JPS626388Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a pipe joint, and in particular to a pipe joint for water and sewage systems.

BACKGROUND ART FIG. 1 shows a T-shaped pipe joint in which a connecting tube 2 is provided protruding from the side surface of a pipe joint body 1. Such pipe joints are used, for example, in drainage pipes of high-rise residential buildings, and the pipe joint body 1
is connected to the vertical pipe (main pipe) 3, and the connecting pipe 2
is connected to the horizontal pipe (branch pipe) 4 on each floor.

Problems to be Solved by the Invention In high-rise residential buildings using pipe joints such as those described above, there is a problem in which a portion of the drainage water from the upper floors flowing down the pipe joint body 1 flows back into the toilet bowls and the like on the lower floors.

This problem is thought to be due to the following causes. That is, if the flow of the main body 1 flowing down along the opening of the connecting tube 2 falls as indicated by the broken line arrow a, the above-mentioned backflow will not occur. However, in reality, as shown by the solid arrow b, it turns around to the connecting tube 2 side and separates from the upper wall surface at an angle θ that corresponds to the speed of the flow. The angle θ increases as the flow speed increases, so the flow flowing down from the upper floor bounces off the bottom of the connecting pipe 2 and flows into the horizontal pipe 4.
flow back inside. This phenomenon is called a water jump phenomenon, and can be confirmed experimentally.

The purpose of this invention is to prevent backflow caused by the water splash phenomenon described above.

Means for Solving the Problem This invention forms a protrusion along the periphery of the opening of the connecting cylinder to the pipe joint body on the upstream side of the flow in the main body, and The side surface is formed into an inclined surface protruding toward the center of the main body, and the surface on the upstream side of the flow inside the connecting tube is formed into an inclined surface protruding toward the center of the connecting tube, and the top of the protrusion is formed at an acute angle. It has a configuration in which it is formed into a shape.

Embodiment As shown in FIG. 2, the pipe fitting according to the embodiment of this invention is basically the same as the conventional one, with a connecting tube 2 protruding from the side surface of the pipe fitting body 1 in a T-shape. It is something. The difference from the conventional one is the connecting tube 2.
At the opening 5 to the main body 1 (see FIG. 3), a protrusion 6 is formed along the upstream periphery of the main body 1 over half the circumference. The height of this protrusion 6 decreases toward both ends, and is formed so as to disappear at both ends. Moreover, as can be seen from the case of FIG. 1 (indicated by a chain line in FIG. 2), this protrusion 6 has a surface 6a that diagonally faces the upstream side of the main body 1 and a surface 6a that diagonally faces the upstream side of the connecting tube 2. It has a top section with an acute angle in cross section. One side 6a
has an inclination that protrudes toward the center of the main body 1 along the flow direction, and the other surface 6b has an inclination that protrudes toward the center of the connecting tube 2 along the flow direction.

Since the pipe joint of the embodiment has the above-mentioned configuration, of the flow flowing down the main body 1, the flow c along the opening 5 is caused by the fact that the top of the protrusion 6 is pointed at an acute angle, and that the connection Since the surface 6b on the side of the cylinder 2 is tilted in the opposite direction, the flow does not go around to the side of the surface 6b. Therefore, no water jumping phenomenon occurs.

It should be noted that if the protrusion 6 is placed on the upstream periphery of the opening 5, a nearly satisfactory result can be obtained, but if it is provided over half the circumference on the upstream side as shown in Fig. 3, it will be more secure. It is possible to prevent crowding.

Effects of the invention As described above, this invention has the effect of preventing the problem of the flow inside the pipe joint body flowing back into the connecting tube.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional pipe joint, Fig. 2 is a cross-sectional view of an embodiment of the pipe joint of this invention, and Fig. 3 is a cross-sectional view of a conventional pipe joint.
It is a sectional view taken along the - line in the figure. DESCRIPTION OF SYMBOLS 1... Pipe joint body, 2... Connection tube, 5... Opening, 6... Protrusion, 6a, 6b... Surface.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a pipe joint in which a connecting tube is provided protruding from the side surface of a pipe fitting body, along the upstream periphery of the opening of the connecting tube relative to the pipe fitting body, The upstream side of the flow in the main body of the protrusion is formed into an inclined surface protruding toward the center of the main body, and the upstream side of the flow in the connecting cylinder is formed at the center of the connecting cylinder. A pipe joint characterized in that it is formed into an inclined surface protruding in the direction, and the top of the protrusion is formed into an acute angle shape. (2) The above-mentioned protrusion is formed over the upstream half of the periphery of the opening, and the height of the protrusion gradually decreases from the upstream side to the downstream side, and disappears at both ends. A pipe joint according to claim 1 of the utility model registration claim, characterized in that: