JP2018054131A - Union joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a union joint capable of preventing damage of a water conduction part body by a C ring for union nut engagement to attain a sufficient fastening state of a union nut, even in a case where the water conduction part body is formed of synthetic resin.SOLUTION: When in an unloaded state, a projection line segment of one of end surfaces holding a cutout of a ring is defined as L1, a projection line segment of the other end surface is defined as L2, a lien passing through a ring inner diameter side end of the line segment L1 and a center of the ring is defined as L3, and a line passing through a ring inner diameter side end of the line segment L2 and the center of the ring is defined as L4, a C ring is formed so that for the one end surface, a ring outer diameter side of the line segment L1 is inclined in a diameter enlargement direction of the ring to the line L3, and a cross angle α1 between the line segment L1 and the line L3 is within a range of 5-45°; and for the other end surface, a ring outer diameter side of the line segment L2 is inclined in the diameter enlargement direction of the ring to the line L4, and a cross angle α2 between the line segment L2 and the line L4 is within a range of 5-45°.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a union joint.

By rotating the union nut, a union joint that can be connected to the other pipe body without rotating one pipe body connected to the water flow passage main body supplies a low-pressure fluid such as tap water. It is suitably used for connecting small-diameter pipes.
As a union joint, a union joint in which a union nut is rotatably mounted on one side of a water passage main body through a C ring in a state of being prevented from coming off has been proposed (for example, see Patent Document 1). .

  In the case of a union joint with such a structure, if the union nut and the water passage main body are made of metal such as gun metal or stainless steel, there was no influence of excessive tightening of the union nut, but the weight of the joint and cost reduction were attempted. For this reason, when the water passage main body is made of resin, (1) since the tightening torque is not applied to the cut portion of the C-ring, it is tightened unevenly, and (2) the C-ring rotates together when tightening There is a problem that the water flow passage main body is partially destroyed, such as a part of the water flow passage main body being scraped off at the end face of the C ring that sometimes sandwiches the cut of the C ring.

In addition, as shown in FIG. 11, in general, when the conventional C-ring 3x is orthogonally projected in the direction of the central axis of the ring, one end surface 37 sandwiching the cut of the ring appears as a line segment L10, and the other end surface 38 appears as a line segment L11.
When the line passing through the ring inner diameter side end 37a of the line segment L10 and the center O of the ring is L12, and the line passing through the ring inner diameter side end 38a of the line segment L11 and the center O of the ring is L13, the end face 37 is obtained. Is formed on an inclined surface where the ring outer diameter side of the line segment L10 is inclined with respect to the line L12 in the direction of diameter reduction of the ring and the crossing angle β between the line segment L10 and the line L12 is 0 to 45 °.
On the other hand, the end face 38 is formed on an inclined surface in which the ring outer diameter side of the line segment L11 is inclined in the ring expanding direction with respect to the line L13, and the crossing angle γ between the line segment L11 and the line L13 is 0 to 45 °. ing.

On the other hand, the present inventor has previously proposed a union joint Y as shown in FIG. 9 in order to solve the above problem.
As shown in FIG. 9, this union joint Y is formed with a water passage main body 100 made of synthetic resin, and is provided with a flange portion 110 projecting outward at one end of the water flow portion main body 100, and this flange portion 110 is a union. It is locked to a locking portion 210 provided so as to protrude inside the nut 200.

That is, according to this union joint Y, even if the water flow passage main body 100 is formed of a relatively inexpensive synthetic resin material, there is no problem as in the case of using a C-ring.
In the figure, even if 220 is a female thread portion and 230 is union nut 200 being tightened more than necessary, the outer peripheral edge portion of flange portion 110 pressed against locking portion 210 is crushed and bulged outward. , A groove that can accommodate the bulging portion, an outer cylindrical member that is fitted and integrated with the other end of the water passage main body 100, 500 is a cylindrical cap member, 600 is a waterproof rubber ring, and 700 is inserted A guide 800 is a retaining ring.

