JPH01182694A - Pipe fitting - Google Patents

Abstract

PURPOSE:To make the connected angle of a pipe body variably adjustable in an easy manner by forming each of butting end faces of the pipe body into an almost circular incline angled with a virtual cutting plane perpendicular to the axis. CONSTITUTION:Each of butting end faces 101, 202 of pipe bodies 1, 2 is formed into an almost circular incline with angles theta1, theta2 to virtual cutting planes (A), (B) perpendicular to respective axes O1, O2. Accordingly, these butting end faces 101, 201 as each rotational surface whereby each connected angle of these pipe bodies 1, 2 can be variably adjusted.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a pipe joint that connects pipe bodies by variably adjusting the connection angle. By making the slope at an angle to the surface and variably adjusting the connection angle by rotating the abutting end surface relatively as a rotating surface, the step between the tubes at the connection part can be made as small as possible, and the tubes can be The connection angle can be easily adjusted.

<Prior Art> This type of pipe fitting is necessary for changing the direction of piping. As a conventional pipe joint of this kind, a universal pipe joint is known, in which spherical joint parts are provided at the ends of a pair of pipe bodies, and these spherical joint parts are fitted into each other.

<Problems to be solved by the invention> However, in conventional universal pipe joints, a step occurs at the joint due to the wall thickness of the pipe, etc., and the difference becomes an obstacle to the flow of fluid passing through the pipe. There have been problems such as smooth flow being obstructed, mixtures and floating substances contained in the fluid adhering to stepped portions, causing flow obstruction, and adhering parts rotting and emitting bad odors. Furthermore, since universal joints are not easy to mold, the cost of the product increases.

Means for Solving the Problems> In order to solve the above-mentioned conventional problems, a pipe joint according to the present invention includes a pair of pipe bodies that are connected by abutting one end surface in the axial direction, and Each of the end faces is a substantially circular slope having an angle with respect to an imaginary cut plane perpendicular to the axis, and the connecting angle is variably adjusted by relatively rotating the abutting end face as a rotating surface.

Each of the abutting end surfaces of the pair of tubes is a substantially circular slope with an angle to the imaginary cut plane perpendicular to the axis, so the pair of tubes can be rotated using the abutting end surfaces as rotation surfaces. When rotated relative to each other, the pair of tubes swings at a solid angle corresponding to the amount of rotation and the inclination angle of the butt end surfaces about the rotation axis perpendicular to the butt end surfaces, and the connection angle changes. .

Therefore, the connection angle of the tube can be variably adjusted according to the relative rotation angle and the inclination angle.

Since the pair of tubes are connected by the substantially circular abutting end surfaces, unlike conventional universal joints, there is no difference in level caused by the wall thickness of the tubes at the connecting portion. Therefore, problems such as flow obstruction due to the step at the connecting portion, adhesion of floating objects to the step, and flow obstruction due to this are less likely to occur.

Even if the inclination angles of the butt end surfaces of a pair of tubes are the same,
May be different. When the inclination angles are the same, a connection angle that swings in one direction can be obtained with respect to the axis of one tube body, and when they are made different, a connection angle that can swing in both directions can be obtained.

When the cross sections of a pair of tubes are circular, and when each of the abutting end surfaces of the tubes is an inclined surface having an angle with respect to an imaginary cut plane perpendicular to the axis, the abutting end surfaces generally have an elliptical shape. In the case of elliptical butt end faces, depending on the rotation angle, the long axis direction of one butt end face will match the short axis direction of the other butt end face, and the length of the long sleeve and short axis will be the same at the butt part. A step is created due to the difference. This level difference can be reduced to a substantially negligible level by selecting the inclination angle of the abutting end surfaces so that the abutting end surfaces can be regarded as substantially circular. A more effective means is to process or mold the abutting end faces into a circular shape. Thereby, it is possible to obtain a pipe joint that does not create a step between the abutting end faces due to a difference in the mouth shape.

The larger the inclination angle of the butt end faces, the larger the deviation of the solid angle between the pair of tubes, and the wider the variable range of the connection angle, but the more oval the cut, and the more difficult it is to process or mold. Circularization correction becomes difficult. Therefore, it is desirable to select the size of the inclination angle within a range that can be made circular by processing and molding.

<Example> Fig. 1 is a cross-sectional view of a pipe joint according to the present invention, Fig. 2 is a cross-sectional view along lines A and -A in Figs.
B, sectional view on the line.

