JP2012047270A - Insertion type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the possibility that a joint pipe is jointed in an inclined posture.SOLUTION: The insertion type pipe joint 20 includes a joint body 30, a disconnection prevention member 34, a cylindrical retaining member 36, a fall prevention member 32, an elastic member 38, a support member 40 and packing 44. The joint body 30 has a receiving port 60. The disconnection prevention member 34 is engaged with the outer circumferential surface of a joint pipe when the end part of the joint pipe is inserted in the joint body 30. The retaining member 36 retains the disconnection prevention member 34. The fall prevention member 32 prevents the retaining member 36 from being removed and fallen out of the joint body 30. The packing 44 closely contacts with the outer circumferential surface of the joint pipe. The joint body 30 is formed inside with a tapered surface 64. The elastic member 38 presses the disconnection prevention member 34 against the tapered surface 64. The support member 40 supports the elastic member 38. A part of the fall prevention member 32 through which the joint pipe passes has an inner diameter larger than the outer diameter of the joint pipe and not more than the diameter of the admission port 450 in the support member 40.

Description

  The present invention relates to a plug-in type pipe joint, and more particularly, to a plug-in type pipe joint that can reduce the possibility of connecting pipes including a stainless steel pipe for water supply and a stainless steel pipe for hot water supply in an obliquely inclined posture.

  Patent document 1 is disclosing the invention concerning a plug-in type pipe joint. The plug-in type pipe joint includes a joint body. The joint body has a receiving port at least at one end. The receiving port receives the end of the connecting pipe. A tapered surface is provided on the inner periphery of the receiving portion. The tapered surface gradually narrows toward the upstream side in the connecting pipe insertion direction. The joint body accommodates a retaining member, a holding member that holds the retaining member, an elastic member, an annular spacer, and a packing. The retaining member is housed inside the joint body. When the end of the connection pipe is inserted into the joint body, the retaining member is engaged with the outer peripheral surface of the connection pipe. Thereby, the retaining member prevents the connecting pipe from coming off from the joint body. The elastic member presses the retaining member together with the holding member toward the tapered surface. The spacer holds the downstream end of the elastic member in the connecting pipe insertion direction. The packing is in close contact with the outer peripheral surface of the connecting pipe. The packing includes an annular portion and a lip portion that protrudes radially inward from the inner periphery of the annular portion. The downstream end face of the spacer in the connecting pipe insertion direction is in contact with the upstream end of the annular part in the connecting pipe insertion direction. A tapered surface that gradually narrows toward the downstream side in the connecting tube insertion direction is formed on this end surface of the spacer.

  According to the plug-in type pipe joint disclosed in Patent Document 1, it is possible to improve the sealing performance by packing and prevent water leakage.

JP 2010-65745 A

  In many cases, in the plug-in type pipe joint disclosed in Patent Document 1, when the connection pipe is inserted into the joint body with the center axis of the connection pipe inclined with respect to the center axis of the joint body, Notice that. When the connecting pipe is inserted in such a way, compared to when the connecting pipe is inserted into the joint body so that the central axis of the joint body and the central axis of the connecting pipe are almost parallel, This is because the resistance felt by the person is large. However, when the connecting pipe has to be inserted into the plug-in fitting with a posture different from usual, for example, the hand is forcibly extended, it is difficult for the operator to feel the difference in resistance from usual. This is because it is difficult to use the resistance usually felt as a reference. Since it is difficult to sense the difference in resistance, even if the connecting pipe is inserted into the joint body in a state where the central axis of the connecting pipe is inclined with respect to the central axis of the joint body, it is difficult for the operator to notice that. In addition, for various reasons, the operator may not be aware that the connecting pipe has been inserted into the joint body with the central axis of the connecting pipe inclined with respect to the central axis of the joint body. In the following description, the fact that the central axis of the connecting pipe is inclined with respect to the central axis of the joint body is referred to as “inclined obliquely”.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a plug-in pipe joint that can reduce the possibility that the connecting pipe is connected in an obliquely inclined posture. It is to provide.

