JPH0227749Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a pipe joint.

(Prior Art) Conventionally, as shown in FIG. 4, for example, the inner diameter of a synthetic resin pipe joint body 1' is gradually reduced from both ends to the middle part, and an annular projection 2' is formed in the middle part. There are pipe fittings that are

(Problem to be solved by the invention) In such a pipe joint, synthetic resin connected pipe 3'
is inserted from both ends and bonded with adhesive 4', but there is a gap or level difference between the annular projection 2' and the connected pipe 3', causing the flowing water to stagnate, causing bacteria to accumulate in that part. It has disadvantages such as causing the proliferation of water, making it unsuitable for piping for distributing pure water, ultrapure water, etc.

In view of the above-mentioned problems with conventional pipe joints, the present invention is designed to be used in pipes that flow pure water, ultrapure water, etc., without creating gaps or differences in level between the annular protrusion and the connected pipe. The purpose of the present invention is to provide a suitable pipe joint.

(Means for Solving the Problems) The gist of the present invention is that an annular projection having the same height as the thickness of the end of the pipe to be connected is provided in the middle part of the inner surface of the pipe joint body, and both sides of the annular projection A recessed portion is formed at the base of the pipe fitting, a protrusion is provided on the inner peripheral surface of the pipe fitting body at a position close to the annular projection, and an annular elastic body is abutted on both sides of the annular projection. The abutment surface for the protrusion has a protrusion that is fitted into the recess, the abutment surface for the connected pipe is provided with a bulge that becomes a flat surface when pressed, and the upper surface has a protrusion that fits into the recess. The pipe joint has a concave curved surface that becomes a flat surface when pressed by the pipe joint, and a concave strip into which the protrusion is inserted is formed on the lower surface.

(Function) As described above, the groove of the annular elastic body is fitted into the protrusion provided in the vicinity of the recess, so that the annular elastic body can be accurately positioned.

Further, both the bulging portion and the concave curved surface of the annular elastic body become flat surfaces due to the pressure of the connected pipe.

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

Reference numeral 1 denotes a pipe joint body made of synthetic resin, the inner diameter of which is gradually reduced from both ends to the middle part, and an annular projection 2 is provided in the middle part.

The annular projection 2 has the same height as the thickness of the end of the connected pipe 8, has recesses 3, 3 formed at the base of both sides, and has a flat top surface 4. It is said that Incidentally, protrusions 6, 6 are provided protrudingly on the inner circumferential surface of the pipe joint body 1 at a position close to the annular protrusion 2.

5 is an annular elastic body made of silicone rubber, fluororesin, or the like. A protrusion 7 is formed on the contact surface of the annular elastic body 5 to the annular protrusion 2, and the protrusion 7
is fitted into the recess 3 of the annular projection 2, and the annular elastic body 5 is positioned. A bulge 9 is formed on the abutting surface of the annular elastic body 5 with the connected tube 8 . The bulging portion 9 is made into a flat surface by the pressing force of the connected tube 8.

The upper surface of the annular elastic body 5 has a concave curved surface 10, and when the connected tube 8 comes into contact with the bulge 9 of the annular elastic body and the bulge 9 becomes a flat surface 12, the concave curve 1 is formed.
0 is a flat surface 13. Furthermore, a groove 11 is formed on the lower surface of the annular elastic body 5 into which the protrusion 6 is inserted. Annular elastic body 5
The protruding strip 6 is fitted into the grooved strip 11, and the annular elastic body 5 is positioned.

The pipes 8 to be connected are inserted from both ends of the pipe joint body 1 and joined together using an adhesive 14 . At this time, the tube end surface of the connected tube 8 comes into contact with the annular elastic body 5 and presses the annular elastic body 5, so that the concave curved surface 10 and the bulging portion 9 on the upper surface form flat surfaces 12 and 13.

In this way, the annular elastic body 5 comes into contact with the annular projection 2 and is locked, so that no gap is created between the annular projection 2 and the annular elastic body 5, and the pipe end surface of the connected pipe 8 comes into contact with the annular elastic body 5 so that no gap is created, and furthermore, no step is created between the connected pipe 8 and the annular protrusion 2.

(Effects of the invention) As described above, according to the pipe joint of the invention, the pipes to be connected are brought into contact with each other so as to press the annular elastic body to form a flat surface during connection, and the pipe end face and the annular elastic body are pressed against each other to form a flat surface. There is no gap between the contact surface and the contact surface.

The annular elastic body is pressed and abutted against the annular projection,
Since the protrusion is fitted into the recess and the groove is fitted into the protrusion, positioning is ensured.

Further, the height of the annular protrusion is made the same as the thickness of the pipe to be connected, and the concave curved surface of the annular elastic body becomes a flat surface by pressing, so that there is no difference in level.

According to the present invention, circulating water does not stagnate and bacteria do not grow in that area, so it is suitable for use in piping for pure water, ultrapure water, etc. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of the pipe joint of the present invention;
Fig. 2 is an enlarged vertical cross-sectional view of the main parts of the above, Fig. 3 is a longitudinal cross-sectional view of the same with connected pipes connected, and Fig. 4 is a conventional pipe joint, showing connected pipes. FIG. DESCRIPTION OF SYMBOLS 1... Pipe joint body, 2... Annular protrusion, 3... Recessed part, 5... Annular elastic body, 6... Projection, 7... Projection, 8... Connected pipe, 9... Expansion Part 10...
Concave curved surface, 11... Concave stripe, 12, 13... Flat surface.

Claims (1)

[Scope of utility model registration request] An annular projection having the same height as the thickness of the pipe end of the pipe to be connected is provided in the middle part of the inner surface of the pipe joint body, and recesses are formed at the bases of both sides of the annular projection,
A protrusion is provided on the inner peripheral surface of the pipe joint body at a position close to the annular projection, and an annular elastic body is abutted on both sides of the annular projection, and this annular elastic body has the above-mentioned recess on the contact surface to the annular projection. It has a protruding part that is fitted into the entry part,
The contact surface of the connected pipe is provided with a bulge that becomes a flat surface when pressed, the upper surface has a concave curved surface that becomes a flat surface when pressed by the connected pipe, and the lower surface has the protrusion. A pipe joint characterized in that a concave groove into which a groove is inserted is formed.