JPH0315905Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a tube connection joint for connecting a flexible tube made of polyethylene, nylon, etc., to a pipe line of a hot water supply facility, etc. Regarding the improvement of

[Conventional technology]

Tube connection fittings for connecting tubes that make up a conduit must be firmly held in the fitting body so that they do not damage the connected flexible tubes and do not slip out, and must be designed to prevent leakage. It is required to be kept watertight to prevent this from occurring.

For this reason, conventional joints for connecting tubes usually include a joint body 1 and a metal fitting that is inserted into the inside of the tube a to be connected and receives the tube a from the inside, as shown in FIGS. 1 and 2. a metal chuck sleeve 3 that is fitted onto the outer periphery of the tube a to bind the tube a;
It is composed of four parts: the end of the tube a, the sleeve 2 and the chuck sleeve 3, and a cap nut 4 which is screwed into the joint body 1, and these parts are set as shown in Fig. 2. Then, by tightening the cap nut 4, both axial ends 30, 30 of the chuck sleeve 3 are tightened as shown in FIG.
is caulked to the outer circumferential surface of the tube a with the sleeve 2 fitted inside, and the chuck sleeve 3, the inner sleeve 2, and the tube a are tightly held together, and the outer circumferential surface of the tube a and the tube a are crimped together. Watertightness is maintained at the crimped portions of the chuck sleeve 3 with both ends 30, 30 which are crimped.

[The problem that the idea attempts to solve]

By the way, in this conventional means, both ends 30, 30 of the chuck sleeve 3 are tightened by tightening the cap nut 4.
is clamped between the tapered part w on the inner end side of the inner peripheral surface of the cap nut 4 and the end face y on the front end side of the joint body 1, and the both ends 30 are moved from the state shown in FIG. 4 to the state shown in FIG. Since the cap nut 4 is bent and deformed in the state shown in FIG. During strong tightening, both ends 30 of the chuck sleeve 3 are bent and caulked toward the outer peripheral surface of the tube a due to slight over tightening.
Since the leading edge of the cap nut 30 bites into the tube a and is sheared, there is a problem in that it is difficult to tighten the cap nut 4.

Further, in order to ensure that the tube a is tightly bound by the chuck sleeve 3 and the sleeve 2, the outer diameter D1 of the sleeve 2 is made somewhat larger than the inner diameter D2 of the tube a, and the chuck sleeve 3 is Since its inner diameter D3 is the same as or slightly smaller than the outer diameter D4 of tube a, sleeve 2, chuck sleeve 3, and cap nut 4 are attached to the inside and outside of the terminal end of tube a to be connected. If the sleeve 2 is inserted first when inserting the chuck, the tube a will be pushed outward in the radial direction and its outer diameter will become larger, making it impossible to insert the chuck sleeve 3. There is the trouble of having to ensure that the assembly procedures for each part do not change in the same way.

Furthermore, if the cap nut 4, the chuck sleeve 3, and each part of the sleeve 2 are set in advance at the connecting end of the tube a, the outer diameter of the tube a increases due to the insertion of the sleeve 2 described above, and the tube The sleeve 3 cannot be moved by hand relative to the tube a, and it becomes difficult to adjust the insertion depth when inserting the connecting end of the tube a into the inner cavity on the distal end side of the joint body 1. When connecting by tightening the cap nut 4, an incomplete connection may occur, so please be sure to
Each part of the dot and tube a are handled separately. Therefore, when these are set and the tube a is connected, there is a problem that parts may be lost or the above-mentioned assembly procedure may be erroneously performed, making the connection work cumbersome.

Furthermore, in order to ensure watertightness, an O-ring made of elastic material is used in combination. Sometimes, the O-ring does not fit well, making it even more difficult to insert the tube into the temporarily bound position.

The present invention was developed to solve these problems, and allows for easy tightening of cap nuts without the need for large torques, as well as for maintaining watertightness and tightening without damaging the tube. Once the tube is in a secure state, the tube can be connected, but inserting the tube into it after all parts have been assembled and temporarily secured using O-rings may cause deformation or damage to the tube. To provide a new means for easily connecting tubes by making it possible to do so without any trouble, and for ensuring watertightness even if the tubes are deformed due to thermal changes during use. The purpose is to

[Means to solve the problem]

