JPH0712696U - Pipe fitting with cast screw - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pipe joint which has good casting quality and is easily screwed. A main body 11 having a swelling portion 12 and a tapered pipe portion 13 formed in a lower portion of the swelling portion 12, an upper standpipe connection port 15 provided in an upper portion of the body 11, and a lower portion of the body 11. The lower standpipe connection port 18 provided, the lateral branch pipe connection port 20 provided on the side surface of the main body 11, the inner pipe 25 provided below the upper standpipe connection port 15, and the inner pipe 25 projectingly formed. And a swivel guide 28 formed so as to project from the taper pipe portion 13.
5, at least one of the lower vertical pipe connection port 18 and the lateral branch pipe connection port 20 is provided with the connection round screw portion 16 cast by the vanishing model.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drainage pipe joint, and more particularly to a pipe joint having a cast screw.

[0002]

[Prior art]

 Conventionally, at the upper and lower vertical pipe connection ports or horizontal branch pipe connection ports of drainage pipe joints, screw type or cap nuts in which the upper and lower drainage vertical pipes, horizontal branch pipes, etc. are directly screwed into the connection ports. A connection method is used in which a pipe is tightened by screwing into the connection port.

The screw threads in these connection methods are generally triangular thread-shaped threads threaded by machining, and a round screw cast using a green sand mold is used in part. .

[0004]

[Problems to be solved by the device]

 However, in a pipe joint with such a conventional structure, the number of threads per unit length is large, for example, 11 threads / inch (25.4 mm), in the case of a machined threaded pipe joint. However, the pipe or cap nut must be turned many times to tighten them, which causes a problem in working in a narrow space. In addition, the threaded portion may become rusted over time and eventually corrode, causing drainage leaks.

Further, in a pipe joint having a round screw formed by green sand mold casting, sand may not reach the details of the round screw part at the time of mold forming, and it becomes a cavity, resulting in swelling in a cast product. In addition, there was a problem that flashing occurred on the parting surface of the mold, resulting in frequent poor quality of cast products.

The present invention has been made in view of the above, and an object thereof is to provide a pipe joint having a casting screw having a good casting quality and having an easy screw connection. It is a thing.

[0007]

[Means for Solving the Problems]

 The present invention has been made to achieve the above object. The first invention is to form a bulging portion having a diameter larger than that of the drainage stack and a downward tapered shape at the lower portion of the bulging portion. A main body having a tapered pipe portion, an upper standpipe connection port provided at an upper part of the body, a lower standpipe connection port provided at a lower part of the body, and at least a side surface of the main body. One horizontal branch pipe connection port, an inner pipe hanging downward from the upper stand pipe connection port, a deceleration guide projectingly formed on an inner peripheral wall of the inner pipe, and the tapered pipe portion. And a swirl guide projectingly formed on the inner peripheral wall of the at least one of the upper vertical pipe connecting port, the lower vertical pipe connecting port, and the lateral branch pipe connecting port are cast by a vanishing model. Pipe joint having a cast screw, characterized by comprising a round thread for connection. It is.

A second invention is a main body having a swelling portion having a diameter larger than that of the drainage stack and a taper pipe portion formed in a downward tapered shape at a lower portion of the swelling portion, and an upper portion of the body. An upper vertical pipe connecting port provided on the main body, a lower vertical pipe connecting port provided on a lower portion of the main body, and at least one lateral branch pipe connecting port provided on a side surface of the main body. At least one of the upper vertical pipe connecting port, the lower vertical pipe connecting port, and the lateral branch pipe connecting port is provided with a round thread portion for connection cast by a vanishing model. It is a pipe joint having.

A third invention comprises a straight tubular main body, an upper connection port provided at an upper part of the main body, and a lower connection port provided at a lower part of the main body, wherein the upper connection port and the lower connection port are provided. At least one of the connection ports is a pipe joint having a cast screw, characterized in that the connection round screw portion is cast by a vanishing model.

