JP2000266252A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly prevent the leakage of water by improving sealing performance between a connecting pipe and a pipe joint, and permit smoothly inserting the connecting pipe into the pipe joint without giving a special working to a tip end of the connecting pipe. SOLUTION: A pipe joint A can be connected to a joint body 1 by forming a male tread 7 at one end of the nearly cylindrical joint body 1, arranging a split ring 15 between a cap nut 11 screwed with the male thread 7 and the joint body 1, and inserting a resin connecting pipe 19 from an opening 14 of the cap nut 11 to make the split ring 15 press a circumferencial surface of the connecting pipe 19. The joint body 1 is provided with a cylindrical guiding portion 8 externally fitted with the connecting pipe 19 on the inside of the male thread 7, and the guiding portion 8 is formed with a slot 9 on an outer peripheral surface opposing to the split ring 15, and a sealing member 10 tightly contacted with an inner peripheral surface of the connecting pipe 19 is equipped in the slot 9. Furthermore, in the slot 9 formed on the joint body 1, the sealing member 10 tightly contacted with the circumferencial surface of the connecting pipe 19 is equipped, and the sealing member 10 is provided with a tilt surface 10a wherein a diameter in an inserting direction of the connecting pipe 19 becomes a large diameter on a part that extend off the slot 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting synthetic resin pipes for water supply and hot water supply.

[0002]

2. Description of the Related Art Conventionally, there are plug-in type pipe joints shown in FIGS. 6 and 7 which can be connected simply by inserting synthetic resin pipes for water supply, hot water supply, etc. and are not easily pulled out. . 6 and 7 will be briefly described.
A passage 33 through which hot and cold water passes passes through the inside of the joint body 32 of the pipe joint 31, and a male screw part 35 and a cylindrical guide part having a smaller diameter than the male screw part 35 are provided at the other end of the connecting part 34 connected to another joint. 36, a sealing member 37 for sealing is mounted on the inner peripheral surface of the external thread portion 35, and a nut 3 provided separately is provided.
8, a female screw portion 39 screwed to the male screw portion 35 is formed inside, a split ring 40 is interposed between the nut 38 and the joint body 32, and the split ring 40 forms a slit in the axial direction, A tapered surface 41 and a biting groove 42 are formed on the inner peripheral surface.

Accordingly, after the nut 38 is screwed into the male screw portion 35 of the joint body 32, a polyethylene connection pipe 43 having a tapered portion 44 at the tip is inserted into the nut 38, and as shown in FIG. When the connecting pipe 43 is fitted to the outside of the guide portion 32, the connecting tube 43 is sandwiched between the guide portion 36 and the split ring 40 so as not to come out.

In the above, the pipe joint and the connecting pipe are sealed by a sealing member mounted on the fitting body, and the sealing member is in close contact with the outer peripheral surface of the connecting pipe. Since it is exposed, foreign matter easily adheres, and since this foreign matter adheres to the sealing member, it cannot be reliably sealed, and there is a risk of water leakage.

When the connecting pipe is connected to the pipe joint, its tip is chamfered by a tool so that the part protruding from the peripheral surface of the seal member mounted on the inner peripheral surface of the joint body can be smoothly passed over and inserted. However, if the length of the connecting pipe is changed according to the site where the pipe joint is to be installed, the end of the connecting pipe is cut off and then the tool is chamfered again to form a tapered part. And the workability was poor.

Further, even if the connection pipe is intended to be inserted all the way to the end of the pipe joint, it cannot be confirmed whether or not the connection pipe has been completely inserted. There was a risk of detaching from the joint or leaking water.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to improve the sealing performance between a connecting pipe and a pipe joint in a pipe joint which can be connected simply by inserting a resin connecting pipe. It is to prevent water leakage.

Another object of the present invention is to provide a pipe joint which can be connected simply by inserting a connection pipe made of resin, so that the connection pipe can be inserted smoothly without any special processing at the end thereof.

A further object of the present invention is to make it possible to externally check whether or not a connection pipe is correctly inserted into a pipe joint in a pipe joint which can be connected only by inserting a resin connection pipe.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided:
The substantially cylindrical joint body has a male screw portion formed at one end, a split ring is interposed between the cap nut screwed onto the male screw portion and the joint body, and a resin connection pipe is inserted through the opening of the cap nut. In a pipe joint which can be connected to the joint body by the split ring pressing the peripheral surface of the connection pipe, the joint body is provided with a cylindrical guide portion for externally fitting the connection pipe inside the male screw portion, and The portion has a groove formed on the outer peripheral surface facing the split ring, and a seal member attached to the inner peripheral surface of the connection pipe is attached to the groove.