In the present invention, as a means to achieve this purpose, the metal material is made of a metal material having a connecting cylinder part for inserting a tube, the outer peripheral surface of which is formed with a threaded part for screwing in a cap nut. A joint body, an O-ring made of an elastic material that is fitted onto the outer periphery of the connecting end of the tube, a chuck sleeve made of a metal material, and a guide sleeve made of a metal material that is fitted onto the inner periphery of the connecting end of the tube. , a cap nut that is screwed into the threaded portion of the connecting cylinder portion of the joint body, and the inner circumferential surface of the connecting cylinder portion of the joint body has an inner diameter corresponding to the outer diameter of the O-ring on the distal end side. a diameter-enlarging step portion is formed, and a diameter-reducing step portion is formed on the proximal end side of the diameter-enlarging step portion, and the diameter-reducing step portion is reduced in diameter to an inner diameter corresponding to the outer diameter of the tube; A guide is formed between the diameter-enlarging stage and the sloping stage whose diameter gradually decreases toward the diameter-reducing stage, and can be inserted into the proximal end of the diameter-reducing stage on the inner circumferential side of the connection end of the tube. The chuck sleeve is provided with an abutment step portion for receiving the proximal end face of the sleeve, the chuck sleeve is provided with an end face facing the side face of the O-ring on the proximal end thereof, and the guide sleeve is provided with an abutment step portion that receives the proximal end face of the sleeve. The present invention proposes a joint for connecting a tube, in which a slotted groove extending over the entire length in the axial direction is formed in the circumferential wall of the body.

〔Example〕

Next, embodiments will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings as in the previous means are used for constituent members having the same effect.

FIG. 6 is a longitudinal sectional side view of a joint A for connecting tubes in which the present invention can be implemented, with the tubes connected.
In the figure, 1 is the joint body, a is the tube, 5 is an O-ring that can be inserted into the outer periphery of tube a, 3 is a chuck sleeve that can be inserted into the outer periphery of tube a, and 6 is a guide that is inserted into the inner periphery of tube a. sleeve,
4 indicates a cap nut screwed onto the joint body 1.

As shown in FIGS. 7 and 8, the joint body 1 is formed by cutting a metal material such as gunmetal to form a bag on the outer circumferential surface of the hexagonal nut-shaped main body 1a (right end side in FIG. 7). Threaded part 1 into which nut 4 is screwed
0, and the inner peripheral surface of the connecting cylinder part 1b has a diameter corresponding to the outer diameter of the O-ring 5 on the tip side. A diameter-enlarging step 13 having an inner diameter is formed, and a diameter-reducing step 14 having an inner diameter reduced to an outer diameter corresponding to the outer diameter of the tube a is formed on the proximal side of the diameter-enlarging step 13. An inclined step portion 12 is formed between the diameter-reducing step portion 14 and the diameter-enlarging step portion 13, and the diameter thereof gradually decreases toward the diameter-reducing step portion 14. , an abutting stepped portion 11 is formed which is fitted into the inner peripheral side of the connecting end of the tube a and receives the proximal end surface 60 of the guide sleeve 6 which is inserted into the connecting cylinder portion 1b together with the tube a. be.

Tube a is made of reinforced polyethylene, nylon,
It is a normal flexible tube made of synthetic resin material such as plybdenum.

The O-ring 5 is a normal one used for maintaining watertightness and is made of an elastic material such as rubber, and its inner diameter is larger than the outer diameter of the tube a so that it can be tightly fitted onto the outer peripheral surface of the tube a. It is set to a slightly smaller diameter.

The chuck sleeve 3 is made of the same metal material as the material forming the joint body 1, and has an inner diameter similar to that of the tube a.
The outer diameter of the sleeve is the same as or slightly larger than the outer diameter of the sleeve. Then, on the proximal end side (the left end side in FIG. 7), the outer diameter dimension is
A flange 31 corresponding to the inner diameter of the O-ring 5 is formed, thereby forming a wide end surface 32 on the proximal side that comes into contact with the side surface of the O-ring 5, and on the distal side,
By forming a cone-shaped bulge 33 whose outer diameter corresponds to the inner diameter of the enlarged diameter portion 13, and forming a plurality of slotted grooves 34 equally distributed in the circumferential direction, A chuck portion 3a is formed which reduces in diameter when the cap nut 4 is tightened. This chuck portion 3a is
The slotted grooves 34 may be omitted.

The guide sleeve 6 is made of an elastic metal material such as steel and has an outer diameter corresponding to the inner diameter of the tube a. A flange 6a whose outer diameter corresponds to the outer diameter of the tube a is formed on the end side to be wide. A book slot 6b is formed over the entire length in the axial direction.

The cap nut 4 is a normal one cut from the same metal material as the joint body 1, and the base end side of the inner peripheral surface (the left end side in FIG. 7) has the connecting cylinder portion 1b of the joint body 1. Threaded portion 4 that screws into the threaded portion 10 on the outer periphery
0 is formed. In addition, on the tip side of the inner peripheral surface,
A tapered portion 41 is formed to correspond to the outer peripheral surface of the cone-shaped chuck portion 3a of the aforementioned chuck sleeve 3, and the tip side thereof is formed to correspond to the outer peripheral surface of the cone-shaped chuck portion 3a.
It is formed in an opening 42 corresponding to the outer diameter dimension of.

