JP2012112451A - Insert-type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert-type pipe joint that can suppress a connecting pipe from being obliquely inserted into a joint body, can eliminate a connection malfunction caused by the extremely-oblique insertion of the connecting pipe, can surely connect the connecting pipe by one touch, and can easily release the connection of the connecting pipe.SOLUTION: The insert-type pipe joint 1 comprises the joint body 2, a collar 4 which holds a come-off prevention member and is attached into a receiving port, and a biasing member 6 which biases the collar toward the end side of the joint body. A guide member 7 having a regulation part 71 which is received in a space between the end internal periphery of the joint body and the end external periphery of the collar, and a collar protection part 72 which covers the end of the collar is firmly adhered to the end of the joint body, and an operation part 74 in at least one point is arranged at the guide member 7 so that the guide member can push in the collar 4 toward the depth side of the joint against a biasing force of the biasing member.

Description

  The present invention relates to an insertion-type pipe joint used for connecting a connection pipe such as a stainless steel pipe for water supply or hot water supply with a single 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 toward the tapered surface 26 formed on the inner surface of the receiving port by the elastic member 6 through the collar. The tip is pressed against the outer peripheral portion of the connecting pipe 11 to prevent the connecting pipe from being pulled out. 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 above-described conventional plug-in type pipe joint, the end of the collar 4 on the back side of the joint is only supported by the elastic member 6, so that the connecting pipe is extremely oblique to the axis of the joint. Is inserted, or when the end of the collar 4 is accidentally pushed at the end of the connecting tube, the collar 4 is greatly inclined inside the receiving port, so that the diameter expansion operation of the retaining member 5 is inhibited, There is a possibility that the one-touch connection of the connecting pipe cannot be performed (see FIG. 10). 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 to solve such problems, and its purpose is to prevent erroneous operation of the collar due to insertion of the connecting pipe from an oblique direction with respect to the joint, and to reliably connect the connecting pipe. An object of the present invention is to provide a plug-in pipe joint capable of performing one-touch connection.
Another object of the present invention is to provide a plug-in pipe joint that can easily release the connection between the joint and the connection pipe when the pipe must be disassembled after the construction. .

In order to achieve the above object, the plug-in type pipe joint of the present invention is
A joint body having a connection pipe receptacle and a seal member mounted thereon;
A retaining member that is locked to the connection pipe is held so that it can be expanded and contracted, and a collar that is mounted in the receiving port;
A biasing member that biases the collar toward the end side of the joint body;
A plug-in pipe fitting comprising:
A guide member having a regulating portion that fits in a gap between the inner periphery of the end portion of the joint body and the outer periphery of the end portion of the collar, and a collar protection portion that covers the end portion of the collar, is fixed to the end portion of the joint body,
The guide member is
At least one operation portion is provided so that the collar can be pushed toward the inner side of the joint against the urging force of the urging member from the outside of the joint.
According to this plug-in type pipe joint, since the restricting portion provided on the guide member is within the gap between the inner periphery of the end of the joint body and the outer periphery of the end of the collar, the operation of the collar inside the receiving port is restricted. The collar is prevented from being inclined obliquely inside the receptacle.
Moreover, since the collar protection part provided in the guide member covers the end of the collar, the end of the connection pipe does not come into contact with the end of the collar when the connection pipe is inserted into the joint. Therefore, malfunction due to the connection tube accidentally contacting the end portion of the collar and pressing the collar one side is prevented.
In addition, the guide member is provided with an operation part that allows the collar to be pushed in from the outside of the joint against the urging force of the urging member. After the piping work, an operation tool is inserted from the operation part and the collar is pushed inward. Thus, the connection between the plug-in type pipe joint and the connection pipe is released.
Thus, according to the plug-in type pipe joint of the present invention, the one-touch connection of the connecting pipe can be surely performed, and the connection between the plug-in type pipe joint and the connecting pipe is released after the pipe construction as necessary. Is possible.

