JP7052963B2 - Fittings - Google Patents

Description

The present invention relates to a joint made of a resin material.

Conventionally, there is a joint made of a resin material for weight reduction (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2017-227242

By the way, when the male screw of the joint made of the resin material is screwed into the female screw of the other party, the operator does not know that the axis of the male screw is slightly tilted with respect to the axis of the female screw. , The male screw may be screwed in. When screwing a metal male screw and a female screw, if the axis of the male screw is slightly tilted with respect to the axis of the female screw, turn the male screw at the very early stage of screwing. Therefore, it can be easily determined that the axis of the male screw is not aligned with the axis of the female screw.

However, when the male screw is made of a resin material that is softer than metal, the force for turning the male screw is slightly heavier, but the thread on the tip side of the male screw is scraped by the female screw while the male screw is female. It may be screwed into the screw. In other words, the male screw may be damaged due to improper screwing, and there is room for improvement. Furthermore, in the case of a joint that handles fluid, fluid leakage may occur if the male and female screws are not properly screwed together.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a joint capable of suppressing inappropriate screwing.

The joint according to claim 1 has a hollow joint main body provided with a fluid flow path in an axial center portion, a male side connection portion provided in the joint main body and formed of a resin material, and the male side connection. A first male screw formed on the outer peripheral portion of the portion, a tip member made of a metal material provided at the tip of the outer peripheral portion of the male side connection portion, and a screw continuous with the thread of the first male screw. It has a second male screw formed on the outer peripheral portion of the tip member, and the boundary portion between the resin material and the tip member is exposed on the inner peripheral surface of the male side connection portion. Not.

In the joint according to claim 1, the male side connection portion can be screwed into the female screw to be connected.
Also in the joint of claim 1, the male side connection portion is erroneously screwed into the female screw in a state where the axis of the male side connection portion is tilted with respect to the axis of the female screw as in the conventional joint. However, in the joint of claim 1, a tip member having a second male screw made of a metal material, which is harder than the resin material, is provided at the tip of the male side connection portion. Since the male side connection cannot be turned at the very early stage of screwing, it can be easily determined that improper screwing is being performed, and improper screwing can be suppressed. can.

According to the second aspect of the present invention, in the joint according to the first aspect, the tip member is made of a metal material and is formed in a ring shape.

In the joint according to claim 2, since the tip member is formed of a metal material in a ring shape, the tip member can be easily manufactured by lathe processing the metal material.

The invention according to claim 3 is the joint according to claim 1 or 2, wherein the first male screw and the second male screw are tapered male screws.

In the joint according to claim 3, since the first male screw and the second male screw are tapered male screws, the sealing property when screwed to the female screw to be connected is compared with the parallel screw. Will be excellent. As the tapered male thread, the tapered male thread for pipes described in JIS B 0203 can be used as an example.

According to the fourth aspect of the present invention, in the joint according to the third aspect, the axial length of the tip member measured from the tip of the male side connection portion is the tapered male thread from the tip of the male side connection portion. The length is set to be less than or equal to the length obtained by subtracting the length of one pitch of the thread from the length in the axial direction to the position of the reference diameter of.

When the tapered male thread is properly screwed into the tapered female thread, the inclined surface of the thread of the tapered male thread and the inclined surface of the thread of the tapered female thread are in close contact with each other at the position of the reference diameter to obtain sealing performance. ..
In the joint according to claim 4, the axial length of the tip member measured from the tip of the male side connection portion is determined from the axial length from the tip of the male side connection portion to the position of the reference diameter of the tapered male thread. Since the length is set to be less than the length obtained by subtracting the length of one pitch of the thread, if the tapered male thread is properly screwed into the tapered female thread and screwed, at least one pitch of the thread (1). Since the inclined surface of the thread of the first male screw (tapered male thread) made of a resin material and the inclined surface of the thread of the tapered female thread are in close contact with each other, high sealing performance is ensured.
The reference diameter referred to here is, for example, the reference diameter described in JIS B 0203.