  In order to achieve the above object, according to an aspect of the present invention, the plug-in type pipe joint 20 includes a joint body 30, a retaining member 34, a cylindrical holding member 36, a drop-off preventing member 32, and a packing. 44. The joint body 30 has a receiving port 60 at least at one end. The receiving port 60 receives the end of the connecting pipe 100. The retaining member 34 is housed inside the joint body 30. The retaining member 34 is engaged with the outer peripheral surface of the connection pipe 100 when the end of the connection pipe 100 is inserted into the joint body 30. The retaining member 34 prevents the connecting pipe 100 from coming off the joint body 30. The holding member 36 is accommodated in the joint body 30. The connecting pipe 100 penetrates the holding member 36. The holding member 36 holds the retaining member 34. The drop prevention member 32 is arranged on the receiving port 60 side of the holding member 36 in the joint body 30. The connecting pipe 100 penetrates the drop prevention member 32. The drop prevention member 32 prevents the holding member 36 from falling out of the joint body 30. The packing 44 is accommodated in the interior of the joint body 30 at a position behind the holding member 36 when viewed from the receiving port 60. The connecting pipe 100 passes through the packing 44. The packing 44 is in close contact with the outer peripheral surface of the connecting pipe 100. An inner circumferential groove 62 and a tapered surface 64 are formed inside the joint body 30. The tapered surface 64 becomes narrower as it approaches the receiving port 60. The plug-in type pipe joint 20 further includes an elastic member 38 and a support member 40. The elastic member 38 is accommodated in the interior of the joint body 30 at a position behind the holding member 36 when viewed from the receiving port 60. The elastic member 38 presses the retaining member 34 against the tapered surface 64 inside the joint body 30. The support member 40 supports the elastic member 38. The connecting pipe 100 passes through the support member 40. The holding member 36 is movable while holding the retaining member 34 inside the joint body 30. The inner diameter of the part through which the connecting pipe 100 penetrates in the dropout preventing member 32 is larger than the outer diameter of the connecting pipe 100.

  It is desirable that the inner diameter of the portion through which the connection pipe 100 penetrates in the above-described drop prevention member 32 is equal to or smaller than the diameter of the entrance 450 of the connection pipe 100 in the support member 40.

  The connecting pipe 100 passes through the drop-off preventing member 32 and the holding member 36 in sequence, whereby the inclination of the connecting pipe 100 is corrected. If the inner diameter of the portion (through portion) through which the connecting pipe 100 penetrates in the dropout prevention member 32 is larger than the outer diameter of the connecting pipe 100 and not more than the diameter of the entrance 450, the joint is inclined obliquely. The possibility that the distal end of the connection pipe 100 that has passed through the holding member 36 and hit the edge of the entrance 450 to be inserted into the main body 30 continues to press the support member 40 as it is is that the inside diameter of the above-described penetration portion is the entrance. It becomes lower than the case of exceeding the diameter of 450. Further, when the inner diameter of the penetrating portion is equal to or smaller than the diameter of the entrance port 450, the tip of the connection pipe 100 is disengaged from the edge of the entrance port 450 of the support member 40 as compared with the case where the inner diameter of the penetrating portion is larger than the diameter of the entrance port 450. The possibility of proceeding through the support member 40 is increased. As a result, when the connection pipe 100 enters the inside of the joint main body 30 in an obliquely inclined posture, the holding member 36 can be moved while holding the retaining member 34 inside the joint main body 30. Even if it does not become a barrier, the possibility that the connecting pipe 100 is connected in an obliquely inclined posture can be reduced.