Moreover, the plug-in type pipe joint of the present invention is the plug-in type pipe joint according to the above-mentioned plug-in type pipe joint, wherein the operation part is a through groove that penetrates the collar protection part from the outside of the guide member toward the end of the collar. It is characterized by being.
According to this plug-in type pipe joint, the operation part is a through-groove that penetrates from the outside of the guide member toward the collar, and an operation tool such as an elongated bar that manipulates the collar is inserted into the through-groove after piping construction. Is moved to the back side of the joint, the diameter of the retaining member is increased, and the connection between the connecting pipe and the joint is released. The through groove is not limited to a so-called “groove” in which a part of the guide hole inner surface of the guide member is cut as shown in FIG. 2 described later. It includes the form of a “through hole” provided so as to penetrate the protective part.

Moreover, the plug-in type pipe joint of the present invention is the above-described plug-type pipe joint, wherein the operation portion is a through groove formed in the collar protection portion from the outside of the guide member toward the end of the collar. Because
In the through groove, a partition wall that separates the inside and outside of the joint is removably provided.
According to this plug-in type fitting, the inside and outside of the joint are separated by a removable partition wall. Therefore, when disconnecting the connection pipe from the plug-in type pipe fitting after piping work, be sure to remove the partition wall. Accordingly, the plug-in pipe joint that has been disconnected even once has no partition. In other words, the presence or absence of the release history of the connecting pipe and the plug-in pipe joint can be confirmed by checking the presence or absence of the partition wall. That is, if there is a partition wall and the through-groove does not penetrate, it means an insertion-type pipe joint with no history of release in the past. If there is no partition wall and the through-groove penetrates, there is no history of release in the past. Means a plug-in fitting. The removal of the partition wall can be performed by a tool such as “Kiri”, or may be performed simultaneously with the operation of pushing the collar with the operation tool for pushing the collar. By doing so, it is possible to efficiently release the connection between the connection pipe and the plug-in pipe joint. In the present invention, the removal of the partition includes not only removing the partition completely, but also removing a part of the partition and deforming a part of the partition. For example, a form in which a hole is made in the partition wall by `` cutting '' or the like, and a through groove is communicated, or a form in which the through groove is communicated by pushing down the partition wall in a state where a part of the partition wall is pushed in and connected to the through groove, etc. Including.

Moreover, the plug-in type pipe joint of the present invention is characterized in that, in the plug-in type pipe joint, the partition wall is provided in the vicinity of the outer end portion of the through groove.
According to this plug-in type pipe joint, since the partition wall is provided in the vicinity of the outer end portion of the through groove, the presence or absence of the partition wall can be easily confirmed from the outside of the joint after pipe construction.

(First embodiment)
The plug-in type pipe joint according to the embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the plug-in pipe joint according to the first embodiment of the present invention, and FIG. 2 is a view in the direction of arrow A of the plug-in pipe joint (for ease of understanding, a guide member is attached). 3 is a cross-sectional view of the plug-in type pipe joint showing a state in which the connecting pipe is being inserted, and FIG. 4 is a plug-in type pipe joint showing the state after the connection pipe is completely inserted. FIG. 5 is a perspective view showing the operation tool, and FIG. 6 is a cross-sectional view showing a state in which connection between the plug-in type pipe joint and the connection pipe is released. The same parts as those of the conventional technique 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 of the joint body 2 on the small diameter portion side.

  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. A guide hole 73 having substantially the same diameter as the outer diameter of the connection pipe 11 is formed in the collar protection portion 72. As operation portions for operating the collar 4 from the outside of the built-in pipe joint 1, three through grooves 74 penetrating from the outside of the joint toward the collar 4 are provided. 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, and then the end of the joint body 2 on the receiving side Then, the connection work with the connection pipe 11 is completed simply by inserting the connection pipe 11 (for example, SUS304 steel pipe). Thereafter, by operating the collar 4 from the outside of the guide member 7, the connection between the joint and the connecting pipe is released. The operation of each component at this time will be described in order.

