JP3122350B2 - Plumbing fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connector, and more particularly to a connector for rotatably connecting a pipe to be connected to a connection subject.

[0002]

2. Description of the Related Art As shown in FIG. 1, for example, a pipe connecting device of this type includes a connecting body (20) for hot water supply projecting from a lower surface of a casing (10) of a wall-mounted water heater and a swingable swinging member. It is used for the connection part with the connected pipe (30) connected to. The connected pipe (30) is generally configured such that a bendable bellows pipe is provided in a certain range from the tip, and a shower and a normal water switching type water supply head (40) are attached to the tip. .

In order to make the connected pipe (30) swing freely, in a conventional apparatus, as shown in FIG. 2, a convex rib (31) is provided at a position away from the upper end of the connected pipe (30) by a certain distance. An enlarged opening (23) for rotatably receiving the upper region from the convex rib (31) is formed over a certain range from the lower end of the connection main body (20). And the connection subject (20)
A cap nut (21) is screwed onto the outer periphery of the lower end of the cap nut (21), and a washer (22) is provided between the collar (T) projecting inward from the lower end of the cap nut (21) and the lower end of the connection body (20). ) Is interposed. The washer (22) is connected to the pipe (3) below the convex rib (31).
0), the connected pipe (30) is connected to the connection main body (20) in a retaining state, and the connection main body (2)
0) is connected so as to be relatively rotatable. In addition, convex rib (3
Since an O-ring (32) is interposed between the upper portion of (1) and the inner peripheral surface of the enlarged opening (23), the convex rib (31) and the connecting body (2)
The O-ring (32) ensures the watertightness of the connection with the O-ring.

[0004]

However, in this conventional apparatus, when the connected pipe (30) is repeatedly swung and swung,
In some cases, the threaded portion between the cap nut (21) and the connection body (20) is loosened, resulting in poor watertightness at the connection between the connection body (20) and the cap nut (21), or the cap nut (21). ) Is inconvenient.

[0005] Since the washer (22) and the cap nut (21) are relatively rotatably in contact with each other, the connected pipe (30) in contact with the washer (22).
This is because a turning force acts on the cap nut (21) due to the rotation of the nut, and when the frictional force of the screwing portion with the connection main body (20) is insufficient, the screwing is released. Then, repeatedly connect the pipes (3
If (0) is swung, the above situation will eventually occur even if the screwing release dimension is small. As shown in FIG. 2, from the inner periphery of the washer (22),
In the case of the protrusion (24), the frictional force between the protrusion (24) and the connected pipe (30) also acts to loosen the cap nut (21), so that it is easier to loosen.

The inventions of claims 1 to 4 have been made in view of the above point, and prevent the cap nut (21) from being loosened even if the connected pipe (30) is repeatedly swung. That is the subject.

[0007]

Means for Solving the Problems The means for solving the problem of the present invention according to claim 1 taken to solve the above-mentioned problem is as follows: "A cylindrical connecting body (20) and a lower end of the connecting body (20) Cap nut (21)
Between the connected pipe (30), the upper end of which is in a retaining state and is relatively rotatably attached, between the lower end of the connection main body (20) and the collar (T) of the lower end of the cap nut (21). In a pipe connector having an intervening washer (22), the connection body (2
0), the washer (22) is configured to engage with the relative rotation preventing state, and is formed on the outer periphery near the upper end of the connected pipe (30) and is engaged with the washer (22) from above. The outside diameter of the portion (31) is set smaller than the diameter of the through hole (210) surrounded by the collar portion (T), and the side wall of the washer (22) has a slit (S) extending over the entire axial direction. ) Has been cut down].

Here, the structure in which the washer (22) engages with the connection main body (20) in a state of preventing relative rotation is described in, for example, "The connection main body (20) and the washer". (twenty two)
And the engaging concave portion provided on one side
(25), the connection main body (20) and the washer (22) engage with each other in a state of preventing relative rotation ”.

