JP2018200073A - Pipe joint - Google Patents

Abstract

To provide a pipe joint capable of suppressing cracking of a cap, and crushing of the concave and convex shape of a fitting part of the cap and an outer cylindrical member, in fitting the cap to the outer cylindrical member, regardless of a material of the cap.SOLUTION: In a pipe joint including a cylindrical main body member defining a pipe conduit by an inner peripheral face, an outer cylindrical member disposed at an outer peripheral side of the main body member, and defining an insertion space to insert a pipe-shaped body to an axial first side, with the main body member, and a cap fitted to an outer peripheral face of the outer cylindrical member, the outer cylindrical member has a slit opened at an end of the axial first side of the outer cylindrical member, extended to an axial second side, and terminated before reaching an end of the axial second side of the outer cylindrical member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint used for piping for water supply or hot water supply, for example.

  As a conventional pipe joint, an insertion space for inserting a tubular body is defined between a cylindrical main body member defining a pipe line by an inner peripheral surface and an outer cylindrical member disposed on the outer peripheral side of the main body member. However, there is one in which a cylindrical cap is fitted into the outer peripheral surface of the outer cylinder member by press-fitting (for example, Patent Document 1).

JP-A-2017-72155

  In the pipe joint as described above, the cap receives a force in the diameter increasing direction from the outer cylinder member when the cap is fitted into the outer cylinder member by press fitting. At this time, the cap may be cracked. Further, at this time, there is a possibility that the uneven shape of the fitting portion between the inner peripheral surface of the cap and the outer peripheral surface of the outer cylinder member is crushed (for example, a pin angle can be taken). When the concave and convex shape of the fitting portion is crushed, when a force in the pulling direction is applied to the tubular body once inserted into the insertion space, the cap is easily detached from the outer cylindrical member, and as a result, the tubular body is inserted into the insertion space. There is a possibility that the tubular body may come out because it cannot be held inside. In order to suppress these problems, it is necessary to select a material for the cap that can be expanded and deformed to such an extent that the cap can be sufficiently expanded and deformed during press-fitting and has a sufficiently high strength. was there. For this reason, the selection range of the cap material is narrow, which leads to an increase in cost.

  The present invention is for solving the above-described problems, and is not affected by the material of the cap. When the cap is fitted into the outer cylinder member, the cap is broken or the fitting portion between the cap and the outer cylinder member is provided. It is an object of the present invention to provide a pipe joint that can suppress crushing of the uneven shape.

The pipe joint of the present invention is disposed on the outer peripheral side of the cylindrical main body member and the main body member, which divides the pipe line by the inner peripheral surface, and the tubular body is disposed on the first axial side between the main body member. A pipe joint comprising an outer cylinder member that divides an insertion space for insertion from an outer cylinder, and a cap that is fitted to an outer peripheral surface of the outer cylinder member, wherein the outer cylinder member is the outer cylinder It has a slit that opens at the end on the first axial side of the member, extends to the second axial side, and terminates before reaching the second axial end of the outer cylindrical member.
According to the pipe joint of the present invention, without depending on the material of the cap, when the cap is fitted into the outer cylinder member, cracking of the cap or crushing of the uneven shape of the fitting portion between the cap and the outer cylinder member, Can be suppressed.

In the pipe joint of the present invention,
The slit has a narrow slit portion that opens to an end of the outer cylinder member on the first axial direction side and extends to the second axial direction side, and has a slit width larger than the narrow slit portion. It is preferable to have a wide slit portion extending from the end on the second axial side of the narrow slit portion to the second axial side.
Thereby, the quantity of the material which comprises an outer cylinder member can be reduced, making it possible to suppress diameter-expansion deformation of the tubular body inserted in the insertion space reliably by the outer cylinder member.

In the pipe joint according to the present invention, the pipe joint is disposed in an annular groove formed on the outer peripheral surface of the main body member, and in a state where the tubular body is inserted into the insertion space, between the main body member and the tubular body. It is preferable that a sealing member for fluid-tight sealing is further provided, and the narrow slit portion is in an axial position overlapping the sealing member.
Thereby, the amount of the material constituting the outer cylinder member while suppressing the diameter expansion deformation of the tubular body inserted into the insertion space by the outer cylinder member and surely suppressing the separation of the tubular body from the sealing member. Can be reduced.

In the pipe joint according to the aspect of the invention, it is preferable that the wide slit portion has a circular shape in a plan view of the slit.
Thereby, when the cap is fitted into the outer cylinder member, cracking of the cap and collapse of the concavo-convex shape of the fitting portion between the cap and the outer cylinder member can be more effectively suppressed.

  According to this invention, without depending on the material of the cap, when the cap is fitted into the outer cylinder member, it is possible to suppress cracking of the cap and collapse of the concavo-convex shape of the fitting portion between the cap and the outer cylinder member. Can provide pipe fittings.

