JP5314896B2 - Plug-in fittings - Google Patents

Description

  The present invention relates to a plug-in type fitting that is used for hot water supply / water supply piping, etc., and can be connected in a seal shape by simply inserting a connecting pipe, and more specifically, when a connecting pipe is inserted, a packing fitting in the pipe fitting is fitted. The present invention relates to an insertion-type pipe joint that can prevent the packing fitted in the groove from being pushed out of the packing fitting groove at the end face of the connecting pipe.

  As this type of plug-in type pipe joint, for example, those shown in FIGS. 9 to 11 are known (see, for example, Patent Document 1). The plug-in type pipe joint is provided with an inner cylinder 31 into which the end of the connecting pipe P is inserted into an outer fitting shape inside the joint body 30, and an annular packing fitting groove 32 is provided on the outer periphery of the inner cylinder 31. The packing 33 for sealing between the inner periphery of the end of the connecting pipe P and the outer periphery of the inner cylinder 31 is fitted in the packing fitting groove 32. The packing 33 is formed with a protruding portion 33 a that protrudes radially outward from the outer peripheral surface of the inner cylinder 31. Further, the packing 33 is provided with a flat portion 33b having an outer peripheral surface formed substantially flush with the outer peripheral surface of the inner cylinder 31 at a position upstream of the protruding portion 33a in the insertion direction of the connecting pipe P. Yes.

  In such a plug-in type pipe joint, when the connecting pipe P is inserted, when the end of the connecting pipe P passes through the packing 33, first, the flat portion 33b located upstream of the packing 33 in the inserting direction of the connecting pipe P is formed. After first fitting in the connecting pipe P, the protruding portion 33a is subsequently fitted. For this reason, when the end surface of the connecting pipe P abuts against the protruding portion 33 a of the packing 33, the flat portion 33 b of the packing 33 is already fitted into the connecting pipe P. In the packing 33 in which the flat portion 33b is fitted in the connecting pipe P, the movement in the axial direction is restricted to some extent because the flat portion 33b is pressed from the radially outer side and pressed against the packing fitting groove 32. It is in the state that was done. Therefore, even if the connecting pipe P is further pushed in from the state where it abuts against the protruding portion 33a of the packing 33, there is little possibility that the packing 33 will be pushed out of the packing fitting groove 32 by being pushed by the connecting pipe P. .

JP 2003-42370 A

  However, in the plug-in type pipe joint, the groove side wall 32a on the downstream side in the connecting pipe insertion direction of the packing fitting groove 32 is formed perpendicular to the groove bottom of the packing fitting groove 32, while the connecting pipe insertion direction of the packing 33 is provided. Since the downstream end face 33c is formed flat corresponding to the vertical groove side wall 32a, when the axial movement restriction action by the flat portion 33b is not sufficient when pushed by the connecting pipe P, the packing 33 is The flat end face 33c of this is slid outwardly in the radial direction on the groove side wall 32a of the packing fitting groove 32, so that it is easy to protrude from the packing fitting groove 32.

  The present invention has been made in order to solve such a problem, and the object of the present invention is to provide an internal fitting body in which the end of the connecting pipe is inserted into an outer fitting shape as described above. An annular packing fitting groove is provided on the outer peripheral surface of the inner cylinder, and a packing for sealing between the inner periphery of the end of the connecting tube and the outer periphery of the inner cylinder is fitted in the packing fitting groove. An object of the present invention is to provide a plug-in type pipe joint that can reliably prevent the packing from being pushed out from the packing fitting groove on the end face of the connecting pipe by devising the cross-sectional shape of the packing in the plug-in type pipe joint. .