JP 2011-89598 A

However, in the structure like the union joint Y, the locking portion 210 is provided on the other end side of the water passage main body 100 as in the case where the outer cylinder member 400 is fitted and fixed to the water passage main body 100 in advance. If there is a portion having an outer diameter larger than the inner diameter, the union nut 200 cannot be attached to the water main body 100.
That is, there is a problem that there is a restriction in the assembly process of the joint component and the pipe connection structure on the other end side of the water passage main body 100 of the joint.

  Therefore, the inventor of the present invention thought that if the opening angle of the C-ring breaks, the resin breakage of the water passage main body will be eliminated even if the C-ring is used. The result was as follows.

From Table 1 above, if the opening angle is larger than 45 degrees, the C-ring is easily reduced or expanded, but it is difficult to evenly tighten the union nut. It was found that the resin breakage occurred when the water passage section body made of synthetic resin was scraped or bite by the joint end of the C-ring due to the tightening.
If the opening angle exceeds 20 degrees, the diameter can be increased and assembled. However, when the diameter is reduced, the two open end surfaces sandwiching the cuts abut each other, and the diameter cannot be reduced sufficiently. all right.
On the other hand, when the opening angle was 20 degrees or less, it was found that tightening could be performed uniformly if it could be mounted, and there was no scraping by the end face, but it was found that it could not be used in the conventional union joint structure.

  In view of the above circumstances, the present invention prevents damage to the water passage main body due to the C-ring for engaging the union nut even if the water passage main body is formed of a synthetic resin, so that the union nut is sufficiently tightened. Even if there is a part larger than the minimum inner diameter of the union nut on the opposite side of the union nut insertion part of the water passage main body, a union nut can be rotatably mounted on one end of the water passage main body. It aims to provide a union joint that can be.

    In order to achieve the above object, a union joint according to the present invention (hereinafter referred to as “union joint of the present invention”) has a C-ring on one side of a water passage main body in which a union nut is formed of a synthetic resin. Is a union joint that is rotatably mounted in a retaining state through the at least one union nut insertion portion of the water passage main body, and the C ring is smaller than the minimum inner diameter of the union nut. When the ring is orthographicly projected from the center axis direction in the no-load state, one end face sandwiching the cut of the ring is represented by a line segment L1, the other end face is represented by a line segment L2, and the line segment L1 When the line passing through the ring inner diameter side end and the center of the ring is L3, and the line passing through the ring inner diameter side end of the line segment L2 and the center of the ring is L4, the one end surface is on the ring outer diameter side of the line segment L1. Inclined in the direction of diameter expansion of the ring with respect to the line L3, the crossing angle α1 between the line segment L1 and the line L3 is formed to be 5 to 45 °, and the other end surface is outside the ring of the line segment L2. The radial side is inclined with respect to the line L4 in the direction of expanding the ring, and the intersection angle α2 between the line segment L2 and the line L4 is formed to be 5 to 45 °.

In the above-described union joint of the present invention, the crossing angle α1 between the line segment L1 and the line L3 and the crossing angle α2 between the line segment L2 and the line L4 are each limited to 5-45 °, preferably 20-40 °, Particularly preferably, the angle is 25 to 35 °. However, if the crossing angle is less than 5 °, the water passage main body may be scraped. On the other hand, if it exceeds 45 °, the inner diameter side of the ring becomes too acute and the water passage main body may be pierced.
Further, in the union joint of the present invention 4, as long as the crossing angle α1 and the crossing angle α2 are within a range of 5 to 45 °, any of α1 = α2, α1> α2, and α2> α1 may be used.
In the union joint of the present invention, the opening angle of the C-ring break is not particularly limited, but is preferably 0 to 20 °.

In the present invention, the C ring means a ring shape having a cut at one place in the circumferential direction of the ring.
Although the cross-sectional shape of the C-ring is not particularly limited, it may be circular or quadrangular. However, if the rectangular shape is used, the contact area with the water flow passage main body increases and torque is applied more uniformly, making it difficult for the resin to break. .

  The material of the C-ring is not particularly limited, but in consideration of corrosion resistance and strength, stainless steel and spring steel are preferable, but PPSU (polyphenylsulfone), PPS (polyphenylene sulfide), PES (polyethersulfone). ), Nylon (polyamide), POM (polyacetal), PC (polycarbonate) and the like.

