JPH029174Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention relates to a pipe joint in which a spout of one synthetic resin pipe is inserted into a socket formed at the end of the other synthetic resin pipe and joined by adhesive. .

(Conventional technology) Conventionally, when bonding synthetic resin pipes together,
A pipe joint called a TS joint, as shown in a half-sectional view in Figure 3, is used.

To briefly explain the configuration of this pipe joint based on the same figure, one synthetic resin pipe 1' has a socket at one end.
1', and the inner periphery of the socket 11' is formed with a tapered surface whose diameter increases toward the open end. This tapered surface is formed so that the inner diameter at a position approximately 1/3 from the opening end is equal to the outer diameter of the other synthetic resin pipe 2', and the other synthetic resin pipe 2' is connected to the socket 11'. When connecting the spout 21', apply a pipe joint to the outer peripheral surface of the spout 21', and force the spout 21', which has been softened by the solvent action of the adhesive, into the socket 11'. It was glued together.

(Problem to be solved by the invention) However, in the case of this conventional joint, when the spigot 21' is press-fitted into the socket 11', as shown by the two-dot chain line in the drawing, There was a problem in that a recess was formed between the stopper wall of the holder and the tip of the spigot 21', and foreign matters were deposited in the recess. Therefore, in order to eliminate this recess, it is necessary to bring the tip of the spout 21' into contact with the stopper wall at the back of the socket 11', but in this case, the tip of the spout 21 has to be thick. Because it is difficult to reduce the diameter, excessive stress is generated on the shoulder 110' of the socket 11', and when vibrations, shocks, etc. are applied to the pipe, the shoulder 110' may be damaged.

Further, when the spigot 21' is press-fitted into the socket 11', there is a problem in that the tip of the spigot 21', which has a reduced diameter, protrudes toward the inner circumferential side of the tube and obstructs the flow of fluid within the tube.

These problems can be solved, for example, by forming the same taper surface on the outer circumference of the socket as the inner circumference of the socket, as proposed in Japanese Utility Model Application Publication No. 59-75986. If the tip of the spout contacts the stopper wall at the back of the socket before the tapered surface of the spout and the tapered surface of the socket fit together, a strong joint may not be obtained, or vice versa. A new problem arises in that a recess is formed between the tip of the mouth and the stopper wall.

The present invention solves all of the above-mentioned problems, and provides a pipe joint that can firmly adhesively bond synthetic resin pipes to each other and that does not create steps, unevenness, etc. on the inner circumferential surface of the joint. It is something.

(Means for Solving the Problems) The present invention is a pipe joint in which a spout is inserted into a tapered socket with a diameter expanded to adhesively join synthetic resin pipes. A stopper wall is provided, and an inclined surface whose diameter increases toward the socket is formed on the inner periphery on the back side of the stopper wall. On the other hand, the inner circumference of the spout is formed with an inclined surface whose diameter increases toward the pipe end, and the tip of the spout has a reduced diameter when adhesive is applied to the outer circumferential surface of the spout and the spout is press-fitted into the socket. It is characterized in that the stopper wall contacts the stopper wall so that the sloped surface on the inner periphery on the back side of the stopper wall is continuous with the sloped surface on the inner periphery of the spigot.

(Function) When the spigot is press-fitted into the socket, the tip of the spigot, which has been softened by the adhesive, follows the tapered surface of the socket and contracts in diameter, causing the tip of the spigot to close to the stopper at the back of the socket. The inclined surface formed on the inner periphery of the stopper wall in contact with the wall and the inclined surface formed on the inner periphery of the spigot are flush and continuous.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 and 2 are longitudinal sectional views showing one embodiment of the present invention, in which FIG. 1 is a sectional view showing a state in which a spigot is connected to a socket, and FIG. 2 is a sectional view showing a state where a spigot is connected to a socket. FIG. 3 is a sectional view showing a state before connection.

Reference numerals 1 and 2 in the figure are synthetic resin tubes made of vinyl chloride resin, polyethylene resin, polybutene resin, etc., and both tubes 1 and 2 have the same inner and outer diameters. One synthetic resin pipe 1 has a socket 11 at one end, and the inner peripheral surface of the socket 11 is formed with a tapered surface whose diameter increases toward the opening side. The tapered surface is formed so that the inner diameter at a position approximately ⅓ from the open end is equal to the outer diameter of the other synthetic resin pipe 2. A stopper wall 12 is provided at the back of the socket 11 and is perpendicular to the tube axis, and an inclined surface 13 whose diameter increases toward the socket 11 is formed on the inner periphery of the stopper wall 12 on the back side.