(Connection work)
First, when the connecting pipe 11 is inserted from the end on the receiving side, the connecting pipe 11 passes through the guide hole 73 of the guide member 7 and is inserted into the collar. At this time, since the guide hole 73 is formed to have an inner diameter substantially the same as the outer diameter of the connection pipe 11, the guide hole 73 guides the outer periphery of the connection pipe 11 so that the connection pipe 11 is straight along the axis of the joint. Since it is inserted, oblique insertion of the connecting pipe 11 is prevented. When the small diameter connecting pipe 11 is used within the crossing range, the connecting pipe 11 may be inserted from a slightly oblique direction with respect to the axial center of the joint body 2, but the guide member 7 is provided at the end of the joint body 2. Therefore, the movement of the collar in the radial direction is restricted by the restricting portion 71, and the collar 4 is not greatly inclined in the oblique direction like the plug-in pipe joint 1a of FIG. Therefore, conventionally, the insertion failure of the connection pipe 11 due to the malfunction of the retaining member 5, the dropout of the retaining member 5 from the collar 4, and the like caused when the collar 4 is largely inclined, which is seen when the tube is obliquely inserted, occur. 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 smaller diameter than the inner diameter, a part of the end portion of the collar 4 is mistaken at the end portion of the connecting pipe 11. It is possible to prevent the occurrence of the same problem caused by pushing the button.

  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 while passing 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 protection member 8 is inserted until the tip of the protection member 8 hits the back of the first step portion 21. At this time, since the end portion of the connecting pipe 11 is protected by the skirt portion 83, contact between the end portion of the connecting pipe 11 and the seal member 3 is prevented, and damage to the seal member 3 is prevented. (See Figure 3)

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

(Disconnect work)
The release operation of the plug-in type pipe joint 1 and the connection pipe 11 is performed using a release operation tool shown in FIG. The operation tool 12 includes a U-shaped base 121 and a protrusion 122 protruding from the base 121. The protrusion 122 is formed at a position corresponding to the through groove 74 formed in the guide member 7 fixed to the plug-type pipe joint end.
When releasing the connection between the connecting pipe 11 and the plug-in pipe joint 1 and pulling out the connecting pipe 11 from the plug-in pipe joint 1, first, the operation tool 12 is arranged so that the connecting pipe 11 comes inside the base 121. And it sets so that the protrusion part 122 may become a position which can be inserted in the penetration groove | channel 74. FIG. Next, the operating tool 12 is moved to the joint side so that the protrusion 122 passes through the through groove 74, and the protrusion 122 passes through the through groove 74 and reaches the end of the collar 4. When the operation tool 12 is further pushed, the collar 4 is pushed toward the joint back side against the urging force of the urging member 6. Then, when the retaining member 5 moves together with the collar 4 to the inner side of the joint, the retaining member 5 is released from restraint by the tapered inner surface 26 (see FIG. 6). In this state, the connecting pipe 11 is easily pulled out from the joint by being pulled to the opposite side of the plug-in pipe joint 1.

(Second Embodiment)
FIG. 7 is a cross-sectional view of the plug-in pipe joint according to the second embodiment of the present invention, and FIG. 8 is a view in the direction of the arrow A of the plug-in pipe joint (for ease of understanding, a guide member The display of the part excluding is omitted). In the present embodiment, since the portions other than the guide member are the same as the plug-in type pipe joint according to the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted. To do.

  The guide member 7B further includes a cylindrical regulating portion 71 inserted into a gap between the end inner peripheral surface of the joint body 2 and the end outer peripheral surface of the collar 4, and the collar 4 so as to protect the end of the collar 4. And a collar protection portion 72 provided on the outer side (right side in the figure), and is attached to the end of the joint body 2. A guide hole 73 having substantially the same diameter as the outer diameter of the connection pipe 11 is formed in the collar protection portion 72, and three locations are formed on the inner peripheral surface of the guide hole 73 from the outside of the joint toward the collar 4. A through groove 74B is provided. A partition wall 75 that separates the inside of the joint from the outside is provided near the end of the through groove 74B opposite to the joint. The guide member 7B is fixed by, for example, adhesion so as not to be easily detached from the end of the joint body 2.

(Connection work)
Since the connection work between the plug-in type pipe joint 1B and the connection pipe 11 and the operation of each member at the time of connection are the same as those of the plug-in type pipe joint according to the first embodiment, description thereof will be omitted.
(Disconnect work)
The release operation of the plug-in type pipe joint 1B and the connection pipe 11 is performed using the release operation tool shown in FIG. 5 as in the case of the plug-in type pipe joint according to the first embodiment. The operating tool 12 is set so that the connecting pipe 11 is inside the base 121 and the protrusion 122 is in a position where it can be inserted into the through groove 74B. Next, the operating tool 12 is moved to the joint side so as to pass through the through-groove 74B while removing the partition wall 75 by the projection 122, and the projection 122 reaches the end of the collar 4 through the through-groove 74B. To do. The subsequent operation is the same as that of the first embodiment, the connection between the plug-in type pipe joint 1B and the connection pipe 11 is released, and the connection pipe is pulled out.

