JP4862071B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint in which a connection pipe for piping such as a resin pipe is inserted and connected, and particularly relates to a pipe joint that prevents the connection pipe from being insufficiently inserted and facilitates confirmation of insertion.

Pipe joints for connecting and connecting connecting pipes such as resin pipes are widely used for pipe connections for water supply and hot water supply.
In this case, when the connecting pipe is inserted into the pipe joint, if it is not sufficiently inserted into the pipe joint, a water leakage trouble may occur after the connecting pipe.
In particular, for pipe fittings of the type in which the tip of the connection pipe is inserted between the outer cylinder part concentrically provided outside the inner cylinder part while guiding the connection pipe to the inner cylinder part. Since the tip of the tube is inserted inside the outer cylinder part, it is blocked by the outer cylinder part, and it is difficult to visually confirm the insertion.

  Therefore, for example, Patent Literature 1 discloses a technique in which a connection pipe insertion confirmation hole is provided from the base of the outer cylinder portion, and Patent Literature 2 forms a water leakage generating portion in an insertion guide of the connection pipe, and Disclosed is a technique for confirming the normal connection of the pipe by making it leak in the water flow test if it is not normally connected to the pipe joint.

However, in the connection pipe insertion confirmation hole as shown in Patent Document 1, the back part of the confirmation hole is dark, and it is often difficult to confirm the tip of the connection pipe.
Moreover, in the technique shown in Patent Document 2, a water leakage portion is provided in the insertion guide, and it cannot always be said that accurate connection confirmation will be obtained depending on some insufficient insertion or tightening.

Japanese Patent Laid-Open No. 2-163592 JP 2005-90531 A

  In the pipe joint in which the distal end portion of the connection pipe is inserted and inserted into the pipe joint and tightened and connected with the cap nut, the threaded depth of the cap nut is optimized, so that the pipe connection work is efficient and normal. The purpose is to provide a pipe joint that facilitates connection confirmation.

  The pipe joint includes a joint body having a connection pipe insertion recess between the inner cylinder part and the outer cylinder part formed concentrically on the outer side thereof, and a cap nut, and has an insertion port for the connection pipe provided in the cap nut. A pipe joint for connecting the connection pipe by inserting the tip of the connection pipe between the inner cylinder part and the outer cylinder part and screwing and tightening the cap nut to the outer cylinder part. Positioning lock means for positioning the initial screwing position and positioning lock release means for allowing the cap nut to rotate when the tip of the connection pipe is inserted to the bottom of the connection pipe insertion recess.

  In the initial state in which the cap nut is screwed onto the joint body, the rotation of the cap nut is not required when inserting the connecting pipe into the pipe joint because the positioning lock means restricts the cap nut from turning. This makes connection work more efficient.

  After the cap nut is made rotatable by the positioning lock releasing means, and when the cap nut is tightened by a predetermined amount, the cap nut is tightened by a predetermined amount by having a rotation lock means for restricting the rotation of the cap nut. Normal piping connection can be made by just plugging in.

Here, the positioning lock means is an outer cylinder portion of the joint main body, and is positioned in the vicinity of the bottom portion of the connecting pipe insertion recess, moves inward and outward along the positioning hole, and is approximately equal to the thickness of the positioning hole. A matching positioning member and a lock member that presses and biases the positioning member from the outside may be included, and the lock member may be accommodated in a lock member accommodation hole that penetrates the side portion of the cap nut.
Further, the rotation lock means has a lock hole penetrating the outer cylinder portion of the joint body, and when the cap nut is tightened by a predetermined amount from the initial state through the rotatable state, the lock nut is inserted into the storage hole of the cap nut. The stored lock member may partially project into the lock hole.
Here, the expression that the lock member partially protrudes into the lock hole is that the lock member extends from the lock member housing hole provided in the cap nut to the lock hole provided in the outer cylinder portion of the joint body. This prevents the cap nut from rotating due to interference between the lock member and the lock hole.

