JP2020165528A - Pipe joint and piping system - Google Patents

Abstract

To provide a pipe joint which is used together with piping for forming a piping system, the pipe joint being capable of improving chemical resistance or smoothness of an inner surface of the piping system.SOLUTION: A pipe joint T comprises: a joint body 2 in which a socket 5 is provided in an end; and a cylindrical socket member 3 which is disposed inside of the socket 5. The socket member 3 is fixed to the socket 5 by fitting a rugged part 10 which is formed on an inner surface of the socket 5, and a rugged part 20 which is formed on an outer surface of the socket member 3. The socket member 3 is formed from a hard vinyl chloride based resin, an ABS resin, an acryl resin, a PC, a PET or an urethane resin. The joint body 2 is formed from a fluorine-based resin, a PPSU, a PPS or an olefin-based resin. In the pipe joint T, when a pipe H is disposed inside of the socket member 3, a state where a surface of the socket member 3 exposed inside of the pipe joint T is covered by the pipe H is provided.SELECTED DRAWING: Figure 4

Description

The present invention relates to a pipe joint capable of improving the chemical resistance and smoothness of the inner surface of the piping system, and a piping system including the pipe joint.

Patent Document 1 discloses pipe joints used for wastewater equipment, water supply and hot water supply equipment of buildings, and the like. As shown in FIG. 23, the pipe joint 100 of Patent Document 1 has a tubular joint main body 110 and a receiving port 120 provided at an end of the joint main body 110, and a pipe 200 is provided inside the receiving port 120. The end of is inserted. The joint body 110 is made of polypropylene or polyethylene capable of absorbing the thermal stretching stress of the pipe. The receiving port 120 is composed of an inner layer 120a and an outer layer 120b made of different types of resin materials. The inner layer 120a of the socket 120 is formed of vinyl chloride. The end of the pipe 200 is adhesively connected to the inner layer 120a. The outer layer 120b of the receiving port 120 is integrated with the joint body 110, and is made of polypropylene or polyethylene like the joint body 110.

Japanese Unexamined Patent Publication No. 2011-002012

However, in Patent Document 1, when the pipe joint 100 and the pipe 200 are connected to form the pipe system as shown in FIG. 23, the inner layer 120a of the receiving port 110 formed of vinyl chloride is the pipe system. It constitutes the inner surface. Therefore, the chemical resistance and smoothness of the inner surface of the piping system may be lowered.

The present invention has been made in view of the above matters, and an object thereof is a pipe joint used together with a pipe for forming a pipe system, and enhances chemical resistance and smoothness of the inner surface of the pipe system. It is to provide a pipe joint capable of the above, and a piping system including the pipe joint.

In order to achieve the above object, the present invention includes the subjects described in the following sections.

Item 1. A joint body with a socket at the end and
A pipe joint having a tubular receiving member arranged inside the receiving port.
The socket member is fixed to the socket by fitting the concave-convex shape portion formed on the inner surface of the socket and the concave-convex shape portion formed on the outer surface of the socket member.
The socket member is made of a rigid vinyl chloride resin, ABS resin, acrylic resin, PC, PET, or urethane resin.
The joint body is formed of a fluororesin, PPSU, PPS or an olefin resin, and when a pipe is arranged inside the socket member, the surface of the socket member exposed inside the pipe joint is formed. A pipe fitting that is covered with the pipe.

Item 2. The socket is formed as an inner surface on the inner side of the socket, and has an annular step surface extending in the circumferential direction of the pipe joint and an inner surface extending in the axial direction of the pipe joint from the outer peripheral end of the step surface. An annular covering member having a peripheral surface and integrally formed with the joint body protrudes from the inner peripheral end of the stepped surface in the axial direction of the pipe joint.
The receiving member includes a tubular body and an annular wall that projects from one end of the tubular body to the inside of the diameter of the tubular body, and as the outer surface, the outer peripheral surface of the tubular body. , With the outer surface of the annular wall
The concave-convex shape portion formed on the stepped surface of the socket and the concave-convex shape portion formed on the outer surface of the annular wall are fitted, and the concave-convex shape portion formed on the inner peripheral surface of the socket. The socket member is fixed to the socket by fitting with the concave-convex shape portion formed on the outer peripheral surface of the tubular body, and at least a part of the range is formed by the inner surface of the annular wall. The stepped surface of the pipe joint is formed on the outside of the covering member, and the covering member is in a state of protruding from the stepped surface of the pipe joint in the axial direction of the pipe joint.
When the pipe is arranged inside the receiving member so that the tip surface of the pipe abuts on the step surface of the pipe joint, the covering member is between the tip surface of the pipe and the step surface of the pipe joint. Item 2. The pipe fitting according to Item 1, which is covered with a pipe.

Item 3. Item 2. The pipe joint according to Item 1, wherein the coating member is made of a fluorine-based resin, PPSU, PPS or an olefin-based resin.

Item 4. Item 2. The pipe joint according to Item 2 or 3, wherein the covering member has a tapered shape that tapers in the protruding direction.

Item 5. The joint body has an annular elastic member extending in the circumferential direction of the pipe joint.
Item 2. The pipe joint according to any one of Items 2 to 4, wherein the elastic member is arranged on an outer peripheral surface of the covering member.

Item 6. The stepped surface of the pipe joint is composed of an inner surface of the annular wall and a range of the stepped surface of the receiving port located inside the annular wall.
The joint body has an annular elastic member extending in the circumferential direction of the pipe joint.
Item 2. The pipe joint according to any one of Items 2 to 4, wherein the elastic member is arranged in a range of a stepped surface of the receiving port located inside the annular wall.

Item 7. The pipe fitting according to any one of Items 1 to 6 and
It is provided with a pipe arranged inside the receiving member.
The pipe includes at least an outer layer made of a vinyl chloride resin and an inner layer made of a fluorine-based resin, PPSU, PPS, or an olefin-based resin.
By arranging the pipe inside the receiving member so that the tip surface of the pipe abuts on the stepped surface of the pipe joint, the surface of the receiving member exposed inside the pipe joint becomes the pipe. A piping system in which the tip surface of the outer layer of the pipe is covered with the stepped surface, and the outer layer of the pipe and the receiving member are adhesively joined.

