JPH0914535A - Compression pipe joint - Google Patents

Abstract

PURPOSE: To provide a pipe joint which can be applied in no relation to a pipe thickness by eliminating necessity for work chamfering a cut end face of a connection pipe to be provided with a means of accurately detecting an end point position of the connection pipe in a main unit. CONSTITUTION: In a pipe joint having an external thread 43 screwed to an internal thread 14 of a main unit 10 to be provided with a tightening nut 40 for inserting a connection pipe 35, an annular packing 20 of squared section brought into contact with a pipe end 36, an O ring 18 in contact with a connection pipe peripheral surface 37 and a pipe end detecting means water-tightly provided with a protruding/sinking pin 26 having a notched recessed part 28 and a conical half unit 27 in the tip end on a packing contact surface 21 are provided in the main unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression pipe joint used for connecting water supply / drainage or hot water supply piping.

[0002]

2. Description of the Related Art The applicant of the present invention has previously proposed that a female screw portion and a tapered surface are formed in a joint main body, and a holding pipe that is fitted into the pipe is provided so as to face the connecting pipe to be inserted. A joint main body having a detecting means for detecting the insertion of the connecting pipe, and a tapered portion provided at the tip of a tubular nut member for inserting the connecting pipe into the joint main body, and a male screw and an axial direction on the cylindrical surface. A compression pipe joint consisting of a tightening nut provided with a slit has been proposed (JP-A-7-27264). This joint is designed to be watertight by tightly adhering the inner wall of the connecting pipe to the outer periphery of the holding pipe, so that it is necessary to chamfer the inner surface of the connecting pipe tip and is not suitable for on-site work. It was uneconomical to prepare the joint body. In addition to this, it was revealed that cold water and hot water could cause water leakage due to repeated water flow. Furthermore, the pipe insertion detecting means adopted for the joint is
This is a retractable pin with a frusto-conical tip at the tip, and because it was not provided at the pipe end stop position due to the structure of the joint, there was a dead zone between the tip of the pin and the flat portion at the tip. It was incomplete because the pipe end position could not be detected accurately.

[0003]

The present invention does not require machining of the cut end surface of the connecting pipe, and can be applied regardless of the wall thickness or the inner diameter if the outer diameter of the connecting pipe is a specified value, and the tip position of the connecting pipe can be changed. It is intended to provide a compression pipe joint that can be reliably detected and pipe connection work can be performed. Further, the present invention provides an excellent pipe joint capable of maintaining a sealing property by adapting to a change in pipe diameter due to cold heat.

[0004]

A pipe joint of the present invention is provided with a tapered male screw for attachment at one opening end and a female screw portion at the other opening end and a wedge pressure having a smooth inner surface adjacent to the female screw portion. A fastening ring receiving step portion and an O-ring accommodating step portion are continuously provided, and an annular packing that abuts on a pipe end surface of a connecting pipe is fixed to a back portion of the O-ring accommodating step portion and a pipe end abutment of the annular packing. A conical half having a through hole formed in the outer radial direction of the surface and having a notched concave portion for receiving the outer peripheral surface of the annular packing at the inner end portion and a top portion for contacting the outer surface of the distal end of the connecting pipe inside the through hole. The wedge main body has a joint body in which a retractable pin having a body is attached through a seal packing, a pressing end surface that comes into contact with an O-ring inserted in the O-ring accommodating portion, and a tapered inner surface. The wedge clamp ring to be inserted into the step portion and the wedge clamp ring Is made consists of a cylindrical tightening nut slit having a female screw screwed to the male thread of the fitting body with the tip of the tapered portion in sliding contact with the tapered surface.
In the present invention, the annular packing in the main body has a rectangular cross section and a flat surface, and can be fitted and held on the outer periphery of the guide portion projecting in the main body. It is effective as a joint for synthetic resin pipes that the fitting guide portion is made thick and extended to form a holding pipe. It can also be formed so that a predetermined tightening torque can be obtained when the inner end surface of the tightening nut comes into contact with the outer end surface of the female thread, and a biting protrusion is formed on the inner surface of the cylindrical portion of the tightening nut. You may.

