JPH08277984A - Single operation type pipe joint - Google Patents

Abstract

PURPOSE: To provide a single operation type pipe joint requiring no additional fastening by forming a lock groove, in which a ring-shaped coil spring is freely fitted, in a lock nut and forming an engaging groove, to which the ring-shaped coil spring is engaged, on the outer circumference of a pipe to be inserted into an opening part in the lock nut. CONSTITUTION: When a pipe 8 in which an engaging groove 9 is formed in the vicinity of a pipe end part is inserted into an opening part 21 in a lock nut 7, a diameter of a ring spring 6 freely fitted in a lock groove 22, which is formed in an inner circumference of the lock nut 7, is expanded following the insertion of the pipe 8, and in an undercut 23, the ring spring 6 is brought into contact with the end face side of a main body 21. When the pipe 8 is inserted further, a tip 8a of the pipe 8 is brought into contact with O-rings 2, 4 so as to be sealed. If external force in the extracting direction is applied under this condition, the ring spring 6 is fitted in the engaging groove 9 according to the retraction of the pipe 8 so as to be locked by means of the lock groove 22, and as a result, the pipe 8 is prevented from coming off. In removal of the pipe 8, the lock nut 7 is released, and the ring spring 6 is removed from the pipe 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-touch type pipe joint. More specifically, it is used for relatively low-pressure pressure pipes such as air-conditioning refrigerant pipes and hot / cold water pipes, and can be locked by simply inserting the pipe into the fitting body, and can be easily removed. TECHNICAL FIELD The present invention relates to a one-touch type pipe joint and a one-touch type pipe joint that can improve the reliability of a sealing mechanism by re-tightening a lock nut after inserting a pipe into a joint body.

[0002]

2. Description of the Related Art In a conventional pipe joint, as shown in FIG. 10, a tip 62 of a pipe 61 is flared, and a lock nut 63 is tightened to a main body 64. Alternatively, as shown in FIG. In some cases, a packing 67 is interposed between the processed tip 65 and the main body 66 and the lock nut 68 is tightened. Further, as shown in FIG. 12, the pipe 72 is not subjected to any processing, and a tightening ring 71 made of an elastic member is provided between the lock nut 69 and the main body 70 and tightened by tightening the tightening ring 71. For example, the inner peripheral surface 71a of the attached ring 71 is inflated to seal the pipe 68 and fix the pipe 72 at the same time.

[0003]

In the above prior art,
In both cases, in order to secure the connection and to secure the sealing property, it is necessary to turn the female threaded nut shape (lock nut) into the male threaded fitting body and tighten it. There is a problem in that it is troublesome and at the same time the reliability of the sealing property and durability of the connection part cannot be obtained unless tightened with an appropriate torque, and it is necessary to manage the tightened state. Further, there is also one in which a nut-shaped member is fixed and connected by rotating a fastener processed into a bolt shape, but there is the same problem as described above.

In addition, in the case of a structure that can be connected simply by inserting it, it is often the case that the sealing material (elastic body) that constitutes the sealing mechanism cannot be sufficiently compressed, so that it is unlikely to be used as a refrigerant for air conditioning. However, there is also a problem that it is difficult to apply to those that require high sealing performance for piping.

Further, in each case, after tightening by hand at first, additional tightening is performed by using an instrument, but there is a possibility that the additional tightening may be forgotten.

In view of the above circumstances, it is an object of the present invention to provide a one-touch type pipe joint which is reliable in terms of sealing property and durability of a connecting portion and which does not require additional tightening.

It is another object of the present invention to provide a one-touch type pipe joint which can be simply joined by inserting a pipe and whose sealing property can be improved by a little additional tightening.

[0008]

The one-touch type pipe joint of the first invention is (a) a main body provided with a screw mechanism on the outer circumference of the tip and a seal mechanism provided on the inner circumference, and (b) an insertion. The opening having an inner diameter slightly larger than the outer diameter of the pipe, the tapered lock groove whose inner diameter increases from the opening toward the main body, and the larger diameter contacting the larger diameter side of the lock groove and slightly smaller than the large diameter. A ring nut having a large inner diameter escape groove, and a ring-shaped coil spring loosely fitted in the lock groove, and the ring-shaped coil spring is provided on the outer circumference of a pipe inserted from the opening of the lock nut. Is formed with a ring-shaped engagement groove that can be engaged with.

In the one-touch type pipe joint,
It is also preferable that the relief groove is formed on the main body side instead of being formed on the lock nut.

Further, in the one-touch type pipe joint of the second invention, (a) a main body provided with a threading process on the outer periphery of the tip and a seal mechanism provided on the inner periphery, and (b) the outer part of the pipe to be inserted. An opening having an inner diameter slightly larger than the diameter, a tapered lock groove having an inner diameter increasing from the opening toward the main body side, and an inner diameter slightly larger than the large diameter in contact with the large diameter side of the lock groove. A lock nut having an escape groove and a ring-shaped coil spring loosely fitted in the lock groove, and the ring-shaped coil spring is engaged with the outer circumference of a pipe inserted from the opening of the lock nut. A ring-shaped engaging groove is formed, and the sealing mechanism is
An inner end surface of the lock nut, which is composed of a ring-shaped elastic body and a compression member which are inserted from the tip side into a ring-shaped groove formed on the tip-side inner circumference of the body, and which faces the tip surface of the body and the tip surface. In the meantime, by further tightening the lock nut, a gap that allows the compression member to advance toward the elastic body is formed.

[0011]

In the one-touch type pipe joint according to the first aspect of the present invention, the sealing mechanism including the O-ring and the oil seal can ensure the stable sealing performance regardless of the tightened state of the lock nut and the main body.

A ring-shaped coil spring (hereinafter referred to as a ring spring) loosely fitted in the lock nut.
However, since it is a mechanism that engages with and locks the ring-shaped engaging groove formed in the pipe, it does not come off by simply inserting the pipe into the opening, and a tightening step with screws is not required.

Further, according to the second aspect of the invention, when the lock nut is screwed to the main body with a gap left between the front end surface of the main body and the inner end surface of the lock nut or the flange portion of the compression member, which allows for further tightening. Since the elastic body is in its natural state, the compression member advances toward the elastic body by tightening it after inserting the tube, and the elastic body is compressed and the sealing property of the outer circumference of the pipe is improved. Can be increased.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A one-touch type pipe joint of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an explanatory view of an embodiment of the one-touch type pipe joint of the first invention. In FIG. 1, a one-touch type pipe joint of the first invention comprises a main body 1 having O-rings 2 and 4 on the inner peripheral side, a lock nut 7 having a ring spring 6 on the inner peripheral side, and an engagement groove 9 on the outer peripheral side. A tube 8 formed with

The body 1 has a distal end outer periphery 10 which is threaded, and as shown in FIG. 2, there is a hole 11 into which the pipe 8 is inserted, and the inner limit of the insertion of the pipe 8 Is provided with a step 12 that determines. In addition, an annular groove 13 for mounting the O-rings 2 and 4 is provided on the inner circumference of the tip side thereof.
Is provided, and the O-ring 2, the spacer 3, the O-ring 4, and the flanged spacer 5 are fitted into the groove 13 in this order from the back side, so that the O-rings 2 and 4 are fitted. When the O-rings 2 and 4 are fitted by using the spacers 3 and 5 as described above, the main body 1 can be easily processed and can be manufactured at low cost. However, the present invention is not limited to such a form, and two annular grooves may be formed on the inner peripheral side of the main body 1 and the O-rings 2 and 4 may be fitted therein. Also, the number of O-rings is not limited to two, and 1
It is also possible to set one or three or more. Furthermore, instead of the O-ring, a commonly known sealing mechanism such as an oil seal can be adopted.

The main body 1 is made of brass, ordinary steel, stainless steel,
It can be made of an aluminum alloy or the like.

The lock nut 7 has an opening 21 having an inner diameter slightly larger than the outer diameter of the pipe 8 on the inner diameter side, and a tapered lock groove 22 having an inner diameter increasing from the opening 21 toward the main body 1 side. And an escape groove 23 having an inner diameter slightly larger than the large diameter of the lock groove 22, and is screwed to the main body 1 by a screw portion 24 formed further on the inner side.
Although the escape groove 23 is formed on the lock nut 7 side in the illustrated example, the escape groove 23 is not limited to this in the present invention and may be formed on the main body 1 side. In that case, the escape groove 23 is provided so as to face the larger diameter side of the lock groove 22, and the ring spring 6 is configured to be movable from the lock groove 22 toward the escape groove 23 while expanding the diameter. .

The lock nut 7 is preferably made of the same material as that of the main body.

The ring spring 6 is movable from the lock groove 22 toward the escape groove 23 and has an appropriate diameter in a natural state so as not to come out from the opening 21,
It is loosely fitted in the lock groove 22.

The one-touch type pipe joint of the first invention is completed by screwing the lock nut 7 with the ring spring 6 inserted into the main body 1, and on the other hand, the connecting pipe 8 is
The engagement groove 9 is formed in advance.