Item 8. The pipe fitting according to Item 1 and
It is provided with a pipe arranged inside the receiving member.
The pipe includes a pipe body and a covering member.
The piping body includes at least an outer layer made of a vinyl chloride resin and an inner layer made of a fluorine resin, PPSU, PPS, or an olefin resin.
The coating member is formed of a fluororesin, PPSU, PPS, or an olefin resin, and includes a tubular body and a collar portion protruding outward from the tubular body.
The pipe body and the covering member so that the surface of the receiving member exposed inside the pipe joint is covered with the pipe body and the collar portion, and the tip surface of the pipe is covered with the collar portion. Is arranged inside the receiving member, and the outer layer of the piping main body and the receiving member are adhesively joined to each other.

According to the pipe joint of the present invention, a joint body made of a resin having excellent chemical resistance and smoothness and a receiving member made of a resin having poor chemical resistance and smoothness are provided, and a pipe is arranged inside the receiving member. The surface of the socket member exposed to the inside of the pipe joint is covered with the pipe. As a result, only the surface of the joint body, which is excellent in chemical resistance and smoothness, is exposed inside the pipe joint. Therefore, if the piping system is formed by using the pipe joint of the present invention, the chemical resistance and smoothness of the inner surface of the piping system can be improved.

According to the piping system of the present invention, the inner surface thereof is made of a resin having excellent chemical resistance and smoothness. Therefore, the piping system has high internal chemical resistance and smoothness.

It is a perspective view which shows the pipe joint T which concerns on embodiment of this invention. It is a perspective view which shows the receiving member which a pipe joint includes. It is a perspective view which shows the state which the pipe H is connected to the pipe joint T. It is sectional drawing which shows the state which cut the pipe joint and the pipe along the line AA of FIG. (A) is a view which extracted the cross section of the joint body 2 shown in FIG. 4, and FIG. 5 (b) is a figure which extracted the cross section of the receiving member 3 shown in FIG. It is the figure which extracted the cross section of the pipe joint shown in FIG. (A) is a cross-sectional view showing a state in which a pipe H is connected to a pipe joint T of a modified example of the present invention, and (b) is a view obtained by extracting a cross section of the pipe joint shown in (a). (A) is a cross-sectional view showing a state in which a pipe H is connected to a pipe joint T of a modified example of the present invention, and (b) is a view obtained by extracting a cross section of the pipe joint shown in (a). (A) is a cross-sectional view showing a state in which a pipe H is connected to a pipe joint T of a modified example of the present invention, and (b) is a view obtained by extracting a cross section of the pipe joint shown in (a). It is a schematic perspective view which shows the piping system which concerns on embodiment of this invention. It is sectional drawing which shows the state which the end surface of the outer layer Ha of the pipe H and the end 3a of the receiving member 3 are exposed inside the piping system. It is a perspective view which shows the covering member. It is sectional drawing which shows the piping system of the modification of this invention which is formed when the covering member shown in FIG. 12 is used. It is sectional drawing which shows the piping system of the modification of this invention which is formed when the covering member shown in FIG. 12 is used. It is a perspective view which shows the covering member. It is sectional drawing which shows the piping system of the modification of this invention which is formed when the covering member shown in FIG. 15 is used. It is sectional drawing which shows the piping system of the modification of this invention which is formed when the covering member shown in FIG. 15 is used. It is sectional drawing of the piping system formed by using the pipe joint with a covering member. (A) is a view which extracted the cross section of the joint body 2 shown in FIG. 18, and (b) is a figure which extracted the cross section of the receiving member 3 shown in FIG. It is sectional drawing of the piping system formed by using the pipe joint with a covering member. It is sectional drawing of the piping system formed by using the pipe joint with a covering member. It is sectional drawing of the piping system formed by using the pipe joint with a covering member. It is sectional drawing which shows the conventional piping system.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a perspective view showing a pipe joint T according to an embodiment of the present invention. FIG. 2 is a perspective view showing a receiving member 3 included in the pipe joint T. FIG. 3 is a perspective view showing a state in which the pipe H is connected to the pipe joint T. FIG. 4 is a cross-sectional view showing a state in which the pipe joint T and the pipe H are cut along the line AA of FIG. 3 (when cutting along the line BB of FIG. 3 or in FIG. 3). Even when cutting along the CC line, the pipe joint T and the pipe H have the same cross section as in FIG. 4).

The pipe joint T according to the present embodiment can be connected to a resin pipe H (FIGS. 3 and 4), and together with the pipe H, constitutes a piping system such as a drainage facility or a water supply / hot water supply facility of a building. ..

The pipe joint T has a joint body 2 and a receiving member 3.

The joint main body 2 includes a main pipe 4 and a receiving port 5 connected to the main pipe 4, and the receiving port 5 constitutes an end portion of the joint main body 2.

As shown in FIGS. 2 and 4, the receiving member 3 has a tubular body 30 and an annular wall 31. The annular wall 31 projects from one end of the tubular body 30 inward in the diameter of the tubular body 30, and extends in the circumferential direction of the tubular body 30. As shown in FIGS. 1, 3 and 4, the receiving member 3 is arranged inside the receiving member 5, and as shown in FIG. 4, the annular wall 31 of the receiving member 3 has an annular wall 31. It is arranged on the back side of the socket 5.

As shown in FIGS. 3 and 4, the end portion of the pipe H is inserted into the receiving member 3. By this insertion, the pipe H is connected to the pipe joint T. The inner diameter of the main pipe 4 is substantially equal to the inner diameter of the pipe H (FIG. 4). The outer diameter of the receiving port 5 is made larger than the outer diameter of the main pipe 4. The inner diameter of the receiving port 5 is larger than the inner diameter of the main pipe 4, and is substantially equal to the outer diameter of the receiving port member 3 (outer diameter of the tubular body 30). The inner diameter of the tubular body 30 is substantially equal to the outer diameter of the pipe H.

In the illustrated example, the joint body 2 of the pipe joint T is of the LT type in which the receiving ports 5 are provided at the three ends (the main pipe 4 is composed of the straight portion 4a and the branch portion 4b, and the straight portion The shape of the joint body 2 is not limited to the LT type described above (although the sockets 5 are provided at both ends of 4a and the tip of the branch portion 4b). For example, the joint body 2 may have an L-shape or a linear shape described in JIS K 6739 or the like, or a shape described in JIS K 6734 or the like. Alternatively, the joint body 2 may be a valve socket capable of connecting a steel pipe to a part of the metal socket (for example, a valve socket provided with one metal socket). ). Alternatively, the joint body 2 may be an insertion socket, an exchange socket, or the like that can be connected to the pipe H by a rubber ring.