According to a second aspect of the present invention, a plurality of the slots are formed on the outer peripheral surface of the guide portion, and a seal member is attached to each of the slots.

According to a third aspect of the present invention, the substantially cylindrical joint body has a male thread portion at one end, and a split ring is interposed between the cap nut screwed to the male thread portion and the joint body. Is inserted through the opening of the cap nut, and the split ring presses the peripheral surface of the connection pipe to enable connection to the joint body. A sealing member is attached to the sealing member, and the sealing member has an inclined surface having a large diameter in a direction protruding from the slot in a direction in which the connecting pipe is inserted.

According to a fourth aspect of the present invention, the substantially cylindrical joint body has a male thread at one end, and a split ring is interposed between the cap nut screwed onto the male thread and the joint body. Is inserted from the opening of the cap nut, and the split ring presses against the peripheral surface of the connection pipe so that the connection can be connected to the joint body. A plurality of confirmation holes through which the distal end of the tube can be viewed are provided.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIGS. 1 to 4, the pipe joint A of the present invention has a substantially cylindrical joint body 1 into which a connecting pipe 19 is inserted, and a cap nut 11 screwed to the joint body 1.
And a split ring 15 disposed between the cap nut 11 and the joint body 1.

As shown in FIGS. 1 and 2, the joint body 1 has a substantially cylindrical shape, and has a passage 2 through which hot and cold water passes in an inner axial direction, and a fastening tool such as a wrench is locked. As described above, a connecting portion 6 connected to another joint is formed on the outer periphery of one end of the tool locking portion 3 having an outer peripheral surface of, for example, a hexagonal shape, and has a slightly larger diameter than the connecting portion 6 on the outer periphery of the other end. Male thread 7
Are formed.

A cylindrical guide portion 8 having a smaller diameter than the connection pipe 19 is provided at a predetermined interval on the inner peripheral side of the male screw portion 7. The leading end of the guide portion 8 is exposed forward of the male screw portion 7, and slots 9, 9 are formed in the outer peripheral surface in an annular shape along the axial direction. 10 and 10 are respectively mounted.

The seal member 10 is for catching foreign matter adhering to the inner peripheral surface of the connection pipe 19 and preventing water leakage, and is made of an elastic material such as rubber, and is annular and protrudes from the outer peripheral surface of the guide portion 8. The connecting pipe 19 is externally fitted to the guide portion 8 as shown in FIG. Then, even if the tip of the connection pipe 19 does not form a tapered surface by chamfering, the inclined surfaces 10a, 1 of each other are formed.
0a, and the sealing members 10, 1
Numeral 0 is deformed and tightly adheres to the inner peripheral surface of the connection pipe 19 in a water-tight manner so that the seal is ensured.

The sealing member 10 is shown in FIGS.
As shown in FIG. 5, a plurality (four in each case, left and right, in this embodiment) of reinforcing portions 10b protruding from the side peripheral surface are provided. The reinforcing portion 10b is stably mounted in the slot 9 when the sealing member 10 is inserted into the slot 9, and when the connecting pipe 19 is inserted from the cap nut 11, the sealing member 10 is pushed to the tip of the connecting pipe 19 so that the slot 9 can be inserted.
When the seal member 10 is mounted in the slot 9, only the reinforcing portions 10 b on both sides elastically contact the peripheral surface of the slot 9. Since the contact area between the seal member 10 and the slot 9 is small, when the inner peripheral surface of the connection pipe 19 contacts the seal member 10, the seal member 10 is easily deformed, and the outer peripheral surface of the guide portion 8 extends from the slot 9 to the outer peripheral surface of the guide portion 8. It does not flip up.

The cap nut 11 has an internal thread 12 formed at the entrance of the inner peripheral surface thereof to be screwed to the male thread 7 of the joint body 1, and an opening 1 into which a connecting pipe 19 is inserted.
4, a tapered surface 13 having a gradually reduced diameter is formed.

