pipe part 30 opposite to the main pipe part 20 side. The branch fitting portion 43 in the present embodiment is a gap inserted on the inner peripheral side of the branch connection pipe 230. The branch connection pipe 230 includes a branch fitting portion 231 that fits with the branch fitting portion 43. The inner diameter e3 of the flow path 232 of the branch connection pipe 230 is substantially the same as the inner diameter d3, but it is only necessary to have a relationship of the inner diameter e3 ≧ the inner diameter d3. The inner diameter e3a of the branch fitting part 231 is substantially the same as the outer diameter D3 of the branch fitting part 43. Between the branch fitting portion 231 and the flow path 232, the end portion (joint portion) of the inserted branch fitting portion 43 is contacted by a step portion generated by the difference between the inner diameter e3 and the inner diameter e3a. A ring-shaped contact surface 233 that is in contact with each other is formed, and the contact surface 233 functions as a stopper portion.

  The first flow path 21, the tapered flow path 23, the second flow path 22 and the branch flow path 33 are in a state where the pipe joint 1 is connected to the large diameter connection pipe 240, the small diameter connection pipe 250 and the branch connection pipe 230. It is the part where the water that has passed through is in direct contact.

The first joint end 21c contacts the joint end 244 when the first fitting part 41 is inserted into the first fitted part 241 so that the first flow path 21 and the flow path 242 are connected. It is the part that touches.
The second joint end portion 22c contacts the joint end portion 254 when the second fitting portion 42 is inserted into the second fitted portion 251 so that the second flow path 22 and the flow path 252 are connected. It is the part that touches.
The branch joint end portion 33 c is a portion that comes into contact with the joint end portion 234 when the branch fitting portion 43 is inserted into the branch fitting portion 231 so that the branch flow passage 33 and the flow passage 232 are connected. . The joining end portion 234 is a step portion generated by the difference between the inner diameter e3 and the inner diameter e3a, and acts as a stopper portion.

  Each fitting portion of the large-diameter connection pipe 240, the small-diameter connection pipe 250, and the branch connection pipe 230 is provided with an electric fusion means (not shown) similar to the electric fusion means 50 described later. A straight pipe with a single receiving port provided with the electric fusion means 50 at one end can be used. In this case, the resin material of the pipe joint 1, the large diameter connecting pipe 240, the small diameter connecting pipe 250, and the branch connecting pipe 230 is a thermoplastic resin such as polyethylene, polypropylene, or polybutene.

  In addition, when using what does not have the electrofusion means 50 as a fitting part of the large diameter connection pipe 240, the small diameter connection pipe 250, and the branch connection pipe 230, it is comprised with the material which can be connected with an adhesive agent, As a resin material for the large-diameter connecting pipe 240, the small-diameter connecting pipe 250, and the branch connecting pipe 230, for example, a thermosetting resin such as polyvinyl chloride, AES, or ABS is used.

  The outer diameter D1 of the first fitting portion 41 is larger than the outer diameter D2 of the second fitting portion 42. For this reason, the outer shape of the main pipe portion 20 that forms the tapered flow path 23 is also tapered. Thereby, when the pipe joint 1 is appearance-appeared, it is possible to easily distinguish whether the end of the pipe joint 1 is the first fitting part 41 or the second fitting part 42.

  The wall thickness t of the main pipe portion 20 forming the first flow path 21 is substantially uniform in the circumferential direction of the first flow path 21. For example, the thickness of the portion where the branch pipe section 30 is formed is reinforced. For this reason, it may be thicker than other portions.

  The above pipe joint 1 will have the function of a different diameter pipe joint and a branch pipe joint, and can reduce the frequency | count of work of a pipe joint connection in the whole piping installation construction.

The branch pipe part 30 may be inclined toward the first fitting part 41 or the second fitting part 42.
The length of the branch pipe part 30 is arbitrary, and a pipe having the same diameter as the branch pipe part 30 may be butt-fused for extension.
The branch pipe portion 30 may have an elbow shape that bends at a right angle.
Instead of the branch fitting part 43 of the branch pipe part 30, a metal joint may be integrally formed at the end of the branch pipe part 30 so that it can be connected to the branch connection pipe 230 via the metal joint.
Instead of the branch fitting part 43 of the branch pipe part 30, a flange connection part having a flange shape may be formed so that it can be connected to a branch pipe having a flange connection part having a similar flange shape.

