JP4895069B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint, and more particularly to a double ring type pipe joint having a sealing ring and a retaining ring.

As shown in FIG. 4, the conventional double ring type pipe joint has a joint body 21, a sealing ring 26, a holding ring 27, and a cap nut 25.
When this pipe joint is connected to the pipe 13, a large amount of work is required to move the rings 26 and 27 simultaneously with the cap nut 25. In addition, the tightening degree of the cap nut varies from worker to worker, causing fluid leakage and the like.
In order to solve the above problems, for example, a pipe joint as shown in FIG. 5 is disclosed (Patent Document 1).
As shown in the figure, the pipe joint includes an annular opening for accommodating the pipe 13, an annular tapered surface 2 adjacent to the annular opening, and a radial end face 11 adjacent to the annular tapered surface 2. And a retaining ring 7, a sealing ring 8, and a pipe joint provided with a cap nut 5 that holds the retaining ring 7 and the sealing ring 8 by screwing and tightening the outer periphery of the coupling body 1. In
The holding ring 7 has cutting teeth that cut and hold the tube 13 that passes through the inside, and a nut engaging surface that engages with the cap nut 5.
The sealing ring 6 abuts against the end face 11 in the radial direction of the joint body 1 when the pipe joint is properly tightened with respect to the pipe 13, and stops the sealing ring 6 against the joint body 1. The first stop surface 10 and a portion having the incising teeth of the retaining ring 7 so that the incising teeth of the retaining ring 7 are slid forward and cut into the tube 13 when the cap nut 5 is tightened to the joint body 1. A conical sliding surface 14 that slidably accommodates, and a joint that extends adjacent to the first stop surface 10 and that does not cut into the pipe 13 when the pipe joint is properly squeezed against the pipe 13. A sealing lip 8 that is pressed between the annular tapered surface 2 of the main body 1 and the tube 13 to form a compression-type seal, and the retaining ring 7 in the radial direction when the tube joint is properly tightened to the tube 13. Abut against the stop surface 18a And a second stop surface 15a in the radial direction to stop the ring 7.

In the pipe joint shown in FIG. 5, when the cap nut is tightened, the movement of the sealing ring and the retaining ring hardly overlaps, so that it can be assembled with a small amount of work. In addition, when the pipe joint is properly tightened with respect to the pipe, the sealing ring comes into contact with the radial end surface of the joint body, and a radial first stop surface that stops the sealing ring with respect to the joint body; Since there is a second stop surface in the radial direction that comes into contact with the stop surface in the radial direction of the holding ring and stops the holding ring, the variation in tightening condition for each operator is improved as compared with the conventional case.
However, in the case of this conventional example, the cap nut is fastened to the joint main body via the sealing ring and the holding ring, so that the tightening degree varies somewhat for each worker.
An object of the present invention is to provide a pipe joint in which the tightening degree of the cap nut does not vary at all between workers when the pipe joint is connected to the pipe, and the holding ring is easily inserted into the pipe.

The pipe joint according to the invention comprises an annular opening for accommodating a pipe (13), an annular tapered surface (2) adjacent to the annular opening, and a radial end face adjacent to the annular tapered surface (2). (11) the coupling body (1), the retaining ring (7), the sealing ring (6), and the retaining ring (7) and the sealing ring by screwing and tightening to the outer periphery of the coupling body (1) A cap nut (5) for holding (6), and the holding ring (7) engages with the cap nut and the incision tooth for cutting and holding the tube (13) passing through the inside (7). And the sealing ring (6) is arranged on the radial end face (11) of the joint body (1) when the pipe joint is properly tightened to the pipe (13). A radial first abutting and stopping the sealing ring (6) against the joint body (1) When the stop nut (10) and the cap nut (5) are tightened to the joint body (1), the holding teeth of the holding ring (7) are slid forward to hold the pipe nut (13). A conical sliding surface (14) that slidably accommodates a portion of the ring (7) having incising teeth, and extends adjacent to the first stop surface (10), and the pipe joint is connected to the pipe (13). a pipe joint having a sealing lip (8) forming the pushed in compression-type seal between the annular tapered surface of the joint body (1) when properly tightened and (2) a tube (13) against ,
The cap nut (5) has an inner conical surface (16) that engages the retaining ring (7) and a radial stop surface (18) adjacent to the inner conical surface (16), The sealing ring (6) abuts against the radial stop surface (18) of the cap nut (5) when the pipe joint is properly tightened to the tube (13), and stops the cap nut (6). have a second stop surface in the radial direction (15) to further the a retaining ring (7) and the sealing ring (6), characterized in that contact only with the sliding surface of the conical (14).

Since the present invention is configured as described above, the following effects can be obtained.
(1) When connecting the pipe joint to the pipe, the tightening degree of the cap nut does not vary at all between workers.
(2) The range of selection of the shape and material of the retaining ring is widened, and the retaining ring can be easily inserted into the tube.
(3) Even when the material of the pipe is changed, it is easy to cope.