It is a partial section side view showing the pipe joint concerning one embodiment of the present invention in the state before a tubular body is inserted. It is a partial cross section side view which shows the pipe joint of FIG. 1 in the state by which the tubular body was inserted. Fig.3 (a) is a side view which shows a part of pipe joint of FIG. 1, FIG.3 (b) is a perspective view which shows the outer cylinder member of Fig.3 (a). It is a decomposition | disassembly side view for demonstrating a mode when a cap is engage | inserted by an outer cylinder member at the time of manufacture of the pipe joint of FIG. Fig.5 (a) is a side view which shows a part of pipe joint which concerns on the 1st modification of this invention, FIG.5 (b) is a perspective view which shows the outer cylinder member of Fig.5 (a). . FIG. 6A is a side view showing a part of a pipe joint according to a second modification of the present invention, and FIG. 6B is a perspective view showing the outer cylinder member of FIG. . It is a perspective view which shows the outer cylinder member of the pipe joint which concerns on the 3rd modification of this invention. It is an expanded sectional view showing a part of pipe joint concerning the 4th modification of the present invention.

  Hereinafter, an embodiment of a pipe joint according to the present invention will be described by way of example with reference to the drawings.

1-4 is drawing for demonstrating the pipe joint 1 which concerns on one Embodiment of this invention.
1 and 2 show a pipe joint 1 according to this embodiment. 1 and 2, one side (the upper side in the figure) of the pipe joint 1 with respect to the pipe axis O shows a cross section along the axial direction of the pipe joint 1, and the other side (the figure (Lower side) shows a side surface of the pipe joint 1. In FIG. 1, the pipe joint 1 is in a state before the tubular body 200 is inserted, and in FIG. 2, the pipe joint 1 is in a state in which the tubular body 200 is inserted.
In this specification, the pipe axis O of the pipe joint 1 is the central axis of the pipe line defined inside the pipe joint 1. The axial direction of the pipe joint 1 is a direction parallel to the pipe axis O of the pipe joint 1. Further, a direction perpendicular to the axial direction of the pipe joint 1 is referred to as “axial direction”.
Hereinafter, for convenience of explanation, one side in the axial direction of the pipe joint 1 (left side in FIGS. 1 and 2) is referred to as “first side in the axial direction”, and the other side in the axial direction of the pipe joint 1 (FIGS. 1 and 2). (Right side) is referred to as “second axial direction side”.

In this example, an insertion connection port 30 configured to connect the tubular body 200 to the pipe joint 1 by inserting the tubular body 200 is formed on the first side in the axial direction of the pipe joint 1. Yes. The tubular body 200 connected to the insertion connection port 30 is preferably, for example, a resin pipe, and is particularly preferably a polybutene or cross-linked polyethylene water supply / hot water pipe.
In the example of the figure, the pipe joint 1 is configured in a substantially I-shape (the whole is approximately one linear shape), but is substantially L-shaped, substantially T-shaped, substantially Y-shaped, substantially cross-shaped, etc. You may comprise in arbitrary shapes.

The pipe joint 1 of this example includes a main body member 17, an outer cylinder member 15, a sealing member 14, a cap 11, a lock claw 13, and a release ring 12. The axial direction first side portion 171 of the main body member 17 constitutes an inner cylinder portion (hereinafter also referred to as “inner cylinder portion 171”). The outer cylinder member 15 is disposed on the outer peripheral side of the main body member 17. More specifically, the axial second side portion 152 of the outer cylinder member 15 is fitted into the outer peripheral surface of the main body member 17. In the outer cylinder member 15, the extending portion 151 extending from the second axial side portion 152 to the first axial direction side is spaced from the outer cylindrical side of the inner cylindrical portion 171 of the main body member 17. Part (hereinafter also referred to as “outer cylinder part 151”). An annular insertion space 16 is defined between the outer peripheral surface of the inner cylindrical portion 171 of the main body member 17 and the inner peripheral surface of the outer cylindrical portion 151 of the outer cylindrical member 15. The insertion space 16 is configured such that the first axial side is open and the second axial side is closed, and the tubular body 200 is inserted from the first axial side to the second axial side.
In this specification, the direction in which the tubular body 200 is inserted into the insertion space 16, that is, the direction from the first axial direction side to the second axial direction direction along the axial direction is referred to as “insertion direction ID”. A direction in which 200 is pulled out from the insertion space 16, that is, a direction from the second axial direction side to the first axial direction side along the axial direction is referred to as “pulling direction PD”.
The inner cylinder part 171, the sealing member 14, the outer cylinder part 151, the cap 11, the lock claw 13, and the release ring 12 constitute an insertion connection part 30.