According to the first and second aspects of the present invention, the following effects can be obtained. The turning force when the connected pipe (30) is rotated is a washer (22) rotatably fitted to the connected pipe (30).
Act on. However, since the washer (22) is engaged with the connection main body (20) in a state of preventing relative rotation, the turning power is received by an engagement portion between the washer (22) and the connection main body (20). It is not transmitted to the cap nut (21). According to the above technical means, the diameter of the through-hole (210) surrounded by the collar (T) formed at the lower end of the cap nut (21) is determined by the diameter of the connected pipe (3).
0) is set to be larger than the outer diameter of the convex rib (31) formed on the outer periphery near the upper end. Therefore, even if a water supply head or the like is provided on the distal end side of the connected pipe (30), the cap nut is provided.
(21) can be extrapolated from the side of the convex rib (31). Then, in order to prevent the cap nut (21) from being detached even when the cap nut (21) is externally mounted from the side of the convex rib (31), the washer (22) is enlarged at the slit (S), and this is connected to the connected pipe. The external fitting is forcibly attached to the lower side of the convex rib (31) in (30) from the side.

According to the third aspect of the invention, the cap nut (21) is prevented from loosening by directly connecting the cap nut (21) to the connection main body (20). A connection main body (20), a connected pipe (30) which is attached to a lower end of the connection main body (20) by a cap nut (21) in a state in which an upper end is retained and is relatively rotatable; and Subject
(20) and a washer (22) interposed between the lower end (T) of the cap nut (21) and a washer (22). In a state where the cap nut (21) is tightened, the cap nut (21) is loosely engaged with the connection main body (20) in a one-way engagement in a rotation preventing state, and an upper end of the connected pipe (30). The outer diameter of the convex rib (31) formed on the outer periphery in the vicinity and engaging the washer (22) from above is set smaller than the diameter of the through-hole (210) surrounded by the collar (T). Further, the side wall of the washer (22) is provided with a slit (S) extending in the entire axial direction ”.

Here, the one-way engagement is defined as a cap nut (2
1) does not engage in the direction of tightening, but refers to the relationship of engaging in the opposite direction, as a one-way engagement in the loose rotation prevention state with respect to the connection main body (20), for example, According to the invention as set forth in claim 4, "the locking portion provided on the cap nut (21) and the rotation preventing piece (2
8) is one-way engaged in the state in which the cap nut (21) is prevented from loosening and rotating ".

According to the third and fourth aspects of the present invention, the following effects can be obtained. In the tightened state of the cap nut (21), since the cap nut (21) is loosely engaged with the connection main body (20) and one-way engaged in the rotation preventing state, the connected pipe (30) is reciprocated. Even so, the cap nut (21) does not come loose. The invention of claim 5 is the invention according to claim 4, wherein the cap nut (21) or the connecting body (20) is made of an elastic material, and the cap nut (21) is tightened. (21) or a part or all of the connection main body (20) is elastically deformed so that the locking portion and the rotation preventing piece (28) are one-way engaged in the loose rotation preventing state of the cap nut (21). In the case where this means is adopted, the cap nut (21) is tightened and the locking portion and the rotation preventing piece (2
8) and the tightening operation torque of the cap nut (21) when the one-way engagement is performed in the rotation preventing state is reduced. Even if the degree of one-way engagement is large, there is no fear that the operating torque becomes excessive.

According to a sixth aspect of the present invention, in the fourth or fifth aspect, an annular wall portion is connected to the open end of the cap nut (21) following the female screw portion, And the annular wall surrounds the lower end of the rotation preventing piece (28) when the cap nut (21) is tightened. " In this device, when the cap nut (21) is tightened by hand, the finger or the like does not come into contact with the locking member of the cap nut (21), and the rotation preventing piece ( It is difficult to contact the lower end of (28).
In addition, the said annular wall part includes what has a partial thread part following the said internal thread part.

