JP2009156469A - Pipe joint and pipe holding collet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a part highly resistant to an impact to a water hammer by reducing the number of parts constituting a pipe joint, in the pipe joint used for supplying water and hot water. <P>SOLUTION: This pipe joint is formed by fitting an O-ring and a pipe holding collet to a socket for constituting a diametrical expanding part for allowing the insertion of a pipe from a deep part in its diametrical expanding part. The pipe holding collect is composed of a resin cylindrical body, a plurality of metallic claws having bases embedded in a cylinder and having the tip projected inside the cylinder, and a plurality of slits formed by sandwiching the metallic claws from one side of the cylindrical body. The deep part side of the slits in the cylindrical body continues in the circumferential direction, and the claws are arranged in independent divided pieces of the slits in the cylindrical body, and fitted in the diametrical expanding part with the slit side of the pipe holding collect as the shallow part side. In the figure, the pipe holding collet is 1, the cylindrical body is 2, the slit is 2a, inclined faces are 2b and 2c, the metallic claw is 3, the base is 3a, the claw is 3b, and a lip is 3c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe joint, and more particularly to a one-push type pipe joint.

  As a pipe joint used for connecting resin pipes that are required to withstand a certain pressure such as water pressure, a one-push joint as shown in FIG. 11 is widely used. This is because in a metal or synthetic resin socket 32 into which a pipe 31 is inserted, a pipe holding ring 35, a backup ring 36, and an O-ring 34 are sequentially inserted into the enlarged diameter portion 33 from the deep portion. The cap 38 that is screwed into the portion 37 is prevented from coming out.

  In such a pipe joint, the O ring 34, the backup ring 36, and the pipe holding ring 35 are pressed by screwing a cap 38 into the socket 32, and a pipe 31 having a sleeve 39 fitted at the tip thereof is inserted therein. Is to be inserted. That is, the outer peripheral surface of the pipe 31 is inserted while being in contact with the O-ring 34, and further inserted into the socket 32 under the elastic deformation in the expanding direction of each claw 35 a of the pipe holding ring 35. Pulling out the claw 35a prevents the pipe 31 from coming out. Normally, the cap 38 is covered with a film cover, and it is determined whether or not the cap 38 has been loosened thereafter.

  However, it is necessary to fit the pipe retaining ring, backup ring, O-ring, etc. in the socket so that the order is correct, and if this is wrong, the pipe cannot be inserted or even if it is inserted, the connection is sufficient. The occurrence of water leakage is unavoidable. In the relationship between the pipe holding ring 35 and the pipe 31, the claw 35 a often forms a flaw on the outer periphery of the pipe 31, that is, a streak-like flaw in the longitudinal direction of the pipe 31. Even if it is sealed, water may leak from such streaks. Therefore, in a normal socket, a pipe holding ring is arranged at the deepest part and an O-ring is arranged at a shallower part. However, since the pipe is inserted in contact with the O-ring, in some cases, the contact resistance often gives the illusion that the pipe has been inserted. In this case, since the claw of the pipe holding ring does not bite into the outer periphery of the pipe, it is inevitable that water leaks during use. For this reason, it goes without saying that it is desirable that the number of parts constituting the pipe joint be small.

  In addition, there are cases where single levers with high operability are widely used in domestic faucets, and the water pressure is increased so that water can be obtained directly from the water mains in order to provide fresh drinking water. is there. Therefore, there is a tendency that the water hammer generated when opening and closing the faucet is elevated. Therefore, it is not necessary to make the structure with high impact resistance against the water hammer that is generated when the water faucet is opened / closed. must not.

  The present invention relates to a pipe joint used for water supply and hot water supply, which reduces the number of parts constituting the pipe joint and provides high impact resistance parts for water hammers and the like. A collet for holding a pipe used for a push-type pipe joint is provided.