  Further, it is desirable that the above-described drop prevention member 32 has an annular portion 322 and a protrusion 324. In this case, the connecting pipe 100 penetrates the annular portion 322. The annular portion 322 is exposed when viewed from the outside of the joint body 30. The protrusion 324 fits in the inner circumferential groove 62 inside the joint body 30. The inner diameter of the annular portion 322 is larger than the outer diameter of the connection pipe 100 and is equal to or smaller than the diameter of the entrance 450. The width of the protrusion 324 in the direction toward the back of the joint body 30 when viewed from the receiving port 60 is smaller than the width of the inner peripheral groove 62 in the direction toward the back of the joint body 30 when viewed from the reception port 60.

  The annular portion 322 is exposed when viewed from the outside of the joint body 30. The width of the protrusion 324 in the direction toward the back of the joint body 30 when viewed from the receiving port 60 is smaller than the width of the inner peripheral groove 62 in the same direction. For this reason, when the annular portion 322 is pushed from the outside of the joint body 30, the drop-off prevention member 32 moves toward the back of the joint body 30 as viewed from the receiving port 60. When the drop prevention member 32 moves in the direction toward the back of the joint body 30 as viewed from the receiving port 60, the holding member 36 that contacts the drop prevention member 32 also moves in the same direction against the force of the elastic member 38. When the holding member 36 moves in this way, the retaining member 34 moves away from the tapered surface 64. When the retaining member 34 is separated from the tapered surface 64, the engagement with the outer peripheral surface of the connection pipe 100 is released. As a result, not only can the connection pipe 100 be less likely to be connected in an obliquely inclined posture, but the connection pipe 100 can be easily pulled out from the joint body 30. In addition, since the inner diameter of the annular portion 322 is larger than the outer diameter of the connection pipe 100 and not more than the diameter of the entrance 450, the holding member 36 is blocked by the annular portion 322 and does not fall out of the joint body 30.

  According to the present invention, it is possible to reduce the possibility that the connecting pipe is connected in an obliquely inclined posture.

It is sectional drawing which shows the plug-in type pipe joint concerning one Example of this invention. It is a perspective view which shows the drop-off prevention member of the plug-in type pipe joint. It is a perspective view which shows the holding member of the plug-in type pipe joint. It is a perspective view which shows the damage prevention sleeve of the same insertion type pipe joint. It is sectional drawing of the plug-in type pipe joint which is inserting the connection pipe. It is sectional drawing of the same insertion-type pipe joint when insertion of a connecting pipe is completed. It is sectional drawing expanded about the receiving part vicinity of the coupling main body concerning the modification of this invention. It is a perspective view which shows the drop prevention member concerning the 1st modification of this invention. It is a perspective view which shows the drop prevention member concerning the 2nd modification of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[Description of structure]
As shown in FIG. 1, the plug-in type pipe joint 20 according to one embodiment of the present invention includes a joint body 30, a drop prevention member 32, a removal member 34, a holding member 36, an elastic member 38, A support member 40, an anti-scratch sleeve 42, and a packing 44 are provided.

  The joint body 30 has a cylindrical shape with both ends opened. The joint body 30 is manufactured using a precision casting technique or the like. The joint body 30 is preferably made of a material having excellent corrosion resistance and rigidity. Examples of materials having excellent corrosion resistance and rigidity are SCS (Steel Casting Stainless) defined in JIS (Japanese Industrial Standards) and bronze materials.

  The joint body 30 includes a receiving port 60, an inner circumferential groove 62, a tapered surface 64, a receiving side stepped portion 66, a pre-insertion receiving portion 68, an intermediate stepped portion 70, and a post-insertion receiving portion 72. , A flow path side step 74, a flow path 76, and a connecting male screw 78.

