JP2010065745A - Plug-in type pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug-in type pipe joint using a lip packing for improving sealing performance. <P>SOLUTION: A joint body 21 stores an anti-come-off member 23, a collar 36 for holding the anti-come-off member 23, an elastic member 24 for thrusting and energizing the anti-come-off member 23 toward a tapered face 33 together with the collar 36, a spacer 38 for holding the elastic member 24 at its end, and the lip packing 25 to be closely attached to the outer peripheral face of a connection pipe 31. When water flowing in the joint body 21 flows from between the inner periphery of the joint body 21 and the terminal end of the connection pipe 31 into the lip packing 25, the lip packing 25 is subjected to water pressure to push the spacer 38 toward the upstream side in the plug-in direction of the connection pipe so that the end of a ring-shaped portion 25a on the upstream side in the plug-in direction of the connection pipe abuts on a tapered face 38t of the spacer 38. Thus, the end of the ring-shaped porion 25a on the upstream side in the plug-in direction of the connection pipe is operated to be displaced toward an inner peripheral face 39 of the joint body 21 to improve the bearing pressure on the inner peripheral face 39. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  As this type of one-touch plug-in pipe joint, the present applicant has previously proposed a plug-in pipe joint 1 as shown in FIGS. 8 to 10 (Japanese Patent Application No. 2007-16993). The insertion-type pipe joint 1 has a receiving portion 12 for receiving the end portion of the connecting pipe 11 and is gradually tapered toward the upstream side in the connecting pipe insertion direction on the inner periphery of the receiving portion 12. Inside the joint body 2 forming the surface 13, the outer diameter portion is inscribed in the tapered surface 13 and the inner diameter portion is engaged with the outer peripheral surface of the connecting pipe 11 in order from the receiving port 12 toward the inner depth of the joint body. A retaining member 3, a collar 15 that holds the retaining member 3, an elastic member 4 that presses and urges the retaining member 3 together with the collar 15 toward the tapered surface 13, and a downstream side of the elastic member 4 in the connecting pipe insertion direction. An annular spacer 17 that holds the end portion and a lip packing 5 that is in close contact with the outer peripheral surface of the connecting pipe 11 are accommodated.

  Further, the joint body 2 is provided with an anti-scratching sleeve 7 which is disposed on the inner diameter portion of the lip packing 5 and can be fitted to the end of the connecting pipe 11. The anti-scratching sleeve 7 is as shown in FIG. As the connecting pipe 11 is inserted to a predetermined length, the end of the connecting pipe 11 is pushed toward the inside of the joint body 2 so as to come out of the lip packing 5. The lip packing 5 is formed in a shape having a ring-shaped portion 5a and a lip portion 5b projecting radially inward from the inner periphery of the ring-shaped portion 5a. The lip portion 5b of the lip packing 5 is deformed to expand in diameter as the damage prevention sleeve 7 comes out, and is brought into close contact with the outer peripheral surface of the connecting pipe 11.

According to the plug-in type pipe joint having such a configuration, the retaining member 3 that engages with the outer peripheral surface of the connection pipe 11 is accommodated in the joint main body 2, so the connection pipe 11 is inserted from the receiving portion 12. It can be connected in a retaining shape with just one touch operation.
An elastic member 4 that presses and urges the retaining member 3 toward the inner periphery of the receiving portion 12 is accommodated between the lip packing 5 and the retaining member 3 in the joint body 2. Since the tapered surface 13 in contact with the outer diameter portion of the retaining member 3 is formed in the inner periphery so as to be narrowed toward the upstream side in the connecting tube insertion direction, the connecting tube 11 is completely inserted as shown in FIG. Then, the retaining member 3 is pressed against the tapered surface 13 of the receiving portion 12 by the elastic member 4, and the retaining member 3 is reduced in diameter by the tapered surface 13 and engaged with the outer peripheral surface of the connecting pipe 11, A reliable retaining state of the connecting pipe 11 is obtained.
In addition, when a pulling force is applied to the connecting pipe 11 after the connecting pipe 11 is inserted, the outer diameter portion of the retaining member 3 that accompanies the connecting pipe 11 comes into contact with the tapered surface 13 of the receiving portion 12, thereby preventing the retaining member. 3 moves radially inward, and the engaging force to the outer peripheral surface of the connecting pipe 11 increases. This reliably prevents the connection pipe 11 from coming out.