The plug-in type pipe joint according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 7 in order to facilitate understanding of the contents of the invention. The inner tube 2 into which the end portion of the connecting pipe P is inserted into an outer fitting shape is provided, and an annular packing fitting groove 14 is provided on the outer peripheral surface of the inner tube 2, and the connecting pipe P is inserted into the packing fitting groove 14. In the plug-in type pipe joint in which the packing 4 for sealing between the inner periphery of the end of the inner tube 2 and the outer periphery of the inner cylinder 2 is fitted, the packing 4 is in a state of being fitted in the packing fitting groove 14. A seal portion 4a that protrudes radially outward from the outer peripheral surface of the inner cylinder 2 is formed, and the end surface 4f on the downstream side in the connecting pipe insertion direction of the packing 4 is gradually narrowed toward the downstream side in the connecting pipe insertion direction. It is formed in the shape of a taper, and the downstream side of the packing fitting groove 14 in the connecting pipe insertion direction The side wall 14b, thereby forming a progressively widened taper towards the groove bottom of the packing fitting groove 14, the outer peripheral side of the connection pipe insertion direction downstream side end surface 4f groove open end of the groove sidewall 14b is in packing 4 It is formed so as to be positioned on the radially outer side of the inner cylinder 2 with respect to the end portion, and has a diameter larger than the outer peripheral surface of the inner cylinder 2 at a position corresponding to the upstream side in the connecting tube insertion direction with respect to the seal portion 4a in the packing 4 The dust removal cleaning part 4b which protrudes outward in the direction is formed, and the dust removal cleaning part 4b is connected to the connecting pipe by applying a pressing force to the dust removal cleaning part 4b toward the side corresponding to the downstream side in the connecting pipe insertion direction. It is characterized in that it is compressed and deformed so as to fall down on the side corresponding to the downstream side in the insertion direction .

  According to the above configuration, when the connecting pipe P is inserted, the end surface of the connecting pipe P abuts against the seal portion 4 a of the packing 4 when the end of the connecting pipe P passes through the packing 4. When the connecting pipe P is pushed deeper from the state where the end face of the connecting pipe abuts against the seal portion 4a of the packing 4, the packing 4 is pushed in the insertion direction of the connecting pipe P by the connecting pipe P. The downstream end face 4f in the tube insertion direction abuts against the groove side wall 14b on the downstream side in the connecting tube insertion direction of the packing fitting groove 14, and this contact action causes the downstream end of the packing 4 in the connecting tube insertion direction to be fitted in the packing. Since the groove 14 is pushed in the bottom direction, that is, in the anti-extrusion direction, the packing 4 can be reliably prevented from being pushed out by the connecting pipe P and protruding from the packing fitting groove 14.

  When the packing 4 is pushed in the insertion direction of the connection pipe P due to the insertion of the connection pipe P, the end surface 4f on the downstream side in the connection pipe insertion direction of the packing 4 comes into contact with the taper of the groove side wall 14b and the bottom direction of the packing fitting groove 14 Therefore, it is possible to more effectively prevent the packing 4 from being pushed by the connecting pipe P and protruding from the packing fitting groove 14.

  According to the present invention, when the connecting pipe is inserted, the packing is advantageously prevented from being pushed out from the packing fitting groove at the end face of the connecting pipe.

  A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a half-notch cross-sectional view showing the plug-in type pipe joint of the first embodiment before the connection pipe is inserted, and FIG. 2 is a half-notch cross-section showing the plug-in type pipe joint of FIG. FIG. 3 is a half cutaway cross-sectional view showing the plug-in type pipe joint of FIG. 1 in a state after the connection pipe is inserted, FIG. 4 is a cross-sectional view of the internal cylinder and packing of the plug-in type pipe joint of FIG. 5 is a half cutaway cross-sectional view of the packing of the plug-in type pipe joint of FIG.

  In FIG. 1, the plug-in type pipe joint includes an inner cylinder 2, an outer cylinder 3, a packing 4, a retaining ring 5, and a cap 6 in a joint body 1.