  In the present invention, the union nut is preferably a metal material such as gun metal or stainless steel, but is not limited to a metal. For example, a nut, PPSU, PPS, PES, nylon in which a metal female thread portion is coated with a resin. It is also possible to apply to nuts made of POM and PC impregnated with glass fibers to improve the strength, and nuts made of a resin (PPSU, PES, etc.) having a strength equal to or higher than that of the joint body.

Furthermore, the structure of the connection part to the other piping on the opposite side to a union connection part is not specifically limited for the union joint of this invention. For example, a one-touch joint type such as ESLON MECHA YA-SRON Cachitte from Sekisui Chemical Co., Ltd., a compression joint type such as ESLON METACUT, or a header.
In the union joint of the present invention, it is preferable to form other members as much as possible from the resin material as well as the water passage main body.

In the union joint of the present invention, the synthetic resin constituting the water flow passage main body is not particularly limited, and examples thereof include PPSU, PPS, PES, nylon, POM, and PC.
Moreover, it is preferable that parts other than a water-passing part main body are formed as much as possible with the above synthetic resins in consideration of weight reduction and material cost.

In the union joint of the present invention, the opening angle of the C-ring cut is defined as the union joint from the direction of the central axis of the union nut in the product state before the union joint is connected to another pipe member by tightening the union nut. In the projected view of the C-ring in the mounted state when orthographicly projected, it means the crossing angle of two lines connecting the center of the union nut and the inner diameter side ends of both end faces sandwiching the cut of the C-ring. Therefore, there is a case where the unloaded C-ring before mounting (the opening angle before mounting of the C-ring in which no pressure is applied in the diameter increasing direction or the diameter reducing direction may be different. That is, the union joint is maintained while maintaining the diameter reducing state. May be incorporated into the
Even if it is 25 degrees in the no-load state, the diameter may be reduced and the C-ring may be attached to be 20 degrees or less.
In the case of a twisted C-ring, when the twist remains in the C-ring in the above product state, it means the crossing angle of two lines when flattened so as to be in a state without twist.

  As described above, the union joint of the present invention is a union joint in which a union nut is rotatably attached to one side of a water passage main body formed of synthetic resin in a state of being prevented from coming off through a C ring. When at least the maximum outer diameter of the union nut insertion portion of the water flow portion main body is smaller than the minimum inner diameter of the union nut, and the C ring is orthographically projected from its central axis direction in an unloaded state, One end surface sandwiching the ring cut is represented by a line segment L1, the other end surface is represented by a line segment L2, and a line passing through the ring inner diameter side end of the line segment L1 and the center of the ring is represented by L3. When the line passing through the ring inner diameter side end of L2 and the center of the ring is L4, the one end face is inclined while the ring outer diameter side of the line segment L1 is inclined in the ring diameter increasing direction with respect to the line L3. L And the line L3 is formed so that the crossing angle α1 is 5 to 45 °, and the other end face of the line segment L2 has a ring outer diameter side inclined with respect to the line L4 in the ring expanding direction, The intersection angle α2 between the minute L2 and the line L4 is formed to be 5 to 45 °.

  That is, the union joint of the present invention can prevent the resin of the water passage main body from being scraped in the direction in which the end face does not scrape the resin against stress regardless of whether the C-ring is in the front or back side.

It is sectional drawing showing 1st Embodiment of the union joint of the reference example 1 of this invention. It is a figure explaining the assembly method of the water flow part main body and union nut of the union joint of FIG. It is a perspective view explaining the principal part of the water flow part main body of the union joint of FIG. It is sectional drawing of the C ring mounting part of the union joint of FIG. It is sectional drawing showing 1st Embodiment of the union joint of the reference example 2 of this invention. It is sectional drawing explaining the state which fitted the resin ring of the union joint of FIG. 5 to the water-passing part main body. It is a front view of C ring of the union joint of the reference example 3 of this invention. The modification of a C ring is shown, The figure (a) is a front view, The figure (b) is sectional drawing. It is sectional drawing showing the union joint which this inventor proposed previously. It is the figure which carried out orthographic projection from the central-axis direction of the ring for the C ring used for the union joint of this invention. It is the figure which carried out orthographic projection from the central-axis direction of the ring of C ring used for the conventional union joint.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
FIG. 1 shows a first embodiment of a union joint of Reference Example 1 of the present invention.