The main body member 17 is configured in a cylindrical shape, and a pipe line (flow path) for fluid such as water or hot water is defined by an inner peripheral surface thereof. The main body member 17 is made of metal (for example, brass) in this example, but may be made of resin.
The main body member 17 of this example is located on the first axial direction side and constitutes the inner cylindrical portion, the first axial direction side portion 171, the second axial direction side portion 172 located on the second axial direction side, and the axial line And an axial intermediate portion 176 positioned between the direction first side portion 171 and the axial direction second side portion 172.
In the example of FIG. 1, the axially second side portion 172 of the main body member 17 is formed with a threaded portion 172a made of a tapered or parallel male screw on its outer peripheral surface, and has a tapered or parallel female screw. It can be connected to a pipe member (not shown) by screwing. However, the present invention is not limited to the example shown in the drawing, and the axially second side portion 172 has a threaded portion 172a formed of a tapered or parallel female thread on its inner peripheral surface, and has a tapered or parallel male thread. It may be configured to be connectable with a member (not shown) by screwing. Alternatively, the insertion connecting portion 30 may be configured also in the second axial direction second side portion 172 of the main body member 17 as in the first axial direction side portion 171 of the present example.
In the example of FIG. 1, the axial direction intermediate portion 176 of the main body member 17 includes a torque input portion 173, a small diameter portion 174, and a large diameter portion 175 in order from the second axial direction to the first axial direction. Have. The torque input portion 173 of the main body member 17 has a substantially polygonal shape (substantially hexagonal shape in the example in the figure) on the outer peripheral surface, so that the torque from a tool such as a wrench (spanner) can be securely received. It is configured to allow input. The small diameter portion 174 of the main body member 17 has a smaller outer diameter than the torque input portion 173 and the large diameter portion 175. The axial second side portion 152 of the outer cylinder member 15 is fitted on the outer peripheral surface of the small diameter portion 174 of the main body member 17 by press fitting, and the axial direction is determined by the torque input portion 173 and the large diameter portion 175 of the main body member 17. Movement is regulated. The large diameter portion 175 of the main body member 17 has a larger outer diameter than the first axial side portion 171 (inner cylinder portion) of the main body member 17. As a result, as shown in FIG. 2, when the tubular body 200 is pointed into the insertion space 16, the tubular body 200 hits the large-diameter portion 175, thereby restricting further movement in the insertion direction ID. . The end surface on the first axial direction side of the large-diameter portion 175 defines the second axial end of the insertion space 16.

An annular groove 171 a extending in the circumferential direction is formed on the outer peripheral surface of the inner cylinder portion 171 of the main body member 17. In the illustrated example, the two annular grooves 171a are provided at different axial positions, but the number of the annular grooves 171a may be only one, or may be three or more. In the example of the figure, the annular groove 171 a is located in the middle of the insertion space 16 in the axial direction, and is in an axial position overlapping the outer cylinder portion 151 of the outer cylinder member 15. An annular sealing member 14 extending in the circumferential direction is accommodated in each annular groove 171a. The sealing member 14 is made of, for example, an O-ring.
As shown in FIG. 1, in the state where the tubular body 200 is not inserted into the insertion space 16, the outer diameter of the sealing member 14 is slightly larger than the outer diameter of the inner cylindrical portion 171 of the main body member 17. Yes. As shown in FIG. 2, when the tubular body 200 is inserted into the insertion space 16, the sealing member 14 is compressed and deformed so as to be in close contact with the inner peripheral surface of the tubular body 200, and the outer peripheral surface of the inner cylindrical portion 171. And the inner peripheral surface of the tubular body 200 are fluid-tightly sealed.

The outer cylinder member 15 is formed in a cylindrical shape, and is disposed on the outer peripheral side of the main body member 17 and on the inner peripheral side of the cap 11. The outer cylinder member 15 is preferably made of a resin, for example, and is preferably made of a transparent resin (for example, transparent nylon). The tubular body 200 inserted into the insertion space 16 tends to expand in diameter while a high-temperature and / or high-pressure fluid flows in the tubular body 200, but the outer cylinder member 15 is formed of such a tubular body 200. It is preferable to be configured so as to have a strength that can suppress the diameter expansion deformation. Thereby, it can suppress that the tubular body 200 leaves | separates from the sealing member 14 by diameter expansion deformation, and a fluid leak arises.
In the example shown in the drawing, the inner diameter of the second axial side second portion 152 of the outer cylinder member 15 is made smaller than the inner diameter of the extension portion 151 of the outer cylinder member 15 and the large diameter portion 175 of the main body member 17. It is smaller than the outer diameter.
On the outer peripheral surface of the extended portion 151 (outer cylinder portion) of the outer cylinder member 15, a stopper projection 151c configured with a protrusion extending in the circumferential direction is formed. In the illustrated example, the stopper projection 151 c of the outer cylinder member 15 is located on the first axial side with respect to the large-diameter portion 175 of the main body member 17. In the example of the figure, the stopper projection 151c extends over the entire circumference, that is, has an annular shape. Further, on the outer peripheral surface of the extending portion 151 (outer cylinder portion) of the outer cylinder member 15, a pair of fittings each formed of a protrusion extending in the circumferential direction on the first axial direction side from the stopper projection 151c. The protrusions 151a and 151b are formed at different axial positions. In the example of the drawing, the fitting protrusions 151a and 151b each extend over the entire circumference, that is, are configured in an annular shape.
The outer cylinder member 15 opens at the end on the first axial side of the outer cylinder member 15, extends to the second axial side, and terminates before reaching the second axial end of the outer cylinder member 15. A slit 153 is provided. The slit 153 will be described in detail later.