Since the joint according to the present invention has the above configuration, it has an excellent effect that inappropriate screwing can be suppressed.

It is a side view which made the joint which concerns on one Embodiment of this invention, and a part of the connection object with a cross section. It is sectional drawing which made a part part which shows the state which the joint which concerns on one Embodiment is screwed into a female screw to the connection target. It is sectional drawing which shows the main part of the male side connection part of the joint which concerns on one Embodiment of this invention. This is an excerpt of the main part of JIS B 0203.

A joint 20 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, the joint 20 according to the present embodiment is a so-called one-touch joint, and as an example, it is attached to the end of a pipe 10 made of synthetic resin or the like.

The joint 20 includes a tubular main body portion 22 and a tubular intermediate portion 24 externally attached to the main body portion 22. The main body portion 22 and the intermediate portion 24 are integrated to form a joint main body 26.

The hole penetrating the shaft core portion of the main body portion 22 is a flow path 27 through which the fluid passes.
An inner cylinder portion 22A having a diameter smaller than that of the rear end side is configured on the front end side (the side into which the pipe 10 is inserted) of the main body portion 22. The inner cylinder portion 22A is arranged on the inner peripheral side of the intermediate portion 24. Further, the fitting 20 includes a tubular sleeve 28. The sleeve 28 is extrapolated to the intermediate portion 24.

An insertion hole 30 into which the pipe 10 is inserted is configured between the intermediate portion 24 and the sleeve 28 and the inner cylinder portion 22A. The inner diameter of the insertion hole 30, that is, the outer diameter of the inner cylinder portion 22A is substantially the same as or slightly smaller than the inner diameter of the pipe 10. The outer diameter of the insertion hole 30, that is, the inner diameter of the intermediate portion 24 is substantially the same as or slightly larger than the outer diameter of the pipe 10.

Inside the sleeve 28, a lock ring 40 is arranged as a holding portion for holding the pipe 10 in the insertion hole 30. The lock ring 40 has an annular shape as a whole and has a substantially V-shape with a cross section rotated by 90 degrees. The lock ring 40 is arranged so that a substantially V-shaped opening faces the back side of the joint body 26 (the side opposite to the insertion side of the pipe 10). The opening of the lock ring 40 faces the tip 24A of the intermediate portion 24, and a part of the inner surface of the substantially V-shape is in contact with the tip 24A. A claw portion 42 is formed at a V-shaped tip arranged radially inside the lock ring 40. The tip of the claw portion 42 is sharp and has a shape that easily bites into the pipe 10.

A tapered surface 28A to which a substantially V-shaped outer surface of the lock ring 40 can abut is formed on the inner wall of the sleeve 28. The tapered surface 28A is formed so as to reduce its diameter toward the inlet 30A side of the insertion hole 30.

On the inner peripheral side of the sleeve 28, a release ring 32 that can move along the axial direction of the joint 20 is inserted on the inlet 30A side of the insertion hole 30 with respect to the lock ring 40. The release ring 32 has a substantially cylindrical shape, and the inner wall forms a part of the insertion hole 30. A protrusion 32A is formed on the outer periphery of the back side of the release ring 32 in the circumferential direction, and by contacting the small diameter portion 28B formed on the inner circumference of the sleeve 28, the release ring 32 is prevented from coming off from the sleeve 28. Has been done.

The tip portion 32B of the protrusion 32A has a tapered shape and is arranged along the outer peripheral surface on the inner side in the radial direction of the lock ring 40. The main body 22 is formed with two peripheral grooves 22B on the outer peripheral surface facing the insertion hole 30, and rubber O-rings 34 are fitted in the peripheral grooves 22B, respectively.

A wall surface 23 having an enlarged outer diameter is formed in the innermost portion of the insertion hole 30 on the innermost side of the peripheral groove 22B of the main body portion 22. The tip of the pipe 10 abuts on the wall surface 23, and the wall surface 23 serves as a stopper for the pipe 10. Further, on the side opposite to the insertion hole 30 of the main body portion 22, a tubular male side connecting portion 22C connected to the female screw 46 formed in the connection target 44 made of a metal material is formed. Further, in the axially intermediate portion of the main body portion 22, a hexagon nut portion 22D to which a spanner or the like can be engaged is formed on the insertion hole 30 side of the male side connecting portion 22C.