In the present embodiment, as shown in FIG. 4, the concave-convex shape portion 10 formed on the “inner surface of the socket 5” and the “outer surface of the socket member 3” are provided for the purpose of ensuring water stoppage and maintaining strength. The receiving member 3 is fixed to the receiving port 5 by fitting the uneven shape portion 20 formed in the above.

FIG. 5A is an extracted cross section of the joint body 2 shown in FIG. 4, and FIG. 5B is an extracted cross section of the receiving member 3 shown in FIG.

The above-mentioned "inner surface of the receiving port 5" corresponds to the "stepped surface 50 and the inner peripheral surface 51 of the receiving port 5" shown in FIG. 5 (a). The stepped surface 50 of the receiving port 5 is formed on the back side of the receiving port 5, and exhibits an annular shape extending in the circumferential direction (FIG. 1) of the pipe joint T (the stepped surface 50 of the receiving port 5 is formed). , An annular stepped surface formed by the difference in inner diameter between the receiving port 5 and the main pipe 4). The circumferential direction of the pipe joint T means a direction along the circumference of the tubular body (main pipe 4 and the receiving port 5) constituting the pipe joint T. When the joint body 2 of the pipe joint T is of the LT type as shown in the illustrated example, the circumferential direction of the straight portion 4a of the main pipe 4, the circumferential direction of the receiving port 5 provided at the end of the straight portion 4a, and the main pipe 4 The circumferential direction of the branch portion 4b and the circumferential direction of the receiving port 5 provided at the end of the branch portion 4b correspond to the circumferential direction of the pipe joint T, respectively. The inner peripheral surface 51 of the receiving port 5 extends in the axial direction of the pipe joint T from the outer peripheral end of the stepped surface 50. The axial direction of the pipe joint T means a direction along the central axis of the pipe joint T. When the joint body 2 of the pipe joint T is of the LT type as shown in the illustrated example, the direction along the central axis of the straight portion 4a of the main pipe 4 and the central axis of the socket 5 provided at the end of the straight portion 4a. The direction along the central axis of the branch portion 4b of the main pipe 4, the direction along the central axis of the branch portion 4b, and the direction along the central axis of the receiving port 5 provided at the end of the branch portion 4b correspond to the axial direction of the pipe joint T, respectively.

An uneven shape portion 10a is formed on the stepped surface 50 of the receiving port 5, and an uneven shape portion 10b is formed on the inner peripheral surface 51 of the receiving port 5. The above-mentioned "outer surface of the receiving member 3" corresponds to "the outer surface 32 of the annular wall 31 and the outer peripheral surface 33 of the tubular body 30" shown in FIGS. 2 and 5 (b). An uneven shape portion 20a is formed on the outer surface 32 of the annular wall 31, and an uneven shape portion 20b is formed on the outer peripheral surface 33 of the tubular body 30.

The uneven shape portion 10a of the receiving port 5 and the uneven shape portion 20a of the receiving member 3 are formed by alternately arranging concave portions and convex portions in the radial direction of the pipe joint T (FIGS. 1 and 4). By fitting these uneven shape portions 10a and 20a, the receiving member 3 is fixed in the radial direction. The radial direction of the pipe joint T means the radial direction of the tubular body (main pipe 4 and the receiving port 5) constituting the pipe joint T. When the joint body 2 of the pipe joint T is of the LT type as shown in the illustrated example, the radial direction of the straight portion 4a of the main pipe 4, the radial direction of the socket 5 provided at the end of the straight portion 4a, and the main pipe 4 The radial direction of the branch portion 4b and the radial direction of the receiving port 5 provided at the end of the branch portion 4b correspond to the radial direction of the pipe joint T, respectively. The uneven shape portion 10b of the receiving port 5 and the uneven shape portion 20b of the receiving member 3 are formed by alternately arranging concave portions and convex portions in the axial direction (FIGS. 1 and 4) of the pipe joint T. By fitting these uneven shape portions 10b and 20b, the receiving member 3 is fixed in the axial direction.

According to the fitting of the uneven shape portions 10 and 20 described above, the integrated strength can be maintained between the receiving port 5 and the receiving member 3, and the water blocking property between the receiving port 5 and the receiving member 3 can be maintained. Can be secured. Further, by fitting the uneven shape portions 10a and 20a, the water stopping property can be improved, and the position of the receiving member 3 can be easily aligned when the injection molding described later is performed.

The dimensions and number of the concave portions and the convex portions in the concave-convex shape portions 10 and 20 are not particularly limited, but the concave-convex shape portion 10 and the concave-convex shape portion 20 have at least the strength that the receiving member 3 does not come off due to thermal expansion and contraction. It is necessary to physically fit with.

The joint body 2 is formed of a fluororesin, PPSU (polyphenylsulfone), PPS (polyphenylene sulfide) or an olefin resin. Examples of the olefin resin include polypropylene and polyethylene. According to polypropylene, polyethylene and PPSU, PPS, sufficient chemical resistance can be imparted for general wastewater applications and kitchen wastewater. PVDF or PTFE may be used as the fluororesin for plant applications or when obtaining chemical resistance.

The joint body 2 may be formed by using high molecular weight high-density polyethylene, which is a kind of olefin resin, for the purpose of improving the smoothness of the joint body 2. According to high-molecular-weight high-density polyethylene, the roughness of the inner surface of the joint body 2 can be made lower than that when vinyl chloride is used, and the flowability of wastewater is improved, so that bacteria on the inner surface can propagate. Retention due to solidification of oil can be suppressed. It is expected to be effective in drainage from precision equipment and drainage from medical equipment.

The receiving member 3 is formed of a rigid vinyl chloride resin. As the hard vinyl chloride resin, in addition to a homopolymer of a vinyl chloride monomer, for example, a copolymer of a vinyl chloride monomer and a polymerizable monomer other than the vinyl chloride monomer, a vinyl chloride resin. A graft copolymer or the like in which a vinyl chloride monomer is grafted on a polymer other than the above can be used.

In order to improve the impact resistance, the above-mentioned rigid vinyl chloride resin may contain an ultrafine rubber component. The rubber component of the ultrafine particles may be physically or chemically bonded to the vinyl chloride resin.