The cap 11 is made of, for example, resin, is configured in a cylindrical shape, and is provided on the outer peripheral side of the inner cylindrical portion 171 of the main body member 17. The axial second side portion 112 of the cap 11 is fitted into the outer peripheral surface of the portion of the extended portion 151 (outer cylindrical portion) of the outer cylinder member 15 on the first axial side from the stopper projection 151c by press-fitting. It is.
The end surface on the second axial side of the cap 11 abuts against the stopper projection 151c of the outer cylinder member 15, whereby the further movement toward the second axial direction is restricted.
A pair of fitting recesses 112a and 112b each formed of a groove extending in the circumferential direction are formed on the inner circumferential surface of the second axial side portion 112 of the cap 11 at different axial positions. In the example of the drawing, the fitting recesses 112a and 112b each extend over the entire circumference, that is, are configured in an annular shape. The fitting recesses 112a and 112b of the cap 11 are fitted with the fitting protrusions 151a and 151b of the outer cylinder member 15, respectively.
The axial direction first side portion 111 of the cap 11 is located on the axial direction first side with respect to the outer cylinder member 15.

  The lock claw 13 is made of, for example, metal and is formed in an annular shape, and has a shape bent in a substantially V shape that is convex on the first side in the axial direction. The lock claw 13 is disposed on the first axial side with respect to the outer cylinder member 15, on the inner peripheral side of the axial first side portion 111 of the cap 11 and on the outer peripheral side of the inner cylindrical portion 171 of the main body member 17. It is located on the outer peripheral side of the insertion space 16. In the lock claw 13, slits opened at the outer peripheral end of the lock claw 13 and slits opened at the inner peripheral end of the lock claw 13 are alternately provided in the circumferential direction. Thereby, the lock nail | claw 13 is comprised so that elastic deformation of a diameter expansion direction is possible. A plurality of claw portions 13 a that are spaced apart from each other in the circumferential direction by slits that open to the inner peripheral end of the lock claw 13 are formed at the inner peripheral end of the lock claw 13. The nail | claw part 13a is each extended toward the inner peripheral side and insertion direction ID. As shown in FIG. 1, in the state before the tubular body 200 is inserted into the insertion space 16, the inner diameter of the lock claw 13 is slightly smaller than the inner diameter of the outer cylinder portion 151 of the outer cylinder member 15, The tip of the claw portion 13 a protrudes into the insertion space 16.

  The release ring 12 is made of, for example, resin and is formed in a cylindrical shape. The release ring 12 is on the first axial side with respect to the lock claw 13, on the inner peripheral side of the axial first side portion 111 of the cap 11, and on the inner cylindrical portion 171 of the main body member 17. It is arrange | positioned at the outer peripheral side. The inner diameter of the release ring 12 substantially coincides with the inner diameter of the outer cylinder portion 151, and the inner peripheral surface of the release ring 12 defines a part of the insertion space 16.

When assembling the insertion connection port 30 during the manufacture of the pipe joint 1 configured as described above, after the outer cylinder member 15 is fitted into the outer peripheral surface of the main body member 17 by press-fitting, the cap 11 is attached to the outer cylinder member. 15 is press-fitted into the outer peripheral surface.
Here, the assembly of the main body member 17 of the sealing member 14 to the annular groove 171 a is performed, for example, before the outer cylinder member 15 is assembled to the main body member 17. The lock claw 13 and the release ring 12 can be assembled by, for example, storing the lock claw 13 and the release ring 12 on the inner peripheral side of the cap 11 before assembling the cap 11 to the outer cylinder member 15, and in this state, the cap 11 Is assembled to the outer cylinder member 15.
However, the insertion connection port 30 of the pipe joint 1 may be assembled in a different order.