  As shown in FIG. 1, the joint body 1 is formed in a cylindrical shape with a metal such as bronze casting or plastic, and has a fluid passage 7 formed in a penetrating shape in the axial direction. The inner cylinder 2 is integrally protruded from the portion outward in the axial direction in parallel with the central axis O of the fluid passage 7, and the fluid passage 7 is formed in communication with the inside of the inner cylinder 2. Further, at one end in the axial direction of the joint body 1, a connecting pipe made of resin or metal such as polybutene or cross-linked polyethylene is provided between the outer cylinder 3 formed separately from the joint body 1 and the outer peripheral surface of the inner cylinder 2. It is attached concentrically with the inner cylinder 2 so as to form a connecting pipe insertion gap 8 for receiving the end of P. At the time of attachment, the inner peripheral step portion 9 of the base end portion of the outer cylinder 3 is press-fitted into the step portion 10 formed on the outer periphery of the base portion of the inner cylinder 2 of the joint body 1 to be engaged and fixed.

  A cylindrical cap 6 is integrally attached to the opening end of the outer cylinder 3. At the time of attachment, an annular protrusion 12 provided on the inner periphery of the base end of the cap 6 is press-fitted into an annular groove 11 provided on the outer periphery of the opening end of the outer cylinder 3. It is attached concentrically with the inner cylinder 2 so as to form a connection pipe receiving port 13 communicating with the connection pipe insertion gap 8 between the outer circumference of the inner cylinder 2.

As shown in FIGS. 1 and 4, a packing fitting groove 14 is provided on the outer peripheral surface of the inner cylinder 2, and the inner circumference of the end of the connecting pipe P and the outer circumference of the inner cylinder 2 are formed in the packing fitting groove 14. A cylindrical packing 4 made of synthetic rubber, natural rubber, synthetic resin, or the like is sealed.
As shown in FIGS. 4 and 5, the packing 4 forms a seal portion 4 a that protrudes radially outward from the outer peripheral surface of the inner cylinder 2 in a state where the packing 4 is fitted in the packing fitting groove 14. Further, the end face 4f of the packing 4 on the downstream side in the insertion direction of the connecting pipe P (hereinafter referred to as “downstream side in the connecting pipe insertion direction”) is formed in a tapered shape gradually narrowing toward the downstream in the connecting pipe insertion direction. . The taper angle θ of the end face 4f is preferably 50 to 85 °, more preferably 66 °. Corresponding to the taper of the end face 4 f on the downstream side in the connecting pipe insertion direction of the packing 4, the groove side wall 14 b on the downstream side in the connecting pipe insertion direction of the packing fitting groove 14 gradually increases toward the groove bottom of the packing fitting groove 14. The taper is widened.

  Further, the packing 4 will be described in detail. As shown in FIGS. 4 and 5, it corresponds to the upstream side in the insertion direction of the connection pipe P from the seal portion 4 a of the packing 4 (hereinafter referred to as “upstream side in the connection pipe insertion direction”). A dust removal cleaning portion 4b that protrudes radially outward from the outer peripheral surface of the inner cylinder 2 is formed at the position where the inner cylinder 2 is to be operated. Between the seal part 4a and the dust removal cleaning part 4b in the packing 4, an annular concave groove 4c is formed in the circumferential direction, which is recessed radially inward from the outer peripheral surface of the inner cylinder 2. A taper 15 that is gradually narrowed toward the upstream side in the connecting pipe insertion direction is formed on the end face side of the dust removal cleaning part 4b on the upstream side in the connecting pipe insertion direction. On the upstream side of the packing fitting groove 14 in the connecting pipe insertion direction, an annular protrusion fitting concave groove 14a deeper than the packing fitting groove 14 is provided, and on the upstream side of the inner diameter portion of the packing 4 in the connecting pipe insertion direction, An annular projection 4d that fits into the projection fitting groove 14a is formed. An annular ridge 4e having an inner diameter smaller than the diameter of the packing fitting groove 14 is formed in the inner diameter portion corresponding to the radially inner side of the seal portion 4a of the packing 4.

  As shown in FIG. 1, the retaining ring 5 is a stainless steel product, and has an elastically expandable / reducible deformable biting tooth 5a on the inner diameter portion of the dish-shaped cross section. The outer diameter portion of the retaining ring 5 is interposed between the step portion 16 provided on the inner back side of the projection 12 on the inner periphery of the cap 6 and the opening end surface of the outer cylinder 3, and the biting teeth 5 a are connected. It protrudes into the tube insertion gap 8.