When the lip portion 5b of the lip packing 5 protrudes radially inward and is in close contact with the outer peripheral surface of the connecting pipe 11 in a compressed manner, the water flowing in the joint body 2 and the inner periphery of the joint body 2 Even if it flows into the lip packing 5 from between the terminal outer periphery of the connecting pipe 11, the water pressure generates a sealing pressure that presses the lip portion 5 b against the outer peripheral surface of the connecting pipe 11. This effectively demonstrates the sealing function.
Further, the lip portion 5b of the lip packing 5 can be easily deformed by a sliding contact action with the outer peripheral surface of the connection pipe 11 with a small insertion load of the connection pipe 11, so that the connection pipe 11 can be easily inserted.

  Since the damage prevention sleeve 7 that can be fitted on the end of the connecting pipe 11 is provided, even when the connecting pipe 11 is cut, a slight outer edge is generated on the cut end face and the removal is not performed. Even if the pipe 11 is inserted obliquely, it can be constructed without damaging the lip packing 5 with the outer edge of the end of the connecting pipe 11 or the like.

  However, in the plug-in type pipe joint, the upstream end surface 5c of the ring-shaped portion 5a of the lip packing 5 in the connection pipe insertion direction and the downstream end face 17a of the spacer 17 in contact with the end surface 5c in the connection pipe insertion direction are respectively connected to the joint. It is formed on a vertical plane orthogonal to the axial direction of the main body 2. For this reason, when the water flowing in the joint body 2 flows into the lip packing 5 from between the inner periphery of the joint body 2 and the outer periphery of the end of the connecting pipe 11, the lip packing 5 in the state shown in FIG. In response to the water pressure (internal pressure) P, the spacer 17 is pushed and moved in the direction upstream of the connecting pipe insertion direction against the elasticity of the elastic member 4 as shown in FIG. As the side end strongly presses and contacts the downstream end surface 17a of the spacer 17 in the connecting pipe insertion direction, the upstream end of the ring-shaped part 5a in the connecting pipe insertion direction is shown in FIG. Due to the action of displacing radially inwardly (in the direction of arrow A) away from the peripheral surface 2a, the outer peripheral portion of the upstream end of the ring-shaped portion 5a in the connecting pipe insertion direction and the inner peripheral surface 2a of the joint main body 2 are thereby obtained. The surface pressure of the Kin 5 drops sealing performance due to the water leakage was a problem occurs.

  The present invention has been made in order to solve such problems, and the object of the present invention is to insert the retaining member, collar, elastic member, spacer, and lip packing as described above. An object of the present invention is to provide a plug-in type pipe joint capable of improving water-leakage prevention by improving the sealing performance by lip packing by devising the cross-sectional shape of the spacer.

  As described in claim 1, 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. A joint having a receiving portion (32) for receiving the end portion and forming a tapered surface (33) which is narrowed toward the upstream side in the connecting pipe insertion direction on the inner periphery of the receiving portion (32) Inside the main body (21), the outer diameter portion is inscribed in the tapered surface (33) and the inner diameter portion is engaged with the outer peripheral surface of the connecting pipe (31) in order from the receiving portion (32) to the inner depth of the joint main body. A retaining member (23), a collar (36) that holds the retaining member (23), and an elastic member that presses and urges the retaining member (23) together with the collar (36) toward the tapered surface (33). 24) and an annular spacer holding the downstream end of the elastic member (24) in the connecting pipe insertion direction. The sir (38) and the lip packing (25) closely contacting the outer peripheral surface of the connecting pipe (31) are accommodated. The lip packing (25) includes a ring-shaped portion (25a) and the ring-shaped portion (25a). ) And a lip portion (25b) projecting radially inward from the inner circumference of the ring-shaped portion (25a), the upstream end of the ring-shaped portion (25a) in the connecting tube insertion direction. The downstream end face (38a) of the spacer (38) in contact with the connecting portion is formed in a tapered surface (38t) that is gradually narrowed toward the downstream side in the connecting pipe insertion direction. It is what you have.

