JP4749616B2 - Plug-in fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plug-in pipe joint having a good sealing property, and more particularly to a plug-in pipe joint that can be satisfactorily sealed and prevented by simply inserting a bellows pipe into a joint body.
[0002]
[Prior art]
In general, as a plug-in type pipe joint for connecting a flexible pipe through which a fluid such as a gas flows, a joint disclosed in, for example, Utility Model Publication No. 2565469 is known. FIG. 5 is a cross-sectional view showing a pipe joint disclosed in the above-mentioned publication. As shown in the figure, this pipe joint includes a socket 4 in which a connection hole 2 into which a flexible bellows pipe F is inserted is formed. The tightening member 6 screwed into the open end of the socket 4 and the substantially C-shape mounted between the both ends of the socket 4 and the tightening member 6 so that the tightening member 6 is positioned at the initial screwing position. A positioning member 8; a plurality of retainers 10 which are radially arranged inside the connection hole 2 of the socket 4 and whose inner peripheral surface is formed in an uneven shape corresponding to the outer peripheral surface of the bellows tube F; A holding member 12 is provided that elastically holds the retainer 10 so that the inner diameter is enlarged and reduced. Then, after inserting the bellows tube F between the plurality of retainers 10, the positioning member 8 is removed and the tightening member 6 is screwed and tightened to press the retainer 10 toward the bottom of the connection hole 2. The tube F is fixed to the socket 4.
[0003]
[Problems to be solved by the invention]
By the way, in the above-described conventional pipe joint, when the bellows pipe F is inserted into the connection hole 2 and the positioning member 8 is removed and then the fastening member 6 is fastened to the socket 4, this is performed using a tool (not shown). It is like that. For this reason, there is still a work of tightening with a tool. For this reason, for example, after inserting the bellows tube F, there is a problem that the tightening may be forgotten to cause leakage. In addition, there is a trouble of removing the positioning member, and it cannot be easily connected. Furthermore, an elastic holding member for holding a plurality of retainers is required, and the structure is complicated.
[0004]
Therefore, the present applicant has disclosed a plug-in pipe joint that can be easily connected by simply inserting the bellows tube in the previous application (Japanese Patent Application No. 11-316155). However, this pipe joint has the advantage that it can be connected simply by being inserted, but has an improvement in that the structure is somewhat complicated because a spring or the like is provided inside.
Further, as other conventional pipe joints, those disclosed in JP-A-5-164280, JP-A-5-31289, JP-A-6-58474, JP-A-6-58475, etc. are also known. It has been. In the pipe joints shown in each of these known examples, all use ring springs that are ring-shaped and elastically expandable and contractible, and are fitted into the recesses of the bellows pipe to lock the pipe joints. By doing so, the bellows tube is prevented from falling off and falling off.
[0005]
However, in this case, since the ring spring has a structure to be mounted in the pipe joint in an expanded state, a member for maintaining the expanded state is required, and the number of parts increases. There was a problem.
The present invention has been devised to pay attention to the above problems and to effectively solve them. An object of the present invention is to provide a plug-in pipe joint that can be securely sealed and attached simply by inserting the bellows pipe into the joint body, and that is simple in structure and safe.
[0006]
[Means for Solving the Problems]
In the related art of the present invention, in an insertion-type pipe joint for connecting a bellows tube having an uneven portion whose outer peripheral surface is wave-like, a tube insertion hole for inserting the bellows tube is formed, and an inner wall surface is stepped. A joint body formed in a part shape, a ring-shaped packing member slidably provided along the inner wall surface of the joint body, and provided on the distal end side of the joint body and engaged with the packing member. A ring-shaped nut member that is slidable integrally with the packing member, an engagement protrusion that is provided on the packing member and abuts against a distal end of the bellows tube when the bellows tube is inserted; A stop ring member that engages with the nut member to prevent the nut member from being pulled out when the nut member is inserted into the joint body, and the nut member has a force in the pulling direction applied to the bellows tube Through the bellows tube Mesuru a bayonet type pipe joint, wherein a detachment prevention tapered surface for pressing into the recess of the bellows tube a retaining member is deformed to shrink direction are formed.