  Next, a usage mode of the plug-in type pipe joint having the above configuration will be described. In the on-site construction, the connecting pipe P is cut to a required length. The end of the cut connection pipe P is inserted into the connection pipe receiving port 13. At this time, when the end of the connecting pipe P passes through the packing 4, first, the dust removal cleaning part 4b located upstream in the connecting pipe insertion direction of the packing 4 is first fitted into the connecting pipe P as shown in FIG. Subsequently, the seal portion 4a is internally fitted as shown in FIG. For this reason, when the end surface of the connecting pipe P hits the seal part 4a of the packing 4 as shown in FIG. 2, the dust removal cleaning part 4b of the packing 4 is already fitted in the connecting pipe P. The packing 4 in a state where the dust removal cleaning part 4b is fitted in the connecting pipe P is moved to some extent in the axial direction because the dust removal cleaning part 4b is pressed from the radially outer side and pressed against the packing fitting groove 14. It is in a regulated state. Therefore, even if the connecting pipe P is pushed deeper as shown in FIG. 3 from the state where the connecting pipe P hits the seal portion 4a of the packing 4 as shown in FIG. 2, the packing 4 is pushed out of the packing fitting groove 14 by the connecting pipe P. There is no.

  In particular, the end face 4f on the downstream side in the connecting pipe insertion direction of the packing 4 is formed in a tapered shape gradually narrowing toward the downstream in the connecting pipe insertion direction, so that the end face of the connecting pipe P is the seal of the packing 4 When the packing 4 is further pushed in from the state of abutting against the portion 4a, the end face 4f on the downstream side in the connecting pipe insertion direction of the packing 4 comes into contact with the groove side wall 14b on the downstream side in the connecting pipe insertion direction of the packing fitting groove 14 and the packing fitting groove By receiving the action of being pushed toward the bottom of 14, the packing 4 can be effectively prevented from being pushed out from the packing fitting groove 14.

  At that time, if the groove side wall 14b on the downstream side of the packing fitting groove 14 in the connecting pipe insertion direction is formed to have a taper that gradually expands toward the groove bottom of the packing fitting groove 14, the packing pipe P is inserted into the packing. When 4 is pushed in the insertion direction of the connecting pipe P, the end face 4f on the downstream side in the insertion direction of the connecting pipe P of the packing 4 comes into contact with the taper of the groove side wall 14b on the downstream side in the insertion direction of the packing fitting groove 14 to seal the packing. An action of being surely pushed toward the bottom of the fitting groove 14 is received. For this reason, it can prevent more effectively that the packing 4 is pushed by the connection pipe P, and protrudes from the packing fitting groove | channel 14. FIG.

  Moreover, when inserting the connecting pipe P, as described above, first, the dust removal cleaning portion 4b of the packing 4 is first fitted into the connecting pipe P and is in sliding contact with the inner face of the connecting pipe P. The dust and foreign matters adhering to the dust are surely removed by the dust removing cleaning part 4b, and the dust and foreign substances are not bitten between the inner peripheral surface of the connecting pipe P and the seal part 4a of the packing 4, It is possible to prevent the seal portion 4a from being damaged or the sealing performance from being deteriorated.

  In addition, the packing 4 is formed with an annular groove 4c that is recessed radially inward from the outer peripheral surface of the inner cylinder 2 between the seal portion 4a and the dust removal cleaning portion 4b. It effectively functions as a relief of the dust removal cleaning portion 4b that is pressed inward in the radial direction by the connecting pipe P and compressively deforms. Therefore, the dust removal cleaning part 4b can be easily compressed and deformed when pressed inward in the radial direction by the connecting pipe P, whereby dust and foreign substances can be more reliably removed by the dust removal cleaning part 4b. Further, since the concave groove 4c functions effectively as a relief of the seal portion 4a that is compressed and deformed by being pressed radially inward by the connecting pipe P, the seal portion 4a is pressed radially inward by the connecting pipe P. Sometimes it can be easily compressed and deformed, and the connecting pipe P can be easily inserted.