Further, the above-mentioned rigid vinyl chloride resin is preferably a chlorinated vinyl chloride resin. If necessary, a polyvinyl chloride resin, a heat stabilizer such as an alkyltin mercapto compound or an alkyltin malate, and a plasticizer such as di-2-ethylhexyl phthalate (DOP) and -2-ethylhexyl adipate (DOA); Lubricants such as polyethylene wax, ester wax, stearic acid, montanic acid wax, calcium stearate; impact resistance enhancer such as acrylic and chlorinated polyethylene; pigment; antistatic agent; flame retardant; calcium carbonate, Inorganic fillers such as talc, clay and mica, processing aids such as methacrylic acid ester resin and the like may be added to the rigid vinyl chloride resin.

In addition to the above-mentioned hard vinyl chloride resin, an adhesive resin such as ABS resin (ABS: Acrylonitrile Butadiene Styrene), acrylic resin, PC (polycarbonate), PET (polyethylene terephthalate), or urethane resin can be used for receiving. The mouth member 3 may be formed.

If the receiving member 3 is formed by using the resin described above, the pipe H can be adhered to the receiving member 3 and the mechanical strength of the receiving member 3 can be increased. On the other hand, the resin used for the above-mentioned receiving member 3 is poor in chemical resistance and smoothness. Therefore, in the pipe joint T of the present embodiment, when the pipe H is arranged inside the receiving member 3, the “surface 34 of the receiving member 3 exposed inside the pipe joint T” is covered with the pipe H. become. Hereinafter, a specific description will be given.

In the pipe joint T of the present embodiment, as shown in FIG. 4, by arranging the receiving member 3 inside the receiving port 5 so that the uneven shape portions 10 and 20 are fitted, as shown in FIG. The inner peripheral surface 34A of the tubular body 30 and the inner surface 34B of the annular wall 31 form the above-mentioned "surface 34 of the receiving member 3 exposed inside the pipe joint T". Further, the inner peripheral surface 35 (FIGS. 2 and 6) of the annular wall 31 is covered by the convex portion 52 (FIGS. 4 to 6) formed at the inner peripheral end of the stepped surface 50 (FIG. 5). .. Then, as shown in FIG. 4, the pipe H is inserted into the receiving member 3 until the tip of the pipe H abuts on the stepped surface (the surface formed by the convex portion 52 and the annular wall 31) of the pipe joint T. As a result, the inner peripheral surface 34A of the tubular body 30 and the inner side surface 34B of the annular wall 31 are covered with the pipe H. As a result, only the surface of the joint body 2 made of a resin (fluororesin, PPSU, PPS or olefin resin) having excellent chemical resistance and smoothness is exposed inside the pipe joint T.

The joint body 2 and the receiving member 3 constituting the pipe joint T described above can be molded by injection molding, respectively. In this case, the pipe joint T including the joint body 2 and the receiving member 3 can be formed by insert molding. In the case of insert molding, the receiving member 3 which has been injection-molded in advance is set in the mold, and then the elastic resin material is injected into the mold to inject-mold the joint body 2.

Further, the pipe joint T can be molded by two-color molding (multicolor molding). In the case of two-color molding (multicolor molding), the joint body 2 and the receiving member 3 are injection-molded at the same time by using a plurality of injection nozzles capable of separately injecting resin into one type of mold. To do.

Alternatively, it is also possible to form the pipe joint T by separately injecting the joint body 2 and the receiving member 3 and fixing them in combination by fitting or forcibly fitting them in a later process. is there.

When the pipe joint T is manufactured by the above-mentioned insert molding or two-color molding (multicolor molding), the uneven shape portion 10 of the joint body 2 and the concave-convex shape portion 20 of the receiving member 3 are heated. It will be glued. Further, when the pipe joint T is manufactured by the above-mentioned fitting or forced fitting, the uneven shape portions 10 and 20 may be bonded with an adhesive. In the case of the above-mentioned insert molding, it is also possible to apply an adhesive to the receiving member 3.

According to the pipe joint T of the present embodiment, the joint main body 2 made of a resin having excellent chemical resistance and smoothness and the receiving member 3 made of a resin having poor chemical resistance and smoothness are provided. By arranging the pipe H inside, the “surface of the receiving member 3 exposed inside the pipe joint T” is covered with the pipe H. As a result, only the surface of the joint body 2 made of a resin (fluororesin, PPSU, PPS or olefin resin) having excellent chemical resistance and smoothness is exposed inside the pipe joint T. Therefore, if the piping system is formed by using the pipe joint T of the present embodiment, the chemical resistance and smoothness of the inner surface of the piping system can be improved.

The structure of the pipe joint T capable of covering the above-mentioned "surface of the receiving member 3" with the pipe H is not limited to the structure shown in FIGS. 1 to 6, and the structure of the pipe joint T is shown in FIGS. 7 to 7. It can be modified as shown in FIG. Hereinafter, a modified example of the pipe joint T shown in FIGS. 7 to 9 will be described.

In the pipe joint T shown in FIG. 7, the annular wall 31 shown in FIGS. 2 and 4 to 6 is not provided on the receiving member 3, and the receiving member 3 is composed of only the tubular body 30. (Fig. 7). In the pipe joint T shown in FIG. 7, the receiving port is fitted so that the uneven shape portion 10b formed on the inner peripheral surface of the receiving port 5 and the uneven shape portion 20b formed on the outer peripheral surface of the tubular body 30 are fitted. By arranging the receiving member 3 inside 5, the inner peripheral surface 34C of the tubular body 30 constitutes the above-mentioned "surface 34 of the receiving member 3 exposed inside the pipe joint T". Become. Then, as shown in FIG. 7A, the pipe H is inserted into the receiving member 3 until the tip of the pipe H hits the stepped surface 50 of the joint body 2, so that the inner circumference of the tubular body 30 is formed. The surface 34C is covered with the pipe H. As a result, only the surface of the joint body 2 made of a resin (fluororesin, PPSU, PPS or olefin resin) having excellent chemical resistance and smoothness is exposed inside the pipe joint T.

