JPH11182755A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a looseness preventive effect of a fastening nut by interposing an elastic ring diametrically contracting by the fastening nut by locking one end of the free end of a male screw cylinder, between a core cylinder and the fastening nut threadedly engaged with the male screw cylinder, and arranging a receiving groove on the other end side peripheral side of this elastic ring. SOLUTION: A core cylinder 5 around which the tail end of a connecting object pipe 4 is fitted and the male screw part 3 threadedly engaged with a fastening nut 7, are extended in a concentric shape to one end side of a joint main body 1. The fastening nut 7 is thread-mounted on the male screw part 3 when a display pin 10 is out in a set state visually confirmable through a window hole 12 by pressing the display pin 10 against an elastic material 11 by the tail end of the connecting object pipe 4 by fitting/inserting the connecting object pipe 4 to/into this core cylinder 5. At this time, looseness of the nut 7 is prevented by engaging the fastening nut 7 and a projecting strip 16 with a receiving groove 17 while sandwiching the connecting object pipe 4 by diametrically contracting an elastic ring 13 in a state of engaging a projecting piece 18 of the elastic ring 13 interposed between the core cylinder 5 and the fastening nut 7 with a cutout 19 of a main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for connecting a copper pipe, a stainless steel pipe, a polyethylene pipe or the like constituting a fluid pipe to equipment.

[0002]

2. Description of the Related Art A first male screw to be screwed to a device at one end and a second male screw to a second main screw of a joint body provided with a second male screw and an insertion tube portion to be inserted into a connected pipe at the other end. The present inventor has already proposed a pipe joint in which a holding ring is interposed between the fitting nut and the fitting nut, and the holding ring is reduced in diameter to hold the connected pipe in which the insertion tube portion is inserted. (Japanese Patent Application No. Hei 8-96467).

[0003]

In the above prior art, the diameter of the press ring is reduced by screwing a tightening nut to the second male screw of the joint body, and the connected pipe is formed by the press ring and the insertion tube. In this case, the clamping nut is loosened, and the clamping state cannot be maintained. As a result, fluid leakage may occur.

The present invention has been made by focusing on the above-mentioned drawbacks of the conventional example.

[0005]

At the other end of the joint body, one end of which is attached to a device, a male screw tube and a core tube inserted inside the connected tube inside the male screw tube are provided. An elastic ring whose one end is locked to the free end of the male screw cylinder and whose diameter is reduced by the tightening nut is interposed between the tightening nut and one end screwed to the male screw cylinder. A receiving groove is provided on the peripheral side on one end side of the nut, and a ridge engaging with the receiving groove is provided on the inner peripheral surface of the other end of the tightening nut.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a pipe joint according to the present invention. FIG. 1 is a sectional view showing a state where connected pipes are combined, and FIG. 2 is a sectional view showing a state where a tightening nut is tightened.

In the figure, reference numeral 1 denotes a male screw 2 provided at one end with a male screw 2 to be screwed into a device a, and a male screw cylinder 3 at the other end and a core cylinder inserted into the connected cylinder 4 inside the male screw cylinder 3. The joint body 1 is provided with a square cylindrical tool engaging portion 6 at an intermediate portion adjacent to the male screw 2 and operates a tool engaged with the tool engaging portion 6. By doing so, the male screw 2 is screwed into a screw hole provided in the device a and assembled with the device a.

The male screw cylinder 3 has a tightening nut 7 on its outer peripheral surface.
A screw 3a for screwing one end of the inner wall of the male screw cylinder 3 and the core cylinder 5 having a free end protruding from the male screw cylinder 3. A plurality of (three in this embodiment) concentrically arranged along the axis of the joint body 1 on the inner wall 8 ′ of the engagement gap 8. Of receiving holes 9, 9, 9 of
A display pin 10 is slidably fitted in the receiving hole 9 so as to be able to come and go, and an elastic material (in the embodiment, a coil spring is used, but rubber or a resin piece may be used) between the display pin 10 and the inner end of the receiving hole 9. 11), the display pin 10 is urged in a direction protruding from the receiving hole 9.

A window hole 12 is formed on the peripheral side of the receiving hole 9, that is, on the peripheral side between the male screw cylinder 3 and the tool engaging portion 6 of the joint body 1. The state of the display pin 10 protruding (moving) with respect to the receiving hole 9 can be visually checked.

When the display pin 10 of the embodiment protrudes from the receiving hole 9 by the bias of the elastic member 11 (ie,
When not pressed at the end of the connected pipe 4), there is no colored display portion 10a at the position of the window hole 12, and when immersed (when pressed by the connected pipe 4), the window 1
The display unit 10a exists at two positions.

FIG. 13 shows an elastic ring (made of brass, phosphor bronze or stainless steel) whose one end is locked to the free end of the male screw cylinder 3 and whose diameter is reduced by the tightening nut 7. An inclined slit 14 provided so as to cross the axis (the axis of the joint body 1)
Is provided, and a bulging edge 15 is provided at an intermediate portion in the axial direction to be in contact with the pressing surface 7 'of the tightening nut 7 (the outer diameter of the bulging edge 14 is larger than the inner diameter of the pressing surface 7'. On the other end side adjacent to the bulging edge 15, a receiving groove 17 is provided for fitting and locking a ridge 16 provided on the inner peripheral surface of the other end of the tightening nut 7. It is.