[0005]

The present invention will be described with reference to the drawings. 10 is a joint body, 11 is a pipe line, 12 is a taper screw threaded to a water supply header, 13 is an open end at the other end, 14 is a female screw, and 15 is a smooth surface. , 16 is a wedge pressure ring receiving step portion, 17 is an O ring receiving step portion, and 18 is an O ring. Reference numeral 20 is a heat-resistant rubber packing having a rectangular cross section, 21 is a tube contact surface, and 22 is an outer peripheral surface. Reference numeral 23 is a packing guide portion that is provided so as to project in the main body. Reference numeral 25 is a through hole having a central axis on the packing contact surface 21. Reference numeral 26 denotes a retractable pin for detecting a pipe end, which has a conical half body 27 at the tip and a notched recess 28 on the back surface thereof.
The shaft 29 is made of elastic rubber 31 and seal packing 3
2. The washer 33 is watertightly fitted in the through hole.
Reference numeral 30 denotes an upper end protruding portion. 35 is a connecting pipe, 36 is a pipe end,
37 is an outer peripheral surface and 38 is an inner surface. Reference numeral 40 denotes a tightening nut, and a tubular portion 42 through which the connecting pipe is inserted is continuously provided in the opening 41. Reference numeral 43 is a male screw provided on the outer periphery of the body of the tubular portion, 44 is a tapered surface formed at the tip, 45 is the tip, 4
Reference numeral 6 denotes a biting protrusion formed on the inner surface of the distal end side of the tubular portion in the circumferential direction, and 47 is a slit provided in the axial direction.
~ 4 formed. 50 is a wedge pressure ring,
It is provided with an O-ring pressing end surface 51 and a pressing taper surface 52.

The pipes are connected with the pin 26 pushed down as shown in FIG. In this state, the notched recess 28 of the pin is in contact with and supported by the outer peripheral surface 22 of the packing, and the conical half body 27 is located in front of the contact surface of the packing. Tightening nut 4
The connection pipe 35 in which 0 is inserted is inserted into the main body. Pipe end 36
When the pin comes into contact with the conical half 27 of the pin and further advances, the pin is completely pushed up by the action of the tapered surface, and the upper end 30 of the pin projects out of the main body so that it can be easily sensed even in the dark. The arrival at the contact surface 21 of the packing is detected. A strong water tightness is secured between the shaft portion of the retractable pin and the inner surface of the through hole by the compression of the elastic rubber 31 and the packing 32. The same applies when the shaft portion 29 of the protruding / retracting pin is not a stepped shaft but a tapered shaft having the same diameter or a diameter that gradually decreases upward, and the packing 32 is an O-ring.
Next, when the nut 40 is tightened, the tip end taper surface 44 of the tubular portion is
With the action of the tapered surface 52 of the wedge ring 50, the tubular portion with slit 42 advances while pressing the tube, pressing the tube end 36 against the contact surface 21 of the packing and the end surface 51 of the wedge ring 50 with the O-ring. 18 and push the O-ring to the outer surface 3
Adhere to 7.

The above-mentioned joint has a sealing function on the pipe end surface and the pipe outer peripheral surface, and in particular, the flat surface of the annular packing is in contact with the pipe end, so that the pipe end is not required to be reamed and the pipe meat It can be used regardless of the thickness. That is, when the connecting pipe is a metal pipe such as a copper pipe, if the outer diameter is specified, the same sealing property is exhibited regardless of the wall thickness. Further, even if the pipe diameter is reduced by cold water or the like, the contact surface of the packing is retained. Since the top of the conical half of the retractable pin is always in contact with the pipe end in the normal state, it can be used as a means for confirming the pipe end position.

FIG. 5 shows a joint which is suitable for connecting a synthetic resin pipe such as a poly pipe, in which the packing guide portion 23 is made thick and extended to form a holding pipe 60. Holding tube outer peripheral surface 61
Is closely fitted to the inner surface 38 of the connecting tube, the tube end 36 abuts almost the entire packing abutting surface 21, and the tube outer peripheral surface 37 abuts the O-ring 18. In this case, it goes without saying that the biting protrusion 46 formed on the inner surface of the distal end of the tubular portion of the tightening nut 40 has a shape that does not damage the outer peripheral surface of the tube.