An embodiment of a pipe joint according to the present invention will be described with reference to the drawings.
FIG. 1 is an enlarged view of a main part of FIG. 2, and FIG. 2 is a partially longitudinal side view of a pipe joint according to the present invention, showing a final assembled state. Note that portions that are the same as or equivalent to those of the conventional example are described using the same reference numerals.
As shown in FIGS. 1 and 2, the pipe joint according to the present invention includes an annular opening for accommodating the pipe 13 up to the stopper 17, an annular tapered surface 2 adjacent to the annular opening, and the annular tapered surface 2. A joint body 1 having an end face 11 in the radial direction with respect to the axis 9 adjacent thereto and a male screw 3, a holding ring 7, a sealing ring 6, and a female screw 4 screwed into the male screw 3 of the joint body 1. By combining, the holding ring 7 and the cap nut 5 holding the sealing ring 6 are provided.
The holding ring 7 has cutting teeth that are cut and held in the pipe 13 that passes through the inside, and a nut engaging surface that engages with the cap nut 5.
The sealing ring 6 abuts against the end face 11 in the radial direction of the joint body 1 when the pipe joint is properly tightened with respect to the pipe 13, and stops the sealing ring 6 against the joint body 1. When the first stop surface 10 and the cap nut 5 are fastened to the joint main body 1, a portion having the incising teeth of the retaining ring 7 so that the incising teeth of the retaining ring 7 slide forward and cut into the tube 13. A conical sliding surface 14 slidably accommodated, and an annular tapered surface 2 of the joint body 1 and the tube 13 extending adjacent to the first stop surface 10 when the tube joint is properly tightened to the tube 13. And a sealing lip 8 which is pushed between the two to form a compression-type seal.
The cap nut 5 has an inner conical surface 16 that engages with a nut engaging surface of the retaining ring 7, and a radial stop surface 18 adjacent to the inner conical surface 16.
The sealing ring 6 abuts against the radial stop surface 18 of the cap nut 5 when the pipe joint is properly tightened with respect to the tube 13, and a second radial stop that stops the cap nut 13. It has a surface 15.
Since the holding ring 7 and the sealing ring 6 are in contact with each other only at the conical sliding surface 14, the selection of the shape and material of the holding ring is widened, and the holding ring can be easily inserted into the pipe. It becomes. In addition, it is easy to cope even when the material of the pipe is changed.

FIG. 3 is a view showing a state before the main pipe joint is assembled. The assembly operation of the pipe joint will be described with reference to this figure.
In the figure, the retaining ring 7 is fitted into the sealing ring 6 before assembly. At the time of assembly, the tube 13 is introduced through the cap nut 5, the holding ring 7, the sealing ring 6 and the sealing lip 8 to the stopper 17 in the joint body 1. When the cap nut 5 is tightened in this state, the inner conical surface 16 of the cap nut 5 is engaged with the nut engaging surface of the retaining ring 7, and thus the retaining ring 7 is engaged with the first stop surface 10 of the sealing ring 6. Until the stop surface 18 of the cap nut 5 abuts against the second stop surface 15 of the sealing ring 6, and the incising teeth of the retaining ring 7 are not easily inserted into the tube 13. . The assembly is completed when the stop surface 18 of the cap nut 5 abuts against the second stop surface 15 of the sealing ring 6.

FIG. 3 is an enlarged view of a main part of FIG. 2. It is a figure which shows a final assembly state in the partial longitudinal cross-sectional side view of the pipe joint of this invention. It is a figure which shows the state before the assembly of FIG. It is a vertical side view of the pipe joint of a prior art example. It is a partial vertical side view of the pipe joint of another conventional example, and is a view showing a final assembled state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,21 Joint body 2 Annular taper surface 3 Male thread 4 Female thread 5, 25 Cap nut 6, 26 Seal ring 7, 27 Holding ring 8 Sealing lip 9 Axis 10 First stop surface 11 End surface 13 Tube 14 Sliding surface 15, 15a Second stop surface 16 Inner conical surface 17 Stopper 18, 18a Stop surface

Claims (1)

A joint having an annular opening for receiving the tube (13), an annular tapered surface (2) adjacent to the annular opening, and a radial end surface (11) adjacent to the annular tapered surface (2) A body (1), a retaining ring (7), a sealing ring (6), and a bag for holding the retaining ring (7) and the sealing ring (6) by screwing and tightening to the outer periphery of the joint body (1) A nut (5), and the retaining ring (7) includes a cutting tooth that cuts and holds the pipe (13) that passes through the nut, and a nut engaging surface that engages with the cap nut (5). The sealing ring (6) abuts against a radial end face (11) of the joint body (1) when the pipe joint is properly tightened with respect to the pipe (13), and the joint body (1 First radial stop surface (10) for stopping the sealing ring (6) against When the cap nut (5) is fastened to the joint body (1), the incising teeth of the retaining ring (7) are slid forwardly and cut into the pipe (13). A conical sliding surface (14) that slidably accommodates a portion having slidable and extending adjacent to the first stop surface (10), and when the tube fitting is properly tightened to the tube (13) a pipe joint having a sealing lip (8) forming the pushed in compression-type seal between the annular tapered surface of the joint body (1) and (2) a tube (13),
The cap nut (5) has an inner conical surface (16) that engages the retaining ring (7) and a radial stop surface (18) adjacent to the inner conical surface (16), The sealing ring (6) abuts against the radial stop surface (18) of the cap nut (5) when the pipe joint is properly tightened to the tube (13), and stops the cap nut (6). have a second stop surface in the radial direction (15) to further the a retaining ring (7) and the sealing ring (6), pipes, characterized in that contacting the only sliding surface of the conical (14) Fittings.

Images