According to the invention of claim 7, "the cap nut (21)
A similar effect is produced when a flange is protruded at the open end of the above. The finger holding the cap nut (21) is the cap nut.
This is because it is pushed outward on the open end side of (21).

[0015]

As described above, according to the first and second aspects of the present invention, the turning power of the connected pipe (30) is received by the joint between the washer (22) and the connection main body (20). Rotating power is cap nut
Since it is not transmitted to (21), there is no disadvantage that the cap nut (21) is loosened even if the connected pipe (30) is repeatedly rotated.

Further, since the connecting body (20) and the washer (22) are brought into a rotation preventing state by devising a manner of connection, no special parts for preventing the rotation are required. Further, as described above, even when a water supply head or the like is provided on the distal end side of the connected pipe (30), the cap nut (21) can be externally attached from the convex rib (31) side. , Workability is improved. According to the third and fourth aspects of the present invention, the cap nut (21) and the connecting body (20) are connected to each other to rotate the cap nut (21) in the loosening direction accompanying the turning of the connected pipe (30). Is prevented, the cap nut (21) does not become loose with the rotation of the connected pipe (30).

In addition, since the connection main body (20) and the cap nut (21) are devised in a manner of preventing the rotation by devising the manner of connection, no special component for preventing the rotation is required.
According to the invention of claim 5, since the tightening operation torque of the cap nut (21) until the one-way engagement is performed (at the time of one-way engagement) is reduced, even if the degree of engagement of the one-way engagement is large. There is no fear that the operation torque becomes excessive,
The locking effect is further ensured.

According to the sixth and seventh aspects of the present invention, even when the cap nut (21) is grasped by hand and tightened,
Safety during the tightening operation is ensured.

[0019]

Next, embodiments of the present invention will be described in detail with reference to the drawings. The embodiment shown in FIGS. 3 to 5 is an embodiment in which the present invention is embodied in a portion of a connection main body (20) as a hot water supply outlet of the water heater shown in FIG. 1, and FIGS. FIG. 5 shows an embodiment according to the second aspect of the present invention, and FIG. 5 shows an embodiment according to the third and fourth aspects of the present invention.

A cylindrical connecting body (20) protrudes downward from the center of the lower surface of the water heater casing (10), and a cap nut (21) as shown in FIG. A fitting is employed. A cylindrical portion (24) protrudes downward from the lower surface of the washer (22) housed in the cap nut (21) in a state of being fitted to the connected pipe (30), and the cylindrical portion (24) The thickness is set to be inserted into the through-hole (210) surrounded by the collar (T) located at the lower end of the nut (21). As shown in FIGS. 4 and 5, near the outer periphery of the upper surface of the washer (22), an engagement recess (25) formed in an inverted triangular shape is cut out, and a cap nut (21) is formed.
The steep side (251) that engages with the steep side (261) of the engaging projection (26) described later when the is turned in the loosening direction has a larger gradient than the other gentle side (250). .

The reason why the engagement recess (25) is formed only near the outer periphery of the washer (22) is that the vicinity of the inner periphery of the upper surface (A) of the washer (22) is made smooth and smooth. This is for ensuring smooth relative rotation of the convex rib (31) of (30). The angle formed by the upper surface (A) and the gentle inclined side (250) and the steeply inclined side (251) is set to an acute angle. The washer (22) is rotatably mounted below a convex rib (31) provided in the vicinity of the upper end of the connected pipe (30), similarly to the above-described conventional one.