[Effect]

The embodiment device constructed in this manner operates as follows.

The joint body 1, the O-ring 5, the guide sleeve 6, the chuck sleeve 3, and the cap nut 4 must be connected when storing them or handling them when transporting them to the construction site. At the connecting end of tube a, as shown in Fig. 9, an O-ring 5, a chuck sleeve 3, and a cap nut 4 are fitted on the outer circumferential side, and a guide sleeve 6 is fitted on the inner circumferential side. In this state, as shown in FIG. 10, insert the cap nut 4, which has been previously fitted into the tube a, into the connecting cylinder part 1b of the joint body 1 by the guide of the guide sleeve 6. As shown in FIG. 11, lightly screw them together and temporarily secure them, leaving them set with the tube a to be connected.

Next, when connecting the tube a at the construction site, select the tube a with the guide sleeve 6 inserted into the inner circumferential side from the parts temporarily bound in the state shown in FIG. 6. When pulled out, the state shown in FIG. 12 is obtained in which only the parts except the tube a and the guide sleeve 6 are temporarily bound. Then, in the state shown in FIG. 12, the joint body 1 is connected to a predetermined pipe line.

Next, in this state, attach the connecting end of the tube a that has been pulled out, with the guide sleeve 6 still inserted into the inner circumferential side of the connecting end, and tighten the cap nut 4.
into the opening 42 on the tip side of the tube a.
The proximal end surface 60 of the guide sleeve 6, which is fitted into the connecting end of the joint body 1, is pushed in until it abuts against the abutment step 11 provided on the inner circumferential surface of the connecting cylinder part 1b of the joint body 1.

At this time, the O-ring 5 of the parts that have been temporarily stapled and assembled is located within the enlarged diameter stepped portion 13 provided on the inner circumferential surface of the connecting cylinder portion 1b of the joint body 1, and Since the axis is aligned with the axis of the joint body 1 and is not subject to the pushing pressure of the chuck sleeve 3 due to tightening of the cap nut 4, it is inserted from the opening 42 on the tip side of the cap nut 4. There is no interference between the guide sleeve 6 and the tube a, and therefore, the connecting end of the tube a is inserted into the proximal end surface of the guide sleeve 6 that is inserted into the inner peripheral side of the connecting end. 60 is carried out easily until it abuts against the abutment step 11 on the inner circumferential surface of the joint body 1.

Next, when this state is reached, the bag nut 4
Screw in and tighten.

As a result, the O-ring 5 is pushed into the inclined stepped portion 12 under pressure by the proximal end surface 32 of the chuck sleeve 3 pushed in by the cap nut 4, and the inclined surface of the inclined stepped portion 12 allows the O-ring 5 to be pressed into the joint by the inclined surface of the inclined stepped portion 12. The tube is gradually narrowed toward the axial center of the main body 1 and deformed to reduce its diameter, and its inner circumferential surface is tightened to tightly bind the outer circumferential surface of the tube a.

At this time, since a guide sleeve 6 having a slotted groove 6b along the axial direction is fitted into the inner peripheral surface of the tube a, the guide sleeve 6 is tightened by the O-ring 5, and the slotted groove 6b is inserted into the tube a. 6b
Due to the elasticity of the guide sleeve 6b, which reduces the width and diameter and attempts to restore the deformation caused by this,
Press the tube a from the inner circumferential side so as to spread it out.

Therefore, the chileve a is tightly held on the joint body 1 by the O-ring 5 binding from the outer circumferential side and the guide sleeve 6 being tightened from the inner circumferential side by the elasticity of the guide sleeve 6. Watertightness between the tube a and the tube a is reliably maintained.

This watertight maintenance and the tight binding of the tube a are achieved by deforming the O-ring 5 by pushing in the chuck sleeve 3 by tightening the cap nut 4, so that the chuck sleeve 3 is not deformed. For this reason, the torque for tightening the cap nut 4 is made small, and the tube a is not damaged even if the cap nut 4 is tightened until it no longer turns.

In addition, in this way, the connection part of the tube a connected to the joint body 1 is such that the temperature change caused by the hot water or water supplied to the pipe line is transferred from the guide sleeve 6 made of a metal material disposed inside to the joint body 1. The volume change due to temperature change of the guide sleeve 6 made of metal material is smaller than that of tube a made of synthetic resin material, so that the volume of tube a due to temperature change is reduced. This change reduces damage to the connection area and ensures that water leaks are prevented.