As shown in FIG. 1, the union joint A includes a water passage main body 1a, a union nut 2a, a C ring 3a, an outer cylinder member 4, a cylindrical cap 5, a water stop rubber ring 6, and an insertion. Equipped with a guide 7 and a retaining ring 8, for example, connecting a water and hot water pipe such as a cross-linked polyethylene pipe connected to a faucet, a water heater connection port, a water pipe connection port, a header branch connection port, etc. Used to do.
The water passage main body 1a has a smaller diameter than the inner diameter of the locking projection, which is the smallest diameter portion of the union nut 2a, which will be described later, and is a synthetic resin such as PPSU, PPS, PES, nylon, POM, and PC. It is formed with.

Moreover, as shown to FIGS. 1-3, the water flow part main body 1a is provided with the large diameter part 11 in the union nut insertion side edge part.
The large-diameter portion 11 has an outer diameter that is substantially larger by the cross-sectional diameter of the C-ring 3a than the inner diameter when the union nut 2a is mounted so as to be prevented from coming off from the water main body 1a via a C-ring 3a described later. doing.

Further, the water passing portion main body 1a has an inner diameter that is substantially the same as the inner diameter when the union nut 2a is attached to the water passing portion main body 1a through the C ring 3a adjacent to the large diameter portion 11 so as to be prevented from coming off. The fitting part 12 of the C-ring 3a is provided.
A protrusion 13 is provided in a part of the circumferential direction of the fitting portion 12 so as to enter between the end surfaces 31 and 32 on both sides of the cut of the C ring 3a.

The union nut 2a is made of gunmetal or stainless steel, has a locking portion 21 projecting in a ring shape toward the inside in the radial direction on one side, and a female screw portion 22 that is a parallel screw on the other side.
The locking portion 21 includes an engagement groove 21a into which the outer half of the C ring 3a is fitted on the inner peripheral surface thereof.

The C ring 3a is made of a spring steel wire having a circular cross section, and the opening angles of the end faces 31 and 32 on both sides sandwiching the cut portion are 20 degrees.
As shown in FIG. 2 (a), the C-ring 3a has the large-diameter portion 11 side as the head, and the union nut insertion portion of the water flow passage main body 1a as shown in FIG. After being inserted from the side so as to face the female screw portion 22, the C-ring 3a externally fitted to the water passage main body 1a is pushed into the ring engaging groove 21a of the union nut 2a while reducing the diameter.
Next, by pushing the union nut 2a toward the large diameter portion 11 so that the C ring 3a fits into the fitting portion 12 in a state where the cut of the C ring 3a coincides with the protrusion 13, the union nut is The water flow passage main body 1a is rotated and prevented from coming off.

The outer cylinder member 4 is made of a transparent synthetic resin such as PPSU, PPS, PES, nylon, POM, PC, etc., and is externally fitted to the water passage main body 1a and is cross-linked polyethylene between the water passage main body 1a. An insertion space for a pipe for water supply or hot water supply to which a pipe or the like is connected is formed.
The cylindrical cap 5 is formed of a synthetic resin such as PPSU, PPS, PES, nylon, POM, PC, and the like, and the opening end side of the outer cylindrical member 4 is substantially the same as the outer diameter of the water / hot water supply pipe connected to the above. The tube is closed while leaving a tube insertion port having the same inner diameter, and is fitted to the outer cylinder member 4 so as to sandwich a peripheral edge portion of a retaining ring 8 to be described later with the outer cylinder member 4.

The water-stop rubber ring 6 is formed of EPDM (ethylene-propylene-diene copolymer rubber) and is externally fitted in a groove provided in the water passage main body 1a.
The insertion guide 7 is made of stainless steel, engineering plastic or the like, and is provided to protect the periphery of the water stop rubber ring 6 until the water supply / hot water supply pipe is inserted and connected from the cylindrical cap 5 side. Yes.
The retaining ring 8 is formed by punching and bending a stainless steel plate. When a force in the pulling direction is applied to the once-connected crosslinked polyethylene pipe, there are a number of locking claws that bite into the outer peripheral surface of the crosslinked polyethylene pipe and prevent it from coming off. Projects radially inward.