(Second Embodiment)
With reference to FIG. 2, the pipe joint 2 which concerns on this invention is demonstrated.
The pipe joint 2 is configured by receiving the first fitting portion 41 and the second fitting portion 42 of the pipe joint 1, and the electric fusion means 50 is provided to the first fitting portion 41 and the second fitting portion 42. I have.

  The first fitting portion 41 is formed with a first fitted portion 41 a into which the connection port 210 is inserted. The first fitted portion 41 a is connected to the first flow path 21. An opening 21 a of the first fitted portion 41 a is formed at the end of the first fitting portion 41. The inner diameter d1a of the first fitted portion 41a is substantially the same as the outer diameter E1 of the connecting pipe 210. In the present embodiment, the inner diameter e1 is substantially the same as the inner diameter d1, but it is sufficient that the inner diameter e1 ≦ the inner diameter d1.

  The second fitting portion 42 is formed with a second fitted portion 42a into which the connection port 220 is inserted. The second fitted portion 42 a is connected to the second flow path 22. An opening 22 a of the second fitted portion 42 a is formed at the end of the second fitting portion 42. The inner diameter d2a of the second fitted portion 42a is substantially the same as the outer diameter E2 of the connecting pipe 220. In the present embodiment, the inner diameter e2 is substantially the same as the inner diameter d2, but it is sufficient that the inner diameter e2 ≦ the inner diameter d2.

Between the 1st to-be-fitted part 41a and the 1st flow path 21, the ring-shaped contact surface 21b with which the edge part (joint part) of the insertion port 210 of the inserted connection pipe contact | abuts is formed. The contact surface 21b acts as a stopper portion.
Between the 2nd to-be-fitted part 42a and the 2nd flow path 22, the ring-shaped contact surface 22b with which the edge part (joint part) of the insertion port 220 of the inserted connection pipe 220 contact | abuts is formed. The contact surface 22b acts as a stopper portion.

Since the first joint end portion 21c is a joint portion when the connection pipe 210 is inserted into the first fitted portion 41a so that the first flow path 21 and the flow path 212 of the connection pipe 210 are connected, In the X direction, it is at the same position as the contact surface 21b, and is located on the opposite side of the opening 21a side of the first fitted portion 41a.
Since the second joint end portion 22c is a joint portion when the connection pipe 220 is inserted into the second fitted portion 42a so that the second flow path 22 and the flow path 222 of the connection pipe 220 are connected, In the X direction, it is at the same position as the contact surface 22b, and is located on the opposite side of the opening 22a side of the second fitted portion 42a.

  The electric fusion means 50 includes an electric terminal 51, an electric terminal 52, an electric heating element 53 such as a heating wire electrically connected to the electric terminal 51, and a heating wire electrically connected to the electric terminal 52. The electric heating element 54 and a connecting wire (not shown) for electrically connecting the electric heating element 53 and the electric heating element 54.

  A cylindrical portion 55 is formed in the vicinity of the first fitting portion 41 side of the main pipe portion 20, and a cylindrical portion 56 is formed in the vicinity of the second fitting portion 42 side. The electric terminal 51 is disposed in a recess 57 formed at the end of the cylindrical portion 55. The electrical terminal 52 is disposed in a recess 58 formed at the end of the cylindrical portion 56. In the present embodiment, the electric terminal 51 extends from the end of the first fitting portion 41 in a direction substantially parallel to the axis b, and the electric terminal 52 is substantially parallel to the axis b from the end of the second fitting portion 42. However, it is sufficient that the branch pipe portion 30, the electric terminal 51, and the electric terminal 52 are on substantially the same plane, and further, if the electric terminal 51 and the electric terminal 52 extend in the Y direction. Good. For example, when viewed from the direction in which the axis a extends (the horizontal direction in FIG. 2, hereinafter also referred to as the axis a direction), the electrical terminal 51 and the electrical terminal 52 only need to overlap the branch pipe portion 30.