[0007]
According to this, when the bellows tube is inserted, the tip abuts against the ring-shaped retainer member, and the bellows tube is inserted into the retainer member while expanding and contracting the diameter of the retainer member, and further the bellows tube is pushed. This tip abuts on an engagement protrusion provided on the packing member, and the stop ring member is engaged with the nut member at a position where the packing member and the nut member are pushed together and the nut member is fitted to the innermost part. If the force is applied to the bellows tube in the pulling direction, the bellows tube is prevented from being pulled out due to the action of the taper preventing surface formed on the nut member. By simply inserting the bellows tube into the joint body and inserting the bellows tube, the bellows tube can be connected while maintaining good sealing performance. Therefore, the bellows tube can be easily and reliably connected without complicating the structure of the plug-in type pipe joint.
[0008]
The invention defined in claim 1 is an insertion-type pipe joint for connecting a bellows tube having an uneven portion whose outer peripheral surface is formed in a wavy shape, wherein a tube insertion hole for inserting the bellows tube is formed, and an inner wall surface A joint body formed in a stepped shape including a reduced diameter stepped portion, a ring-shaped packing member slidably provided along the inner wall surface of the joint body, and provided on the distal end side of the joint body. A ring-shaped nut member that is slidable with respect to the joint body; an engagement protrusion that is provided on the packing member and comes into contact with a distal end of the bellows tube when the bellows tube is inserted; and the nut A stop ring member that engages with the nut member when the member is inserted into the joint body and prevents the member from coming off, and when the nut member is applied with a force in the pulling direction to the bellows tube A retainer for retaining the bellows tube Na member detachment prevention tapered surface pressing is formed to the recessed portion of the bellows tube by deforming the diameter direction by inserting the bellows tube into the joint body, the packing member is the back side of the joint body And the outer peripheral surface of the portion of the packing member in contact with the outer peripheral surface of the bellows tube is elastically contracted over the reduced diameter step portion, and the inner peripheral surface of the packing member and the outer periphery of the bellows tube It is a plug-in type pipe joint, characterized in that the surface is tightly sealed.
In this case, as defined in claim 2, the total length of the nut member and the packing member that is inserted into the joint body is equal to the length of the pipe insertion hole of the joint body.
Further, for example, the engagement protrusion is provided at the base end portion of the packing member, and is formed of a ring-shaped fireproof packing member whose inner diameter is set smaller than the diameter of the concave portion of the bellows tube.
The front Symbol stop ring member For example is made from elastically collapsible so it made a ring-like coil members in a radial direction.
[0009]
For example, as defined in claim 3, the base end portion of the nut member and the tip end portion of the packing member are engaged by fitting an uneven engagement stepped portion, and the nut member and the packing The member is configured to be movable along the inner wall of the joint body .
For example, as defined in claim 4 , the base end portion of the nut member and the tip end portion of the packing member are engaged by being firmly joined using an adhesive, and the nut member and the packing are engaged. The member is configured to be movable along the inner wall of the joint body .
Further, as defined in claim 5, when the bellows tube is inserted into the joint body, a coil ring shape is inserted into the bellows tube while elastically expanding and contracting in the radial direction of the bellows tube. The retainer member is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Below, one Example of the insertion type pipe joint which concerns on this invention is explained in full detail based on an accompanying drawing.
1 is a cross-sectional view showing a plug-in type pipe joint and a bellows pipe according to the present invention, FIG. 2 is a plan view showing a coil ring-shaped retainer member, and FIG. 3 is a process showing a process of inserting the bellows pipe into the plug-in pipe joint. FIG.
As shown in the figure, this plug-in type pipe joint 16 is for connecting a flexible bellows pipe F made of, for example, stainless steel, and the outer peripheral surface of the bellows pipe F is formed in a wave-like shape with concave portions 18 and convex portions 20. It is formed and covered with a coating layer 22 made of a soft resin such as soft vinyl chloride, except for the connected tip.