On the other hand, on the lower end surface of the connection main body (20), an engagement projection (2) having a shape that is fitted and engaged with the engagement recess (25).
6) is protruding. Therefore, in this embodiment, the connection subject (20) and the washer (22) are engaged with each other in a state of preventing relative rotation. The angle of inclination of the steeply inclined sides (251) and (261) of the engaging projections (26) and the engaging recesses (25) with respect to the lower end surface of the connection main body (20) is acute. Steep side (251)
Since the inclination angle of (261) is larger than that of the gently inclined sides (250) and (260), the cap nut (21) is loosened against the washer (22) and the force in the turning direction is applied to the washer (22) as described later. When acted upon,
The degree of engagement between the engaging concave portion (25) and the engaging convex portion (26) (cap nut
There is an advantage that the cap nut (21) is unlikely to be loosened even if the degree of overlap in the axial direction of (21) is small.

A through hole formed at the lower end of the cap nut (21)
The diameter of (210) is set to be larger than the diameter of the convex rib (31) formed near the upper end of the connected pipe (30). Therefore, even if a bellows portion and a water supply head (not shown) are provided on the distal end side of the connected pipe (30) and they are larger than the through hole (210), the cap nut (21) can be connected to the convex rib (31). ) It is possible to extrapolate from the side. And said cap nut (21)
A washer (22) is provided so that it does not come off even if it is extrapolated from the side of the convex rib (31).
An axial slit (S) is cut into the side wall of (4) to form a vertically split shape (partially open). This allows the washer
(22) can be enlarged at the slit (S), and can be forcibly fitted to the lower part of the convex rib (31) of the connected pipe (30) from the side thereof. . According to this,
Even if the diameter of the through-hole (210) is larger than the diameter of the convex rib (31), the convex rib (31) is engaged with the washer (22) in a retaining state, so that the connected pipe (30) is It is securely connected to the connection subject (20).

In this embodiment, when the cap nut (21) is screwed into the lower end of the connecting body (20) in the state shown in FIG.
Inside the through hole (210) at the lower end of (21), the cylindrical portion (24) on the lower surface of the washer (22)
Is in an inserted state, and furthermore, an engaging concave portion (25) formed on the upper surface of the washer (22) and an engaging convex portion (26) protruding from the lower surface of the connection main body (20) are in the engaged state. Become. Further, similarly to the above-mentioned conventional one, the watertightness between the connection main body (20) and the connected pipe (30) is ensured by the O-ring (32), and further, near the upper end of the connected pipe (30). The circumferentially provided convex rib (31) is engaged with the washer (22) so that both are prevented from coming off and are rotatably connected, whereby the pipe connector of the present embodiment is assembled. Become.
In this assembled state, the connected pipe (30) is provided with a washer on the lower surface of the convex rib (31), similarly to the conventional one shown in FIG.
(22), the connected pipe (30) is a cap nut (21)
There is no direct contact with.

In this embodiment, in the above assembled state, the washer (22) contacts the lower end of the connection body (20),
(20) Engagement protrusion (26) at lower end and washer (22) Engagement recess (25) on upper surface
Are fitted and engaged, and the washer (22) meshes with the connection main body (20) in a state of preventing relative rotation. Therefore, the rotating power when the connected pipe (30) is rotated is received by the engaging portion between the engaging concave portion (25) and the engaging convex portion (26), and the cylindrical portion (24) and the washer (22) are received. ), And is not transmitted to the cap nut (21) side. Therefore, even if the connected pipe (30) is repeatedly rotated, the cap nut (21) is not loosened, and there is a disadvantage that water leaks from the connection portion between the connected pipe (30) and the connection main body (20). Can be prevented.

FIGS. 3 and 4 show an embodiment in which an engagement projection (26) is provided on the lower surface of the connection main body (20), and an engagement recess (25) into which the engagement projection (26) is fitted is provided with a washer (22). An engaging concave portion (25) is formed on the lower end surface of the connection main body (20), and an engaging convex portion (26) that fits into and engages with the engaging concave portion (25) protrudes from the upper surface of the washer (22). You may. Further, a plurality of the engaging concave portions (25) and the engaging convex portions (26) may be provided at a constant pitch on the lower surface of the connection main body (20) and the upper surface of the washer (22). (25) or engaging projection
Only one of (26) may be provided at a constant pitch.