Since the so-called pipe space through which the pipes in the building pass is narrow, when viewed from the direction of the axis a, the branch pipe portion 30, the electric terminal 51, and the electric terminal 52 are arranged on substantially the same straight line, thereby Space can be saved.
In addition, the connection between the connection pipe 210 and the pipe joint 2 and the connection between the connection pipe 220 and the pipe joint 2 in the pipe space may be performed while looking through an opening formed in the pipe space. If the electric terminal 51 and the electric terminal 52 are provided not in the direction in which the branch pipe portion 30 extends (Y direction) but in the direction orthogonal to the X direction and the Y direction (the front side or the back side in FIG. 2), the branching occurs. Depending on the direction of the pipe portion 30, there is a possibility that the positions of the electric terminal 51 and the electric terminal 52 may be invisible to the operator (for example, the electric terminal 51 and the electric terminal 52 are in the pipe space of the pipe joint 2. There is a possibility of facing the opposite side of the opening). However, since the pipe joint 2 has the electric terminal 51 and the electric terminal 52 arranged substantially on the same straight line as the branch pipe part 30, the branch pipe part 30 extends rightward or leftward when viewed from the opening of the pipe space. Thus, even if the pipe joint 2 is arranged, the electric terminal 51 and the electric terminal 52 also extend in the same direction as the branch pipe part 30. For this reason, even when performing the above-described joining operation, the operator can easily visually recognize the electric terminal 51 and the electric terminal 52 and can efficiently perform the melting operation.

The electric heating element 53 is embedded in the first fitting portion 41 so that the vicinity of the inner peripheral surface of the first fitted portion 41a is melted. The electric heating element 54 is embedded in the second fitting portion 42 so that the vicinity of the inner peripheral surface of the second fitted portion 42a is melted.
When the electric heating element 53 is a heating wire, the heating wire is embedded in the first fitting portion 41 so as to wind the first fitted portion 41a in a spiral shape. When the electric heating element 54 is a heating wire, the heating wire is embedded in the second fitting portion 42 so that the second fitting portion 42a is spirally wound.
When the electricity is supplied to the electrical terminal 51 and the electrical terminal 52, the heating wire embedded in the first fitting portion 41 and the second heating wire 53 are heated so that the electrical heating element 53 and the electrical heating element 54 are heated simultaneously. The connecting wire connecting the heating wire embedded in the fitting portion 42 is connected in the main pipe portion 20 while avoiding the branch flow path 33 of the branch pipe portion 30.

A bar code tag with a bar code attached to a detachable tag is attached to the pipe joint 2 to the electric terminal 51, the electric terminal 52, and the branch pipe section 30, or both side surfaces of the pipe joint 2 (the front side in FIG. Barcode stickers are affixed to the side and the back side of the paper. Thereby, the barcode tag can be read regardless of the direction of the branch pipe portion 30 in the pipe space.
On the bar code tag and the bar code sticker, a bar code on which the voltage applied to the electric terminal 51 and the electric terminal 52 and the time (hereinafter referred to as fusion conditions) are recorded is printed. When the barcode reader of the fusion apparatus connected to the electrical terminal 51 and the electrical terminal 52 reads the barcode, the fusion condition is input to the fusion apparatus.

The end of the branch pipe portion 30 may be a receiving port, and the receiving port may be provided with an electric fusion means, or the first fitting portion 41 or the second fitting portion 42 may be a differential port.
Further, the electric fusion means 50 is provided with two sets of electric terminals 51 and electric terminals 52, the electric heating element 53 is heated by one electric terminal 51 and the electric terminal 52, and the other electric terminal 51 and electric terminal 52 are used. The electric heating element 54 may be heated.
In addition, when the electric fusion means 50 is provided with two sets of electric terminals, there is no electrical connection between the electric heating element 53 and the electric heating element 54. As shown in FIG. When the branch flow path 33 is formed by a drill or the like, it is not necessary to consider avoiding the connection electric wire (built-in connection electric wire) between the electric heating element 53 and the electric heating element 54 from being disconnected.
The resin material of the pipe joint 1, the connecting pipe 210, the connecting pipe 220, and the branch connecting pipe 230 is a thermoplastic resin such as polyethylene, polypropylene, or polybutene.

(Third embodiment)
With reference to FIG. 3, the pipe joint 3 which concerns on this invention is demonstrated.
The pipe joint 3 is the same as the pipe joint 2 except that the branch flow path 33 is connected to the second flow path 22. In this case, the pipe joint 3 can be easily formed by changing only the inner shape of the injection molding of the pipe joint 2.