The union joint A is configured as described above, and although not shown, for example, a flexible resin pipe such as a crosslinked polyethylene pipe or a polybutene pipe connected to a water heater and a faucet as follows. Can be connected.
That is, a seal packing made of an unillustrated ring-shaped ethylene-propylene-diene copolymer rubber is connected to an end surface of the external thread cylinder on an external thread cylinder provided on the hot water heater side (not shown). Screw in until it is compressed tightly with the end face of the locking portion 21.
The seal packing may be attached to the end face of the male screw cylinder or the end face of the locking portion 21 in advance.

Next, the end portion of the flexible resin pipe is inserted into the cylindrical space between the outer cylinder member 4 and the water passage main body 1a from the cylindrical cap 5 side.
In the insertion, the distal end surface of the flexible resin pipe first hits the flange portion of the insertion guide 7. When the insertion is further performed, the distal end surface of the flexible resin pipe connects the insertion guide 7 to the back side (union nut) of the outer cylinder member 4. Side) And the water stop rubber ring 6 is exposed and the water stop rubber ring 6 is press-contacted to the internal peripheral surface of flexible resin piping. Further, the flexible resin pipe once inserted is prevented by the retaining ring 8. That is, the flexible resin pipe is connected to the union joint A with a single touch.

As described above, the union joint A has a maximum outer diameter on the union nut insertion portion side of the water passage main body 1a smaller than an inner diameter of the locking portion 21 which is the minimum inner diameter of the union nut 2a. Although the outer diameter is larger than the inner diameter of the locking portion 21 of 2a, the union starts with the large-diameter portion 11 on the union nut insertion portion side even if the outer cylinder member 4 is mounted in the water passage main body 1a in advance. A union nut insertion portion can be inserted into the nut 2a. And if C ring 3a is mounted | worn, the union nut 2a can be rotatably mounted | worn to the water-passage part main body 1a.
Also. Since the projection 13 that enters the cut of the C-ring 3a when the union nut is mounted is provided, it is possible to suppress the co-rotation of the C-ring 3a due to the rotation of the union nut 2a.
Therefore, the large-diameter portion 11 is not scraped by the co-rotation of the C ring 3a when the union nut 2a is tightened, and the water passage main body 1a itself is not broken. That is, it is possible to prevent an accident in which the large-diameter portion 11 is scraped or leaks due to the destruction of the water passage main body 1a itself. In addition, since the protrusions are fitted between the cuts, almost uniform tightening can be performed over the entire circumference of the large diameter portion 11.

  Further, if the union nut 2a of the union joint A is rotated so as to be loosened, the union joint A can be detached from the water heater, and maintenance and inspection of the water heater can be performed.

FIG. 5 shows an embodiment of a union joint of Reference Example 2 of the present invention.
As shown in FIG. 5, in this union joint B, the fitting part 14 of the C ring 3b of the water flow passage main part 1b does not have the projection 13 like the union joint A, and the resin ring 9 is fitted to the fitting part 14. The surface of the C-ring 3b on the union nut tightening direction side is adapted to be received by the resin ring 9, and the C-ring 3b is used except that the opening angle of the cut is 45 degrees. The union joint A is similar to the above.

The resin ring 9 is formed of polyphenylsulfone (PPSU), polyphenylene sulfide (PPS), polyethersulfone (PES), polyamide (nylon), polyacetal (POM), polycarbonate (PC), or the like.
Then, as shown in FIG. 6, the union joint B has a resin ring 9 fitted before the outer cylinder member 4 is fitted to the water main body 1 b, with the large-diameter portion 11 side at the top. It is assembled by inserting into the union nut B and mounting the C ring 3b in the same manner as the union joint A.