Further, in the above embodiment, the cap nut (21)
The diameter of the through hole (210) at the lower end of the pipe is larger than the diameter of the convex rib (31) of the connected pipe (30), but the cap nut (21) is removed from the lower end of the connected pipe (30). In the case of a condition that can be inserted, the through hole (210) may be smaller than the diameter of the convex rib (31) portion, and the side wall of the washer (22) and the cylindrical portion (24) may be formed in the axial direction. There is no need to cut the slit.

In the above-described embodiment, the engaging concave portions (25) and the engaging convex portions (26) are provided with the gentle inclined sides (250) and (260) having different inclination angles.
And steep sides (251) and (261).
The shape of each of these inclined sides may be an isosceles triangle having the same inclination angle. In addition, the engaging concave portion (25) and the engaging convex portion (26) can be simply irregularities or other various shapes as long as they can engage with each other.

The gently inclined sides (250) (26) as in the above embodiment
(0) and steeply sloping sides (251) and (261), when the engaging concave portion (25) and the engaging convex portion (26) are combined, the connection main body (20) and the washer (22) are engaged. It has the advantage of easy status. Bag nut
When the (21) is tightened, the washer (22) tends to rotate together at this time, and the engaging recess (25) and the engaging protrusion (26) are fitted into each other due to the co-rotation. is there.

FIGS. 5 to 8 show an embodiment corresponding to the third to seventh aspects of the present invention. In this device, a cap nut (21) is loosely engaged with a connection main body (20) in a rotation preventing state. In the case of FIG. 5, the upper end surface of the cap nut (21) has a triangular anti-rotation locking portion (2).
7) (27) are protruded at predetermined intervals, and a rectangular rotation preventing piece (28) protrudes from the outer periphery of the trunk of the connection main body (20). Then, the bottom side and the hypotenuse (2
Each of the angles formed by the pivots 70 and 271 is set to be an acute angle, and when the cap nut 21 is loosely rotated, the steeply inclined side 271 having a large inclination angle is formed by the rotation preventing piece 28. ). Other configurations are the same as those in FIG. That is, the cap nut (2
1) is screwed together with the washer (22), and the cap nut (21) which is fitted to the connected pipe (30) in a rotatable manner in a detachable state with respect to the connected pipe (30).
The flange (T) and the lower end surface of the connection body (20) are configured to be pressed.

In this case, the cap nut (21) is connected to the connecting body (2
When the screw is engaged with the lower end of (0), the lower end of the rotation preventing piece (28) comes into contact with the gentle inclined side (270) of the rotation preventing projection (27). When the cap nut (21) is further forcibly tightened from this state, immediately before reaching the tightened state, the rotation preventing piece (28)
Abuts on the upper surface of the gentle inclined side (270) of the detent projection (27). Usually a cap nut (21) provided with a detent projection (27)
Alternatively, the connection body (20) including the rotation preventing piece (28) is not made of a material having only plastic deformability, but is made of a material having some elastic deformability such as metal or synthetic resin. Then, when further tightened from the above state, the lower end of the rotation preventing piece (28) is
0) gets over due to the deformation based on the elastic deformation ability, and the rotation preventing piece (28) is positioned forward in the direction in which the cap nut (21) is loosened with respect to the rotation preventing projection (27). In other words, the rotation preventing piece (28) and the rotation preventing protrusion (27) are loosened and one-way engaged in the rotation preventing state. In this example, the state shown in FIG. 5 is obtained in which the rotation preventing piece (28) is located between the rotation preventing protrusions (27) and (27).

Therefore, the turning power of the connected pipe (30) is increased by the cap nut.
(21), even if loose rotation force acts on this, the steep side (271) of the rotation preventing projection (27) and the rotation preventing piece (2
The loose rotation of the cap nut (21) is prevented by the engagement with the lower end of (8). Therefore, the inconvenience of water leaking from the connection between the connection main body (20) and the connected pipe (30) due to the loosening of the cap nut (21) can be avoided.