(Fourth embodiment)
With reference to FIG. 4, the pipe joint 4 which concerns on this invention is demonstrated.
In the pipe joint 4, the outer diameter D1 of the first fitting portion 41 and the outer diameter D2 of the second fitting portion 42 are substantially the same. That is, the external appearance of the pipe joint 4 other than the electric fusion means 50 is substantially the same as the external appearance of the branch joint other than the electric fusion means 50. For this reason, the pipe joint 4 can be easily formed by using the injection molding of the outer shape of the branch pipe joint and changing only the inner shape of the injection molding.
Moreover, although the branch flow path 33 is connected to the second flow path 22, it may be connected to the first flow path 21 as shown in FIG. 1 or FIG. 2.

(Fifth embodiment)
With reference to FIG. 5, the pipe joint 5 which concerns on this invention is demonstrated.
The pipe joint 5 is a pipe joint formed by integrating the pipe joint part 60, the pipe joint part 61, and the pipe joint part 62 by butt fusion. In the present embodiment, the second fitting portion 42 of the main pipe portion 20 acts as a gap.
The visibility of the position and orientation of the branch pipe portion 30 of the pipe joint 3 can be improved by making the colors of the pipe joint part 60, the pipe joint part 61, and the pipe joint part 62 different from each other.
Further, when a pipe joint component 62 including an electric fusion means and a metal joint is used, the pipe joint part 62 can be joined to the branch connection pipe without using a pipe joint.

The pipe joint component 60 is, for example, a component in which a socket for connecting and extending two pipes is cut into a predetermined length, and a fitting portion of a receiving port is formed at one end. For this reason, the pipe joint component 60 has a first fitting portion 41 at one end and a fitting portion at the other end. The first fitting portion 41 is formed with an electric fusion means 50.
The pipe joint component 61 is a different diameter pipe joint whose both ends are fitting portions of a difference port, and is a component obtained by cutting a large diameter difference port among the difference ports at both ends. Therefore, the pipe joint component 61 includes a part of the first flow path 21, the tapered flow path 23, and the second flow path 22.
The pipe joint part 62 is a pipe having fitting portions at both ends serving as a gap, forms a part of the branch flow path 33, and has the same length as the branch pipe part 30.

  The main pipe part 20 is formed by joining a pipe joint part 60 and a pipe joint part 61 by butt fusion. At this time, when joining by butt fusion is performed, ring-shaped protrusions 61b and protrusions 61c called beads are formed on the inside and the outside of the ring-shaped joint surface 61a between the pipe joint part 60 and the pipe joint part 61, respectively.

The branch pipe part 30 joins the pipe joint part 62 to the side surface of the main pipe part 20 of the pipe joint part 60 by butt fusion. At this time, ring-shaped protrusions 62b and protrusions 62c are formed on the inside and the outside of the ring-shaped joint surface 62a between the pipe joint part 60 and the pipe joint part 62, respectively.
Next, a connection space s for connecting the branch flow path 33 and the first flow path 21 is formed on the side surface of the main pipe portion 20 using a drill or the like. At this time, since a drill having substantially the same diameter as that of the branch flow path 33 of the pipe joint part 62 is inserted into the branch flow path 33, the ring-shaped protrusion 62b is almost scraped.
The pipe fitting part 61 has substantially the same shape as a conventional reducer, and the pipe fitting part 60 can be obtained from a conventional socket. Therefore, since the pipe joint part 62 can be obtained from a conventional pipe, the pipe joint part 60, the pipe joint part 61 and the pipe joint part 62 can be obtained easily and inexpensively, and the manufacturing cost of the pipe joint 3 is low. Can be.

  In addition, each of the pipe joint part 61 and the pipe joint part 62 to be butt-fused to the pipe joint part 60 is provided with a receptacle provided with an electric fusion means in advance, a slot inserted into the electric fusion means, and a metal joint. In addition, pipe joints having various connection structures can be easily manufactured by combining parts having various connection structures such as flanges.

  Note that the pipe joint part 62 may be integrated by butt fusion with a different diameter pipe joint having a shape in which the pipe joint part 60 and the pipe joint part 61 are integrated. Further, the pipe joint part 61 may be integrated with the branch pipe joint having a shape in which the pipe joint part 60 and the pipe joint part 62 are integrated.