In the pipe joint 1 manufactured as described above, as shown in FIG. 2, when the tubular body 200 is inserted into the insertion space 16, the claw portion 13 a of the lock claw 13 slightly bites into the outer peripheral surface of the tubular body 200. . At this time, the sealing member 14 fluid-tightly seals between the inner peripheral surface of the tubular body 200 and the outer peripheral surface of the inner cylinder portion 171 of the main body member 17. In this way, the tubular body 200 is connected to the insertion connection port 30 of the pipe joint 1 by one touch (just by inserting).
In this example, since the outer cylinder member 15 is made of a transparent material, a portion of the outer cylinder member 15 located in the axial direction region between the cap 11 and the large-diameter portion 175 of the main body member 17 is formed. The window portion 15a is configured so that it can be confirmed from the outside through the window portion 15a that the tubular body 200 has been inserted to the back of the insertion space 16 (end on the second axial side). .
In a state where the tubular body 200 is inserted into the insertion space 16, for example, when a force in the pulling direction PD is applied to the tubular body 200 during passage of water, the lock claw 13 has an outer peripheral surface of the tubular body 200 of the claw portion 13 a. The tubular body 200 is prevented from exiting the insertion space 16 by biting into the insertion space 16.
On the other hand, when removing the tubular body 200 from the pipe joint 1, first, a jig (not shown) is inserted into the cap 11 from the first axial side, and the release ring 12 is pushed into the second axial direction. Then, the release ring 12 presses the claw portion 13a of the lock claw 13 toward the second axial direction to release the claw portion 13a from biting into the outer peripheral surface of the tubular body 200. In this state, when the tubular body 200 is pulled out in the pulling direction PD, the tubular body 200 can be detached from the pipe joint 1.

Next, the slit 153 of the outer cylinder member 15 described above will be described in more detail with reference to FIGS. 3 and 4. FIG. 3A shows only a part of the pipe joint 1 of FIG. 1. Specifically, the main body member 17, the outer cylinder member 15, and the sealing member 14 are shown in an assembled state. Yes. FIG. 3B shows only the outer cylinder member 15 of FIG. In each of FIGS. 3A and 3B, the lower side of the drawing corresponds to the first axial side, and the upper side of the drawing corresponds to the second axial side.
As shown in FIG. 3, the slit 153 of the outer cylinder member 15 opens at the end on the first axial direction side of the outer cylinder member 15, extends to the second axial direction side, and is second in the axial direction of the outer cylinder member 15. Terminate before reaching the end of the side. The slit 153 penetrates the outer cylinder member 15 in the wall thickness direction (radial direction) of the outer cylinder member 15. Due to the presence of the slit 153, the outer cylinder member 15 can be reduced in diameter in the axial region corresponding to the slit 153 when a force in the reduced diameter direction is applied.
FIG. 4 is a view for explaining a state in which the cap 11 is fitted into the outer cylinder member 15 when the pipe joint 1 is manufactured. When the cap 11 is fitted into the outer cylinder member 15, for example, the main body member 17 and the outer cylinder assembled to the main body member 17 are assembled by an assembly device (not shown) in a state where the cap 11 is placed on a table (not shown). The member 15 is moved downward, and the outer cylinder member 15 is press-fitted into the inner peripheral side of the cap 11. In FIG. 4, one side (the left side in the figure) with respect to the tube axis O is in a state before the outer cylinder member 15 enters the inner peripheral side of the cap 11, and the other side with respect to the tube axis O. (The right side of the figure) shows the state when the outer cylinder member 15 starts to enter the inner peripheral side of the cap 11.
If the outer cylinder member 15 does not have the slit 153, when the cap 11 is press-fitted into the outer cylinder member 15, the outer cylinder member 15 cannot be deformed in a reduced diameter. A force is applied to the cap 11. At this time, the cap 11 may be cracked. At this time, the concave and convex shapes of the fitting portions (the fitting protrusions 151a and 151b and the fitting recesses 112a and 112b) between the inner peripheral surface of the cap 11 and the outer peripheral surface of the outer cylinder member 15 are crushed (for example, pin angle ). When the concave-convex shape of the fitting portion between the cap 11 and the outer cylinder member 15 is crushed, when the force in the drawing direction PD acts on the tubular body 200 once inserted into the insertion space 16, the cap 11 is 15, the tubular body 200 cannot be held in the insertion space 16, and the tubular body 200 may come out. In order to suppress these problems, the material of the cap 11 is selected so that the cap 11 can be expanded and deformed to such an extent that the cap 11 can be sufficiently expanded and deformed, and has a sufficiently high strength. There is a need to. For this reason, the selection range of the 11 materials of the cap is narrow, which may lead to an increase in cost.
However, according to the present embodiment, since the outer cylinder member 15 has the slit 153, when the cap 11 is press-fitted into the outer cylinder member 15, the outer cylinder member 15 is contracted as shown on the right side of FIG. Can be deformed in diameter. Thereby, the force in the diameter expansion direction that the cap 11 receives from the outer cylinder member 15 can be greatly reduced, and the necessity for the cap 11 to expand and deform can be largely eliminated. For this reason, when the cap is fitted into the outer cylinder member, the cap 11 is cracked or the fitting portion between the cap 11 and the outer cylinder member 15 (the fitting protrusions 151a and 151b and the fitting recesses 112a and 112b). Crushing of the uneven shape can be suppressed. In addition, since a material that cannot be stretched and deformed can be selected as the material of the cap 11, the selection range of the material of the cap 11 can be widened, and the above-described problems can be solved regardless of the material of the cap 11. Can be suppressed. This also leads to cost reduction. Moreover, since the load required for press-fitting the cap 11 into the outer cylinder member 15 can also be reduced, productivity can be improved.