The rotation preventing projection (27) and the rotation preventing piece (2)
The number of arrangements in 8) may be singular or plural.
If the number of the rotation preventing projections (27) and the rotation preventing pieces (28) is increased, even if the screwing relationship between the cap nut (21) and the connection main body (20) varies, the cap nut ( In the tightened state of (21), any of the rotation preventing protrusions (27) is just over the rotation preventing piece (28), and the effect of preventing the cap nut (21) from loosening is increased. In the case where the rotation preventing projection (27) and the rotation preventing piece (28) are respectively one, the rotation preventing piece (28) and the rotation preventing There may be a gap or loose rotation allowance between them, but such inconvenience can be avoided when there are a plurality of the rotation preventing protrusions (27) and the rotation preventing pieces (28).

Further, in the above embodiment, the cap nut (21)
Although the detent protrusion (27) is projected from the upper end of the cap nut, a concave portion having a triangular cross section may be provided at the upper end of the cap nut (21) as the detent locking portion. Also in this case, it is desirable that the inclination of the inclined side engaging with the rotation preventing piece (28) in the direction for preventing the cap nut (21) from being loosened is increased. Also, when the concave portion is provided at the upper end of the cap nut (21), the number of the concave portion and the rotation preventing piece (28) engaged with the concave portion may be set to one or more.

Further, in the case of FIG. 5, the cap nut (2
The diameter of the through hole (210) at the lower end of (1) is larger than the outer diameter of the convex rib (31) at the upper end of the connected pipe (30), whereby the cap nut (21) is connected to the connected pipe (30). ) From the side of the convex rib (31). Therefore, even with this one, the washer (2
2) and the side wall of the cylindrical portion (24) connected to the lower end thereof has an axial slit formed therein, and the washer (22) is connected to the connected pipe.
It is configured so that it can be attached to (30) by winding it from its side.

However, the diameter of the through hole (210) on the lower surface of the cap nut (21) is made smaller than the outer diameter of the convex rib (31), and the cap nut (21) is placed below the connected pipe (30). In such a case, it is not necessary to cut slits in the side portions of the washer (22) and the cylindrical portion (24) to vertically divide them. Further, it is not always necessary to provide the washer (22). The cap nut (21) in the example shown in FIG. 5 may be configured as shown in FIGS.

6 and 7, the cap nut (2
At the open end of (1), follow the upper end of the female thread (211)
A plurality of triangular recesses (272) (272) that are open upward are provided in the inner peripheral portion of the annular wall portion (212) at positions equivalent to the circumference. And the recess (272)
Is closed by a part of the annular wall portion (212), and the outer ends of the concave portions (272) and (272) are connected to the connecting body (2).
0) is located outside the outer edge of the rotation preventing piece (28).

In this case, when the cap nut (21) is tightened, in the tightened state, the concave portion (272) has one side wall.
(29) (Front side wall in the screwing rotation direction of the cap nut (21))
Is engaged with the rotation preventing piece (28) in a loose rotation preventing state. When the cap nut (21) is tightened, the outer ends of the recesses (272) and (272) are
Since it is closed at a part of 12) and no sharp irregularities are exposed on the outer peripheral surface of the cap nut (21), it is safe to operate the cap nut (21) by hand. When the cap nut (21) is tightened, the lower end of the rotation preventing piece (28) is covered by a part of the annular wall (212), which is safe in this respect.

In addition, assuming that the same effects as in the above illustrated example are obtained, the cap nut (21) shown in FIG.
Collar (2) that protrudes outward from the base end of detent projection (27)
13) may be provided. Also in this case, when the cap nut (21) is tightened by hand,
3) protects the anti-rotation protrusion (27) and the rotation preventing piece (28).