(Sixth embodiment)
With reference to FIG. 6, the pipe joint 6 which concerns on this invention is demonstrated.
The pipe joint 6 has a shape in which a pipe joint part 60 and a pipe joint part 62 shown in FIG. 5 are integrated, and the first fitting part 41 and the fitting part 411 at both ends are branch pipe joints. The pipe joint component 61 which is a different-diameter joint is integrated with 60a by butt fusion.
Since the branch pipe joint 60a is a branch pipe joint in which both the first fitting portion 41 and the fitting portion 411 are outlets, the main pipe portion 20 is fitted with the stopper portion 60s of the first fitting portion 41. A stopper portion 60s of the joint portion 411 is formed. Further, the first joint end portion 21 c of the first flow path 21 is open to the end portion of the first fitting portion 41.
Therefore, since the pipe joint 5 does not include the electric fusion means 50, it is not necessary to handle the electric fusion means 50 so that the electric fusion means 50 does not fail before the resin pipe installation work. Can be improved.

(Pipe structure embodiment)
With reference to FIG. 7, the piping structure 200 using the above-mentioned pipe joints 1-6 is demonstrated.
Generally, the piping structure includes any of the pipe joints 1 to 6 of the first to sixth embodiments described above, a large diameter connecting pipe 240, a small diameter connecting pipe 250, and a branch connecting pipe 230. The first flow path 21 is joined to the large diameter connection pipe flow path 242 formed on the inner peripheral side of the large diameter connection pipe 240. The second flow path 22 is joined to a small diameter connection pipe flow path 252 formed on the inner peripheral side of the small diameter connection pipe 250. The branch flow path 33 is joined to the branch connection pipe flow path 232 formed on the inner peripheral side of the branch connection pipe 230.

In this embodiment, the piping structure 200 is used as a plumbing pipe for buildings such as apartment buildings such as apartments and office buildings such as an apartment, and extends vertically from the vertical pipe 205 and the vertical pipe 205 extending in the vertical direction. A plurality of branch connection pipes 230. Here, each of the plurality of branch connection pipes 230 constitutes a part of the plurality of horizontal pipes 206.
When water flows in the vertical pipe 205 from the bottom to the top, a pressure loss occurs. On the other hand, the branch connection pipe 230 is required to flow clean water having the same water pressure. Therefore, it is necessary to reduce the inner diameter of the vertical pipe 205 as it goes upward at every predetermined distance so that the internal pressure of the clean water is the same.

  The vertical pipe 205 includes a plurality of pipes 210a to 210d extending in the vertical direction of the building and a plurality of branch pipe joints connected to these pipes. The vertical pipe 205 further includes an elbow pipe joint 207 provided at the upper end of the vertical pipe 205. The plurality of branch pipe joints are divided into pipe joints 1x to 1z that connect the large-diameter connection pipe and the small-diameter connection pipe, and conventional branch pipe joints 100a to 100d that connect main pipes having the same diameter.

The plurality of tubes 210a to 210d are tubes having different inner diameters. The plurality of tubes 210a to 210d have different outer diameters. In addition, when using what has an outlet as shown in FIG. 4 as a branch pipe joint, you may use the pipe | tube which equips the end part with the receptacle which incorporated the electrofusion means as pipe | tube 210a-210d.
The plurality of tubes 210a to 210d are arranged in the vertical direction so that the inner diameter of the upper tube is the same as or smaller than the inner diameter of the lower tube.
A plurality of branch pipe joints for connecting the plurality of pipes 210 a to 210 d and connecting to the branch connection pipe 230 are used.

  In the present embodiment, the pipe joints 1x to 1z are any of the pipe joints 1 to 6 having functions of a branch pipe joint and a different diameter pipe joint. The pipe 210 a connected to the pipe joint 1 x corresponds to the large diameter connection pipe 240, and the pipe 210 b connected to the pipe joint 1 x corresponds to the small diameter connection pipe 250. The pipe 210b connected to the pipe joint 1y corresponds to the large diameter connection pipe 240, and the pipe 210c connected to the pipe joint 1y corresponds to the small diameter connection pipe 250. The pipe 210c connected to the pipe joint 1z corresponds to the large diameter connection pipe 240, and the pipe 210d connected to the pipe joint 1z corresponds to the small diameter connection pipe 250. On the other hand, the branch pipe joints 100a to 100c are conventional branch pipe joints in which the inner diameters of the upper and lower main pipes are the same.