〔effect〕

As explained above, the tube connection joint according to the present invention maintains watertightness between the inner peripheral surface of the connecting cylinder portion 1b of the joint body 1 and the outer peripheral surface of the tube a.
An enlarged diameter stepped portion 1 formed on the inner circumferential surface of the connecting cylinder portion 1b.
The O-ring 5 fitted into the chuck sleeve 3 is pressed by the chuck sleeve 3 which is pushed in when the cap nut 4 is tightened.
A guide sleeve with a slotted groove 6b is pushed into the inclined stepped portion 12, compressed and deformed so as to reduce its diameter, and is tightened to tightly bind the outer circumferential surface of the tube a. 6 is reduced in diameter and its restoring force tightens the tube a from the inner circumferential side, thereby maintaining watertightness and tightening the tube. This can be done without deforming the chuck sleeve 3. The nut 4 can be easily tightened without requiring a large torque, and the tube a is not damaged even if the cap nut 4 is tightened until it stops moving.

Moreover, the O-ring 5 and the guide sleeve 6 are
Since the tube a always maintains its elasticity, even if the tube a undergoes volume change and deformation due to thermal changes, water leakage and damage to the tube a are prevented.

Further, when the parts are temporarily stapled, the O-ring 5 is located within the enlarged diameter stepped portion 13 provided on the inner circumferential surface of the connecting cylinder portion 1b of the joint body 1, and receives pressure from the chuck sleeve 3. In addition, since the axis of the ring is held aligned with the axis of the joint body 1, tube a can be easily inserted when the parts are temporarily bound, and tube a can be inserted into the pipe. To simplify the work of connecting to.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view of the conventional means disassembled into its parts, Fig. 2 is a longitudinal side view of the same as the above in the set state, Fig. 3 is a longitudinal side view of the same as the above in the tightened state, and Figs. 4 and 5. is an explanatory diagram of the same action as above, FIG. 6 is a longitudinal cross-sectional side view of the set state of the joint for connecting a tube that can implement the present invention, FIG. 7 is a side view of the same as the above disassembled into each part, and FIG. Vertical side view of the same state as above, FIGS. 9, 10, 11, and 1
FIG. 2 is an explanatory diagram of the process of bringing the temporary fixing state. Explanation of drawing symbols, A...Joint, a...Tube, 1...Joint body, 1a...Main part, 1b...
Connection cylinder part, 10... thread part, 11... abutment step part,
12... Inclined step part, 13... Expanded diameter step part, 14...
Diameter reducing step, 2...Sleeve, 3...Chuck sleeve, 3a...Chuck part, 30...Both ends, 3
1... Flange portion, 32... End face, 33... Swelling part, 3
4... Slit groove, 4... Cap nut, 40... Threaded portion, 41... Tapered portion, 42... Opening, 6...
...Guide sleeve, 6a...Flame, 6b...Slit groove, 60...End face, w...Tapered part, y
... End face, D1, D4 ... Outer diameter, D2, D3 ...
Inner diameter.

Claims (1)

[Scope of utility model registration request] On the tip side, there is a threaded part 1 on the outer circumferential surface for screwing in a cap nut.
A joint body 1 made of a metal material and having a connecting cylinder part 1b for inserting a tube having a shape of 0, and a tube a.
an O-ring 5 made of an elastic material and a chuck sleeve 3 made of a metal material that are fitted onto the outer periphery of the connection end of the tube a; a guide sleeve 6 made of a metal material that is fitted onto the inner periphery of the connection end of the tube a; It consists of a cap nut 4 that is screwed into the threaded part 10 of the connecting cylinder part 1b of the joint body 1, and the outer circumferential surface of the connecting cylinder part 1b of the joint body 1 has an outer side of the O-ring 5 on the distal end side. An enlarged diameter stepped portion 13 is formed with an inner diameter corresponding to the outer diameter of the tube a, and a reduced diameter stepped portion 14 is formed on the proximal side of the enlarged diameter stepped portion 13 with an inner diameter reduced to an inner diameter corresponding to the outer diameter of the tube a. A sloped step portion 12 whose diameter gradually decreases toward the diameter-reduced step portion 14 is formed between the diameter-reduced step portion 14 and the diameter-enlarged step portion 13. The chuck sleeve 3 is provided with an abutment step 11 for receiving the proximal end surface 60 of the guide sleeve 6 which can be fitted into the inner peripheral side of the connecting end of the tube a. An end face 32 facing the side surface of the O-ring 5 is formed on the guide sleeve 6, and a slotted groove 6b extending over the entire length in the axial direction is formed on the circumferential wall of the guide sleeve 6. .