  A first aspect of the present invention relates to a pipe joint, which is a socket having a diameter-enlarged portion that allows insertion of a pipe, and a pipe joint in which an O-ring and a pipe-holding collet are fitted in the enlarged-diameter portion. The pipe holding collet includes a resin cylindrical body, a pipe holding body in which a base portion is embedded in the cylindrical body and a claw portion protruding inside the cylindrical body, and a claw portion of the pipe holding body from one side of the cylindrical body. It is composed of a plurality of slits that are sandwiched, and the deep side of the slit in the cylindrical body is continuous in the circumferential direction, and a claw portion is provided for each independent split piece of the slit in the cylindrical body, The pipe holding collet is fitted into the enlarged diameter portion with the slit side being a shallow portion side.

  More specifically, it is preferable to prevent the pipe holding collet and the O-ring from coming off with a cap screwed into a threaded portion engraved in the socket, and particularly preferably, the outer surface on the slit side of the pipe holding collet. Is a pipe joint in which an inclined surface covering the slit side outer surface on the cap side is formed corresponding to the inclined surface.

  According to a second aspect of the present invention, there is provided a pipe holding collet that is disposed in a pipe joint and holds an outer surface of a water supply / hot water supply pipe, wherein a resin cylinder and a base are embedded in the cylinder. And a plurality of slits formed on both sides of the claw portion of the pipe holding body from one side of the cylindrical body, and a deep portion of the slit in the cylindrical body The sides are continuous in the circumferential direction, and claw portions are respectively provided on the independent split pieces of the slits in the cylindrical body. Preferably, the outer surface on the slit side of the cylindrical body is inclined so as to be advantageous when incorporated into a pipe joint.

  As a resin material constituting such a pipe holding collet, polyphenylsulfone, polyethersulfone, or polyphenylene sulfide is preferably used, and a metal claw portion embedded in the resin material is preferably made of stainless steel.

  As described above, the present invention adopts a pipe holding collet having a special shape, so that the number of parts constituting the pipe joint can be reduced, and the work for assembling can be saved and work errors can be greatly reduced. became. The resin used for the pipe holding collet is selected with a resin having extremely high impact strength, and can withstand this even when a larger water hammer occurs. This is what we can do.

FIG. 1 is a front view of a pipe holding collet according to the present invention. 2 is a side view of the pipe holding collet of FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is an enlarged view of FIG. FIG. 5 is a partial cutaway view of a pipe joint using the pipe holding collet shown in FIGS. FIG. 6 is a partially cut view in which a resin pipe is inserted into the pipe joint of FIG. FIG. 7 is a partially cutaway view of a pipe joint using another pipe holding collet. FIG. 8 is a partially enlarged cross-sectional view showing another example of the pipe holding collet of the present invention. FIG. 9 is a development view showing an example of a pipe holder used in the pipe holding collet of the present invention and an enlarged sectional view of each part. FIG. 10 is an enlarged front view of still another example of the pipe holding collet of the present invention. FIG. 11 is a partial cutaway view of a conventional pipe joint.

  The pipe-holding collet used for the joint that connects the conventional resin pipes for water supply and hot water supply uses materials such as polyethylene and polysulfone. Polyethylene is inferior in heat resistance and dimensional stability (use However, the heat resistance and impact resistance of polysulfone have no problem when used for conventional water supply (Izod impact strength with notch: 69 J / m).

  However, in consideration of the case where high pressure water supply is advanced in the future, polyphenylsulfone is preferably used in the present invention (notched Izod impact strength: 690 J / m). Unlike polysulfone, polyphenylsulfone is highly safe because it does not use bisphenol A as a raw material. The resin used for the pipe holding collet of the present invention may be polyethersulfone or polyphenylene sulfide having performance equivalent to or higher than that of polysulfone such as notched Izod impact strength.

  If it further mentions about the shape of the collet for pipe holding, the claw part of a pipe holder will protrude in the middle of a slit. For this reason, when the insertion of the resin pipe into the socket is insufficient and the O-ring is not reached, the fluid inside can pass through the slit and flow out to the outside, so that water leakage can be detected early. The completeness of the resin pipe insertion can be easily confirmed.