  In addition, as shown in FIG. 1, the pipe joint 1 of the present embodiment has a case where there is no slit 153 because the outer cylinder member 15 has the slit 153 when the tubular body 200 is not inserted into the insertion space 16. In contrast, when the cap 11 is pulled with respect to the outer cylinder member 15 in the drawing direction PD, the cap 11 may be easily detached due to the diameter-reducing deformation of the outer cylinder member 15. However, as shown in FIG. 2, in a state where the tubular body 200 is inserted into the insertion space 16, the tubular body 200 prevents deformation of the outer cylinder member 15 from being reduced in diameter. In addition, it is possible to prevent the cap 11 from being detached from the outer cylinder member 15. As a result, the lock claw 13 can be reliably held by the cap 11, and the retaining function of the tubular body 200 by the lock claw 13 can be maintained. Therefore, the function as a pipe joint can be maintained.

Here, as shown in FIG. 3A, in the plan view of the slit 153, the maximum value MSW of the slit width of the slit 153 when measured along the axial direction is 16 insertion spaces of the main body member 17. Is preferably smaller than the outer diameter D of the inner cylindrical portion 171 (ie, MSW <D). In this specification, the slit width of the slit 153 refers to the width of the slit 153 as measured along the axial direction in the plan view of the slit 153.
If the maximum value MSW of the slit width of the slit 153 is equal to or larger than the outer diameter D of the inner cylindrical portion 171, the tubular body 200 to be inserted into the insertion space 16 has a high temperature and / or high pressure fluid in the tubular body 200. There is a possibility that the diameter expansion deformation of the tubular body 200 cannot be sufficiently suppressed when the diameter expansion deformation is attempted during the flow. By making the maximum value MSW of the slit width of the slit 153 smaller than the outer diameter D of the inner cylindrical portion 171, the expansion expansion deformation of the tubular body 200 can be sufficiently suppressed, and as a result, the tubular body 200 is sealed by the expansion expansion deformation. It is possible to suppress the occurrence of fluid leakage away from the stop member 14 (that is, the water stop performance can be improved).
From the same viewpoint, it is more preferable that the maximum value MSW of the slit width of the slit 153 is 2/3 times or less the outer diameter D of the inner cylindrical portion 171 (that is, MSW ≦ 2 / 3D).

  In the example of FIG. 3, the slit width of the slit 153 of the outer cylinder member 15 is constant over substantially the entire length of the slit 153 in the axial direction. However, the slit width of the slit 153 may change along the axial direction.

FIG. 5 is a view for explaining a pipe joint 1 according to a first modified example of the present invention. FIGS. 5 (a) and 5 (b) are FIGS. 3 (a) and 3 (b), respectively. Corresponding to The first modified example of FIG. 5 differs from the example of FIG. 3 only in the shape of the slit 153.
In the example of FIG. 5, the slit 153 opens at an end on the first axial direction side of the outer cylinder member 15 and extends to the second axial direction side, and has a narrow slit 153 a and a slit larger than the narrow slit 153 a. A wide slit portion 153b having a width and extending from an end on the second axial direction side of the narrow slit portion 153a to the second axial direction side.
First, according to the slit 153 of the present example, when the cap 11 is fitted into the outer cylinder member 15, the outer cylinder member 15 can be effectively reduced in diameter as in the case of the slit 153 of the example of FIG. 3.
Furthermore, according to this example, the narrow slit portion 153a having a relatively narrow slit width is disposed on the first axial direction side (that is, the opening side of the slit 153), so that the outer cylinder member is compared with the example of FIG. 15, the diameter expansion deformation of the tubular body 200 inserted into the insertion space 16 can be reliably suppressed. Further, by disposing the wide slit portion 153b having a relatively wide slit width on the second axial side (that is, the terminal end side of the slit 153), the tubular body 200 is expanded by the outer tubular member 15 as compared with the example of FIG. The amount of the material constituting the outer cylinder member 15 can be reduced without lowering the function of suppressing the radial deformation, and hence the cost can be reduced.

As in the example shown in FIG. 5, the narrow slit portion 153 a is at an axial position overlapping at least one of the sealing members 14, in other words, the radial direction of at least one of the sealing members 14 It is preferable that it is located outside.
Thereby, the intensity | strength of the outer cylinder member 15 can be improved at least in the axial direction position of the sealing member 14, and the diameter expansion deformation of the tubular body 200 inserted into the insertion space 16 can be more effectively suppressed. Thereby, it can suppress reliably that the tubular body 200 leaves | separates from the sealing member 14, and a fluid leak arises (namely, water stop can be improved). Further, by disposing the wide slit portion 153b having a relatively wide slit width on the second axial side (that is, the terminal end side of the slit 153), the amount of material constituting the outer cylinder member 15 can be reduced, and the cost can be reduced. Is possible.