In the union joint B, as described above, the maximum outer diameter on the union nut insertion portion side of the water flow passage main body 1b is smaller than the inner diameter of the locking portion 21 which is the minimum inner diameter of the union nut 2b. Although the outer diameter is larger than the inner diameter of the locking portion 21, the union nut 2 b starts from the large-diameter portion 11 on the union nut insertion portion side even if the outer cylinder member is mounted in the water passage main body 1 a in advance. A union nut insertion part can be inserted therein. And if C ring 3a is mounted | worn, it can mount | wear with the union nut 2b rotatably to the water-passage part main body 1b.
Further, since the resin ring 9 whose outer diameter is smaller than the minimum inner diameter of the union nut is fitted to the water passage main body 1b so as to receive the surface of the C-ring 3b on the tightening direction side of the union nut B, the union When the C ring 3b tries to rotate together with the tightening of the nut B, the resin ring 9 rotates together with the C ring 3b. Therefore, it is possible to prevent an accident in which the large-diameter portion 11 is scraped by the C-ring 3b and water leakage is caused by the destruction of the water passage main body 1a itself.
Moreover, since the force applied to the C ring from the engaging portion 21 of the union nut B is applied to the water passage main body through the resin ring 9, the force is uniformly transmitted through the resin ring 9. That is, uniform tightening can be performed. Further, the opening angle of the cut of the C-ring 3b can be set to a large angle that facilitates the reduced diameter assembly and the increased diameter assembly.

FIG. 7 shows a C-ring used in the first embodiment of the union joint of Reference Example 3 of the present invention.
The union joint has the same configuration as the union joint B except that the resin ring 9 is not used and the C ring 3c shown in FIG. 7 is used as the C ring.
That is, the C-ring 3c is formed by twisting so that the end faces 33, 34 on both sides of the cut of the C-ring 3c are three-dimensionally displaced in the central axis direction, and the diameter can be reduced without the end face 33.34 hitting at the time of diameter reduction. In a state where the flat surfaces are formed so as to eliminate the twist and the end surfaces 33 and 34 face each other, the opening angle between the end surfaces 33 and 34 is 20 degrees or less, preferably 0 to 10 degrees. Yes.

Since the union joint is formed by twisting the end faces 33.34 on both sides of the cut of the C-ring 3c so as to be three-dimensionally displaced in the central axis direction as described above, even if the end faces 33, 34 are reduced in diameter. Even if the opening angle is small, the reduced diameter assembly is possible.
Moreover, when the flat state is set so as to eliminate the twist, and the facing state in which the central axes of both ends 33 and 34 coincide with each other, the opening angle between the end surfaces 33 and 34 is 20 degrees or less, so the union nut B is tightened. However, it is possible to prevent an accident that the large-diameter portion 11 is scraped by the C ring 3c or causes water leakage due to destruction of the water passage main body 1a itself.

FIG. 8 shows a C-ring used in the second embodiment of the union joint of Reference Example 1 of the present invention.
This union joint is the same as the above union joint A except that a C-ring 3d made of a spring steel wire having a square cross section shown in FIG. 8 is used.

  Since this union joint uses the C-ring 3d made of a spring steel wire having a square cross section as described above, the contact area with the large-diameter portion 11 of the water flow passage main body 1b increases, and torque is more evenly distributed. For this reason, it is possible to further prevent accidents that cause the leakage of the large diameter portion 11 due to the C ring 3c and the leakage of the water passage main body 1b itself.

FIG. 10 shows an example of a C-ring used for the union joint of the present invention.
The union joint has the same configuration as the union joint B except that the resin ring 9 is not used and the C ring 3e shown in FIG. 10 is used as the C ring.

The C ring 3e is formed so as to satisfy all of the following conditions.
(1) As shown in FIG. 10, when projecting in the direction of the center axis of the ring (the axis perpendicular to the plane in FIG. 10 passing through the center O), both end faces 35 and 36 of the ring sandwiching the cut line of the ring are respectively lines. It is represented by a minute L1 or a line segment L2.
(2) When the line passing through the ring inner diameter side end 35a of the line segment L1 and the center O of the ring is L3, one end surface 35 is the ring diameter increasing direction of the ring L1 of the line segment L1 with respect to the line L3. And the intersection angle α1 between the line segment L1 and the line L3 is 5 to 45 °.
(3) When the line passing through the ring inner diameter side end 36a of the line segment L2 and the center O of the ring is L4, the other end surface 36 is such that the ring outer diameter side of the line segment L2 is in the diameter expansion direction of the ring with respect to the line L4. The crossing angle α2 between the line segment L2 and the line L4 is 5 to 45 ° (in this embodiment, the same angle as the crossing angle α1).