In the figure, 1 and 2 are a pair of tube bodies having a circular cross section. The tube 1.2 can be made of any material such as plastic, metal, etc. These pipe bodies 1.2 may themselves be pipe bodies constituting piping, or may be pipe bodies dedicated to joints inserted and connected between pipes. These tube bodies 1.2 are connected with one end face 101.201 in the direction of the axes o1, o2 abutting against each other. Each of the butt end surfaces 101 and 201 has a virtual cutting surface (a) perpendicular to the axis 01.02,
The slopes have angles θ1 and θ2 with respect to (b). In this example, the angles θ1 and θ2 are each approximately 15
It is selected from time to time. The abutting end surfaces 101 and 102 are formed into a circular shape by processing, molding, or the like.

When abutting the butting end surfaces 101 and 201, the tube body 1
Here, a ring-shaped connecting portion 102 is provided that stands up and projects perpendicularly from the outer periphery of the abutting end surface 101 in the direction of the axis o1, and the tube body 2 is provided with a connecting portion 202 that fits into the connecting portion 102, and the tip of this connecting portion 202 is provided. A butting end surface 201 is formed on the surface. Each of the tubes 1.2 has an abutting end face 1.
01. Cylindrical part 1 into which external piping can be fitted on the opposite side from 201
03.203 is established.

In the pipe joint having the above structure, the butt end surface 101.201
When the tubular bodies 1.2 are relatively rotated with .
It swings at a solid angle ω corresponding to the inclination angles θl and θ2 of 1.201, and its connection angle changes.

First, when the tubes 1 and 2 are connected as shown by the solid line in FIG. 1, the axes o1.02 of the tubes 1.2 are on the same line, and the connection angle is β. =180 degrees. If the tube body 2 is rotated, for example, to the right from this state, the axis o2 of the tube body 2 will change while drawing a circular locus with a radius Rθ centered on the rotation axis n, as shown in FIG. do. Figures 4 to 6 show rotation angles of 90 degrees and 1
This figure shows the position of the tubular body 2 at 80 degrees and 270 degrees, and it can be seen that the connection angle of the tubular body 2 to the tubular body 1 changes depending on the rotation angle. The position where the connection angle is minimum is the 180 degree rotation position shown in FIG. The connection angle β+mln (see FIG. 1) at this position is β1n=180 degrees−(θ1+02)2150 degrees. By changing the inclination angles θ3 and θ2, the minimum connection angle βi can be obtained. Needless to say, this will change.

Note that the rotation of the tube 1.2 is relative, and the rotation of the tube 1.2 is relative.
The same goes for rotating the .

In the embodiment, since the abutting end surfaces 101 and 201 are circular, the abutting end surfaces 1
01.201, there is no step difference due to the difference in mouth shape. Therefore, it is possible to solve problems such as flow obstruction due to a step in the connecting portion, adhesion of floating objects to the step, and flow obstruction caused by this.

Further, in the embodiment, since the inclination angles θ1 and θ2 are made to match each other, a connection angle swinging in one direction with respect to the axis o1 of the tubular body 1 can be obtained. Furthermore, in the embodiment, since the inclination angles θ5 and θ2 are relatively small at 15 degrees, the degree of the elliptical shape of the cut of the abutting end surfaces 101 and 201 is reduced, making it easy to circularize by machining or molding.

FIG. 7 shows another embodiment of the pipe joint according to the present invention. In this embodiment, an O-ring 3 is provided on the outer periphery of the connecting portion 202 of the tubular body 2 that fits into the connecting portion 102 of the tubular body 1 . The O-ring may be provided on the inner peripheral side of the connecting portion 102. In another embodiment, the abutting end face 10 of the tube 1.2
A flange connection in which 1.201 is formed by a flange is also considered.

<Effects of the Invention> As described above, the present invention includes a pair of tube bodies that are connected by abutting one end face in the axial direction, and each of the abutting end faces is at an angle with respect to a virtual cut plane perpendicular to the axis. The connecting angle is variably adjusted by relatively rotating the abutting end face as a rotating surface, so that the step portion that occurs between the pipe bodies at the connecting part can be made as small as possible. Therefore, it is possible to provide a pipe joint in which the connection angle of the pipe body can be easily and variably adjusted.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a pipe joint according to the present invention, Fig. 2 is a sectional view along line A, -A in Fig. 1, and Fig. 3 is a sectional view on the line B1-A in Fig. 1.
A sectional view taken along line B1, FIGS. 4 to 6 are diagrams for explaining the function of the pipe joint according to the present invention, and FIG. 7 is a sectional view of another embodiment of the pipe joint according to the present invention. 1.2... Pipe bodies 101, 201... Butt end faces Fig. 6

Claims (1)

[Claims] A pair of tube bodies are connected by abutting one end surface in the axial direction, each of the abutting end surfaces is a substantially circular slope having an angle with respect to a virtual cut plane perpendicular to the axis, and the abutting end surface is rotated. A pipe joint characterized by variably adjusting the connection angle by rotating the surfaces relatively.