JP2011112180A - Plug-in pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug-in pipe joint, capable of surely performing one-touch connection of a connecting pipe by preventing the connecting pipe from being inserted obliquely to a joint body to thereby solve a connecting failure resulting from extremely oblique insertion of the connecting pipe. <P>SOLUTION: The plug-in pipe joint 1 includes a joint body 2 which has a socket 22 for receiving the connecting pipe 11 at an end portion thereof; a collar 4 which is engagingly locked within the socket 22 while holding a locking member 5 to be pressed onto the outer surface of the connecting pipe 11 in an expansible and contractible manner; and an elastic member 6 which biases the locking member 5 to the end portion of the joint body 2 through the collar 4. The pipe joint further includes a regulation portion 71 which is inserted to a gap between the inner surface at the end portion of the joint body 2 and the outer surface at the end portion of the collar 4 to regulate the radial movement of the collar 4, and a collar protection portion 72 which is provided so that the connecting pipe 11 can be inserted thereto and has a guide hole 73 for guiding the insert of the connecting pipe 2 in the central axis direction of the joint body 2, and a guide member 7 fixed to the end part of the joint body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plug-in type pipe joint used for connecting a pipe such as a stainless steel pipe for water supply or hot water supply with one touch.

  As this type of one-touch type plug-in pipe joint, there is a plug-in pipe joint shown in FIG. This plug-in type pipe joint 1a contacts the outer periphery of the joint body 2 having a receiving port (large diameter part) 22 into which the connection pipe 11 is inserted, and prevents the connection pipe from being pulled out of the joint body 2. The retaining member 5, the collar 4 that holds the retaining member 5 and is disposed inside the receiving port, and the elastic member that biases the retaining member through the collar 4 toward the tapered surface 26 formed on the inner surface of the receiving port. 6 (see Patent Document 1). When the connecting pipe 11 is inserted into the receptacle 22, the plug-in pipe joint 1a is expanded in diameter so that the retaining member 5 moves to the joint back side together with the collar 4 and the tip thereof is along the outer periphery of the connecting pipe. Therefore, the connecting pipe is inserted into the inner side of the joint body. At this time, the retaining member 5 is urged by the elastic member 6 through the collar to the tapered surface 26 formed on the inner surface of the receiving port, and the tip thereof is The connection pipe 11 is pressed against the outer peripheral portion of the connection pipe 11 to prevent the connection pipe from being removed. As a result, a so-called one-touch connection is realized in which the connection is completed simply by inserting the connection pipe 11 into the joint body 1a.

JP 2009-2456 A (FIGS. 1 to 10)

  However, in the conventional plug-in type pipe joint, since the end of the collar 4 on the back side of the joint is only supported by the elastic member 6, the connecting pipe is formed from an extremely oblique direction with respect to the axis of the joint. When the end of the collar 4 is pushed by the end of the connecting tube by mistake, the collar 4 is greatly tilted inside the receiving port, and the diameter expansion operation of the retaining member 5 is hindered. There is a risk that one-touch connection of the tubes may not be possible (see FIG. 7). Furthermore, when the collar is extremely inclined, the retained retaining member 5 may fall off the collar 4 and the connection pipe 11 cannot be connected.

  The present invention has been made in order to solve such problems, and the object thereof is not to worry that the connecting pipe is inserted from an extremely oblique direction with respect to the central axis of the joint. It is an object of the present invention to provide a plug-in type pipe joint capable of reliably performing a one-touch connection of a connecting pipe without fear of erroneous operation of the collar due to the end portion.

In order to achieve the above object, the plug-in type pipe joint of the present invention is
A joint body having a receiving port for receiving the connecting pipe formed at the end;
A collar that is locked inside the receiving port, while holding the retaining member pressed against the outer surface of the connecting pipe so as to be able to expand and contract;
An elastic member for biasing the retaining member toward the end of the joint body through the collar;
In a plug-in type pipe fitting comprising:
A restricting portion that is inserted into a gap between the end inner surface of the joint main body and the end outer surface of the collar, and restricts the radial movement of the collar;
A collar protecting portion provided so that the connecting pipe can be inserted, and having a guide hole for guiding insertion of the connecting pipe in a central axis direction of the joint body;
And a guide member fixed to the end portion of the joint body.