In the first modified example of FIG. 5, the narrow slit portion 153 a and the wide slit portion 153 b extend substantially linearly along the axial direction with a substantially constant slit width in the plan view of the slit 153. Yes.
However, the present invention is not limited to this, and each of the narrow slit portion 153a and the wide slit portion 153b may have a slit width that changes along the axial direction, or may be formed in a shape different from the linear shape. Good.

FIG. 6 is a view for explaining a pipe joint 1 according to a second modification of the present invention, and FIGS. 6 (a) and 6 (b) are FIGS. 4 (a) and 4 (b), respectively. Corresponding to
The second modified example in FIG. 6 differs from the example in FIG. 5 only in the shape of the wide slit portion 153b of the slit 153, and the shape of the narrow slit portion 153a of the slit 153 and the portion other than the slit 153. The configuration is the same as in the example of FIG.
In the second modification of FIG. 6, the wide slit portion 153 b has a circular shape in the plan view of the slit 153.
Thereby, in addition to the effect of the example of FIG. 5, when the cap is fitted into the outer cylinder member, the outer cylinder member 15 can be further reduced in diameter, and as a result, the cap 11 is cracked or the cap 11 is deformed. Crushing of the concave and convex shape at the fitting portion between the outer cylinder member 15 and the outer cylinder member 15 can be more effectively suppressed.

In the examples of FIGS. 3, 5, and 6, the number of slits 153 formed in the outer cylinder member 15 is two, and these slits 153 are equally spaced in the circumferential direction, that is, face each other. To be arranged.
However, the present invention is not limited to this, and the number of slits 153 formed in the outer cylinder member 15 can be appropriately changed depending on the material of the outer cylinder member 15 and the material of the cap 11. When the number of the slits 153 is too large, there is a possibility that the strength necessary for suppressing the diameter expansion deformation of the tubular body 200 cannot be secured. Further, when the number of the slits 153 is small, the outer cylinder member 15 is less likely to be reduced in diameter when the cap 11 is fitted into the outer cylinder member 15. From such a viewpoint, for example, 1 to 8 slits 153 are preferable, and 2 to 4 slits are more preferable.
In addition, when a plurality of slits 153 are formed in the outer cylinder member 15, it is preferable that these slits 153 are arranged at equal intervals in the circumferential direction, because it is possible to suppress a bias in strength of the outer cylinder member 15. It is.
FIG. 7 is a view for explaining a pipe joint 1 according to a third modification of the present invention, and corresponds to FIG. The example of FIG. 7 differs from the example of FIG. 3 only in that the number of slits 153 formed in the outer cylinder member 15 is four. According to the example of FIG. 7, compared to the example of FIG. 3, when the cap 11 is fitted into the outer cylinder member 15, the outer cylinder member 15 is easily deformed in a reduced diameter.

FIG. 8 is a view for explaining a pipe joint 1 according to a fourth modification of the present invention, in which a fitting portion between the outer cylinder member 15 and the cap 11 of the pipe joint 1 is enlarged and axially extended. It is shown by a cross section along.
In the example shown in FIG. 1, end surfaces (151ae, 151be) that are configured to be in contact with each other and are located on the second axial side of the fitting protrusions 151a, 151b of the outer cylinder member 15 and face the second axial direction. ) And end faces (112ae, 112be) which are located on the second axial side of the fitting recesses 112a, 112b of the cap 11 and face the first axial direction are parallel to the axial direction.
On the other hand, in the example of FIG. 8, end surfaces 151 ae and 151 be that are configured to be in contact with each other and are located on the second axial side of the fitting protrusions 151 a and 151 b of the outer cylinder member 15 and face the second axial direction. And the end faces 112ae and 112be that are located on the second axial side of the fitting recesses 112a and 112b of the cap 11 and that face the first axial direction are axially straight so that they face the outer peripheral side and the first axial direction. Inclined with respect to direction. End surfaces 151ae and 151be located on the second axial side of the fitting projections 151a and 151b of the outer cylinder member 15 and facing the second axial direction, and the second axial side of the fitting recesses 112a and 112b of the cap 11 And the end surfaces 112ae and 112be facing the first axial direction are preferably inclined angles θ on the acute angle side with respect to the axial straight direction, for example, 1 to 10 °, and 1 to 5 °. And more preferred.
As a result, when a force in the pulling direction PD is applied to the tubular body 200, for example, when water is passed, the cap 11 slightly moves in the pulling direction PD. As a result, the outer cylinder member 15 slightly changes due to the presence of the slit 153. The diameter of the sealing member 14 is further reduced and the sealing member 14 is further compressed and deformed. As a result, the tubular body 200 and the main body member 17 are further brought into close contact with each other, so that fluid leakage can be more effectively suppressed (that is, the water stopping effect is further improved). Can be improved.)