In the pipe joint T shown in FIGS. 8 and 9, the annular wall 31 and one end portion 36 of the tubular body 30 are embedded inside the joint body 2, and are within the range of the tubular body 30 excluding the one end portion 36. The peripheral surface 34D constitutes the above-mentioned "surface 34 of the receiving member 3 exposed inside the pipe joint T". Then, the inner peripheral surface 34D of the tubular body 30 is covered by the pipe H by inserting the pipe H into the receiving member 3 until the tip of the pipe H hits the stepped surface 50 of the joint body 2.

In the pipe joint T shown in FIG. 8, one end 36 of the tubular body 30 is embedded inside the joint body 2 from the position X of the stepped surface 50. As a result, in the pipe joint T shown in FIG. 8, at the position X of the stepped surface 50, the resin (fluororesin, PPSU, PPS or olefin resin) of the joint body 2 having excellent chemical resistance and smoothness is the tip of the pipe H. It is in contact with. On the other hand, in the pipe joint T shown in FIG. 9, one end 36 of the tubular body 30 is the joint body 2 from the position Y on the opening side (right side of FIG. 9) of the receiving port 5 with respect to the position X of the stepped surface 50. It is embedded inside (that is, the resin of the joint body 2 exists inside the tubular body 30 between the position X and the position Y). As a result, the pipe joint T shown in FIG. 9 is made of resin (fluoropolymer) of the joint body 2 having excellent chemical resistance and smoothness from the position Y on the opening side of the receiving port 5 to the position X of the step surface 50. Resin, PPSU, PPS or olefin resin) is in contact with the tip of the pipe H.

Next, the piping system according to the embodiment of the present invention will be described. FIG. 10 is a schematic perspective view showing an example of the piping system S according to the embodiment of the present invention.

The piping system S includes the above-mentioned pipe joint T and a pipe H inserted inside the receiving member 3 included in the pipe joint T.

Specifically, the piping system S constitutes a flow path for flowing steam drainage generated by a device M (autoclave or the like) arranged on the ground to a drainage ditch D arranged in the ground. The pipe joint T is provided with pipe joints T1, T2, T3 and T4, and the pipe H is provided with pipes H1, H2, H3 and H4.

The pipe joint T1 includes a joint body 2 which is a valve socket. One end T1a of the pipe joint T1 is a metal receiving port, and a steel pipe K extending from the device M is connected to the one end T1a (metal receiving port). The other end portion T1b of the pipe joint T has a structure similar to that shown in any one of FIGS. 4, 7 to 9, and a pipe is installed inside the receiving member 3 provided in the other end portion T1b. One end of H1 is inserted.

In the pipe joint T2, the joint body 2 exhibits an L shape. One end T2a and the other end T2b of the pipe joint T have a structure similar to that shown in any of FIGS. 4, 7 to 9. The other end of the pipe H1 is inserted into the inside of the receiving member 3 provided at the one end portion T2a. One end of the pipe H2 is inserted into the inside of the receiving member 3 provided at the other end T2b.

In the pipe joint T3, the joint body 2 has a linear shape. One end T3a and the other end T3b of the pipe joint T3 have a structure similar to that shown in any of FIGS. 4, 7 to 9. The other end of the pipe H2 is inserted into the inside of the receiving member 3 provided at the one end portion T3a. One end of the pipe H3 is inserted into the inside of the receiving member 3 provided at the other end T3b.

In the pipe joint T4, the joint body 2 exhibits an L shape. One end T4a and the other end T4b of the pipe joint T4 have a structure similar to that shown in any of FIGS. 4, 7 to 9. The other end of the pipe H3 is inserted into the inside of the receiving member 3 provided at one end T4a. One end of the pipe H4 is inserted into the inside of the receiving member 3 provided at the other end T4b. The other end of the pipe H4 is connected to the drainage ditch D.

The pipes H1, H2, H3, and H4 are provided with an outer layer Ha and an inner layer Hb, similar to those shown in FIGS. 3, 4, 7, and 9, and the outer layer Ha is adhesively joined to the receiving member 3. ..

(Outer layer Ha of piping H)
The outer layer Ha of the pipe H is formed of chlorinated vinyl chloride. The chlorinated vinyl chloride resin may be used alone, or if necessary, a polyvinyl chloride resin, a heat stabilizer such as an alkyltin mercapto compound or an alkyltin malate, and di-2-ethylhexyl phthalate (DOP). , Plasticizers such as -2-ethylhexyl adipate (DOA); Lubricants such as polyethylene wax, ester wax, stearic acid, montanic acid wax, calcium stearate; Impact resistance of acrylic type, chlorinated polyethylene type, etc. Reinforcing agents; pigments; antistatic agents; flame retardants; inorganic fillers such as calcium carbonate, talc, clay and mica, processing aids such as methacrylic acid ester resins and the like may be added to the chlorinated vinyl chloride resin. Further, it is preferable to form the outer layer Ha by using a chlorinated vinyl chloride resin having a chlorine content of 60 to 71% by weight and an average degree of polymerization of chlorinated vinyl chloride of 600 to 1400. When the chlorine content is less than 60% by weight, sufficient heat resistance cannot be obtained. If the chlorine content exceeds 71% by weight, molding may become difficult. The chlorine content is determined by neutralization optimization by the oxygen flask combustion method in accordance with JIS K7229. The thickness of the outer layer Ha is not particularly limited, but it is desirable that the thickness of the outer layer Ha is at least 1 mm or more in consideration of moldability and the like. By making the layer ratio in the pipe thickness direction dominant in vinyl chloride, it is possible to obtain the same ease of handling and workability as general-purpose vinyl chloride pipes. The present invention does not exclude the formation of the outer layer Ha of the pipe H from a resin other than chlorinated vinyl chloride. For example, the outer layer Ha can also be formed from a vinyl chloride resin, a nylon resin, an epoxy resin, an ABS resin, or the like.

If the outer layer Ha of the pipe H is formed by using the resin shown above, the outer layer Ha can be adhered to the receiving member 3.

(Inner layer Hb of piping H)
The inner layer Hb of the pipe H is not particularly limited as long as it is a resin having chemical resistance, but it is preferable to form the inner layer Hb by using an olefin resin such as PP (polypropylene) or PE (polyethylene) which is a general-purpose resin. Further, the inner layer Hb of the pipe H may be formed by using a fluororesin having chemical resistance or a resin such as PPS (polyphenylene sulfide).

