JPH0348475Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a pipe joint that can easily connect synthetic resin pipes, has excellent watertightness, and has high resistance to pulling out. be.

(Prior Art) Conventionally, as a pipe joint for connecting flexible synthetic resin pipes such as polyethylene, for example,
In Publication No. 16915, an annular packing is attached to the inner peripheral surface, a threaded portion is provided on the outer peripheral surface of the end, and a cap nut holds a tightening split ring and is loosely screwed into the male threaded portion. Insert a synthetic resin pipe with a cylindrical core with a concave groove on its outer circumferential surface into the end of the tube into the connection base tube, and tighten the cap nut to reduce the diameter of the tightening split ring. It is described that a part of the resin pipe is deformed and inserted into the annular groove of the cylindrical core.

(Problem to be solved by the invention) However, in the case of the above-mentioned pipe joint, the annular packing must be compressed in order to obtain excellent watertightness, and for this purpose, for example, the inner diameter of the annular packing must be It is necessary to make the outer diameter smaller than the outer diameter of the resin pipe, and therefore, when inserting the synthetic resin pipe, it is impossible to avoid the annular packing from slipping out of the annular groove. If the annular packing comes off the groove, watertightness cannot be guaranteed.

(Means for Solving the Problems) In view of the above-mentioned drawbacks, the present invention provides a pipe joint that can be easily connected, has excellent watertightness, and has a large resistance to pulling out. The gist of the above is to have a cylindrical guide part into which a connecting pipe is inserted at least at one end, an annular groove is provided on the outer periphery of the end of the guide part, an annular packing is attached to the annular groove, and the packing is provided with an annular groove. The pipe fitting body has an outer diameter smaller than the outer diameter of the guide section near the groove, and a plurality of notches are provided in the axial direction at the tip, and the tip of the cutout is opposite to the annular groove. The pipe joint body is arranged concentrically around the guide part of the pipe joint body so as to be able to prevent rotation relative to the pipe joint body so as to be positioned facing toward the pipe joint body, and forms a space between the guide part and the guide part into which the connecting pipe can be inserted. A tightening ring is fitted onto the outer periphery of the tightening ring, and by pressing the tip of the notch of the tightening ring to reduce the diameter, the pipe wall of the connecting pipe near the notch is shaped like the annular shape of the guide section. The pipe joint consists of a cap nut that is deformed into a concave groove.

(Function) In the pipe joint of the present invention, a groove is currently provided on the outer periphery of the end of the guide portion of the pipe joint body, an annular packing is attached to this groove, and the tip of the notch of the tightening ring is connected to the annular groove. is arranged concentrically around the guide part so as to be able to prevent rotation with respect to the pipe joint body so as to be located opposite to the guide part, and to maintain a space between the guide part and the tightening ring so that the connecting pipe can be inserted. When the connecting pipe is inserted and the tightening ring is tightened with a cap nut, the diameter of the notch end of the tightening ring is reduced, deforming the connecting pipe into the annular groove, and tightening the tightening ring with the cap nut. Since the annular packing is compressed and deformed, watertightness is good, and since the connecting pipe is deformed into the annular groove, the connecting pipe is prevented from slipping out from the guide portion.

(Embodiment) An example of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway vertical sectional view showing an example of the pipe joint of the present invention.

Reference numeral 1 designates a pipe joint body, which has a cylindrical guide portion 11 on one side into which a connecting pipe is externally inserted, and a connecting portion 12 connected to a device such as a valve on the other side, and is located approximately at the center of the pipe joint body 1. A nut portion 13 having a square shape, for example, a hexagonal shape is provided. An annular groove 111 is provided on the outer periphery of the end of the guide portion 11 on the side where the connecting pipe is inserted.

The shape of the annular groove 111 may be a rectangular or semicircular shape other than the inverted trapezoid shape shown in the figure, and its depth depends on the thickness of the guide portion 11, but the depth is 1 of the thickness of the connecting pipe. It is best to set it to around /2. The outer diameter of the guide portion 11 is preferably approximately equal to or slightly smaller than the inner diameter of the connecting pipe.