  The receiving port 60 is formed at one end of the joint body 30 in the axial direction. The end of the connecting pipe 100 is inserted into the receiving port 60. The inner circumferential groove 62 is provided at the back of the receiving port 60. The inner circumferential groove 62 is provided so as to surround the connecting pipe 100 when the end of the connecting pipe 100 is inserted into the joint body 30. A tapered surface 64 is provided behind the inner circumferential groove 62 when viewed from the receiving port 60. The taper surface 64 widens as the distance from the receiving port 60 increases. In other words, the tapered surface 64 narrows as it approaches the receiving port 60. The receiving side stepped portion 66 is a step provided at the back of the tapered surface 64 when viewed from the receiving port 60. The pre-insertion accommodating portion 68 is provided at the back of the receiving side stepped portion 66 when viewed from the receiving port 60. Before the end portion of the connection pipe 100 is inserted into the joint body 30, the support member 40, the scratch prevention sleeve 42, and the packing 44 are accommodated in the pre-insertion accommodation portion 68. The intermediate step portion 70 is a step provided at the boundary between the pre-insertion storage portion 68 and the post-insertion storage portion 72. The post-insertion accommodating portion 72 is provided in the back of the stepped portion 70 when viewed from the receiving port 60. The inner diameter of the accommodating part 72 after insertion is smaller than the inner diameter of the accommodating part 68 before insertion. After the end of the connecting pipe 100 is inserted into the joint body 30, the damage preventing sleeve 42 is accommodated in the after-insertion accommodating portion 72. The flow path side stepped portion 74 is a step provided at the boundary between the accommodation portion 72 and the flow channel 76 after insertion. The flow channel 76 is provided in the back of the flow channel side stepped portion 74 when viewed from the receiving port 60. The flow path 76 has an inner diameter smaller than that of the accommodating portion 72 after insertion. The connecting male screw 78 is formed on the outer peripheral surface of one end portion in the axial direction on the same side as the flow path 76 in the joint body 30.

  The drop prevention member 32 will be described with reference to FIGS. 1 and 2. The drop prevention member 32 is a member for preventing the holding member 36 from being pulled out from the joint body 30. The drop prevention member 32 can be formed of austenitic stainless steel (for example, SUS304 defined in JIS). As is clear from FIG. 1, the drop-off prevention member 32 is disposed closer to the receiving port 60 than the holding member 36. In order to accommodate the drop prevention member 32 in the joint body 30, the drop prevention member 32 is pushed from the receiving port 60. As a result, the drop prevention member 32 is elastically deformed and enters the joint body 30.

  The drop prevention member 32 has a cylindrical portion 320, an annular portion 322, and a protrusion 324. As shown in FIG. 1, one end of the holding member 36 is fitted into the cylindrical portion 320. Further, the connecting pipe 100 passes through the cylindrical portion 320. The annular portion 322 is provided so as to protrude from the inner peripheral surface of the cylindrical portion 320. The connecting pipe 100 also penetrates the annular portion 322. As shown in FIG. 1, the annular portion 322 is exposed when viewed from the outside of the joint body 30. The inner diameter of the annular portion 322 is preferably larger than the outer diameter of the connection pipe 100 and not more than the diameter of the entrance 450 (see FIG. 1) in the support member 40. In this embodiment, when the edge of the entrance 450 is chamfered, the diameter of the entrance 450 means a portion having the largest inner diameter among the chamfered edges. When the entrance 450 is not chamfered, the diameter of the entrance 450 is equal to the inner diameter of the support member 40. Incidentally, to describe the present embodiment more precisely, the inner diameter of the annular portion 322 is equal to the diameter of the entrance 450. The protrusion 324 is provided at one end of the cylindrical portion 320 that is opposite to the annular portion 322. The protrusion 324 projects from the outer peripheral surface of the cylindrical portion 320. The protrusion 324 fits in the inner circumferential groove 62 of the joint body 30. When the holding member 36 that has entered the cylindrical portion 320 with the protrusion 324 fitted in the inner circumferential groove 62 hits the annular portion 322, the holding member 36 is prevented from falling off the joint body 30. As is clear from FIG. 1, in the case of this embodiment, the width of the protrusion 324 in the direction from the receiving port 60 to the back of the joint body 30 is the inner circumference in the direction from the receiving port 60 to the back of the joint body 30. It is smaller than the width of the groove 62. Thereby, the drop-off prevention member 32 can move in a direction from the receiving port 60 toward the back of the joint body 30.