For the purpose of improving the smoothness of the inner layer Hb, the inner layer Hb may be formed by using high molecular weight high-density polyethylene which is a kind of olefin resin. According to the high-density high-density polyethylene, the roughness of the inner surface of the inner layer Hb can be further lowered as compared with the case of using vinyl chloride, the flowability of wastewater is improved, the growth of bacteria on the inner surface, and the oil content. It is possible to suppress the retention due to solidification. It is expected to be effective in drainage from precision equipment and drainage from medical equipment. The thickness of the inner layer Hb is not particularly limited.

In the piping system S of the present embodiment, as shown in FIGS. 4, 7 to 9, the piping H is arranged inside the receiving member 3 so that the tip surface of the piping H abuts on the stepped surface of the pipe joint T. At that time, the surface of the receiving member 3 exposed inside the pipe joint T is covered with the pipe H, and the tip surface of the outer layer Ha of the pipe H is covered with the stepped surface of the pipe joint T.

The above-mentioned "stepped surface of the pipe joint T" is an annular stepped surface formed on the back side (main pipe 4 side) of the receiving port 5 and extending in the circumferential direction (FIG. 1) of the pipe joint T. In the example of FIG. 4, the above-mentioned "stepped surface of the pipe joint T" is a surface composed of an inner surface 34B of the annular wall 31 of the receiving member 3 and a tip surface of a convex portion 52 of the joint body 2. In the examples of FIGS. 7 to 9, the above-mentioned "step surface of the pipe joint T" is formed by the step surface 50 of the joint body 2. Then, the outer layer Ha of the pipe H and the receiving member 3 are adhesively joined.

According to the piping system S of the present embodiment described above, the inner surface of the piping system is formed by the joint body 2 made of resin having excellent chemical resistance and smoothness and the inner layer Hb of the piping H. Therefore, the piping system S has high chemical resistance and smoothness on the inner surface.

An adhesive layer may be provided between the outer layer Ha and the inner layer Hb of the pipe H. By doing so, since the inner layer Hb and the outer layer Ha are fixed, the workability is further improved. The material of the adhesive layer is not particularly limited, but a material having sufficient durability against external forces generated by cutting and thermal expansion and contraction during construction is preferable.

(Modification example of piping system)
By the way, when the pipe H is insufficiently inserted or diagonally cut, as shown in FIG. 11, the end face of the outer layer Ha of the pipe H and the end 3a of the receiving member 3 are exposed inside the piping system, and the exposed portion 3a is exposed. The liquid W comes into contact with the resin (hard vinyl chloride resin, ABS resin, acrylic resin, PC, PET, or urethane resin) of the part. Therefore, the progress of deterioration is promoted and water leakage may occur. Therefore, in the present invention, the covering member C shown in FIG. 12 can be used in order to compensate for the insufficient insertion / diagonal cutting of the pipe H.

The covering member C shown in FIG. 12 is formed of a fluororesin, PPSU, PPS, or an olefin resin, and has a tubular body Ca and a collar portion Cb protruding outward from the tubular body Ca. To be equipped with. The collar portion Cb extends around the tubular body Ca and is formed at the center of the width of the tubular body Ca.

13 and 14 show a cross section of a piping system formed when the covering member C (FIG. 12) is used.

The piping system shown in FIGS. 13 and 14 includes the pipe joint T described above and the piping I inserted inside the receiving member 3. The pipe I includes a pipe main body J and the covering member C (FIG. 12).

The pipe body J has a structure similar to that of the pipe H shown in FIGS. 4 and 7 to 9, and has at least an outer layer Ja made of a vinyl chloride resin and a fluorine resin, PPSU, PPS, or olefin resin. It includes an inner layer Jb made of resin.

In the piping system shown in FIG. 13, the covering member is such that the surface 34 of the receiving member 3 exposed inside the pipe joint T is covered with the piping main body J and the tip surface Jc of the piping main body J is covered with the flange portion Cb. C and the pipe body J are arranged inside the receiving member 3. Then, the outer layer Ja of the piping body J and the receiving member 3 are adhesively joined.

In the piping system shown in FIG. 14, of the surface 34 of the receiving member 3 exposed inside the pipe joint T, the surface 34E of the end portion of the receiving member 3 is covered with the flange portion Cb, and the rest of the receiving member 3 The covering member C and the piping body J are arranged inside the receiving member 3 so that the surface 34F of the portion is covered with the piping body J and the tip surface Jc of the piping body J is covered with the flange portion Cb ( The above-mentioned "end of the receiving member 3" is a part of the receiving member 3 extending from the tip of the piping body J due to insufficient insertion or diagonal cutting of the piping body J). Then, the outer layer Ja of the piping body J and the remaining portion of the above-mentioned receiving member 3 are adhesively joined.

According to the piping system shown in FIGS. 13 and 14, in a situation where the piping body J is insufficiently inserted or diagonally cut, the inner surface of the piping system is covered with the inner layer of the joint body 2 and the piping body J having excellent chemical resistance and smoothness. It can be composed of Ja and a covering member C. Therefore, the inner surface of the piping system has high chemical resistance and smoothness.

Further, the covering member D shown in FIG. 15 may be used instead of the covering member C shown in FIGS. 12 to 14.

The covering member D shown in FIG. 15 includes a tubular body Da and a flange portion Db protruding outward from the tubular body Da. The collar portion Db extends around the tubular body Da and is formed at one end of the width of the tubular body Da. The coating member D is also formed of a fluororesin, PPSU, PPS, or an olefin resin, like the coating member C (FIG. 12).

16 and 17 show a cross section of a piping system formed when the covering member D (FIG. 15) is used.

In the piping system shown in FIG. 16, the covering member is covered so that the surface 34 of the receiving member 3 exposed inside the pipe joint T is covered with the piping main body J and the tip surface Jc of the piping main body J is covered with the flange portion Db. D and the piping body J are arranged inside the receiving member 3. Then, the outer layer Ja of the piping body J and the receiving member 3 are adhesively joined.

In the piping system shown in FIG. 17, of the surface 34 of the receiving member 3 exposed inside the pipe joint T, the surface 34G of the end portion of the receiving member 3 is covered with the flange portion Db of the covering member D, and the rest. The covering member D and the piping body J are inside the receiving member 3 so that the surface 34H of the portion of the receiving member 3 is covered with the piping body J and the tip surface Jc of the piping body J is covered with the flange portion Db. (The above-mentioned "end of the receiving member 3" is a part of the receiving member 3 extending from the tip of the piping body J due to insufficient insertion or diagonal cutting of the piping body J). Then, the outer layer Ja of the piping body J and the receiving member 3 are adhesively joined.