  As for the pipe holder, it may be provided with one base and one claw, or a plurality of pipes, or may be endless (annular) depending on the case. May be. The pipe holder may be made of metal or plastic, but is usually made of metal, and in order to embed the pipe holder in the resin, a metal plate is previously pressed on the base and the claw. The lip formed and supported on the base side is set at a predetermined position in a mold for injecting resin, and filled with the resin, and is formed by cutting the lip after molding.

  Further referring to the pipe holder, the claw portion protruding from the inner surface of the cylindrical body should preferably be a long body perpendicular to the inner peripheral radial direction of the cylindrical body, that is, the axial direction of the cylindrical body, and It is good to project concentrically with the cylindrical body. Thereby, the biting into the outer surface of the pipe to be inserted is bitten almost uniformly in the radial direction. In addition, it is preferable that both sides of the claw portion are not exposed from the peripheral surface of the cylindrical body so as not to form a sharp edge. For example, a resin protrusion protruding from the cylindrical body is formed on both sides of the claw portion to form the edge. It is also a good method to embed both sides of the claw portion in the resin protrusion. Such a resin protrusion is normally set to a protrusion amount substantially the same as the protrusion amount (height) of the claw portion.

  The reason for this is that when the edges are formed on both sides of the claw portion, the outer surface is damaged depending on the properties of the inserted pipe. Therefore, both ends of the claw portion may be receded in a straight line or a curved line toward the cylindrical body without exposing both ends from the circumferential surface of the cylindrical body, and in some cases, both sides are embedded in the cylindrical body. The claw portion is not concentric with the circumferential surface of the cylindrical body, and it is possible to make the radius of curvature slightly larger or make it linear. Also in this case, it is preferable that both sides of the claw portion do not constitute the above-described relationship, that is, the edge with the cylindrical body. The slit can be deeper than any depth of the claw portion and the base portion, but in some cases, the slit may only reach the depth of the claw portion.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
1 is a front view of a collet 1 for holding a pipe according to the present invention, FIG. 2 is a side view, and FIG. 3 is a cross-sectional view taken along line AA. FIG. 4 is an enlarged view of FIG. The used resin constitutes the cylindrical body 2 with polyphenylsulfone, and the tip side of the slit 2a is slightly tapered (thin). That is, in this example, the inclined surfaces 2 b and 2 c are formed inside and outside the cylindrical body 2. The inner diameter of the cylindrical body 2 is preferably 0 to +1.0 mm with respect to the pipe outer diameter, the outer diameter is preferably about +3.5 to 6.0 mm with respect to the pipe outer diameter, the length is 7 to 9 mm, and the slit depth. Is preferably about 5 to 7 mm.

  An outline of an example of the manufacturing method of the pipe holding collet 1 is as follows. A stainless steel pipe holding body 3 having a base 3a and a claw 3b and having a lip 3c is set in a mold (not shown). The mold is filled with polyphenylsulfone to produce a pipe holding collet 1. The claw portion 3b protrudes slightly from the inner surface of the collet 1, and its tip 3b is formed concentrically with the inner surface of the cylinder, and the tip 3b is long in the direction of the inner circumference of the cylinder. I am making a body. The claw portion 3b is disposed between the slits 2a, and cuts the lip 3c protruding outward after the resin is filled to leave the base portion 3a in the cylindrical body 2. In this example, the pipe holder 3 is composed of one base 3a and one claw 3b, and the adjacent pipe holders 3 have independent configurations. The lip 3c may have a structure extending straight from the base 3a.

  FIG. 5 is a cutaway view of a pipe joint 10 using the above-described collet 1 for holding a pipe. Reference numeral 11 denotes a socket, which is formed with an enlarged diameter portion 13 together with a male screw 12. The O-ring 14 and the pipe holding collet 1 are sequentially inserted into the enlarged diameter portion 13 from the deep side. The pipe holding collet 1 is fitted with the slit 2a side facing the shallow portion. For this reason, the nail | claw part 1 will protrude diagonally toward the deep part side. Reference numeral 15 denotes a resin cap screwed into the male screw 12, and the tip of the cap 15 faces the tip of the pipe holding collet 1 on the slit 2 a side. Is formed with an inclined surface 15a corresponding to the inclined surface 2b. If the relationship between the cap 15 and the socket 10 is further described, although not shown, a similar effect can be obtained by engraving a female screw in the enlarged diameter portion of the socket and screwing the male screw formed on the cap. .