[0009]

[Effect] The joint of the present invention exerts a sealing function by pressing the pipe end of the connecting pipe against the side flat surface of the annular packing, so that when the connecting pipe is a metal pipe, the holding pipe is not required and the inner surface of the pipe end is not required. In addition to eliminating the need for chamfering work, it has the advantage that it can be applied regardless of the wall thickness of the pipe. Even if the connecting pipe is a synthetic resin pipe, the other structure can be made common only by extending the holding pipe. Further, since the pipe end detection means is provided as a retractable pin having a sharpened tip located on the flat contact surface of the packing, the pipe end can be accurately detected, and the pipe connection work becomes reliable and easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the present invention joint for metal pipes.

FIG. 2 is a plan view of a tightening nut.

FIG. 3 is an enlarged cross-sectional view of a pipe end detecting means in a state where a connecting pipe is inserted.

FIG. 4 is an enlarged cross-sectional view of a pipe end detection unit before insertion of a connection pipe.

FIG. 5 is a sectional view of the joint of the present invention for a synthetic resin pipe.

[Explanation of symbols]

 10 Joint Main Body 16 Wedge Clamping Ring Receiving Step 17 O-Ring Receiving Step 20 Packing 21 Pipe End Abutment Surface 22 Outer Perimeter 23 Packing Guide 25 Through Hole 26 Ejection Pin 27 Cone Half 28 Notch Recess 35 Connection Pipe 36 Pipe End 40 Tightening nut 42 Cylindrical part 50 Wedge compression ring 52 Tapered surface 60 Insertion holding tube

Claims (2)

[Claims] 1. A tapered male screw for mounting is provided at one opening end, and a female screw portion at the other opening end, and a wedge ring clamping ring step portion having a smooth inner surface adjacent to the female screw portion and an O-ring. The accommodating step portion is continuously provided, an annular packing that abuts the pipe end surface of the connecting pipe is fixed to the inner portion of the O-ring accommodating step portion, and the annular packing is transparent in the outer radial direction of the tube end abutting surface. A hole is formed in the through hole, and a retractable pin having a conical half body having a notched concave portion for receiving the outer peripheral surface of the annular packing at its inner end and a top half for contacting the outer surface of the tip of the connecting pipe is sealed. A wedge main body having a joint main body mounted via packing, a pressing end surface for contacting an O-ring inserted in the O-ring accommodating portion, and a tapered inner surface, and being inserted in the wedge pressure ring receiving step portion. The compression ring and the taper portion that slides on the tapered surface of the wedge compression ring. A compression pipe joint comprising a tubular tightening nut with a slit, which is provided at the tip and has a male screw that is screwed into the female screw of the joint body. 2. A tapered male screw for mounting is provided at one opening end, and a female screw portion at the other opening end and a wedge ring clamping ring receiving portion having a smooth inner surface adjacent to the female screw portion and an O-ring. A holding pipe inserted into the connection pipe, in which a housing step portion is continuously provided, and an annular packing that abuts against a pipe end surface of the connection pipe is provided to project into the inner part of the O-ring storage step portion so as to face the connection pipe. A through hole is formed in the outer radial direction of the tube end abutting surface of the annular packing and is fixed to the base portion, and a notch recess for receiving the outer peripheral surface of the annular packing at the inner end is formed in the through hole. A joint body in which a retractable pin having a conical half body having a top portion that comes into contact with the outer surface of the distal end of the connecting pipe is attached via a seal packing, and a pressing force that comes into contact with an O-ring inserted in the O-ring accommodating portion. It has an end surface and a tapered inner surface, and is inserted into the wedge pressure ring receiving step portion. A compression composed of a wedge pressure ring and a slit-type tubular tightening nut having a tapered portion at the tip which is slidably in contact with the tapered surface of the wedge pressure ring and having a male screw screwed with a female screw of the joint body. Pipe fittings.