According to the piping system shown in FIGS. 16 and 17, when the piping body J is insufficiently inserted or diagonally cut, the inner surface of the piping system is formed on the inner layer of the joint body 2 and the piping body J having excellent chemical resistance and smoothness. It can be composed of Ja and a covering member D. Therefore, the inner surface of the piping system has high chemical resistance and smoothness.

The covering member C (FIGS. 12 to 14) and the covering member D (FIGS. 15 to 17) may be fixed to the piping body J or the joint body 2 in advance by adhesion or the like, but the covering member is not necessarily the covering member. It is not necessary to fix C and D to the piping body J or the joint body 2.

Further, in the pipe joints shown in FIGS. 13, 14, 16 and 17, the covering members C and D are separate members from the joint body 2, but as shown in FIG. 18, the pipe joint is a joint body. It can be changed to include a covering member E integrally molded with 2. Hereinafter, the pipe joint T of the modified example shown in FIG. 18 will be described.

FIG. 18 is a cross-sectional view of a piping system formed by using a pipe joint T with a covering member E. FIG. 19A is an extracted cross section of the joint body 2 shown in FIG. 18, and FIG. 19B is an extracted cross section of the receiving member 3 shown in FIG.

In the pipe joint T shown in FIG. 18, the concave-convex shape portion 10a is formed on the annular stepped surface 50 (FIG. 19A) formed on the back side of the receiving port 5. Further, a concave-convex shape portion 10b is formed on the inner peripheral surface 51 of the receiving port 5 extending in the axial direction of the pipe joint T from the outer peripheral end of the stepped surface 50. Then, the covering member E integrally formed with the joint body 2 projects from the inner peripheral end of the stepped surface 50 of the receiving port 5 in the axial direction of the pipe joint T. The covering member E exhibits an annular shape extending in the circumferential direction (see FIG. 1) of the pipe joint T, and is formed of a fluorine-based resin, PPSU, PPS, or an olefin-based resin.

The receiving member 3 includes a tubular body 30 and an annular wall 31 protruding inward in the diameter of the tubular body 30 from one end of the tubular body 30, similar to those shown in FIGS. 4 to 6. .. An uneven shape portion 20a is formed on the outer surface 32 (FIG. 19B) of the annular wall 31. An uneven shape portion 20b is formed on the outer peripheral surface 33 of the tubular body 30.

In the pipe joint T described above, the concave-convex shape portion 10a and the concave-convex shape portion 20a are fitted, and the concave-convex shape portion 10b and the concave-convex shape portion 20b are fitted, so that the receiving member 3 is fixed to the receiving port 5. At the same time, the stepped surface Ta of the pipe joint T is formed on the outside of the covering member E, and the covering member E is in a state of protruding from the stepped surface Ta in the axial direction of the pipe joint T. The stepped surface Ta of the pipe joint T is a stepped surface formed by at least a part of the inner surface 34B of the annular wall 31. In the illustrated example, the stepped surface Ta of the pipe joint T is composed of an inner side surface 34B of the annular wall 31 and a range 50a of the stepped surface 50 of the receiving port 5 extending inward of the annular wall 31. The entire stepped surface Ta of the pipe joint T may be composed of the inner surface 34B of the annular wall 31 (that is, the inner surface 34B of the annular wall 31 may extend to the position of the base end of the covering member E. ).

Then, as shown in FIG. 18, when the pipe H is arranged inside the receiving member 3 so that the tip surface of the pipe H abuts on the stepped surface Ta of the pipe joint T, “the tip surface of the pipe H and the pipe joint T The "between P with the step surface Ta" is covered by the covering member E. The pipe H is provided with an outer layer Ha and an inner layer Hb, similar to those shown in FIGS. 3, 4, 7, and 9, and the outer layer Ha of the pipe H is adhesively joined to the receiving member 3.

According to the pipe joint T shown in FIG. 18, the covering member E can prevent the liquid W from entering the above-mentioned “P between the tip surface of the pipe H and the stepped surface Ta of the pipe joint T”. Therefore, it is possible to prevent the liquid W from coming into contact with the end surface of the outer layer Ha of the piping H or the inner surface of the receiving member 3, so that the chemical resistance and smoothness of the piping system can be improved.

Further, since the covering member E is integrally formed with the joint body 2, the covering member may be removed due to forgetting to insert the covering member during production or construction, as in the case where the covering member is a separate member from the joint body 2. The situation where the liquid W is flown into the piping system does not occur in the non-existent situation. Therefore, it is possible to reliably prevent the liquid W from coming into contact with the end surface of the outer layer Ha of the pipe H or the inner surface of the receiving member 3.

As shown in FIG. 20, the covering member E may have a tapered shape that tapers in the protruding direction (the above protruding direction corresponds to the axial direction of the pipe joint T). By doing so, the degree of adhesion between the inner peripheral surface Hd of the pipe H and the outer peripheral surface Ea of the covering member E becomes high at the time of construction, so that the water stopping property of the liquid W can be improved. In order to increase the degree of adhesion, as shown in FIG. 20, it is preferable to incline the outer peripheral surface Ea of the covering member E so that the outer diameter of the covering member E becomes smaller toward the tip end side of the covering member E. ..

Further, in order to improve the water stopping property of the liquid W, as shown in FIGS. 21 and 22, the joint body 2 may have an annular elastic member D. The elastic member D extends in the circumferential direction (see FIG. 1) of the pipe joint T. In the example shown in FIG. 21, the elastic member D is arranged on the outer peripheral surface Ea of the covering member E. In the example shown in FIG. 22, the elastic member D is arranged in the "range 50a of the stepped surface 50 of the receiving port 5" located inside the annular wall 31. The "range 50a of the stepped surface 50 of the receiving port 5" constitutes the stepped surface Ta of the pipe joint T together with the "inner side surface 31a of the annular wall 31" (the stepped surface 50 of the receiving port 5 is shown in FIG. 19). See (A)).