[0011]
The insertion-type pipe joint 16 has a joint body 26 in which the inner wall surface is formed in two steps to insert the bellows pipe F and a pipe insertion hole 24 is formed, and a pipe insertion hole 28 in the center. The ring-shaped nut member 30 formed and a packing member 32 engaged with the nut member 30 and slidably provided along the inner wall surface of the joint body 26 are mainly configured. Has been. The nut member 30 is formed, for example, in a ring shape from brass or the like, and has a tube insertion hole 28 having a size that allows the bellows tube F to be inserted therethrough. The outer surface of the nut member 30 has a cylindrical shape, for example. A water-tight O-ring 34 made of a circular ring-shaped elastic body is interposed on the outer peripheral surface on the base end side of the nut member 30 so that moisture does not enter inside.
[0012]
The packing member 32 is made of a synthetic rubber elastic body, and is formed so as to be substantially inscribed in the joint body 26 in the same manner as the nut member 30. The packing member 32 includes an airtight packing member 32A on the front end side and a fireproof packing member 32B on the rear end side, and both the packing members 32A and 32B are integrally formed of synthetic rubber suitable for each application.
A convex ring-shaped engagement step portion 48 is formed at the tip of the airtight packing member 32A, and a concave ring-shaped engagement step is formed at the base end portion of the nut member 30. parts and 50 is formed, both uneven engagement step 50,48 is coupled to each other fit each other, and the nut member 30 and the packing member 32 is integrally joint body 26 as described above It can move while sliding along the inner wall.
[0013]
Further, a watertight packing member 36 made of a circular ring-shaped elastic body is mounted along the circumferential direction on the inner peripheral surface on the distal end side of the nut member 30, and an inner protrusion 36 </ b> A of the watertight packing member 36. Is sealed in close contact with the covering layer 22 of the bellows tube F into which the corrugated tube F has been inserted to prevent the entry of corrosive water or the like into the pipe joint from the outside.
Further, on the outer peripheral surface of the nut member 30 on the tip end portion side, a stop ring taper surface 40 that is inclined outward in the radial direction as it goes in the tip direction is formed. The distal end of the tapered surface 40 is reduced in a stepped shape, and a stop ring member is fitted into the stepped portion 40A as will be described later. Further, the base end portion of the tapered surface 40 is radially expanded to form a stepped portion 40B. The stepped portion 40B and a ring-shaped stop ring receiving recess 42 provided on the inner wall of the joint body 26 are provided. Between them, a stop ring member 44 made of a ring-shaped coil member whose radius can be expanded and contracted is provided.
[0014]
Further, a through hole that passes through in the radial direction is provided in a part of the joint main body 26, and a selectively permeable member 46 (trade name: which does not permeate solids or liquids, but allows gas to permeate from the inside to the outside through the through hole. Sun map) is attached.
The permselective member 46 allows gas to permeate from the inside of the joint to the outside. If a gas leaks due to a hole in the bellows tube F by nailing or the like, the surface of the bellows tube F and the resin coated on the outer surface of the bellows tube F should be used. The gas enters the joint through the gap between the coating layer 22 and the gas passes through the permselective member 46 and is ejected to the outside of the pipe joint 16. For this reason, after the bellows tube F is piped, the gas leak detector is brought close to the portion of the selectively permeable member 46 of the pipe joint 16 so that the hole opening failure of the bellows tube F can be easily detected. Gas accidents can be prevented.
[0015]
In the vicinity of the engaging portion between the nut member 30 and the packing member 32, a ring-shaped retainer accommodating space 52 having a substantially concave section is formed. A coil ring-shaped retainer member 54 formed by forming a coil spring into a ring shape as shown in FIG. Therefore, the coil ring-shaped retainer member 54 can be elastically expanded and contracted in the radial direction to change its diameter elastically. Here, the retainer member 54 is fitted into the retainer accommodating space 52 in a substantially natural state that is not expanded or contracted in the radial direction. The outer diameter D1 (see FIG. 2) of the retainer member 54 is set to be slightly larger than the inner diameter of the airtight packing member 32A, and when the bellows tube F is inserted deeply, the retainer member 54 The airtight packing member 32 </ b> A is caught at the tip of the housing space 52 so as not to go outside.
[0016]
Further, the inner diameter D2 of the retainer member 54 in the natural state is set so as to be approximately halfway between the diameter of the convex portion 20 of the bellows tube F and the diameter of the concave portion 18, and when the bellows tube F is inserted. The bellows tube F is inserted into the ring-shaped retainer member 54 while elastically expanding and contracting its diameter.