2 is a tightening ring, which includes a collar portion 21 and a cylindrical portion 22.
It is composed of. The outer surface of the collar portion 21 is made into a square shape, for example, a hexagonal shape, so that a tightening tool such as a spanner can be hooked thereto, while the inner surface of one end portion of the collar portion 21 can be fitted into the nut portion 13 of the pipe joint body 1. This corresponds to the shape of the nut portion 13 as shown in FIG.

A plurality of notches 221 are provided at the distal end of the cylindrical portion 22 in the axial direction, and the diameter of the distal end of the cylindrical portion 22 is reduced inward by a pressing force from the outside. A threaded portion 222 is provided on the outer periphery between the notch portion 221 and the flange portion 21 . Cylindrical part 22
The inner diameter of the connecting pipe is preferably approximately equal to or slightly larger than the outer diameter of the connecting pipe. The length of the cylindrical part 22 is such that the tip of the notch part 221 faces the position of the annular groove 111 provided on the outer periphery of the guide part 11 of the pipe joint body 1.

The tightening ring 2 has a collar portion 21 fitted into the nut portion 13 and is arranged concentrically around the guide portion 11 of the pipe joint body 1 so as to prevent rotation, and the outer surface of the guide portion 11 and the inner surface of the cylindrical portion 22 A gap is formed between which a connecting pipe can be inserted.

3 is a cap nut, and the cylindrical portion 2 is attached to the inner periphery of the end.
A female threaded portion 31 is provided which is screwed into the male threaded portion 222 of No. 2, and a tapered portion 32 whose diameter decreases as it goes toward the back is provided in the inner part of the female threaded part 31, which has an inner diameter smaller than the outer diameter of the connecting pipe. A small diameter portion 33 having a slightly larger diameter is provided. The flange 21 of the tightening ring 2 is then fitted into the nut 13 of the fitting body 1, and the connecting pipe is inserted between the guide portion 11 of the fitting body 1 and the cylindrical portion 22 of the tightening ring 2. A possible gap is formed, and the female threaded portion 31 of the cap nut 3 is partially screwed into the male threaded portion 222 of the cylindrical portion 22 to form a pipe joint.

Reference numeral 5 denotes an annular packing, which is attached to an annular groove 111 of the guide portion 11.

As shown in FIG. 2, the annular packing 5 has a substantially Z-shaped cross section, but it may also be circular, square, oval, or the like. The outer diameter of the annular packing 5 is smaller than the outer diameter of the guide portion 11 near the annular groove 111.

Therefore, unlike conventional pipe joints, no large force is required to insert the connecting pipe 4 into the guide section 12, and the annular packing 5 does not come off the annular groove 111 during insertion. . Further, the annular packing 5 is tightened at the tip of the cylindrical portion 22 to reduce its diameter,
Since it is compressed by the pipe wall of the connecting pipe 4 that deforms into the annular groove 111, better watertightness can be obtained.
In particular, if the cross-sectional shape of the annular packing 5 has a self-sealing property as shown in Fig. 2, if the connecting pipe 4 is used for piping that supplies hot water of 80°C or higher, for example, flow will occur. Even if it is a synthetic resin pipe, the annular packing 5 has self-deformability due to internal water pressure, so a decrease in watertightness can be prevented. Next, a mode of use of the embodiment of the present invention shown in FIG. 1 will be explained with reference to FIG. 3.

After screwing the connecting part 12 of the pipe joint main body 1 of the pipe joint prepared as shown in FIG. 11 and the cylindrical portion 22 of the tightening ring 2, and when the cap nut 3 is screwed into the male threaded portion 222 of the cylindrical portion 22, the cylindrical portion 22 multiple notches 211 of
The tapered portion 32 of the cap nut 3 has a tip provided with a
is pressed inward and the diameter is reduced. Therefore, the outer periphery of the connecting tube 4 is tightened uniformly at the tip of the cylindrical portion 22 and its diameter is reduced, and the tube wall of the connecting tube 4 near the notch portion is deformed into the annular groove 111 and tightened, thereby forming an annular shape. The annular packing 5 installed in the groove is compressively deformed to form a sealing portion that is excellent in watertightness and has a large resistance to pulling out.