The material of the elastic member D is preferably NBR (nitrile rubber), FKM (fluorine rubber), EPDM (ethylene butadiene rubber), or a rubber material having elasticity equivalent thereto, but any elastic member capable of sufficiently stopping water. Not specified. The elastic member D is fixed to the joint body 2 by being arranged in a recess formed in the outer peripheral surface Ea of the covering member E or the range 50a of the stepped surface 50, for example. In this case, a part of the elastic member D protrudes from the above-mentioned recess and comes into contact with the pipe H. Further, the elastic member D may be adhered to the outer peripheral surface Ea of the covering member E or the range 50a of the stepped surface 50 by using an adhesive.

According to the examples shown in FIGS. 21 and 22 described above, the water stopping property can be improved by generating a surface pressure due to the deformation of the elastic member D by the pipe H during construction.

The elastic member D is preferably a ring (o-ring) having a circular cross-sectional shape as shown in FIGS. 21 and 22, but if water stoppage by surface pressure can be sufficiently realized, the elastic member D has a cross section. The shape may be a triangular or quadrangular ring.

The number of pipe joints T and pipes H constituting the above-mentioned piping system S of the present invention, the type of pipe joint T, and the like are not limited to those shown above. That is, the number of pipe joints T and pipes T constituting the piping system S can be any number of 1 or more, and the joint body 2 is LT-shaped or L-shaped in order to form the piping system S. -A pipe joint T such as a straight type, a valve socket, a plug-in socket, and an exchange socket can be used.

2 Joint body 3 Receptacle member 5 Receptacles 10, 10a, 10b Concavo-convex shape part formed on the inner surface of the socket 20, 20a, 20b Concavo-convex shape portion formed on the outer surface of the socket member 30 Cylindrical body 31 Circular wall 32 Outer surface of the annular wall 33 Outer surface of the tubular body 34B Inner surface of the annular wall 50 Stepped surface of the socket 50a Range of the stepped surface of the socket located inside the annular wall 51 Inner peripheral surface of the socket 34 Pipe fitting Surface of receiving member exposed to the inside of C, D, E Coating member Ea Outer surface of coating member T, T1, T2, T3, T4 Pipe fitting H, H1, H2, H3, H4, I Piping Ha Pipe outer layer Hb Inner layer of piping J Piping body Ja Outer layer of piping body Jb Inner layer of piping system S Piping system T Pipe joint Ta Step surface of pipe joint

Claims (8)

A joint body with a socket at the end and
A pipe joint having a tubular receiving member arranged inside the receiving port.
The socket member is fixed to the socket by fitting the concave-convex shape portion formed on the inner surface of the socket and the concave-convex shape portion formed on the outer surface of the socket member.
The socket member is made of a rigid vinyl chloride resin, ABS resin, acrylic resin, PC, PET, or urethane resin.
The joint body is formed of a fluororesin, PPSU, PPS or an olefin resin, and when a pipe is arranged inside the socket member, the surface of the socket member exposed inside the pipe joint is formed. A pipe fitting that is covered with the pipe. The socket is formed as an inner surface on the inner side of the socket, and has an annular step surface extending in the circumferential direction of the pipe joint and an inner surface extending in the axial direction of the pipe joint from the outer peripheral end of the step surface. An annular covering member having a peripheral surface and integrally formed with the joint body protrudes from the inner peripheral end of the stepped surface in the axial direction of the pipe joint.
The receiving member includes a tubular body and an annular wall that projects from one end of the tubular body to the inside of the diameter of the tubular body, and as the outer surface, the outer peripheral surface of the tubular body. , With the outer surface of the annular wall
The concave-convex shape portion formed on the stepped surface of the socket and the concave-convex shape portion formed on the outer surface of the annular wall are fitted, and the concave-convex shape portion formed on the inner peripheral surface of the socket. The socket member is fixed to the socket by fitting with the concave-convex shape portion formed on the outer peripheral surface of the tubular body, and at least a part of the range is formed by the inner surface of the annular wall. The stepped surface of the pipe joint is formed on the outside of the covering member, and the covering member is in a state of protruding from the stepped surface of the pipe joint in the axial direction of the pipe joint.
When the pipe is arranged inside the receiving member so that the tip surface of the pipe abuts on the step surface of the pipe joint, the covering member is between the tip surface of the pipe and the step surface of the pipe joint. The pipe fitting according to claim 1, which is covered with a pipe. The pipe joint according to claim 1, wherein the coating member is made of a fluororesin, PPSU, PPS or an olefin resin. The pipe joint according to claim 2 or 3, wherein the covering member has a tapered shape that tapers in the protruding direction. The joint body has an annular elastic member extending in the circumferential direction of the pipe joint.
The pipe joint according to any one of claims 2 to 4, wherein the elastic member is arranged on an outer peripheral surface of the covering member. The stepped surface of the pipe joint is composed of an inner surface of the annular wall and a range of the stepped surface of the receiving port located inside the annular wall.
The joint body has an annular elastic member extending in the circumferential direction of the pipe joint.
The pipe joint according to any one of claims 2 to 4, wherein the elastic member is arranged in a range of a stepped surface of the receiving port located inside the annular wall. The pipe fitting according to any one of claims 1 to 6 and
It is provided with a pipe arranged inside the receiving member.
The pipe includes at least an outer layer made of a vinyl chloride resin and an inner layer made of a fluorine-based resin, PPSU, PPS, or an olefin-based resin.
By arranging the pipe inside the receiving member so that the tip surface of the pipe abuts on the stepped surface of the pipe joint, the surface of the receiving member exposed inside the pipe joint becomes the pipe. A piping system in which the tip surface of the outer layer of the pipe is covered with the stepped surface, and the outer layer of the pipe and the receiving member are adhesively joined. The pipe fitting according to claim 1 and
It is provided with a pipe arranged inside the receiving member.
The pipe includes a pipe body and a covering member.
The piping body includes at least an outer layer made of a vinyl chloride resin and an inner layer made of a fluorine resin, PPSU, PPS, or an olefin resin.
The coating member is formed of a fluororesin, PPSU, PPS, or an olefin resin, and includes a tubular body and a collar portion protruding outward from the tubular body.
The pipe body and the covering member so that the surface of the receiving member exposed inside the pipe joint is covered with the pipe body and the collar portion, and the tip surface of the pipe is covered with the collar portion. Is arranged inside the receiving member, and the outer layer of the piping main body and the receiving member are adhesively joined to each other.