  In the plug-in pipe joint, the guide hole preferably has an inner diameter smaller than the inner diameter of the collar and larger than an outer diameter of the connection pipe.

According to the plug-in type pipe joint of the present invention, a restricting portion that is inserted into a gap between the end inner surface of the joint main body and the outer end surface of the collar and restricts the radial movement of the collar; A collar protecting portion that is provided so as to be inserted and has a guide hole that guides insertion of the connecting pipe in the central axis direction of the joint body, and includes a guide member that is fixed to the end of the joint body. The movement of the collar inside the joint is restricted, and the diagonal insertion of the connection pipe into the joint body is suppressed, and the connection pipe can be reliably connected with one-touch connection without causing problems caused by the radial movement of the collar. I can do it.

  Hereinafter, an insertion type pipe joint according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a plug-in type pipe joint according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the plug-in type pipe joint showing a state where the connection pipe is being inserted, and FIG. It is sectional drawing of the plug-in type pipe joint which shows the state after completion. The same parts as those in the prior art shown in FIG.

  As shown in FIG. 1, a pipe joint 1 includes a socket-shaped joint body 2, a seal member 3 that seals a connecting pipe (not shown) and the joint body 2, and a collar provided on one end side of the joint body 2. 4, a retaining member 5 held by the collar 4, an elastic member 6 interposed between the collar 4 and the seal member 3, and a guide member 7 provided at the end of the joint body 2. Yes.

The detail of each part which comprises the pipe joint 1 is as follows.
The joint body 2 is a hollow member penetrating in the central axis direction, and a first step portion 21 is formed therein. The first step portion 21 is formed with a large diameter portion 22 toward one end and a small diameter portion 23 toward the other end. The large-diameter portion 22 is formed with a second step portion 24 and a third step portion 25 so that the inner diameter gradually increases from the first step portion 21, and tapers from the third step portion toward the end portion. A tapered surface 26 is formed. Further, a male screw portion 27 connected to a female screw connection port (not shown) formed in another member is formed on the outer periphery of the end portion on the small diameter portion side of the joint body 2.

The seal member 3 is an elastic annular member including a base portion 31 and a lip portion 32 protruding from the base portion 31 toward the inner diameter side. The outer peripheral surface of the base portion is in close contact with the inner peripheral surface of the joint body. In this way, it is mounted on the back side of the second step portion 24. On the inner peripheral side of the seal member 3, a protective sleeve 8 having a peripheral groove 81 for accommodating the lip portion 32 is mounted. The protective sleeve 8 includes a guide portion 82 guided to the first step portion 21, a circumferential groove 81 that houses the lip portion 32 in a state before the connection pipe is inserted (a state before the diameter is expanded), and at the time of construction. A skirt portion 83 that covers the outer periphery of the end portion of the connecting pipe is provided.

The collar 4 is a cylindrical member having an inner diameter through which the connecting pipe can be inserted, and holding holes 41 that are retained without dropping a retaining member 5 to be described later on the inner diameter side. In the state where the retaining member 5 is held in the holding hole 41, the joint body 2 is mounted on the inner diameter side of the end portion. In the collar 4, a locking step 42 is formed on the outer periphery, and the locking step 42 is engaged with the locking ring 9 fitted in the groove 28 on the inner periphery of the end of the joint main body 2. It is attached to.

  The retaining member 5 is a member having a plurality of edge portions 51 a and 51 b on the inner peripheral surface and having a cross section formed in an arc shape (curved outward), and the edge portions 51 a and 51 b are formed from the inner peripheral surface of the collar 4. Plural pieces are attached along the circumferential direction so as to protrude (for example, at equal angular intervals).