The split ring 15 is inserted inside the tapered surface 13 of the cap nut 11. As shown in FIG. 4, a slit 16 is formed in a part of the axial direction to reduce the diameter and increase the diameter. The inner peripheral surface is formed with a tapered surface 17 for easily inserting the connecting pipe 19 and a concave and convex cutting groove 18 for pressing and biting the outer peripheral surface of the connecting pipe 19. Therefore, the split ring 15 can be easily inserted into the pipe joint A because the diameter of the split ring 15 increases when the connection pipe 19 is inserted.
When a force is applied to pull the connection pipe 19 out of the pipe joint A, the split ring 15 is reduced in diameter, and the bite groove 18 is inserted into the connection pipe 1.
9 penetrates deeply into the outer peripheral surface so that it cannot be pulled out.

The connection pipe 19 is made of a resin such as polyethylene.
It is inserted into a space formed between the guide portion 8 and the cap nut 11 of the joint body 1 and fits outside the guide portion 8 in a watertight manner. As shown in FIG. 3, a check hole 5 is provided at the same interval on the peripheral surface as shown in FIG. 3 so that it can be visually observed from any direction outside that the tip of the tool has been inserted until it hits the stopper 4 provided on the inner periphery of the tool locking portion 3. In this embodiment, a plurality (three in this embodiment) are bored.

In order to connect the connecting pipe 19 to the pipe joint A in the present invention, first, the cap nut 11 is inserted into the tapered surface 13 and the split ring 15 is inserted, and the male thread portion 7 of the joint main body 1 is inserted.
Screw.

Next, as shown in FIG. 1, when the distal end of the connecting pipe 19 is inserted through the opening 14 of the cap nut 11 and externally fitted to the guide section 8 of the joint body 1, the inner peripheral surface of the connecting pipe 19 becomes a sealing member. The vehicle 10 smoothly climbs over each of the inclined surfaces 10a, 10a, comes into close contact with the outer peripheral surface of the guide portion 8, and stops at a position where it comes into contact with the stopper 4 of the joint body 1 as shown in FIG. At this time, the connecting pipe 19 is connected to the guide 8 of the joint body 1 and the split ring 1.
5, the tapered surface 17 of the split ring 15 presses the outer peripheral surface of the connection pipe 19, the biting groove 18 cuts into the outer peripheral surface, and presses the connection pipe 19 against the outer peripheral surface of the guide portion 8. Therefore, the sealing of the seal member 10 is reliable, and it cannot be pulled out unless the cap nut 11 is loosened.

Also, even if foreign matter adheres to the inner peripheral surface of the connecting pipe 19, the foreign matter is captured by the seal member 10 on the distal end side mounted on the guide portion 8 of the joint body 1, and the inner seal is formed. The member 10 can reliably seal the connection pipe 19.

Further, from the confirmation hole 5 formed in the peripheral surface of the tool engaging portion 3, it can be visually checked whether the tip of the connecting pipe 19 is in contact with the stopper 4 of the joint body 1, and the stopper 4 is in contact with the stopper 4. When they are not in contact with each other, the connection pipe 19 may be inserted again to the back while visually checking the confirmation hole 5.

In such a pipe joint A, the connecting pipe 19
To pull out from the joint body 1, the split ring 15
Moves along the tapered surface 13 of the cap nut 11 toward the opening 14 so that the biting groove 18 is further deepened.
Since the sealing member 10 presses against the inner peripheral surface of the connection pipe 19, it cannot be leaked or pulled out.

When an abnormally high water pressure is applied to the water passing through the connecting pipe 19, the connecting pipe 19 expands, but the seal member 10 is deformed and firmly adheres to the inner peripheral surface of the connecting pipe 19 to leak water. Never.

[0028]

According to the pipe joint of the present invention, the substantially cylindrical joint body has a male thread at one end, and a split ring is interposed between the cap nut screwed onto the male thread and the joint body. Then, a resin-made connecting pipe is inserted from the opening of the cap nut, and the split ring presses the peripheral surface of the connecting pipe so that it can be connected to the fitting main body. A cylindrical guide portion for externally fitting the connection pipe was provided, the guide portion was formed with a groove on the outer peripheral surface facing the split ring, and a seal member was attached to the groove hole so as to be in close contact with the inner peripheral surface of the connection pipe. Therefore, compared to the conventional connection pipe in which the seal member is in close contact with the outer peripheral surface, the foreign matter adhering to the connection pipe adheres to the seal member to cause a sealing failure, or the foreign matter may enter the passage of the joint body. Supply reliable pipe fittings without intrusion It can be.