The base end portion of the nut member 30 is formed with a slip prevention taper surface 56 that is inclined at a predetermined angle in the axial direction along the distal direction at a predetermined angle. When the force is applied in the pulling direction, the retainer member 54 abuts against the slip-off preventing taper surface 56 to reduce the diameter so that the retainer member 54 fits into the concave portion 18 of the bellows tube F and prevents the bellows tube F from slipping out. It has come to be able to do.
[0017]
On the other hand, the outer peripheral end 58 of the base end portion of the airtight packing member 32A in the packing member 32 is formed into a curved surface, and when the airtight packing member 32A is pushed in, it is elastically bent and deformed. The joint body 26 can easily slide over the reduced diameter step portion 60 on the distal end side and slide to the inside of the joint body 26. At this time, the reduced diameter step portion 60 of the joint body 26 is also formed in a curved shape so as to make it easier to get over the airtight packing member 32A.
The fireproof packing member 32B connected to the base end portion of the packing member 32 is formed in a ring shape and is made of a special synthetic rubber containing, for example, expanded graphite, and is exposed to a high temperature during a fire or the like. When this occurs, the volume of the fireproof packing member 32B expands to seal the inside. Here, the inner diameter of the fireproof packing member 32B is set to be smaller than the diameter of the concave portion 18 of the bellows tube F, and is also configured as an engagement protrusion 62. It comes in contact with it and receives it.
The base end portion of the joint body 26 is further reduced in diameter to be formed as a stopper step portion 64, and is set slightly smaller than the inner diameter of the concave portion 18 of the bellows tube F inside the stopper step portion 64. A cylindrical support cylinder 66 having an outer diameter is provided so as to extend forward.
[0018]
Next, the usage method of the insertion type pipe joint comprised as mentioned above is demonstrated.
First, the worker inserts the distal end portion of the bellows tube F through the tube insertion hole 28 of the nut member 30 and the tube insertion hole 24 of the joint body 26 from the state shown in FIG. The state at this time is shown in FIG. 3 (A). The tip of the bellows tube F abuts on the ring-shaped retainer member 54, and this diameter is elastically expanded to enter the inside. The airtight packing member 32A is in contact with the tip.
When the bellows tube F is further pushed in from this state, the bellows tube F passes through the ring-shaped retainer member 54 while expanding and contracting the diameter of the ring-shaped retainer member 54, as shown in FIG. The bellows tube F comes into contact with the inner peripheral surface of the airtight packing member 32A and elastically deforms the inner belly tube F, and further enters the back. 62 abuts. At this time, the nut member 30 and the packing member 32 are not slid. Further, when the ring-shaped retainer member 54 expands and contracts and the bellows tube F passes inside, the operator can confirm a click feeling associated with the expansion and contraction.
[0019]
The example shown in FIG. 3B shows a state in which the three convex portions 20 have passed through the ring-shaped retainer member 54, and at the same time when the bellows tube F is inserted, the ring-shaped inner protrusion of the watertight packing 36 is shown. The portion 36A is in contact with the outer peripheral surface of the covering layer 22 of the bellows tube F in a bent state, and the airtightness thereof is maintained.
Here, when the bellows tube F is further pushed in, the tip of the bellows tube F is blocked by the fireproof packing member 32B as described above, so this time, together with the bellows tube F, the fireproof packing member 32B and the airtight packing member. 32A and the nut member 30 connected to the hermetic packing member 32A are all slid together and the tip of the refractory packing member 32B contacts the stopper step 64 at the back of the joint body 26. When this happens, the slide movement stops. The state at this time is shown in FIG. As a result, the bellows tube F is completely attached to the pipe joint 16.
[0020]
At this time, as the airtight packing member 32A is pushed inward, the outer peripheral surface is elastically reduced in diameter toward the center of the pipe joint 16 by the reduced diameter step portion 60 of the joint body 26. Therefore, the inner peripheral surface of the bellows and the outer peripheral surface of the bellows tube F are brought into close contact with each other with a large pressure, and the sealing performance of this portion can be maintained high.