  FIG. 6 is a view in which a resin pipe 20 is inserted into the pipe joint 10 shown in FIG. Reference numeral 20 denotes a resin pipe, and a metal collar 21 is fitted at the tip, and this is inserted into the socket 11. At this time, it is necessary to insert the resin pipe 20 until it hits the deepest portion of the enlarged diameter portion 13 of the socket 11. By doing so, the claw portion 3b bites into the outer surface of the resin pipe 20, and is further sealed by the O-ring 14 to prevent leakage of internal fluid. When the fluid flows inside and pressure is applied to the resin pipe, the resin pipe tends to retreat slightly due to the pressure, but the pipe holding collet 1 also moves slightly with the claw portion 3b biting in. become. At this time, the inclined surface 2b of the cylindrical body 2 and the inclined surface 15a of the cap 15 are in contact with each other, and the resin portion where the claw portion 3b is formed due to the presence of the slit 2a is further bent inward so that the claw portion 3b is greatly bite. Thus, the so-called self-sealing is performed, and the resin pipe 10 is prevented from coming off and water leakage of the internal fluid is completely prevented.

  When the insertion of the resin pipe 20 is insufficient, that is, when the resin pipe 20 reaches the claw portion 3b but does not reach the O-ring 14, the insertion is completed by the claw portion 3b biting in once. Although it may feel like this, if construction is completed in this state, water leakage will eventually occur. In the present invention, since the slit 2a exists to the inner side of the position of the claw portion 3b, the internal fluid easily leaks through the slit 2a, and the lack of insertion can be easily detected by a hydraulic pressure test. It becomes.

  FIG. 7 is a partially cutaway view of a pipe joint using another pipe holding collet. In this example, an inclined surface 2b is formed on the outer side of the cylindrical body 2, and an inwardly inclined surface facing the inclined surface 2b is fitted to the cylindrical cap 15 and the enlarged diameter portion 13 of the socket 11. 15a is formed. In this example, the front end of the collar 21 fitted to the front end of the pipe 20 is inclined inward so that it can be easily inserted into the socket. Now, when the pipe 20 is fitted and then the pressure of the fluid is applied, the pipe 20 is slightly retracted, but the inclined surface 2b of the cylindrical body 2 and the inclined surface 15a of the cap 15 are the same as in the case of FIG. And the portion of the resin in which the claw portion 3b is formed due to the presence of the slit 2a is bent further inward, and the claw portion 3b is greatly bitten, so-called self-sealing, and the resin pipe 10 is prevented from coming off here. Thus, leakage of the internal fluid is completely prevented.

  FIG. 8 is a partially enlarged front view showing a second example of the pipe holding collet according to the present invention, in which resin protrusions 1a protruding from the cylindrical body are formed on both sides of the claw part 3b. Due to the presence of this, sharp edges are not formed by both sides of the claw portion 2b. The protrusion 1a is substantially the same as the height of the claw 2b. And although not shown, it is a means that can embed both sides of the claw portion 2b in the protruding portion 1a.

  FIG. 9 is a development view showing another example of the pipe holder 3 used in the pipe holding collet of the present invention and an enlarged cross-sectional view of each part. The base part 3a is continuous and only the claw part 3b is partitioned. It has a formed structure. In this example, it is possible to set in the mold without forming the lip 3c, and simplification in the manufacturing process can be achieved.

  FIG. 10 is an enlarged front view showing still another example of the pipe holding collet 1 according to the present invention. The overall structure is substantially the same as that shown in the example of FIG. 1, and the claw portion 3b is linear. The both ends are embedded in the cylindrical body 2 and avoid forming an edge.