  The retaining member 34 will be described with reference to FIG. The retaining member 34 is housed inside the joint body 30. The material of the retaining member 34 is a material harder than the connecting pipe 100. For example, if the connecting pipe 100 is austenitic stainless steel (SUS304), the material of the retaining member 34 may be martensitic stainless steel (for example, SUS420 defined in JIS). A plurality (two in the illustrated example) of teeth 340 are formed on the side surface of the retaining member 34 that faces the connecting pipe 100. When the retaining member 34 is pressed against the tapered surface 64 of the joint body 30 and the teeth 340 bite into the outer peripheral surface of the connection pipe 100, the connection pipe 100 is prevented from coming off from the joint body 30.

  The holding member 36 will be described with reference to FIG. As shown in FIG. 3, the holding member 36 according to the present embodiment is cylindrical. A central portion of the holding member 36 according to the present embodiment (a portion provided with a holding hole 360 described later) is thick. The holding member 36 is accommodated in the joint body 30. The holding member 36 holds the retaining member 34 described above. Further, the connecting pipe 100 penetrates the holding member 36. The holding member 36 is formed of engineering plastics including crosslinked polyethylene and PPS (polyphenylene sulfide). The latter is preferable as a material for the holding member 36 because it has excellent heat resistance. The holding member 36 has a plurality of holding holes 360 at predetermined intervals in the circumferential direction. In the present embodiment, the number of holding holes 360 is six. The retaining member 34 described above is fitted into each holding hole 360 one by one.

  The elastic member 38 will be described with reference to FIG. 1 again. The elastic member 38 presses the retaining member 34 together with the holding member 36 toward the tapered surface 64 in the joint body 30. If the elastic member 38 in a present Example is demonstrated more concretely, the elastic member 38 is implement | achieved by the compression coil spring. When a compression coil spring is used as the elastic member 38, this member can be formed of, for example, austenitic stainless steel (SUS304). An end portion on the receiving port 60 side of the elastic member 38 is hooked on a stepped portion 362 on the flow channel 76 side of the holding member 36. The end of the elastic member 38 on the flow path 76 side is hooked on the support member 40.

  The support member 40 is disposed adjacent to the packing 44. The cross section of the support member 40 is L-shaped. The support member 40 has a stepped portion 400. The end of the elastic member 38 on the channel 76 side is hooked on the stepped portion 400. The support member 40 supports the elastic member 38. The connecting pipe 100 passes through the support member 40. The connecting pipe 100 enters the support member 40 from the entrance 450.

  The damage prevention sleeve 42 will be described with reference to FIG. The scratch prevention sleeve 42 is made of plastic or metal. An example of plastic in this case is polypropylene. The inner diameter of the damage prevention sleeve 42 is equal to or smaller than the inner diameter of the connection pipe 100. The scratch-preventing sleeve 42 has a packing holding cylindrical portion 420 and a thin tube end receiving cylindrical portion 422. The outer diameter of the packing holding cylinder portion 420 is smaller than the inner diameter of the accommodating portion 72 after insertion of the joint body 30. The tube end receiving tubular portion 422 is integrally connected to the packing holding tubular portion 420. The inner diameter of the tube end receiving tubular portion 422 is formed to be larger than the outer diameter of the connection tube 100. Thereby, the pipe end receiving cylindrical part 422 can be fitted to the outside of the end of the connection pipe 100. A step portion 424 is formed between the inner peripheral surface of the packing holding cylindrical portion 420 and the inner peripheral surface of the tube end receiving cylindrical portion 422. The end of the connecting pipe 100 hits the stepped portion 424. A groove 430 having a V-shaped cross section is formed on the outer periphery of the packing holding cylinder 420. A part of the packing 44 is fitted into the concave groove 430. The rear end portion 432 of the tube end receiving cylindrical portion 422 is formed in a trumpet shape. Thus, when the connection pipe 100 is inserted, the end of the connection pipe 100 is smoothly inserted without being caught by the rear end portion 432 of the pipe end receiving cylindrical portion 422. The tube end receiving cylindrical portion 422 is provided with slits 434 at predetermined intervals in the circumferential direction.