In each example described above, if the length of the slit 153 in the axial direction is too short, the outer cylinder member 15 cannot be sufficiently reduced in diameter when the cap is fitted into the outer cylinder member. From this viewpoint, the length SL in the axial direction of the slit 153 is preferably 1/3 or more of the total length of the outer cylinder member 15 in the axial direction, and is ½ or more of the total length of the outer cylinder member 15 in the axial direction. Is more preferable.
From the same viewpoint, as in the example of FIGS. 3, 5, and 6, the slit 153 extends further to the second axial side than the sealing member 14 located closest to the second axial direction. Is preferred.
In the example of FIGS. 3, 5, and 6, the slit 153 terminates on the first axial side of the stopper projection 151 c of the outer cylinder member 15. In this case, since the slit 153 is covered with the cap 11 and cannot be seen from the outside, the appearance of the pipe joint 1 can be improved. However, the slit 153 may extend further to the second axial side than the stopper projection 151c of the outer cylinder member 15. In this case, the cap 11 is secured to the outer cylinder member 15 while ensuring sufficient strength. The outer cylinder member 15 can be further reduced in diameter when being fitted into the cylinder member 15.

In each example described above, if the slit width of the slit 153 is too narrow, the outer cylinder member 15 cannot be deformed in a reduced diameter when the cap is fitted into the outer cylinder member. From this viewpoint, the minimum value of the slit width in the portion excluding the end portion (terminal portion) on the second axial side of the slit 153 is preferably 1.5 mm or more, and more preferably 2 mm or more.
From the same viewpoint, in the example of FIGS. 5 and 6, the slit width NSW of the narrow slit portion 153a of the slit 153 is preferably 1.5 mm or more, and more preferably 2 mm or more.
3, 5, and 6, the slit width at the first axial end (opening end) of the slit 153 is the width of the outer cylinder member 15 in the axial region corresponding to the slit 153. It is smaller than the maximum value MT of the radial thickness. In this case, when assembling the pipe joint 1, when a large number of outer cylinder members 15 are gathered and arranged in one place, there is a problem that one outer cylinder member 15 fits into the slit 153 of the other outer cylinder member 15. Since it can prevent, manufacturability can be improved.

  The pipe joint by this invention can be utilized for piping for arbitrary fluids, such as cold water, warm water, oil, gas, for example.

  1: pipe joint, 11: cap, 111: axial first side portion of cap, 112: axial second side portion of cap, 112a, 112b: fitting recess, 112ae, 112be: axial direction of fitting recess 2 side end face, 12: release ring, 13: lock claw, 13a: claw part, 14: sealing member, 15: outer cylinder member, 15a: window part, 151: extension part of outer cylinder member (outer cylinder part) 151a, 151b: fitting protrusions, 151ae, 151be: end face on the second axial side of the fitting protrusion, 151c: stopper protrusion, 152: second axial part of the outer cylinder member, 153: slit 153a: narrow slit portion, 153b: wide slit portion, 16: insertion space, 17: main body member, 171: first axial side portion (inner cylinder portion) of the main body member, 171a: Annular groove, 172: Second axial portion of main body member, 172a: Screw portion, 173: Torque input portion of main body member, 174: Small diameter portion of main body member, 175: Large diameter portion of main body member, 176: Main body member 30: Insertion connection port, 200: Tubular body, MSW: Maximum slit width, NSW: Slit width of the narrow slit portion, MT: Outer cylinder member in the axial region corresponding to the slit Maximum value of wall thickness, O: Pipe axis of pipe joint

Claims (4)

A cylindrical main body member that divides a pipeline by an inner peripheral surface;
An outer cylinder member, which is disposed on the outer peripheral side of the main body member and defines an insertion space for inserting the tubular body from the first axial direction side with the main body member;
A cap fitted into the outer peripheral surface of the outer cylinder member;
A pipe joint comprising:
The outer cylinder member opens to the end on the first axial direction side of the outer cylinder member, extends to the second axial direction side, and terminates before reaching the second axial end of the outer cylinder member A pipe joint having a slit. The slit is
A narrow slit that opens at an end on the first axial side of the outer cylinder member and extends to the second axial side;
A wide slit portion that has a larger slit width than the narrow slit portion and extends from an end on the second axial side of the narrow slit portion to the second axial side;
The pipe joint according to claim 1, comprising: Arranged in an annular groove formed on the outer peripheral surface of the main body member, and in a state where the tubular body is inserted into the insertion space, a fluid-tight seal is provided between the main body member and the tubular body; A sealing member,
The said narrow slit part is a pipe joint of Claim 2 which exists in the axial direction position which overlaps with the said sealing member.   The pipe joint according to claim 2 or 3, wherein the wide slit portion has a circular shape in a plan view of the slit.

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