A projecting piece 18 is provided at one end of the elastic ring 13 on the joint body 1 side, and when the connected pipe 4 is connected, the projecting piece 18 is provided.
Is provided at the other end of the joint body 1 (the free end of the male screw cylinder 3), and a protruding edge 20 is provided on the inner peripheral surface of the elastic ring 13. This ridge 2
Reference numeral 0 denotes a concave receiving groove 21 formed on the outer peripheral surface of the core tube 5 via the connected pipe 4.

The tightening nut 7 has a female screw 7a which is screwed to the screw 3a of the male screw cylinder 3 on the inner peripheral surface at one end, and the clamping surface 7 'at the other end is connected to the screw 3a. The diameter is reduced, and the ridge 16 is provided at the end of the clamping surface 7 ′, that is, at the inner peripheral surface of the other end of the tightening nut 7.

Then, the female screw 2 at one end is screwed into a screw hole provided in the device a, and the joint body 1 is attached to the device a.
When the terminal of the connected pipe 4 is assembled to the joint body 1 by inserting the core tube 5 into the inside thereof and pressed against the back wall 8 ′ of the engagement gap 8, the terminal of the connected pipe 4 is displayed. Pin 10
Is pressed against the urging of the elastic member 11, the display pin 10 retreats toward the far end of the receiving hole 9, and the display pin 10 protrudes / retreats through the window hole 12, that is, the connection pipe 4 with respect to the joint body 1. The set state (whether or not it is in the correct position) can be determined.

The projecting piece 18 of the elastic ring 13 is engaged with the notch 19 of the elastic ring 13 and the tightening nut 7 assembled so that the connected pipe 4 is inserted through the connected pipe 4. When the combination of the joint body 1 and the tightening nut 7 are moved to a position surrounding the core tube 5 and screwed into the female screw 7a with the screw 3a of the male screw tube 3, one end of the elastic ring 13 becomes a male screw. While being locked to the free end of the cylinder 3, the diameter is reduced by the pressing surface 7 ′ of the tightening nut 7, and the diameter is reduced.
0 and the receiving groove 21 are arranged at positions opposing each other, and the connection pipe 3 is held by the elastic ring 13 and the core tube 5 in the positional relationship with the most excellent sealing property, and is connected to the device a via the joint A of the embodiment. When the fastening nut 7 is mounted and the tightening operation of the fastening nut 7 is completed, the protrusion 16 of the fastening nut 7
To prevent the tightening nut 7 from loosening. Also,
At this time, one end of the elastic ring 13 on the receiving groove 17 side is
As shown by, the end of the tightening operation can be visually recognized because it protrudes from the tightening nut 7.

During the screwing of the tightening nut 7,
The elastic ring 13 is provided on the fastening nut 7
Is locked relatively to the circumferential direction by being locked in the notch 19, so that it does not rotate together with the tightening nut 6, and the screwing tightening operation is reliably performed, and A torsion of the connected pipe is prevented, and damage to the connected pipe due to the torsion is prevented.

Further, the loosening of the tightening nut 7 is more reliably prevented by the engagement relationship between the projecting piece 18 and the notch 19 (the receiving groove 17 of the elastic ring 13 which does not rotate together).
The pressing condition of the elastic ring 13 against the tightening nut 7 and the connection pipe 4 restricts the movement in the direction along the axis thereof.
Even if it is attempted to loosen, the engagement relationship between the receiving groove 17 and the ridge 16 restricts the loosening (rotation in the loosening direction) of the tightening nut 7, so that the engagement relationship between the projection 18 and the notch 19 is not necessarily required. .

The tapered surface 7b between the female screw 7a of the tightening nut 7 and the pressing surface 7 'is used to make the relative movement of the elastic ring 13 in the direction of the pressing surface 7' smooth. It is.

The joint body 1, the tightening nut 7 and the elastic ring 13 are made of brass, but may be made of another metal, for example, stainless steel.

[0020]

The present invention has the configuration described above,
The elastic ring is reduced in diameter by the tightening nut, and the connected pipe is clamped between the elastic ring and the core tube to provide a product suitable as a joint for mounting the connected pipe to the device.

Further, since the protrusion on the tightening nut side is engaged with the receiving groove provided in the elastic ring, the shaft moves in the axial direction by the external force in the index direction applied to the connected pipe unless human power is applied. Since the possible elastic ring and the tightening nut movable in the rotation direction (screw rotation direction) are engaged with each other, the tightening nut is not easily loosened synergistically, and a stable connection state of the connected pipe can be obtained. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state where connected pipes are combined.

FIG. 2 is a sectional view showing a state in which a tightening nut is tightened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 3 Male screw cylinder 4 Connected pipe 5 Core cylinder 7 Tightening nut 16 Protrusion 17 Receiving groove

Claims (1)

[Claims] 1. A male screw cylinder and a core cylinder inserted inside a connected pipe inside the male screw cylinder are provided at the other end of the joint main body having one end attached to a device, and the core cylinder and the male screw cylinder are provided. An elastic ring whose one end is locked to the free end of the male screw cylinder and whose diameter is reduced by the tightening nut is interposed between the tightening nut and one end of the elastic ring. A pipe joint, wherein a receiving groove is provided on a peripheral side, and a ridge engaging with the receiving groove is provided on an inner peripheral surface of another end of the tightening nut.