1. Collet for holding pipes
2 Cylindrical body
2a ... slit,
2b, 2c ... inclined surface,
3. Pipe holder,
3a ... the base of the pipe holder,
3b ... Claw part of pipe holder
3c ... Lip of pipe holder
10. Pipe joint,
11. Socket,
12. Male thread,
13 ... Diameter expansion part,
14 O-ring,
15 ... Resin cap,
15a ... inclined surface,
20. Resin pipe,
21 ... Metal collar.

Claims (20)

A socket comprising a diameter-enlarged portion that allows insertion of a pipe, and a pipe joint in which an O-ring and a pipe-holding collet are fitted in the enlarged-diameter portion,
The pipe holding collet includes a resin cylindrical body, a pipe holding body in which a base portion is embedded in the cylindrical body and a claw portion protruding inside the cylindrical body, and a claw portion of the pipe holding body sandwiched from one side of the cylindrical body. And the slits in the cylindrical body are continuous in the circumferential direction, and the claw portions are provided in the independent split pieces of the slits in the cylindrical body, respectively.
A pipe joint characterized in that the pipe holding collet is fitted in the enlarged diameter portion with the slit side being a shallow portion side.   2. The pipe joint according to claim 1, wherein a cap for retaining the pipe and an O-ring are prevented from coming off by a cap screwed into a threaded portion engraved in the socket.   The pipe joint according to claim 1, wherein an outer surface on the slit side of the collet for holding a pipe is an inclined surface.   The pipe joint according to claim 1, wherein an inclined surface is formed on the cap to cover an outer surface on the slit side of the pipe holding collet. A pipe-holding collet that is arranged in a pipe joint and holds the outer surface of a water supply / hot water supply pipe,
A resin cylinder, a pipe holder with a base embedded in the cylinder and a claw at the tip projecting inside the cylinder, and a plurality formed by sandwiching the claw of the pipe holder from one side of the cylinder A pipe holding, characterized in that the deep side of the slit in the cylindrical body is continuous in the circumferential direction, and a claw portion is provided on each of the independent split pieces of the slit in the cylindrical body. Collet.   The collet for holding a pipe according to claim 5, wherein an outer surface on the slit side of the cylindrical body is an inclined surface.   6. The collet for holding a pipe according to claim 5, wherein the claw portion of the pipe holder protrudes in a long and narrow shape in the circumferential direction of the cylindrical body.   6. The collet for holding a pipe according to claim 5, wherein the claw portion of the pipe holder protrudes concentrically with the cylindrical body.   6. The collet for holding a pipe according to claim 5, wherein protrusions substantially the same as the protruding height of the claw part are formed on both sides of the claw part of the pipe holder from the inside of the cylindrical body.   The pipe holding collet according to claim 8, wherein both sides of the claw portion of the pipe holder are embedded in the protrusion.   6. The pipe holding collet according to claim 5, wherein both sides of the claw portion of the pipe holding body are configured to recede toward the circumferential surface of the cylindrical body.   6. The pipe holding collet according to claim 5, wherein both sides of the claw portion of the pipe holding body are embedded in a cylindrical body.   6. The collet for holding a pipe according to claim 5, wherein the depth of the slit is the depth reaching the depth of the claw and base of the pipe holder.   6. The collet for holding a pipe according to claim 5, wherein the slit has a depth that does not reach the base of the pipe holder.   6. The collet for holding a pipe according to claim 5, wherein a base and a claw are respectively formed on the pipe holder.   6. The collet for holding a pipe according to claim 5, wherein the base of the pipe holder is continuous in the circumferential direction of the cylindrical body.   6. The pipe holding collet according to claim 5, wherein the resin constituting the cylindrical body is polyphenylsulfone.   6. The pipe holding collet according to claim 5, wherein the resin constituting the cylindrical body is polyethersulfone.   6. The pipe holding collet according to claim 5, wherein the resin constituting the cylindrical body is polyphenylene sulfide.   The pipe holding collet according to claim 5, wherein the pipe holding body embedded in the resin constituting the cylindrical body is made of stainless steel.

Images