  Since an end face on the upstream side in the connecting pipe insertion direction of the dust removal cleaning portion 4b is formed with a tapered taper 15 gradually toward the upstream side in the connecting pipe insertion direction, when the connection pipe P is inserted, the packing 4 It is easy to fit the dust removal cleaning part 4b into the connecting pipe P. Further, the packing 4 moves in the axial direction when the dust removal cleaning portion 4b and the seal portion 4a of the packing 4 are pressed by the connecting pipe P due to the fitting of the annular protrusion 4d and the protrusion fitting concave groove 14a. Can be reliably controlled, and the packing 4 can be more effectively prevented from being pushed out from the packing fitting groove 14.

  Since an annular ridge 4e having an inner diameter smaller than the diameter of the packing fitting groove 14 is formed on the inner diameter portion corresponding to the radially inner side of the seal portion 4a of the packing 4, the annular ridge 4e is connected As the seal portion 4 a is pressed radially inward by the pipe P, the pressure is locally pressed to the bottom of the packing fitting groove 14 to compress and deform to increase the contact pressure of the packing 4 against the bottom of the packing fitting groove 14. And the movement of the packing 4 in the axial direction can be effectively prevented.

  As shown in FIG. 3, when the end of the connection pipe P is completely inserted into the connection pipe insertion gap 8, the seal portion 4 a of the packing 4 comes into close contact with the inner peripheral surface of the connection pipe P in a compressed manner. Thus, a state is obtained in which the space between the inner peripheral surface of the connecting pipe P and the outer peripheral surface of the inner cylinder 2 is obtained, and the biting teeth 5a of the retaining ring 5 bite into and engage with the outer peripheral surface of the connecting pipe P. A P retaining state is obtained.

  In the packing 4 of the above-described embodiment, a dust removal cleaning portion 4b for removing dust and foreign matters adhering to the inner surface of the connecting pipe P, and an annular ring that effectively functions as a relief for the dust removal cleaning portion 4b and a relief for the seal portion 4a. However, the present invention is not necessarily limited to the packing 4 in the form of forming the dust removal cleaning portion 4b or the annular recess groove 4c. Even if the shape does not include the portion 4b or the annular concave groove 4c, the packing 4 in which the end face 4f on the downstream side in the connecting pipe insertion direction is gradually tapered toward the downstream side in the connecting pipe insertion direction. In this case, the intended purpose can be achieved.

  The present invention can be similarly applied to the joint body 1 having a cross-sectional shape as shown in FIG. In the embodiment shown in FIG. 6, the insertion guide ring 20 to be inserted into the joint main body 1 is incorporated prior to the connection pipe P when the connection pipe P is inserted, and the structure and the prevention of the retaining ring 21 itself. The method of assembling the ring 21 to the joint body 1 is different from that of the retaining ring 5 of the above embodiment, and the configuration and operation of the other inner cylinder 2 and packing 4 are the same as those of the above embodiment. The same reference numerals are assigned to the same elements, and detailed description thereof is omitted.

  The joint body 1 of this embodiment is formed in a cylindrical shape, and the fluid passage 7 is formed in a penetrating manner in the axial direction, and an opaque guide ring concealing cylinder 17 is axially formed from one axial end of the joint body 1. The outer cylinder 2 protrudes integrally in parallel with the central axis O of the fluid passage 7 and guides the inner cylinder 2 longer than the guide ring concealment cylinder 17 from the inside of the guide ring concealment cylinder 17 at one end of the joint body 1. Concentrically with the concealing cylinder 17, it projects integrally outward in the axial direction, and a fluid passage 7 is formed in the inner cylinder 2 in communication. Between the outer periphery of the inner cylinder 2 and the inner periphery of the guide ring concealing cylinder 17, a guide ring entry space 18 into which the insertion guide ring 20 finally enters after the connection pipe P is inserted is formed. A male screw 19 is provided on the outer periphery of the guide ring concealing cylinder 17. The axial depth of the guide ring entry space 18 is formed to be equal to or deeper than the axial length of the insertion guide ring 20. The guide ring concealing cylinder 17 is formed separately from the joint body 1 and integrally joined to one end of the joint body 1 instead of being integrally formed at one end of the joint body 1. May be.