Further, as the nut member 30 is pushed deeper, the stop ring member 44 installed in the space formed by the stepped portion 40B on the outer peripheral surface and the concave portion 42 formed on the inner peripheral surface of the joint body 26 is disposed on the inner side. As the stop ring inclined surface 40 passes, the diameter gradually increases. The expansion of the stop ring member 44 at this time is allowed by the space formed by the stop ring accommodating recess 42. When the stop ring member 44 passes through the leading edge 40A of the inclined surface 40, the stop ring member 44 falls into the leading end step portion to reduce the diameter, so that even if a force is applied to the nut member 30 in the pulling direction, The ring member 44 interferes with the wall surface of the stop ring housing recess 42 of the joint body 26, and this pulling out is prevented.
[0021]
At this time, if the entire length of the nut member 30 and the packing member 32 in the engaged state is set in advance so as to be the length inserted into the joint body 26, FIG. The operator can confirm that the bellows pipe F and the pipe joint 16 are completely connected when the nut member 30 is completely inserted into the joint body 26 as shown in FIG. According to this, it is not necessary to provide a mark serving as a guide for the insertion length of the bellows tube F on the surface of the coating layer 22 of the bellows tube F.
Here, when a force is applied to the bellows tube F in the pulling direction, the retainer member 54 fitted in the concave portion 18 of the bellows tube F is formed on the proximal end portion of the nut member 30 so as not to come off. The ring-shaped retainer member 54 is pressed in the diameter-reducing direction by abutting with 56. Accordingly, the retainer member 54 is sandwiched between the slip-off preventing taper surface 56 and the concave portion 18 of the bellows tube F so that the further movement is blocked, and the bellows tube F comes off the pipe joint 16 and falls off. Never do.
[0022]
Thus, without complicating the structure of the pipe joint 16 so much, the bellows pipe F can be mounted while maintaining a reliable sealing property simply by inserting and pushing the bellows pipe F into the pipe joint 16. Moreover, it is possible to prevent the bellows tube F from coming out of the pipe joint 16 and falling off. In addition, every time the retainer member 54 gets over one of the concavo-convex portions 18 and 20 of the bellows tube F, the operator can feel a click, so that the insertion state can be grasped sensuously.
In the above-described embodiment, the recessed space formed between the escape preventing taper surface 52 and the inner peripheral surface of the airtight packing member 40 is the retainer accommodating space 52. Instead, the base end of the nut member is used. You may make it form a retainer accommodation space in a part.
[0023]
FIG. 4 is a cross-sectional view showing a modification of the plug-in pipe joint of the present invention. The same members as those shown in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
Here, as shown in FIG. 4, a slip prevention taper surface 56 is provided on the base end side of the nut member 30, and further, a ring-shaped protrusion 70 is provided at the end toward the inside in the radial direction. A space formed between the projecting portion 70 and the removal preventing taper surface 56 is defined as a retainer accommodating space 52, in which the retainer member 54 is accommodated. In this case, since the nut member 30 is formed of a hard member such as stainless steel, the diameter of the retainer member 54 is allowed to expand and contract when the bellows tube F is inserted on the inner surface side defining the retainer accommodating space 52. For this purpose, an elastic member 72 made of, for example, cellular urethane or the like having a predetermined thickness is provided in a ring shape. In addition, the retainer member 54 may be accommodated in the retainer accommodating space 52 in a loosely fit state without providing the elastic member 72 so long as the central axis of the retainer member 54 is not greatly displaced.
[0024]
Also in the case of this embodiment, when the bellows tube F is inserted, the coil ring-shaped retainer member 54 abuts against the protrusion 70 of the nut member 30 and is held here, and the inside of the retainer member 54 is held inside the bellows tube F. Is inserted while expanding and reducing the diameter of the retainer member. Also in this case, without making the structure of the pipe joint 16 so complicated, the bellows pipe F can be mounted while maintaining a reliable sealing property by simply inserting the bellows pipe F into the pipe joint 16 and pushing it in. Moreover, it is possible to prevent the bellows tube F from coming out of the pipe joint 16 and falling off.
In addition, the material of each member in each of the above embodiments is merely an example, and it is needless to say that the material is not limited thereto. Further, in the packing member 32, an airtight packing member may be provided in the portion of the fireproof packing member 32B, and conversely, a fireproof packing member may be used in the portion of the airtight packing member 32A.