  The packing 44 will be described with reference to FIG. 1 again. The packing 44 is formed to be elastically deformable by using a rubber packing or the like as a material. As shown in FIG. 1, the packing 44 has a cylindrical portion 440 and an annular lip portion 442. The lip portion 442 projects from the inner periphery of the tubular portion 440 toward the center of the tubular portion 440. The lip portion 442 is elastically deformable. When no load is applied to the lip 442, the inner diameter is smaller than the outer diameter of the connection pipe 100. The packing 44 is disposed in the pre-insertion accommodating portion 68 of the joint body 30.

[Description of connection procedure]
Next, the connection procedure of the connection pipe 100 by the plug-in type pipe joint 20 described above will be described with reference to FIGS. 5 and 6.

  First, the operator inserts the connection pipe 100 into the receiving port 60 of the joint body 30 and penetrates the drop prevention member 32. FIG. 5 shows a situation in which the distal end portion of the connecting pipe 100 reaches the vicinity of the scratch preventing sleeve 42. When the operator inserts the connecting pipe 100 into the tube end receiving tubular portion 422 after the connecting pipe 100 is inserted, if the operator further pushes the connecting pipe 100, the tip of the connecting pipe 100 is damaged. It contacts the step 424 in the prevention sleeve 42. As the connecting pipe 100 is pushed in, the retaining member 34 moves inward of the joint body 30. The “inner direction” referred to in the present embodiment is a direction from the receiving port 60 toward the flow path 76. During the movement of the retaining member 34, the teeth 340 come into contact with the outer peripheral surface of the connection pipe 100. Even if an external force is applied in the direction in which the connecting pipe 100 is pulled out in this state, the retaining member 34 contacts the tapered surface 64 and the teeth 340 bite into the outer peripheral surface of the connecting pipe 100, so that the connecting pipe 100 does not come off. .

  When the connecting pipe 100 is inserted, the scratch preventing sleeve 42 is interposed between the packing 44 and the end of the connecting pipe 100. In this state, the end face at the end of the connecting pipe 100 is not in contact with the packing 44. Therefore, even if an outer edge is generated on the end face of the terminal end of the connecting pipe 100, the packing 44 is not damaged by the outer edge. Therefore, water leakage due to damage of the packing 44 does not occur.

  When the operator inserts the connection pipe 100 further deeply, the connection pipe 100 pushes the scratch-preventing sleeve 42 inward of the joint body 30 rather than the packing 44. Thereby, the packing holding cylinder portion 420 of the scratch preventing sleeve 42 contacts the flow path side step portion 74 in the joint body 30. In this process, the scratch preventing sleeve 42 moves while deforming the lip portion 442 of the packing 44 in the inner direction of the joint body 30. As a result of the movement, the scratch preventing sleeve 42 is detached from the packing 44. In the state where the insertion of the connecting pipe 100 is completed as shown in FIG. 6, the lip portion 442 of the packing 44 is in close contact with the outer peripheral surface of the connecting pipe 100. Thereby, the state which seals between the outer peripheral surface of the connection pipe 100 and the accommodating part 68 before insertion of the coupling main body 30 is obtained. Furthermore, a retaining state in which the teeth 340 of the retaining member 34 bite into the outer peripheral surface of the connecting pipe 100 is obtained.