The material of the tube 8 is selected according to the type of fluid passing through the tube, the usage conditions, the environmental conditions outside the tube, and the like. Further, the engagement groove 9 is provided at a position at a distance L from the end portion 8a of the pipe 8, and the cross-sectional shape thereof is a semicircular shape substantially equal to the cross-sectional diameter of the ring spring 6 because the engagement force is maximized. preferable. Further, it is preferable that the tip end 8a of the tube 8 is smoothly and slightly reduced in diameter so as to be easily inserted. As shown in FIG. 5, the distance L is O when the tip 8a of the pipe 8 has two O's when the ring spring 6 is engaged with the engagement groove 9.
At the time when the tip 8a of the tube 8 comes into contact with the step 12 of the main body 1 as shown in FIG. The length of the ring spring 6 retracted in the escape groove 23 can be received in the engagement groove 9 as much as possible. The engagement groove 9 can be formed by rolling or cutting in the case of a thick-walled pipe.

Next, the operation of the one-touch type pipe joint of the first aspect of the present invention will be described with reference to FIGS.

As shown in FIG. 2, the tube 8 is formed with an engagement groove 9 in advance. The tube 8 is inserted through the opening 21. The inner diameter of the ring spring 6 is smaller than the outer diameter of the tube 8 in a natural state, and as shown in FIG. 3, when the tube 8 is inserted, the tip of the tube 8 pushes the ring spring 6 inward,
In the clearance groove 23, the ring spring 6 abuts on the end face side of the main body 1 and is expanded in diameter.

As shown in FIG. 4, the tube 8 is further pushed in, and the seal is completed when the tip 8a of the tube 8 passes through the O-rings 2 and 4, but at the step 12 at the back of the main body 1. The tube 8 can be inserted until the tip 8a abuts.

However, when an external force in the pulling direction is applied,
As shown in FIG. 5, as the tube 8 retracts, the ring spring 6 fits into the engagement groove 9 and is locked in the lock groove 22, so that the tube 8 is prevented from coming out.

Although the joining of the pipes 8 is completed as described above, the lock nut 7 is removed from the main body 1 and the ring spring 6 is removed from the pipes 8 if it becomes necessary to remove the pipes 8 for some reason. Thus, the tube 8 can be easily pulled out. After that, the ring spring 6 is returned into the lock nut 7 and reassembled into the main body 1 to be in a reusable state.

As shown in FIG. 1, the seal mechanism 30 in the first invention comprises an elastic body 31 and a collar spacer 5, but in the one-touch type pipe joint of the second invention,
The flanged spacer 5 is configured to compress the elastic body 31 in the axial direction.

Next, an embodiment of a one-touch type pipe joint which can improve the sealing property by compressing the elastic body 31 in the axial direction will be described with reference to FIGS.

In FIG. 6, the elastic body 31 is composed of an O-ring 2, a spacer 3 and an O-ring 4 which are sequentially inserted into an annular groove 13 formed on the inner periphery of the body 1 on the tip side. However, the present invention is not limited to such a form, and by compressing in the axial direction, it expands in the radial direction to reduce the inner diameter,
Any material may be used as long as it has elasticity so as to improve the sealing property with the outer circumference of the tube 8. Also, the number of O-rings is 2
The number is not limited to one, and may be one or three or more. In that case, it is preferable to provide a spacer 3 similar to that shown in FIG. 6 between the O-rings in order to improve the sealing property.

The compression member in the second aspect of the invention has a collar-like spacer 5 having a collar portion 5a formed on the outer periphery thereof as well as a collar member shown in FIG. It may be a simple torus 55. However, at least when the elastic body 31 is in the natural state, there is a gap S2 between the front end surface 1a of the main body 1 and the flange portion 5a of the flanged spacer 5 facing the front end surface 1a, and the lock nut 7
Between the front end surface 7a and the outer peripheral step surface 1b of the main body 1, there is left a gap S1 in which tightening can be performed. When the compression member is the annular body 55, the tip surface 1 of the main body 1
a and the inner end surface 7 of the lock nut 7 facing the front end surface 1a
A gap S2 is formed between it and b.

In FIG. 6, when the pipe 8 is inserted through the opening 21, the ring spring 6 fits into the engagement groove 9 and cannot be easily removed. At this time, the O-rings 2 and 4 are pressed by the tube 8 in the radial direction as shown in FIG. 7, and the sealing property can be maintained. Therefore, the tube 8 can be easily joined to the main body 1 simply by inserting the tube 8.

In the one-touch type pipe joint of the present invention, the lock nut 7 is further tightened, and the flanged spacer 5 is axially advanced toward the O-rings 2 and 4, whereby the structure shown in FIG.
As shown in FIG. 3, the collared spacer 5 compresses the O-rings 2 and 4 in the axial direction, and the adhesion to the pipe 8 is enhanced. This enhances the sealing function.