[0025]
【The invention's effect】
As described above, according to the plug-in type pipe joint of the present invention, the following excellent operational effects can be exhibited.
According to the present invention, when the bellows tube is inserted, the tip abuts against the ring-shaped retainer member, and the bellows tube is inserted into the retainer member while expanding and contracting the diameter of the retainer member, and further the bellows tube is pushed in. This tip abuts against an engaging projection provided on the packing member, and the packing member and the nut member are pushed together . At this time, the reduced diameter step provided on the joint body pushes the packing member into the packing member. Is elastically reduced in diameter, so that the inner peripheral surface of the packing member and the outer peripheral surface of the bellows tube can be tightly sealed. Further, at the position where the nut member is fitted to the innermost position, the stop ring member engages with the nut member to prevent the withdrawal, and when a force is applied to the bellows tube in the pulling direction, the nut member Since the bellows tube is prevented from being pulled out by the action of the anti-disengagement taper surface formed in the bellows, the bellows tube is sufficiently inserted into the joint body and inserted, and the bellows tube is maintained with good sealing performance. Pipe connections can be made.
Therefore, the connection operation of the bellows tube can be performed easily and reliably without complicating the structure of the plug-in type pipe joint so much .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a plug-in pipe joint and a bellows pipe of the present invention.
FIG. 2 is a plan view showing a coil ring-shaped retainer member.
FIG. 3 is a process diagram showing a process of inserting a bellows pipe into an insertion pipe joint.
FIG. 4 is a cross-sectional view showing a modification of the plug-in type pipe joint of the present invention.
FIG. 5 is a cross-sectional view showing a conventional general plug-in fitting.
[Explanation of symbols]
16 Plug-in type pipe joint 18 Recess 20 Protrusion 22 Cover layer 26 Joint body 30 Nut member 32 Packing member 32A Airtight packing member 32B Fireproof packing member 44 Stop ring members 48, 50 Engagement step portion 54 Retainer member 56 Rejection prevention taper surface 62 Engagement protrusion F Bellows tube

Claims (5)

In the plug-in type pipe joint for connecting the bellows pipe having the concavo-convex part whose outer peripheral surface is formed in a wavy shape,
A joint body in which a tube insertion hole for inserting the bellows tube is formed and the inner wall surface is formed in a stepped shape including a reduced diameter stepped portion;
A ring-shaped packing member slidably provided along the inner wall surface of the joint body;
A ring-shaped nut member provided on the distal end side of the joint body and made slidable with respect to the joint body;
An engagement protrusion provided on the packing member and abutting against a distal end of the bellows tube when the bellows tube is inserted;
A stop ring member that engages with the nut member when the nut member is inserted into the joint body to prevent the nut member from coming off;
The nut member is formed with a taper preventing face that prevents the bellows tube from coming off when a force is applied to the bellows tube in the pulling direction, and deforms in a reduced diameter direction to press the concave member of the bellows tube. And
By inserting the bellows tube into the joint main body, the packing member is pushed into the inner side of the joint main body, and the outer peripheral surface of the packing member in contact with the outer peripheral surface of the bellows tube is the reduced diameter step. An insertion-type pipe joint, wherein the diameter of the packing member is elastically reduced over the portion, and the inner peripheral surface of the packing member and the outer peripheral surface of the bellows tube are tightly sealed.   2. The plug-in type pipe joint according to claim 1, wherein a total length of the nut member and the packing member inserted into the joint main body is equal to a pipe insertion hole length of the joint main body. The base end portion of the nut member and the tip end portion of the packing member are engaged by fitting an uneven engagement stepped portion, and the nut member and the packing member extend along the inner wall of the joint body. The plug-in type pipe joint according to claim 1 or 2, wherein the pipe-type pipe joint is configured to be movable . The proximal end portion of the nut member and the distal end portion of the packing member are engaged by being firmly joined using an adhesive, and the nut member and the packing member are aligned along the inner wall of the joint body. The plug-in type pipe joint according to claim 1 or 2 , characterized by being configured to be movable . A coil ring-like retainer member is provided in the joint body to allow the bellows tube to be inserted inward while elastically expanding and contracting in the radial direction of the bellows tube when the bellows tube is inserted. The plug-in type pipe joint according to any one of claims 1 to 4 .

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