The female screw 46 formed on the connection target 44 is, for example, a pipe taper female screw described in JIS B 0203 (see the table in FIG. 4; the table in FIG. 4 is an excerpt of the main part of JIS B 0203). It is a taper female thread according to the above.

In the joint 20 of the present embodiment, the main body portion 22, the intermediate portion 24, the sleeve 28, and the release ring 32 are made of a resin material, and the lock ring 40 is made of a metal such as stainless steel.

As shown in FIG. 2, on the outer peripheral portion of the male side connecting portion 22C, a tip member 48 made of a metal material such as true chu (brass) or stainless steel is attached to the tip side opposite to the insertion hole 30. The tip member 48 is integrally joined with the resin material when the main body portion 22 is molded.

As an example, a first tapered male screw 50A as an example of the first male screw is formed on the outer peripheral surface of the male side connecting portion 22C. Further, a second tapered male screw 50B as an example of the second male screw is also formed on the outer peripheral portion of the tip member 48. The thread of the first tapered male screw 50A and the thread of the second tapered male screw 50B are continuous. Hereinafter, the first tapered male screw 50A and the second tapered male screw 50B are collectively referred to as the tapered male screw 50. The tapered male thread 50 is formed according to the tapered male thread for pipes (see the table of FIG. 4) described in JIS B 0203.

The inner diameter of the tip member 48 is larger than the inner diameter of the male side connection portion 22C (diameter of the flow path 27), and the end surface 48A on the right side (arrow R direction side) of the drawing of the tip member 48 is the male side connection portion 22C. The radial outer end of the end face is exposed on the outer peripheral portion of the male side connecting portion 22C.

On the other hand, the inner peripheral surface 48B of the tip member 48 is parallel to the axial direction of the male side connecting portion 22C, and is exposed to the end surface on the tip side of the male side connecting portion 22C.
In other words, the tip member 48 of the present embodiment has the male side connection portion 22C so that the boundary between the tip member 48 and the resin material of the male side connection portion 22C is not exposed to the flow path 27 of the male side connection portion 22C. It is attached.

The one-point difference line indicated by reference numeral A in FIG. 2 indicates the position of the reference diameter of the tapered male screw 50 (the position of the reference diameter in the table of FIG. 4). As an example, the tapered male thread 50 of the present embodiment is a tapered male thread for pipes whose nominal thread is R1 / 2 (see FIG. 4 for the dimensions of each part).

In order to screw the joint 20 of the present embodiment into the female screw 46 of the connection target 44 and secure the sealing property with the female screw 46, the tip member 48 exposed on the outer peripheral side (screw side) and the resin are used. The position of the boundary (end surface 48A) with the male side connection portion 22C is from the position A of the reference diameter to the tip side (arrow L direction side) of the male side connection portion 22C by one pitch of the thread of the tapered male screw 50. It is preferable to provide the male side connecting portion 22C at a position further separated from the position B separated by the length P toward the tip end side.

Further, if the combination of the tolerance of the tapered male thread 50 and the tolerance of the tapered female thread to be connected is considered to the maximum, the distance L from the tip of the male side connecting portion 22C to the boundary (end surface 48A) measured in the axial direction is male. Distance from the tip of the side connection 22C to the reference diameter position A (reference diameter length a: 8.16 mm in the table of FIG. 4) -Axial tolerance of the screw at the reference diameter position A (FIG. 4) Table b: 1.81 mm) -Axial tolerance of female thread of reference diameter (c: 2.27 mm in the table of Fig. 4) -Length P for one pitch of the thread of the tapered male thread 50 (Fig. 4) It is preferable that the pitch P in the table of 4 is 1.8143 mm; the length of one thread circumference) = 2.27 mm or less. That is, it is preferable that the first tapered male screw 50A having a length P + a tolerance of at least one pitch is on the tip end side of the position A of the reference diameter.
That is, it is preferable that the boundary between the tip member 48 and the resin material is arranged on the tip side of the position A of the reference diameter, and the resin material is relative to the female screw 46 formed on the connection target 44 made of the metal material. It is preferable to ensure the sealing property by closely adhering the screw threads made of the product.