A fourth invention comprises a curved tubular body, an upper connection port provided at an upper part of the body, and a lower connection port provided at a lower part of the body, wherein the upper connection port and the lower connection port are provided. At least one of the connection ports is a pipe joint having a cast screw, characterized in that the connection round screw portion is cast by a vanishing model.

[0011]

[Action]

 The present invention is configured as described above, and the upper vertical pipe connecting port, the lower vertical pipe connecting port, the side branch pipe connecting port, or the connecting round screw portion of the upper connecting port and the lower connecting port are connected to each other. It is connected to the round screw provided on the pipe connected to the mouth or the round screw of the cap nut by screw pairing.

[0012] Further, the connection round screw portion is cast by the disappearance model to avoid the occurrence of swelling and flash and maintain good casting quality, and the casting surface of the connection round screw portion has corrosion resistance. Prevents drainage leaks over a long period of time.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 7 show a pipe joint having a cast screw according to a first embodiment of the present invention.

A pipe joint having a casting screw indicated by reference numeral 10 in the drawing (hereinafter abbreviated as pipe joint 10) is provided on a main body 11 having a bulging portion 12 and a tapered pipe portion 13, and is connected to the main body 11 at an upper portion thereof. Upper standpipe connection port 15 provided with a round screw portion 16 for use, a lower standpipe connection port 18 provided at a lower portion of the main body 11 and provided with a round screw portion 19 for connection, and a round connection pipe provided on a side surface of the main body 11 for connection. Horizontal branch pipe connection ports 20 and 20 provided with a threaded portion 21, an inner pipe 25 provided below the upper stand pipe connection port 15, a deceleration guide 26 provided on an inner wall surface of the inner pipe 25, and a taper. The turning guide 28 provided on the inner peripheral wall of the pipe portion 13 is provided.

The main body 11 includes a cylindrical expansion part 12 having an inner diameter larger than that of the upper drainage stack pipe 31, and a tapered conical-tube part 13 that is tapered downward from the lower end part of the expansion part 12. It is formed from and.

The upper drainage vertical pipe connection port 15 is provided in the upper part of the main body 11 sharing the pipe axis of the pipe joint 10, and is provided with a round threaded portion 16 in the shape of a rounding screw on the inner peripheral side thereof. As shown in FIG. 3, the round thread portion 16 has a thread and a trough of the female thread formed in an arc shape. In the practical example, four threads / 1 inch (25.4 mm) female thread is threaded. Has been done. In the embodiment, the radius R of the arc of the peak and the valley is set to 0.25597 pitches on the mountain side and 0.22 105 pitches on the valley side. At the lower end of the upper drainage stack 31, a connecting male thread (not shown) is formed to be paired with the round threaded portion 16.

The lower standpipe connection port 18 is provided in the lower part of the taper pipe portion 13 of the main body 11 so as to extend downward in a straight pipe shape, and is provided with a round male screw-shaped round screw portion 19 on the outer peripheral side thereof. As shown in FIG. 4, the round threaded portion 19 is formed such that the cross section of the thread ridge and the trough of the male thread is formed in an arc shape, and 4 threads / 1 inch (25.4 mm) of male thread is threaded. The half radius R of the arc is set to 0.23851 pitch on the mountain side and 0.23851 pitch on the valley side. At the upper end of the lower drainage stack 33, a connecting round screw (not shown) is formed which is paired with the round screw portion 19.

The lateral branch pipe connection port 20 is formed on the side surface of the expanded portion 12 of the main body 11 so as to open laterally so as to directly intersect the pipe axis of the pipe joint 10. The lateral branch pipe connection port 20 is provided with a round male thread-shaped round threaded portion 21 on the outer peripheral side thereof, and the round threaded portion 21 is formed in the same manner as the round threaded portion 19 described above. The cap nut 36 for tightly connecting the lateral branch pipe 35 is formed with a connection rounding screw (not shown) that is screw-paired to the round screw portion 21.