Since all the branch connection pipes 230 have the same inner diameter and outer diameter, the branch flow paths 33 of the branch pipe portions 30 of the pipe joints 1x to 1z and the branch pipe joints 100a to 100c all have the same inner diameter. Have.
The branch connection pipe 230 on the top floor needs to have the same diameter as the other floors. The inner diameter d2 of the second flow path 12 and the inner diameter d3 of the branch flow path 33 must satisfy the inner diameter d2 of the second flow path 12 ≧ the inner diameter d3 of the branch flow path 33. In other words, all the pipe joints have a relationship of the inner diameter d1 of the first flow path 21 ≧ the inner diameter d2 of the second flow path 12 ≧ the inner diameter d3 of the branch flow path 33.

  When the piping structure 200 is installed in a building, a pipe joint having a function of a different diameter pipe joint, in which the inner diameter of the upper main pipe is smaller than the inner diameter of the lower main pipe, for connecting the plurality of pipes 210a to 210d. Since 1z to 1z are used, the number of times of pipe joint connection can be reduced in the entire piping installation work. Specifically, between the vertical pipes having different diameters, conventionally, at least two types of joints of a branch pipe joint and a different diameter joint are required. By using it, it can be connected by one type of joint.

  The above pipe joints 1 to 6 are all brought into buildings such as mid-to-high-rise apartment buildings and office buildings in a state where the vertical pipe and the horizontal pipe are not connected, and the pipe joint work is performed in the building. In the manufacturing factory that manufactured the pipe fittings 1-6, the pipe joint work in the factory to be connected to the vertical pipe or the horizontal pipe is performed in advance to produce the pipe joint with the pipe. You may bring it into the building.

  The pipe joints 1 to 6 include a main pipe section 20 having a first flow path 21, a second flow path 22, and a tapered flow path 23 that connects the first flow path 21 and the second flow path 22, and the main pipe section 20. And a branch pipe portion 30 having a branch flow path 33. The inner diameter d1 of the first flow path 21 at the first joint end 21c is the inner diameter of the second flow path 22 at the second joint end 22c. Since it is larger than d2, the pipe joints 1 to 6 have the functions of a different diameter pipe joint and a branch pipe joint, and the number of fusion operations can be reduced in the entire pipe installation work.

  In addition, in said embodiment, although the pipe joints 1-6 demonstrated the case where it used with respect to the vertical piping for waterworks of a building, it does not restrict to this. For example, even when connecting polyethylene gas pipes used for city gas distribution, it has the functions of different-diameter pipe joints and branch pipe joints. It can be shortened.

d1 Inner diameter d2 at the joining end of the first flow path Inner diameter 1, 2, 3, 4, 5, 6 at the joining end of the second flow path Fitting 20 Main pipe part 21 First flow path 21a First fitted part Opening 21b Contact surface 21c First joint end 22 Second flow path 22a Second fitted portion opening 21b Contact surface 22c Second joint end 23 Tapered flow path 30 Branch pipe section 33 Branch flow path 33c Branching Joint end portion 41 First fitting portion 41a First fitted portion 42 Second fitting portion 42a Second fitted portion 43 Branch fitting portion 50 Electric fusion means 51, 52 Electric terminals 53, 54 Electric heating element 60, 61, 62 Pipe fitting part 200 Piping structure

Claims (3)

A main pipe portion having a first flow path, a second flow path, and a tapered flow path connecting the first flow path and the second flow path;
A branch pipe section branched from the main pipe section and having a branch flow path,
A pipe joint in which an inner diameter at a joint end of the first flow path is larger than an inner diameter at a joint end of the second flow path.   The pipe joint according to claim 1, wherein the branch channel is branched from the first channel or the second channel. Including the pipe joint according to claim 1, a large-diameter connection pipe, a small-diameter connection pipe, and a branch connection pipe;
The first flow path is joined to a large diameter connection pipe flow path formed on the inner peripheral side of the large diameter connection pipe,
The second flow path is joined to a small diameter connection pipe flow path formed on the inner peripheral side of the small diameter connection pipe,
The said branch flow path is a piping structure joined to the branch connection pipe flow path formed in the inner peripheral side of the said branch connection pipe.

Images