  As described above, the downstream end surface (38a) of the spacer (38) in contact with the upstream end of the ring-shaped portion (25a) of the lip packing (25) in the connecting tube insertion direction is inserted into the connecting tube. By adopting a configuration in which the tapered surface (38t) is gradually narrowed toward the downstream side in the direction, water unexpectedly flowing in the joint body (21) and the inner circumference of the joint body (21) and the connecting pipe When the lip packing (25) flows into the lip packing 5 from between the outer periphery of the terminal 11, the spacer (38) is connected against the elastic force of the elastic member (24) by receiving the water pressure (internal pressure). While pushing in the upstream direction of the tube insertion direction, the upstream end of the ring-shaped portion (25a) in the connection tube insertion direction strongly contacts the tapered surface (38t) of the spacer (38). Since the upstream end portion of the ring-shaped portion (25a) is displaced toward the inner peripheral surface (39) of the joint body (21), the connecting tube insertion direction of the ring-shaped portion (25a) The surface pressure between the outer diameter portion at the upstream end and the inner peripheral surface (39) of the joint body (21) increases, and the sealing function by the lip packing (25) can be improved.

  According to the present invention, the lip packing is directed toward the spacer by the internal pressure by a simple means of forming a tapered surface gradually narrowing toward the downstream side in the connecting pipe insertion direction on the downstream end face of the spacer in the connecting pipe insertion direction. Even when pushed and moved, there is an advantage that the sealing performance by the lip packing can be improved and water leakage can be prevented.

  FIG. 1 is a cross-sectional view of a half-notch showing an insertion-type pipe joint according to an embodiment of the present invention before the connection pipe is inserted, and FIG. Fig. 3 is a cross-sectional view of the plug-in pipe joint after it is inserted into the connecting pipe. Fig. 4 is a perspective view of the damage prevention sleeve of the plug-in pipe fitting. FIG. 6 is a half cutaway cross-sectional view of the plug-in pipe joint spacer, FIG. 6 is a half cutaway cross-sectional view showing a state in which water flowing through the plug-in pipe fitting flows into the lip packing, and FIG. It is an effect | action figure of the lip packing in FIG.

  As shown in FIGS. 1 to 3, a plug-in type pipe joint 20 showing an embodiment of the present invention is accommodated and disposed in a joint body 21 having a cylindrical shape with both ends opened, and the joint body 21. A retaining member 23, an elastic member 24, a lip packing 25, a scratch prevention sleeve 27, and the like.

  Since the joint body 21 requires corrosion resistance and rigidity, it is manufactured by, for example, a precision casting method using an SCS material or a bronze material. As shown in FIG. 1, the joint body 21 is provided with a first step portion 28 near the center in the axial direction, a large diameter portion 29 on one side and a small diameter portion on the other side across the first step portion 28. A flow path 30 is formed, an opening end portion of the large-diameter portion 29, that is, a receiving portion 32 into which an end portion of the connection pipe 31 is inserted at one end portion in the axial direction of the joint body 21 is formed and connected to the outer periphery of the other end portion A male screw 26 is formed. A tapered surface 33 that narrows toward the upstream side in the connecting tube insertion direction on the inner periphery of the opening end side of the receiving portion 32, and a circumferential groove 34 is formed at the outer end of the receiving portion of the tapered surface 33. ing. A second step portion 35 having a diameter larger than that of the first step portion 28 is provided on the inner periphery of the intermediate portion between the first step portion 28 and the tapered surface 33 in the receiving portion 32.

  As shown in FIG. 1, inside the receiving portion 32, a retaining member 23 that is inscribed in the tapered surface 33, a collar 36 that holds the retaining member 23, and the retaining member 23 together with the collar 36 toward the tapered surface 33. An elastic member 24 that presses and biases is accommodated. The retaining member 23 may be formed of a material harder than the connecting pipe 31, for example, martensitic stainless steel (SUS420) when the connecting pipe 31 is austenitic stainless steel (SUS304). A stopper ring 37 is fitted in the circumferential groove 34 of the joint main body 21 to prevent the collar 36 from slipping out of the receiving portion at the inner diameter portion thereof. The stopper ring 37 can be formed of austenitic stainless steel (SUS304) or the like.