The inner pipe 25 is formed in a half-cylindrical shape and hangs down inside the main body 11 below the upper stand pipe connection port 15 and substantially faces the inner openings of the side branch pipe connection ports 20 and 20. It is set up.

The deceleration guide 26 is formed in the shape of a segment of a circle, and projects downward by inclining from the inner peripheral wall of the inner pipe 25, and the protruding end edge inclines leftward downward (downward leftward in FIG. 6). It is set up. Then, the drainage flowing in from the upper vertical pipe connection port 15 is configured to impede the flow down to the lower side to reduce the speed, and change the course to give a preliminary turning property.

The swivel guide 28 is formed so as to project from the taper pipe portion 13 on the side facing the deceleration guide 26 with the pipe axis of the pipe joint 10 interposed therebetween, and rises from the upper portion of the taper pipe portion 13 to connect the lower stand pipe. It is formed as an arcuate projecting portion that converges on the inner wall surface at the upper part of the mouth 18. The protruding end edge of the swivel guide 28 is formed in a straight line from the upper part to the lower part, and is provided so as to be inclined downward to the right (downward in FIG. 6) in the length direction thereof. The protruding edge is formed substantially parallel to the protruding edge of the deceleration guide 26 in the view of FIG.

Then, the deceleration guide 26 accurately receives the drainage flow provided with the preliminary swirl property, and causes it to flow down along the inner peripheral wall of the tapered pipe portion 13 while imparting the counterclockwise swirl property. The drainage flow is decelerated and guided into the lower vertical pipe connection port 18. Further, the drainage flowing in from the lateral branch pipe connection ports 20, 20 is formed so as to hit the inner pipe 25, scatter, and drop into the taper pipe portion 13.

The pipe joint 10 having the casting screw configured as described above is cast by a vanishing model for casting made of foamed polyethylene.

This disappearance model for casting is, for example, an expansion / expansion part 12 of the pipe joint 10, an upper stand pipe connection port 15, an inner pipe 25, an expansion / expansion part forming die corresponding to the deceleration guide 26, a tapered pipe part 13, a swirl part. Dividing into a taper pipe part forming die corresponding to the rotation guide 28, a lower stand pipe connecting port forming mold corresponding to the lower stand pipe connecting port 18, and a side branch pipe connecting port forming mold corresponding to the side branch pipe connecting port 20. At the polymorphic connection port, casting round threaded portions corresponding to the round threaded portions 16, 19 and 21 are formed. Then, the respective molding dies are individually molded and then joined and integrated.

When the pipe joint 10 is cast by this disappearance model, when the disappearance model is handled, for example, even if the round thread portion is chipped or the like, it appears as a notch (dent) in the product. No blistering or flashing occurs. The cast notch of the cast pipe joint 10 can be screwed into the round threaded portion of the upper drainage stack 31 or the like and connected without causing any trouble in screwing.

FIG. 7 shows an example of how the pipe joint 10 is used in a building having a thick hollow slab 38. In the figure, the pipe joint 10 on the upper side of the hollow slab 38 and the pipe joint 10 on the same side are connected by a straight tubular pipe joint 40 described later.

A round male screw at the lower end of the upper drainage vertical pipe 31 is screwed into the round threaded portion 16 of the upper vertical pipe connection port 15 of the upper pipe joint 10 and is connected to the lower vertical pipe connection port 18. The round threaded portion 19 of the pipe joint 40 is connected to the round threaded portion 19 by screwing the round threaded portion 46 of the upper connection port 45. As a result, the lower standpipe connection port 18 of the upper pipe joint 10 is substantially extended by the pipe joint 40 through the through hole 39 to the lower side of the hollow slab 38. Therefore, the lower pipe joint 10 and the pipe joint 40 can be connected on the lower side of the hollow slab 38, and the connection work of the upper and lower pipe joints 10 and 10 of the hollow slab 38 can be spared. It can be done in a certain space.