The pipe joint can also allow a double check of whether or not the connection is normal in a water flow test. In that case, the flange part of the joint body is an end face recess that opens toward the cap nut side. And a tightening confirmation water leakage hole penetrating outward from the water passage hole through the end surface recess, and a tightening confirmation seal member is provided in the end surface recess so as to be pressed against the end of the cap nut. When the cap nut is not sufficiently tightened, liquid leakage may occur outside the tightening confirmation leakage hole due to insufficient pressing of the tightening confirmation seal member.
As a means for causing liquid leakage due to insufficient tightening of the cap nut, in addition to the above, a joint body having a connecting pipe insertion recess between the inner cylinder part and the outer cylinder part formed concentrically on the outside thereof, A cap nut, and the end of the connecting pipe is inserted between the inner tube portion and the outer tube portion via the connecting tube insertion port provided in the cap nut, and the cap nut is screwed onto the outer tube portion. It is a pipe joint that connects the connection pipes by tightening, and the insertion port of the connection pipe of the cap nut forms an enlarged diameter part in which the inner diameter shape partially expands outward with respect to the perfect circle. If the tip is inserted and the cap nut is not sufficiently tightened, liquid leakage may be generated from the seal portion corresponding to the enlarged diameter portion.
Here, the insertion port shape of the connecting pipe of the cap nut has an enlarged diameter part that is partially expanded outward with respect to the perfect circle. The tip of the resin connecting pipe is inserted into the joint. In this case, the connecting pipe is inserted while learning the shape of the inner diameter of the cap nut.
At this time, if the cap nut is not sufficiently tightened, even if the connection pipe is inserted into the connection pipe insertion recess provided between the inner cylinder part and the outer cylinder part formed concentrically on the outer side, The seal portion provided between the tube portion and the connecting pipe is not pressed uniformly, and liquid leakage occurs from the portion inserted along the diameter-enlarged portion of the insertion opening of the cap nut.

  The pipe joint is regulated so that the cap nut will not turn from the initial state unless the tip of the connection pipe is properly inserted and inserted to the bottom of the connection pipe insertion recess of the pipe joint. Can be prevented.

In addition, if the cap nut is tightened by a predetermined amount after the connecting pipe is normally inserted into the pipe joint and inserted, the nut is controlled so that it will not turn any further, so that it can be easily connected with an appropriate tightening allowance.
Furthermore, if a tightening confirmation leak hole is provided penetrating outward from the water passage hole, and a tightening confirmation seal member that shuts off the tightening confirmation leak hole by tightening the cap nut is attached, In the test, it is possible to easily find a tightening failure of the cap nut.
In the present invention, since the connection pipe insertion port of the cap nut is not a perfect circle, when the cap nut is not sufficiently tightened, the seal portion corresponding to the enlarged diameter portion has a pressing force compared to other portions. However, when the cap nut is properly tightened, the seal portion is also pressed against the enlarged diameter portion and is sufficiently sealed.
Thereby, insufficient tightening of the cap nut can be prevented beforehand by a water passing test.

The procedure for connecting the connecting pipe to the pipe joint is shown. (A) shows the pipe joint of an initial state, (b) shows the state which inserted and inserted the front-end | tip part of the connection pipe into the pipe joint, and the cap nut became rotatable. (C) shows a state where the cap nut is tightened by a predetermined amount and the connecting pipe is normally connected. Sectional drawing of the lock hole vicinity of a pipe joint is shown. (A) is a sectional view taken along line AA, (b) is a sectional view taken along line BB, and (c) is a sectional view taken along line CC. The example of a component structure of a pipe joint is shown. An example in which a tightening confirmation water leakage hole due to water leakage is provided in the joint body is shown. The example which provided the enlarged diameter part partially in the insertion port of a cap nut is shown. When the cap nut is tightened, an explanatory diagram in which the connecting pipe is tightened to a perfect circle by the split ring is shown. The example which combined the lock mechanism of a cap nut and the partial diameter expansion opening structure of a cap nut is shown.

A component configuration example of the pipe joint 10 will be described with reference to FIG.
The pipe joint 10 includes a joint body 20 having a water passage hole 27 therethrough and a cap nut 30 that is screwed into the joint body 20.
The cap nut 30 also has an insertion port 32 through which the connection pipe is inserted.
One of the pipe joints 20 has a male threaded portion 26 and the other has an inner cylindrical portion 23 and an outer cylindrical portion 22 at a predetermined interval on the outer side, but at least one of the inner cylindrical portion and the outer cylindrical portion is shown. Any pipe joint having an insertion portion of the connecting pipe 1 made of the above can be applied to various joints.

The joint body 20 has an inner cylinder part 23 protruding from a flange-like nut part 21 and an outer cylinder part 22 concentrically on the outer side thereof, and a space between the inner cylinder part 23 and the outer cylinder part 22 is the connection pipe 1. A connecting pipe insertion recess 28 for inserting the end portion is formed.
A groove portion 23 a is provided on the outer peripheral portion of the inner cylinder portion 23, and a seal member 60 such as an O-ring is attached to the groove portion 23 a and sealed on the inner peripheral surface of the connection pipe 1.
The outer cylinder part 22 has a male screw part 22a from the tip part, a positioning hole 24 penetrating to the nut part 21 side of the male screw part 22a and in the vicinity of the bottom part 28a of the connecting pipe insertion concave part 28, and the positioning hole 24 Has lock holes 25 penetrating at different outer peripheral positions.
A positioning member 52 is attached to the positioning hole 24 of the outer cylinder portion 22 so as to be movable inward and outward.
The positioning member 52 has an inclined surface 52 a that protrudes inward toward the back side at a portion located inside the positioning hole 24, and the end of the connecting pipe 1 is in sliding contact with the inclined surface 52 a.
The thickness T ₁ of the positioning member 52 is generally matched with the thickness T ₀ of the positioning hole 24, and T ₁ may be slightly larger than T ₀ .