  According to the plug-in type pipe joint according to the second embodiment, the partition 75 is surely removed by the operation tool 12 once the connection between the plug-in type pipe joint and the connection pipe is released. Therefore, by visually observing the plug-in type pipe joint from the outside after the pipe construction, and confirming the presence or absence of the partition wall of the guide member, it is possible to easily confirm the presence or absence of the past connection release history in the pipe construction pipe construction. . In other words, if there is a partition wall in the plug-in fitting after pipe construction, it means that the plug-in fitting has no history of release in the past, while if there is no partition, there is a history of release in the past. Means. Further, in order to ensure visual visibility, as shown in FIG. 7, it is desirable that the partition wall be provided in the vicinity of the end opposite to the joint side of the through groove of the guide member. You may provide so that it can identify easily with another part.

  In the plug-in type pipe joint 1B shown in FIG. 7, the partition wall 75 is integrally formed in the through groove 74B of the guide member 7B, but other forms may be used. The partition wall can be used to separate the inside and outside of the plug-in pipe joint until the connection between the plug-in pipe joint and the connecting pipe is released by the operating tool, and it is only necessary to be removed after the release. Specifically, the partition may be a separate member formed of resin or the like that fits inside the through groove 74 of the guide member 7 shown in the first embodiment.

  In the plug-in type pipe joint 1, 1B 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, and the like. For example, the connection pipe made of austenitic stainless steel (SUS304) In the case of a hot water / hot water supply pipe using, 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.

  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 connecting pipe is not limited to a metal pipe such as a stainless steel pipe, but can be applied to a connecting pipe made of resin, for example, a connecting pipe made of vinyl chloride.

It is sectional drawing of the plug-in type pipe joint which concerns on the 1st Embodiment of this invention. It is an A direction arrow directional view of the plug-in 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. 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 perspective view which shows an operation tool. It is sectional drawing which shows the state of the connection cancellation | release of the plug-in type pipe joint and connecting pipe of FIG. It is sectional drawing of the plug-in type pipe joint which concerns on the 2nd Embodiment of this invention. It is an A direction arrow directional view of the plug-in type pipe joint of FIG. 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, 1B: 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, 7B: guide member, 71: restricting portion, 72: collar protecting portion, 73: guide hole, 74: through groove, 74B: through groove, 75: partition wall 8: protecting member, 81: circumferential groove, 82: guide portion 83: Skirt part 9: Locking ring 10: Spacer 11: Connection pipe 12: Operation tool 121: Base part 122: Projection part

Claims (5)

A joint body having a connection pipe receptacle and a seal member mounted thereon;
A retaining member that is locked to the connection pipe is held so that it can be expanded and contracted, and a collar that is mounted in the receiving port;
A biasing member that biases the collar toward the end side of the joint body;
A plug-in pipe fitting comprising:
A guide member having a regulating portion that fits in a gap between the inner periphery of the end portion of the joint body and the outer periphery of the end portion of the collar, and a collar protection portion that covers the end portion of the collar, is fixed to the end portion of the joint body,
The guide member is
At least one operation part is provided so that the said collar can be pushed in against the urging | biasing force of the said urging | biasing member toward the joint inner side from the coupling exterior, The insertion type pipe coupling characterized by the above-mentioned. 2. The plug-in type pipe joint according to claim 1, wherein the operation portion is a through groove that penetrates the collar protection portion from the outside of the guide member toward an end portion of the collar. The operation part is a through groove formed in the collar protection part from the outside of the guide member toward the end of the collar,
The plug-in type pipe joint according to claim 1, wherein a partition wall separating the inside and outside of the joint is provided in the through groove so as to be removable. The plug-in type pipe joint according to claim 3, wherein the partition wall is provided in the vicinity of an outer end portion of the through groove. 5. The plug-in type pipe joint according to claim 3, wherein the partition wall is removed simultaneously with the pressing of the collar by the operation tool inserted from the through groove.

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