At the side branch pipe connection port 20 of each pipe joint 10, a side branch pipe 35 is screwed into the round thread portion 21 of the pipe joint 10, and a round screw of a cap nut 36 is screwed through an annular seal member to tighten the side branch pipe 35. Connecting. In addition, a round screw at the upper end of the lower drainage vertical pipe 33 is screwed into the round threaded portion 19 of the lower vertical pipe connection port 18 of the lower pipe joint 10 for connection. Since the number of threads by the round screw is small, the screwing operation in the round threaded portions 16, 19 and 21 requires less rotation for screwing, and the operation can be performed easily and quickly.

FIG. 8 shows another embodiment of the present invention, which is characterized by a simple structure. In the following embodiments, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

A pipe joint 10A having a cast screw according to the second embodiment includes a main body 11 having an expanded portion 12 and a tapered pipe portion 13, an upper stand pipe connection port 15 having a connecting round screw portion 16, A lower vertical pipe connection port 18 having a connecting round threaded portion 19, lateral branch pipe connection ports 20A and 20A having side opening and a connecting round threaded portion 21A, and an upwardly opening connecting round screw And a lateral branch pipe connection port 20B including a portion 21B.

The round threaded portions 21A and 21B are formed in the same manner as the round threaded portion 16 of the first embodiment. The horizontal branch pipes 35A, 35B connected to the horizontal branch pipe connection ports 20A, 20B are formed by providing round threaded portions (male threads) for screw connection to the round threaded portions 21A, 21B, respectively.

FIG. 9 shows a third embodiment of the present invention, which is characterized by the configuration of a straight tubular body.

A pipe joint 40 having a cast screw according to the third embodiment has a straight tubular main body 41, an upper connection port 45 provided at an upper portion of the main body 41 with a round screw portion 46, and a lower end of the main body 41. And a lower connection port 48 having a round threaded portion 49.

The round screw portion 46 is formed similarly to the round screw portion 16 of the first embodiment, and the round screw portion 49 is formed similarly to the round screw portion 19.

According to this pipe joint 40, for example, as shown in FIG. 7, the pipe joint 40 is connected to another pipe joint, and the position of the connection port of the other pipe joint is moved substantially upward or downward. It is possible to secure a wide working space and connect it to other drainage pipes and pipe joints.

10 to 13 show a fourth embodiment of the present invention, which is characterized by a curved tubular structure.

A pipe joint 50 having a cast screw according to the fourth embodiment includes a curved tubular main body 51, an upper connection port 55 provided at an upper end portion of the main body 51 with a round screw portion 56, and a lower portion of the main body 51. And a lower connection port 58 having a flange portion 59 provided at the end portion. The round threaded portion 56 is formed in the same manner as the round threaded portion 16 of the first embodiment, and the axis of the upper connection port 55 and the axis of the lower connection port 58 are formed so as to be orthogonal to each other at an angle of 90 degrees. There is. Reference numeral 52 is a cleaning port, which is always closed by a lid 53 via a packing. In the pipe joint 50, for example, as shown in FIG. 13, the upper drainage vertical pipe 31 is screwed and connected to the upper connection port 55, and the lower drainage pipe 63 is connected to the lower connection port 58 via the packing. A tightening flange 64 provides a tight connection.

According to the pipe joint 50, even when the pipe joint 50 is connected in the through hole 39 of the slab 38, the connecting work can be easily performed. The lower connection port 58 may be formed with a round thread portion similar to the round thread portion 49 of the lower connection port 48 of the pipe joint 40. Further, in FIG. 13, a pipe joint 40 may be interposed between the upper drainage stack 31 and the pipe joint 50.

In addition, it is desirable that the above-mentioned round threaded portions are subjected to rust preventive coating, and thus, in addition to the high corrosion resistance of the casting surface of the rounded threaded portion by casting, it is required to have further excellent corrosion resistance. You can

[0041]

[Effect of device]

 As explained above, according to the pipe joint having the cast screw of the present invention, the connection round screw portion cast by the disappearance model is provided at the connection ports of the upper and lower drainage vertical pipes and the side branch pipes. With this configuration, it is possible to avoid defects due to the occurrence of blistering and flash, and to form a good round threaded portion.