The union joint using the C ring 3e is in a direction in which neither of the end faces 35 and 36 scrape the resin against the stress, regardless of whether the C ring 3e is mounted on the front or back side. The resin of the part main body 1b can be prevented from being scraped. Therefore, when the union nut 2b is screwed in, it is possible to prevent an accident in which the large-diameter portion 11 is scraped due to the co-rotation of the C ring 3e, or water leakage is caused by the destruction of the water passage main body 1b itself.
That is, when the end surface 37 in which the ring outer diameter side of the line segment L10 is inclined in the diameter reducing direction of the ring is formed as in the C ring 3x in FIG. 11, the end surface 37 is rotated in the direction that rotates together when the union nut is screwed. When the C ring 3x is set toward the load, a load is applied in the direction of reducing the diameter of the C ring 3x due to the tightening torque, and when the C ring 3x rotates together, the end portion 37 of the C ring 3x causes the water passing portion main body. The large diameter part 11 of 1b will be shaved.

Example 1
The resin ring is not provided, and the C-ring shown in FIG. 10 having α1 and α2 of 30 degrees is provided so that the opening angle of the C-ring in the product state is 10 degrees. A union joint was produced.

(Example 2)
The resin ring is not provided, and the C-ring shown in FIG. 10 having α1 and α2 of 10 degrees is provided so that the opening angle of the C-ring in the product state is 10 degrees. A union joint was produced.

(Comparative Example 1)
The resin ring is not provided, and the C-ring having α1 and α2 of −30 degrees shown in FIG. 10 is provided so that the outer diameter side ends of the C-ring in the product state are in contact with each other. A union joint was produced.

(Comparative Example 2)
10 except that the resin ring is not provided, and the C-ring having α1 and α2 of −10 degrees shown in FIG. 10 is provided so that the outer diameter side ends of the C-ring in the product state are in contact with each other. A union joint was produced.

  The union joints obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated for tightening. As a result, the union joints of Examples 1 and 2 were not scraped in the water passage main body. However, in the case of the union joints of Comparative Examples 1 and 2, the water passage main body was scraped.

The union joint of the present invention is not limited to the above embodiment. For example, in the union joint of the present invention, the same resin ring as that of the union joint of Reference Example 2 may be used in combination.
Moreover, in the said embodiment of this invention, although crossing angle (alpha) 1 and crossing angle (alpha) 2 were the same angles, as long as it is the range of 5-45 degrees, you may differ.

A, B Union joint 1a, 1b Water-passing part main body 11 Large-diameter part 12, 14 Fitting part 13 Projection 2a, 2b Union nut 21 Locking part 21a Ring engaging groove 22 Female thread part 3a, 3b, 3c, 3d, 3e C ring 31, 32, 33, 34, 35, 36 End face 35a, 36a Ring inner diameter side end 4 Outer cylinder member 5 Cylindrical cap 6 Water blocking rubber ring 7 Insertion guide 8 Retaining ring 9 Resin ring L1, L2 Line segment L3 , L4 Line α1, α2 Crossing angle O center (center of ring)

Claims (1)

A union nut is a union joint that is rotatably attached to one side of a water flow passage main body formed of synthetic resin in a retaining state via a C ring,
At least the maximum outer diameter of the union nut insertion portion of the water passage main body is smaller than the minimum inner diameter of the union nut, and
When the ring is orthographically projected from the central axis direction in the unloaded state, one end face sandwiching the cut of the ring is represented by a line segment L1, and the other end face is represented by a line segment L2.
When the line passing through the ring inner diameter side end of the line segment L1 and the center of the ring is L3, and the line passing through the ring inner diameter side end of the line segment L2 and the center of the ring is L4,
The one end face is formed so that the ring outer diameter side of the line segment L1 is inclined in the ring expanding direction with respect to the line L3, and the intersection angle α1 between the line segment L1 and the line L3 is 5 to 45 °. And
The other end face is formed so that the ring outer diameter side of the line segment L2 is inclined in the ring expanding direction with respect to the line L4, and the crossing angle α2 between the line segment L2 and the line L4 is 5 to 45 °. Union joints characterized by being made.

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