[0034]

As described above, the one-touch type pipe joint of the first aspect of the invention can be connected simply by inserting the pipe into the opening of the main body to which the lock nut is screwed. Its structure is simple and can be manufactured inexpensively. Also, O
By adopting a seal mechanism with a ring and an oil seal, it is highly reliable in terms of sealability and durability, and it is not necessary to screw it by hand like in the past and to tighten it with a fastener. , It can be connected quickly, can work in a narrow space, and there is no worry of trouble due to improper tightening torque.

Further, in the one-touch type pipe joint of the second invention, not only can the pipe be connected with good sealing performance by simply inserting the pipe, but also by inserting the pipe and further tightening the lock nut, the seal can be further sealed. Since the property can be improved, the gas permeation amount of the refrigerant or the like can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view before assembly showing an embodiment of the one-touch type pipe joint of the first invention.

FIG. 2 is a cross-sectional explanatory view of the one-touch type pipe joint of FIG.

FIG. 3 is a cross-sectional explanatory view of the one-touch type pipe joint of FIG.

FIG. 4 is a cross-sectional explanatory view of the one-touch type pipe joint of FIG.

5 is a cross-sectional explanatory view of the one-touch type pipe joint of FIG.

FIG. 6 is an explanatory view of an embodiment of the one-touch type pipe joint of the second invention.

7 is an operation explanatory view of the one-touch type pipe joint of FIG.

8 is an operation explanatory view of the one-touch type pipe joint of FIG.

9 is an explanatory view of another embodiment of the compression member in FIG.

FIG. 10 is a cross-sectional explanatory view of a conventional pipe joint.

FIG. 11 is a cross-sectional explanatory view of a conventional pipe joint.

FIG. 12 is a cross-sectional explanatory view of a conventional pipe joint.

[Explanation of symbols]

 1 Main Body 2, 4 O Ring 5 Collar Spacer (Compression Member) 5a Collar 6 Ring Spring (Ring Coil Spring) 7 Lock Nut 8 Pipe 9 Engagement Groove 13 Groove 30 Seal Mechanism 31 Elastic Body 55 Annular Body (Compression Member) S1, S2 gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenzo Kimura 632-1 Kawacho, Higashikawanabe, Kanzaki-gun, Hyogo Prefecture (72) Inventor Yasuyuki Shimizu 28-1 Takamachi, Shikama-ku, Himeji-shi, Hyogo Prefecture

Claims (4)

[Claims] 1. A body having (a) a threaded outer periphery and a seal mechanism provided on the inner periphery, and (b)
An opening with an inner diameter slightly larger than the outer diameter of the tube to be inserted,
The lock groove has a taper-shaped lock groove whose inner diameter increases from the opening toward the main body, and a relief groove which is in contact with the large diameter side of the lock groove and has an inner diameter slightly larger than the large diameter. A ring nut is formed by loosely fitting a ring-shaped coil spring, and a ring-shaped engagement groove with which the ring-shaped coil spring can be engaged is formed on the outer periphery of a pipe inserted from the opening of the lock nut. One-touch type pipe joint characterized by 2. The one-touch type pipe joint according to claim 1, wherein the relief groove is formed on the main body side instead of being formed on the lock nut. 3. (a) a main body having a tip end outer periphery threaded and a seal mechanism provided on the inner periphery; and (b)
An opening with an inner diameter slightly larger than the outer diameter of the tube to be inserted,
The lock groove has a taper-shaped lock groove whose inner diameter increases from the opening toward the main body, and a relief groove which is in contact with the large diameter side of the lock groove and has an inner diameter slightly larger than the large diameter. A ring nut is formed by loosely fitting a ring-shaped coil spring, and a ring-shaped engagement groove for engaging the ring-shaped coil spring is formed on the outer periphery of a pipe inserted from the opening of the lock nut. And the sealing mechanism includes an annular elastic body and a compression member that are inserted from the tip side into an annular groove formed on the tip side inner circumference of the body, and the tip surface of the body and the tip surface. A one-touch type pipe joint is formed between the inner end surface of the lock nut opposed to, and by which the compression member can be advanced toward the elastic body by retightening the lock nut. 4. A flange portion is formed on the outer periphery of the compression member so as to face the tip end surface of the main body, and the compression member is elastically tightened by tightening the lock nut between the tip end surface of the main body and the flange portion. The one-touch type pipe joint according to claim 3, wherein a gap that can advance toward the body is formed.