The collar (213) may be provided on the cap nut (21) shown in FIGS. 6 and 7.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an example of use of a connecting tool to which the present invention is applied.

FIG. 2 is an explanatory view of a main part of a conventional example.

FIG. 3 is an exploded view of the connector according to the embodiment of the present invention.

FIG. 4 is a plan view of a washer (22).

FIG. 5 is an explanatory view of another embodiment.

FIG. 6 is a plan view showing a case where an annular wall portion (212) is provided on the cap nut (21).

FIG. 7 is a sectional view taken along line AA.

FIG. 8 is a sectional view of a cap nut (21) having a collar (213).

[Explanation of symbols]

 (10) ... Casing (20) ... Connection main body (21) ... Cap nut (22) ... Washer (25) ... Engagement concave part (26) ... Engagement convex part ( 28) ・ ・ ・ Rotation prevention piece (30) ・ ・ ・ Connected pipe (31) ・ ・ ・ Protrusion rib (T) ・ ・ ・ Flange

Claims (7)

(57) [Claims] 1. A connection pipe (20) having a tubular connection body (20), and a lower end portion of the connection body (20) which is attached to a lower end of the connection body (20) by a cap nut (21) so that the upper end thereof is in a locked state and relatively rotatable. 30), and a washer (22) interposed between a lower end of the connection main body (20) and a flange portion (T) of a lower end of the cap nut (21). The washer (22) is configured to engage with the main body (20) in a state of preventing relative rotation. The washer (22) is formed on the outer periphery near the upper end of the connected pipe (30) and is engaged with the washer (22) from above. The outer diameter of the convex rib (31) portion is set smaller than the diameter of the through hole (210) surrounded by the collar portion (T), and furthermore, the side wall of the washer (22) has a slit extending in the entire axial direction. A pipe connector characterized by cutting (S). 2. The connection main body (20) is engaged with an engagement projection (26) provided on one of the connection main body (20) and the washer (22) and an engagement recess (25) provided on the other. 2. The pipe connector according to claim 1, wherein said pipe connector is configured to engage with said washer in a state of preventing relative rotation. 3. A connecting body (20) having a cylindrical shape, and a connected pipe (20) which is attached to a lower end of the connecting body (20) by a cap nut (21) so that the upper end is in a locked state and relatively rotatable. 30), and a washer (22) interposed between a lower end of the connection main body (20) and a flange portion (T) of a lower end of the cap nut (21). With the cap nut (21) fastened to the main body (20), the cap nut is connected to the connection main body (20).
A convex rib (31) formed on the outer periphery near the upper end of the connected pipe (30) and engaged with the washer (22) from above; The outer diameter of the portion is set to be smaller than the diameter of the through hole (210) surrounded by the collar portion (T), and further, a slit (S) is cut through the entire side wall of the washer (22) in the axial direction. A pipe connector characterized by the following. 4. The locking portion provided on the cap nut (21) and the rotation preventing piece (28) protruding from the connection main body (20) are one-way when the cap nut (21) is in a state where the cap nut (21) is prevented from rotating. 4. The pipe connector according to claim 3, wherein said pipe connector is engaged. 5. The cap nut (21) or the connection main body (20) is made of an elastic material, and one of the cap nut (21) or the connection main body (20) when the cap nut (21) is in a tightened state. 5. The pipe connector according to claim 4, wherein the locking portion and the rotation preventing piece are one-way engaged with the cap nut in a state where the cap nut is prevented from loosening and rotating by a part or all of the elastic deformation. . 6. An open end of the cap nut (21) is provided with an annular wall portion following the female screw portion, the locking portion is provided on the inner periphery of the annular wall portion, and the cap nut (21) is provided. 6. The pipe connector according to claim 4, wherein the annular wall surrounds the lower end of the rotation preventing piece in the tightened state. 7. The pipe connector according to claim 4, wherein a flange portion projects from an open end of the cap nut (21).