As in the embodiment shown in FIG. By making the outer diameter of the connecting pipe 4 slightly larger than the outer diameter of the connecting pipe 4, the tightening ring 2 is prevented from rotating around the pipe joint body 1 even when the cap nut 3 is screwed and fitted, and the inner surface of the cap nut 3 is not connected. Since there is no contact with the outer surface of the pipe 4, the connection work can be performed without twisting the end of the connecting pipe 4.

The present invention is not limited to having a cylindrical guide part at one end as shown in FIG. 1, but may have guide parts at both ends or three or more ends. The shapes of pipe joints are bund,
Of course, it may be made of cheese, cloth, etc.

(Effects of the invention) The pipe joint of the present invention is constructed as described above, and has a cylindrical guide part provided with an annular groove with an annular packing attached to the outer periphery of the end. In this case, a tightening ring having a plurality of notches at its tip is arranged concentrically with the guide part so as to form a gap into which the connecting tube can be inserted, so that the connecting tube cannot be deformed. Insertion work can be done without any trouble. Further, the tip of the notch of the tightening ring is arranged so as to face the annular groove, and the tip of the notch is pressed and reduced in diameter by a cap nut fitted on the outer periphery of the tightening ring. Since the pipe wall of the connecting pipe in the vicinity of the notch is deformed into the annular groove, it has excellent watertightness and a large resistance to pulling out.

Furthermore, as described above, since the pipe wall of the connecting pipe is deformed into the annular groove to provide watertightness and prevent slippage, the outer diameter of the annular packing is made smaller than the outer diameter of the guide portion near the annular groove. Furthermore, the diameter of the guide portion may be smaller than the inner diameter of the connecting pipe. Therefore, the connecting tube can be easily inserted into the guide portion, and the annular packing is not pushed out from the annular recessed groove at the distal end of the connecting tube and pushed deep into the connecting tube during insertion.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway longitudinal sectional view showing an example of the pipe joint of the present invention, Fig. 2 is a partially cutaway longitudinal sectional view showing an enlarged annular packing, and Fig. 3 is the same as shown in Fig. 1. FIG. 2 is a partially cutaway vertical cross-sectional view showing a state in which a synthetic resin pipe is connected to a pipe joint. 1... Pipe joint body, 11... Guide section, 111...
...Annular groove, 12...Connecting pipe, 13...Nut part, 2...Tightening ring, 21...Flame part, 22...
Cylindrical part, 221... Notch part, 222... Male threaded part, 3... Fitting member, 31... Female threaded part, 32...
... Tapered part, 33 ... Small diameter part, 4 ... Connection pipe, 5
...Annular packing.

Claims (1)

[Scope of utility model registration request] It has a cylindrical guide part at least on one end of which the connecting pipe is inserted, an annular groove is provided on the outer periphery of the end of the guide part, an annular packing is attached to the annular groove, and the outer diameter of the packing is The pipe fitting body has a diameter smaller than the outer diameter of the guide portion near the groove, and a plurality of notches are provided in the axial direction at the tip, and the tip of the notch faces opposite to the annular groove. a tightening ring that is arranged concentrically around the guide part of the pipe joint body so as to be able to prevent rotation with respect to the pipe joint body, and forms a space between the guide part and the guide part through which the connecting pipe can be inserted; is fitted onto the outer periphery of the tightening ring, and by pressing the tip of the notch of the tightening ring to reduce the diameter, the pipe wall of the connecting pipe near the notch is fitted into the annular groove of the guide section. A pipe joint consisting of a deformable cap nut.