  The joint body 1 includes an outer cylinder 22 formed in a cylindrical shape with a resin that is transparent or translucent and can be seen through, and a female screw 23 is provided on the inner periphery of the rear end portion of the outer cylinder 22. The outer tube 22 is screwed and connected to the male screw 19 of the guide ring concealing tube 17, and the connecting tube for receiving the end of the connecting tube P between the inner periphery of the outer tube 22 and the outer periphery of the inner tube 2. The receiving port 24 is formed to communicate with the guide ring entry space 18.

  The retaining ring 21 is made of a wire material such as stainless steel, and a biting tooth 21a that bites into the outer peripheral surface of the connecting pipe P inserted into the connecting pipe receiving port 24 is provided on the inner diameter portion thereof. A part of the circumference of 21 is cut off, and the entire retaining ring 21 is formed so as to be capable of expanding and contracting its diameter.

The retaining ring 21 is housed in an annular retaining ring housing recess 25 provided on the inner periphery of the outer cylinder 22 on the front opening end side, and the inner circumferential surface on the axially outer side in the retaining ring housing recess 25. The taper surface 26 for applying a force in the direction of diameter reduction to the retaining ring 21 is formed so as to be constricted toward the opening end of the outer cylinder 22.
As a means for providing the retaining ring housing recess 25 on the inner periphery of the outer cylinder 22, a cylindrical spacer 27 that is transparent or translucent and transparently visible inside the outer cylinder 22 is provided as a guide ring concealing cylinder. 17 is fitted on the extension line of the distal end portion via a backup rubber 28, and a retaining ring accommodating recess 25 is provided between the opening end surface (axially outer end surface) of the spacer 27 and the tapered surface 26. Form. According to this, the outer cylinder 22 can be easily molded with a simple molding die structure, and the retaining ring 21 can be easily incorporated into the retaining ring housing recess 25. However, the present invention is not limited to this, and the retaining ring accommodating recess 25 can be formed by cutting the inner periphery of the outer cylinder 22 without using such a spacer 27.

  The insertion guide ring 20 is a resin molded product such as nylon, and is colored differently from the color of the outer surface of the connection pipe P so that it can be clearly distinguished from the connection pipe P. For example, when the color of the connection pipe P is white, the insertion guide ring 20 is blue, red, or green. The insertion guide ring 20 has a rearwardly expanding taper 20a that gradually expands rearward from the front end portion, and an outer diameter portion of the insertion guide ring 20 from the rear end portion to the front, opposite to the inner diameter portion. A taper 20b having a front expanding shape that gradually expands is provided to form a V-shaped cross section. The insertion guide ring 20 is also fluorescent / phosphorescent so that it can be easily confirmed even in a dark place by applying a luminescent paint using a phosphor / phosphor or molding with a synthetic resin containing a luminescent pigment. Can be formed. The insertion guide ring 20 is assembled between the inner periphery of the retaining ring 21 and the outer periphery of the front opening end of the inner cylinder 2 with the front end directed toward the inlet side of the connection tube receiving port 24.

  Since the packing fitting groove 14 is provided in the outer peripheral surface of the inner cylinder 2 of the joint main body 1 and the packing 4 is fitted in the packing fitting groove 14, it is the same as in the case of the above-described embodiment. Description is omitted.

  Next, a usage mode of the plug-in type pipe joint having the above configuration will be described. In on-site construction, first, the connecting pipe P is cut to a required length. As shown in FIG. 7, the end of the cut connection pipe P is inserted into the connection pipe receiving port 24, and the insertion guide ring 20 is pushed from the front of the connection pipe P at the end thereof to be connected. It is pushed inwardly of the tube receiving port 24. The insertion guide ring 20 to be pushed is pushed out by the taper 20b of the outer diameter portion to widen the retaining ring 21, and the dust removal cleaning portion 4b protruding from the outer peripheral surface of the inner cylinder 2 by the taper 20a of the inner diameter portion. The seal portion 4a passes while being compressed inward in the radial direction. In this way, the taper 20a of the insertion guide ring 20 passes through the dust removal cleaning portion 4b and the seal portion 4a protruding from the outer peripheral surface of the inner cylinder 2 while being compressed, so that the inner periphery of the end portion of the connection pipe P is chamfered in advance. Even if it is not processed, the connecting pipe P can be smoothly inserted without sticking to the packing 4.