Since the number of threads per unit length is small, the drainage pipe can be connected more quickly and the space is narrower than that of a machined screw thread. Can easily perform the work.

In addition, it has a high corrosion resistance of the casting surface of the round screw part by casting, can prevent drainage leakage for a long period of time, and has higher durability than the drainage pipe connection of the tightening flange type using packing. be able to.

Furthermore, by combining straight pipe fittings, it is possible to easily obtain a neck fitting suitable for a thick slab.

[Brief description of drawings]

FIG. 1 is a front view of a pipe joint having a casting screw according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged cross-sectional view of part A in FIG.

FIG. 4 is an enlarged sectional view of a B part in FIG.

5 is an enlarged cross-sectional view taken along the line CC of FIG.

6 is an enlarged cross-sectional view taken along line DD of FIG.

FIG. 7 is a cross-sectional view showing a mode of use of the pipe joint of the first embodiment.

FIG. 8 is a front sectional view of a pipe joint according to a second embodiment.

FIG. 9 is a front sectional view of a pipe joint of the third embodiment.

FIG. 10 is a front view of the pipe joint of the fourth embodiment.

11 is a plan view of FIG.

12 is a sectional view taken along line EE of FIG.

FIG. 13 is a sectional view showing a mode of use of the pipe joint of the fourth embodiment.

[Explanation of symbols]

 10, 10A Pipe joint 11 Main body 12 Expanded portion 13 Tapered pipe portion 15 Upper vertical pipe connection port 16, 19 Round screw portion 18 Lower vertical pipe connection port 20, 20A, 20B Horizontal branch pipe connection port 25 Inner pipe 26 Deceleration guide 28 Swivel guide 40 Pipe joint 41 Main body 45 Upper connection port 46,49 Round screw part 48 Lower connection port 50 Pipe joint 55 Upper connection port 56 Round screw part

Claims (4)

[Scope of utility model registration request] 1. A main body having a swelling portion having a diameter larger than that of the drainage stack and a taper pipe portion formed in a downward tapered shape at a lower portion of the swelling portion, and provided on an upper portion of the body. An upper standup pipe connection port, a lower standup pipe connection port provided at a lower portion of the main body, at least one lateral branch pipe connection port provided at a side surface of the main body, and a lower portion of the upper standpipe connection port. An upper pipe connecting port, which includes an inner pipe provided in a hanging shape, a reduction guide formed on an inner peripheral wall of the inner pipe, and a swivel guide formed on an inner peripheral wall of the tapered pipe portion. And a lower standpipe connection port and at least one connection port of the side branch pipe connection port, which is provided with a round thread portion for connection cast by a vanishing model. 2. A main body having a swelling portion having a diameter larger than that of the drainage stack and a tapered tube portion formed in a downward tapered shape at a lower portion of the swelling portion, and provided on an upper portion of the body. An upper stand pipe connection port; a lower stand pipe connection port provided at a lower portion of the main body; and at least one lateral branch pipe connection port provided at a side surface of the main body; And a lower standpipe connection port and at least one connection port of the side branch pipe connection port, which is provided with a round thread portion for connection cast by a vanishing model. 3. A straight tubular main body, an upper connection port provided at an upper portion of the main body, and a lower connection port provided at a lower portion of the main body, wherein at least the upper connection port and the lower connection port are provided. A pipe joint having a casting screw, wherein one connection port is provided with a connection round screw portion cast by a vanishing model. 4. A curved tubular main body, an upper connection port provided at an upper part of the main body, and a lower connection port provided at a lower part of the main body, wherein at least the upper connection port and the lower connection port are provided. A pipe joint having a casting screw, wherein one connection port is provided with a connection round screw portion cast by a vanishing model.