  The elastic member 24 is formed of a compression coil spring or the like, and the rear end portion of the elastic member 24 is engaged with a step portion 36 a at the front end of the collar 36, and the front end portion of the elastic member 24 is adjacent to the lip packing 25. Engage with a shaped annular spacer 38. When a compression coil spring is used as the elastic member 24, this member can be formed of austenitic stainless steel (SUS304) or the like.

  The lip packing 25 is formed of an olefin rubber packing or the like so as to be elastically deformable. In particular, the lip packing 25 is formed of EPDM which is a terpolymer of ethylene, propylene and a diene monomer for crosslinking, which is excellent in chlorine resistance and heat resistance. Further, it can be formed of FKM (fluoro rubber) having excellent heat resistance and chemical resistance. As shown in FIG. 1, the lip packing 25 is formed to have a ring-shaped portion 25a and an elastically deformable annular lip portion 25b projecting radially inward from the inner periphery of the ring-shaped portion 25a. In the free state, the inner diameter of the lip portion 25b is smaller than the outer diameter of the connecting pipe 31. The lip packing 25 can be formed in a L-shaped section or the like in addition to the V-shaped or U-shaped section as shown in FIG. The lip packing 25 is accommodated in the second step portion 35 in the receiving portion 32.

  The scratch prevention sleeve 27 is made of plastic such as PP or PB or metal, and as shown in FIGS. 1 and 4, the inner diameter is substantially the same as or smaller than the inner diameter of the connecting pipe 31, and the outer diameter is a joint. A packing holding cylinder portion 27a formed smaller than the inner diameter of the inner peripheral surface 39 between the first step portion 28 and the second step portion 35 in the main body 21, and a rear end side of the packing holding cylinder portion 27a are integrated. Are formed so as to have a thin tube end receiving tube portion 27 b that is formed to have an inner diameter larger than the outer diameter of the connection tube 31 and can be fitted to the end of the connection tube 31. Between the inner peripheral surface of the packing holding cylinder portion 27a and the inner peripheral surface of the tube end receiving cylinder portion 27b, a step portion 40 with which the end of the connection pipe 31 abuts is formed. The lip portion 25b of the lip packing 25 in a free state (a state in which the lip packing 25 is not deformed so as to expand its diameter and no compressive stress or tensile stress is applied) is fitted to the outer periphery of the packing holding cylinder portion 27a. A recessed groove 41 having a substantially V-shaped cross section is formed. The rear end portion 27c of the tube end receiving tube portion 27b is formed in a trumpet shape that gradually increases in diameter rearward, so that when the connection tube 31 is inserted, the end of the connection tube 31 is the rear end of the tube end receiving tube portion 27b. The part 27c is inserted smoothly without being caught. In the tube end receiving tube portion 27b, slits 42 are provided at predetermined intervals in the circumferential direction. A round or tapered taper 43 is attached to the outer periphery of the tip end of the packing holding cylinder 27 a so that it can be easily inserted into the inner peripheral surface 39 in the joint body 21.

  The collar 36 is formed of a general-purpose engineering plastic such as cross-linked polyethylene or a special engineering plastic such as PPS (polyphenylene sulfide) having excellent heat resistance. As shown in FIG. 1, a plurality of holding holes 36b are formed in the circumferential direction. The retaining member 23 is fitted in each holding hole 36b. A plurality (two in the illustrated example) of engaging teeth 23 a are formed on the inner diameter side of each retaining member 23.

  As shown in FIGS. 1 and 5, the downstream end surface 38a of the spacer 38 in contact with the upstream end of the ring-shaped portion 25a of the lip packing 25 in the connecting pipe insertion direction is downstream in the connecting pipe insertion direction. The tapered surface 38t is gradually narrowed toward the end. The tapered surface 38t has, for example, an angle θ formed by the downstream end surface 38a of the spacer 38 with respect to the vertical connecting pipe insertion direction to 20 degrees.

  Next, the connection construction procedure of the connection pipe 31 by the plug-in type pipe joint 20 will be described with reference to FIGS.