  The elastic member 6 is a compression coil spring mounted between the spacer 10 having an L-shaped cross section that contacts the skirt portion 83 of the protective member 8 and the seat surface 43 formed at the joint back side end portion of the collar 4. Thus, the collar 4 is urged toward the joint end side.

  The guide member 7 includes a cylindrical regulating portion 71 inserted into a gap between the inner peripheral surface of the end portion of the joint body 2 and the outer peripheral surface of the end portion of the collar 4, and the outer side of the collar so as to protect the end portion of the collar 4. And a collar protector 72 provided on the right side in the drawing, and is attached to the end of the joint body 2. The guide member 7 is fixed by, for example, adhesion so as not to be easily detached from the end of the joint body 2.

  According to the plug-in pipe joint 1 described above, the plug-in pipe joint 1 shown in FIG. 1 in which all parts are assembled in the joint body 2 is prepared. The connection work with the connecting pipe 11 is completed simply by inserting 11 (for example, SUS304 steel pipe). The operation of each component at this time will be described in order.

  First, when the connecting pipe 11 is inserted from the end, the connecting pipe 11 passes through the guide hole 73 of the guide member 7 and is inserted into the collar. At this time, even if the connecting pipe 11 is inserted from an oblique direction with respect to the axis of the joint body 2, the guide member 7 is attached to the end of the joint body 2, and the collar moves in the radial direction. Since it is regulated by the regulation part 71, the collar 4 does not greatly tilt in the oblique direction like the plug-in type pipe joint 1a in FIG. As a result, the connection tube 11 is not properly inserted or the retaining member 5 is dropped from the collar 4 due to a malfunction of the retaining member 5 caused by the large inclination of the collar 4 that is conventionally seen when the tube is obliquely inserted. Is prevented. Further, since the end portion of the collar 4 is covered with the collar protection portion 72 provided with the guide hole 73 having a diameter smaller than the inner diameter thereof, a part of the end portion of the collar 4 is mistakenly formed at the end portion of the connecting pipe 11. It is possible to prevent the occurrence of a similar problem caused by pressing.

  When the connecting pipe 11 is inserted into the collar 4, the retaining member 5 expands while moving toward the joint back side against the urging force of the elastic member 6 along with the collar 4 and passes through the connecting pipe 11. Let

  The connecting pipe 11 that has passed through the retaining member 5 passes through the seal member 3 in a state where it passes through the spacer 10 and abuts against the abutting portion 84 of the protective member 8 and the outer periphery of the end portion is protected by the skirt portion 83. The protective member is inserted until the tip of the protective member comes into contact with the back of the first step portion 21. At this time, since the end portion of the connection pipe 11 is protected by the skirt portion 83, the seal member 3 is prevented from being damaged by the end portion of the connection pipe 11 coming into contact with the seal member 3. (See Figure 2)

  Further, when the insertion of the connecting pipe 11 is completed, the retaining member 5 is urged to the tapered surface 26 via the collar 4 by the elastic member 6, and the edge portions 51a and 51b are pressed against the outer peripheral surface of the connecting pipe. The connecting pipe 11 and the plug-in type pipe joint 1 are firmly connected. (See Figures 2 and 3)

  In the plug-type pipe joint 1 of the present invention, the material constituting each part may be appropriately set according to the use of the joint, the type of the connection pipe, etc. For example, a connection pipe made of austenitic stainless steel (SUS304) is used. In the case of a conventional hot water supply / hot water supply pipe, the joint body may be formed of a metal material having corrosion resistance such as stainless cast steel (SCS material). The locking ring and the compression coil spring may be formed of a metal material having corrosion resistance such as austenitic stainless steel (SUS304 or the like). In particular, the retaining member 8 is preferably formed of a material harder than the connecting pipe, for example, martensitic stainless steel (SUS420) when the connecting pipe is austenitic stainless steel (SUS304).