(Action, effect)
The joint 20 of the present embodiment is provided with a tip member 48 having a second tapered male screw 50B made of a metal material that is harder than the resin material on the tip side of the male side connection portion 22C, so that the male side connection is made. When an attempt is made to screw in a state where the axis of the portion 22C is tilted with respect to the axis of the female screw 46, a second metal tapered male screw 50B and a metal female screw are inserted at the very initial stage of screwing. Since the male side connection portion 22C cannot be turned due to improper contact with the 46, it can be easily determined that improper screwing is performed, and as a result, the male side connection portion 22C can be easily determined. Inappropriate screwing can be suppressed.

When the male side connection portion 22C is properly screwed into the female screw 46, the slope of the thread of the male side connection portion 22C and the slope of the thread of the female screw 46 are in close contact with each other at the position A of the reference diameter. However, proper sealing performance is exhibited at the position A of the reference diameter.

Further, in the joint 20 of the present embodiment, the boundary (end surface 48A, inner peripheral surface 48B) between the tip member 48 and the resin material of the male side connecting portion 22C is a flow of the male side connecting portion 22C through which a fluid such as water passes. Since it is not exposed to the road 27, if the male side connection portion 22C is properly screwed into the female screw 46, there may be a gap between the tip member 48 and the resin material. However, the fluid passing through the flow path 27 does not leak to the outside.

When connecting the pipe 10 to the joint 20, the pipe 10 is inserted into the insertion hole 30 of the joint 20. Then, the tip of the pipe 10 expands the diameter of the lock ring 40, the pipe 10 is inserted into the back side while the outer peripheral surface of the pipe 10 is in sliding contact with the claw portion 42 of the lock ring 40, and the inner peripheral surface of the pipe 10 is an O-ring. Press it against 34. When the pipe 10 is further inserted, the tip of the pipe 10 reaches the wall surface 23 of the main body 22, and the connection is completed.

[Other embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that the present invention can be variously modified and implemented without departing from the gist thereof. Is.
In the joint 20 of the above embodiment, an example in which the pipe 10 is held by the lock ring 40 has been described, but the pipe 10 may be held from the outer peripheral side by another holding member, for example, a collet or the like, and the male side may be used. The configuration other than the connection portion 22C may have other conventionally known structures.
Further, the male side connecting portion 22C may be wound with a sealing tape around the outer peripheral portion and screwed into the female screw 46.

10 ... Joint, 22 ... Main body (joint body), 27 ... Flow path, 48 ... Tip member, 50A ... First tapered male thread (first male thread, tapered male thread), 50B ... Second tapered male thread (first) 2 male threads, tapered male threads), A ... reference diameter position, P ... length for one pitch of thread

Claims (4)

A hollow joint body with a fluid flow path at the center of the shaft,
A male side connection portion provided on the joint body and formed of a resin material,
The first male screw formed on the outer peripheral portion of the male side connection portion and
A tip member made of a metal material provided at the tip of the outer peripheral portion of the male side connection portion, and
A second male screw having a thread continuous with the thread of the first male screw and formed on the outer peripheral portion of the tip member, and a second male screw.
Have,
A joint in which the boundary portion between the resin material and the tip member is not exposed on the inner peripheral surface of the male side connection portion. The joint according to claim 1, wherein the tip member is made of a metal material and is formed in a ring shape. The joint according to claim 1 or 2, wherein the first male screw and the second male screw are tapered male threads. The axial length of the tip member measured from the tip of the male side connection portion is one pitch of the thread from the axial length from the tip of the male side connection portion to the position of the reference diameter of the tapered male thread. The joint according to claim 3, wherein the length is set to be less than or equal to the length obtained by subtracting the length of the minute.

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