  After the connection pipe 100 is completely inserted, when the connection pipe 100 is pulled in the extraction direction, the outer peripheral portion of the retaining member 34 corresponds to the constricted side of the tapered surface 64. This is because the retaining member 34 accompanies the connecting pipe 100. As a result, the retaining member 34 is narrowed. When the retaining member 34 is narrowed, the teeth 340 are engaged with the outer peripheral surface of the connecting pipe 100. Thereby, it is possible to prevent the connecting pipe 100 from coming off the joint body 30.

[Description of the effect of the plug-in type pipe joint according to this embodiment]
It is assumed that the connecting pipe 100 is inserted into the joint body 30 while being inclined at an angle. As described above, the inner diameter of the annular portion 322 according to this embodiment is equal to the diameter of the entrance 450 of the support member 40. For this reason, even if the connecting pipe 100 is slightly inclined, the tip of the connecting pipe 100 abuts against the edge of the entrance 450, so that it does not move further inwardly of the joint body 30 unless it deviates from the edge of the entrance 450. Not proceed. Therefore, when the connection with the plug-in type pipe joint 20 is completed, the inclination of the center axis of the connection pipe 100 with respect to the center axis of the joint body 30 is considerably small.

  Furthermore, in the case of the present embodiment, one end of the holding member 36 is fitted into the cylindrical portion 320. The cylindrical portion 320 is supported on the inner peripheral surface of the joint body 30. Accordingly, the movement of the holding member 36 such that the central axis of the joint body 30 and the central axis of the holding member 36 obliquely intersect with each other is limited by the cylindrical portion 320. Since the connecting pipe 100 penetrates the holding member 36 following the annular portion 322, the movement of the holding member 36 is restricted, so that the movement of the connecting pipe 100 that is inclined with respect to the central axis of the joint body 30 is also restricted. The Rukoto. As a result, the plug-in-type pipe joint 20 according to the present embodiment can reduce the possibility that the connecting pipe 100 is connected to the joint body 30 in an inclined posture.

  Further, the annular portion 322 is exposed when viewed from the outside of the joint body 30, and the retaining member 34, the holding member 36, and the drop-off preventing member 32 move toward the back of the joint body 30 when viewed from the receiving port 60. it can. Thereby, the retaining member 34 is separated from the tapered surface 64, and the engagement between the outer peripheral surface of the connecting pipe 100 and the retaining member 34 can be released. Since the engagement can be released, the connecting pipe 100 can be easily removed from the joint body 30.

[Description of modification]
The embodiments disclosed herein are illustrative in all respects. The scope of the present invention is not limited based on the above-described embodiment, and various design changes may be made without departing from the spirit of the present invention.

  For example, in the said Example, although the plug-in type pipe joint 20 which formed the external thread 78 for a connection in the one side of the coupling main body 30 was described, this invention is not limited to this. For example, the present invention can of course be applied to symmetrical socket-type plug fittings and elbow-type plug fittings. Further, the connecting pipe 100 is not limited to a metal pipe such as a stainless steel pipe. The connecting pipe 100 can also be applied to connecting pipes made of vinyl chloride or other synthetic resins.

  Further, the inner circumferential groove 62 and the tapered surface 64 described above may be integrated. FIG. 7 is an enlarged view showing a cross section of such a joint body 130. In the joint main body 130, an inner circumferential groove 162 and a tapered surface 164 are integrated.

  Further, the structure of the dropout prevention member is not limited to the above-described one. FIG. 8 is a perspective view showing a drop prevention member 33 having a structure different from that of the drop prevention member 32 described above. The drop prevention member 33 includes a cylindrical portion 330, an annular portion 332, and a protrusion 334. A slit 336 is provided from the cylindrical portion 330 to the protrusion 334. Thereby, it becomes easy to insert the drop preventing member 33 into the joint body 30.