First, when connecting the connection pipe 31, as shown in FIG. 2, the connection pipe 31 is inserted into the receiving port 32 of the joint body 21, and the end of the connection pipe 31 is connected to the pipe end receiving tube of the scratch preventing sleeve 27. It is inserted into the portion 27 b and brought into contact with the stepped portion 40 in the scratch preventing sleeve 27. With the insertion of the connecting pipe 31, the retaining member 23 moves inwardly of the joint body 21 along the tapered surface 33 of the receiving portion 32, and the engaging teeth 23 a approach the outer peripheral surface of the connecting pipe 31. Even if an external force is applied in the direction in which the connecting pipe 31 is pulled out in this state, the engaging teeth 23a of the retaining member 23 that contacts the tapered surface 33 of the receiving portion 32 are engaged with the outer peripheral surface of the connecting pipe 31 as shown in FIG. Therefore, the connecting pipe 31 will not come out.
Further, when the connecting pipe 31 is inserted, the damage prevention sleeve 27 is interposed between the lip packing 25 and the end of the connecting pipe 31, and the end face of the end of the connecting pipe 31 is not in contact with the lip packing 25 in this state. Since the joint body 21 is inserted in the contact state, even if an outer edge is formed on the end face of the connection pipe 31, the lip packing 25 is not damaged by the outer edge. Even if it is inserted obliquely, the lip packing 25 is not damaged at the end, and water leakage due to damage of the lip packing 25 does not occur.

When the connection pipe 31 is inserted further deeply, a seal connection state between the joint body 21 and the connection pipe 31 is obtained as shown in FIG. That is, when the connecting pipe 31 is inserted halfway into the joint main body 21 in the state shown in FIG. 2, the connecting pipe 31 pushes the scratch-preventing sleeve 27 inward in the joint main body, and the packing holding cylinder portion 27 a is the lip packing 25. Come to the same position.
Further, when the connecting pipe 31 is inserted, as shown in FIG. 3, the connecting pipe 31 has an anti-scratching sleeve 27 that abuts the packing holding cylinder part 27 a against the first step part 28 in the joint body 21 and the pipe end. The part receiving cylinder part 27b is pushed inward from the lip packing 25 in the joint body. In this process, the scratch-preventing sleeve 27 moves while turning the lip portion 25b of the lip packing 25 in the inner direction of the joint body, disengages from the lip packing 25, and in the state of FIG. In addition, the lip portion 25b of the lip packing 25 is in close contact with the outer peripheral surface of the connection pipe 31 in a compressed manner so that a state of hermetically sealing between the outer peripheral surface of the connection pipe 31 and the inner peripheral surface 39 of the joint body 21 is obtained. A retaining state in which the engaging teeth 23 a of the retaining member 23 are engaged with the outer peripheral surface of the connecting pipe 31 is obtained.

If the lip portion 25 b of the lip packing 25 is in compression contact with the outer peripheral surface of the connection pipe 31 in a state where the lip portion 25 b faces the inner back direction of the joint main body 21, the water flowing in the joint main body 21 flows into the inner periphery of the joint main body 21. The lip portion 25b is pressed against the outer peripheral surface of the connecting pipe 31 by the water pressure even if it flows into the lip packing 25 from between the sleeve and the scratch preventing sleeve 27 or between the end of the connecting pipe 31 and the scratch preventing sleeve 27. A seal pressure is generated, and therefore the sealing function is effectively exhibited by the single lip packing 25.
Further, the lip portion 25b of the lip packing 25 is easily deformed by the sliding action of the inner surface of the concave groove 41 of the damage prevention sleeve 27 and the outer peripheral surface of the tube end receiving tube portion 27b with a small insertion load of the connection pipe 31. Therefore, the connecting pipe 31 can be easily inserted and operated.

  After the connection pipe 31 is completely inserted, when the connection pipe 31 is pulled in the pulling direction, the outer diameter portion of the retaining member 23 that accompanies the connecting pipe 31 comes into contact with the constricted side of the tapered surface 33, so that the retaining member 23 is The engagement tooth 23a bites into the outer peripheral surface of the connection pipe 31 and increases the engagement force by moving radially inward. This reliably prevents the connection pipe 31 from coming out.