  As described above, whether or not the connection pipe P normally pushes the insertion guide ring 20 and whether or not the insertion guide ring 20 and the connection pipe P normally pass through the retaining ring 21 are determined by the outer cylinder. Since 22 is transparent or translucent, and the insertion guide ring 20 is given a color different from that of the connecting pipe P and can be easily distinguished from the connecting pipe P, it can be easily visually confirmed from the outside. Therefore, for example, there is a problem that the connecting pipe P is inserted obliquely and the insertion guide ring 20 is not pushed normally, or the insertion guide ring 20 does not normally pass through the retaining ring 21. If it occurs, this can be discovered very quickly, so that the insertion of the connecting pipe P can be immediately stopped and reinserted.

When the connecting pipe P is pushed further deeper from the state where the end face of the connecting pipe abuts against the seal portion 4a of the packing 4, the end face 4f on the downstream side in the connecting pipe insertion direction of the packing 4 is downstream of the packing fitting groove 14 in the connecting pipe insertion direction. It is possible to effectively prevent the packing 4 from being pushed out from the packing fitting groove 14 by receiving the action of being pressed toward the bottom of the packing fitting groove 14 by abutting against the groove side wall 14b. It is the same as the case of.
Further, when the end of the connection pipe P passes through the packing 4 following the insertion guide ring 20, first, the dust removal cleaning part 4b of the packing 4 is first fitted into the connection pipe P, and subsequently the seal part 4a is fitted. Therefore, when the end surface of the connection pipe P abuts against the seal part 4a of the packing 4, the dust removal cleaning part 4b of the packing 4 is already fitted in the connection pipe P. Therefore, the connection pipe P is in the packing 4 state. It is possible to prevent the packing 4 from being pushed out of the packing fitting groove 14 by the connecting pipe P even if it is pushed deeper from the state where it is in contact with the seal portion 4a, and the inner surface of the connecting pipe P when the connecting pipe P is inserted. The dust and foreign matter adhering to the dust is surely removed by the dust removal cleaning unit 4b, and the dust and foreign matter are bitten between the inner peripheral surface of the connecting pipe P and the seal part 4a of the packing 4. Without or scratch the seal portion 4a, for it, such as a sealing performance can be prevented from being lowered, the same as in the above embodiment.

As shown in FIG. 7, when the end portion of the connection pipe P is completely inserted into the connection pipe receiving port 24, the seal portion 4 a of the packing 4 is in close contact with the inner peripheral surface of the connection pipe P in a compressed manner. A state of sealing between the inner peripheral surface of the connecting pipe P and the outer peripheral surface of the inner cylinder 2 is obtained, and the biting teeth 21a of the retaining ring 21 bite into and engage with the outer peripheral surface of the connecting pipe P. Can be obtained.
When the end portion of the connecting pipe P is completely inserted into the connecting pipe receiving port 24 as shown in FIG. 7, the insertion guide ring 20 reaches the guide ring entry space 18 in the opaque guide ring concealing cylinder 17. In the case of insufficient insertion, the insertion guide ring 20 may go out of the guide ring concealment cylinder 17 without entering the guide ring entry space 18. Since it will be visible, it can be easily confirmed whether or not the end of the connecting pipe P has been completely inserted to the back of the connecting pipe receiving port 24. Accordingly, it is possible to prevent poor insertion or insufficient insertion of the connecting pipe P that causes water leakage.