  FIG. 9 is a perspective view showing a drop prevention member 35 having a structure different from that of the drop prevention member 32 and the drop prevention member 33. The dropout prevention member 35 is provided with a notch 326 extending from the cylindrical portion 320 to the protrusion 324. The other points are the same as the dropout prevention member 32. By providing the notch 326, it becomes easy to insert the drop-off preventing member 35 inside the joint body 30.

  Further, the drop-off preventing member may be a disc having a round hole in the middle. In this case, the inner diameter of the middle hole is preferably larger than the outer diameter of the connection pipe 100 and not more than the diameter of the entrance 450 in the support member 40. Furthermore, it is desirable that a part of the edge of the center hole is cut away. This is because the notched portion can be used as a tool entry path.

  The annular portion 322 may not protrude from the end of the joint body 30 to the outside of the joint body 30. The annular portion 322 only needs to be exposed from the outside of the joint body 30, that is, visible to the human eye from the outside of the joint body 30. Therefore, for example, the annular portion 322 may be in the joint body 30 but can be seen by human eyes when looking into the joint body 30 from the receiving port 60.

20 Plug-in type pipe joints 30 and 130 Joint main bodies 32, 33 and 35 Drop-off prevention member 34 Stop-off member 36 Holding member 38 Elastic member 40 Support member 42 Prevention sleeve 44 Packing 60 Receptacle 62 and 162 Inner peripheral grooves 64 and 164 Taper Surface 66 Receiving side step portion 68 Pre-insertion accommodating portion 70 Intermediate step portion 72 After insertion portion 74 Flow passage side step portion 76 Channel 100 Connection pipe 320, 330, 422, 440 Cylindrical portion 322, 332 Annular portion 324 , 334 Protrusion 326 Notch 336, 434 Slit 340 Teeth 360 Holding hole 362, 400, 424 Step part 420 Packing holding cylinder part 430 Recessed groove 432 Rear end part 442 Lip part 450 Entrance

Claims (3)

A joint body having a receiving port for receiving the end of the connecting pipe at least at one end;
It is housed inside the joint body, and when the end of the connection pipe is inserted into the joint body, it is engaged with the outer peripheral surface of the connection pipe, and the connection pipe is prevented from coming off from the joint body. A retaining member to be
A cylindrical holding member that is housed inside the joint body, penetrates the connecting pipe, and holds the retaining member;
A drop-out preventing member that is disposed on the receiving side from the holding member in the inside of the joint body, the connection pipe penetrates, and the holding member is prevented from falling out of the joint body.
A packing housed in a position deeper than the holding member as seen from the receiving port inside the joint body, the connecting pipe penetrating therethrough, and tightly contacting an outer peripheral surface of the connecting pipe;
An inner circumferential groove and a tapered surface are formed inside the joint body,
The tapered surface narrows as it approaches the receiving port,
The plug-in fitting is
An elastic member that is housed in a position deeper than the holding member when viewed from the receiving port inside the joint body, and that presses the retaining member against a tapered surface inside the joint body;
A support member that supports the elastic member and through which the connecting pipe passes,
In the plug-in type pipe joint in which the holding member is movable while holding the retaining member inside the joint body,
The plug-in type pipe joint, wherein an inner diameter of a part through which the connection pipe penetrates is larger than an outer diameter of the connection pipe.   2. The plug-in type pipe joint according to claim 1, wherein an inner diameter of a part of the drop-out preventing member through which the connection pipe passes is equal to or less than a diameter of an entrance of the connection pipe in the support member. . The drop prevention member is
An annular portion that penetrates the connecting pipe and is exposed when viewed from the outside of the joint body; and
A projection that fits into the inner circumferential groove inside the joint body;
An inner diameter of the annular portion is larger than an outer diameter of the connecting pipe and not more than a diameter of the entrance;
The width of the projection in the direction toward the back of the joint body as viewed from the receiving port is smaller than the width of the inner circumferential groove in the direction toward the back of the joint body as viewed from the receiving port. 2. Plug-in type pipe joint according to 2.

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