The end of the other synthetic resin pipe 2 is a spout 21 inserted into the socket 11, and an inclined surface 22 is formed on the inner periphery of the spout 21, the diameter of which increases toward the open end. The inclined surface 22 can be set as appropriate depending on the diameter of the synthetic resin pipe 2, but when the spigot 21, which has been softened by applying adhesive to the outer peripheral surface of the spigot 21, is press-fitted into the socket 11, It is important that the tip of the socket 21 has an inclined surface that reduces in diameter following the tapered surface of the socket 11 and has a wall thickness that presses against the inner circumferential surface of the socket 11 with an appropriate repulsive force. . Generally, the wall thickness t of the spout tip with respect to the wall thickness T of the synthetic resin pipe 2 is as follows:
It is preferable to set the length L to be larger than 0.5 mm and smaller than T/2, and to make the length L of the inclined surface 22 almost equal to the length of the socket 11.

On the other hand, the inclined surface 13 on the inner periphery of the back side of the socket 11 is such that the inclined surface 22 and the inclined surface 13 are flush with each other when the tip of the spigot 21 is reduced in diameter and comes into contact with the stopper wall 12. It is important to form them so that they are continuous.

In this way, the inclined surface 13 is formed on the inner circumference of the back side of the socket 11.
When the spigot 21 is press-fitted into the socket 11 and the slanted surface 22 is formed on the inner periphery of the spigot 21 and the spigot 21 coated with adhesive is press-fitted into the socket 11, the two are firmly adhesively bonded. However, the inclined surfaces 13 and 22 of the joint are flush and continuous. Furthermore, even if some adhesive protrudes from between the tip of the spout 21 and the stopper wall 12 at the back of the socket, the inner peripheral surface of the joint between the two will expand in diameter due to the inclined surfaces 13 and 22. Because
The protruding adhesive does not protrude from the inner peripheral surfaces of the synthetic resin pipes 1 and 2.

(Effects of the invention) As detailed above, in the present invention, an inclined surface is formed on the inner periphery of the back side of the socket, and an inclined surface is formed on the inner periphery of the spigot inserted into the socket. When the spigot coated with the spigot is press-fitted into the socket, the tapered surface of the inner periphery of the socket and the outer periphery of the spigot are pressed together with moderate force, and the two are firmly adhesively bonded. In addition, since the inclined surface on the inner circumference on the back side of the socket and the inclined surface on the inner circumference of the spigot are flush with each other, there is no possibility that the fluid in the pipe will stagnate at the joint, or that impurities will accumulate and bacteria will occur. .

Therefore, the pipe joint of the present invention can be suitably used as a pipe joint for ultrapure water equipment for cleaning electronic components such as ICs and condensers.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional views showing one embodiment of the present invention, in which FIG. 1 is a sectional view showing a state in which a spigot is connected to a socket, and FIG. 2 is a sectional view showing a state where a spigot is connected to a socket. FIG. 3 is a half-sectional view of a conventional joint. 1, 2...Synthetic resin pipe, 11...Socket, 12...
...stopper wall, 13...slanted surface, 21...socket, 22...slanted surface.

Claims (1)

[Scope of utility model registration request] In a pipe joint in which synthetic resin pipes are adhesively joined by inserting a spout into a socket whose diameter has expanded in a tapered shape, a stopper wall is provided at the back of the socket and is substantially orthogonal to the pipe axis, and a stopper wall is provided at the back of the stopper wall. The inner periphery is formed with an inclined surface whose diameter increases toward the socket side, while the inner periphery of the spigot is formed with an inclined surface whose diameter increases toward the tube end, and the outer periphery of the spigot is formed with an inclined surface whose diameter increases toward the pipe end. When applied with adhesive and press-fitted into the socket, the tip of the spout, which has a reduced diameter, comes into contact with the stopper wall, and the sloped surface on the inner periphery on the back side of the stopper wall is continuous with the sloped surface on the inner periphery of the spout. A pipe joint characterized by the following.