  After the connection pipe P is inserted, when the connection pipe P is pulled in the extracting direction, the outer peripheral surface of the retaining ring 21 that accompanies the connecting pipe P abuts against the tapered surface 26 of the outer cylinder 22, so that the retaining ring 21 is By reducing the diameter, the biting of the biting teeth 21a on the outer peripheral surface of the connecting pipe P increases. Thus, by increasing the biting of the retaining ring 21 into the outer peripheral surface of the connecting pipe P, the connecting pipe P is reliably prevented from coming out from the connecting pipe receiving port 24.

  In the above-described embodiment, the packing 4 is described as having a dust removal cleaning portion 4b, a concave groove 4c and an annular protrusion 4d. However, the present invention describes the dust removal cleaning portion 4b, the concave groove 4c and the annular protrusion. Needless to say, the present invention is not limited to the packing 4 having the shape 4d, and can be similarly applied to the packing 4 having the dust removal cleaning portion 4b, the groove 4c and the annular protrusion 4d shown in FIG.

  The present invention can be similarly applied to any case where the joint body 1 is a socket type, an elbow, a T-type, or the like.

It is a half notched cross-sectional view showing the plug-in type pipe joint of one embodiment of the present invention in a state before inserting the connecting pipe. FIG. 2 is a half-broken cross-sectional view showing the plug-in type pipe joint of FIG. 1 in a state where the connecting pipe is being inserted. FIG. 2 is a half cutaway cross-sectional view showing the plug-in type pipe joint of FIG. 1 in a state after the connection pipe is inserted. FIG. 2 is a half cutaway cross-sectional view of an inner cylinder and packing of the plug-in type pipe joint of FIG. 1. It is a half notched cross-sectional view of the packing of the plug-in type pipe joint of FIG. It is a half notch cross-sectional view which shows the insertion type pipe joint of another Example in the state before connecting pipe insertion. FIG. 7 is a half cutaway cross-sectional view showing the plug-in type pipe joint of FIG. 6 in a state after the connection pipe is inserted. FIG. 6 is a half cutaway cross-sectional view showing another embodiment of the packing corresponding to FIG. 5. It is a half notched cross-sectional view showing the plug-in type pipe joint of the conventional example in a state before inserting the connecting pipe. It is an expanded sectional view of the packing of the insertion type pipe joint of the conventional example of FIG. FIG. 10 is a half-broken cross-sectional view showing the plug-in type pipe joint of the conventional example of FIG. 9 in a state after the connection pipe is inserted.

P Connection pipe 1 Joint body 2 Inner cylinder 4 Packing 4a Sealing part 4f End face on the downstream side of the packing pipe insertion direction 14 Packing fitting groove 14b Groove side wall

Claims (1)

An inner cylinder into which the end of the connection pipe is inserted into an outer fitting shape is provided inside the joint body, an annular packing fitting groove is provided on the outer peripheral surface of the inner cylinder, and the connection pipe is provided in the packing fitting groove. In the plug-in type pipe joint that is fitted with a packing for sealing between the inner periphery of the end and the outer periphery of the inner cylinder,
The packing forms a seal portion that protrudes radially outward from the outer peripheral surface of the inner cylinder in a state of being fitted in the packing fitting groove, and has an end surface on the downstream side in the connecting pipe insertion direction of the packing. The taper is gradually tapered toward the downstream side of the connecting pipe insertion direction,
A taper that the groove side wall on the downstream side in the connecting pipe insertion direction of the packing fitting groove gradually expands toward the groove bottom of the packing fitting groove corresponding to the taper of the end face on the downstream side in the connecting pipe insertion direction of the packing And the groove opening side end of the groove side wall is formed so as to be positioned on the radially outer side of the inner cylinder with respect to the outer peripheral side end of the end surface on the downstream side in the connecting pipe insertion direction in the packing,
A dust removal cleaning part that protrudes radially outward from the outer peripheral surface of the inner cylinder is formed at a position corresponding to the upstream side in the connecting pipe insertion direction from the seal part in the packing,
When the pressing force is applied to the dust removal cleaning portion toward the side corresponding to the downstream side in the connecting pipe insertion direction, the dust removal cleaning portion is compressed and deformed so as to fall down to the side corresponding to the downstream side in the connection pipe insertion direction. A plug-in type pipe joint characterized by

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