  Parts other than those described above do not require so much mechanical strength and can be formed of non-metallic materials such as polymer materials. The collar and guide member can be formed of general-purpose engineering plastics such as cross-linked polyethylene or special engineering plastics such as PPS (polyphenylene sulfide) having excellent heat resistance. As a material for the seal member, an elastic body, for example, an olefin rubber can be used. In particular, ethylene-propylene-diene rubber (EPDM) which is a terpolymer of ethylene, propylene and a diene monomer for crosslinking excellent in heat resistance is used. It is preferred to use. Further, it can be formed of FKM (fluoro rubber) having excellent heat resistance and chemical resistance. The protective sleeve can be formed of a general-purpose engineering plastic such as polyolefin.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. In the above embodiment, the restricting portion of the guide member is provided in a cylindrical shape, but the restricting portion is inserted into the gap between the inner peripheral surface of the end of the joint body and the outer peripheral surface of the collar to restrict the movement of the collar in the radial direction. For example, as shown in FIG. 4, a plurality of restricting pieces 71 a provided on the same circumference may be used. Further, the guide member is fixed to the joint body by, for example, forming a locking projection 74 on the restricting portion 71 as shown in FIG. 5 and engaging a locking recess (not shown) provided in a corresponding portion of the joint body. It can also be performed by locking the stop projection 74.

  Further, in the above embodiment, the plug-in type pipe joint that connects the connecting pipe to one port of the joint body is shown, but the socket type plug-in pipe joint that connects the connecting pipe to both ports, the elbow type plug-in type Of course, the present invention can also be applied to pipe joints and the like. Further, the connection pipe is not limited to a metal pipe such as a stainless steel pipe, but can be applied to a resin connection pipe, for example, a connection pipe made of vinyl chloride.

It is sectional drawing of the plug-in type pipe joint which concerns on embodiment of this invention. It is sectional drawing which shows the state which inserted the connection pipe to the insertion type pipe joint of FIG. It is sectional drawing which shows the state which inserted the connection pipe to the insertion type pipe joint of FIG. 1 to the insertion completion position. It is a half cutaway sectional view showing other forms of a guide member. It is a half cutaway sectional view showing other forms of a guide member. It is a half notch sectional view which shows the insertion type pipe joint of a prior art example. It is sectional drawing which shows the state by which the connection pipe was inserted in the diagonal direction in the plug-in type pipe joint of the prior art example.

1, 1a: Plug-in type pipe joint 2: Joint body, 21: First step portion, 22 large diameter portion, 23: Small diameter portion, 24: Second step portion, 25: Third step portion, 26: Tapered surface, 27: male screw part, 28: groove part 3: sealing member, 31: base part, 32: lip part 4: collar, 41: holding hole, 42: locking step part 5: retaining member, 51a, 51b: edge part 6 : Elastic member,
7, 7a, 7b: guide member, 71: restricting portion, 71a: restricting piece, 72: collar protecting portion, 73: guide hole, 74: locking projection 8: protecting member, 81: circumferential groove, 82: guide portion, 83: Skirt part 9: Locking ring 10: Spacer 11: Connection pipe

Claims (2)

A joint body having a receiving port for receiving the connecting pipe formed at the end;
A collar that is locked inside the receiving port, while holding the retaining member pressed against the outer surface of the connecting pipe so as to be able to expand and contract;
An elastic member for biasing the retaining member toward the end of the joint body through the collar;
In a plug-in type pipe fitting comprising:
A restricting portion that is inserted into a gap between the end inner surface of the joint main body and the end outer surface of the collar, and restricts the radial movement of the collar;
A collar protecting portion provided so that the connecting pipe can be inserted, and having a guide hole for guiding insertion of the connecting pipe in a central axis direction of the joint body;
And a guide member fixed to the end of the joint body. The plug-in type pipe joint according to claim 1, wherein the guide hole has an inner diameter smaller than an inner diameter of the collar and larger than an outer diameter of the connection pipe.

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