When the connecting pipe is inserted into the pipe joint, the cutting groove of the split ring cuts into the outer peripheral surface of the connecting pipe, and the seal member attached to the inner peripheral surface of the connecting pipe in a manner facing the split ring comes into water-tight contact. The connection tube cannot be easily pulled out and there is no risk of water leakage.

According to the second aspect of the present invention, a plurality of slots are formed side by side on the outer peripheral surface of the guide portion, and seal members are attached to the respective slots. The seal with the connection pipe can be reliably performed by the seal member.

According to the third aspect of the present invention, when the connection pipe made of resin is inserted from the cap nut and connected to the joint body, the connection pipe is inserted into the groove formed in the joint body and closely adheres to the peripheral surface of the connection pipe. The seal member is mounted, and the seal member is provided with an inclined surface having a large diameter in a direction in which the connection pipe is inserted in a portion protruding from the slot, so that the connection pipe has a tapered surface formed by chamfering at the tip as in the conventional case. It can be inserted smoothly into the joint body without the need, and it is not necessary to use a tool to form a tapered surface at the tip every time the connection pipe is cut according to the situation at the site, greatly improving workability .

According to the fourth aspect of the present invention, a plurality of confirmation holes are formed in the peripheral surface of the joint main body so that the distal end of the connection pipe inserted into the joint main body can be visually checked. It can be easily confirmed even from the direction, and the connection failure can be prevented, and the connection pipe can be prevented from dropping or leaking.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a state in which a connection pipe is being connected to a pipe joint.

FIG. 2 is a partial longitudinal sectional view showing a state where a connection pipe is connected to a pipe joint.

FIG. 3 is a longitudinal sectional view taken along line XX in FIG.

FIG. 4 is an exploded perspective view of a pipe joint.

FIG. 5A is a front view of a sealing member. (B) is a side view of the sealing member.

FIG. 6 is a partial longitudinal sectional view showing a state in which a connecting pipe is being connected to a conventional pipe joint.

FIG. 7 is a partial longitudinal sectional view showing a state where a connection pipe is connected to a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 5 Confirmation hole 7 Male thread part 8 Guide part 9 Slot 10 Seal member 10a Inclined surface 11 Cap nut 14 Opening part 15 Split ring 19 Connection pipe A Pipe joint

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takuchi Tachiuchi 1-27-10 Hoshidakita, Katano-shi, Osaka F-term in JOP LUX Co., Ltd. 3H015 DA06 DA09

Claims (4)

[Claims] 1. A substantially cylindrical joint body has a male thread at one end, a split ring interposed between a cap nut screwed onto the male thread and the joint body, and a resin connection pipe is connected to the cap nut. In a pipe joint which can be connected to the joint main body by being inserted from the opening and the split ring pressing the peripheral surface of the connection pipe, the joint main body has a cylindrical guide portion for externally fitting the connection pipe inside the male screw portion. Wherein the guide portion has a groove formed on the outer peripheral surface facing the split ring, and a seal member is attached to the groove so as to be in close contact with the inner peripheral surface of the connection pipe. 2. The pipe joint according to claim 1, wherein a plurality of the slots are formed on the outer peripheral surface of the guide portion in parallel, and a seal member is attached to each of the slots. 3. A substantially cylindrical joint body has a male thread at one end thereof, a split ring interposed between a cap nut screwed onto the male thread and the joint body, and a resin connection pipe is connected to the cap nut. In a pipe joint which can be connected to the joint main body by being inserted from the opening and the split ring pressing the peripheral surface of the connecting pipe, a seal member which is in close contact with the peripheral surface of the connecting pipe in a slot formed in the joint main body. A pipe joint, wherein the seal member has an inclined surface having a large diameter in a direction in which the connection pipe is inserted in a portion protruding from the slot. 4. A substantially cylindrical joint body has a male thread at one end, a split ring is interposed between a cap nut screwed to the male thread and the joint body, and a resin connection pipe is connected to the cap nut. In a pipe joint that can be connected to the joint main body by inserting from the opening and the split ring presses the peripheral surface of the connection pipe, the peripheral surface of the joint main body has a tip of the connection pipe inserted into the joint main body. A pipe joint characterized by a plurality of visible confirmation holes.