The cap nut 30 has an internal thread portion 36 on the inner side and an inclined surface 35 that comes into contact with a split ring 40 disposed on the inner side so as to be slidable.
The split ring 40 has a slit-shaped notch portion 41 in the axial direction and an inclined surface 42 on the tip side, and in this embodiment, a groove-shaped relief recess 43 is provided on the outer peripheral portion.
The slanted surface 35 of the cap nut 30 and the slanted surface 42 of the split ring 40 are both slanted surfaces in the direction in which the tip side protrudes inward, and the cap nut 30 is screwed into the male threaded portion 22a of the joint body 20 and tightened. And the inclined surfaces 35 and 42 are in sliding contact, the split ring 40 is reduced in diameter, and the connecting pipe 1 is tightened from the outside.
In addition, as long as the connection pipe 1 can be connected to the joint by tightening the cap nut, the structure is not limited to this split ring structure, and various structures such as a configuration in which a pressing tooth is provided inside the cap nut are adopted. .
The cap nut 30 has a nut portion 31 on the outer periphery and a lock member accommodation hole 34 on the side of the joint main body 20 from the nut portion 31, and a lock member 51 is accommodated therein so as to be movable inward and outward.
The thickness T ₃ of the lock member 51 is thicker than the thickness T ₄ of the lock member accommodation hole 34.
A ring-shaped pressing member 50 made of an elastic material that presses and biases the locking member 51 inward is attached to the outer peripheral side of the locking member 51.

Next, the connection procedure of the connection pipe 1 will be described.
As shown in FIGS. 1A and 2A, in the initial state, the positioning member 52 is pressed inward by the lock member 51 pressed inward by the pressing member 50, and the tip of the positioning member 52 is connected to the connecting tube. Since the thickness T ₄ of the lock member 51 is thicker than the thickness of the lock member accommodation hole 34, the lock member 51 partially enters the positioning hole 24 and the rotation of the cap nut 30 is restricted. Has been.
In this state, as shown in FIG. 1B and FIG. 2B, when the connecting pipe 1 is inserted and inserted in the direction of S1, the positioning member 52 is moved in the direction shown in S2 by the tip of the connecting pipe 1. Extruded outside.
Then, since the thickness T ₁ of the positioning member 52 is not thinner than the thickness T ₀ of the positioning hole 24, the inner end of the lock member 51 does not interfere with the positioning hole 24 and the cap nut 30 can be rotated.
Therefore, if the connecting pipe 1 is not normally inserted up to the bottom 28a of the connecting pipe insertion recess 28, the cap nut 30 does not rotate, so that the connecting pipe 1 can be easily confirmed.

Next, as shown in FIGS. 1C and 2C, when the cap nut 30 is tightened in the direction of S <b> 3, the lock member 51 moves along the outer periphery of the outer cylindrical portion 22, and the lock hole 25. When the position coincides, the pressing member 50 partially pushes into the inner lock hole 25 as shown in S4.
Thereby, the front-end | tip part of the lock member 51 interferes with the lock hole 25, and it controls so that the cap nut 30 may not rotate any more.
By appropriately setting the tightening amount of the cap nut 30 in advance, the amount of diameter reduction of the split ring 40 can be controlled, and the connection is easily completed.

FIG. 4 shows an example in which a connection confirmation leak hole is provided in the joint body by a water flow test. An annular end surface recess 29 is provided on the end surface on the side of the cap nut of the flange-shaped nut portion 21 of the joint body 20.
The end surface recess 29 is a recess-shaped groove opened toward the end surface on the screwing tip side of the cap nut 30, and a ring-shaped tightening confirmation seal member 61 is attached to the groove.
In the present embodiment, the sealing member 61 having a cross section having a substantially triangular shape is shown, but a normal O-ring may be used. When the cap nut 30 is tightened, the tightening confirmation is performed at the end 37 of the cap nut 30. The seal member 61 is pressed.
The joint main body 20 is provided with a tightening confirmation water leakage hole 29a penetrating from the water passage hole 27 through the end surface recess 29 to the outside.
When the cap nut 30 is tightened, the end portion 37 of the cap nut 30 presses the tightening confirmation seal member 61 from the side, and when the tightening confirmation seal member 61 is pressed, the tightening confirmation water leakage hole 29a is blocked. No water leaks from the water passage hole 27 to the outside.
Therefore, conversely, when water leaks outside from the tightening confirmation leakage hole 29a in the water flow test, it is possible to discover in advance that the cap nut 30 has been forgotten to be tightened or insufficiently tightened.
In the present embodiment, a ring-shaped tightening confirmation seal member 61 is disposed in the annular end surface concave portion 29, and a structure in which water leaks to the outside from the tightening confirmation water leakage hole 29a due to insufficient press is shown. The shape of the sealing member, the groove, and the water leakage confirmation hole is not limited to this as long as water is leaked to the outside due to insufficient tightening.