  If water that flows in the joint body 21 unexpectedly flows into the lip packing 25 from between the inner periphery of the joint body 21 and the outer periphery of the terminal end of the connection pipe 31, as shown in FIGS. The packing 25 receives the water pressure P and pushes the upstream end of the ring-shaped portion 25a in the connecting pipe insertion direction while pushing the spacer 38 toward the upstream side in the connecting pipe insertion direction while resisting the elasticity of the elastic member 24. Abutting on the tapered surface 38t of the spacer 38, this contact action causes the upstream end of the ring-shaped portion 25a to be displaced in the direction of arrow B toward the inner peripheral surface 39 of the joint body 21. Therefore (in FIG. 7, d indicates the amount of deformation in the direction of arrow B), the surface pressure between the outer diameter portion of the upstream end of the ring-shaped portion 25a in the connecting tube insertion direction and the inner peripheral surface 39 of the joint body 21 is reduced. Rise, lip packing 5 to increase the sealing function by. Therefore, it is possible to reliably prevent water flowing in the joint body 21 from leaking between the outer diameter portion of the upstream side end portion of the ring-shaped portion 25a of the lip packing 25 in the connecting pipe insertion direction and the inner peripheral surface 39 of the joint body 21. it can.

  In the above-described embodiment, the male thread adapter plug-in type pipe joint in which the male thread for connection 26 is formed on one side of the joint body 21 has been described. However, the present invention is not limited to this, and other structures, for example, left-right symmetry. Of course, the present invention can also be applied to socket-type plug fittings, elbow-type plug fittings, and the like. Further, the connecting pipe 31 is not limited to a metal pipe such as a stainless steel pipe, and can be applied to a connecting pipe made of resin, for example, a connecting pipe made of vinyl chloride.

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. It is a half notched cross-sectional view showing the plug-in type pipe joint in a state in the middle of connecting pipe insertion. It is a half notched cross-sectional view showing the plug-in type pipe joint in a state after inserting the connecting pipe. It is a perspective view of the damage prevention sleeve of the plug-in type pipe joint. It is a half notched sectional view of the spacer of the same plug-in type pipe joint. It is a half notched cross-sectional view showing a state when water flowing in the plug-in type pipe joint flows into the lip packing. It is an effect | action figure of the lip packing in FIG. 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 a half notched cross-sectional view showing the plug-in type pipe joint in a state in the middle of connecting pipe insertion. It is a half notched cross-sectional view showing the plug-in type pipe joint in a state after inserting the connecting pipe. It is a half notched sectional view of the spacer of the same plug-in type pipe joint. It is a half notched cross-sectional view showing a state when water flowing in the plug-in type pipe joint flows into the lip packing. It is an effect | action figure of the lip packing in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 Plug-in type pipe joint 21 Joint main body 23 Detachment member 24 Elastic member 25 Lip packing 25a Ring-shaped part 25b Lip part 31 Connection pipe 32 Receiving part 33 Tapered surface 36 Collar 38 Spacer 38a Downstream end surface 38t taper surface in connection pipe insertion direction 39 Inner peripheral surface

Claims (1)

A joint body having a receiving portion for receiving the end portion of the connecting pipe at least at one end portion and forming a tapered surface gradually narrowing toward the upstream side in the connecting tube insertion direction on the inner periphery of the receiving portion. A retaining member in which the outer diameter portion is inscribed in the tapered surface and the inner diameter portion is engaged with the outer peripheral surface of the connecting pipe in order from the receiving portion toward the inner depth of the joint body, and the retaining member. A collar to hold, an elastic member that presses and urges the retaining member together with the collar toward the tapered surface, an annular spacer that holds the downstream end of the elastic member in the connecting pipe insertion direction, and an outer periphery of the connecting pipe The lip packing is formed in a shape having a ring-shaped portion and a lip portion protruding radially inward from the inner periphery of the ring-shaped portion. For plug-in fittings,
The downstream end surface of the spacer in contact with the upstream side in the connecting pipe insertion direction of the ring-shaped part is formed as a tapered surface gradually narrowing toward the downstream side in the connecting pipe insertion direction. Plug-in type pipe joint characterized by

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