FIG. 5 shows a state where the cap nut 30 </ b> A is temporarily assembled to the joint body 20.
The inner shape 32Aa of the connecting pipe insertion port 32a of the cap nut 30A is not a perfect circle made of a concentric circle with the inner cylinder portion 23. In FIG. In this example, the diameter-expanded portion 32Ab that is slightly enlarged in diameter is formed.
It is sufficient that the diameter-expanded portion is about 0.2 to 0.5 mm, and it is sufficient that the diameter is slightly expanded outward with respect to the perfect circle. However, in the drawing, the deviation is greatly expressed for easy understanding. .
When the inner shape 32Aa of the insertion opening of the cap nut 30A is formed as described above, the following operation occurs.
Because the insertion opening of the cap nut 30A as shown in FIG. 6 (a) is not a perfect circle, for example, who d ₂ is the gap between the upper d ₂ and the clearance of the lower d ₁ in the example shown in FIGS. 6 (a) A little bigger.
On the other hand, the internal thread portion 36 other than the inner shape 32Aa of the insertion opening of the cap nut 30A and the inclined surface 35 have a perfect circle shape.
Further, the split ring 40 has an inner diameter that is substantially a perfect circle, and the gap between the split ring 40 and the seal portion 60 is substantially the same over the entire circumference.
Before tightening the cap nut 30A, as shown in FIG. 6 (b), the connecting pipe 1 is inserted in a deformed state because the connecting tube 1 is inserted following the partially enlarged diameter portion 32Ab of the cap nut insertion port. .
As a result, very slight gap seal portion corresponding to the enlarged diameter portion 32Ab as shown in FIG. 6 (b) or is d ₃ portion of the pressing shortage occurs.
Actually, it is sufficient that the pressing of this portion is insufficient, and the gap is not necessary. However, for the sake of easy understanding, the gap is expressed in FIG. 6B.
Next, as shown in FIG. 6C, when the cap nut is tightened to a normal state, the split ring 40 tightens the outer peripheral portion of the connecting pipe 1 to a perfect circle, so that liquid leakage does not occur, but the cap nut is not tightened. to be sufficient when the water flow test from a portion of the d ₃ leakage occurs.
Thereby, insufficient tightening of the cap nut can be found.
The cap nut 30A structure shown in FIGS. 5 and 6 may be used alone for the joint, or may be used in combination with a cap nut locking mechanism as shown in FIG.
Since the lock mechanism of the cap nut has been described above, detailed description thereof will be omitted.

DESCRIPTION OF SYMBOLS 1 Connection pipe 10 Pipe joint 20 Joint main body 21 Nut part 22 Outer cylinder part 22a Male thread part 23 Inner cylinder part 24 Positioning hole 25 Lock hole 28 Connection pipe insertion recessed part 30 Cap nut 31 Nut part 32 Insertion port 34 Lock member accommodation hole 40% Ring 41 Notch 50 Press member 51 Lock member 52 Positioning member 60 Seal member

Claims (1)

A joint body having a connecting pipe insertion recess between the inner cylinder part and the outer cylinder part formed concentrically on the outside thereof, and a cap nut;
By inserting the tip of the resin connection pipe between the inner cylinder part and the outer cylinder part via the connection pipe insertion port provided in the cap nut, and screwing and tightening the cap nut to the outer cylinder part A pipe joint for connecting a connecting pipe,
The outer peripheral part of the inner cylinder part has a ring-shaped seal member that contacts and seals the inner peripheral surface of the connecting pipe,
The cap nut has a connection pipe insertion port formed with a diameter-enlarged portion partially expanded outward with respect to a perfect circle whose inner diameter shape is concentric with the outer periphery of the inner cylinder portion, and from the insertion port toward the back side. and sliding enlarged cone-shaped inner circumferential surface along the inclined surface and the inclined surface consisting of a true circle, and a split ring of a true circle positioned on the outer peripheral portion of the connecting tube,
When the cap nut is not sufficiently tightened , the split ring is not sufficiently tightened, and the outer peripheral portion of the connecting pipe is inserted in a deformed state following the partially enlarged diameter portion of the insertion port. When the sealing pressure at the enlarged diameter portion becomes insufficient and liquid leakage occurs from the enlarged diameter portion, and the cap nut is tightened to a normal state, the split ring is reduced in diameter along the inclined surface, and the outer peripheral portion of the connecting pipe is straightened. A pipe joint characterized in that it is pressed over the entire circumference of the connection pipe and the sealing member by tightening to a circle so that liquid leakage does not occur.

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